SiriusPoint (SPNT) 10-K 24 Feb 23 2022 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Feb. 20, 2023	Jun. 30, 2022
Entity Listings [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-36052
Entity Registrant Name	SIRIUSPOINT LTD.
Entity Incorporation, State or Country Code	D0
Entity Tax Identification Number	98-1599372
Entity Address, Address Line One	Point Building
Entity Address, Address Line Two	3 Waterloo Lane
Entity Address, City	Pembroke
Entity Address, Country	BM
Entity Address, Postal Zip Code	HM 08
City Area Code	441
Local Phone Number	542-3300
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 482.8
Entity Common Stock, Shares Outstanding		162,381,470
Documents Incorporated by Reference	Part III incorporates information from certain portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission within 120 days after the fiscal year ended December 31, 2022.
Entity Central Index Key	0001576018
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Shares, $0.10 par value
Entity Listings [Line Items]
Title of 12(b) Security	Common Shares, $0.10 par value
Trading Symbol	SPNT
Security Exchange Name	NYSE
8.00% Resettable Fixed Rate Preference Shares, Series B, $0.10 par value, $25.00 liquidation preference per share
Entity Listings [Line Items]
Title of 12(b) Security	8.00% Resettable Fixed Rate Preference Shares, Series B, $0.10 par value, $25.00 liquidation preference per share
Trading Symbol	SPNT PB
Security Exchange Name	NYSE

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020
Audit Information [Abstract]
Auditor Name	PricewaterhouseCoopers LLP	Ernst & Young Ltd.
Auditor Location	New York, New York	Hamilton, Bermuda
Auditor Firm ID	238	1277

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets
Debt securities, available for sale, at fair value, net of allowance for credit losses of $0.0 (2021 - N/A) (cost - $2,678.1; 2021 - N/A)	$ 2,635.5	$ 0
Debt securities, trading, at fair value (cost - $1,630.1; 2021 - $2,099.3)	1,526	2,085.6
Short-term investments, at fair value (cost - $984.5; 2021 - $1,076.0)	984.6	1,075.8
Investments in related party investment funds, at fair value	128.8	909.6
Other long-term investments, at fair value (cost - $392.0; 2021 - $443.0) (includes related party investments at fair value of $201.2 (2021 - $258.2))	377.2	456.1
Equity securities, trading, at fair value (cost - $1.8; 2021 - $4.5)	1.6	2.8
Total investments	5,653.7	4,529.9
Cash and cash equivalents	705.3	999.8
Restricted cash and cash equivalents	208.4	948.6
Redemption receivable from related party investment fund	18.5	250
Due from brokers	4.9	15.9
Interest and dividends receivable	26.7	8.3
Insurance and reinsurance balances receivable, net	1,876.9	1,708.2
Deferred acquisition costs and value of business acquired, net	294.9	218.8
Unearned premiums ceded	348.8	242.8
Loss and loss adjustment expenses recoverable, net	1,376.2	1,215.3
Deferred tax asset	200.3	182
Intangible assets	163.8	171.9
Other assets	157.9	126.8
Total assets	11,036.3	10,618.3
Liabilities
Loss and loss adjustment expense reserves	5,268.7	4,841.4
Unearned premium reserves	1,521.1	1,198.4
Reinsurance balances payable	813.6	688.3
Deposit liabilities	140.5	150.7
Securities sold, not yet purchased, at fair value	27	0
Securities sold under an agreement to repurchase	18	0
Due to brokers	0	6.5
Accounts payable, accrued expenses and other liabilities	266.6	229.8
Deferred tax liability	59.8	95.4
Liability-classified capital instruments	60.4	87.8
Debt	778	816.7
Total liabilities	8,953.7	8,115
Commitments and contingent liabilities
Shareholders’ equity
Common shares (issued and outstanding: 162,177,653; 2021 - 161,929,777)	16.2	16.2
Additional paid-in capital	1,641.3	1,622.7
Retained earnings	262.2	665
Accumulated other comprehensive loss, net of tax	(45)	(0.2)
Shareholders’ equity attributable to SiriusPoint shareholders	2,074.7	2,503.7
Noncontrolling interests	7.9	(0.4)
Total shareholders’ equity	2,082.6	2,503.3
Total liabilities, noncontrolling interests and shareholders’ equity	11,036.3	10,618.3
Series B preference shares
Shareholders’ equity
Series B preference shares (par value $0.10; authorized and issued: 8,000,000)	$ 200	$ 200

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt securities, available for sale, allowance for credit losses	$ 0
Debt securities, available for sale, cost	2,678.1
Debt securities, trading, cost	1,630.1	$ 2,099.3
Short-term investments, cost	984.5	1,076
Other long-term investments, cost	392	443
Related party investments at fair value	201.2	258.2
Equity securities, trading, cost	$ 1.8	$ 4.5
Common shares, shares issued (in shares)	162,177,653	161,929,777
Common shares, shares outstanding (in shares)	162,177,653	161,929,777
Series B preference shares
Preference shares, par value (in dollars per share)	$ 0.10	$ 0.1
Preference shares, shares authorized (in shares)	8,000,000	8,000,000
Preference shares, shares issued (in shares)	8,000,000	8,000,000

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net premiums earned	$ 2,318.1	$ 1,717	$ 610.8
Net realized and unrealized investment gains (losses)	(225.5)	(16.9)	69.2
Net realized and unrealized investment gains (losses) from related party investment funds	(210.5)	304	195
Net investment income	113.3	25.4	14.7
Net realized and unrealized investment gains (losses) and net investment income	(322.7)	312.5	278.9
Other revenues	110.2	151.2	0
Total revenues	2,105.6	2,180.7	889.7
Expenses
Loss and loss adjustment expenses incurred, net	1,588.4	1,326.5	465.3
Acquisition costs, net	461.9	387.8	187.1
Other underwriting expenses	184.5	158.8	30.1
Net corporate and other expenses	312.8	266.6	41.9
Intangible asset amortization	8.1	5.9	0
Interest expense	38.6	34	8.2
Foreign exchange (gains) losses	(66)	(44)	5.2
Total expenses	2,528.3	2,135.6	737.8
Income (loss) before income tax (expense) benefit	(422.7)	45.1	151.9
Income tax (expense) benefit	36.7	10.7	(8.1)
Net income (loss)	(386)	55.8	143.8
Net (income) loss attributable to noncontrolling interests	(0.8)	2.3	(0.3)
Net income (loss) available to SiriusPoint	(386.8)	58.1	143.5
Dividends on Series B preference shares	(16)	(13.5)	0
Net income (loss) available to SiriusPoint common shareholders, baisc	(402.8)	44.6	143.5
Net income (loss) available to SiriusPoint common shareholders, diluted	$ (402.8)	$ 44.6	$ 143.5
Earnings (loss) per share available to SiriusPoint common shareholders
Basic earnings per share available to SiriusPoint common shareholders (in dollars per share)	$ (2.51)	$ 0.28	$ 1.54
Diluted earnings per share available to SiriusPoint common shareholders (in dollars per share)	$ (2.51)	$ 0.27	$ 1.53
Weighted average number of common shares used in the determination of earnings (loss) per share
Basic (in shares)	160,228,588	148,667,770	92,510,090
Diluted (in shares)	160,228,588	150,156,466	92,957,799

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Comprehensive income (loss)
Net income (loss)	$ (386)	$ 55.8	$ 143.8
Other comprehensive loss, net of tax
Change in foreign currency translation	(5)	(0.2)	0
Unrealized losses from debt securities held as available for sale investments	(42.5)	0	0
Reclassifications from accumulated other comprehensive income	2.7	0	0
Total other comprehensive loss	(44.8)	(0.2)	0
Comprehensive income (loss)	(430.8)	55.6	143.8
Net (income) loss attributable to noncontrolling interests	(0.8)	2.3	(0.3)
Comprehensive income (loss) available to SiriusPoint	$ (431.6)	$ 57.9	$ 143.5

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Parent	Preference shares Series B preference shares	Common shares	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss, net of tax	Net change in foreign currency translation adjustment	Unrealized gains (losses) from debt securities held as available for sale investments	Noncontrolling interests
Balance, beginning of period at Dec. 31, 2019			$ 0	$ 9.5	$ 927.7	$ 476.9	$ 0	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net			0
Issuance of common shares, net				0.1	(0.4)
Acquisition of Sirius Group				0	0
Issuance of common shares to related party				0	0
Common shares repurchased and retired				0	0
Share compensation					6.6
Net income (loss)	$ 143.8					143.8
Net (income) loss attributable to noncontrolling interests	(0.3)					(0.3)
Dividends on preference shares						0
Change in foreign currency translation	0							0
Unrealized gains (losses) from debt securities held as available for sale investments	0								0
Reclassifications from accumulated other comprehensive income	0								0
Balance, end of period at Dec. 31, 2020	1,565.3	$ 1,563.9	0	9.6	933.9	620.4	0	0	0	$ 1.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net			200
Issuance of common shares, net				0.2	2.8
Acquisition of Sirius Group				5.8	589.7
Issuance of common shares to related party				0.6	48
Common shares repurchased and retired				0	0
Share compensation					48.3
Net income (loss)	55.8					55.8
Net (income) loss attributable to noncontrolling interests	2.3					2.3
Dividends on preference shares						(13.5)
Change in foreign currency translation	(0.2)							(0.2)
Unrealized gains (losses) from debt securities held as available for sale investments	0								0
Reclassifications from accumulated other comprehensive income	0								0
Balance, end of period at Dec. 31, 2021	2,503.3	2,503.7	200	16.2	1,622.7	665	(0.2)	(0.2)	0	(0.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net			0
Issuance of common shares, net				0.1	0
Acquisition of Sirius Group				0	0
Issuance of common shares to related party				0	0
Common shares repurchased and retired	(5)			(0.1)	(4.9)
Share compensation					23.5
Net income (loss)	(386)					(386)
Net (income) loss attributable to noncontrolling interests	(0.8)					(0.8)
Dividends on preference shares						(16)
Change in foreign currency translation	(5)							(5)
Unrealized gains (losses) from debt securities held as available for sale investments	(42.5)								(42.5)
Reclassifications from accumulated other comprehensive income	2.7								2.7
Balance, end of period at Dec. 31, 2022	$ 2,082.6	$ 2,074.7	$ 200	$ 16.2	$ 1,641.3	$ 262.2	$ (45)	$ (5.2)	$ (39.8)	$ 7.9

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income (loss)	$ (386)	$ 55.8	$ 143.8
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Share compensation	30.5	11.4	6.6
Net realized and unrealized (gain) loss on investments and derivatives	207.6	3	(62.5)
Net realized and unrealized (gain) loss on investment in related party investment funds	210.5	(304)	(195)
Other revenues	(27.4)	(100.1)	0
Gain from sale of consolidated subsidiary	0	(5.8)	0
Amortization of premium and accretion of discount, net	(17.2)	9.5	(3.8)
Amortization of intangible assets	8.1	5.9	0
Depreciation and other amortization	5.8	6.1	0
Other items, net	(33.8)	(22.6)	6.1
Changes in assets and liabilities:
Insurance and reinsurance balances receivable, net	(164.7)	(48.3)	38.6
Deferred acquisition costs and value of business acquired, net	(76.1)	(2.3)	23.6
Unearned premiums ceded	(106)	(33.3)	(17.3)
Loss and loss adjustment expenses recoverable, net	(160.9)	(390.2)	(8.9)
Deferred tax asset/liability	(53.9)	(44.8)	7.9
Other assets	(36.9)	34.8	(4.6)
Interest and dividends receivable	(18.4)	0.6	1.3
Loss and loss adjustment expense reserves	427.3	614.8	190.3
Unearned premium reserves	322.7	13.6	(51.3)
Reinsurance balances payable	125.3	223	1.8
Accounts payable, accrued expenses and other liabilities	36.8	(25.5)	(3.3)
Net cash provided by operating activities	293.3	1.6	73.3
Investing activities
Proceeds from redemptions from related party investment funds	741.8	200	0
Purchases of investments	(6,161.3)	(3,409.6)	(431.2)
Proceeds from sales and maturities of investments	4,110.7	2,687.9	532.2
Change in due to/from brokers, net	4.5	77.9	(95)
Acquisition of Sirius Group, net (cash and restricted cash acquired of $740.3)	0	631.9	0
Proceeds from sale of consolidated subsidiary, net of cash sold	0	20.5	0
Net cash provided by (used in) investing activities	(1,304.3)	208.6	6
Financing activities
Proceeds from issuance of SiriusPoint common shares, net of costs	0	50.8	0
Taxes paid on withholding shares	(7.1)	(0.5)	(0.3)
Purchases of SiriusPoint common shares under share repurchase program	(5)	0	0
Proceeds from loans under an agreement to repurchase	17.6	0	0
Cash dividends paid to preference shareholders	(16)	(12.2)	0
Net payments on deposit liability contracts	(14)	(14)	(20.2)
Change in total noncontrolling interests, net	0.8	0.2	1.1
Net cash provided by (used in) financing activities	(23.7)	24.3	(19.4)
Net increase (decrease) in cash, cash equivalents and restricted cash	(1,034.7)	234.5	59.9
Cash, cash equivalents and restricted cash at beginning of year	1,948.4	1,713.9	1,654
Cash, cash equivalents and restricted cash at end of year	913.7	1,948.4	1,713.9
Supplementary information
Interest paid in cash	39.2	39.3	8.3
Income taxes paid (received) in cash	$ (2.2)	$ 14.7	$ 0.1

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Statement of Cash Flows [Abstract]
Cash and restricted cash acquired	$ 740.3

Organization

Organization	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	1. Organization SiriusPoint Ltd. (together with its consolidated subsidiaries, “SiriusPoint” or the “Company”) was incorporated under the laws of Bermuda on October 6, 2011. Through its subsidiaries, the Company is a provider of global multi-line reinsurance and insurance products and services. On February 26, 2021, the Company complete d the acquisition of Sirius International Insurance Group, Ltd. (“Sirius” or “Sirius Group”) and changed its name from Third Point Reinsurance Ltd. to SiriusPoint Ltd. (“SiriusPoint”) . The results of operations and cash flows of Sirius Group are included from the acquisition date of February 26, 2021 forward. All references to SiriusPoint throughout this Form 10-K for periods prior to the acquisition date refer to legacy Third Point Reinsurance Ltd., unless otherwise indicated. For additional information, see Note 3 to our consolidated financial statements. These consolidated financial statements include the results of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). All significant intercompany accounts and transactions have been eliminated. Tabular amounts are in U.S. Dollars in millions, except share amounts, unless otherwise noted.

Significant accounting policies

Significant accounting policies	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Significant accounting policies	2. Significant accounting policies The following is a summary of the significant accounting and reporting policies adopted by the Company: Use of estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported and disclosed amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The major estimates reflected in the Company’s consolidated financial statements include, but are not limited to, the loss and loss adjustment expense reserves, estimates of written and earned premiums and fair value of financial instruments. Business combinations and intangible assets The Company accounts for business combinations in accordance with Accounting Standards Codification ("ASC") Topic 805 Business Combinations , and intangible assets that arise from business combinations in accordance with ASC Topic 350 Intangibles – Goodwill and Other . The difference between the fair value of net assets acquired and the purchase price is recorded as a bargain purchase gain in other revenues in the consolidated statements of income (loss). Intangible assets arising from our business acquisitions are classified as either finite or indefinite-lived intangible assets. Finite-lived intangible assets are amortized over their useful lives with the amortization expense being recognized in the consolidated statements of income (loss). The amortization periods approximate the period over which the Company expects to generate future net cash inflows from the use of these assets. All of these assets are subject to impairment testing for the impairment or disposal of long-lived assets when events or conditions indicate that the carrying value of an asset may not be fully recoverable from future cash flows. Indefinite-lived intangible assets are however not subject to amortization. The carrying values of intangible assets are reviewed for indicators of impairment at least annually. The Company initially evaluates indefinite-lived intangible assets using a qualitative approach to determine whether it is more likely than not that the fair value is greater than its carrying value. If the results of the qualitative evaluation indicate that it is more likely than not that the carrying value exceeds its fair value, the Company performs the quantitative test for impairment. If indefinite-lived intangible assets are impaired, such assets are written down to their fair values with the related expense recognized in the consolidated statements of income (loss). Cash, cash equivalents and restricted cash Cash and cash equivalents consist of cash held in banks and other short-term, highly liquid investments with original maturity dates of ninety days or less. Restricted cash and cash equivalents consist of cash held in trust accounts securing obligations under certain reinsurance contracts and cash held in trust accounts securing letters of credit issued under credit facilities. Premium revenue recognition Effective January 1, 2021, the Company changed its accounting policy for assumed written premiums. Previously, the Company estimated ultimate premium written for the entire contract period and recorded this estimate at inception of the contract. For contracts where the full premium written was not estimable at inception, the Company recorded premium written for the portion of the contract period for which the amount was estimable. The Company changed its accounting policy to recognize premiums written ratably over the term of the related policy or reinsurance treaty consistent with the timing of when the ceding company has recognized the written premiums. Premiums written include amounts reported by brokers and ceding companies, supplemented by the Company's own estimates of premiums where reports have not been received. The determination of premium estimates requires a review of the Company's experience with the ceding companies, managing general underwriters, familiarity with each market, the timing of the reported information, an analysis and understanding of the characteristics of each class of business and management's judgment of the impact of various factors, including premium or loss trends, on the volume of business written and ceded to the Company. On an ongoing basis, the Company's underwriters review the amounts reported by these third parties for reasonableness based on their experience and knowledge of the subject class of business, taking into account the Company's historical experience with the brokers or ceding companies. Changes in premium estimates are expected and may result in adjustments in any reporting period. Any subsequent adjustments arising on such estimates are recorded in the period in which they are determined. The change in policy has been made because it is management’s opinion that the revised policy reflects the timing of when premiums are written by the cedent and reduces estimation uncertainty regarding the assets and liabilities recorded. The following tables provide a summary of the retrospective impact from the change in accounting policy on the Company’s consolidated financial statements: Consolidated statement of income Year ended December 31, 2020 As previously reported Adjustment As adjusted Gross premiums written $ 588.0 $ 0.5 $ 588.5 Gross premiums ceded (39.7) (6.6) (46.3) Net premiums written 548.3 (6.1) 542.2 Change in net unearned premium reserves 62.5 6.1 68.6 Net premiums earned $ 610.8 $ — $ 610.8 Net income available to SiriusPoint common shareholders $ 143.5 $ — $ 143.5 Consolidated statement of cash flow Year ended December 31, 2020 As previously reported Adjustment As adjusted Insurance and reinsurance balances receivable, net $ 38.8 $ (0.2) $ 38.6 Deferred acquisition costs and value of business acquired, net 20.4 3.2 23.6 Unearned premiums ceded (10.7) (6.6) (17.3) Unearned premium reserves (51.8) 0.5 (51.3) Reinsurance balances payable (1.3) 3.1 1.8 Net cash provided by operating activities $ 73.3 $ — $ 73.3 The change in accounting policy had no impact on the previously reported net income (loss) or shareholders’ equity attributable to SiriusPoint shareholders. Premiums for retroactive exposures in reinsurance contracts are earned at the inception of the contract, as all of the underlying loss events covered by these exposures occurred in the past. If the estimated loss and loss adjustment expense reserve differs from the premium received at inception of a retroactive reinsurance contract, the resulting difference is deferred and recognized over the estimated claim payment period of the related contract with the periodic amortization reflected in earnings as a component of loss and loss adjustment expenses incurred. Unearned premiums represent the portion of premiums written that relate to the remaining term of the underlying policies in force. Reinsurance premiums ceded The Company reduces the risk of losses on business written by reinsuring certain risks and exposures with other reinsurers. The Company remains liable to the extent that any retrocessionaire fails to meet its obligations and to the extent that the Company does not hold sufficient security for their unpaid obligations. Ceded premiums are written during the period in which the risks incept and are earned over the contract period in proportion to the period of risk covered. Unearned premiums ceded consist of the unexpired portion of insurance and reinsurance ceded. Funds held Funds held by ceding companies represent amounts due to the Company in connection with certain assumed reinsurance agreements in which the ceding company retains a portion of the premium to provide security against future loss payments. The funds held by ceding companies are generally invested by the ceding company and a contractually agreed interest amount is credited to the Company and recognized as investment income. These amounts are included in insurance and reinsurance balances receivable, net on the consolidated balance sheets. Funds held under reinsurance treaties represent contractual payments due from the Company that have been retained to secure such obligations. These amounts are included in reinsurance balances payable on the consolidated balance sheets. Reinsurance Reinsurance recoverables include claims we paid and estimates of unpaid losses and loss adjustment expenses that are subject to reimbursement under reinsurance and retrocessional contracts. The method for determining reinsurance recoverables for unpaid losses and loss adjustment expenses involves reviewing actuarial estimates of gross unpaid losses and loss adjustment expenses to determine our ability to cede unpaid losses and loss adjustment expenses under our existing reinsurance contracts. This method is continually reviewed and updated and any resulting adjustments are reflected in earnings in the period identified. Reinsurance premiums, commissions and expense reimbursements are accounted for on a basis consistent with those used in accounting for the original policies issued and the term of the reinsurance contracts. Amounts recoverable from reinsurers for losses and loss adjustment expenses for which the Company has not been relieved of its legal obligations to the policyholder are reported as assets. Deferred acquisition costs Deferred acquisition costs consist of commissions, brokerage expenses, excise taxes and other costs which are directly attributable to the successful acquisition or renewal of contracts and vary with the production of business. These costs are deferred and amortized over the period in which the related premiums are earned. Amortization of deferred acquisition costs are shown net of contractual commissions earned on reinsurance ceded within acquisition expenses, net in the consolidated statements of net income (loss). Acquisition costs also include profit commissions which are calculated and accrued based on the expected loss experience for contracts and recorded when the current loss estimate indicates that a profit commission is probable under the contract terms. As a result of the Sirius Group acquisition, a value of business acquired (“VOBA”) intangible asset was established. VOBA represents the expected future losses and expenses associated with the policies and contracts that were in-force as of the closing date of the transaction compared to the future premium remaining expected to be earned. The difference between the risk-adjusted future loss and expenses, discounted to present value, and the unearned premium reserve was estimated to be the VOBA. Amortization of VOBA is recorded in acquisition costs, net in the consolidated statements of net income (loss) and the VOBA related asset is included in deferred acquisition costs and value of business acquired, net on the consolidated balance sheets. As of December 31, 2022, VOBA was fully amortized and therefore had no carrying value. The Company evaluates the recoverability of deferred acquisition costs by determining if the sum of expected loss and loss adjustment expenses, expected dividends to policyholders, unamortized acquisition costs, and maintenance costs exceeds related unearned premiums and anticipated investment income. If a loss is probable on the unexpired portion of contracts in force, a premium deficiency loss is recognized. As of December 31, 2022, deferred acquisition costs are considered to be fully recoverable and no premiu m deficiency has been recorded. Loss and loss adjustment expense reserves The Company’s loss and loss adjustment expense reserves include case reserves, reserves for losses incurred but not yet reported (“IBNR reserves”) and deferred gains on retroactive reinsurance contracts. Case reserves are established for losses that have been reported, but not yet paid. IBNR reserves represent the estimated loss and loss adjustment expenses that have been incurred by insureds and reinsureds but not yet reported to the insurer or reinsurer, including unknown future development on loss and loss adjustment expenses that are known to the insurer or reinsurer. IBNR reserves are established by management based on actuarially determined estimates of ultimate loss and loss adjustment expenses. Inherent in the estimate of ultimate loss and loss adjustment expenses are expected trends in claim severity and frequency and other factors that may vary significantly as claims are settled. Accordingly, ultimate loss and loss adjustment expenses may differ materially from the amounts recorded in the consolidated financial statements. These estimates are reviewed regularly and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments, if any, are recorded in the consolidated statements of income (loss) in the period in which they become known. Deposit liabilities Certain contracts do not transfer sufficient insurance risk to be deemed reinsurance contracts and are accounted for using the deposit method of accounting. Management exercises judgment in determining whether contracts transfer sufficient risk to be accounted for as reinsurance contracts. Using the deposit method of accounting, a deposit liability, rather than written premium, is initially recorded based upon the consideration received less any explicitly identified premiums or fees. In subsequent periods, the deposit liability is adjusted by calculating the effective yield on the deposit to reflect actual payments to date and future expected payments. In some cases, the effective yield on the contract may be negative, which will result in the recognition of other income. Fixed interest credits on deposit accounted contracts are included in net corporate and other expenses in the consolidated statements of net income (loss) . Fair value measurement The Company determines the fair value of financial instruments in accordance with current accounting guidance, which defines fair value and establishes a three level fair value hierarchy based upon the transparency of inputs used in the valuation of an asset or liability. Fair value is defined as the price that the Company would receive to sell an asset or would pay to transfer a liability in an orderly transaction between market participants at the measurement date. The Company determines the estimated fair value of each individual security utilizing the highest level inputs available. Refer to Note 6 for additional information. Investments Short-term investments Short-term investments consist of U.S. treasury bills, certificates of deposit and other securities, which, at the time of purchase, mature within a period of greater than three months but less than one year. Short-term investments are classified as trading securities, carried at fair value and disclosed as a separate line item in the consolidated balance sheets. Debt Securities The Company’s investments are classified as either trading securities or available for sale (“AFS”). Trading securities are carried at fair value with changes in fair value included in earnings in the consolidated statements of income (loss). AFS securities are held at fair value, net of an allowance for credit losses, and any decline in fair value that is believed to arise from factors other than credit is recorded as a separate component of accumulated other comprehensive income (loss) in the consolidated statement of shareholders’ equity. The Company has elected to classify debt securities, other than short-term investments, purchased on or after April 1, 2022 as AFS. The fair value of the Company’s investments are based on quoted market prices, or when such prices are not available, by reference to broker or underwriter bid indications, industry recognized pricing vendors, and/or internal pricing valuation techniques. Investment transactions are recorded on a trade date basis with balances pending settlement included in due to/from brokers in the consolidated balance sheets. Realized gains and losses are determined using cost calculated on a specific identification basis and are reported pre-tax in revenues. Dividends are recorded on the ex-dividend date. Income and expenses are recorded on the accrual basis including interest and premiums amortized and discounts accreted. Other long-term investments Other long-term investments consist primarily of hedge funds, private equity funds, and strategic investments. The fair values of hedge funds and private equity funds that produce net asset value (“NAV”) are generally recorded based upon the Company's proportionate interest in the underlying fund's NAV, which is deemed to approximate fair value or the equity method where applicable. In addition, due to a lag in reporting, some of the fund managers, fund administrators or both, are unable to provide final fund valuations as of the Company's reporting date. In these circumstances and where the fair value option is elected, the Company uses all credible information available to estimate fair value. This includes utilizing preliminary estimates reported by its fund managers and using information that is available to the Company with respect to the underlying investments, as necessary. The changes in fair value are reported in pre-tax revenues in net realized and unrealized investment gains (losses). Actual final fund valuations may differ from the Company's estimates and these differences are recorded in the period they become known as a change in estimates. Other long-term investments include certain strategic investments that are carried at fair value, using the equity method or the cost adjusted for market observable events less impairment method. For strategic investments carried at fair value, management uses commonly accepted valuation methods (i.e., income approach, market approach). Where appropriate to utilize equity method, the Company recognizes its share of the investees’ income in net realized and unrealized investment gains (losses). Where criteria to be accounted for under the equity method is not met, we have elected to value our strategic investments at the cost adjusted for market observable events less impairment method, a measurement alternative in which the investment is measured at cost and remeasured to fair value when determined to be impaired or upon observable transactions prices becoming available. See Note 9 for additional information. Investments in related party investment funds The Company invests in Third Point Enhanced LP (“ TP Enhanced Fund ”), Third Point Venture Offshore Fund I LP (“TP Venture Fund”) and Third Point Venture Offshore Fund II LP (“ TP Venture Fund II ”) (collectively, the “Related Party Investment Funds”), which are related party investment funds. The Company’s investments in the funds are stated at their fair value, that generally represents the Company’s proportionate interest in the funds as reported by the fund based on the NAV provided by the fund administrator. Increases or decreases in such fair value are recorded within net realized and unrealized investment gains (losses) from related party investment funds in the Company’s consolidated statements of income (loss). The Company records contributions and withdrawals related to its investments in the funds on the transaction date. Derivative financial instruments The Company holds derivative contracts to manage credit risk, interest rate risk, currency exchange risk and other exposure risks. The Company uses derivatives in connection with its risk-management activities to economically hedge certain risks and to gain exposure to certain investments. The utilization of derivative contracts also allows for an efficient means by which to trade certain asset classes. Fair values of derivatives are determined by using quoted market prices, industry recognized pricing vendors and counterparty quotes when available; otherwise fair values were based on pricing models that consider the time value of money, volatility and the current market and contractual prices of underlying financial instruments. Share-based compensation The Company accounts for its share-based compensation transactions using the fair value of the award at the grant date and accounts for forfeitures when they occur. Determining the fair value of share purchase options at the grant date requires estimation and judgment. The Company uses an option-pricing model (Black-Scholes) to calculate the fair value of share purchase options and used a simplified method to develop the estimate of expected term, where appropriate. For share-based compensation awards that contain both a service and performance condition, the Company recognizes compensation expense only for the portion of the award that is considered probable of vesting. Fair value of share-based compensation awards considered probable of vesting are expensed over the requisite service period. The probability of share-based awards vesting is evaluated at each reporting period. Share-based compensation awards that contain only service condition and share purchase options are expensed ratably over the requisite service period. Defined benefit plans Certain SiriusPoint employees in Europe participate in defined benefit plans. The liability for the defined benefit plans that is reported on the consolidated balance sheets is the current value of the defined benefit obligation at the end of the period, reduced by the fair value of the plan's assets, with adjustments for actuarial gains and losses. The defined benefit pension plan obligation is calculated annually by independent actuaries. The current value of the defined benefit obligation is determined through discounting of expected future cash flows, using interest rates determined by current market interest rates. The service costs and actuarial gains and losses on the defined benefit obligation and the fair value on the plan assets are recognized in the consolidated statements of income (loss). Debt offering costs Costs incurred in issuing debt, which includes underwriters’ fees, legal and accounting fees, printing and other fees are capitalized and presented as a direct deduction from the principal amount of notes payable in the consolidated balance sheets. These costs are amortized over the term of the debt and are included in interest expense in the consolidated statements of income (loss). Other underwriting expenses and Net corporate and other expenses Other underwriting expenses primarily consist of general and administrative expenses and other operating income and expenses associated with underwriting activities. Other underwriting expenses are also comprised of expenses relating to interest crediting features in certain reinsurance contracts and changes in fair value of reinsurance contracts accounted for as derivatives. Variable and fixed interest crediting features are calculated on funds transferred to the Company where interest is credited based on actual cash received into a notional experience account. The ceding company can typically elect to commute at specific points in time in exchange for the amounts held in the notional experience account. For those contracts that contain variable interest crediting features, actual investment returns realized by the Company are included in the calculation, which can increase the overall effective interest crediting rate on those contracts. Variable interest credit features are accounted for as embedded derivatives. Fixed interest credits on reinsurance contracts are included in other underwriting expenses in the consolidated statements of income (loss). Net corporate and other expenses include services expenses, costs associated with operating as a publicly-traded company, non-underwriting activities, including service fee expenses from our MGA subsidiaries, and current expected credit losses (“CECL”) from our insurance and reinsurance balances receivable and loss and loss adjustment expenses recoverable and severance charges. Foreign currency exchange The U.S. dollar is the functional curre ncy for the Company’s businesses except for the Canadian reinsurance operations of SiriusPoint America Insurance Company. T he Company invests in securities denominated in foreign currencies. Assets and liabilities recorded in these foreign currencies are translated into U.S. dollars at exchange rates in effect at the balance sheet date, and revenues and expenses are translated using the average exchange rates for the period. Net foreign exchange gains and losses arising from the translation of functional currencies are reported in shareholders’ equity, in accumulated other comprehensive loss. As of December 31, 2022, the Company had net unrealized foreign currency translation losses of $5.0 million recorded in accumulated other comprehensive loss on its consolidated balance sheet. For non functional currencies, the resulting exchange gains and losses are reported as a component of net income (loss) in the period in which they arise within net realized and unrealized investment gains (losses) and net foreign exchange gains (losses). Federal and foreign income taxes The Company provides for income taxes for its operations in income tax paying jurisdictions. The Company’s provision relies on estimates and interpretations of currently enacted tax laws. The Company recognizes deferred tax assets and liabilities based on the temporary differences between the financial statement carrying amounts and the tax bases of assets and liabilities. A valuation allowance against deferred tax assets is recorded if it is more likely than not that all, or some portion, of the benefits related to deferred tax assets will not be realized. Any adjustments to deferred income taxes are accounted for as changes in estimates and are reflected in the consolidated statements of income (loss) in the year in which they are made. Adjustments could be material and could significantly impact earnings in the year they are recorded. Variable and voting interest entities We evaluate our investments to determine whether those investments are variable interest entities ("VIEs") or voting interest entities (“VOEs”) and whether consolidation is required. The Company consolidates the results of operations and financial position of all VOEs in which it has a controlling financial interest and VIEs in which it is considered to be the primary beneficiary. The consolidation assessment, including the determination as to whether an entity qualifies as a VOE or VIE, depends on the facts and circumstances surrounding each entity. VIE is a legal entity that does not have sufficient equity at risk to finance its activities without additional subordinated financial support or is structured such that equity investors lack the ability to make significant decisions relating to the entity’s operations through voting rights or do not substantively participate in the gains and losses of the entity. Consolidation of a VIE by its primary beneficiary is not based on majority voting interest, but is based on other criteria discussed below. FASB ASC Topic 810 Consolidation requires the consolidation of all VIEs by the primary beneficiary, that being the investor that has the power to direct the activities of the VIE and that will absorb a portion of the VIE’s expected losses or residual returns that could potentially be significant to the VIE. For VIEs the Company determines it has a variable interest in, it determines whether it is the primary beneficiary of a VIE by performing an analysis that principally considers: (i) the VIE’s purpose and design, including the risks the VIE was designed to create and pass through to its variable interest holders; (ii) the VIE’s capital structure; (iii) the terms between the VIE and its variable interest holders and other parties involved with the VIE; (iv) which variable interest holders have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; (v) which variable interest holders have the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE; and (vi) related party relationships. The Company reassesses its initial determination of whether the Company is the primary beneficiary of a VIE upon changes in facts and circumstances that could potentially alter the Company’s assessment. Noncontrolling interests The Company consolidates the results of entities in which it has a controlling financial interest. Noncontrolling interests are presented as a separate line within shareholders’ equity in the consolidated balance sheets. The Company records the portion of net (income) loss attributable to noncontrolling interests as a separate line within the consolidated statements of income (loss). Earnings per share Basic earnings per share is based on the weighted average number of common shares and participating securities outstanding during the period. The weighted average number of common shares excludes any dilutive effect of outstanding warrants, options and unvested restricted shares. Diluted earnings per share is based on the weighted average number of common shares and participating securities outstanding and includes any dilutive effects of warrants, options and unvested restricted shares under share plans and are determined using the treasury stock method. U.S. GAAP requires that unvested share awards that contain non-forfeitable rights to dividends or dividend equivalents, whether paid or unpaid (referred to as “participating securities”), be treated in the same manner as outstanding shares for earnings per share calculations. The Company treats certain of its unvested restricted shares as participating securities. In the event of a net loss, all participating securities, outstanding warrants, options and restricted shares are excluded from both basic and diluted loss per share since their inclusion would be anti-dilutive. Leases Leases in which substantially all of the risks and rewards of ownership are retained by the lessor are classified as operating leases. The Company does not have any leases classified as finance leases. For its operating leases, the Company recognizes lease assets and liabilities on the balance sheet, with the exception of leases with an original term of 12 months or less. Lease assets and liabilities are initially recognized and measured based on the present value of the lease payments. Segment information Under U.S. GAAP, operating segments are based on the internal information that management uses for allocating resources and assessing perfor mance of the Company. The Company manages its business on the basis of two operating segments: Reinsurance and Insurance & Services. Liability-classified capital instruments As part of the consideration transferred in the acquisition of Sirius Group, the Company issued various instruments that were classified as liabilities based on their terms, notably the settlement features for each and any potential adjustments to the exercise price for the warrants issued. Liability-classified capital instruments reported in the consolidated balance sheets include Series A preference shares, Merger Warrants, Private Warrants, Sirius Group Public Warrants, Upside Rights and Contingent Value Rights. See Note 3 for additional information on each of these instruments. The liability-classified capital instruments are carried at fair value with changes in fair value included in other revenues in the consolidated statements of income (loss). Recent accounting pronouncements Recently Issued Accounting Standards Not Yet Adopted In June 2022, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions (“ASU 2022-03”). The amendment clarifies the guidance in Topic 820 on the fair value measurement of an equity security that is subject to a contractual sale restriction and requires specific disclosures related to such an equity security. ASU 2022-03 is effective for public business entities for fiscal years beginning after December 15, 2023 and interim periods within those fiscal years. This new pronouncement is not expected to have a material impact on the Company’s consolidated financial statements. Reclassifications Certain amounts in the prior period financial statements have been reclassified to conform to the

Acquisition of Sirius Group

Acquisition of Sirius Group	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisition of Sirius Group	3. Acquisition of Sirius Group Overview On February 26, 2021, the Company completed its acquisition of Sirius Group. Prior to the closing of the acquisition, Sirius Group was a publicly listed company and traded on the Nasdaq Global Select Market under the symbol “SG”. Sirius Group, through its wholly owned subsidiaries, provides multi-line insurance and reinsurance on a worldwide basis. The acquisition of Sirius Group is expected to benefit the Company through expanded underwriting capabilities, geographic footprint and product offerings. Pursuant to the terms of the acquisition, each common share, par value $0.01 per share, of Sirius Group (each, a “Sirius Share”) that was issued and outstanding immediately prior to the closing date of the acquisition was canceled and converted into the right to receive one of the following three consideration options at the shareholder’s election: • $9.50 in cash; • a combination of common shares, par value $0.10 per share, of the Company (“Company shares”), and CVR consideration comprising (1) 0.743 of a Company share and (2) one contractual contingent value right (each, a “CVR”), which represents the right to receive a contingent cash payment, which, taken together with the fraction of the Company share received, guarantee that on the second anniversary of the acquisition, the electing shareholder will have received equity and cash valued at least $13.73 per Sirius Share; should SiriusPoint shares trade at or above $18.50 over any 14 consecutive trading day period up to the second anniversary of the acquisition, the CVR component will be automatically extinguished (4.7 million CVRs were issued under this consideration option); or • a combination of cash, Company shares, Series A preference shares, warrants and Upside Rights (a “Mixed Election”) comprising (1) $0.905 in cash, (2) 0.496 Company shares, (3) 0.106 Series A preference shares, par value $0.10 per share, of the Company (the “Series A preference shares”), (4) 0.190 of a warrant (each, a “Merger warrant”) and (5) $0.905 aggregate principal amount of an “upside right” issued by the Company (collectively, the “Upside Rights”). Pursuant to the Company Voting and Support Agreement, CM Bermuda Limited (“CM Bermuda”), whose parent company is CMIG International Holdings Pte. Ltd. (“CMIG International”), made the Mixed Election. The aggregate consideration for the transaction included the issuance of 58,331,196 SiriusPoint common shares valued at $595.6 million and $100.4 million of cash. In addition to the SiriusPoint common shares and the cash, the aggregate consideration for the transaction also consisted of the issuance of preference shares, warrants, and other contingent value components, as discussed below. The cash consideration portion was funded from available cash resources and $48.6 million from the issuance of SiriusPoint common shares pursuant to the equity commitment letter between the Company, Third Point Opportunities Master Fund Ltd. and Daniel S. Loeb, pursuant to which Third Point Opportunities Master Fund Ltd. committed to purchase up to 9.5% of the Company’s shares in connection with closing of the acquisition of Sirius Group. Series A Preference Shares On February 26, 2021, certain holders of Sirius Group shares elected to receive Series A preference shares, par value $0.10 per share (“Series A Preference Shares”), with respect to the consideration price of the Sirius Group acquisition. The Company issued 11,720,987 Series A Preference Shares. The Series A Preference Shares rank pari passu with the Company’s common shares with respect to the payment of dividends or distributions. Each Series A Preference Share has voting power equal to the number of Company shares into which it is convertible, and the Series A Preference Shares and Company shares shall vote together as a single class with respect to any and all matters. During the year ended December 31, 2022, the Compan y did not declare or pay dividends to Series A preference shareholders. Upon the third anniversary of the closing date of the Sirius Group acquisition, the Series A Preference Shares will be subject to a conversion ratio calculation, which will be based on ultimate COVID-19 losses along with other measurement criteria, to convert to the Company’s common shares. Series A preference shares are recorded at fair value in the liability-classified capital instruments line of the consolidated balance sheets. During the year ended December 31, 2022, the Company recorded a gain of $18.6 million from the change in fair value of the Series A preference shares. As of December 31, 2022, t he estimated fair value of the Series A preference shares is $1.8 million. Merger Warrants On February 26, 2021, the Company issued certain warrants with respect to the consideration price of the Sirius Group acquisition (the “Merger warrants”) . As of December 31, 2022, the Company had reserved for issuance common shares underlying warrants to purchase, in the aggregate, up to 21,009,324 common shares, to previous Sirius Group common shareholders. The Merger warrants are recorded at fair value in the liability-classified capital instruments line of the consolidated balance sheets. During the year ended December 31, 2022, the Company recorded a gain of $17.8 million from the change in fair value of the Merger warrants. As of December 31, 2022, t he estimated fair value of the Merger warrants is $14.7 million. Sirius Group Private Warrants On February 26, 2021, the Company entered into an assumption agreement pursuant to which the Company agreed to assume all of the warrants issued on November 5, 2018 and November 28, 2018 (the “Private warrants”) by Sirius Group to certain counterparties. The Private warrants are recorded at fair value in the liability-classified capital instruments line of the consolidated balance sheets. During the year ended December 31, 2022, the Company recorded a loss of $1.7 million from the change in fair value of the P rivate warrants. As of December 31, 2022, t he estimated fair value of the Private warrants is $4.9 million. Sirius Group Public Warrants Under the merger agreement between Sirius Group and Easterly Acquisition Corporation, each of Easterly’s existing issued and outstanding public warrants was converted into a warrant exercisable for Sirius Group common shares (“Sirius Group Public Warrants”). From February 26, 2021, holders of the Sirius Group Public Warrants have the right to receive the merger consideration that the holder of the Sirius Group Public Warrants would have received if such holder had exercised his, her or its warrants immediately prior to February 26, 2021. Because the exercise price of such Sirius Group Public Warrants of $18.89 was greater than the per share merger consideration, no such warrants were exercised prior to the completion of the merger and therefore no merger consideration was paid to holders of such warrants. The Sirius Group Public Warrants are not currently listed on any public exchange and will terminate in accordance with their terms. The Sirius Group Public Warrants are recorded at fair value in the liability-classified capital instruments line of the consolidated balance sheets. During the year ended December 31, 2022, the Company recorded a gain of $1.1 million from the change in fair value of the Sirius Group Public Warrants. As of December 31, 2022, the Sirius Group Public Warrants had no estimated fair value. Upside Rights On February 26, 2021, the Company issued Upside Rights with respect to the consideration price of the Sirius Group acquisition. The Upside Rights expired without any value on February 26, 2022. Contingent Value Rights On February 26, 2021, the Company entered into a contingent value rights agreement with respect to the consideration price of the Sirius Group acquisition. The contingent value rights (“ CVRs”) are recorded at fair value in the liability-classified capital instruments line of the consolidated balance sheets. During the year ended December 31, 2022, the Company recorded a loss of $8.4 million from the change in fair value of the CVRs . As of December 31, 2022, t he fair value of the CVRs is $39.0 million. The CVRs became publicly traded on the OTCQX Best Market during the quarter ended June 30, 2021. Purchase Price The components of the Company's total purchase price for Sirius Group at February 26, 2021 were as follows: Cash consideration Sirius Group shares acquired for cash $ 100.4 Common Shares Common Shares issued by SiriusPoint 58,331,196 SiriusPoint share price as of February 26, 2021 $ 10.21 595.6 Preference Shares Series A Preference Shares issued, at fair value 40.8 Series B Preference Shares issued, at fair value (1) 200.0 Warrants Merger warrants issued, at fair value 53.4 Private warrants issued, at fair value 7.3 Sirius Group Public Warrants, at fair value 2.6 Upside Rights Upside Rights issued, at fair value 6.5 Contingent value rights (CVRs) CVRs issued, at fair value 27.0 CVR waiver restricted shares 0.7 Other Fair value of the replaced Sirius Group equity awards attributable to pre-combination services 37.5 Transaction fee reimbursement 8.0 Total purchase price $ 1,079.8 (1) See Note 17 for additional information. Fair Value of Net Assets Acquired and Liabilities Assumed The following table summarizes the estimated fair values of major classes of identifiable assets acquired and liabilities assumed of Sirius Group as of February 26, 2021, the date the transaction closed: Identifiable net assets: Cash and investments $ 3,944.1 Insurance and reinsurance balances receivable, net 1,201.0 Reinsurance assets 649.7 Value of business acquired 147.9 Deferred tax asset 228.0 Intangible assets 178.8 Other assets 181.9 Loss and loss adjustment expense reserves (2,928.5) Unearned premium reserves (900.0) Deferred tax liability (186.8) Debt (728.2) Other liabilities (657.7) Total identifiable net assets acquired 1,130.2 Total purchase price 1,079.8 Bargain purchase gain $ 50.4 The bargain purchase gain represents the excess of the fair value of the underlying net assets acquired and liabilities assumed over the purchase price. The gain from bargain purchase is included in other revenues in the consolidated statements of income (loss). The bargain purchase determination is consistent with the fact that Sirius Group’s shares traded at a discount to book value and the need for Sirius Group to quickly diversify its ownership base. An explanation of the significant fair value adjustments is as follows: • Goodwill and intangibles - to eliminate the goodwill and intangible assets in Sirius Group net assets acquired as part of the purchase accounting; • Loss and loss adjustment expense reserves - to record loss and loss adjustment expense reserves at fair value, reflecting an increase for a market based risk margin, which represents the cost of capital required by a market participant to assume the loss and loss adjustment expense reserves of Sirius Group, partially offset by a deduction which represents the discount due to the present value calculation of the loss and loss adjustment expense reserves based on the expected payout of the net unpaid loss and loss adjustment expense reserves. The fair value adjustment resulted in an additional liability of $80.6 million which is amortized over the expected settlement period of the underlying claims. In addition, management increased certain casualty loss reserves by $70.0 million in order to reflect a consistent reserving approach between the two companies. The increase was in response to accumulated loss experience and the broader industry trends of social inflation; • Deferred acquisition costs - to eliminate Sirius Group’s deferred acquisition costs asset; • Value of business acquired (“VOBA”) - the expected future losses and expenses associated with the policies and contracts that were in-force as of the closing date of the transaction were estimated and compared to the future premium remaining expected to be earned. The difference between the risk-adjusted future loss and expenses, discounted to present value and the unearned premium reserve, was estimated to be the VOBA. The Company recognized VOBA of $147.9 million as a result of the Sirius Group acquisition. As of December 31, 2022, VOBA was fully amortized and therefore had no carrying value (2021 - $50.0 million). In the year ended December 31, 2022, amortization of $50.0 million (2021- $97.9 million) was recorded in acquisition costs, net in the consolidated statements of net income (loss); • Finite-lived insurance intangible assets - to establish the fair value of identifiable finite-lived insurance intangible assets acquired, including customer and other relationships, trade names and technology. The fair values of the finite-lived intangible assets relating to customer and other relationships were determined using the multi-period excess earnings approach. This method reflects the present value of the projected cash flows that are expected to be generated by the asset, reduced by returns on contributory assets. The Company recognized identifiable finite-lived intangible assets of $130.0 million, which will be amortized over their estimated useful lives; • Indefinite-lived insurance intangible assets - to establish the fair value of identifiable indefinite-lived insurance intangible assets acquired (Lloyd’s capacity and insurance licenses). The Company recognized identifiable indefinite lived intangible assets of $48.8 million; and • Deferred tax - to reflect adjustments to net deferred tax assets and liabilities related to the fair value adjustments above. Identifiable intangible assets consisted of the following and are included in intangible assets on the Company’s consolidated balance sheets as of December 31, 2022 and 2021 : Economic Useful Life Gross balance at February 26, 2021 Accumulated amortization Net balance at December 31, 2022 Distribution relationships 17 years $ 75.0 $ (1.9) $ 73.1 MGA relationships 13 years 34.0 (9.4) 24.6 Lloyd’s Capacity - Syndicate 1945 Indefinite 41.8 — 41.8 Insurance licenses Indefinite 7.0 — 7.0 Trade name 16 years 16.0 (0.8) 15.2 Internally developed computer software 5 years 5.0 (1.9) 3.1 Identifiable intangible assets $ 178.8 $ (14.0) 164.8 Insurance licenses sold (1.0) Net identifiable intangible assets at December 31, 2022 related to the acquisition of Sirius Group (1) $ 163.8 Economic Useful Life Gross balance at February 26, 2021 Accumulated amortization Net balance at December 31, 2021 Distribution relationships 17 years $ 75.0 $ — $ 75.0 MGA relationships 13 years 34.0 (4.9) 29.1 Lloyd’s Capacity - Syndicate 1945 Indefinite 41.8 — 41.8 Insurance licenses Indefinite 7.0 — 7.0 Trade name 16 years 16.0 (0.2) 15.8 Internally developed computer software 5 years 5.0 (0.8) 4.2 Identifiable intangible assets $ 178.8 $ (5.9) 172.9 Insurance licenses sold (1.0) Net identifiable intangible assets at December 31, 2021 related to the acquisition of Sirius Group (1) $ 171.9 (1) No impairments were recorded in the years ended December 31, 2022 and 2021. The estimated remaining amortization expense for the Company's intangible assets with finite lives is as follows: 2023 $ 11.1 2024 12.0 2025 11.4 2026 9.9 2027 and thereafter 71.6 Total remaining amortization expense $ 116.0 An explanation of the identifiable intangible assets is as follows: • Distribution relationships - refers to the relationships Sirius Group has established with external independent distributors and brokers to facilitate the distribution of its products in the marketplace. As a result of owning the distribution relationships, management will not have to duplicate historical marketing, training, and start-up expenses to redevelop comparable relationships to support business operations; • MGA relationships - refers to relationships with managing general agents on the direct insurance business. Through the MGA relationships, Sirius Group generates a predictable and recurring stream of service fee revenue; • Lloyd’s Capacity - Syndicate 1945 - relates to relationships associated with the right to distribute and market policies underwritten through Lloyd’s Syndicate 1945; • Insurance licenses - Sirius Group, like other insurance providers, is required to maintain licenses to produce and service insurance contracts. Insurance licenses are estimated to have an indefinite life and are therefore not amortized but are subject to periodic impairment testing; • Trade name - represents the value of the Sirius Group brand acquired; and • Internally developed computer software - represents the value of internally developed computer software utilized by the Company. Financial results The following table su mmarizes the results of Sirius Group that have been included in the Company's consolidated statements of income for the year ended December 31, 2021 : For the period from February 26, 2021 to December 31, 2021 Total revenues $ 1,224.3 Net loss $ (161.2) Supplemental Pro Forma Information Sirius Group’s results have been included in the Company's consolidated financial statements from February 26, 2021 to December 31, 2021 and for the year ended December 31, 2022. As such, the following table presents unaudited pro forma consolidated financial information for the years ended December 31, 2021 and 2020, and assumes the acquisition of Sirius Group occurred on January 1, 2020. The unaudited pro forma consolidated financial information is provided for informational purposes only and is not necessarily, and should not be assumed to be, an indication of the results that would have been achieved had the transaction been completed as of January 1, 2020 or that may be achieved in the future. The unaudited pro forma consolidated financial information does not give consideration to the impact of possible revenue enhancements, expense efficiencies, synergies or asset dispositions that may result from the acquisition of Sirius Group. In addition, unaudited pro forma consolidated financial information does not include the effects of costs associated with any restructuring or integration activities resulting from the acquisition of Sirius Group, as they are nonrecurring. 2021 2020 Total revenues $ 2,343.9 $ 2,613.6 Net income (loss) $ 60.7 $ (268.4) Among other adjustments, and in addition to the fair value adjustments and recognition of identifiable intangible assets noted above, other material nonrecurring pro forma adjustments directly attributable to the acquisition of Sirius Group principally included certain adjustments to recognize transaction related costs, align reserving approach, amortize fair value adjustments, amortize identifiable indefinite lived intangible assets and recognize related tax impacts.

Segment reporting

Segment reporting	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segment reporting	4. Segment reporting The determination of the Company’s business segments is based on the manner in which management monitors the performance of its operations. The Company reports two operating segments: Reinsurance and Insurance & Services. The Company's segments each have managers who are responsible for the overall profitability of their segments and who are directly accountable to the Company's chief operating decision maker, the Chief Executive Officer ("CEO"). The CEO assesses segment operating performance, allocates capital, and makes resource allocation decisions based on Segment income (loss). The Company does not manage its assets by segment; accordingly, total assets are not allocated to the segments. Reinsurance The Company is a leading global (re)insurer, which offers both treaty and facultative reinsurance worldwide through our network of local branches. The Company participates in the broker market for reinsurance treaties written in the United States and Bermuda primarily on a proportional and excess of loss basis. For the Company’s international business, the book consists of treaty, written on both a proportional and excess of loss basis, facultative, and primary business, primarily in Europe, Asia and Latin America. The Reinsurance segment provides coverage in the following product lines: Aviation & Space – Aviation covers loss of or damage to an aircraft and the aircraft operations' liability to passengers, cargo and hull as well as to third parties, and Space covers damage to a satellite during launch and in orbit. Casualty – covers a cross section of all casualty lines, including general liability, umbrella, auto, workers compensation, professional liability, and other specialty classes. Contingency – covers event cancellation and non-appearance. Credit & Bond – covers traditional short-term commercial credit insurance, including pre-agreed domestic and export sales of goods and services with typical coverage periods of 60 to 120 days. Marine & Energy – Marine covers damage to ships and goods in transit, marine liability lines as well as yacht-owner perils. Energy covers offshore energy industry insurance. Mortgage – covers credit risks that compensates insureds for losses arising from mortgage loan defaults. Property – consists of the Company’s underwriting lines of business that offer property catastrophe excess of loss, proportional property reinsurance, per risk property reinsurance, and agriculture reinsurance and property risk and pro rata on a worldwide basis. Property catastrophe excess of loss reinsurance treaties cover losses to a pool of risks from catastrophic events. Property proportional covers both attritional and catastrophic risks, property per risk covers loss to individual risk, and agriculture provides stop-loss reinsurance coverage, including to companies writing U.S. government-sponsored multi-peril crop insurance. Insurance & Services The Company provides insurance products to individuals and corporations directly, through agents/brokers or through delegated underwriting agreements with MGAs. The Company seeks to work with MGAs that have strong underwriting expertise, deep understanding of the customer/product niches and/or technology-driven approaches, and a sustainable competitive moat. Insurance & Services offers a comprehensive set of services for startup MGAs and insurance services companies including risk capital and equity and debt financing. Furthermore, the Company offers expertise in underwriting, pricing and product development to businesses it partners with. The Company’s process to identify and approve partner companies includes alignment of interests, disciplined management and strong oversight, which are believed to be critical for success. The Insurance & Services segment predominantly provides insurance coverage in addition to receiving fees for services provided within Insurance & Services and to third parties. The Company makes both controlling and non-controlling equity investments and debt investments in MGAs and other insurance-related business (collectively, “Strategic Investments”). The Insurance & Services segment provides coverage in the following product lines: Accident and Health (“A&H”) – consists of life, accident and health coverage, and our MGA units (which include ArmadaCorp Capital, LLC (“Armada”) and International Medical Group, Inc. (“IMG”)). Armada’s products are offered in the United States while IMG offers accident, health and travel products on a worldwide basis. Environmental – consists of an environmental insurance book in the U.S. comprised of 4 core products that revolve around pollution coverage, which are premises pollution liability, contractor's pollution/pollution liability and professional liability. Workers' Compensation – consists of state-mandated insurance coverage that provides medical, disability, survivor, burial, and rehabilitation benefits to employees who are injured or killed due to a work-related injury or illness. Other – consists of a cross section of property and casualty lines, including but not limited to property, general liability, excess liability, commercial auto, professional liability, directors and officers, cyber and other specialty classes. Management uses segment income (loss) as the primary basis for assessing segment performance. Segment income (loss) is comprised of two components, underwriting income (loss) and net services income (loss). The Company calculates underwriting income (loss) by subtracting loss and loss adjustment expenses incurred, net, acquisition costs, net, and other underwriting expenses from net premiums earned. Net services income (loss) consists of services revenues (fee for service revenues), services expenses, services non-controlling (income) loss and net investment gains (losses) from Strategic Investments. This definition of segment income (loss) aligns with how business performance is managed and monitored. We continue to evaluate our segments as our business evolves and may further refine our segments and segment income (loss) measures. Certain items are presented in a different manner for segment reporting purposes than in the consolidated statements of income (loss). These items are reconciled to the consolidated presentation in the segment measure reclass column below and include net investment gains (losses) from Strategic Investments where Insurance & Services holds private equity investments. Also included in Insurance & Services segment income (loss) are services noncontrolling loss (income) attributable to minority shareholders on non-wholly-owned subsidiaries. In addition, services revenues and services expenses are reconciled to other revenues and net corporate and other expenses, respectively. Segment results are shown prior to corporate eliminations. Corporate eliminations are included in the elimination column below as necessary to reconcile to underwriting income (loss), net services income (loss), and segment income (loss) to the consolidated statements of income (loss). Corporate includes the results of all runoff business, which represent certain classes of business that the Company no longer actively underwrites, including those that have asbestos and environmental and other latent liability exposures and certain reinsurance contracts that have interest crediting features. In addition, revenue and expenses managed at the corporate level, including realized gains and losses (excluding net investment gains (losses) from Strategic Investments, which are allocated to the Segment results), net realized and unrealized investment gains (losses) from related party investment funds, other investment income, non services-related other revenues, non services-related net corporate and other expenses, intangible asset amortization, interest expense, foreign exchange (gains) losses and income tax (expense) benefit are reported within Corporate. The CEO does not manage segment results or allocate resources to segments when considering these items and they are therefore excluded from our definition of segment income (loss). The following is a summary of the Company’s operating segment results for the years ended December 31, 2022, 2021 and 2020: 2022 Reinsurance Insurance & Services Core Eliminations (2) Corporate Segment Measure Reclass Total Gross premiums written $ 1,521.4 $ 1,884.2 $ 3,405.6 $ — $ 4.1 $ — $ 3,409.7 Net premiums written 1,199.6 1,346.0 2,545.6 — 3.6 — 2,549.2 Net premiums earned 1,213.1 1,086.8 2,299.9 — 18.2 — 2,318.1 Loss and loss adjustment expenses incurred, net 855.9 718.7 1,574.6 (5.2) 19.0 — 1,588.4 Acquisition costs, net 310.3 273.2 583.5 (118.6) (3.0) — 461.9 Other underwriting expenses 113.8 62.8 176.6 — 7.9 — 184.5 Underwriting income (loss) (66.9) 32.1 (34.8) 123.8 (5.7) — 83.3 Services revenue (0.2) 215.7 215.5 (133.4) — (82.1) — Services expenses — 179.2 179.2 — — (179.2) — Net services fee income (loss) (0.2) 36.5 36.3 (133.4) — 97.1 — Services noncontrolling loss — 1.1 1.1 — — (1.1) — Net investment losses from Strategic Investments (3.9) (2.2) (6.1) — — 6.1 — Net services income (loss) (4.1) 35.4 31.3 (133.4) — 102.1 — Segment income (loss) (71.0) 67.5 (3.5) (9.6) (5.7) 102.1 83.3 Net realized and unrealized investment losses (219.4) (6.1) (225.5) Net realized and unrealized investment losses from related party investment funds (210.5) — (210.5) Net investment income 113.3 — 113.3 Other revenues 28.1 82.1 110.2 Net corporate and other expenses (133.6) (179.2) (312.8) Intangible asset amortization (8.1) — (8.1) Interest expense (38.6) — (38.6) Foreign exchange gains 66.0 — 66.0 Income (loss) before income tax benefit $ (71.0) $ 67.5 (3.5) (9.6) (408.5) (1.1) (422.7) Income tax benefit — — 36.7 — 36.7 Net loss (3.5) (9.6) (371.8) (1.1) (386.0) Net income attributable to noncontrolling interests — — (1.9) 1.1 (0.8) Net loss attributable to SiriusPoint $ (3.5) $ (9.6) $ (373.7) $ — $ (386.8) Underwriting Ratios: (1) Loss ratio 70.6 % 66.1 % 68.5 % 68.5 % Acquisition cost ratio 25.6 % 25.1 % 25.4 % 19.9 % Other underwriting expenses ratio 9.4 % 5.8 % 7.7 % 8.0 % Combined ratio 105.6 % 97.0 % 101.6 % 96.4 % (1) Underwriting ratios are calculated by dividing the related expense by net premiums earned. (2) Insurance and Services MGAs recognize fees for service using revenue from contracts with customers accounting standards, whereas insurance companies recognize acquisition expenses using insurance contract accounting standards. While ultimate revenues and expenses recognized will match, there will be recognition timing differences based on the different accounting standards. 2021 Reinsurance Insurance & Services Core Eliminations (2) Corporate Segment Measure Reclass Total Gross premiums written $ 1,350.4 $ 897.9 $ 2,248.3 $ — $ (11.8) $ — $ 2,236.5 Net premiums written 1,124.9 652.8 1,777.7 — (43.5) — 1,734.2 Net premiums earned 1,210.9 522.8 1,733.7 — (16.7) — 1,717.0 Loss and loss adjustment expenses incurred, net 989.4 320.6 1,310.0 (2.6) 19.1 — 1,326.5 Acquisition costs, net 302.7 149.7 452.4 (67.6) 3.0 — 387.8 Other underwriting expenses 105.5 29.2 134.7 — 24.1 — 158.8 Underwriting income (loss) (186.7) 23.3 (163.4) 70.2 (62.9) — (156.1) Services revenue — 133.7 133.7 (82.6) — (51.1) — Services expenses — 120.5 120.5 — — (120.5) — Net services fee income — 13.2 13.2 (82.6) — 69.4 — Services noncontrolling loss — 2.3 2.3 — — (2.3) — Net investment gains (losses) from Strategic Investments 0.3 (4.8) (4.5) — — 4.5 — Net services income 0.3 10.7 11.0 (82.6) — 71.6 — Segment income (loss) (186.4) 34.0 (152.4) (12.4) (62.9) 71.6 (156.1) Net realized and unrealized investment losses (12.4) (4.5) (16.9) Net realized and unrealized investment gains from related party investment funds 304.0 — 304.0 Net investment income 25.4 — 25.4 Other revenues 100.1 51.1 151.2 Net corporate and other expenses (146.1) (120.5) (266.6) Intangible asset amortization (5.9) — (5.9) Interest expense (34.0) — (34.0) Foreign exchange gains 44.0 — 44.0 Income (loss) before income tax benefit $ (186.4) $ 34.0 (152.4) (12.4) 212.2 (2.3) 45.1 Income tax benefit — — 10.7 — 10.7 Net income (loss) (152.4) (12.4) 222.9 (2.3) 55.8 Net loss attributable to noncontrolling interests — — — 2.3 2.3 Net income (loss) available to SiriusPoint $ (152.4) $ (12.4) $ 222.9 $ — $ 58.1 Underwriting Ratios: (1) Loss ratio 81.7 % 61.3 % 75.6 % 77.3 % Acquisition cost ratio 25.0 % 28.6 % 26.1 % 22.6 % Other underwriting expenses ratio 8.7 % 5.6 % 7.8 % 9.2 % Combined ratio 115.4 % 95.5 % 109.5 % 109.1 % (1) Underwriting ratios are calculated by dividing the related expense by net premiums earned. (2) Insurance and Services MGAs recognize fees for service using revenue from contracts with customers accounting standards, whereas insurance companies recognize acquisition expenses using insurance contract accounting standards. While ultimate revenues and expenses recognized will match, there will be recognition timing differences based on the different accounting standards. 2020 Reinsurance Insurance & Services Core Eliminations (2) Corporate Segment Measure Reclass Total Gross premiums written $ 534.1 $ 25.5 $ 559.6 $ — $ 28.9 $ — $ 588.5 Net premiums written 497.3 16.0 513.3 — 28.9 — 542.2 Net premiums earned 575.6 7.1 582.7 — 28.1 — 610.8 Loss and loss adjustment expenses incurred, net 459.5 5.9 465.4 — (0.1) — 465.3 Acquisition costs, net 160.4 1.4 161.8 (0.1) 25.4 — 187.1 Other underwriting expenses 24.0 0.2 24.2 — 5.9 — 30.1 Underwriting loss (68.3) (0.4) (68.7) 0.1 (3.1) — (71.7) Services revenue — 1.7 1.7 (1.7) — — — Services expenses — 1.0 1.0 — — (1.0) — Net services fee income — 0.7 0.7 (1.7) — 1.0 — Services noncontrolling income — (0.3) (0.3) — — 0.3 — Net services income — 0.4 0.4 (1.7) — 1.3 — Segment loss (68.3) — (68.3) (1.6) (3.1) 1.3 (71.7) Net realized and unrealized investment gains 69.2 — 69.2 Net realized and unrealized investment gains from related party investment funds 195.0 — 195.0 Net investment income 14.7 — 14.7 Net corporate and other expenses (40.9) (1.0) (41.9) Interest expense (8.2) — (8.2) Foreign exchange losses (5.2) — (5.2) Income (loss) before income tax expense $ (68.3) $ — (68.3) (1.6) 221.5 0.3 151.9 Income tax expense — — (8.1) — (8.1) Net income (loss) (68.3) (1.6) 213.4 0.3 143.8 Net income attributable to noncontrolling interests — — — (0.3) (0.3) Net income (loss) available to SiriusPoint $ (68.3) $ (1.6) $ 213.4 $ — $ 143.5 Underwriting Ratios: (1) Loss ratio 79.8 % 83.1 % 79.9 % 76.2 % Acquisition cost ratio 27.9 % 19.7 % 27.8 % 30.6 % Other underwriting expenses ratio 4.2 % 2.8 % 4.2 % 4.9 % Combined ratio 111.9 % 105.6 % 111.9 % 111.7 % (1) Underwriting ratios are calculated by dividing the related expense by net premiums earned. (2) Insurance and Services MGAs recognize fees for service using revenue from contracts with customers accounting standards, whereas insurance companies recognize acquisition expenses using insurance contract accounting standards. While ultimate revenues and expenses recognized will match, there will be recognition timing differences based on the different accounting standards. The following tables provide a breakdown of ne t premiums written by client location and underwriting location by reportable segment for the years ended December 31, 2022, 2021 and 2020: 2022 Reinsurance Insurance & Services Corporate Total Net written premiums by client location: United States and Canada $ 746.9 $ 1,139.5 $ 0.5 $ 1,886.9 Europe 241.6 120.5 3.1 365.2 Bermuda, the Caribbean and Latin America 171.4 54.6 — 226.0 Asia and Other 39.7 31.4 — 71.1 Total net written premiums by client location $ 1,199.6 $ 1,346.0 $ 3.6 $ 2,549.2 Net written premiums by underwriting location: United States and Canada $ 569.2 $ 931.3 $ 0.5 $ 1,501.0 Europe 384.4 255.0 0.4 639.8 Bermuda, the Caribbean and Latin America 243.6 159.7 2.7 406.0 Asia and Other 2.4 — — 2.4 Total net written premiums by underwriting location $ 1,199.6 $ 1,346.0 $ 3.6 $ 2,549.2 2021 Reinsurance Insurance & Services Corporate Total Net written premiums by client location: United States and Canada $ 579.1 $ 560.3 $ 1.6 $ 1,141.0 Europe 309.5 36.4 (45.8) 300.1 Bermuda, the Caribbean and Latin America 114.3 13.7 — 128.0 Asia and Other 122.0 42.4 0.7 165.1 Total net written premiums by client location $ 1,124.9 $ 652.8 $ (43.5) $ 1,734.2 Net written premiums by underwriting location: United States and Canada $ 447.1 $ 408.9 $ 1.6 $ 857.6 Europe 379.8 93.0 (17.5) 455.3 Bermuda, the Caribbean and Latin America 246.1 150.9 (27.9) 369.1 Asia and Other 51.9 — 0.3 52.2 Total net written premiums by underwriting location $ 1,124.9 $ 652.8 $ (43.5) $ 1,734.2 2020 Reinsurance Insurance & Services Corporate Total Net written premiums by client location: United States and Canada $ 300.1 $ 13.8 $ — $ 313.9 Europe 83.7 1.9 28.9 114.5 Bermuda, the Caribbean and Latin America 108.6 — — 108.6 Asia and Other 4.9 0.3 — 5.2 Total net written premiums by client location $ 497.3 $ 16.0 $ 28.9 $ 542.2 Net written premiums by underwriting location: United States and Canada $ 236.3 $ 4.9 $ — $ 241.2 Bermuda, the Caribbean and Latin America 261.0 11.1 28.9 301.0 Total net written premiums by underwriting location $ 497.3 $ 16.0 $ 28.9 $ 542.2 No contract contributed more than 10% of gross premiums written for the years ended December 31, 2022, 2021 and 2020.

Cash, cash equivalents, restric

Cash, cash equivalents, restricted cash and restricted investments	12 Months Ended
	Dec. 31, 2022
Cash and Cash Equivalents [Abstract]
Cash, cash equivalents, restricted cash and restricted investments	5. Cash, cash equivalents, restricted cash and restricted investments The following table provides a summary of cash and cash equivalents, restricted cash and restricted investments as of December 31, 2022 and 2021: December 31, December 31, 2021 Cash and cash equivalents $ 705.3 $ 999.8 Restricted cash securing letter of credit facilities (1) 34.3 500.2 Restricted cash securing reinsurance contracts (2) 148.9 431.8 Restricted cash held by managing general underwriters 25.2 16.6 Total cash, cash equivalents and restricted cash (3) 913.7 1,948.4 Restricted investments securing reinsurance contracts and letter of credit facilities (1) (2) (4) 2,202.2 1,107.0 Total cash, cash equivalents, restricted cash and restricted investments $ 3,115.9 $ 3,055.4 (1) Restricted cash and restricted investments securing letter of credit facilities primarily pertains to letters of credit that have been issued to the Company’s clients in support of our obligations under reinsurance contracts. The Company will not be released from the obligation to provide these letters of credit until the reserves underlying the reinsurance contracts have been settled. The time period for which the Company expects each letter of credit to be in place varies from contract to contract but can last several years. (2) Restricted cash and restricted investments securing reinsurance contracts pertain to trust accounts securing the Company’s contractual obligations under certain reinsurance contracts that the Company will not be released from until the underlying risks have expired or have been settled. Restricted investments include certain investments in debt securities, short-term investments and limited partnership interests in Third Point Enhanced LP. The time period for which the Company expects these trust accounts to be in place varies from contract to contract, but can last several years. (3) Cash, cash equivalents and restricted cash as reported in the Company’s consolidated statements of cash flows. (4) Restricted investments include required deposits with certain insurance state regulatory agencies in order to maintain insurance licenses.

Fair value measurements

Fair value measurements	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair value measurements	6. Fair value measurements U.S. GAAP disclosure requirements establish a framework for measuring fair value, including a three-level hierarchy for fair value measurements based upon the transparency of inputs to the valuation of an asset or liability. The three-level hierarchy of inputs is summarized below: • Level 1 – Quoted prices available in active markets/exchanges for identical investments as of the reporting date. • Level 2 – Observable inputs to the valuation methodology other than unadjusted quoted market prices for identical assets or liabilities in active markets. Level 2 inputs include, but are not limited to, prices quoted for similar assets or liabilities in active markets/exchanges, prices quoted for identical or similar assets or liabilities in markets that are not active and fair values determined through the use of models or other valuation methodologies. • Level 3 – Inputs are based all or in part on significant unobservable inputs for the investment, and include situations where there is little, if any, market activity for the investment. The inputs applied in the determination of fair value require significant management judgment and estimation. Inputs refer broadly to the assumptions that market participants would use in pricing the asset or liability, including assumptions about risk. For example, the risk inherent in a particular valuation technique used to measure fair value including such a pricing model and/or the risk inherent in the inputs to the valuation technique. Inputs may be observable or unobservable. Observable inputs are inputs that reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from sources other than those of the reporting entity. Unobservable inputs are inputs that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and considers factors specific to the investment. The following tables present the Company’s investments, categorized by the level of the fair value hierarchy as of December 31, 2022 and 2021: 2022 Quoted prices in active markets Significant other observable inputs Significant unobservable inputs Total (Level 1) (Level 2) (Level 3) Assets Asset-backed securities $ — $ 230.7 $ — $ 230.7 Residential mortgage-backed securities — 340.7 — 340.7 Commercial mortgage-backed securities — 61.2 — 61.2 Corporate debt securities — 415.7 — 415.7 U.S. government and government agency 1,546.2 4.4 — 1,550.6 Non-U.S. government and government agency 5.0 31.6 — 36.6 Total debt securities, available for sale 1,551.2 1,084.3 — 2,635.5 Asset-backed securities — 553.7 — 553.7 Residential mortgage-backed securities — 133.6 — 133.6 Commercial mortgage-backed securities — 113.4 — 113.4 Corporate debt securities — 363.5 — 363.5 U.S. government and government agency 264.1 6.3 — 270.4 Non-U.S. government and government agency 8.7 79.5 — 88.2 Preferred stocks — — 3.2 3.2 Total debt securities, trading 272.8 1,250.0 3.2 1,526.0 Total equity securities 1.6 — — 1.6 Short-term investments 972.8 11.8 — 984.6 Other long-term investments — — 227.3 227.3 Derivative assets — — 9.5 9.5 $ 2,798.4 $ 2,346.1 $ 240.0 5,384.5 Cost and equity method investments 104.8 Investments in funds valued at NAV 173.9 Total assets $ 5,663.2 Liabilities Total securities sold, not yet purchased $ 27.0 $ — $ — $ 27.0 Securities sold under an agreement to repurchase — 18.0 — 18.0 Liability-classified capital instruments — 39.0 21.4 60.4 Derivative liabilities — — 8.6 8.6 Total liabilities $ 27.0 $ 57.0 $ 30.0 $ 114.0 2021 Quoted prices in active markets Significant other observable inputs Significant unobservable inputs Total (Level 1) (Level 2) (Level 3) Assets Asset-backed securities $ — $ 513.1 $ — $ 513.1 Residential mortgage-backed securities — 301.9 — 301.9 Commercial mortgage-backed securities — 147.3 — 147.3 Corporate debt securities — 602.6 — 602.6 U.S. Government and government agency 360.9 24.5 — 385.4 Non-U.S. government and government agency 17.8 114.5 — 132.3 U.S. States, municipalities, and political subdivision — 0.2 — 0.2 Preferred stocks — — 2.8 2.8 Total debt securities, trading 378.7 1,704.1 2.8 2,085.6 Fixed income mutual funds 2.1 — — 2.1 Common stocks 0.7 — — 0.7 Total equity securities 2.8 — — 2.8 Short-term investments 1,073.2 2.6 — 1,075.8 Other long-term investments — — 262.0 262.0 Derivative assets 0.2 — 0.4 0.6 $ 1,454.9 $ 1,706.7 $ 265.2 3,426.8 Cost and equity method investments 89.2 Investments in funds valued at NAV 1,014.5 Total assets $ 4,530.5 Liabilities Liability-classified capital instruments $ — $ 30.6 $ 57.2 $ 87.8 Derivative liabilities — — 3.2 3.2 Total liabilities $ — $ 30.6 $ 60.4 $ 91.0 During the years ended December 31, 2022 and December 31, 2021 the Company did not reclassify its assets or liabilities between Levels 2 and 3. Valuation techniques The Company uses outside pricing services to assist in determining fair values for its investments. For investments in active markets, the Company uses the quoted market prices provided by outside pricing services to determine fair value. In circumstances where quoted market prices are unavailable or are not considered reasonable, the Company estimates the fair value using industry standard pricing models and observable inputs such as benchmark yields, reported trades, broker-dealer quotes, issuer spreads, benchmark securities, bids, offers, prepayment speeds, reference data including research publications, and other relevant inputs. Given that many debt securities do not trade on a daily basis, the outside pricing services evaluate a wide range of fixed maturity investments by regularly drawing parallels from recent trades and quotes of comparable securities with similar features. The characteristics used to identify comparable debt securities vary by asset type and take into account market convention. The techniques and inputs specific to asset classes within the Company’s debt securities and short-term investments for Level 2 securities that use observable inputs are as follows: Asset-backed and mortgage-backed securities The fair value of mortgage and asset-backed securities is primarily priced by pricing services using a pricing model that uses information from market sources and leveraging similar securities. Key inputs include benchmark yields, reported trades, underlying tranche cash flow data, collateral performance, plus new issue data, as well as broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data including issuer, vintage, loan type, collateral attributes, prepayment speeds, default rates, recovery rates, cash flow stress testing, credit quality ratings and market research publications. Corporate debt securities Corporate debt securities consist primarily of investment-grade debt of a wide variety of U.S. and non-U.S. corporate issuers and industries. The corporate fixed maturity investments are primarily priced by pricing services. When evaluating these securities, the pricing services gather information from market sources regarding the issuer of the security and obtain credit data, as well as other observations, from markets and sector news. Evaluations are updated by obtaining broker dealer quotes and other market information including actual trade volumes, when available. The pricing services also consider the specific terms and conditions of the securities, including any specific features which may influence risk. U.S. government and government agency U.S. government and government agency securities consist primarily of debt securities issued by the U.S. Treasury and mortgage pass-through agencies such as the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and the Government National Mortgage Association. Fixed maturity investments included in U.S. government and government agency securities are primarily priced by pricing services. When evaluating these securities, the pricing services gather information from market sources and integrate other observations from markets and sector news. Evaluations are updated by obtaining broker dealer quotes and other market information including actual trade volumes, when available. The fair value of each security is individually computed using analytical models which incorporate option adjusted spreads and other daily interest rate data. Non-U.S. government and government agency Non-U.S. government and government agency securities consist of debt securities issued by non-U.S. governments and their agencies along with supranational organizations (also known as sovereign debt securities). Securities held in these sectors are primarily priced by pricing services who employ proprietary discounted cash flow models to value the securities. Key quantitative inputs for these models are daily observed benchmark curves for treasury, swap and high issuance credits. The pricing services then apply a credit spread for each security which is developed by in-depth and real time market analysis. For securities in which trade volume is low, the pricing services utilize data from more frequently traded securities with similar attributes. These models may also be supplemented by daily market and credit research for international markets. U.S. states, municipalities, and political subdivisions The U.S. states, municipalities and political subdivisions portfolio contains debt securities issued by U.S. domiciled state and municipal entities. These securities are generally priced by independent pricing services using the techniques for U.S. government and government agency securities. Preferred stocks The fair value of preferred stocks is generally priced by independent pricing services using an evaluated pricing model that calculates the appropriate spread over a comparable security for each issue. Key inputs include exchange prices (underlying and common stock of same issuer), benchmark yields, reported trades, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including sector, coupon, credit quality ratings, duration, credit enhancements, early redemption features and market research publications. Short-term investments Short-term investments consist of U.S. treasury bills, certificates of deposit and other securities, which, at the time of purchase, mature within a period of greater than three months but less than one year. These investments are generally priced by independent pricing services using the techniques described for U.S. government and government agency securities and Corporate debt securities described above. Investments measured using Net Asset Value The Company values its investments in limited partnerships, including its investments in related party investment funds, at fair value. The Company has elected the practical expedient for fair value for these investments which is estimated based on the Company’s share of the NAV of the limited partnerships, as provided by the independent fund administrator, as the Company believes it represents the most meaningful measurement basis for the investment assets and liabilities. The NAV represents the Company’s proportionate interest in the members’ equity of the limited partnerships. The fair value of the Company's investments in certain hedge funds and certain private equity funds are also determined using NAV. The hedge fund's administrator provides quarterly updates of fair value in the form of the Company's proportional interest in the underlying fund's NAV, which is deemed to approximate fair value, generally with a three month delay in valuation. The private equity funds provide monthly, quarterly or semi-annual partnership capital statements primarily with a one or three month delay which are used as a basis for valuation. These private equity investments vary in investment strategies and are not actively traded in any open markets. Due to a lag in reporting, some of the fund managers, fund administrators, or both, are unable to provide final fund valuations as of the Company's reporting date. This includes utilizing preliminary estimates reported by its fund managers and using other information that is available to the Company with respect to the underlying investments, as necessary. In order to assess the reasonableness of the NAVs, the Company performs a number of monitoring procedures on a monthly, quarterly and annual basis, to assess the quality of the information provided by the investment manager and fund administrator underlying the preparation of the NAV. These procedures include, but are not limited to, regular review and discussion of the fund’s performance with the investment manager. These investments are included in investment in funds valued at NAV and excluded from the presentation of investments categorized by the level of the fair value hierarchy. Level 3 Investments Level 3 valuations are generated from techniques that use assumptions not observable in the market. These unobservable assumptions reflect the Company's assumptions, that market participants would use in valuing the investment. Generally, certain securities may start out as Level 3 when they are originally issued but as observable inputs become available in the market, they may be reclassified to Level 2. The Company employs a number of procedures to assess the reasonableness of the fair value measurements for its other long-term investments, including obtaining and reviewing the audited annual financial statements of hedge funds and private equity funds and periodically discussing each fund's pricing with the fund manager. However, since the fund managers do not provide sufficient information to evaluate the pricing inputs and methods for each underlying investment, the inputs are considered to be unobservable. The fair values of the Company's investments in private equity securities, private debt instruments, certain private equity funds, and certain hedge funds have been classified as Level 3 measurements. Private equity securities and private debt instruments are initially valued based on transaction price and their valuation is subsequently estimated based on available evidence such as a market transaction in similar instruments and other financial information for the issuer. For Strategic Investments carried at fair value, management either engages a third-party valuation specialist to assist in determination of the fair value based on commonly accepted valuation methods (i.e., income approach, market approach) as of the valuation date or performs valuation internally. In addition, investors fair value analyses prepared by third party valuation specialists working with Strategic Investment operating management are referenced where available. See Note 10 for additional information on the fair values of derivative financial instruments used for both risk management and investment purposes. Underwriting-related derivatives Underwriting-related derivatives include reinsurance contracts that are accounted for as derivatives. These derivative contracts are initially valued at cost which approximates fair value. In subsequent measurement periods, the fair values of these derivatives are determined using internally developed discounted cash flow models. As the significant inputs used to price these derivatives are unobservable, the fair values of these contracts are classified as Level 3. The following table presents the reconciliation of all investments measured at fair value using Level 3 inputs for the years ended December 31, 2022: January 1, Transfers in to (out of) Level 3 Purchases Sales Realized and Unrealized Gains (Losses) (1) Change in Unrealized Gains (Losses) in OCI December 31, Assets Preferred stocks $ 2.8 $ — $ — $ — $ 0.4 $ — $ 3.2 Other long-term investments 262.1 — 2.1 (24.7) (12.2) — 227.3 Derivative assets 0.4 — 43.3 — (34.2) — 9.5 Total assets $ 265.3 $ — $ 45.4 $ (24.7) $ (46.0) $ — $ 240.0 Liabilities Liability-classified capital instruments $ (57.2) $ — $ — $ — $ 35.8 $ — $ (21.4) Derivative liabilities (3.2) — — (3.4) (2.0) — (8.6) Total liabilities $ (60.4) $ — $ — $ (3.4) $ 33.8 $ — $ (30.0) (1) Total change in realized and unrealized gains (losses) recorded on Level 3 financial instruments is included in total realized and unrealized investment gains (losses) and net investment income in the consolidated statements of income (loss). Realized and unrealized gains (losses) related to underwriting-related derivative assets and liabilities are included in other underwriting expenses, net of foreign exchange (gains) losses, in the consolidated statements of income (loss). The following table presents the reconciliation of all investments measured at fair value using Level 3 inputs for the year ended December 31, 2021: January 1, Transfers in to (out of) Level 3 Purchases Assets Acquired (1) Sales Realized and Unrealized Gains (Losses) (2) December 31, Assets Preferred stocks $ — $ — $ 10.0 $ 2.8 $ (10.0) $ — $ 2.8 Other long-term investments 4.0 — 71.2 216.6 (24.9) (4.8) 262.1 Derivative assets 1.2 (1.2) — 0.3 (1.4) 1.5 0.4 Loan participations — — 9.0 32.8 (42.8) 1.0 — Total assets $ 5.2 $ (1.2) $ 90.2 $ 252.5 $ (79.1) $ (2.3) $ 265.3 Liabilities Liability-classified capital instruments $ — $ 27.0 $ (137.6) $ — $ — $ 53.4 $ (57.2) Contingent consideration liabilities — — — (0.7) 1.9 (1.2) — Derivative liabilities (1.0) 1.2 (0.4) (2.0) — (1.0) (3.2) Total liabilities $ (1.0) $ 28.2 $ (138.0) $ (2.7) $ 1.9 $ 51.2 $ (60.4) (1) Includes amounts acquired as a result of the Sirius Group acquisition. (2) Total change in realized and unrealized gains (losses) recorded on Level 3 financial instruments is included in total realized and unrealized investment gains (losses) and net investment income in the consolidated statements of income (loss). Realized and unrealized gains (losses) related to underwriting-related derivative assets and liabilities are included in other underwriting expenses, net of foreign exchange (gains) losses, in the consolidated statements of income (loss). For assets and liabilities that were transferred into Level 3 during the period, gains (losses) are presented as if the assets or liabilities had been transferred into Level 3 at the beginning of the period; similarly, for assets and liabilities that were transferred out of Level 3 during the period, gains (losses) are presented as if the assets or liabilities had been transferred out of Level 3 at the beginning of the period. Financial instruments disclosed, but not carried at fair value The Company uses various financial instruments in the normal course of its business. The carrying values of cash, accrued investment income, certain other assets, certain other liabilities, and other financial instruments not included in the table below approximated their fair values as of December 31, 2022 and 2021, due to their respective short maturities. The following table includes financial instruments for which the carrying value differs from the estimated fair values as of December 31, 2022 and 2021. The fair values of the below financial instruments are based on observable inputs and are considered Level 2 measurements. December 31, 2022 December 31, 2021 Fair Value Carrying Value Fair Value Carrying Value 2017 SEK Subordinated Notes $ 259.0 $ 258.6 $ 302.3 $ 296.3 2016 SIG Senior Notes 343.7 404.8 412.8 406.0 2015 Senior Notes 112.6 114.6 120.5 114.4 Series B preference shares $ 186.0 $ 200.0 $ 220.9 $ 200.0

Investments

Investments	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Investments	7. Investments The Company’s invested assets consist of investment securities and other long-term investments held for general investment purposes. The portfolio of investment securities includes debt securities held for trading, debt securities available for sale, short-term investments, equity securities, and other long-term investments which are classified as trading securities with the exception of debt securities held as available for sale. Realized investment gains and losses on debt securities are reported in pre-tax revenues. Unrealized investment gains and losses on debt securities are reported based on classification. Trading securities flow through pre-tax revenues whereas securities classified as available for sale flow through other comprehensive income (loss). For debt securities classified as available for sale for which a decline in the fair value between the amortized cost is due to credit-related factors, an allowance is established for the difference between the estimated recoverable value and amortized cost with a corresponding impact to the consolidated statements of income (loss). The allowance is limited to the difference between amortized cost and fair value. A credit losses impairment assessment is performed on securities with both quantitative and qualitative factors. Qualitative factors include significant declines in fair value below amortized cost. Additionally, a qualitative assessment is also performed over debt securities to evaluate potential credit losses. Examples of qualitative indicators include issuer credit downgrades as well as changes to credit spreads. Declines in fair value related to a debt security that do not relate to a credit loss are recorded as a component of accumulated other comprehensive income (loss). Debt securities The following tables provide the cost or amortized cost, gross unrealized investment gains (losses), net foreign currency gains (losses), and fair value of the Company's debt securities as of December 31, 2022 and 2021: December 31, 2022 Cost or Gross Gross unrealized losses (3) Net foreign Fair value Debt securities, available for sale Asset-backed securities $ 234.1 $ 0.9 $ (4.3) $ — $ 230.7 Residential mortgage-backed securities 354.3 0.3 (13.9) — 340.7 Commercial mortgage-backed securities 62.1 — (0.9) — 61.2 Corporate debt securities 428.5 0.5 (13.1) (0.2) 415.7 U.S. government and government agency (1) 1,561.9 3.2 (14.5) — 1,550.6 Non-U.S. government and government agency 37.2 — (0.7) 0.1 36.6 Total debt securities, available for sale (2)(3) $ 2,678.1 $ 4.9 $ (47.4) $ (0.1) $ 2,635.5 Debt securities, trading Asset-backed securities $ 575.5 $ 0.1 $ (21.9) $ — $ 553.7 Residential mortgage-backed securities 155.9 — (22.3) — 133.6 Commercial mortgage-backed securities 130.5 — (17.1) — 113.4 Corporate debt securities 391.4 — (27.2) (0.7) 363.5 U.S. government and government agency (1) 278.6 — (8.2) — 270.4 Non-U.S. government and government agency 95.8 — (4.0) (3.6) 88.2 Preferred stocks 2.4 0.8 — — 3.2 Total debt securities, trading $ 1,630.1 $ 0.9 $ (100.7) $ (4.3) $ 1,526.0 December 31, 2021 Cost or Gross Gross Net foreign Fair value Asset-backed securities $ 512.6 $ 0.9 $ (0.4) $ — $ 513.1 Residential mortgage-backed securities 306.5 — (4.6) — 301.9 Commercial mortgage-backed securities 148.4 0.6 (1.7) — 147.3 Corporate debt securities 605.5 0.6 (3.5) — 602.6 U.S. government and government agency (1) 388.1 0.1 (2.8) — 385.4 Non-U.S. government and government agency 135.4 0.3 (2.6) (0.8) 132.3 U.S. states, municipalities and political subdivision 0.2 — — — 0.2 Preferred stocks 2.6 0.2 — — 2.8 Total debt securities (2)(3) $ 2,099.3 $ 2.7 $ (15.6) $ (0.8) $ 2,085.6 (1) The Company had $27.0 million short positions in long duration U.S. Treasuries as of December 31, 2022 (As of December 31, 2021, there were no short positions in long duration U.S. Treasuries). These amounts are included in securities sold, not yet purchased in the consolidated balance sheets. (2) As of December 31, 2022, all debt securities classified as available for sale that are in a gross unrealized loss position have been in a gross unrealized loss position for less than 12 months. As of December 31, 2021, there were no debt securities classified as available for sale. (3) As of December 31, 2022, the Company did not record an allowance for credit losses on the AFS portfolio. As of December 31, 2021, there were no debt securities classified as available for sale. The weighted average duration of the Company's debt securities, net of short positions in U.S. treasuries, as of December 31, 2022 was approximately 1.8 years, including short-term investments (2021 - 1.6 years). The following table provides the cost or amortized cost and fair value of the Company's debt securities bifurcated into debt securities held for trading (“trading”) and AFS as of December 31, 2022 and 2021 by contractual maturity. Actual maturities could differ from contractual maturities because borrowers may have the right to call or prepay certain obligations with or without call or prepayment penalties. December 31, 2022 December 31, 2021 Debt securities, trading Debt securities, AFS Debt securities, trading Cost or Fair value Cost or Fair value Cost or Fair value Due in one year or less $ 240.4 $ 230.9 $ 104.2 $ 104.0 $ 145.6 $ 145.1 Due after one year through five years 426.5 407.0 1,822.7 1,802.0 870.4 862.4 Due after five years through ten years 63.4 55.7 95.8 92.3 69.6 68.6 Due after ten years 35.5 28.5 4.9 4.6 43.6 44.4 Mortgage-backed and asset-backed securities 861.9 800.7 650.5 632.6 967.5 962.3 Preferred stocks 2.4 3.2 — — 2.6 2.8 Total debt securities $ 1,630.1 $ 1,526.0 $ 2,678.1 $ 2,635.5 $ 2,099.3 $ 2,085.6 (1) As of December 31, 2021, there were no debt securities classified as available for sale. The following table summarizes the ratings and fair value of debt securities held in the Company's investment portfolio as of December 31, 2022 and 2021: 2022 2021 Debt securities, trading Debt securities, AFS Debt securities, trading AAA $ 564.4 $ 172.8 $ 696.4 AA 523.2 1,907.6 884.1 A 181.1 188.9 278.5 BBB 158.1 149.9 153.1 Other 99.2 216.3 73.5 Total debt securities (1)(2) $ 1,526.0 $ 2,635.5 $ 2,085.6 (1) Credit ratings are assigned based on the following hierarchy: 1) Standard & Poor's ("S&P") and 2) Moody's Investors Service. (2) As of December 31, 2021, there were no debt securities classified as available for sale. As of December 31, 2022 , the above totals includ ed $95.3 million of sub-prime securities. Of this total, $56.1 million were rated AAA, $20.0 million rated AA and $19.2 million were unrated. As of December 31, 2021, the above totals included $51.8 million of sub-prime securities. Of this total, $35.1 million were rated AAA, $16.1 million rated AA and $0.6 million rated A. Equity securities and other long-term investments The cost or amortized cost, gross unrealized investment gains and losses, net foreign currency gains, and fair values of the Company’s equity securities and other long-term investments as of December 31, 2022 and 2021 were as follows: Cost or Gross Gross Net foreign Fair value December 31, 2022 Equity securities $ 1.8 $ — $ (0.2) $ — $ 1.6 Other long-term investments $ 392.0 $ 27.5 $ (41.8) $ (0.5) $ 377.2 December 31, 2021 Equity securities $ 4.5 $ 0.1 $ (2.0) $ 0.2 $ 2.8 Other long-term investments $ 443.0 $ 28.9 $ (16.8) $ 1.0 $ 456.1 The carrying value of other long-term investments as of December 31, 2022 and 2021 were as follows: December 31, December 31, 2021 Hedge funds and private equity funds (1) $ 84.9 $ 195.7 Strategic Investments (2) 262.0 215.3 Other investments (2) 30.3 45.1 Total other long-term investments $ 377.2 $ 456.1 (1) Includes $45.1 million of investments carried at NAV (December 31, 2021 - $115.2 million) and $25.1 million of investments classified as Level 3 (December 31, 2021 - $80.5 million) within the fair value hierarchy. (2) As of December 31, 2022, the Company had $16.0 million of unfunded commitments relating to these investments (December 31, 2021 - $13.8 million). Hedge funds and private equity funds The Company holds investments in hedge funds and private equity funds, which are included in other long-term investments. The following table summarizes investments in hedge funds and private equity interests by investment objective and sector as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Fair value Unfunded Fair value Unfunded Hedge funds Long/short multi-sector $ 8.8 $ — $ 19.8 $ — Distressed mortgage credit — — 24.6 — Private credit 20.7 — 24.2 — Other 0.2 — 1.7 — Total hedge funds 29.7 — 70.3 — Private equity funds Energy infrastructure & services 10.2 5.0 48.4 19.0 Multi-sector 6.6 5.1 10.1 5.1 Healthcare 19.9 0.3 31.0 2.2 Life settlement 13.6 — 12.9 — Manufacturing/Industrial — — 19.9 — Private equity secondaries 0.4 0.1 0.5 0.4 Other 4.5 21.0 2.6 — Total private equity funds 55.2 31.5 125.4 26.7 Total hedge and private equity funds included in other long-term investments $ 84.9 $ 31.5 $ 195.7 $ 26.7 (1) The table excludes the Company’s investments in TP Enhanced Fund, TP Venture Fund and TP Venture Fund II. See “Investment in related party investment funds” below for additional information. Redemption of investments in certain hedge funds is subject to restrictions including lock-up periods where no redemptions or withdrawals are allowed, restrictions on redemption frequency, and advance notice periods for redemptions. Amounts requested for redemptions remain subject to market fluctuations until the redemption effective date, which generally falls at the end of the defined redemption period. The following summarizes the December 31, 2022 fair value of hedge funds subject to restrictions on redemption frequency and advance notice period requirements for investments in active hedge funds: Notice Period Redemption Frequency 1-29 days 30-59 days 60-89 days 90-119 days 120+ days Total Quarterly $ — $ 0.1 $ 8.7 $ 0.1 $ — $ 8.9 Semi-annual — — 0.1 — — 0.1 Annual — — — 0.1 20.6 20.7 Total $ — $ 0.1 $ 8.8 $ 0.2 $ 20.6 $ 29.7 Certain of the hedge fund and private equity fund investments in which the Company is invested are no longer active and are in the process of disposing of their underlying investments. Distributions from such funds are remitted to investors as the fund's underlying investments are liquidated. As of December 31, 2022 , $6.3 million in distributions were outstanding from these investments. Investments in private equity and other investment funds may be subject to a “lock-up" or commitment period during which investors may not request a redemption prior to the expected termination date. Distributions prior to the expected termination date of the fund may be limited to dividends or proceeds arising from the liquidation of the fund's underlying investments. In addition, certain private equity funds provide an option to extend the lock-up or commitment periods at either the sole discretion of the fund manager or upon agreement between the fund and the investors. As of December 31, 2022, investments in private equity funds were subject to lock-up periods as follows: 1 - 3 years 3 – 5 years 5 – 10 years Total Private equity funds – expected lock-up or commitment period remaining $ 19.5 $ 19.9 $ 15.8 $ 55.2 Investment in related party investment funds The following table provides the fair value of the Company's investments in related party investment funds as of December 31, 2022 and 2021: December 31, December 31, 2021 Third Point Enhanced LP $ 100.3 $ 878.2 Third Point Venture Offshore Fund I LP 26.0 31.4 Third Point Venture Offshore Fund II LP 2.5 — Investments in related party investment funds, at fair value $ 128.8 $ 909.6 Investment in Third Point Enhanced LP On February 23, 2022, the Company entered into the Fourth Amended and Restated Exempted Limited Partnership Agreement of Third Point Enhanced LP (“ TP Enhanced Fund ”) with Third Point Advisors LLC (“TP GP”) and the other parties thereto (the “2022 LPA”), which amended and restated the Third Amended and Restated Exempted Limited Partnership Agreement dated August 6, 2020 (the “2020 LPA”). The TP Enhanced Fund investment strategy, as implemented by Third Point LLC, is intended to achieve superior risk-adjusted returns by deploying capital in both long and short investments with favorable risk/reward characteristics across select asset classes, sectors and geographies. Third Point LLC identifies investment opportunities via a bottom-up, value-oriented approach to single security analysis supplemented by a top-down view of portfolio and risk management. Third Point LLC seeks dislocations in certain areas of the capital markets or in the pricing of particular securities and supplements single security analysis with an approach to portfolio construction that includes sizing each investment based on upside/downside calculations, all with a view towards appropriately positioning and managing overall exposures. The 2020 LPA was amended and restated to, among other things: • add the right to withdraw the Company’s capital accounts in TP Enhanced Fund as of any month-end in accordance with an agreed withdrawal schedule to be reinvested in, or contractually committed to, the Third Point Optimized Credit portfolio (the “TPOC Portfolio”), or other Third Point strategies (“TPE Withdrawn Amounts”); • remove restrictions on the Company’s withdrawal rights following a change of control with respect to the Company; • authorize the Company’s Chief Investment Officer to exercise all decisions under the 2022 LPA, without the need for separate approval from the Investment Committee of the Company’s Board of Directors; • provide that the Company may amend the investment guidelines of the 2022 LPA from time to time for risk management purposes in consultation with TP GP; • provide that the Company and TP GP may discuss the adoption of new risk parameters for TP Enhanced Fund from time to time, and TP GP will work with the Company to create additional risk management guidelines responsive to the Company’s needs that do not fundamentally alter the general investment strategy or investment approach of TP Enhanced Fund ; • provide that the Company may increase or decrease TP Enhanced Fund ’s leverage targets upon reasonable prior notice to meet the business needs of the Company; and • revise the “cause event” materiality qualifier with respect to violations of law related to Third Point LLC’s investment-related business and Third Point LLC being subject to regulatory proceedings to include events that will likely have a material adverse effect on Third Point LLC’s ability to provide investment management services to TP Enhanced Fund and/or the TPOC Portfolio. All other material terms of the 2022 LPA remain consistent with the 2020 LPA. Amended and Restated Investment Management Agreement On February 23, 2022, the Company entered into an Amended and Restated Investment Management Agreement (the “2022 IMA”) with Third Point LLC and the other parties thereto, which amended and restated the Investment Management Agreement dated August 6, 2020. Pursuant to the 2022 IMA, Third Point LLC provides discretionary investment management services with respect to a newly established TPOC Portfolio, subject to investment and risk management guidelines, and continues to provide certain non-discretionary investment advisory services to the Company. The Company agreed to contribute to the TPOC Portfolio amounts withdrawn from TP Enhanced Fund on January 31, 2022 that were not invested or committed for investment in other Third Point strategies. The 2022 IMA contains revised term and termination rights, withdrawal rights, incentive fees, management fees, investment guidelines and advisory fees. For the investment management services provided in respect of the TPOC Portfolio, the Company will pay Third Point LLC, from the assets of each sub-account, an annual incentive fee equal to 15% of outperformance over a specified benchmark. The Company will also pay Third Point LLC a monthly management fee equal to one twelfth of 0.50% (0.50% per annum) of the TPOC Portfolio, net of any expenses, and a fixed advisory fee for the advisory services equal to 1/4 of $1,500,000 per quarter. Under the 2022 IMA, the Company may withdraw any amount from the TPOC Portfolio as of any month-end up to (i) the full balance of any sub-account established in respect of any capital contribution not in respect of TPE Withdrawn Amounts and (ii) any net profits in respect of any other sub-account. The Company may withdraw the TPOC Portfolio in full on March 31, 2026, and each successive anniversary of such date. The Company will have the right to withdraw funds monthly from the TPOC Portfolio upon the occurrence of certain events specified in the 2022 IMA, including, within 120 days following the occurrence of a Cause Event (as defined in the 2022 LPA), to meet capital adequacy requirements, to prevent a negative credit rating, for risk management purposes, underperformance of the TPOC Portfolio relative to investment funds managed by third-party managers and pursuing the same or substantially similar investment strategy as the TPOC Portfolio (i.e., which measure performance relative to the benchmark) for two or more consecutive calendar years or a Key Person Event (as defined in the 2022 LPA), subject to certain limitations on such withdrawals as specified in the 2022 IMA. The Company is also entitled to withdraw funds from the TPOC Portfolio in order to satisfy its risk management guidelines, upon prior written notice to Third Point LLC, in an amount not to exceed the Risk Management Withdrawable Amount (as defined in the 2022 LPA). As of December 31, 2022, the Company h ad no unfunded commitments related to TP Enhanced Fund . Investment in Third Point Venture Offshore Fund I LP On March 1, 2021, SiriusPoint Bermuda entered into the Amended and Restated Exempted Limited Partnership Agreement (“2021 Venture LPA”) of TP Venture Fund”) which became effective on March 1, 2021. In accordance with the 2021 Venture LPA, Third Point Venture GP LLC (“TP Venture GP”) serves as the general partner of TP Venture Fund. The TP Venture Fund investment strategy, as implemented by Third Point LLC, is to generate attractive risk-adjusted returns through a concentrated portfolio of investments in privately-held companies, primarily in the expansion through late/pre-IPO stage. The TP Venture Fund may also invest in early stage companies. Due the nature of the fund, withdrawals are not permitted. Distributions prior to the expected termination date of the fund include, but are not limited to, dividends or proceeds arising from the liquidation of the fund's underlying investments. As of December 31, 2022, the Company had $9.5 million of unfunded commitments related to TP Venture Fund. As of December 31, 2022, the Company holds interests of approximately 16.8% of the net asset value of TP Venture Fund. Investment in Third Point Venture Offshore Fund II LP On June 30, 2022, SiriusPoint Bermuda entered into the Amended and Restated Exempted Limited Partnership Agreement (“ 2022 Venture II LPA ”) of TP Venture Fund II ”). In accordance with the 2022 Venture II LPA , Third Point Venture GP II LLC (“ TP Venture GP II ”) serves as the general partner of TP Venture Fund II . The TP Venture Fund II investment strategy, as implemented by Third Point LLC, is to generate attractive risk-adjusted returns through a concentrated portfolio of investments in privately-held companies, primarily in the expansion through late/pre-IPO stage. The TP Venture Fund may also invest in early stage companies. Due the nature of the fund, withdrawals are not permitted. Distributions prior to the expected termination date of the fund include, but are not limited to, dividends or proceeds arising from the liquidation of the fund's underlying investments. As of December 31, 2022, the Company had $22.5 million of unfunded commitments related to TP Venture Fund II . As of December 31, 2022, the Company holds interests of approximately 17.8% of the net asset value of TP Venture Fund II . 9. Investments in unconsolidated entities The Company’s investments in unconsolidated entities are included within other long-term investments and consist of investments in common equity securities or similar instruments, which give the Company the ability to exert significant influence over the investee's operating and financial policies. Such investments may be accounted for under either the equity method ("equity method eligible entities") or, alternatively, the Company may elect to account for them under the fair value option (“equity method eligible unconsolidated entities”). The following table presents the components of other long-term investments as of December 31, 2022 and 2021: December 31, December 31, 2021 Equity method eligible unconsolidated entities, using the fair value option (1) $ 147.9 $ 168.1 Equity method investments 41.8 83.2 Other unconsolidated investments, at fair value (2) 124.5 198.8 Other unconsolidated investments, at cost (3) 63.0 6.0 Total other long-term investments $ 377.2 $ 456.1 (1) Excludes the Company’s investments in Related Party Investment Funds, which are equity method eligible but are carried outside of other long-term investments. See Notes 7 and 11 for additional information on these related party investment funds. (2) Includes other long-term investments that are not equity method eligible and are measured at fair value. (3) The Company has elected to apply the cost adjusted for market observable events less impairment measurement alternative to investments that do not meet the criteria to be accounted for under the equity method, in which the investment is measured at cost and remeasured to fair value when impaired or upon observable transaction prices.

Total realized and unrealized i

Total realized and unrealized investment gains (losses) and net investment income	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Total realized and unrealized investment gains (losses) and net investment income	8. Total realized and unrealized investment gains (losses) and net investment income Total realized and unrealized investment gains (losses) and net investment income for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Debt securities, available for sale $ 35.1 $ — $ — Debt securities, trading (115.6) (4.9) 72.7 Short-term investments 17.7 1.6 — Other long-term investments (10.6) 35.2 — Equity securities (0.4) (2.5) — Net realized and unrealized investment gains (losses) from related party investment funds (210.5) 304.0 195.0 Realized and unrealized investment gains and net investment income before other investment expenses and investment income (loss) on cash and cash equivalents (284.3) 333.4 267.7 Investment expenses (20.3) (11.6) (1.1) Net investment loss on cash and cash equivalents (18.1) (9.3) 12.3 Total realized and unrealized investment gains (losses) and net investment income (loss) $ (322.7) $ 312.5 $ 278.9 Net realized and unrealized gains (losses) on investments Net realized and unrealized investment gains (losses) for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Gross realized gains $ 56.2 $ 40.4 $ 64.3 Gross realized losses (132.3) (9.6) (15.9) Net realized gains (losses) on investments (76.1) 30.8 48.4 Net unrealized gains (losses) on investments (149.4) (47.7) 20.8 Net realized and unrealized gains (losses) on investments (1) (2) $ (225.5) $ (16.9) $ 69.2 (1) Excludes realized and unrealized gains (losses) on the Company’s investments in related party investment funds and unrealized gains (losses) from available for sale investments, net of tax. (2) Includes net realized and unrealized gains (losses) of $5.6 million from related party investments included in other long-term investments for the year ended December 31, 2022 (2021 - $12.9 million and 2020 - none). Net realized investment gains (losses) Net realized investment gains (losses) for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Debt securities, available for sale $ 2.7 $ — $ — Debt securities, trading (66.7) 12.3 46.4 Short-term investments (2.9) (0.1) — Equity securities (2.3) (0.1) — Other long-term investments 2.9 14.1 — Net investment income (loss) on cash and cash equivalents (9.8) 4.6 2.0 Net realized investment gains (losses) (1) $ (76.1) $ 30.8 $ 48.4 (1) Includes realized gains (losses) due to foreign currency of $(25.2) million for the year ended December 31, 2022 (2021 - $4.5 million and 2020 - $1.6 million). Net unrealized investment gains (losses) Net unrealized investment gains (losses) for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Debt securities, trading (1) $ (105.0) $ (40.2) $ 14.9 Short-term investments (0.3) 1.4 — Equity securities 1.8 (2.5) — Other long-term investments (25.7) 11.2 — Net investment income (loss) on cash and cash equivalents (20.2) (17.6) 5.9 Net unrealized investment gains (losses) (2) $ (149.4) $ (47.7) $ 20.8 (1) Includes unrealized losses, excluding foreign currency, of $15.0 million for the year ended December 31, 2022 (2021 - $23.9 million and 2020 - none). (2) Includes unrealized gains (losses) due to foreign currency of $17.9 million for the year ended December 31, 2022 (2021 - $(32.8) million and 2020 - $6.0 million). The following table summarizes the amount of total (losses) included in earnings attributable to unrealized investment (losses) – Level 3 investments for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Debt securities, trading $ 0.7 $ — $ — Other long-term investments (15.4) (5.7) — Total unrealized investment (losses) – Level 3 investments $ (14.7) $ (5.7) $ —

Investments in unconsolidated e

Investments in unconsolidated entities	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Investments in unconsolidated entities	7. Investments The Company’s invested assets consist of investment securities and other long-term investments held for general investment purposes. The portfolio of investment securities includes debt securities held for trading, debt securities available for sale, short-term investments, equity securities, and other long-term investments which are classified as trading securities with the exception of debt securities held as available for sale. Realized investment gains and losses on debt securities are reported in pre-tax revenues. Unrealized investment gains and losses on debt securities are reported based on classification. Trading securities flow through pre-tax revenues whereas securities classified as available for sale flow through other comprehensive income (loss). For debt securities classified as available for sale for which a decline in the fair value between the amortized cost is due to credit-related factors, an allowance is established for the difference between the estimated recoverable value and amortized cost with a corresponding impact to the consolidated statements of income (loss). The allowance is limited to the difference between amortized cost and fair value. A credit losses impairment assessment is performed on securities with both quantitative and qualitative factors. Qualitative factors include significant declines in fair value below amortized cost. Additionally, a qualitative assessment is also performed over debt securities to evaluate potential credit losses. Examples of qualitative indicators include issuer credit downgrades as well as changes to credit spreads. Declines in fair value related to a debt security that do not relate to a credit loss are recorded as a component of accumulated other comprehensive income (loss). Debt securities The following tables provide the cost or amortized cost, gross unrealized investment gains (losses), net foreign currency gains (losses), and fair value of the Company's debt securities as of December 31, 2022 and 2021: December 31, 2022 Cost or Gross Gross unrealized losses (3) Net foreign Fair value Debt securities, available for sale Asset-backed securities $ 234.1 $ 0.9 $ (4.3) $ — $ 230.7 Residential mortgage-backed securities 354.3 0.3 (13.9) — 340.7 Commercial mortgage-backed securities 62.1 — (0.9) — 61.2 Corporate debt securities 428.5 0.5 (13.1) (0.2) 415.7 U.S. government and government agency (1) 1,561.9 3.2 (14.5) — 1,550.6 Non-U.S. government and government agency 37.2 — (0.7) 0.1 36.6 Total debt securities, available for sale (2)(3) $ 2,678.1 $ 4.9 $ (47.4) $ (0.1) $ 2,635.5 Debt securities, trading Asset-backed securities $ 575.5 $ 0.1 $ (21.9) $ — $ 553.7 Residential mortgage-backed securities 155.9 — (22.3) — 133.6 Commercial mortgage-backed securities 130.5 — (17.1) — 113.4 Corporate debt securities 391.4 — (27.2) (0.7) 363.5 U.S. government and government agency (1) 278.6 — (8.2) — 270.4 Non-U.S. government and government agency 95.8 — (4.0) (3.6) 88.2 Preferred stocks 2.4 0.8 — — 3.2 Total debt securities, trading $ 1,630.1 $ 0.9 $ (100.7) $ (4.3) $ 1,526.0 December 31, 2021 Cost or Gross Gross Net foreign Fair value Asset-backed securities $ 512.6 $ 0.9 $ (0.4) $ — $ 513.1 Residential mortgage-backed securities 306.5 — (4.6) — 301.9 Commercial mortgage-backed securities 148.4 0.6 (1.7) — 147.3 Corporate debt securities 605.5 0.6 (3.5) — 602.6 U.S. government and government agency (1) 388.1 0.1 (2.8) — 385.4 Non-U.S. government and government agency 135.4 0.3 (2.6) (0.8) 132.3 U.S. states, municipalities and political subdivision 0.2 — — — 0.2 Preferred stocks 2.6 0.2 — — 2.8 Total debt securities (2)(3) $ 2,099.3 $ 2.7 $ (15.6) $ (0.8) $ 2,085.6 (1) The Company had $27.0 million short positions in long duration U.S. Treasuries as of December 31, 2022 (As of December 31, 2021, there were no short positions in long duration U.S. Treasuries). These amounts are included in securities sold, not yet purchased in the consolidated balance sheets. (2) As of December 31, 2022, all debt securities classified as available for sale that are in a gross unrealized loss position have been in a gross unrealized loss position for less than 12 months. As of December 31, 2021, there were no debt securities classified as available for sale. (3) As of December 31, 2022, the Company did not record an allowance for credit losses on the AFS portfolio. As of December 31, 2021, there were no debt securities classified as available for sale. The weighted average duration of the Company's debt securities, net of short positions in U.S. treasuries, as of December 31, 2022 was approximately 1.8 years, including short-term investments (2021 - 1.6 years). The following table provides the cost or amortized cost and fair value of the Company's debt securities bifurcated into debt securities held for trading (“trading”) and AFS as of December 31, 2022 and 2021 by contractual maturity. Actual maturities could differ from contractual maturities because borrowers may have the right to call or prepay certain obligations with or without call or prepayment penalties. December 31, 2022 December 31, 2021 Debt securities, trading Debt securities, AFS Debt securities, trading Cost or Fair value Cost or Fair value Cost or Fair value Due in one year or less $ 240.4 $ 230.9 $ 104.2 $ 104.0 $ 145.6 $ 145.1 Due after one year through five years 426.5 407.0 1,822.7 1,802.0 870.4 862.4 Due after five years through ten years 63.4 55.7 95.8 92.3 69.6 68.6 Due after ten years 35.5 28.5 4.9 4.6 43.6 44.4 Mortgage-backed and asset-backed securities 861.9 800.7 650.5 632.6 967.5 962.3 Preferred stocks 2.4 3.2 — — 2.6 2.8 Total debt securities $ 1,630.1 $ 1,526.0 $ 2,678.1 $ 2,635.5 $ 2,099.3 $ 2,085.6 (1) As of December 31, 2021, there were no debt securities classified as available for sale. The following table summarizes the ratings and fair value of debt securities held in the Company's investment portfolio as of December 31, 2022 and 2021: 2022 2021 Debt securities, trading Debt securities, AFS Debt securities, trading AAA $ 564.4 $ 172.8 $ 696.4 AA 523.2 1,907.6 884.1 A 181.1 188.9 278.5 BBB 158.1 149.9 153.1 Other 99.2 216.3 73.5 Total debt securities (1)(2) $ 1,526.0 $ 2,635.5 $ 2,085.6 (1) Credit ratings are assigned based on the following hierarchy: 1) Standard & Poor's ("S&P") and 2) Moody's Investors Service. (2) As of December 31, 2021, there were no debt securities classified as available for sale. As of December 31, 2022 , the above totals includ ed $95.3 million of sub-prime securities. Of this total, $56.1 million were rated AAA, $20.0 million rated AA and $19.2 million were unrated. As of December 31, 2021, the above totals included $51.8 million of sub-prime securities. Of this total, $35.1 million were rated AAA, $16.1 million rated AA and $0.6 million rated A. Equity securities and other long-term investments The cost or amortized cost, gross unrealized investment gains and losses, net foreign currency gains, and fair values of the Company’s equity securities and other long-term investments as of December 31, 2022 and 2021 were as follows: Cost or Gross Gross Net foreign Fair value December 31, 2022 Equity securities $ 1.8 $ — $ (0.2) $ — $ 1.6 Other long-term investments $ 392.0 $ 27.5 $ (41.8) $ (0.5) $ 377.2 December 31, 2021 Equity securities $ 4.5 $ 0.1 $ (2.0) $ 0.2 $ 2.8 Other long-term investments $ 443.0 $ 28.9 $ (16.8) $ 1.0 $ 456.1 The carrying value of other long-term investments as of December 31, 2022 and 2021 were as follows: December 31, December 31, 2021 Hedge funds and private equity funds (1) $ 84.9 $ 195.7 Strategic Investments (2) 262.0 215.3 Other investments (2) 30.3 45.1 Total other long-term investments $ 377.2 $ 456.1 (1) Includes $45.1 million of investments carried at NAV (December 31, 2021 - $115.2 million) and $25.1 million of investments classified as Level 3 (December 31, 2021 - $80.5 million) within the fair value hierarchy. (2) As of December 31, 2022, the Company had $16.0 million of unfunded commitments relating to these investments (December 31, 2021 - $13.8 million). Hedge funds and private equity funds The Company holds investments in hedge funds and private equity funds, which are included in other long-term investments. The following table summarizes investments in hedge funds and private equity interests by investment objective and sector as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Fair value Unfunded Fair value Unfunded Hedge funds Long/short multi-sector $ 8.8 $ — $ 19.8 $ — Distressed mortgage credit — — 24.6 — Private credit 20.7 — 24.2 — Other 0.2 — 1.7 — Total hedge funds 29.7 — 70.3 — Private equity funds Energy infrastructure & services 10.2 5.0 48.4 19.0 Multi-sector 6.6 5.1 10.1 5.1 Healthcare 19.9 0.3 31.0 2.2 Life settlement 13.6 — 12.9 — Manufacturing/Industrial — — 19.9 — Private equity secondaries 0.4 0.1 0.5 0.4 Other 4.5 21.0 2.6 — Total private equity funds 55.2 31.5 125.4 26.7 Total hedge and private equity funds included in other long-term investments $ 84.9 $ 31.5 $ 195.7 $ 26.7 (1) The table excludes the Company’s investments in TP Enhanced Fund, TP Venture Fund and TP Venture Fund II. See “Investment in related party investment funds” below for additional information. Redemption of investments in certain hedge funds is subject to restrictions including lock-up periods where no redemptions or withdrawals are allowed, restrictions on redemption frequency, and advance notice periods for redemptions. Amounts requested for redemptions remain subject to market fluctuations until the redemption effective date, which generally falls at the end of the defined redemption period. The following summarizes the December 31, 2022 fair value of hedge funds subject to restrictions on redemption frequency and advance notice period requirements for investments in active hedge funds: Notice Period Redemption Frequency 1-29 days 30-59 days 60-89 days 90-119 days 120+ days Total Quarterly $ — $ 0.1 $ 8.7 $ 0.1 $ — $ 8.9 Semi-annual — — 0.1 — — 0.1 Annual — — — 0.1 20.6 20.7 Total $ — $ 0.1 $ 8.8 $ 0.2 $ 20.6 $ 29.7 Certain of the hedge fund and private equity fund investments in which the Company is invested are no longer active and are in the process of disposing of their underlying investments. Distributions from such funds are remitted to investors as the fund's underlying investments are liquidated. As of December 31, 2022 , $6.3 million in distributions were outstanding from these investments. Investments in private equity and other investment funds may be subject to a “lock-up" or commitment period during which investors may not request a redemption prior to the expected termination date. Distributions prior to the expected termination date of the fund may be limited to dividends or proceeds arising from the liquidation of the fund's underlying investments. In addition, certain private equity funds provide an option to extend the lock-up or commitment periods at either the sole discretion of the fund manager or upon agreement between the fund and the investors. As of December 31, 2022, investments in private equity funds were subject to lock-up periods as follows: 1 - 3 years 3 – 5 years 5 – 10 years Total Private equity funds – expected lock-up or commitment period remaining $ 19.5 $ 19.9 $ 15.8 $ 55.2 Investment in related party investment funds The following table provides the fair value of the Company's investments in related party investment funds as of December 31, 2022 and 2021: December 31, December 31, 2021 Third Point Enhanced LP $ 100.3 $ 878.2 Third Point Venture Offshore Fund I LP 26.0 31.4 Third Point Venture Offshore Fund II LP 2.5 — Investments in related party investment funds, at fair value $ 128.8 $ 909.6 Investment in Third Point Enhanced LP On February 23, 2022, the Company entered into the Fourth Amended and Restated Exempted Limited Partnership Agreement of Third Point Enhanced LP (“ TP Enhanced Fund ”) with Third Point Advisors LLC (“TP GP”) and the other parties thereto (the “2022 LPA”), which amended and restated the Third Amended and Restated Exempted Limited Partnership Agreement dated August 6, 2020 (the “2020 LPA”). The TP Enhanced Fund investment strategy, as implemented by Third Point LLC, is intended to achieve superior risk-adjusted returns by deploying capital in both long and short investments with favorable risk/reward characteristics across select asset classes, sectors and geographies. Third Point LLC identifies investment opportunities via a bottom-up, value-oriented approach to single security analysis supplemented by a top-down view of portfolio and risk management. Third Point LLC seeks dislocations in certain areas of the capital markets or in the pricing of particular securities and supplements single security analysis with an approach to portfolio construction that includes sizing each investment based on upside/downside calculations, all with a view towards appropriately positioning and managing overall exposures. The 2020 LPA was amended and restated to, among other things: • add the right to withdraw the Company’s capital accounts in TP Enhanced Fund as of any month-end in accordance with an agreed withdrawal schedule to be reinvested in, or contractually committed to, the Third Point Optimized Credit portfolio (the “TPOC Portfolio”), or other Third Point strategies (“TPE Withdrawn Amounts”); • remove restrictions on the Company’s withdrawal rights following a change of control with respect to the Company; • authorize the Company’s Chief Investment Officer to exercise all decisions under the 2022 LPA, without the need for separate approval from the Investment Committee of the Company’s Board of Directors; • provide that the Company may amend the investment guidelines of the 2022 LPA from time to time for risk management purposes in consultation with TP GP; • provide that the Company and TP GP may discuss the adoption of new risk parameters for TP Enhanced Fund from time to time, and TP GP will work with the Company to create additional risk management guidelines responsive to the Company’s needs that do not fundamentally alter the general investment strategy or investment approach of TP Enhanced Fund ; • provide that the Company may increase or decrease TP Enhanced Fund ’s leverage targets upon reasonable prior notice to meet the business needs of the Company; and • revise the “cause event” materiality qualifier with respect to violations of law related to Third Point LLC’s investment-related business and Third Point LLC being subject to regulatory proceedings to include events that will likely have a material adverse effect on Third Point LLC’s ability to provide investment management services to TP Enhanced Fund and/or the TPOC Portfolio. All other material terms of the 2022 LPA remain consistent with the 2020 LPA. Amended and Restated Investment Management Agreement On February 23, 2022, the Company entered into an Amended and Restated Investment Management Agreement (the “2022 IMA”) with Third Point LLC and the other parties thereto, which amended and restated the Investment Management Agreement dated August 6, 2020. Pursuant to the 2022 IMA, Third Point LLC provides discretionary investment management services with respect to a newly established TPOC Portfolio, subject to investment and risk management guidelines, and continues to provide certain non-discretionary investment advisory services to the Company. The Company agreed to contribute to the TPOC Portfolio amounts withdrawn from TP Enhanced Fund on January 31, 2022 that were not invested or committed for investment in other Third Point strategies. The 2022 IMA contains revised term and termination rights, withdrawal rights, incentive fees, management fees, investment guidelines and advisory fees. For the investment management services provided in respect of the TPOC Portfolio, the Company will pay Third Point LLC, from the assets of each sub-account, an annual incentive fee equal to 15% of outperformance over a specified benchmark. The Company will also pay Third Point LLC a monthly management fee equal to one twelfth of 0.50% (0.50% per annum) of the TPOC Portfolio, net of any expenses, and a fixed advisory fee for the advisory services equal to 1/4 of $1,500,000 per quarter. Under the 2022 IMA, the Company may withdraw any amount from the TPOC Portfolio as of any month-end up to (i) the full balance of any sub-account established in respect of any capital contribution not in respect of TPE Withdrawn Amounts and (ii) any net profits in respect of any other sub-account. The Company may withdraw the TPOC Portfolio in full on March 31, 2026, and each successive anniversary of such date. The Company will have the right to withdraw funds monthly from the TPOC Portfolio upon the occurrence of certain events specified in the 2022 IMA, including, within 120 days following the occurrence of a Cause Event (as defined in the 2022 LPA), to meet capital adequacy requirements, to prevent a negative credit rating, for risk management purposes, underperformance of the TPOC Portfolio relative to investment funds managed by third-party managers and pursuing the same or substantially similar investment strategy as the TPOC Portfolio (i.e., which measure performance relative to the benchmark) for two or more consecutive calendar years or a Key Person Event (as defined in the 2022 LPA), subject to certain limitations on such withdrawals as specified in the 2022 IMA. The Company is also entitled to withdraw funds from the TPOC Portfolio in order to satisfy its risk management guidelines, upon prior written notice to Third Point LLC, in an amount not to exceed the Risk Management Withdrawable Amount (as defined in the 2022 LPA). As of December 31, 2022, the Company h ad no unfunded commitments related to TP Enhanced Fund . Investment in Third Point Venture Offshore Fund I LP On March 1, 2021, SiriusPoint Bermuda entered into the Amended and Restated Exempted Limited Partnership Agreement (“2021 Venture LPA”) of TP Venture Fund”) which became effective on March 1, 2021. In accordance with the 2021 Venture LPA, Third Point Venture GP LLC (“TP Venture GP”) serves as the general partner of TP Venture Fund. The TP Venture Fund investment strategy, as implemented by Third Point LLC, is to generate attractive risk-adjusted returns through a concentrated portfolio of investments in privately-held companies, primarily in the expansion through late/pre-IPO stage. The TP Venture Fund may also invest in early stage companies. Due the nature of the fund, withdrawals are not permitted. Distributions prior to the expected termination date of the fund include, but are not limited to, dividends or proceeds arising from the liquidation of the fund's underlying investments. As of December 31, 2022, the Company had $9.5 million of unfunded commitments related to TP Venture Fund. As of December 31, 2022, the Company holds interests of approximately 16.8% of the net asset value of TP Venture Fund. Investment in Third Point Venture Offshore Fund II LP On June 30, 2022, SiriusPoint Bermuda entered into the Amended and Restated Exempted Limited Partnership Agreement (“ 2022 Venture II LPA ”) of TP Venture Fund II ”). In accordance with the 2022 Venture II LPA , Third Point Venture GP II LLC (“ TP Venture GP II ”) serves as the general partner of TP Venture Fund II . The TP Venture Fund II investment strategy, as implemented by Third Point LLC, is to generate attractive risk-adjusted returns through a concentrated portfolio of investments in privately-held companies, primarily in the expansion through late/pre-IPO stage. The TP Venture Fund may also invest in early stage companies. Due the nature of the fund, withdrawals are not permitted. Distributions prior to the expected termination date of the fund include, but are not limited to, dividends or proceeds arising from the liquidation of the fund's underlying investments. As of December 31, 2022, the Company had $22.5 million of unfunded commitments related to TP Venture Fund II . As of December 31, 2022, the Company holds interests of approximately 17.8% of the net asset value of TP Venture Fund II . 9. Investments in unconsolidated entities The Company’s investments in unconsolidated entities are included within other long-term investments and consist of investments in common equity securities or similar instruments, which give the Company the ability to exert significant influence over the investee's operating and financial policies. Such investments may be accounted for under either the equity method ("equity method eligible entities") or, alternatively, the Company may elect to account for them under the fair value option (“equity method eligible unconsolidated entities”). The following table presents the components of other long-term investments as of December 31, 2022 and 2021: December 31, December 31, 2021 Equity method eligible unconsolidated entities, using the fair value option (1) $ 147.9 $ 168.1 Equity method investments 41.8 83.2 Other unconsolidated investments, at fair value (2) 124.5 198.8 Other unconsolidated investments, at cost (3) 63.0 6.0 Total other long-term investments $ 377.2 $ 456.1 (1) Excludes the Company’s investments in Related Party Investment Funds, which are equity method eligible but are carried outside of other long-term investments. See Notes 7 and 11 for additional information on these related party investment funds. (2) Includes other long-term investments that are not equity method eligible and are measured at fair value. (3) The Company has elected to apply the cost adjusted for market observable events less impairment measurement alternative to investments that do not meet the criteria to be accounted for under the equity method, in which the investment is measured at cost and remeasured to fair value when impaired or upon observable transaction prices.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	10. Derivatives The Company holds derivative financial instruments for both risk management and investment purposes. Foreign currency risk derivatives The Company executes foreign currency forwards, call options, swaps, and futures to manage foreign currency exposure. The foreign currency risk derivatives are not designated or accounted for under hedge accounting. Changes in fair value are presented within foreign exchange (gains) losses. The fair value of the swaps and forwards are estimated using a single broker quote, and accordingly, are classified as a Level 3 measurement. The fair value of the futures is widely available and have quoted prices in active markets, and accordingly, were classified as a Level 1 measurement. The Company holds $15.2 million in collateral associated with the foreign currency derivatives. Weather Derivatives The Company holds assets and assumes liabilities related to weather and weather contingent risk management products. Weather and weather contingent derivative contracts are entered into with the objective of generating profits in normal climatic conditions. Accordingly, the Company’s weather and weather contingent derivatives are not designed to meet the criteria for hedge accounting under GAAP. The Company receives payment of premium at the contract inception in exchange for bearing the risk of variations in a quantifiable weather index. Changes in fair value are presented within net corporate and other expenses. Management uses available market data and intern al pricing models based upon consistent statistical methodologies to estimate the fair value. Because of the significance of the unobservable inputs used to estimate the fair value of the Company's weather risk contracts, the fair value measurements of the contracts are deemed to be Level 3 measurements in the fair value hierarchy as of December 31, 2022. The Company does not provide or hold any collateral associated with the weather derivatives. Interest rate cap The Company entered into an interest rate swap ("Interest rate cap") that matured on June 30, 2022 with two financial institutions where it paid an upfront premium and in return receives a series of quarterly payments based on the 3-month London Interbank Offered Rate (“LIBOR”) at the time of payment. Changes in fair value are recognized as unrealized gains or losses and are presented within net investment income. The following table summarizes information on the classification and amount of the fair value of derivatives not designated as hedging instruments within the Company's consolidated balance sheets as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Derivatives not designated as hedging instruments Derivative assets at fair value (1) Derivative liabilities at fair value (2) Notional Derivative assets at fair value (1) Derivative liabilities at fair value (2) Notional Foreign currency forwards $ 9.0 $ — $ 425.1 $ — $ 1.3 $ 83.6 Foreign currency swaps — 1.5 264.6 — 1.7 40.0 Weather derivatives — 4.9 30.6 — 0.8 6.2 Foreign currency futures contracts — — — 0.2 — 133.9 Equity warrants — — — 0.1 — 0.1 Interest rate cap $ — $ — $ — $ — $ — $ 250.0 (1) Derivative assets are classified within other assets (2) Derivative liabilities are classified within accounts payable, accrued expenses and other liabilities The following table summarizes information on the classification and net impact on earnings, recognized in the Company's consolidated statements of income (loss) relating to derivatives during the years ended December 31, 2022, 2021 and 2020: Derivatives not designated as hedging instruments Classification of gains (losses) recognized in earnings 2022 2021 2020 Foreign currency futures contracts Foreign exchange (gains) losses $ (32.1) $ (8.0) $ — Foreign currency forwards Foreign exchange (gains) losses (8.1) (1.3) — Weather derivatives Other revenues 7.3 0.9 — Foreign currency swaps Foreign exchange (gains) losses 1.5 0.2 — Equity warrants Net realized and unrealized investment gains (losses) (0.1) (0.3) — Foreign currency call options Foreign exchange (gains) losses $ — $ 0.4 $ — Underwriting-related derivatives The following tables identify the listing currency, fair value and notional amounts of underwriting-related derivatives included in the consolidated balance sheets as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Derivative assets Listing currency Fair Value Notional Amounts (1) Fair Value Notional Amounts (1) Reinsurance contracts accounted for as derivative assets British Pound $ 0.5 $ 16.5 $ 1.2 $ 49.3 Reinsurance contracts accounted for as derivative liabilities British Pound $ 2.2 $ 76.4 $ 0.1 $ 37.4 (1) The absolute notional exposure represents the Company’s derivative activity as of December 31, 2022 and 2021, which is representative of the volume of derivatives held during the period.

Variable and voting interest en

Variable and voting interest entities	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable and voting interest entities	11. Variable and voting interest entities The Company consolidates the results of operations and financial position of every voting interest entity ("VOE") in which it has a controlling financial interest and variable interest entities (“VIE”) in which it is considered to be the primary beneficiary in accordance with guidance in ASC 810, Consolidation . The consolidation assessment, including the determination as to whether an entity qualifies as a VOE or VIE, depends on the facts and circumstances surrounding each entity. Consolidated variable interest entities Alstead Re Alstead Re Insurance Company (“Alstead Re”) is considered a VIE and the C ompany has concluded that it is the primary beneficiary of Alstead Re because the Company can exercise control over the activities that most significantly impact the economic performance of Alstead Re. As a result, the Company has consolidated the results of Alstead Re in its consolidated financial statements. As of December 31, 2022, Alstead Re’s assets and liabilities included in the Company’s consolidated balance sheets were $14.0 million and $9.0 million, respectively (December 31, 2021 - $9.8 million and $5.5 million, respectively). Arcadian Arcadian Risk Capital Ltd. (“Arcadian”) is considered a VIE and the Company has concluded that it is the primary beneficiary of Arcadian because the Company can exercise control over the activities that most significantly impact the economic performance of Arcadian. As a result, the Company has consolidated the results of Arcadian in its consolidated financial statements. The Company’s ownership in Arcadian as of December 31, 2022 was 49%, and its financial exposure to Arcadian is limited to its investment in Arcadian’s common shares and other financial support up to $18.0 million through an unsecured promissory note. As of December 31, 2022 , Arcadian’s assets and liabilities, after intercompany eliminations, included in the Company’s consolidated balance sheets were $32.3 million and $9.7 million , respectively ( December 31, 2021 - $29.0 million and $7.0 million , respectively). Joyn Joyn Insurance Services Inc. (“Joyn”) was considered a VIE through the third quarter of 2022 and the Company concluded that it was the primary beneficiary of Joyn because the Company could have exercised control over the activities that most significantly impact the economic performance of Joyn. As a result, the Company had consolidated the results of Joyn in its consolidated financial statements. During the quarter ended December 31, 2022, an additional investment was made in Joyn by third parties, after which Joyn no longer met the criterion for consolidation. During the year ended December 31, 2022, the Company recognized a pre-tax loss of $8.7 million related to Joyn, recorded in other revenues in the Company’s consolidated statements of income (loss). As of December 31, 2022, the investment in Joyn is recorded in other long-term investments in the Company’s consolidated balance sheets utilizing cost adjusted for market observable events less impairment method. As of December 31, 2021, Joyn’s assets and liabilities, after intercompany eliminations, included in the Company’s consolidated balance sheets were $7.8 million and $4.1 million, respectively. Consolidated voting interest entities Alta Signa On June 30, 2022, the Company entered into a strategic partnership with Alta Signa Holdings (“Alta Signa”), a European MGA specializing in financial and professional lines insurance. The Company’s ownership in Alta Signa as of December 31, 2022 was 75.1%. Alta Signa is considered a VOE and the Company holds a majority of the voting interests through its seats on Alta Signa’s board of directors. As a result, the Company has consolidated the results of Alta Signa in its consolidated financial statements. As of December 31, 2022, Alta Signa’s assets and liabilities, after intercompany eliminations, included in the Company’s consolidated balance sheets were $8.0 million and $2.1 million, respectively. Noncontrolling interests Noncontrolling interests represent the portion of equity in consolidated subsidiaries not attributable, directly or indirectly, to the Company. The following table is a reconciliation of the beginning and ending carrying amount of noncontrolling interests for the years ended December 31, 2022 and 2021: 2022 2021 Balance, beginning of period $ (0.4) $ 1.4 Sirius Group acquisition and other business combinations (1) 0.8 0.3 Net income (loss) attributable to noncontrolling interests 0.8 (2.3) Contributions (Redemptions) — 0.2 Derecognition of noncontrolling interest (2) 6.7 — Balance, end of period $ 7.9 $ (0.4) (1) See Note 3 for additional information related to the acquisition of Sirius Group. (2) See above for additional information on the derecognition of noncontrolling interest in Joyn. Non-consolidated variable interest entities The Company is a passive investor in certain third-party-managed hedge and private equity funds, some of which are VIEs. The Company is not involved in the design or establishment of these VIEs, nor does it actively participate in the management of the VIEs. The exposure to loss from these investments is limited to the carrying value of the investments at the balance sheet date. The Company calculates maximum exposure to loss to be (i) the amount invested in the debt or equity of the VIE, (ii) the notional amount of VIE assets or liabilities where the Company has also provided credit protection to the VIE with the VIE as the referenced obligation, and (iii) other commitments and guarantees to the VIE. The Company does not have any VIEs that it sponsors nor any VIEs where it has recourse to it or has provided a guarantee to the VIE interest holders. The following table presents total assets of unconsolidated VIEs in which the Company holds a variable interest, as well as the maximum exposure to loss associated with these VIEs as of December 31, 2022 and December 31, 2021: Maximum Exposure to Loss Total VIE Assets On-Balance Sheet Off-Balance Sheet Total December 31, 2022 Other long-term investments (1) $ 211.5 $ 144.0 $ 2.0 $ 146.0 December 31, 2021 Other long-term investments (1) $ 326.2 $ 177.5 $ 2.1 $ 179.6 (1) Excludes the Company’s investments in Related Party Investment Funds which are also VIEs and are discussed separately below. Third Point Enhanced LP As of December 31, 2022, the Company and TP GP hold interests of approximately 89.4% and 10.6%, respectively, of the net asset value of TP Enhanced Fund. As a result, both entities hold significant financial interests in TP Enhanced Fund. However, TP GP controls all of the investment decision-making authority and the Company does not have the power to direct the activities which most significantly impact the economic performance of TP Enhanced Fund. As a result, the Company is not considered the primary beneficiary and does not consolidate TP Enhanced Fund. The Company’s maximum exposure to loss corresponds to the value of its investments in TP Enhanced Fund. Investment in Third Point Venture Offshore Fund I LP TP Venture GP controls all of the investment decision-making authority of the TP Venture Fund. The Company does not have the power to direct the activities which most significantly impact the economic performance of the TP Venture Fund. The Company’s maximum exposure to loss corresponds to the value of its investment in TP Venture Fund . See Note 7 for additional information on the Company’s investment in TP Venture Fund. Investment in Third Point Venture Offshore Fund II LP TP Venture GP II controls all of the investment decision-making authority of the TP Venture Fund II. The Company does not have the power to direct the activities which most significantly impact the economic performance of the TP Venture Fund II. The Company’s maximum exposure to loss corresponds to the value of its investment in TP Venture Fund II. See Note 7 for additional information on the Company’s investment in TP Venture Fund II .

Loss and loss adjustment expens

Loss and loss adjustment expense reserves	12 Months Ended
	Dec. 31, 2022
Insurance [Abstract]
Loss and loss adjustment expense reserves	12. Loss and loss adjustment expense reserves As of December 31, 2022 and 2021, loss and loss adjustment expense reserves in the consolidated balance sheets was comprised of the following: December 31, December 31, 2021 Case loss and loss adjustment expense reserves $ 1,980.2 $ 1,916.8 Incurred but not reported loss and loss adjustment expense reserves 3,226.5 2,868.2 Unallocated loss adjustment expense reserves 62.0 55.8 Deferred gains on retroactive reinsurance contracts — 0.6 $ 5,268.7 $ 4,841.4 Reserving methodologies The Company establishes loss and loss adjustment expense reserves that are estimates of future amounts needed to pay claims and related expenses for events that have already occurred. The Company also obtains reinsurance whereby another reinsurer contractually agrees to indemnify the Company for all or a portion of the insurance or reinsurance risks underwritten by the Company. The Company establishes estimates of amounts recoverable from the reinsurer in a manner consistent with the loss and loss adjustment expense liability associated with the original policies issued, net of an allowance for uncollectible amounts. Net reinsurance loss reserves represent loss and loss adjustment expense reserves reduced by reinsurance recoverable on unpaid losses. The process of estimating reserves involves a considerable degree of judgment by management and, as of any given date, is inherently uncertain. Based on the above, such uncertainty may be larger relative to the reserves for reinsurance compared to insurance, and certainty may take a longer time to emerge. Upon notification of a loss from an insured (either a ceding company or a primary insured), the Company establishes case reserves, including loss adjustment expense reserves, based upon the Company’s share of the amount of reserves reported by the insured and the Company's independent evaluation of the loss. Generally, initial actuarial estimates of IBNR reserves not related to a specific event are based on the expected loss ratio method applied to each class of business. The Company regularly reviews the adequacy of its recorded reserves by using a variety of generally accepted actuarial methods, including incurred and paid loss development methods and Bornhuetter-Ferguson paid and incurred loss methods. Use of these methods involves key assumptions, including expected loss ratios and paid and incurred loss development factors. Key to the projection of ultimate losses are the selection and weighting of the actuarial methods. Estimates of the initial expected ultimate losses involve management judgment and are based on historical information for that class of business, which includes loss ratios, market conditions, changes in pricing and conditions, underwriting changes, changes in claims emergence and other factors that may influence expected ultimate losses. If actual loss activity differs substantially from expectations, an adjustment to recorded reserves may be warranted. The uncertainties that could lead to these substantial differences are primarily due to the lapse of time to receive the reporting of the claims and the ultimate settlement of the claims; the diversity of development patterns among different lines of business; and the reliance on cedents, managing general underwriters, and brokers for information regarding claims. As time passes, loss reserve estimates for a given year will rely more on actual loss activity and historical patterns than on initial loss ratio assumptions. Catastrophe event estimates Some of the Company’s contracts are exposed to losses from catastrophes (either natural catastrophes or man-made catastrophes). Given the high-severity, low-frequency nature of these events, the losses typically generated from catastrophe events do not lend themselves to traditional actuarial reserving methods, such as those described above. Therefore, the reserving approach for these types of coverages is to estimate the ultimate cost associated with a single loss event rather than analyzing the historical development patterns of past losses for estimating ultimate losses for an entire contract. The Company estimates reserves for these catastrophe events on a contract-by-contract basis by means of a review of policies with known or potential exposure to a particular loss event. The Company considers the following information when making these contract-by-contract estimates of catastrophe event losses: information provided by cedents and brokers; industry loss estimates; our estimated market share; catastrophe model output; and the terms and conditions of the contracts with exposure to those events. Initial estimates are established in the period that a catastrophe event occurs and are then monitored each subsequent quarter, considering the latest information available. Roll forward of loss and loss adjustment expense reserves The following table represents the activity in the loss and loss adjustment expense reserves for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Gross reserves for loss and loss adjustment expenses, beginning of year $ 4,841.4 $ 1,310.1 $ 1,111.7 Less: loss and loss adjustment expenses recoverable, beginning of year (1,215.3) (14.4) (5.5) Less: deferred charges on retroactive reinsurance contracts (1.4) (6.0) (6.7) Net reserves for loss and loss adjustment expenses, beginning of year 3,624.7 1,289.7 1,099.5 Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: Current year 1,609.7 1,369.1 431.5 Prior years (21.3) (42.6) 33.8 Total incurred loss and loss adjustment expenses 1,588.4 1,326.5 465.3 Net loss and loss adjustment expenses paid in respect of losses occurring in: Current year (316.1) (271.2) (73.6) Prior years (939.2) (1,178.9) (209.5) Total net paid losses (1,255.3) (1,450.1) (283.1) Foreign currency translation (66.3) (9.2) 8.0 Amounts acquired as a result of Sirius Group acquisition (1) — 2,467.8 — Net reserves for loss and loss adjustment expenses, end of year 3,891.5 3,624.7 1,289.7 Plus: loss and loss adjustment expenses recoverable, end of year 1,376.2 1,215.3 14.4 Plus: deferred charges on retroactive reinsurance contracts (2) 1.0 1.4 6.0 Gross reserves for loss and loss adjustment expenses, end of year $ 5,268.7 $ 4,841.4 $ 1,310.1 (1) Represents the fair value of Sirius Group’s reserves for claims and claim expenses, net of reinsurance recoverables, acquired at February 26, 2021. See Note 3 for additional information related to the acquisition of Sirius Group. (2) Deferred charges on retroactive contracts are recorded in other assets on the Company’s consolidated balance sheets. The Company's prior year reserve development arises from changes to estimates of losses and loss adjustment expenses related to loss events that occurred in previous calendar years. For the year ended December 31, 2022 , the Company recorded $21.3 million of net favorable prior year loss reserve development driven by favorable development due to reserve releases in COVID-19 and A&H reserves due to better than expected loss experience, with the most significant offsetting movements being reserve strengthening in direct Workers’ Compensation reserves based on reported loss emergence, and in the Property lines, driven by the current elevated level of inflation. For the year ended December 31, 2021 , the Company recorded $42.6 million of net favorable prior year loss reserve development driven by $18.6 million of net favorable prior year reserve development in the Reinsurance segment as a result of better than expected loss reserve emergence on historical property events relating to multiple accident years and better than expected attritional loss experience, $13.5 million of net favorable prior year reserve development in the Insurance & Services segment as a result of better than expected loss experience in A&H for recent accident years, and $10.5 million of net favorable prior year reserve development in Corporate as a result of better than expected loss experience on property and contingency classes moved to runoff in 2021. For the year ended December 31, 2020, the Company recorded $33.8 million of net adverse prior years loss reserve development, which includes $18.8 million increase in loss reserves resulting from increases in premium earnings estimates on certain contracts and $15.0 million of net adverse reserve development related to increases in loss reserve estimates . In total, the change in net underwriting loss for prior periods due to loss reserve development and adjustments to premium earnings estimates, after the impact of any offsetting changes in acquisition costs as a result of sliding scale or profit commissions, resulted in a $30.5 million increase in the net underwriting loss for the year ended December 31, 2020. The adverse underwriting loss development was a result of accumulated loss experience and cedent reserving increases, indicating that underlying casualty loss trends were higher than initial pricing and reserving. Incurred and paid development tables by accident year The Company manages its business on the basis of two operating segments, Reinsurance and Insurance & Services. The Company has disaggregated its loss information presented in the tables below by line of business in each segment. The Company has presented the below development tables for all accident years shown using exchange rates as at December 31, 2022. All accident years prior to the current year have been restated and presented using the current year exchange rate. The Company’s loss reserve analysis is based primarily on underwriting year data. The preparation of accident year development tables requires an allocation of underwriting year data to the corresponding accident years. For instance, a contract written in one particular underwriting year may have exposure to losses from two or more accident years. These allocations are done using accident year loss payment and reporting patterns, along with premium earnings patterns. These patterns are derived from either company-specific or industry historical loss data, depending on availability and applicability. The Company believes that its allocations are reasonable; however, to the extent that the Company’s allocation procedure for loss and loss adjustment expenses incurred differs from actual historical development, the actual loss development may differ materially from the loss development presented. As described in the roll forward of loss and loss adjustment expense reserves section above, changes in the Company’s loss and loss adjustment expense reserves result from both re-estimating loss reserves as well as changes in premium estimates. Reinsurance The following tables provide a breakdown of the Company’s loss and allocated loss adjustment expenses incurred, net and net loss and allocated loss adjustment expenses paid by accident year by line of business for the Company’s Reinsurance segment for the year ended December 31, 2022. The information related to loss and allocated loss adjustment expenses incurred, net and net loss and allocated loss adjustment expenses paid for the years ended December 31, 2013 through 2021 is presented as supplementary information and is unaudited: Aviation & Space Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 38.4 $ 34.3 $ 31.2 $ 29.9 $ 30.8 $ 30.9 $ 31.0 $ 30.7 $ 31.4 $ 31.6 $ — 2014 — 31.8 34.3 30.8 29.8 29.7 28.3 30.0 29.2 29.7 (2.2) 2015 — — 34.6 31.0 35.0 34.0 33.3 33.5 34.3 34.9 1.7 2016 — — — 31.7 32.0 33.0 35.3 34.9 35.2 36.3 (0.1) 2017 — — — — 33.7 42.6 43.8 45.3 45.7 48.4 0.5 2018 — — — — — 47.7 50.3 58.2 60.7 63.2 3.1 2019 — — — — — — 60.2 71.6 75.7 93.8 21.2 2020 — — — — — — — 39.8 41.5 39.9 1.5 2021 — — — — — — — — 41.9 37.5 9.8 2022 — — — — — — — — — 58.2 46.0 Total $ 473.5 $ 81.5 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 12.4 $ 18.1 $ 22.1 $ 24.7 $ 26.4 $ 27.1 $ 28.4 $ 28.5 $ 29.4 $ 29.4 2014 — 6.2 14.2 19.7 22.0 23.6 24.2 25.7 25.3 25.8 2015 — — 8.8 18.2 24.2 30.5 32.0 32.8 33.4 34.0 2016 — — — 7.5 19.2 26.3 28.7 32.0 33.2 34.3 2017 — — — — 8.9 23.5 32.2 35.5 39.1 40.6 2018 — — — — — 14.2 27.3 36.5 42.2 46.2 2019 — — — — — — 8.3 22.3 32.3 37.7 2020 — — — — — — — 10.8 22.1 29.5 2021 — — — — — — — — 6.5 15.0 2022 — — — — — — — — — 6.9 Total $ 299.4 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 174.1 Net reserves for loss and allocated loss adjustment expenses prior to 2013 2.4 Aviation & Space - net reserves for loss and allocated loss adjustment expenses, end of year $ 176.5 Casualty Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 72.1 $ 53.4 $ 57.9 $ 57.9 $ 57.9 $ 57.8 $ 57.4 $ 57.6 $ 57.0 $ 57.2 $ — 2014 — 178.1 178.3 182.4 171.5 172.6 171.8 172.3 171.8 171.3 0.8 2015 — — 223.5 256.7 237.5 237.6 237.9 240.4 240.4 239.8 5.9 2016 — — — 270.3 267.2 265.5 261.7 264.6 265.2 264.6 12.1 2017 — — — — 246.2 253.5 254.7 258.8 261.9 262.5 27.7 2018 — — — — — 317.3 340.4 346.8 349.3 351.9 63.7 2019 — — — — — — 388.8 423.9 441.4 446.0 138.3 2020 — — — — — — — 377.7 416.8 414.9 214.3 2021 — — — — — — — — 351.8 342.5 211.9 2022 — — — — — — — — — 391.4 317.5 Total $ 2,942.1 $ 992.2 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 11.3 $ 27.8 $ 40.4 $ 46.8 $ 51.4 $ 53.6 $ 55.0 $ 55.4 $ 56.0 $ 55.9 2014 — 51.1 128.3 147.6 153.5 161.1 164.3 166.2 167.2 168.2 2015 — — 75.7 151.7 184.6 201.3 210.9 218.9 223.7 226.7 2016 — — — 64.9 171.4 196.4 212.3 224.0 232.3 239.3 2017 — — — — 82.3 136.1 157.2 180.1 199.0 212.6 2018 — — — — — 57.2 111.2 151.0 211.2 237.5 2019 — — — — — — 45.5 116.2 181.2 236.9 2020 — — — — — — — 38.0 65.7 137.2 2021 — — — — — — — — 29.1 77.9 2022 — — — — — — — — — 24.6 Total $ 1,616.8 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 1,325.3 Net reserves for loss and allocated loss adjustment expenses prior to 2013 9.5 Casualty - net reserves for loss and allocated loss adjustment expenses, end of year $ 1,334.8 Contingency Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ — 2014 — — — — — — — — — — — 2015 — — — — — — — — — — — 2016 — — — — — — — — — — — 2017 — — — — 0.5 0.5 1.1 0.7 0.8 0.7 — 2018 — — — — — 1.4 1.7 1.5 1.6 1.4 — 2019 — — — — — — 1.8 1.8 1.8 1.8 — 2020 — — — — — — — 13.7 11.2 11.7 1.2 2021 — — — — — — — — 8.4 10.4 0.1 2022 — — — — — — — — — 8.7 0.6 Total $ 34.8 $ 1.9 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 2014 — — — — — — — — — — 2015 — — — — — — — — — — 2016 — — — — — — — — — — 2017 — — — — (0.1) 0.1 0.4 0.6 0.6 0.6 2018 — — — — — (0.1) 0.8 1.3 1.3 1.4 2019 — — — — — — (0.1) 1.1 1.2 1.5 2020 — — — — — — — 3.2 4.1 11.2 2021 — — — — — — — — 3.6 7.3 2022 — — — — — — — — — 4.0 Total $ 26.1 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 8.7 Net reserves for loss and allocated loss adjustment expenses prior to 2013 0.8 Contingency - net reserves for loss and allocated loss adjustment expenses, end of year $ 9.5 Credit & Bond Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 29.1 $ 28.3 $ 27.4 $ 27.0 $ 27.8 $ 27.4 $ 27.7 $ 27.8 $ 28.3 $ 28.7 $ 0.8 2014 — 25.1 24.6 25.2 23.2 22.2 22.0 21.9 22.1 22.1 (2.0) 2015 — — 23.7 23.3 22.5 20.9 20.0 19.4 19.4 19.7 0.6 2016 — — — 19.3 17.9 17.6 16.7 16.3 16.6 16.0 0.1 2017 — — — — 24.3 25.0 24.0 22.5 22.5 21.5 3.2 2018 — — — — — 30.8 31.3 30.5 30.8 29.7 1.5 2019 — — — — — — 40.2 38.4 38.0 35.1 3.0 2020 — — — — — — — 44.7 41.1 38.9 10.5 2021 — — — — — — — — 22.5 21.6 9.6 2022 — — — — — — — — — 37.5 25.8 Total $ 270.8 $ 53.1 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 11.1 $ 19.0 $ 22.0 $ 23.2 $ 23.9 $ 24.0 $ 24.2 $ 24.2 $ 24.5 $ 26.2 2014 — 7.5 13.6 17.9 19.9 20.5 20.9 20.9 21.0 21.2 2015 — — 4.6 12.6 16.8 18.1 18.2 18.1 18.0 18.3 2016 — — — 5.3 10.4 13.2 14.3 14.7 15.0 15.3 2017 — — — — 3.9 10.2 14.4 15.5 15.9 17.3 2018 — — — — — 8.2 17.6 22.9 24.2 25.4 2019 — — — — — — 9.7 20.7 26.8 28.5 2020 — — — — — — — 18.6 20.6 23.5 2021 — — — — — — — — 4.4 7.2 2022 — — — — — — — — — 7.7 Total $ 190.6 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 80.2 Net reserves for loss and allocated loss adjustment expenses prior to 2013 2.5 Credit & Bond - net reserves for loss and allocated loss adjustment expenses, end of year $ 82.7 Marine & Energy Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 19.9 $ 17.8 $ 16.6 $ 15.8 $ 15.4 $ 15.4 $ 15.5 $ 15.6 $ 15.2 $ 14.9 $ 0.5 2014 — 21.7 20.3 18.7 17.4 16.9 17.6 17.5 17.5 17.4 (0.2) 2015 — — 26.7 28.6 26.5 26.0 25.8 26.3 26.2 26.2 — 2016 — — — 29.9 28.2 24.5 24.4 24.5 24.4 24.5 — 2017 — — — — 34.1 30.0 29.0 31.5 31.1 31.2 0.3 2018 — — — — — 18.8 20.3 20.3 20.0 20.3 0.9 2019 — — — — — — 18.5 18.9 19.1 19.2 0.6 2020 — — — — — — — 19.9 18.0 18.1 5.2 2021 — — — — — — — — 24.6 22.8 11.8 2022 — — — — — — — — — 22.5 17.0 Total $ 217.1 $ 36.1 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 2.5 $ 8.1 $ 10.9 $ 12.2 $ 12.4 $ 12.7 $ 12.9 $ 13.0 $ 13.0 $ 12.9 2014 — 3.8 9.8 13.2 14.5 15.0 15.1 16.1 16.1 16.1 2015 — — 3.0 10.0 19.5 23.6 24.6 25.2 25.3 25.3 2016 — — — 5.9 14.2 17.5 20.1 22.1 23.1 23.6 2017 — — — — 4.8 12.9 19.0 23.2 24.9 26.7 2018 — — — — — 2.8 8.7 14.3 15.0 15.9 2019 — — — — — — 2.5 7.3 10.2 11.6 2020 — — — — — — — 1.9 6.3 8.4 2021 — — — — — — — — 1.9 4.4 2022 — — — — — — — — — 2.7 Total $ 147.6 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 69.5 Net reserves for loss and allocated loss adjustment expenses prior to 2013 0.9 Marine & Energy - net reserves for loss and allocated loss adjustment expenses, end of year $ 70.4 Mortgage Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 0.3 $ 0.3 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ — 2014 — 3.6 0.7 0.7 0.6 0.6 0.6 0.6 0.6 0.5 — 2015 — — 1.7 1.7 1.6 1.6 0.8 0.8 0.8 0.8 — 2016 — — — 5.9 5.5 5.8 1.4 2.2 1.9 1.7 0.3 2017 — — — — 8.0 8.4 2.2 3.1 2.5 2.4 0.8 2018 — — — — — 11.2 4.3 5.5 4.9 4.3 2.1 2019 — — — — — — 7.0 8.7 8.0 6.9 4.1 2020 — — — — — — — 12.0 11.8 7.8 5.0 2021 — — — — — — — — 11.1 7.7 5.0 2022 — — — — — — — — — 8.8 6.3 Total $ 41.0 $ 23.6 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 2014 — — 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 2015 — — 0.3 0.5 0.7 0.7 0.8 0.8 0.8 0.8 2016 — — — 0.1 0.5 0.8 1.0 1.0 1.0 1.0 2017 — — — — 0.1 0.7 1.0 1.1 1.0 1.2 2018 — — — — — 0.3 1.2 1.3 1.4 1.4 2019 — — — — — — 0.8 1.6 1.8 1.7 2020 — — — — — — — 1.4 1.5 1.3 2021 — — — — — — — — 1.1 1.1 2022 — — — — — — — — — 0.9 Total $ 10.1 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 30.9 Net reserves for loss and allocated loss adjustment expenses prior to 2013 — Mortgage - net reserves for loss and allocated loss adjustment expenses, end of year $ 30.9 Property Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 224.2 $ 247.2 $ 236.2 $ 233.0 $ 231.7 $ 231.4 $ 230.8 $ 231.2 $ 230.5 $ 230.1 $ 0.2 2014 — 198.3 203.0 201.3 205.5 205.8 205.5 205.2 205.5 205.5 (0.6) 2015 — — 210.8 208.2 212.3 212.8 211.5 211.5 211.6 211.2 (5.6) 2016 — — — 286.0 285.6 288.3 288.6 286.6 285.8 285.6 0.8 2017 — — — — 455.5 499.0 508.9 514.6 514.2 510.3 11.1 2018 — — — — — 452.8 510.1 516.9 510.0 502.4 16.6 2019 — — — — — — 515.1 500.8 500.2 483.8 27.1 2020 — — — — — — — 563.1 554.9 524.0 104.1 2021 — — — — — — — — 596.9 662.1 161.4 2022 — — — — — — — — — 334.7 171.4 Total $ 3,949.7 $ 486.5 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 55.4 $ 166.2 $ 204.4 $ 216.6 $ 220.9 $ 222.7 $ 224.3 $ 225.6 $ 225.6 $ 225.9 2014 — 49.1 136.5 170.8 187.3 193.5 197.4 198.3 199.2 199.5 2015 — — 52.5 144.2 177.1 192.8 201.0 203.3 205.3 205.8 2016 — — — 62.2 186.8 238.2 261.3 272.3 276.2 278.0 2017 — — — — 86.6 311.4 398.6 453.7 465.9 480.4 2018 — — — — — 67.9 312.8 406.6 437.9 457.9 2019 — — — — — — 67.5 291.6 380.4 414.5 2020 — — — — — — — 76.6 220.5 330.2 2021 — — — — — — — — 79.2 232.5 2022 — — — — — — — — — 45.0 Total $ 2,869.7 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 1,080.0 Net reserves for loss and allocated loss adjustment expenses prior to 2013 29.7 Property - net reserves for loss and allocated loss adjustment expenses, end of year $ 1,109.7 Insurance & Services The following tables provide a breakdown of the Company’s loss and allocated loss adjustment expenses incurred, net and net loss and allocated loss adjustment expenses paid by accident year by line of business for the Company’s Insurance & Services segment for the year ended December 31, 2022. The information related to loss and allocated loss adjustment expenses incurred, net and net loss and allocated loss adjustment expenses paid for the years ended December 31, 2013 through 2021 is presented as supplementary information and is unaudited: A&H Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 124.6 $ 122.2 $ 117.7 $ 117.2 $ 116.6 $ 115.8 $ 115.7 $ 115.5 $ 115.6 $ 115.5 $ — 2014 — 130.4 131.5 130.0 130.0 129.1 129.0 128.9 129.1 129.1 0.1 2015 — — 152.2 148.5 145.2 143.9 143.5 143.6 143.6 143.6 0.3 2016 — — — 172.3 172.0 167.9 166.4 166.2 165.8 165.9 2.3 2017 — — — — 176.5 172.6 166.0 163.8 163.6 163.9 (0.6) 2018 — — — — — 200.2 207.6 205.5 203.8 203.8 (1.6) 2019 — — — — — — 274.7 269.8 261.1 260.8 (1.5) 2020 — — — — — — — 311.3 305.4 282.8 13.7 2021 — — — — — — — — 223.1 216.3 21.2 2022 — — — — — — — — — 355.1 156.6 Total $ 2,036.8 $ 190.5 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 54.1 $ 102.7 $ 113.1 $ 114.5 $ 115.8 $ 115.2 $ 115.2 $ 115.3 $ 115.3 $ 115.3 2014 59.1 110.9 124.3 126.0 126.0 126.7 126.8 126.8 126.8 2015 75.2 129.6 141.0 142.6 142.9 143.0 143.0 143.0 2016 97.6 149.3 160.9 162.8 163.3 163.0 163.1 2017 58.8 146.9 159.5 160.3 160.7 160.8 2018 90.6 187.5 204.2 205.4 205.8 2019 130.9 235.6 252.6 255.7 2020 107.0 246.1 273.2 2021 120.6 182.8 2022 169.7 Total $ 1,796.2 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 240.6 Net reserves for loss and allocated loss adjustment expenses prior to 2013 (0.4) A&H - net reserves for loss and allocated loss adjustment expenses, end of year $ 240.2 Environmental Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — — 2015 — — — — — — — — — — — 2016 — — — — — — — — — — — 2017 — — — — — — — — — — — 2018 — — — — — 0.4 0.1 0.1 0.1 0.1 — 2019 — — — — — — 4.5 4.6 2.7 2.8 0.9 2020 — — — — — — — 3.6 3.2 3.4 2.9 2021 — — — — — — — — 4.7 4.9 3.3 2022 — — — — — — — — — 11.8 11.4 Total $ 23.0 $ 18.5 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — 2015 — — — — — — — — — — 2016 — — — — — — — — — — 2017 — — — — — — — — — — 2018 — — — — — — — 0.1 0.1 0.1 2019 — — — — — — — 0.9 1.8 1.9 2020 — — — — — — — — 0.3 0.5 2021 — — — — — — — — — 0.8 2022 — — — — — — — — — — Total $ 3.3 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 19.7 Net reserves for loss and allocated loss adjustment expenses prior to 2013 — Environmental - net reserves for loss and allocated loss adjustment expenses, end of year $ 19.7 Workers’ Compensation Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — — 2015 — — — — — — — — — — — 2016 — — — — — — — — — — — 2017 — — — — — — — — — — — 2018 — — — — — 1.5 1.5 1.1 1.2 0.6 0.2 2019 — — — — — — 18.6 16.6 15.7 15.7 1.3 2020 — — — — — — — 45.8 46.9 47.6 2.8 2021 — — — — — — — — 94.9 119.1 34.2 2022 — — — — — — — — — 97.7 67.9 Total $ 280.7 $ 106.4 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — 2015 — — — — — — — — — — 2016 — — — — — — — — — — 2017 — — — — — — — — — — 2018 — — — — — — 0.2 0.3 0.4 0.5 2019 — — — — — — 1.3 6.8 10.0 12.6 2020 — — — — — — — 4.2 19.7 29.1 2021 — — — — — — — — 10.4 43.9 2022 — — — — — — — — — 8.5 Total $ 94.6 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 186.1 Net reserves for loss and allocated loss adjustment expenses prior to 2013 — Workers’ Compensation - net reserves for loss and allocated loss adjustment expenses, end of year $ 186.1 Other Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — — 2015 — — — — — — — — — — — 2016 — — — — — — — — — — — 2017 — — — — — — — — — — — 2018 — — — — — — — — — — — 2019 — — — — — — — — — — — 2020 — — — — — — — 2.6 2.2 2.2 1.1 2021 — — — — — — — — 61.7 62.1 42.8 2022 — — — — — — — — — 238.2 213.3 Total $ 302.5 $ 257.2 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — 2015 — — — — — — — — — — 2016 — — — — — — — — — — 2017 — — — — — — — — — — 2018 — — — — — — — — — — 2019 — — — — — — — — — — 2020 — — — — — — — 0.4 0.8 0.9 2021 — — — — — — — — 1.4 12.5 2022 — — — — — — — — — 15.6 Total $ 29.0 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 273.5 Net reserves for loss and allocated loss adjustment expenses prior to 2013 2.0 Other - net reserves for loss and allocated loss adjustment expenses, end of year $ 275.5 Reconciliation of loss development information to loss and loss adjustment expense reserves The following table provides a reconciliation of the Company's loss and loss adjustment expense reserves as of December 31, 2022: 2022 Net reserves for loss and allocated loss adjustment expenses Reinsurance Aviation & Space $ 176.5 Casualty 1,334.8 Contingency 9.5 Credit & Bond 82.7 Marine & Energy 70.4 Mortgage 30.9 Property 1,109.7 Insurance & Services A&H 240.2 Environmental 19.7 Workers’ Compensation 186.1 Other 275.5 Corporate (1) 239.9 Net reserves for loss and allocated loss adjustment expenses, end of year 3,775.9 Loss and allocated loss adjustment expenses recoverable Reinsurance Aviation & Space 60.0 Casualty 9.1 Contingency 2.6 Credit & Bond 7.5 Marine & Energy 9.3 Mortgage 1.9 Property 527.3 Insurance & Services A&H 72.5 Environmental 7.6 Workers’ Compensation 121.4 Other 129.6 Corporate 427.4 Total loss and allocated loss adjustment expenses recoverable 1,376.2 Unallocated loss adjustment expense reserves 62.0 Other items, net (2) 53.6 Deferred charges on retroactive reinsurance contracts 1.0 Gross reserves for loss and loss adjustment expenses, end of year $ 5,268.7 (1) Corporate includes the results of all runoff business and is not presented in the loss development tables. (2) Includes fair value adjustments associated with the acquisition of Sirius Group. Cumulative claims frequency The reporting of cumulative claims frequency for the reserve classes within the Reinsurance and Insurance & Services segments are deemed to be impracticable as the information necessary to provide cumulative claims frequency for these reserve classes is not available to the Company. The underlying claim count is not provided for most reinsurance contracts written on a quote share or aggregate loss basis, and certain MGAs report data to the Company in an aggregate format and therefore the information necessary to provide cumulative claims is not available. Claims duration The following table is presented as supplementary information and presents the Company’s historical average annual percentage payout of loss and loss adjustment expenses incurred, net by age, as of December 31, 2022: Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 (Unaudited) Reinsurance Aviation & Space 19.1 % 23.2 % 15.3 % 8.3 % 6.4 % 2.7 % 3.4 % 0.2 % 2.4 % — % Casualty 16.3 % 20.8 % 13.0 % 10.2 % 5.8 % 3.5 % 2.1 % 1.0 % 0.7 % (0.2) % Contingency 30.3 % 26.3 % 51.8 % 13.9 % 3.6 % 1.6 % 0.1 % (1.4) % — % (19.1) % Credit & Bond 29.9 % 25.1 % 15.5 % 5.6 % 2.5 % 2.0 % 0.4 % 0.5 % 1.0 % 6.2 % Marine & Energy 14.7 % 26.9 % 20.9 % 10.1 % 4.8 % 3.2 % 2.2 % 0.1 % 0.2 % (0.2) % Mortgage 12.6 % 11.0 % 3.7 % 1.9 % 0.8 % 1.5 % 0.4 % (0.3) % (0.2) % — % Property 16.3 % 38.9 %

Third party reinsurance

Third party reinsurance	12 Months Ended
	Dec. 31, 2022
Insurance [Abstract]
Third party reinsurance	13. Third party reinsurance In the normal course of business, the Company seeks to protect its businesses from losses due to concentration of risk and losses arising from catastrophic events by reinsuring with third-party reinsurers. Additionally, retrocession can be used as a mechanism to share the risks and rewards of business written and therefore can be used as a tool to align the Company’s interests with those of its counterparties. The Company remains liable for risks reinsured in the event that the reinsurer does not honor its obligations under reinsurance contracts. The following tables provide a breakdown of the Company’s written and earned premiu ms and loss and loss adjustment expenses from direct business, reinsurance assumed and reinsurance ceded for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Written premiums: Direct $ 1,403.9 $ 718.0 $ 19.0 Assumed 2,005.8 1,518.5 569.5 Gross premiums written 3,409.7 2,236.5 588.5 Ceded (860.5) (502.3) (46.3) Net premiums written $ 2,549.2 $ 1,734.2 $ 542.2 2022 2021 2020 Premiums earned: Direct $ 1,153.6 $ 600.8 $ 1.0 Assumed 1,915.2 1,598.5 638.8 Gross premiums earned 3,068.8 2,199.3 639.8 Ceded (750.7) (482.3) (29.0) Net premiums earned $ 2,318.1 $ 1,717.0 $ 610.8 2022 2021 2020 Loss and loss adjustment expense: Direct $ 778.0 $ 349.3 $ 0.8 Assumed 1,386.8 1,506.1 483.2 Loss and loss adjustment expense incurred 2,164.8 1,855.4 484.0 Ceded (576.4) (528.9) (18.7) Loss and loss adjustment expense incurred, net $ 1,588.4 $ 1,326.5 $ 465.3 Because retrocessional reinsurance contracts do not relieve the Company of its obligation to its insureds, the collectability of balances due from the Company's reinsurers is important to its financial strength. The Company monitors the financial strength and ratings of retrocessionaires on an ongoing basis. As of December 31, 2022, the Company had loss and loss adjustment expenses recoverable of $1,376.2 million (December 31, 2021 - $1,215.3 million). Loss and loss adjustment expenses recoverable from the retrocessionaire are recorded as assets. The following tables provide a listing of the Company’s loss and loss adjustment expenses recoverable by the reinsurer's S&P rating and the percentage of total recoverables as of December 31, 2022 and 2021. With certain reinsurers, if S&P's rating was not available, an equivalent AM Best rating was used. December 31, 2022 Rating (1) (2) Gross Collateral Net % of Net AA $ 252.8 $ 41.2 $ 211.6 29.5 % A 370.6 48.5 322.1 44.9 % BBB or lower 246.7 104.8 141.9 19.8 % Not rated 506.1 464.2 41.9 5.8 % Total $ 1,376.2 $ 658.7 $ 717.5 100.0 % December 31, 2021 Rating (1) (2) Gross Collateral Net % of Net AA $ 149.5 $ 1.7 147.8 22.6 % A 360.8 16.0 344.8 52.6 % BBB or lower 212.3 130.5 81.8 12.5 % Not rated 492.7 412.0 80.7 12.3 % Total $ 1,215.3 $ 560.2 $ 655.1 100.0 % (1) S&P’s ratings as detailed above are: "AAA" (Extremely Strong), "AA" (Very strong), "A" (Strong) and "BBB" (Adequate). (2) Not rated represents reinsurers who are not rated by either S&P or AM. Best. Included in the “Not rated” category as of December 31, 2022 is $327.7 million (2021 - $355.9 million) related to Pallas Reinsurance Ltd. as a result of the 2021 LPT, and the amount is fully collateralized. The following tables provide a listing of the five highest loss and loss adjustment expenses recoverable by reinsurer, along with percentage of total recoverable amount, the reinsurer's S&P reinsurer rating and the percentage that the recoverable is collateralized as of December 31, 2022 and 2021: December 31, 2022 Balance % of Total S&P rating % Collateralized Reinsurer: Pallas Reinsurance Company Ltd. $ 327.7 23.8 % Not rated 100.0 % General Insurance Corporation of India 184.9 13.4 % BBB 31.3 % Arch Reinsurance Ltd 79.6 5.8 % A+ 1.3 % Swiss Reinsurance Company Ltd 68.6 5.0 % AA- 25.8 % Pie Casualty Insurance Company $ 44.1 3.2 % Not rated 100.0 % December 31, 2021 Balance % of Total S&P rating % Collateralized Reinsurer: Pallas Reinsurance Company Ltd. $ 355.9 29.3 % Not rated 100.0 % General Insurance Corporation of India (1) 140.9 11.6 % BBB 89.4 % Swiss Reinsurance Company, Ltd. 34.8 2.9 % AA- 13.4 % Argo Capital Group Ltd. 28.6 2.4 % Not rated 100.0 % Lloyd’s of London $ 27.4 2.3 % A+ 51.8 % (1) Reflects an AM Best rating o f "B++" (Good).

Allowance for expected credit l

Allowance for expected credit losses	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Allowance for expected credit losses	14. Allowance for expected credit losses The Company is exposed to credit losses primarily through sales of its insurance and reinsurance products and services. The financial assets in scope of the current expected credit losses impairment model primarily include the Company’s insurance and reinsurance balances receivable and loss and loss adjustment expenses recoverable. The Company pools these amounts by counterparty credit rating and applies a credit default rate that is determined based on the studies published by the rating agencies (e.g., AM Best, S&P). In circumstances where ratings are unavailable, the Company applies an internally developed default rate based on historical experience, reference data including research publications, and other relevant inputs. The Company's assets in scope of the current expected credit loss assessment as of December 31, 2022 and December 31, 2021 are as follows: December 31, December 31, 2021 Insurance and reinsurance balances receivable, net (1) $ 1,876.9 $ 1,708.2 Loss and loss adjustment expenses recoverable, net 1,376.2 1,215.3 Other assets (2) 52.4 14.5 Total assets in scope $ 3,305.5 $ 2,938.0 (1) As of December 31, 2022, one counterparty’s insurance and reinsurance balances receivable of $236.5 million exceeded 10% of the Company’s total insurance and reinsurance balances receivable (December 31, 2021 - no counterparties exceeded 10%). (2) Relates to MGA trade receivables (included in other assets in the Company’s consolidated balance sheets), loans receivables (included in other long-term investments in the Company’s consolidated balance sheets) and interest and dividend receivables. The Company’s allowance for expected credit losses was $34.3 million as of December 31, 2022 (December 31, 2021 - $21.6 million). For the year ended December 31, 2022, the Company recorded current expected credit losses of $12.7 million (2021 - $21.0 million and 2020 - $0.6 million). These amounts are included in net corporate and other expenses in the consolidated statements of income (loss). The Company monitors counterparty credit ratings and macroeconomic conditions, and considers the most current AM Best and S&P credit ratings to determine the allowance each quarter. As of December 31, 2022, approximately 55% of the total gross assets in scope were balances with counterparties rated by either AM Best or S&P and, of the total rated, 78% were rated A- or better.

Debt and letter of credit facil

Debt and letter of credit facilities	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt and letter of credit facilities	15. Debt and letter of credit facilities Debt obligations The following table represents a summar y of the Company’s debt obl igations on its consolidated balance sheets as of December 31, 2022 and December 31, 2021: December 31, 2022 December 31, 2021 Amount Effective rate (1) Amount Effective rate (1) 2017 SEK Subordinated Notes, at face value $ 264.3 6.0 % $ 303.1 4.1 % Unamortized discount (5.7) (6.8) 2017 SEK Subordinated Notes, carrying value 258.6 296.3 2016 Senior Notes, at face value 400.0 4.5 % 400.0 4.5 % Unamortized premium 4.8 6.0 2016 Senior Notes, carrying value 404.8 406.0 2015 Senior Notes, at face value 115.0 7.0 % 115.0 7.0 % Unamortized issuance costs (0.4) (0.6) 2015 Senior Notes, carrying value 114.6 114.4 Total debt $ 778.0 $ 816.7 (1) Effective rate considers the effect of the debt issuance costs, discount, and premium. 2017 SEK Subordinated Notes On September 22, 2017, Sirius Group, through SIG, issued floating rate callable subordinated notes denominated in Swedish kronor ("SEK") in the amount of SEK 2,750.0 million (or $346.1 million on date of issuance) at a 100% issue price ("2017 SEK Subordinated Notes"). The 2017 SEK Subordinated Notes were issued in an offering that was exempt from the registration requirements of the Securities Act of 1933 (the "Securities Act"). The 2017 SEK Subordinated Notes bear interest on their principal amount at a floating rate equal to the applicable Stockholm Interbank Offered Rate for the relevant interest period plus an applicable margin, payable quarterly in arrears on March 22, June 22, September 22 and December 22 of each year until maturity in September 2047. Beginning on September 22, 2022, the 2017 SEK Subordinated Notes may be redeemed, in whole or in part, at the Company’s option. As a result of the Company’s merger with SIG, the Company assumed the existing and outstanding aggregate principal amount of the 2017 SEK Subordinated Notes pursuant to the First Supplemental Subordinated Indenture, dated May 27, 2021, among SIG, the Company and The Bank of New York Mellon, as trustee (the “Trustee”). The Company was in compliance with all debt covenants as of and for the period ended December 31, 2022 . For the year ended December 31, 2022, the Company recorde d $13.2 million of interest expense, inclusive of amortization of discount, on the 2017 SEK Subordinated Notes (2021 - $11.1 million). For the year ended December 31, 2022, the Company also recognized $38.0 million of foreign exchange (losses) gains on the translation of the 2017 SEK Subordinated Notes into USD from SEK (2021 - $25.2 million). 2016 Senior Notes On N ovember 1, 2 016, Sirius Group, through SIG, is sued $400.0 million face value of senior unsecured notes ("2016 Senior Notes") at an issue price of 99.2% for net proceeds of $392.4 million after taking into effect both deferrable and non-deferrable issuance costs. The 2016 SIG Senior Notes were issued in an offering that was exempt from the registration requirements of the Securities Act. The 2016 SIG Senior Notes bear an annual interest rate of 4.6%, payable semi-annually in arrears on May 1 and November 1 of each year until maturity in November 2026. As a result of the Company’s merger with SIG, the Company assumed the existing and outstanding aggregate principal amount of the 2016 SIG Senior Notes pursuant to the Third Supplemental Senior Indenture, dated May 27, 2021, among SIG, the Company and the Trustee. The Company was in compliance with all debt covenants as of and for the period ended December 31, 2022 . For the year ended December 31, 2022, the Company recorded $17.2 million of interest expense, inclusive of amortization of premium, on the 2016 Senior Notes (2021 - $14.7 million). 2015 Senior Notes As of December 31, 2022, the Company had outstanding debt obligations consisting of an aggregate principal amount of $115.0 million of senior unsecured notes (the “2015 Senior Notes”) due February 13, 2025. The 2015 Senior Notes bear interest at 7.0% and interest is payable semi-annually on February 13 and August 13 of each year. The Company was in compliance with all debt covenants as of and for the years ended December 31, 2022 and December 31, 2021. As a result of the Company’s merger with Third Point Re (USA) Holdings Inc, the Company acquired the existing and outstanding aggregate principal amount of the 2015 Senior Notes pursuant to the Second Supplemental Indenture, dated December 31, 2021, among Third Point Re (USA) Holdings Inc, the Company and the Trustee. For the year ended December 31, 2022, the Company recorde d $8.2 million of interest expense, inclusive of amortization of issuance costs, on the 2015 Senior Notes (2021 - $8.2 million). Interest expense Total interest expense incurred by the Company for its indebtedness for the year ended December 31, 2022 was $38.6 million (2021 - $34.0 million). Standby letter of credit facilities As of December 31, 2022, the Company had entered into the following letter of credit facilities: Letters of Credit Collateral Committed Capacity Issued Cash and Cash Equivalents Debt securities Committed - Secured letters of credit facilities $ 380.0 $ 288.0 $ 15.8 $ 205.9 Uncommitted - Secured letters of credit facilities n/a 982.4 18.5 1,188.5 $ 1,270.4 $ 34.3 $ 1,394.4 The Company’s secured letter of credit facilities are bilateral agreements that generally renew on an annual basis. The letters of credit issued under the secured letter of credit facilities are fully collateralized. The above referenced facilities are subject to various affirmative, negative and financial covenants that the Company considers to be customary for such borrowings, including certain minimum net worth and maximum debt to capitalization standards. See Note 5 for additional information. Revolving credit facility In addition to the letter of credit facilities above, the Company entered into a three-year, $300.0 million senior unsecured revolving credit facility (the “Facility”) with JPMorgan Chase Bank, N.A. as administrative agent, effective February 26, 2021. The Facility includes an option, subject to satisfaction of certain conditions including agreement of lenders representing greater than a majority of commitments, for the Company to request an extension by such lenders of the maturity date of the Facility by an additional 12 months. The Facility provides access to loans for working capital and general corporate purposes, and letters of credit to support obligations under insurance and reinsurance agreements, retrocessional agreements and for general corporate purposes. Loans and letters of credit under the Facility will become available, subject to customary conditions precedent. As of December 31, 2022 , there were no outstanding borrowings under the Facility.

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income taxes	16. Income taxes The Company provides for income tax expense or benefit based upon pre-tax income or loss reported in the consolidated statements of income (loss) and the provisions of currently enacted tax laws. The Company and its Bermuda-domiciled subsidiaries are incorporated under the laws of Bermuda and are subject to Bermuda law with respect to taxation. Under current Bermuda law, the Company and its Bermuda-domiciled subsidiaries are not subject to any income or capital gains taxes in Bermuda. In the event that such taxes are imposed, the Company and its Bermuda-domiciled subsidiaries would be exempted from any such taxes until March 2035 under the Tax Assurance Certificates issued to such entities pursuant to the Bermuda Exempted Undertakings Tax Protection Act of 1966, as amended. The Company has subsidiaries and branches that operate in various other jurisdictions around the world that are subject to tax in the jurisdictions in which they operate. The jurisdictions in which the Company's subsidiaries and branches are subject to tax are Australia, Belgium, Canada, Germany, Gibraltar, Hong Kong (China), Ireland, Luxembourg, Malaysia, Singapore, Spain, Sweden, Switzerland, the United Kingdom, and the United States. The following is a summary of the Company’s income (loss) before income tax (expense) benefit by jurisdiction for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Bermuda $ (151.7) $ 178.5 $ 113.6 U.S. (47.0) 21.8 38.1 U.K. (9.7) 1.9 0.2 Sweden (174.6) (138.1) — Luxembourg (37.2) (20.5) — Other (2.5) 1.5 — Income (loss) before income tax (expense) benefit $ (422.7) $ 45.1 $ 151.9 For the years ended December 31, 2022, 2021 and 2020, income tax (expense) benefit consisted of the following: 2022 2021 2020 Current tax (expense) benefit: U.S. Federal $ 1.6 $ (3.5) $ (0.1) State (0.9) (1.8) — Non-U.S. (3.2) (18.2) — Total current tax (expense) benefit (2.5) (23.5) (0.1) Deferred tax (expense) benefit: U.S. Federal 20.7 (13.1) (8.0) State 2.0 (4.8) — Non-U.S. 16.5 52.1 — Total deferred tax (expense) benefit 39.2 34.2 (8.0) Total income tax (expense) benefit $ 36.7 $ 10.7 $ (8.1) Effective Rate Reconciliation The following table presents a reconciliation of expected income taxes to income tax (expense) benefit for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Tax (expense) benefit at the 0% Bermuda statutory rate $ — $ — $ — Differences in taxes resulting from: Non-Bermuda earnings 52.9 17.6 (8.0) Change in valuation allowance (14.3) 10.5 — Foreign currency effects (10.7) (19.0) — Change in uncertain tax positions 8.0 (8.0) (0.1) Provision-to-return true up 3.9 (0.5) — Tax rate change 2.7 4.3 — Tax on Safety Reserve (2.4) (1.0) — Non-taxable/deductible income (1.4) 7.2 — Other, net (1.3) 0.5 — State taxes expense (0.7) (0.9) — Total income tax (expense) benefit $ 36.7 $ 10.7 $ (8.1) For the year ended December 31, 2022, the non-Bermuda component of pre-tax income (loss) was $(270.8) million (2021 - $(133.5) million and 2020 - $38.3 million). The Tax Cuts and Jobs Act (“TCJA”) includes a Base Erosion and Anti-Abuse Tax (“BEAT”) provision, which is essentially a minimum tax on certain otherwise deductible payments made by U.S. entities to non-U.S. affiliates, including cross-border interest payments and reinsurance premiums paid or ceded. The statutory BEAT rate is 10% through 2025, and then rises to 12.5% in 2026 and thereafter. The TCJA also includes provisions for Global Intangible Low-Taxed Income (“GILTI”), under which taxes on foreign income are imposed on the excess of a deemed return on tangible assets of certain foreign subsidiaries. Consistent with accounting guidance, the Company will treat BEAT as an in period tax charge when incurred in future periods for which no deferred taxes need to be provided and has made an accounting policy election to treat GILTI taxes in a similar manner. No provision for income taxes related to BEAT or GILTI was recorded as of December 31, 2022 and December 31, 2021. The Company has capital and liquidity in many of its subsidiaries, some of which may reflect undistributed earnings. If such capital or liquidity were to be paid or distributed to the Company or to one of its intermediary subsidiaries as dividends or otherwise, they may be subject to withholding tax by the source country and/or income tax by the recipient country. The Company generally intends to operate, and manage its capital and liquidity, in a tax-efficient manner. However, the applicable tax laws in relevant countries are still evolving, including in connection with guidance and proposals from the Organization for Economic Cooperation and Development (OECD). Accordingly, such payments or distributions may be subject to income or withholding tax in jurisdictions where they are not currently taxed or at higher rates of tax than currently taxed, and the applicable tax authorities could attempt to apply income or withholding tax to past earnings or payments. It is not practicable to estimate the income tax liabilities that might be incurred if such earnings were remitted since it is driven by facts at the time of distribution. Deferred Tax Inventory The following table presents the tax effects of temporary differences that give rise to the deferred tax assets and deferred tax liabilities as of December 31, 2022 and 2021: December 31, December 31, 2021 Deferred tax assets: Non-U.S. net operating loss carryforwards $ 301.1 $ 273.3 Unearned premiums 22.1 13.4 U.S. federal net operating loss and capital carryforwards 17.8 19.4 Purchase accounting 16.9 17.8 Tax credit carryforwards 16.0 26.2 Investment basis differences 10.7 5.9 Discounting of loss and loss adjustment expense reserves 9.3 7.6 Unrealized losses on investments 9.0 — Incentive compensation and benefit accruals 5.8 5.7 Deferred interest 4.3 3.9 Allowance for doubtful accounts 4.0 2.9 Other items 4.0 5.2 Total gross deferred tax assets 421.0 381.3 Valuation allowance (114.3) (113.3) Total adjusted deferred tax asset $ 306.7 $ 268.0 Deferred tax liabilities: Safety reserve $ 126.5 $ 150.1 Deferred acquisition costs 22.5 6.7 Intangible assets 13.4 14.3 Foreign currency translation on investments 0.9 1.7 Unrealized gains on investments — 3.8 Other Items 2.9 4.8 Total deferred tax liabilities 166.2 181.4 Net deferred tax assets $ 140.5 $ 86.6 Of the net deferred tax asset, net of valuation allowance, of $140.5 million as of December 31, 2022, $70.9 million relates to net deferred tax assets in U.S. subsidiaries, $129.6 million relates to net deferred tax assets in Luxembourg subsidiaries, $5.2 million relates to net deferred tax liabilities in UK subsidiaries, $53.9 million relates to net deferred tax liabilities in Sweden subsidiaries, and $0.9 million relates to net deferred tax liabilities in other jurisdictions. The Company records a valuation allowance against deferred tax assets if it becomes more likely than not that all or a portion of deferred tax assets will not be realized. Changes in valuation allowances from period to period are included in income tax expense in the period of change. In determining whether or not a valuation allowance, or change therein, is warranted, the Company considers factors such as prior earnings history, expected future earnings, carryback and carryforward periods and strategies that if executed would result in the realization of a deferred tax asset. It is possible that certain planning strategies or projected earnings in certain subsidiaries may not be feasible to utilize the entire deferred tax asset, which could result in material changes to the Company's deferred tax assets and tax expense. Based on this approach, for the year ended December 31, 2022, the Company recorded $114.3 million in the valuation allowance applicable to deferred tax assets. Of the $114.3 million, $69.4 million relates to net operating loss carryforwards in Luxembourg subsidiaries, $38.5 million relates primarily to net operating loss carryforward in the United Kingdom and $6.4 million relates to foreign tax credits in the United States. Net Operating Loss and Capital Loss Carryforwards Net operating loss and capital loss carryforwards as of December 31, 2022, the expiration dates and the deferred tax assets thereon are as follows: December 31, 2022 United States Luxembourg Sweden U.K. Total 2023-2027 $ 3.0 $ — $ — $ — $ 3.0 2028-2042 63.0 74.8 — — 137.8 No expiration date 21.1 723.6 312.1 150.3 1,207.1 Total 87.1 798.4 312.1 150.3 1,347.9 Gross deferred tax asset 18.0 199.1 64.3 37.6 319.0 Valuation allowance — (69.4) — (37.6) (107.0) Net deferred tax asset $ 18.0 $ 129.7 $ 64.3 $ — $ 212.0 The Company expects to utilize net operating loss carryforwards in Luxembourg of $524.1 million but does not expect to utilize the remainder based on forecasted taxable income. The U.S. net operating loss carryforwards of $87.1 million are subject to an annual limitation on utilization under Internal Revenue Code Section 382. Of the Section 382 limited loss carryforwards, $3.0 million will expire between 2023 and 2025, $63.0 million will expire between 2036 and 2039 and the remaining $21.1 million does not expire. The Company expects to utilize all of the U.S. net operating loss carryforwards. Foreign Tax Credits As of December 31, 2022, there are U.S. foreign tax credits carryforwards available of $8.1 million, of which minimal amount expires in 2023 and the remaining will expire between 2024 and 2031. As of December 31, 2022, there are alternative minimum tax credit carryforwards of $0.1 million which do not expire and are expected to become fully refundable beginning in the 2024 tax year under the TCJA. Further, there are Swedish foreign tax credits carryforwards available of $7.8 million and will start to expire in 2026. Uncertain Tax Positions Recognition of the benefit of a given tax position is based upon whether a company determines that it is more likely than not that a tax position will be sustained upon examination based upon the technical merits of the position. In evaluating the more likely than not recognition threshold, the Company must presume that the tax position will be subject to examination by a taxing authority with full knowledge of all relevant information. If the recognition threshold is met, then the tax position is measured at the largest amount of benefit that is more than 50% likely of being realized upon ultimate settlement. The following table is a reconciliation of the beginning and ending unrecognized tax benefits for the years ended December 31, 2022 and 2021: Permanent differences (1) Temporary differences (2) Interest and penalties (3) Total Balance as of January 1, 2021 $ 1.1 $ — $ 0.5 $ 1.6 Acquisition of Sirius Group 0.7 0.1 0.1 0.9 Changes in prior year tax positions (0.1) (0.1) 0.1 (0.1) Tax positions taken during the current year 8.0 0.3 — 8.3 Balance as of December 31, 2021 9.7 0.3 0.7 10.7 Changes in prior year tax positions (8.0) (0.3) — (8.3) Lapse in statute of limitations (0.1) — — (0.1) Balance as of December 31, 2022 $ 1.6 $ — $ 0.7 $ 2.3 (1) Represents the amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate. (2) Represents the amount of unrecognized tax benefits that, if recognized, would create a temporary difference between the reported amount of an item in the consolidated balance sheets and its tax basis. (3) Net of tax benefit. As of December 31, 2022, the total reserve for unrecognized tax benefits is $2.3 million. If the Company determines in the future that its reserves for unrecognized tax benefits on permanent differences and interest and penalties are not needed, the reversal of $1.6 million of such reserves as of December 31, 2022 would be recorded as an income tax benefit and would impact the effective tax rate. The Company classifies all interest and penalties on unrecognized tax benefits as part of income tax expense. During the year ended December 31, 2022, the Company did not recognize interest expense, net of any tax benefit (2021 - $0.1 million and 2020 - none). As of December 31, 2022, the balance of accrued interest, net of any tax benefit, is $0.7 million (2021 - $0.7 million). Tax Examinations With few exceptions, which are not material, the Company is no longer subject to U.S. federal, state or non-U.S. income tax examinations by tax authorities for years before 2018.

Shareholders' equity

Shareholders' equity	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Shareholders' equity	17. Shareholders' equity Common shares The following table presents a summary of the common shares issued and outstanding as of and for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Common shares issued and outstanding, beginning of year 161,929,777 95,582,733 94,225,498 Issuance of common shares, net of forfeitures and shares withheld 942,923 3,133,969 1,012,939 Shares repurchased (695,047) — — Options exercised — 220,000 — Performance restricted shares granted, net of forfeitures and shares withheld — (1,431,963) 344,296 Issuance of common shares for Sirius Group acquisition — 58,331,196 — Issuance of common shares to related party — 6,093,842 — Common shares issued and outstanding, end of year 162,177,653 161,929,777 95,582,733 The Company’s authorized share capital consists of 300,000,000 common shares with a par value of $0.10 each. During the years ended December 31, 2022, 2021 and 2020, the Company did not pay any dividends to its common shareholders. Preference shares The Company’s authorized share capital also consists of 30,000,000 preference shares with a par value of $0.10 each. Series B preference shares The Company has 8,000,000 of Series B preference shares outstanding, par value $0.10. Dividends on the Series B preference shares will be cumulative and payable quarterly in arrears at an initial rate of 8.0% per annum. The preference shareholders will have no voting rights with respect to the Series B preference shares unless dividends have not been paid for six dividend periods, whether or not consecutive, in which case the holders of the Series B preference shares will have the right to elect two directors. The dividend rate will reset on each five-year anniversary of issuance at a rate equal to the five-year U.S. treasury rate at such time plus 7.298%. The Series B preference shares are perpetual and have no fixed maturity date. The Series B preference shares will provide for redemption rights by the Company (i) in whole, or in part, on each five-year anniversary of issuance at 100%, (ii) in whole, but not in part, (a) upon certain rating agency events, at 102%, (b) upon certain capital disqualification events, at 100%, and (c) upon certain tax events, at 100%. On June 28, 2021 and August 12, 2021, the Company entered into Underwriting Agreements with the Series B preference shareholders (the “Selling Shareholders”) pursuant to which the Selling Shareholders sold to the public market an aggregate of 8,000,000 Series B preference shares. The Company did not receive any proceeds from the sale of the Series B preference shares by the Selling Shareholders. The transaction did not change the underlying conditions of the Series B preference shares. The Series B preference shares are listed on the New York Stock Exchange under the symbol “SPNT PB”. During the year ended December 31, 2022, the Company declared and paid dividends of $16.0 million (2021 - $12.1 million) to the Series B preference shareholders. Share repurchases On February 28, 2018, the Company’s Board of Directors authorized the repurchase of an additional $148.3 million common shares, which together with the authorized amount remaining under the previously announced share repurchase program would allow the Company to repurchase up to $200.0 million of the Company’s outstanding common shares in the aggregate. On August 5, 2021, the Company’s Board of Directors expanded the scope of the prior authority to include the repurchase of outstanding CVRs and warrants. Under the common share repurchase program, the Company may repurchase shares from time to time in privately negotiated transactions or in open-market purchases in accordance with all applicable securities laws and regulations, including Rule 10b-18 of the Securities Exchange Act of 1934, as amended. During the year ended December 31, 2022, the Company repurchased 695,047 of its common shares in the open market for $5.0 million at a weighted average cost, including commissions, of $7.17 per share. Common shares repurchased by the Company during the period were retired. As of December 31, 2022 the Company was authorized to repurchase up to an aggreg ate of $56.3 million of outstanding common shares, CVRs and warrants under its repurchase program.

Share-based compensation and em

Share-based compensation and employee benefit plans	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Share-based compensation and employee benefit plans	18. Share-based compensation and employee benefit plans Share-based compensation As of December 31, 2022, the Company’s share-based awards consisted of Restricted Share Units (“RSUs”), Performance Share Units (“PSUs”), Restricted Share Awards (“RSAs”) and options. As part of the 2022-2024 annual long-term incentive award cycle, the Company granted to its employees a number of RSUs pursuant to the terms and conditions of the SiriusPoint Ltd. 2013 Omnibus Incentive Plan. The RSUs generally vest over three years in equal, one-third installments on each anniversary of the award grant date subject to continued provision of services through the applicable vesting date. As of December 31, 2022, 17,018,916 (December 31, 2021 - 18,532,406) of the Company’s common shares were available for future issuance under the equity incentive compensation plans. The total share-based compensation expense recognized during the years ended December 31, 2022, 2021 and 2020 was $26.8 million, $22.6 million and $6.6 million, respectively. As of December 31, 2022, the Company had $24.2 million (December 31, 2021 - $37.0 million) of unamortized share compensation expense, which is expected to be amortized over a weighted average period of 1.7 years (December 31, 2021 - 2.4 years). Restricted Share Units RSU activity for the year ended December 31, 2022 was as follows: Number of non- Weighted Balance as of January 1, 2022 3,428,888 $ 10.14 Granted 4,928,981 6.53 Forfeited (1,214,252) 5.89 Vested (1,982,204) 9.85 Balance as of December 31, 2022 5,161,413 $ 7.29 RSUs with service condition vest either ratably or at the end of the required service period and contain certain restrictions during the vesting period, relating to, among other things, forfeiture in the event of termination of employment or service and transferability. Restricted Share Awards Restricted share award activity for the year ended December 31, 2022 was as follows: Number of non- Weighted Balance as of January 1, 2022 2,590,194 $ 10.13 Granted 237,118 6.01 Forfeited (292,989) 8.80 Vested (825,715) 10.22 Balance as of December 31, 2022 1,708,608 $ 7.40 RSAs vest either ratably or at the end of the required service period and contain certain restrictions during the vesting period, relating to, among other things, forfeiture in the event of termination of employment or service and transferability. Performance Share Units PSU activity for the year ended December 31, 2022 was as follows: Number of non- Number of non- Weighted average grant date fair value of PSUs probable of vesting Balance as of January 1, 2022 1,085,294 1,085,294 $ 10.30 Granted — — — Forfeited (495,502) (495,502) 10.33 Vested (13,114) (13,114) 10.36 Balance as of December 31, 2022 576,678 576,678 $ 9.85 PSUs vest over four distinct performance periods subject to participant’s continued provision of services to the Company until the vesting date. Options The share options issued to management under the Share Incentive Plan are subject to a service condition. The fair value of share options issued were estimated on the grant date using the Black-Scholes option-pricing model. The Black-Scholes option-pricing model used the following assumptions for options granted during the year ended December 31, 2022 and December 31, 2021 (there were no options granted for the year ended December 31, 2020): 2022 2021 Dividend yield — % — % Risk free interest rate 3.57 % 1.55 % Expected volatility (1) 32.30 % 34.17 % Expected life (in years) 6.3 6.5 Weighted average grant date fair value $1.93 $3.28 (1) The volatility assumption used was based on the average estimated volatility of a reinsurance peer group. The options activity for the years ended December 31, 2022 were as follows: Number of Weighted Outstanding as of January 1, 2022 7,087,095 $ 12.61 Granted 2,905,709 6.94 Forfeited and expired (4,650,065) 12.92 Exercised — — Outstanding as of December 31, 2022 5,342,739 9.25 Exercisable as of December 31, 2022 2,781,527 $ 11.01 As of December 31, 2022 the weighted average remaining contractual term for options outstanding and exercisable was 4.0 years and 1.6 years, respectively (2021 - 2.0 years and 2.1 years, respectively). As of December 31, 2022, the aggregate intrinsic value of options outstanding and options exercisable was immaterial (December 31, 2021 - nil). For the year ended December 31, 2022, the Company did not receive proceeds from the exercise of options (2021 - $2.2 million). Employee Benefit Plans The Company operates several retirement plans in accordance with the local regulations and practices. These plans cover substantially all of the Company’s employees and provide benefits to employees in event of death, disability, or retirement. Defined benefit plans Swedish and German employees of SiriusPoint International can participate in defined benefit plans which are based on the employees' pension entitlements and length of employment. In Sweden, where a defined benefit pension plan is mandated by the government, SiriusPoint International's employees participate in collective agreements funded by SiriusPoint International. These collective agreements are managed by third party trustees who calculate the pension obligation, invoice SiriusPoint International for additional funding and invest the funds. All employees in Germany are covered by defined benefit pension plans sponsored by SiriusPoint International called SiriusPoint Re GmbH Pension Plan. Paid pension premiums are invested with Skandia Liv for employees in Sweden and with Allianz for employees in Germany. As of December 31, 2022, the projected benefit obligation of SiriusPoint International’s various benefit plans was $18.3 million (2021 - $20.4 million) and the funded status was $6.0 million (2021 - $2.3 million). As of December 31, 2022, the Swedish plan had a funded status of $7.6 million (2021 - $6.0 million) and the German plan had a funded status of $(1.6) million (2021 - $(3.7) million). The accumulated benefit obligation for the year ended December 31, 2022 was $13.5 million (2021 - $20.4 million). Defined contribution plans In the United Kingdom, SiriusPoint International contributes 12% of the employee's salary. Contributed funds are invested into an annuity of the employee's choice. In Belgium, SiriusPoint International contributes 6.5% - 8.5% of the employee's salary. In Switzerland, employees are eligible to participate in an industry-sponsored pension plan, which is a combination of a defined contribution and a defined benefit plan. SiriusPoint International incurs 60% - 70% of the total premium charges and the employees incur the remaining 30% - 40%. In Sweden, the insurance industry’s occupational pension plan is a

Earnings (loss) per share avail

Earnings (loss) per share available to SiriusPoint common shareholders	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings (loss) per share available to SiriusPoint common shareholders	19. Earnings (loss) per share available to SiriusPoint common shareholders The following sets forth the computation of basic and diluted earnings (loss) per share available to SiriusPoint common shareholders for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Weighted-average number of common shares outstanding: ($ in millions, except share and per share amounts) Basic number of common shares outstanding 160,228,588 148,667,770 92,510,090 Dilutive effect of options — — — Dilutive effect of warrants — — — Dilutive effect of restricted share units — 1,488,696 447,709 Diluted number of common shares outstanding 160,228,588 150,156,466 92,957,799 Basic earnings (loss) per common share: Net income (loss) available to SiriusPoint common shareholders $ (402.8) $ 44.6 $ 143.5 Net income allocated to SiriusPoint participating common shareholders — (3.4) (1.1) Net income (loss) allocated to SiriusPoint common shareholders $ (402.8) $ 41.2 $ 142.4 Basic earnings (loss) per share available to SiriusPoint common shareholders $ (2.51) $ 0.28 $ 1.54 Diluted earnings (loss) per common share: Net income (loss) available to SiriusPoint common shareholders $ (402.8) $ 44.6 $ 143.5 Net income allocated to SiriusPoint participating common shareholders — (3.4) (1.1) Net income (loss) allocated to SiriusPoint common shareholders $ (402.8) $ 41.2 $ 142.4 Diluted earnings (loss) per share available to SiriusPoint common shareholders $ (2.51) $ 0.27 $ 1.53 For the years ended December 31, 2022, 2021 and 2020, options of 4,257,266, 7,087,095 and 3,741,266, respectively, and warrants of 31,123,755, 31,123,755 and 3,494,979, respectively, were excluded from the computation of diluted earnings (loss) per share available to SiriusPoint common shareholders.

Related party transactions

Related party transactions	12 Months Ended
	Dec. 31, 2022
Related Party Transactions [Abstract]
Related party transactions	20. Related party transactions In addition to the transactions disclosed in Notes 7 and 11 to these consolidated financial statements, the following transactions are classified as related party transactions, as the counterparties have either a direct or indirect shareholding in the Company or the Company has an investment in such counterparty. (Re)insurance contracts Insurance and reinsurance contracts with certain of the Company’s insurance and MGA related parties resulted in gross written premiums of $336.4 million during the year ended December 31, 2022 (2021 - $214.0 million). As of December 31, 2022, the Company had total receivables from these related parties of $59.6 million and payables of $4.6 million (2021 - $35.6 million and no payables). Investments managed by related parties The following table provides the fair value of the Company's investments managed by related parties as of December 31, 2022 and December 31, 2021: December 31, 2022 December 31, 2021 Third Point Enhanced LP $ 100.3 $ 878.2 Third Point Venture Offshore Fund I LP 26.0 31.4 Third Point Venture Offshore Fund II LP 2.5 — Investments in related party investment funds, at fair value 128.8 909.6 Third Point Optimized Credit Portfolio (1)(2) 530.7 — Total investments managed by related parties $ 659.5 $ 909.6 (1) The Third Point Optimized Credit Portfolio is reported in debt securities available for sale and trading in the consolidated balance sheets. (2) Includes $59.9 million of asset-backed securities withdrawn as a redemption in-kind from the TP Enhanced Fund. As of December 31, 2022 , $350.0 million of withdrawals from the TP Enhanced Fund remain to be reinvested in, or contractually committed to, the TPOC Portfolio or other Third Point strategies, pursuant to the 2022 LPA. Management, advisory and performance fees to related parties The total management, advisory and performance fees to related parties for the years ended December 31, 2022, 2021 and 2020 were as follows: 2022 2021 2020 Management and advisory fees $ 7.3 $ 17.9 $ 14.5 Performance fees - fixed income and other investments (1) — — 14.0 Performance fees (before loss carryforward) (1.2) 75.7 51.8 Performance fees - loss carryforward utilized — — (0.5) Total management and performance fees to related parties (2) $ 6.1 $ 93.6 $ 79.8 (1) Pursuant to the terms of the 2020 LPA, the performance of certain fixed income and other investments managed by Third Point LLC were subject to 20% performance fees for the year ended December 31, 2020 only. (2) Management, advisory and performance fees for the Related Party Investment Funds, where applicable, are presented within net realized and unrealized investment gains from related party investment funds in the consolidated statements of income (loss) Management and advisory fees Third Point Enhanced LP Effective January 1, 2019, SiriusPoint and SiriusPoint Bermuda entered into the Second Amended and Restated Exempted Limited Partnership Agreement (the “2019 LPA”) of TP Enhanced Fund. Pursuant to the 2019 LPA, Third Point LLC is entitled to receive monthly management fees. Management fees are charged at the TP Enhanced Fund level and are calculated based on 1.25% of the investment in TP Enhanced Fund and multiplied by an exposure multiplier computed by dividing the average daily investment exposure leverage of the TP Enhanced Fund by the average daily investment exposure leverage of the Third Point Offshore Master Fund L.P. (“Offshore Master Fund”). Third Point LLC also serves as the investment manager for the Offshore Master Fund. The 2020 LPA, effective February 26, 2021, removed the adjustment for investment exposure leverage in the management fee calculation, as previously adjusted for under the 2019 LPA. The 2020 LPA did not amend the management fee rate of 1.25% per annum. The 2022 LPA, effective February 23, 2022, did not amend the management fee rate of 1.25% per annum. Third Point Venture Offshore Fund I LP No management fees are payable by the Company under the 2021 Venture LPA . Third Point Venture Offshore Fund II LP Pursuant to the 2022 Venture II LPA , m anagement fees are charged at the TP Venture Fund II level and are calculated based on 0.1875% per quarter (0.75% per annum). Third Point Insurance Portfolio Solutions and Third Point Optimized Credit Effective February 26, 2021, Third Point LLC, Third Point Insurance Portfolio Solutions (“TPIPS”) and the Company entered into an Investment Management Agreement (the “TPIPS IMA”), pursuant to which TPIPS will serve as investment manager to the Company and provide investment advice with respect to the investable assets of the Company, other than assets that the Company may withdraw from time to time as working capital. The Amended and Restated Collateral Assets Investment Management Agreement was terminated at the effective date of the TPIPS IMA. Pursuant to the TPIPS IMA, the Company will pay Third Point LLC a fixed management fee, payable monthly in advance, equal to 1/12 of 0.06% of the fair value of assets managed (other than assets invested in TP Enhanced Fund). On February 23, 2022, the Company entered into the 2022 IMA with Third Point LLC and the other parties thereto, which amended and restated the TPIPS IMA. Pursuant to the 2022 IMA, effective February 23, 2022, the Company will also pay Third Point LLC a monthly management fee equal to one twelfth of 0.50% (0.50% per annum) of the TPOC Portfolio, net of any expenses, and a fixed advisory fee of $1.5 million per annum. Performance fees Third Point Enhanced LP Pursuant to the 2019 LPA, TP GP receives a performance fee allocation equal to 20% of the Company’s investment income in the related party investment fund. The performance fee is included as part of “Investments in related party investment fund, at fair value” on the Company’s consolidated balance sheet since the fees are charged at the TP Enhanced Fund level. The performance fee is subject to a loss carryforward provision pursuant to which TP GP is required to maintain a loss recovery account, which represents the sum of all prior period net loss amounts and not subsequently offset by prior year net profit amounts, and that is allocated to future profit amounts until the loss recovery account has returned to a positive balance. Until such time, no performance fees are payable, provided that the loss recovery account balance shall be reduced proportionately to reflect any withdrawals from TP Enhanced Fund. The 2019 LPA preserves the loss carryforward attributable to our investment in TP Enhanced Fund when contributions to TP Enhanced Fund are made within nine months of certain types of withdrawals from TP Enhanced Fund. Pursuant to the 2020 LPA, the performance of certain fixed income and other investments managed by Third Point LLC were included when calculating the performance fee allocation and loss recovery account amounts under the terms of the 2019 LPA for the year ended December 31, 2020 only. There are no other changes to the performance fee calculation under the 2020 LPA. The 2022 LPA did not amend the performance fee calculation. Third Point Venture Offshore Fund I LP Pursuant to the 2021 Venture LPA, TP Venture GP receives a performance fee allocation equal to 20% of the Company’s investment income in the related party investment fund. Third Point Venture Offshore Fund II LP Pursuant to the 2022 Venture II LPA , TP Venture GP II receives a performance fee allocation equal to 20% of the Company’s investment income in the related party investment fund. Third Point Optimized Credit Pursuant to the 2022 IMA, the Company will pay Third Point LLC, from the assets of each sub-account, an annual incentive fee equal to 15% of outperformance over a specified benchmark. The performance fee is included as part of Net investment income on the Company’s consolidated statements of income (loss) .

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	21. Commitments and contingencies Concentrations of credit risk The Company has exposure to credit risk as it relates to its business written through brokers, if any of the Company’s brokers are unable to fulfill their contractual obligations with respect to payments to the Company. In addition, in some jurisdictions, if the broker fails to make payments to the insured under the Company’s policy, the Company may remain liable to the insured for the deficiency. These brokers are fairly large and well established, and there are no indications they are financially distressed. The Company’s exposure to such credit risk is somewhat mitigated in certain jurisdictions by contractual terms. The following table sets forth the Company’s premiums written by source that individually contributed more than 10% of total gross premiums written for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Aon Corporation and subsidiaries $ 625.5 18.3 % $ 536.6 24.0 % $ 189.1 32.1 % Guy Carpenter & Company and subsidiaries 441.9 13.0 % 414.1 18.5 % 164.6 28.0 % Arthur J. Gallagher & Co. and subsidiaries 216.8 6.4 % 244.2 10.9 % 67.6 11.5 % Other 2,125.5 62.3 % 1,041.6 46.6 % 167.2 28.4 % $ 3,409.7 100.0 % $ 2,236.5 100.0 % $ 588.5 100.0 % The Company is exposed to credit risk through reinsurance contracts with companies that write credit risk insurance. The Company’s portfolio of risk is predominantly U.S. mortgage insurance and mortgage credit risk transfer. The Company provides its clients in these lines of business with reinsurance protection against credit deterioration, defaults or other types of financial non-performance. Loss experience in these lines of business has been very good but is cyclical and is affected by the state of the general economic environment. The Company proactively manages the risks associated with these credit-sensitive lines of business by closely monitoring its risk aggregation and by diversifying the underlying risks where possible. The Company has bought some retrocessional coverage against a subset of these risks. The Company has exposure to credit risk related to balances receivable under our reinsurance contracts, including funds withheld and premiums receivable, and the possibility that counterparties may default on their obligations to the Company. The risk of counterparty default is partially mitigated by the fact that any amount owed from a reinsurance counterparty would be netted against any losses or acquisition costs the Company would pay in the future. The Company monitors the collectability of these balances on a regular basis. Lloyd's Central Fund The Lloyd's Central Fund is available to satisfy claims if a member of Lloyd's is unable to meet its obligations to policyholders. The Company has an obligation to pay contributions to the Lloyd's Central Fund each year based on gross written premium. The Company estimates the Lloyd's Central Fund contributions to be $0.6 million (based on the December 31, 2022 GBP to USD exchange rate) which is 0.35% of gross written premium. The Council of Lloyd's have the power to levy an additional contribution on members if it considered necessary, and the maximum additional contribution is currently 5.0% of capacity. Financing See Note 15 for additional information related to the Company’s debt obligations. Letters of Credit See Note 15 for additional information related to the Company’s letter of credit facilities. Liability-classified capital instruments See Note 3 for additional information related to the contingent value consideration components of the Sirius Group acquisition. Promissory Note & Loan Agreement On September 16, 2020, the Company entered into an Unsecured Promissory Note agreement with Arcadian, pursuant to which the Company has committed to loan up to $18.0 million. Interest shall accrue and be computed on the aggregate principal amount drawn and outstanding at a rate of 8.0% per annu m. No amou nts were drawn as of December 31, 2022. On July 2, 2021, the Company entered into a loan and security agreement with Joyn, pursuant to which the Company has lent Joyn $11.5 million. In the year ended December 31, 2022 , $1.4 million of unsecured promissory notes were also issued by Joyn to the Company, of which $0.3 million was subsequently repaid. As a part of Joyn’s recapitalization in December 2022, all outstanding promissory notes and the loan were converted into equity. On March 7, 2022, the Company entered into an Unsecured Convertible Promissory Note agreement with Player’s Health, pursuant to which the Company has lent $8.0 million. Interest shall accrue and be computed on the aggregate principal amount drawn and outstanding at a rate of 6.0% per annu m. Restructuring Plan On November 2, 2022, the Company announced a restructuring of our underwriting platform to support the future shape of our business. In line with our strategy to strengthen underwriting results and align our operating platform to our business portfolio, we have made changes to the structure and composition of our international branch network (the "Restructuring Plan"). In the fourth quarter of 2022, the Company incurred approximately $30.0 million of costs to implement the Restructuring Plan, which primarily related to severance expense. These costs were included as part of net corporate and other expenses consolidated statements of income (loss) . Litigation From time to time in the normal course of business, the Company may be involved in formal and informal dispute resolution procedures, which may include arbitration or litigation, the outcomes of which determine the rights and obligations under the Company’s reinsurance and insurance contracts and other contractual agreements. In some disputes, the Company may seek to enforce its rights under an agreement or to collect funds owed to it. In other matters, the Company may resist attempts by others to collect funds or enforce alleged rights. The Company may also be involved, from time to time in the normal course of business, in formal and informal dispute resolution procedures that do not arise from, or are not directly related to, claims activity. The Company believes that no individual litigation or arbitration to which it is presently a party is likely to have a material adverse effect on its results of operations, financial condition, business or operations. Leases The Company operates in Bermuda, the United States and Europe, and leases office space under various non-cancelable operating lease agreements. During the year ended December 31, 2022, the Company recognized operating lease expense of $12.8 million (2021 - $10.5 million and 2020 - $0.9 million), including property taxes and routine maintenance expense as well as rental expenses related to short term leases. As of December 31, 2022 the Company had $25.9 million (December 31, 2021 - $27.4 million) of operating lease right-of-use assets included in other assets accounts payable, accrued expenses and other liabilities The following table presents the lease balances within the consolidated balance sheets as of December 31, 2022 and 2021: December 31, December 31, 2021 Operating lease right-of-use assets $ 25.9 $ 27.4 Operating lease liabilities $ 30.3 $ 32.5 Weighted average lease term (years) 5.5 5.0 Weighted average discount rate 3.1 % 2.4 % Future minimum rental commitments as of December 31, 2022 under these leases are expected to be as follows: Future Payments 2023 $ 9.2 2024 5.9 2025 4.6 2026 3.7 2027 and thereafter 9.7 Total future annual minimum rental payments 33.1 Less: present value discount (2.8) Total lease liability as of December 31, 2022 $ 30.3

Statutory requirements

Statutory requirements	12 Months Ended
	Dec. 31, 2022
Insurance [Abstract]
Statutory requirements	22. Statutory requirements The Company’s insurance and reinsurance operations are subject to regulation and supervision in each of the jurisdictions where they are domiciled and licensed to conduct business. These regulations include certain restrictions on the amount of dividends or other distributions available to shareholders without prior approval of the insurance regulatory authorities. Statutory accounting differs from GAAP by jurisdiction in the reporting of certain reinsurance contracts, investments, subsidiaries, acquisition expenses, fixed assets, deferred income taxes, and certain other items. Bermuda The Insurance Act 1978 of Bermuda and related regulations, as amended ("Insurance Act"), regulates the insurance business of Bermuda-domiciled insurers and reinsurers. The Insurance Act imposes solvency and liquidity standards on Bermuda insurance companies, as well as auditing and reporting requirements. Under the Insurance Act, insurers and reinsurers are required to maintain minimum statutory capital and surplus at a level equal to the greater of a minimum solvency margin ("MSM") and the Enhanced Capital Requirement ("ECR") which is established by reference to either a Bermuda Solvency Capital Requirement ("BSCR") model or an approved internal capital model. The BSCR model is a standardized statutory risk-based capital model that provides a method for determining an insurer's minimum required capital taking into account the risk characteristics of different aspects of the company's business. The Economic Balance Sheet (“EBS”) is an input to the BSCR which determines the Company’s ECR. The EBS regime prescribes the use of financial statements prepared in accordance with GAAP as the basis on which statutory financial statements are prepared, and those statutory financial statements form the starting basis for the EBS. The model also requires insurers to estimate insurance technical provisions, which consist of the insurer’s insurance related balances valued based on best-estimate cash flows, adjusted to reflect the time value of money, with the addition of a risk margin to reflect the uncertainty in the underlying cash flows. The BMA has established a target capital level which is set at 120% of the ECR. While the Company is not required to maintain statutory economic capital and surplus at this level, it serves as an early warning signal for the BMA, and failure to meet the target capital level may result in additional reporting requirements or increased regulatory oversight. The BMA acts as the group supervisor for the Company. The Company is currently completing its group BSCR for the year ended December 31, 2022, which must be filed with the BMA on or before May 31, 2023, and at this time, the Compan y believes it will exceed the tar get level of required statutory economic capital and surplus. During 2022 and 2021, the Company did not pay a ny dividends to its common shareholders. The Company has two Bermuda based insurance subsidiaries: SiriusPoint Bermuda, a Class 4 insurer, and Alstead Re, a Class 3A insurer. Each of these Bermuda insurance subsidiaries are registered under the Insurance Act and are subject to regulation and supervision of the BMA. The Company is currently completing its BSCRs for SiriusPoint Bermuda and Alstead Re for the year ended December 31, 2022, which must be filed with the BMA on or before April 30, 2023, and at this time, the Company believes it will exceed the target level of required statutory economic capital and surplus. Each of the Company’s Bermuda based insurance subsidiaries met their target level of required statutory economic capital and surplus for the year ended December 31, 2021. The following is a summary of available and required statutory economic capital and surplus of the Bermuda based insurance subsidiaries as of December 31, 2021: December 31, 2021 Available statutory economic capital and surplus SiriusPoint Ltd. $ 3,119.1 SiriusPoint Bermuda 3,333.5 Alstead Re 4.6 Required statutory economic capital and surplus SiriusPoint Ltd. 1,558.3 SiriusPoint Bermuda 1,531.6 Alstead Re $ 1.6 The following is a summary of the statutory net income (loss) for the Bermuda based insurance subsidiaries for the years ended December 31, 2022 and 2021: 2022 2021 SiriusPoint Bermuda $ (360.1) $ 90.6 Alstead Re $ 0.9 $ (0.4) The Bermuda based insurance subsidiaries are also required to maintain a minimum liquidity ratio whereby the value of their relevant assets are not less than 75% of the amount of their relevant liabilities for general business. As of December 31, 2022, all liquidity ratio requirements were met. SiriusPoint Bermuda ’s ability to pay dividends is limited under Bermuda law and regulations. SiriusPoint Bermuda may declare dividends subject to it continuing to meet its solvency and capital requirements, which includes continuing to hold statutory capital and surplus equal to or exceeding its ECR. In addition, SiriusPoint Bermuda is prohibited from declaring or paying in any fiscal year dividends of more than 25% of its prior year’s statutory capital and surplus unless SiriusPoint Bermuda files with the BMA a signed affidavit by at least two members of the Board of Directors attesting that a dividend would not cause SiriusPoint Bermuda to fail to meet its capital requirements. As of December 31, 2022, SiriusPoint Bermuda could pay dividends of approximately $713.5 million (2021 - $844.4 million) without providing an affidavit to the BMA. SiriusPoint Bermuda indirectly owns SiriusPoint International, SiriusPoint America, and SiriusPoint’s other insurance and reinsurance operating companies, each of which are limited in their ability to pay dividends by the insurance laws of their relevant jurisdictions. Europe The financial services industry in the United Kingdom is dual-regulated by the Financial Conduct Authority and the Prudential Regulation Authority (collectively, the "U.K. Regulators"). The U.K. Regulators regulate insurers, insurance intermediaries and Lloyd's. The U.K. Regulators and Lloyd's have common objectives in ensuring that the Lloyd's market is appropriately regulated. Lloyd's is required to implement certain rules prescribed by the U.K. Regulators by the powers it has under the Lloyd's Act of 1982 relating to the operation of the Lloyd's market. In addition, each year the U.K. Regulators require Lloyd's to satisfy an annual solvency test that measures whether Lloyd's has sufficient assets in the aggregate to meet all the outstanding liabilities of its members. Lloyd's permits its corporate and individual members ("Members") to underwrite insurance risks through Lloyd's syndicates. Members of Lloyd's may participate in a syndicate for one or more underwriting years by providing capital to support the syndicate's underwriting. All syndicates are managed by Lloyd's approved managing agents. Managing agents receive fees and profit commissions in respect of the underwriting and administrative services they provide to the syndicates. Lloyd's prescribes, in respect of its managing agents and Members, certain minimum standards relating to their management and control, solvency and various other requirements. The Company participates in the Lloyd's market through the 100% ownership of SiriusPoint Corporate Member Ltd., a Lloyd's corporate member, which in turn provides underwriting stamp capacity to Syndicate 1945. The Company has its own Lloyd's managing agent, SiriusPoint International Managing Agency, which manages Syndicate 1945. Lloyd's approved net capacity for 2022 was £89.0 million, or approximately $107.5 million (ba sed on the December 31, 2022 GBP to USD exchange rate). Stamp capacity is a measure of the amount of net premium (premiums written less acquisition costs) that a syndicate is authorized by Lloyd's to write. SiriusPoint International is subject to regulation and supervision by the Swedish Financial Supervisory Authority ("SFSA"). Under Solvency II, the SFSA also acts as the European Economic Area group supervisor, with Sirius Group International S.a.r.l. ("SGI") s erving as the highest European entity subject to the SFSA's group supervision. Solvency II regulation in Europe gives the SFSA the option to waive European-level group supervision if certain legal requirements are met. As of December 31, 2022, the SFSA has not exercised this option. For the year ended December 31, 2022, SiriusPoint International’s statutory net income (loss) was $(69.6) million (2021 - $289.5 million) . The Company is currently completing its statutory returns for SiriusPoint International and SGI for the year ended December 31, 2022, which must be filed with the SFSA on or before April 8, 2023 and May 20, 2023, respectively, and at this time, the Company believes it will exceed the target level of required capital and surplus. SiriusPoint International has the ability to pay dividends to its immediate parent subject to the availability of unrestricted equity, calculated in accordance with the Swedish Act on Annual Accounts in Insurance Companies and the SFSA. Unrestricted equity is calculated on a consolidated group account basis and on a parent account basis. Differences between the two include but are not limited to accounting for goodwill, subsidiaries (with parent accounts stated at original foreign exchange rates), taxes and pensions. SiriusPoint International's ability to pay dividends is limited to the "lower of" unrestricted equity as calculated within the group and parent accounts. As of December 31, 2022, SiriusPoint International had $437.4 million (based on the December 31, 2022 SEK to USD exchange rate) of unrestricted equity on a stand alone basis (the lower of the two approaches) available to pay dividends in 2022 (2021 - $560.3 million). The amount of dividends available to be paid by SiriusPoint International in any given year is also subject to cash flow and earnings generated by SiriusPoint International's business, the maintenance of adequate solvency capital ratios for SiriusPoint International and the consolidated SGI group, as well as to dividends received from its subsidiaries. Earnings generated by SiriusPoint International's business that are allocated to the Safety Reserve are not available to pay dividends (see "Safety Reserve" below). During 2022, SiriusPoint International did not declare a dividend and paid SEK 25.1 million (or $2.3 million on date of payment) of dividends declared prior to 2022. U.S. SiriusPoint America, SiriusPoint Specialty Insurance Corporation (“SiriusPoint Specialty”) and Oakwood Insurance Company (“Oakwood”) are subject to regulation and supervision by the National Association of Insurance Commissioners ("NAIC") and the department of insurance in the state of domicile. The NAIC uses risk-based capital ("RBC") standards for U.S. property and casualty insurers as a means of monitoring certain aspects affecting the overall financial condition of insurance companies. As of December 31, 2022, the NAIC risk-based capital authorized control level for SiriusPoint America, SiriusPoint Specialty, and Oak wood was $152.2 million , $9.2 million and $0.3 million , respe ctively, and the subsidiaries’ available capital exceeded their respective RBC requirements. The following is a summary of estimated actual and required statutory capital and surplus of the U.S. based insurance and reinsurance subsidiaries as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Actual statutory capital and surplus SiriusPoint America $ 508.8 $ 581.5 SiriusPoint Specialty 57.0 55.2 Oakwood 39.4 39.7 Required statutory capital and surplus (1) SiriusPoint America 152.2 112.4 SiriusPoint Specialty 46.0 47.0 Oakwood $ 7.5 $ 7.5 (1) Equals the authorized control level of the NAIC risk-based capital. The following is a summary of the statutory net income (loss) for the U.S. based insurance and reinsurance subsidiaries for the years ended December 31, 2022 and 2021: 2022 2021 SiriusPoint America $ (56.2) $ 28.9 SiriusPoint Specialty (8.1) (7.1) Oakwood $ (0.2) $ (0.4) The principal differences between the statutory amounts and the amounts reported in accordance with GAAP include deferred acquisition costs, deferred taxes, gains recognized under retroactive reinsurance contracts and market value adjustments for debt securities. Under the normal course of business, SiriusPoint America has the ability to pay dividends to its immediate parent during any twelve-month period without the prior approval of regulatory authorities in an amount set by a formula based on the lesser of net investment income, as defined by statute, or 10% of statutory surplus, in both cases as most recently reported to regulatory authorities, subject to the availability of earned surplus and subject to dividends paid in prior periods. Based on this formula, SiriusPoint America has dividend capacity as of December 31, 2022, without prior regulatory approval. As of December 31, 2022, SiriusPoint America ha d approximately $508.8 million ( 2021 - $581.5 million) of statutory surplus and $9.9 million ( 2021 - $69.0 million) of earned s urplus, and could pay approximately $9.9 million ( 2021 - $11.0 million) to its parent company. During 2022, SiriusPoint America did not pay a dividend to its immediate parent. Safety Reserve Subject to certain limitations under Swedish law, SiriusPoint International is permitted to transfer pre-tax income amounts into a reserve referred to as a "Safety Reserve." Under local statutory requirements, an amount equal to the deferred tax liability on SiriusPoint International's Safety Reserve is included in Solvency Capital. Access to the Safety Reserve is generally restricted to cover insurance and reinsurance losses and to cover a breach of the Solvency Capital Requirement. Similar to the approach taken by Swedish regulatory authorities, most major rating agencies generally take into account the Safety Reserve in SiriusPoint International's regulatory capital when assessing SiriusPoint International and SiriusPoint's financial strength. As of December 31, 2022, SiriusPoint International's Safety Reserve was SEK 6.0 billion, or $0.6 billion (based on the December 31, 2022 SEK to USD exchange rate). Under Swedish GAAP, an amount equal to the Safety Reserve, net of a related deferred tax liability established at the Swedish tax rate, is classified as common shareholders' equity. Generally, this deferred tax liability ($118.9 million based on the December 31, 2022 SEK to USD exchange rate) is required to be paid by SiriusPoint International if it fails to maintain prescribed levels of premium writings and loss reserves in future years. As a result of the indefinite deferral of these taxes, the related deferred tax liability is not taken into account by Swedish regulatory authorities for purposes of calculating Solvency Capital under Swedish insurance regulations.

Schedule I - Summary of investm

Schedule I - Summary of investments - Other Than Investments in Related Parties	12 Months Ended
	Dec. 31, 2022
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract]
Schedule I - Summary of investments - Other Than Investments in Related Parties	Schedule I - Summary of Investments - Other than Investments in Related Parties As of December 31, 2022 (expressed in millions of U.S. dollars) Cost or amortized cost Fair value Balance sheet value Assets Asset-backed securities $ 234.1 $ 230.7 $ 230.7 Residential mortgage-backed securities 354.3 340.7 340.7 Commercial mortgage-backed securities 62.1 61.2 61.2 Bank debt — — — Corporate debt securities 428.5 415.7 415.7 U.S. government and government agency 1,561.9 1,550.6 1,550.6 Non-U.S. government and government agency 37.2 36.6 36.6 Total debt securities, available for sale 2,678.1 2,635.5 2,635.5 Asset-backed securities 575.5 553.7 553.7 Residential mortgage-backed securities 155.9 133.6 133.6 Commercial mortgage-backed securities 130.5 113.4 113.4 Corporate debt securities 391.4 363.5 363.5 U.S. government and government agency 278.6 270.4 270.4 Non-U.S. government and government agency 95.8 88.2 88.2 Preferred stocks 2.4 3.2 3.2 Total debt securities, trading 1,630.1 1,526.0 1,526.0 Total short-term investments 984.5 984.6 984.6 Total equity securities 1.8 1.6 1.6 Total other long-term investments 159.0 176.0 176.0 Total investments in securities $ 5,453.5 $ 5,323.7 $ 5,323.7

Schedule II - Condensed Financi

Schedule II - Condensed Financial Information of Registrant	12 Months Ended
	Dec. 31, 2022
Condensed Financial Information Disclosure [Abstract]
Schedule II - Condensed Financial Information of Registrant	Schedule II - Condensed Financial Information of Registrant (1) Balance Sheets As of December 31, 2022 and 2021 (expressed in millions of U.S. dollars) December 31, 2022 December 31, 2021 Assets Total investments $ 19.4 $ 13.0 Cash and cash equivalents 5.6 7.9 Investment in subsidiaries 2,875.9 3,405.6 Amounts due from affiliates 14.7 — Other assets 12.8 12.7 Total assets $ 2,928.4 $ 3,439.2 Liabilities Accounts payable, accrued expenses and other liabilities $ 15.3 $ 17.4 Amounts due to affiliates — 13.6 Liability-classified capital instruments 60.4 87.8 Debt 778.0 816.7 Total liabilities 853.7 935.5 Shareholders’ equity Series B preference shares 200.0 200.0 Common shares 16.2 16.2 Additional paid-in capital 1,641.3 1,622.7 Retained earnings 262.2 665.0 Accumulated other comprehensive loss (45.0) (0.2) Total shareholders’ equity 2,074.7 2,503.7 Total liabilities and shareholders’ equity $ 2,928.4 $ 3,439.2 (1) The condensed financial information should be read in conjunction with the consolidated financial statements and notes thereto. Schedule II - Condensed Financial Information of Registrant (1) Statements of Income For the years ended December 31, 2022, 2021 and 2020 2022 2021 2020 Revenues Total realized and unrealized investment gains and net investment income $ 6.4 $ 1.3 $ — Other revenues 30.6 100.2 — Equity in earnings (losses) of subsidiaries (360.2) 90.1 169.9 Total revenues (323.2) 191.6 169.9 Expenses Net corporate and other expenses 64.9 109.5 26.4 Interest expense 38.6 34.0 — Foreign exchange gains (38.1) (18.2) — Total expenses 65.4 125.3 26.4 Income (loss) before income tax (expense) benefit (388.6) 66.3 143.5 Income tax (expense) benefit 1.8 (8.2) — Net income (loss) available to SiriusPoint (386.8) 58.1 143.5 Dividends on Series B preference shares (16.0) (13.5) — Net income (loss) available to SiriusPoint common shareholders $ (402.8) $ 44.6 $ 143.5 (1) The condensed financial information should be read in conjunction with the consolidated financial statements and notes thereto. Schedule II - Condensed Financial Information of Registrant (1) Statements of Income For the years ended December 31, 2022, 2021 and 2020 2022 2021 2020 Comprehensive income (loss) Net income (loss) available to SiriusPoint $ (386.8) $ 58.1 $ 143.5 Other comprehensive loss Change in foreign currency translation, net of tax (5.0) (0.2) — Unrealized gains (losses) from debt securities held as available for sale investments (42.5) — — Reclassifications from accumulated other comprehensive income 2.7 — — Total other comprehensive loss (44.8) (0.2) — Comprehensive income (loss) available to SiriusPoint $ (431.6) $ 57.9 $ 143.5 (1) The condensed financial information should be read in conjunction with the consolidated financial statements and notes thereto. Schedule II - Condensed Financial Information of Registrant (1) Statements of Cash Flow For the years ended December 31, 2022, 2021 and 2020 2022 2021 2020 Operating activities Net income (loss) available to SiriusPoint $ (386.8) $ 58.1 $ 143.5 Adjustments to reconcile net income available to SiriusPoint to net cash provided by operating activities: Equity in (earnings) losses of subsidiaries 360.2 (90.1) (169.9) Dividend received by parent 125.0 74.0 135.2 Share compensation expense 30.6 11.7 0.7 Net realized and unrealized gain on investments and derivatives (6.4) (1.3) — Amortization of premium and accretion of discount, net (0.5) (0.7) — Other revenues (27.4) (100.1) — Other items, net (38.0) (25.4) — Changes in assets and liabilities: Other assets (0.1) 0.8 (4.2) Accounts payable, accrued expenses and other liabilities (2.5) 15.8 (2.4) Amounts due from (to) affiliates (28.3) 86.1 (102.3) Net cash provided by operating activities 25.8 28.9 0.6 Investing activities Purchases of investments — (11.8) — Proceeds from sales and maturities of investments — 4.1 — Acquisition of Sirius Group — (51.6) — Net cash used in investing activities — (59.3) — Financing activities Proceeds from issuance of SiriusPoint common shares, net of costs — 50.8 — Taxes paid on withholding shares (7.1) (0.5) (0.4) Purchases of SiriusPoint common shares under share repurchase program (5.0) — — Cash dividends paid to preference shareholders (16.0) (12.2) — Net cash provided by (used in) financing activities (28.1) 38.1 (0.4) Net increase (decrease) in cash, cash equivalents and restricted cash (2.3) 7.7 0.2 Cash, cash equivalents and restricted cash at beginning of year 7.9 0.2 — Cash, cash equivalents and restricted cash at end of year $ 5.6 $ 7.9 $ 0.2 (1) The condensed financial information should be read in conjunction with the consolidated financial statements and notes thereto.

Schedule III - Supplementary In

Schedule III - Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2022
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]
Schedule III - Supplementary Insurance Information	Schedule III - Su pplementary Insurance Information As of and f or the year s ended December 31, 2022, 2021 and 2020 (expressed in millions of U.S. dollars) As of and for the year ended December 31, 2022 Deferred acquisition costs and value of business acquired, net Loss and loss adjustment expense reserves Unearned premium Net premiums earned Total realized and unrealized investment gains (losses) and net investment income Loss and loss adjustment expenses incurred, net Acquisition costs, net Other underwriting expenses Net premiums written Reinsurance $ 175.7 $ 3,512.2 $ 843.9 $ 1,213.1 $ (3.9) $ 855.9 $ 310.3 $ 113.8 $ 1,199.6 Insurance & Services 119.1 1,068.5 676.8 1,086.8 (2.2) 718.7 273.2 62.8 1,346.0 Corporate & Eliminations (1) 0.1 688.0 0.4 18.2 (316.6) 13.8 (121.6) 7.9 3.6 $ 294.9 $ 5,268.7 $ 1,521.1 $ 2,318.1 $ (322.7) $ 1,588.4 $ 461.9 $ 184.5 $ 2,549.2 As of and for the year ended December 31, 2021 Deferred acquisition costs and value of business acquired, net Loss and loss adjustment expense reserves Unearned premium Net premiums earned Total realized and unrealized investment gains (losses) and net investment income Loss and loss adjustment expenses incurred, net Acquisition costs, net Other underwriting expenses Net premiums written Reinsurance $ 147.5 $ 3,435.7 $ 687.5 $ 1,210.9 $ 0.3 $ 999.6 $ 302.7 $ 105.5 $ 1,124.9 Insurance & Services 71.2 511.1 498.4 522.8 (4.8) 320.6 149.7 29.2 652.8 Corporate & Eliminations (1) 0.1 894.6 12.5 (16.7) 317.0 6.3 (64.6) 24.1 (43.5) $ 218.8 $ 4,841.4 $ 1,198.4 $ 1,717.0 $ 312.5 $ 1,326.5 $ 387.8 $ 158.8 $ 1,734.2 As of and for the year ended December 31, 2020 Deferred acquisition costs and value of business acquired, net Loss and loss adjustment expense reserves Unearned premium Net premiums earned Total realized and unrealized investment gains and net investment income Loss and loss adjustment expenses incurred, net Acquisition costs, net Other underwriting expenses Net premiums written Reinsurance $ 69.5 $ 1,084.1 $ 261.9 $ 575.6 $ — $ 459.5 $ 160.4 $ 24.0 $ 497.3 Insurance & Services (0.9) 6.3 19.5 7.1 — 5.9 1.4 0.2 16.0 Corporate & Eliminations (1) — 219.7 3.4 28.1 278.9 (0.1) 25.3 5.9 28.9 $ 68.6 $ 1,310.1 $ 284.8 $ 610.8 $ 278.9 $ 465.3 $ 187.1 $ 30.1 $ 542.2 (1) Corporate & Eliminations includes the results of all runoff business and non-underwriting income and expenses.

Schedule IV - Reinsurance

Schedule IV - Reinsurance	12 Months Ended
	Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]
Schedule IV - Reinsurance	Schedule IV - Reinsurance For the years ended December 31, 2022, 2021 and 2020 (expressed in millions of U.S. dollars) Direct premiums written Ceded to other companies Assumed from other companies Net amount Percentage of amount assumed to net Year ended December 31, 2022 $ 1,403.9 $ 860.5 $ 2,005.8 $ 2,549.2 78.7 % Year ended December 31, 2021 $ 718.0 $ 502.3 $ 1,518.5 $ 1,734.2 87.6 % Year ended December 31, 2020 $ 19.0 $ 46.3 $ 569.5 $ 542.2 105.0 %

Schedule VI - Supplementary Inf

Schedule VI - Supplementary Information for Property-Casualty Insurance Operations	12 Months Ended
	Dec. 31, 2022
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]
Schedule VI - Supplementary Information for Property-Casualty Insurance Operations	Schedule VI - Supplementary Information for Property-Casualty Insurance Operations As of and for the years ended December 31, 2022, 2021 and 2020 (expressed in millions of U.S. dollars) Deferred acquisition costs and value of business acquired, net Loss and Unearned premium reserves Net premiums earned Total realized and unrealized investment gains (losses) and net investment income Loss and Loss and loss Acquisition costs, net Net paid losses Net 2022 $ 294.9 $ 5,268.7 $ 1,521.1 $ 2,318.1 $ (322.7) $ 1,609.7 $ (21.3) $ 461.9 $ 1,255.3 $ 2,549.2 2021 218.8 4,841.4 1,198.4 1,717.0 312.5 1,369.1 (42.6) 387.8 1,450.1 1,734.2 2020 $ 68.6 $ 1,310.1 $ 284.8 $ 610.8 $ 278.9 $ 431.5 $ 33.8 $ 187.1 $ 283.1 $ 542.2

Significant accounting polici_2

Significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Use of estimates	The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported and disclosed amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The major estimates reflected in the Company’s consolidated financial statements include, but are not limited to, the loss and loss adjustment expense reserves, estimates of written and earned premiums and fair value of financial instruments.
Business combinations	The Company accounts for business combinations in accordance with Accounting Standards Codification ("ASC") Topic 805 Business Combinations , and intangible assets that arise from business combinations in accordance with ASC Topic 350 Intangibles – Goodwill and Other . The difference between the fair value of net assets acquired and the purchase price is recorded as a bargain purchase gain in other revenues in the consolidated statements of income (loss).
Intangible assets	Intangible assets arising from our business acquisitions are classified as either finite or indefinite-lived intangible assets. Finite-lived intangible assets are amortized over their useful lives with the amortization expense being recognized in the consolidated statements of income (loss). The amortization periods approximate the period over which the Company expects to generate future net cash inflows from the use of these assets. All of these assets are subject to impairment testing for the impairment or disposal of long-lived assets when events or conditions indicate that the carrying value of an asset may not be fully recoverable from future cash flows. Indefinite-lived intangible assets are however not subject to amortization. The carrying values of intangible assets are reviewed for indicators of impairment at least annually. The Company initially evaluates indefinite-lived intangible assets using a qualitative approach to determine whether it is more likely than not that the fair value is greater than its carrying value. If the results of the qualitative evaluation indicate that it is more likely than not that the carrying value exceeds its fair value, the Company performs the quantitative test for impairment. If indefinite-lived intangible assets are impaired, such assets are written down to their fair values with the related expense recognized in the consolidated statements of income (loss).
Cash, cash equivalents and restricted cash	Cash and cash equivalents consist of cash held in banks and other short-term, highly liquid investments with original maturity dates of ninety days or less. Restricted cash and cash equivalents consist of cash held in trust accounts securing obligations under certain reinsurance contracts and cash held in trust accounts securing letters of credit issued under credit facilities.
Premium revenue recognition	Effective January 1, 2021, the Company changed its accounting policy for assumed written premiums. Previously, the Company estimated ultimate premium written for the entire contract period and recorded this estimate at inception of the contract. For contracts where the full premium written was not estimable at inception, the Company recorded premium written for the portion of the contract period for which the amount was estimable. The Company changed its accounting policy to recognize premiums written ratably over the term of the related policy or reinsurance treaty consistent with the timing of when the ceding company has recognized the written premiums. Premiums written include amounts reported by brokers and ceding companies, supplemented by the Company's own estimates of premiums where reports have not been received. The determination of premium estimates requires a review of the Company's experience with the ceding companies, managing general underwriters, familiarity with each market, the timing of the reported information, an analysis and understanding of the characteristics of each class of business and management's judgment of the impact of various factors, including premium or loss trends, on the volume of business written and ceded to the Company. On an ongoing basis, the Company's underwriters review the amounts reported by these third parties for reasonableness based on their experience and knowledge of the subject class of business, taking into account the Company's historical experience with the brokers or ceding companies. Changes in premium estimates are expected and may result in adjustments in any reporting period. Any subsequent adjustments arising on such estimates are recorded in the period in which they are determined.
Reinsurance premiums ceded, Funds held and Reinsurance	The Company reduces the risk of losses on business written by reinsuring certain risks and exposures with other reinsurers. The Company remains liable to the extent that any retrocessionaire fails to meet its obligations and to the extent that the Company does not hold sufficient security for their unpaid obligations. Ceded premiums are written during the period in which the risks incept and are earned over the contract period in proportion to the period of risk covered. Unearned premiums ceded consist of the unexpired portion of insurance and reinsurance ceded. Funds held by ceding companies represent amounts due to the Company in connection with certain assumed reinsurance agreements in which the ceding company retains a portion of the premium to provide security against future loss payments. The funds held by ceding companies are generally invested by the ceding company and a contractually agreed interest amount is credited to the Company and recognized as investment income. These amounts are included in insurance and reinsurance balances receivable, net on the consolidated balance sheets. Funds held under reinsurance treaties represent contractual payments due from the Company that have been retained to secure such obligations. These amounts are included in reinsurance balances payable on the consolidated balance sheets.
Deferred acquisition costs	Deferred acquisition costs consist of commissions, brokerage expenses, excise taxes and other costs which are directly attributable to the successful acquisition or renewal of contracts and vary with the production of business. These costs are deferred and amortized over the period in which the related premiums are earned. Amortization of deferred acquisition costs are shown net of contractual commissions earned on reinsurance ceded within acquisition expenses, net in the consolidated statements of net income (loss). Acquisition costs also include profit commissions which are calculated and accrued based on the expected loss experience for contracts and recorded when the current loss estimate indicates that a profit commission is probable under the contract terms.
Value of business acquired ("VOBA")	As a result of the Sirius Group acquisition, a value of business acquired (“VOBA”) intangible asset was established. VOBA represents the expected future losses and expenses associated with the policies and contracts that were in-force as of the closing date of the transaction compared to the future premium remaining expected to be earned. The difference between the risk-adjusted future loss and expenses, discounted to present value, and the unearned premium reserve was estimated to be the VOBA. Amortization of VOBA is recorded in acquisition costs, net in the consolidated statements of net income (loss) and the VOBA related asset is included in deferred acquisition costs and value of business acquired, net on the consolidated balance sheets. As of December 31, 2022, VOBA was fully amortized and therefore had no carrying value.
Loss and loss adjustment expense reserves	The Company’s loss and loss adjustment expense reserves include case reserves, reserves for losses incurred but not yet reported (“IBNR reserves”) and deferred gains on retroactive reinsurance contracts. Case reserves are established for losses that have been reported, but not yet paid. IBNR reserves represent the estimated loss and loss adjustment expenses that have been incurred by insureds and reinsureds but not yet reported to the insurer or reinsurer, including unknown future development on loss and loss adjustment expenses that are known to the insurer or reinsurer. IBNR reserves are established by management based on actuarially determined estimates of ultimate loss and loss adjustment expenses. Inherent in the estimate of ultimate loss and loss adjustment expenses are expected trends in claim severity and frequency and other factors that may vary significantly as claims are settled. Accordingly, ultimate loss and loss adjustment expenses may differ materially from the amounts recorded in the consolidated financial statements. These estimates are reviewed regularly and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments, if any, are recorded in the consolidated statements of income (loss) in the period in which they become known.
Deposit liabilities	Certain contracts do not transfer sufficient insurance risk to be deemed reinsurance contracts and are accounted for using the deposit method of accounting. Management exercises judgment in determining whether contracts transfer sufficient risk to be accounted for as reinsurance contracts. Using the deposit method of accounting, a deposit liability, rather than written premium, is initially recorded based upon the consideration received less any explicitly identified premiums or fees. In subsequent periods, the deposit liability is adjusted by calculating the effective yield on the deposit to reflect actual payments to date and future expected payments. In some cases, the effective yield on the contract may be negative, which will result in the recognition of other income. Fixed interest credits on deposit accounted contracts are included in net corporate and other expenses in the consolidated statements of net income (loss)
Fair value measurement	The Company determines the fair value of financial instruments in accordance with current accounting guidance, which defines fair value and establishes a three level fair value hierarchy based upon the transparency of inputs used in the valuation of an asset or liability. Fair value is defined as the price that the Company would receive to sell an asset or would pay to transfer a liability in an orderly transaction between market participants at the measurement date. The Company determines the estimated fair value of each individual security utilizing the highest level inputs available.
Investments	Short-term investments Short-term investments consist of U.S. treasury bills, certificates of deposit and other securities, which, at the time of purchase, mature within a period of greater than three months but less than one year. Short-term investments are classified as trading securities, carried at fair value and disclosed as a separate line item in the consolidated balance sheets. Debt Securities The Company’s investments are classified as either trading securities or available for sale (“AFS”). Trading securities are carried at fair value with changes in fair value included in earnings in the consolidated statements of income (loss). AFS securities are held at fair value, net of an allowance for credit losses, and any decline in fair value that is believed to arise from factors other than credit is recorded as a separate component of accumulated other comprehensive income (loss) in the consolidated statement of shareholders’ equity. The Company has elected to classify debt securities, other than short-term investments, purchased on or after April 1, 2022 as AFS. The fair value of the Company’s investments are based on quoted market prices, or when such prices are not available, by reference to broker or underwriter bid indications, industry recognized pricing vendors, and/or internal pricing valuation techniques. Investment transactions are recorded on a trade date basis with balances pending settlement included in due to/from brokers in the consolidated balance sheets. Realized gains and losses are determined using cost calculated on a specific identification basis and are reported pre-tax in revenues. Dividends are recorded on the ex-dividend date. Income and expenses are recorded on the accrual basis including interest and premiums amortized and discounts accreted. Other long-term investments Other long-term investments consist primarily of hedge funds, private equity funds, and strategic investments. The fair values of hedge funds and private equity funds that produce net asset value (“NAV”) are generally recorded based upon the Company's proportionate interest in the underlying fund's NAV, which is deemed to approximate fair value or the equity method where applicable. In addition, due to a lag in reporting, some of the fund managers, fund administrators or both, are unable to provide final fund valuations as of the Company's reporting date. In these circumstances and where the fair value option is elected, the Company uses all credible information available to estimate fair value. This includes utilizing preliminary estimates reported by its fund managers and using information that is available to the Company with respect to the underlying investments, as necessary. The changes in fair value are reported in pre-tax revenues in net realized and unrealized investment gains (losses). Actual final fund valuations may differ from the Company's estimates and these differences are recorded in the period they become known as a change in estimates. Other long-term investments include certain strategic investments that are carried at fair value, using the equity method or the cost adjusted for market observable events less impairment method. For strategic investments carried at fair value, management uses commonly accepted valuation methods (i.e., income approach, market approach). Where appropriate to utilize equity method, the Company recognizes its share of the investees’ income in net realized and unrealized investment gains (losses). Where criteria to be accounted for under the equity method is not met, we have elected to value our strategic investments at the cost adjusted for market observable events less impairment method, a measurement alternative in which the investment is measured at cost and remeasured to fair value when determined to be impaired or upon observable transactions prices becoming available. See Note 9 for additional information. Investments in related party investment funds The Company invests in Third Point Enhanced LP (“ TP Enhanced Fund ”), Third Point Venture Offshore Fund I LP (“TP Venture Fund”) and Third Point Venture Offshore Fund II LP (“ TP Venture Fund II ”) (collectively, the “Related Party Investment Funds”), which are related party investment funds. The Company’s investments in the funds are stated at their fair value, that generally represents the Company’s proportionate interest in the funds as reported by the fund based on the NAV provided by the fund administrator. Increases or decreases in such fair value are recorded within net realized and unrealized investment gains (losses) from related party investment funds in the Company’s consolidated statements of income (loss). The Company records contributions and withdrawals related to its investments in the funds on the transaction date.
Derivative financial instruments	The Company holds derivative contracts to manage credit risk, interest rate risk, currency exchange risk and other exposure risks. The Company uses derivatives in connection with its risk-management activities to economically hedge certain risks and to gain exposure to certain investments. The utilization of derivative contracts also allows for an efficient means by which to trade certain asset classes. Fair values of derivatives are determined by using quoted market prices, industry recognized pricing vendors and counterparty quotes when available; otherwise fair values were based on pricing models that consider the time value of money, volatility and the current market and contractual prices of underlying financial instruments.
Share-based compensation	The Company accounts for its share-based compensation transactions using the fair value of the award at the grant date and accounts for forfeitures when they occur. Determining the fair value of share purchase options at the grant date requires estimation and judgment. The Company uses an option-pricing model (Black-Scholes) to calculate the fair value of share purchase options and used a simplified method to develop the estimate of expected term, where appropriate. For share-based compensation awards that contain both a service and performance condition, the Company recognizes compensation expense only for the portion of the award that is considered probable of vesting. Fair value of share-based compensation awards considered probable of vesting are expensed over the requisite service period. The probability of share-based awards vesting is evaluated at each reporting period. Share-based compensation awards that contain only service condition and share purchase options are expensed ratably over the requisite service period.
Defined benefit plans	Certain SiriusPoint employees in Europe participate in defined benefit plans. The liability for the defined benefit plans that is reported on the consolidated balance sheets is the current value of the defined benefit obligation at the end of the period, reduced by the fair value of the plan's assets, with adjustments for actuarial gains and losses. The defined benefit pension plan obligation is calculated annually by independent actuaries. The current value of the defined benefit obligation is determined through discounting of expected future cash flows, using interest rates determined by current market interest rates. The service costs and actuarial gains and losses on the defined benefit obligation and the fair value on the plan assets are recognized in the consolidated statements of income (loss).
Debt offering costs	Costs incurred in issuing debt, which includes underwriters’ fees, legal and accounting fees, printing and other fees are capitalized and presented as a direct deduction from the principal amount of notes payable in the consolidated balance sheets. These costs are amortized over the term of the debt and are included in interest expense in the consolidated statements of income (loss).
Other underwriting expenses	Other underwriting expenses primarily consist of general and administrative expenses and other operating income and expenses associated with underwriting activities. Other underwriting expenses are also comprised of expenses relating to interest crediting features in certain reinsurance contracts and changes in fair value of reinsurance contracts accounted for as derivatives. Variable and fixed interest crediting features are calculated on funds transferred to the Company where interest is credited based on actual cash received into a notional experience account. The ceding company can typically elect to commute at specific points in time in exchange for the amounts held in the notional experience account. For those contracts that contain variable interest crediting features, actual investment returns realized by the Company are included in the calculation, which can increase the overall effective interest crediting rate on those contracts. Variable interest credit features are accounted for as embedded derivatives. Fixed interest credits on reinsurance contracts are included in other underwriting expenses in the consolidated statements of income (loss).
Net corporate and other expenses	Net corporate and other expenses include services expenses, costs associated with operating as a publicly-traded company, non-underwriting activities, including service fee expenses from our MGA subsidiaries, and current expected credit losses (“CECL”) from our insurance and reinsurance balances receivable and loss and loss adjustment expenses recoverable and severance charges.
Foreign currency exchange	The U.S. dollar is the functional curre ncy for the Company’s businesses except for the Canadian reinsurance operations of SiriusPoint America Insurance Company. T he Company invests in securities denominated in foreign currencies. Assets and liabilities recorded in these foreign currencies are translated into U.S. dollars at exchange rates in effect at the balance sheet date, and revenues and expenses are translated using the average exchange rates for the period. Net foreign exchange gains and losses arising from the translation of functional currencies are reported in shareholders’ equity, in accumulated other comprehensive loss. As of December 31, 2022, the Company had net unrealized foreign currency translation losses of $5.0 million recorded in accumulated other comprehensive loss on its consolidated balance sheet. For non functional currencies, the resulting exchange gains and losses are reported as a component of net income (loss) in the period in which they arise within net realized and unrealized investment gains (losses) and net foreign exchange gains (losses).
Federal and foreign income taxes	The Company provides for income taxes for its operations in income tax paying jurisdictions. The Company’s provision relies on estimates and interpretations of currently enacted tax laws. The Company recognizes deferred tax assets and liabilities based on the temporary differences between the financial statement carrying amounts and the tax bases of assets and liabilities. A valuation allowance against deferred tax assets is recorded if it is more likely than not that all, or some portion, of the benefits related to deferred tax assets will not be realized. Any adjustments to deferred income taxes are accounted for as changes in estimates and are reflected in the consolidated statements of income (loss) in the year in which they are made. Adjustments could be material and could significantly impact earnings in the year they are recorded.
Variable and voting interest entities	We evaluate our investments to determine whether those investments are variable interest entities ("VIEs") or voting interest entities (“VOEs”) and whether consolidation is required. The Company consolidates the results of operations and financial position of all VOEs in which it has a controlling financial interest and VIEs in which it is considered to be the primary beneficiary. The consolidation assessment, including the determination as to whether an entity qualifies as a VOE or VIE, depends on the facts and circumstances surrounding each entity. VIE is a legal entity that does not have sufficient equity at risk to finance its activities without additional subordinated financial support or is structured such that equity investors lack the ability to make significant decisions relating to the entity’s operations through voting rights or do not substantively participate in the gains and losses of the entity. Consolidation of a VIE by its primary beneficiary is not based on majority voting interest, but is based on other criteria discussed below.
Noncontrolling interests	The Company consolidates the results of entities in which it has a controlling financial interest. Noncontrolling interests are presented as a separate line within shareholders’ equity in the consolidated balance sheets. The Company records the portion of net (income) loss attributable to noncontrolling interests as a separate line within the consolidated statements of income (loss).
Earnings per share	Basic earnings per share is based on the weighted average number of common shares and participating securities outstanding during the period. The weighted average number of common shares excludes any dilutive effect of outstanding warrants, options and unvested restricted shares. Diluted earnings per share is based on the weighted average number of common shares and participating securities outstanding and includes any dilutive effects of warrants, options and unvested restricted shares under share plans and are determined using the treasury stock method. U.S. GAAP requires that unvested share awards that contain non-forfeitable rights to dividends or dividend equivalents, whether paid or unpaid (referred to as “participating securities”), be treated in the same manner as outstanding shares for earnings per share calculations. The Company treats certain of its unvested restricted shares as participating securities. In the event of a net loss, all participating securities, outstanding warrants, options and restricted shares are excluded from both basic and diluted loss per share since their inclusion would be anti-dilutive.
Leases	Leases in which substantially all of the risks and rewards of ownership are retained by the lessor are classified as operating leases. The Company does not have any leases classified as finance leases. For its operating leases, the Company recognizes lease assets and liabilities on the balance sheet, with the exception of leases with an original term of 12 months or less. Lease assets and liabilities are initially recognized and measured based on the present value of the lease payments.
Segment information	Under U.S. GAAP, operating segments are based on the internal information that management uses for allocating resources and assessing performance of the Company. The Company manages its business on the basis of two operating segments: Reinsurance and Insurance & Services.
Liability-classified capital instruments	As part of the consideration transferred in the acquisition of Sirius Group, the Company issued various instruments that were classified as liabilities based on their terms, notably the settlement features for each and any potential adjustments to the exercise price for the warrants issued. Liability-classified capital instruments reported in the consolidated balance sheets include Series A preference shares, Merger Warrants, Private Warrants, Sirius Group Public Warrants, Upside Rights and Contingent Value Rights. See Note 3 for additional information on each of these instruments. The liability-classified capital instruments are carried at fair value with changes in fair value included in other revenues in the consolidated statements of income (loss).
Recent accounting pronouncements	Recently Issued Accounting Standards Not Yet Adopted In June 2022, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions (“ASU 2022-03”). The amendment clarifies the guidance in Topic 820 on the fair value measurement of an equity security that is subject to a contractual sale restriction and requires specific disclosures related to such an equity security. ASU 2022-03 is effective for public business entities for fiscal years beginning after December 15, 2023 and interim periods within those fiscal years. This new pronouncement is not expected to have a material impact on the Company’s consolidated financial statements.

Significant accounting polici_3

Significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Schedule of the retrospective impact from the change in accounting policy	The following tables provide a summary of the retrospective impact from the change in accounting policy on the Company’s consolidated financial statements: Consolidated statement of income Year ended December 31, 2020 As previously reported Adjustment As adjusted Gross premiums written $ 588.0 $ 0.5 $ 588.5 Gross premiums ceded (39.7) (6.6) (46.3) Net premiums written 548.3 (6.1) 542.2 Change in net unearned premium reserves 62.5 6.1 68.6 Net premiums earned $ 610.8 $ — $ 610.8 Net income available to SiriusPoint common shareholders $ 143.5 $ — $ 143.5 Consolidated statement of cash flow Year ended December 31, 2020 As previously reported Adjustment As adjusted Insurance and reinsurance balances receivable, net $ 38.8 $ (0.2) $ 38.6 Deferred acquisition costs and value of business acquired, net 20.4 3.2 23.6 Unearned premiums ceded (10.7) (6.6) (17.3) Unearned premium reserves (51.8) 0.5 (51.3) Reinsurance balances payable (1.3) 3.1 1.8 Net cash provided by operating activities $ 73.3 $ — $ 73.3

Acquisition of Sirius Group (Ta

Acquisition of Sirius Group (Tables)	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Schedule of the total purchase price	The components of the Company's total purchase price for Sirius Group at February 26, 2021 were as follows: Cash consideration Sirius Group shares acquired for cash $ 100.4 Common Shares Common Shares issued by SiriusPoint 58,331,196 SiriusPoint share price as of February 26, 2021 $ 10.21 595.6 Preference Shares Series A Preference Shares issued, at fair value 40.8 Series B Preference Shares issued, at fair value (1) 200.0 Warrants Merger warrants issued, at fair value 53.4 Private warrants issued, at fair value 7.3 Sirius Group Public Warrants, at fair value 2.6 Upside Rights Upside Rights issued, at fair value 6.5 Contingent value rights (CVRs) CVRs issued, at fair value 27.0 CVR waiver restricted shares 0.7 Other Fair value of the replaced Sirius Group equity awards attributable to pre-combination services 37.5 Transaction fee reimbursement 8.0 Total purchase price $ 1,079.8 (1) See Note 17 for additional information.
Schedule of estimated fair values of major classes of identifiable assets acquired and liabilities assumed	The following table summarizes the estimated fair values of major classes of identifiable assets acquired and liabilities assumed of Sirius Group as of February 26, 2021, the date the transaction closed: Identifiable net assets: Cash and investments $ 3,944.1 Insurance and reinsurance balances receivable, net 1,201.0 Reinsurance assets 649.7 Value of business acquired 147.9 Deferred tax asset 228.0 Intangible assets 178.8 Other assets 181.9 Loss and loss adjustment expense reserves (2,928.5) Unearned premium reserves (900.0) Deferred tax liability (186.8) Debt (728.2) Other liabilities (657.7) Total identifiable net assets acquired 1,130.2 Total purchase price 1,079.8 Bargain purchase gain $ 50.4
Schedule of identifiable intangible assets	Identifiable intangible assets consisted of the following and are included in intangible assets on the Company’s consolidated balance sheets as of December 31, 2022 and 2021 : Economic Useful Life Gross balance at February 26, 2021 Accumulated amortization Net balance at December 31, 2022 Distribution relationships 17 years $ 75.0 $ (1.9) $ 73.1 MGA relationships 13 years 34.0 (9.4) 24.6 Lloyd’s Capacity - Syndicate 1945 Indefinite 41.8 — 41.8 Insurance licenses Indefinite 7.0 — 7.0 Trade name 16 years 16.0 (0.8) 15.2 Internally developed computer software 5 years 5.0 (1.9) 3.1 Identifiable intangible assets $ 178.8 $ (14.0) 164.8 Insurance licenses sold (1.0) Net identifiable intangible assets at December 31, 2022 related to the acquisition of Sirius Group (1) $ 163.8 Economic Useful Life Gross balance at February 26, 2021 Accumulated amortization Net balance at December 31, 2021 Distribution relationships 17 years $ 75.0 $ — $ 75.0 MGA relationships 13 years 34.0 (4.9) 29.1 Lloyd’s Capacity - Syndicate 1945 Indefinite 41.8 — 41.8 Insurance licenses Indefinite 7.0 — 7.0 Trade name 16 years 16.0 (0.2) 15.8 Internally developed computer software 5 years 5.0 (0.8) 4.2 Identifiable intangible assets $ 178.8 $ (5.9) 172.9 Insurance licenses sold (1.0) Net identifiable intangible assets at December 31, 2021 related to the acquisition of Sirius Group (1) $ 171.9 (1) No impairments were recorded in the years ended December 31, 2022 and 2021.
Schedule of estimated remaining amortization expense for intangible assets with finite lives	The estimated remaining amortization expense for the Company's intangible assets with finite lives is as follows: 2023 $ 11.1 2024 12.0 2025 11.4 2026 9.9 2027 and thereafter 71.6 Total remaining amortization expense $ 116.0
Schedule of results of Sirius Group and pro forma financial information	The following table su mmarizes the results of Sirius Group that have been included in the Company's consolidated statements of income for the year ended December 31, 2021 : For the period from February 26, 2021 to December 31, 2021 Total revenues $ 1,224.3 Net loss $ (161.2) 2021 2020 Total revenues $ 2,343.9 $ 2,613.6 Net income (loss) $ 60.7 $ (268.4)

Segment reporting (Tables)

Segment reporting (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule of operating segment results	The following is a summary of the Company’s operating segment results for the years ended December 31, 2022, 2021 and 2020: 2022 Reinsurance Insurance & Services Core Eliminations (2) Corporate Segment Measure Reclass Total Gross premiums written $ 1,521.4 $ 1,884.2 $ 3,405.6 $ — $ 4.1 $ — $ 3,409.7 Net premiums written 1,199.6 1,346.0 2,545.6 — 3.6 — 2,549.2 Net premiums earned 1,213.1 1,086.8 2,299.9 — 18.2 — 2,318.1 Loss and loss adjustment expenses incurred, net 855.9 718.7 1,574.6 (5.2) 19.0 — 1,588.4 Acquisition costs, net 310.3 273.2 583.5 (118.6) (3.0) — 461.9 Other underwriting expenses 113.8 62.8 176.6 — 7.9 — 184.5 Underwriting income (loss) (66.9) 32.1 (34.8) 123.8 (5.7) — 83.3 Services revenue (0.2) 215.7 215.5 (133.4) — (82.1) — Services expenses — 179.2 179.2 — — (179.2) — Net services fee income (loss) (0.2) 36.5 36.3 (133.4) — 97.1 — Services noncontrolling loss — 1.1 1.1 — — (1.1) — Net investment losses from Strategic Investments (3.9) (2.2) (6.1) — — 6.1 — Net services income (loss) (4.1) 35.4 31.3 (133.4) — 102.1 — Segment income (loss) (71.0) 67.5 (3.5) (9.6) (5.7) 102.1 83.3 Net realized and unrealized investment losses (219.4) (6.1) (225.5) Net realized and unrealized investment losses from related party investment funds (210.5) — (210.5) Net investment income 113.3 — 113.3 Other revenues 28.1 82.1 110.2 Net corporate and other expenses (133.6) (179.2) (312.8) Intangible asset amortization (8.1) — (8.1) Interest expense (38.6) — (38.6) Foreign exchange gains 66.0 — 66.0 Income (loss) before income tax benefit $ (71.0) $ 67.5 (3.5) (9.6) (408.5) (1.1) (422.7) Income tax benefit — — 36.7 — 36.7 Net loss (3.5) (9.6) (371.8) (1.1) (386.0) Net income attributable to noncontrolling interests — — (1.9) 1.1 (0.8) Net loss attributable to SiriusPoint $ (3.5) $ (9.6) $ (373.7) $ — $ (386.8) Underwriting Ratios: (1) Loss ratio 70.6 % 66.1 % 68.5 % 68.5 % Acquisition cost ratio 25.6 % 25.1 % 25.4 % 19.9 % Other underwriting expenses ratio 9.4 % 5.8 % 7.7 % 8.0 % Combined ratio 105.6 % 97.0 % 101.6 % 96.4 % (1) Underwriting ratios are calculated by dividing the related expense by net premiums earned. (2) Insurance and Services MGAs recognize fees for service using revenue from contracts with customers accounting standards, whereas insurance companies recognize acquisition expenses using insurance contract accounting standards. While ultimate revenues and expenses recognized will match, there will be recognition timing differences based on the different accounting standards. 2021 Reinsurance Insurance & Services Core Eliminations (2) Corporate Segment Measure Reclass Total Gross premiums written $ 1,350.4 $ 897.9 $ 2,248.3 $ — $ (11.8) $ — $ 2,236.5 Net premiums written 1,124.9 652.8 1,777.7 — (43.5) — 1,734.2 Net premiums earned 1,210.9 522.8 1,733.7 — (16.7) — 1,717.0 Loss and loss adjustment expenses incurred, net 989.4 320.6 1,310.0 (2.6) 19.1 — 1,326.5 Acquisition costs, net 302.7 149.7 452.4 (67.6) 3.0 — 387.8 Other underwriting expenses 105.5 29.2 134.7 — 24.1 — 158.8 Underwriting income (loss) (186.7) 23.3 (163.4) 70.2 (62.9) — (156.1) Services revenue — 133.7 133.7 (82.6) — (51.1) — Services expenses — 120.5 120.5 — — (120.5) — Net services fee income — 13.2 13.2 (82.6) — 69.4 — Services noncontrolling loss — 2.3 2.3 — — (2.3) — Net investment gains (losses) from Strategic Investments 0.3 (4.8) (4.5) — — 4.5 — Net services income 0.3 10.7 11.0 (82.6) — 71.6 — Segment income (loss) (186.4) 34.0 (152.4) (12.4) (62.9) 71.6 (156.1) Net realized and unrealized investment losses (12.4) (4.5) (16.9) Net realized and unrealized investment gains from related party investment funds 304.0 — 304.0 Net investment income 25.4 — 25.4 Other revenues 100.1 51.1 151.2 Net corporate and other expenses (146.1) (120.5) (266.6) Intangible asset amortization (5.9) — (5.9) Interest expense (34.0) — (34.0) Foreign exchange gains 44.0 — 44.0 Income (loss) before income tax benefit $ (186.4) $ 34.0 (152.4) (12.4) 212.2 (2.3) 45.1 Income tax benefit — — 10.7 — 10.7 Net income (loss) (152.4) (12.4) 222.9 (2.3) 55.8 Net loss attributable to noncontrolling interests — — — 2.3 2.3 Net income (loss) available to SiriusPoint $ (152.4) $ (12.4) $ 222.9 $ — $ 58.1 Underwriting Ratios: (1) Loss ratio 81.7 % 61.3 % 75.6 % 77.3 % Acquisition cost ratio 25.0 % 28.6 % 26.1 % 22.6 % Other underwriting expenses ratio 8.7 % 5.6 % 7.8 % 9.2 % Combined ratio 115.4 % 95.5 % 109.5 % 109.1 % (1) Underwriting ratios are calculated by dividing the related expense by net premiums earned. (2) Insurance and Services MGAs recognize fees for service using revenue from contracts with customers accounting standards, whereas insurance companies recognize acquisition expenses using insurance contract accounting standards. While ultimate revenues and expenses recognized will match, there will be recognition timing differences based on the different accounting standards. 2020 Reinsurance Insurance & Services Core Eliminations (2) Corporate Segment Measure Reclass Total Gross premiums written $ 534.1 $ 25.5 $ 559.6 $ — $ 28.9 $ — $ 588.5 Net premiums written 497.3 16.0 513.3 — 28.9 — 542.2 Net premiums earned 575.6 7.1 582.7 — 28.1 — 610.8 Loss and loss adjustment expenses incurred, net 459.5 5.9 465.4 — (0.1) — 465.3 Acquisition costs, net 160.4 1.4 161.8 (0.1) 25.4 — 187.1 Other underwriting expenses 24.0 0.2 24.2 — 5.9 — 30.1 Underwriting loss (68.3) (0.4) (68.7) 0.1 (3.1) — (71.7) Services revenue — 1.7 1.7 (1.7) — — — Services expenses — 1.0 1.0 — — (1.0) — Net services fee income — 0.7 0.7 (1.7) — 1.0 — Services noncontrolling income — (0.3) (0.3) — — 0.3 — Net services income — 0.4 0.4 (1.7) — 1.3 — Segment loss (68.3) — (68.3) (1.6) (3.1) 1.3 (71.7) Net realized and unrealized investment gains 69.2 — 69.2 Net realized and unrealized investment gains from related party investment funds 195.0 — 195.0 Net investment income 14.7 — 14.7 Net corporate and other expenses (40.9) (1.0) (41.9) Interest expense (8.2) — (8.2) Foreign exchange losses (5.2) — (5.2) Income (loss) before income tax expense $ (68.3) $ — (68.3) (1.6) 221.5 0.3 151.9 Income tax expense — — (8.1) — (8.1) Net income (loss) (68.3) (1.6) 213.4 0.3 143.8 Net income attributable to noncontrolling interests — — — (0.3) (0.3) Net income (loss) available to SiriusPoint $ (68.3) $ (1.6) $ 213.4 $ — $ 143.5 Underwriting Ratios: (1) Loss ratio 79.8 % 83.1 % 79.9 % 76.2 % Acquisition cost ratio 27.9 % 19.7 % 27.8 % 30.6 % Other underwriting expenses ratio 4.2 % 2.8 % 4.2 % 4.9 % Combined ratio 111.9 % 105.6 % 111.9 % 111.7 % (1) Underwriting ratios are calculated by dividing the related expense by net premiums earned. (2) Insurance and Services MGAs recognize fees for service using revenue from contracts with customers accounting standards, whereas insurance companies recognize acquisition expenses using insurance contract accounting standards. While ultimate revenues and expenses recognized will match, there will be recognition timing differences based on the different accounting standards.
Schedule of net premiums written by location and reportable segment	The following tables provide a breakdown of ne t premiums written by client location and underwriting location by reportable segment for the years ended December 31, 2022, 2021 and 2020: 2022 Reinsurance Insurance & Services Corporate Total Net written premiums by client location: United States and Canada $ 746.9 $ 1,139.5 $ 0.5 $ 1,886.9 Europe 241.6 120.5 3.1 365.2 Bermuda, the Caribbean and Latin America 171.4 54.6 — 226.0 Asia and Other 39.7 31.4 — 71.1 Total net written premiums by client location $ 1,199.6 $ 1,346.0 $ 3.6 $ 2,549.2 Net written premiums by underwriting location: United States and Canada $ 569.2 $ 931.3 $ 0.5 $ 1,501.0 Europe 384.4 255.0 0.4 639.8 Bermuda, the Caribbean and Latin America 243.6 159.7 2.7 406.0 Asia and Other 2.4 — — 2.4 Total net written premiums by underwriting location $ 1,199.6 $ 1,346.0 $ 3.6 $ 2,549.2 2021 Reinsurance Insurance & Services Corporate Total Net written premiums by client location: United States and Canada $ 579.1 $ 560.3 $ 1.6 $ 1,141.0 Europe 309.5 36.4 (45.8) 300.1 Bermuda, the Caribbean and Latin America 114.3 13.7 — 128.0 Asia and Other 122.0 42.4 0.7 165.1 Total net written premiums by client location $ 1,124.9 $ 652.8 $ (43.5) $ 1,734.2 Net written premiums by underwriting location: United States and Canada $ 447.1 $ 408.9 $ 1.6 $ 857.6 Europe 379.8 93.0 (17.5) 455.3 Bermuda, the Caribbean and Latin America 246.1 150.9 (27.9) 369.1 Asia and Other 51.9 — 0.3 52.2 Total net written premiums by underwriting location $ 1,124.9 $ 652.8 $ (43.5) $ 1,734.2 2020 Reinsurance Insurance & Services Corporate Total Net written premiums by client location: United States and Canada $ 300.1 $ 13.8 $ — $ 313.9 Europe 83.7 1.9 28.9 114.5 Bermuda, the Caribbean and Latin America 108.6 — — 108.6 Asia and Other 4.9 0.3 — 5.2 Total net written premiums by client location $ 497.3 $ 16.0 $ 28.9 $ 542.2 Net written premiums by underwriting location: United States and Canada $ 236.3 $ 4.9 $ — $ 241.2 Bermuda, the Caribbean and Latin America 261.0 11.1 28.9 301.0 Total net written premiums by underwriting location $ 497.3 $ 16.0 $ 28.9 $ 542.2

Cash, cash equivalents, restr_2

Cash, cash equivalents, restricted cash and restricted investments (Tables)	12 Months Ended
	Dec. 31, 2022
Cash and Cash Equivalents [Abstract]
Schedule of restrictions on cash and cash equivalents and investments	The following table provides a summary of cash and cash equivalents, restricted cash and restricted investments as of December 31, 2022 and 2021: December 31, December 31, 2021 Cash and cash equivalents $ 705.3 $ 999.8 Restricted cash securing letter of credit facilities (1) 34.3 500.2 Restricted cash securing reinsurance contracts (2) 148.9 431.8 Restricted cash held by managing general underwriters 25.2 16.6 Total cash, cash equivalents and restricted cash (3) 913.7 1,948.4 Restricted investments securing reinsurance contracts and letter of credit facilities (1) (2) (4) 2,202.2 1,107.0 Total cash, cash equivalents, restricted cash and restricted investments $ 3,115.9 $ 3,055.4 (1) Restricted cash and restricted investments securing letter of credit facilities primarily pertains to letters of credit that have been issued to the Company’s clients in support of our obligations under reinsurance contracts. The Company will not be released from the obligation to provide these letters of credit until the reserves underlying the reinsurance contracts have been settled. The time period for which the Company expects each letter of credit to be in place varies from contract to contract but can last several years. (2) Restricted cash and restricted investments securing reinsurance contracts pertain to trust accounts securing the Company’s contractual obligations under certain reinsurance contracts that the Company will not be released from until the underlying risks have expired or have been settled. Restricted investments include certain investments in debt securities, short-term investments and limited partnership interests in Third Point Enhanced LP. The time period for which the Company expects these trust accounts to be in place varies from contract to contract, but can last several years. (3) Cash, cash equivalents and restricted cash as reported in the Company’s consolidated statements of cash flows. (4) Restricted investments include required deposits with certain insurance state regulatory agencies in order to maintain insurance licenses.
Schedule of cash and cash equivalents	The following table provides a summary of cash and cash equivalents, restricted cash and restricted investments as of December 31, 2022 and 2021: December 31, December 31, 2021 Cash and cash equivalents $ 705.3 $ 999.8 Restricted cash securing letter of credit facilities (1) 34.3 500.2 Restricted cash securing reinsurance contracts (2) 148.9 431.8 Restricted cash held by managing general underwriters 25.2 16.6 Total cash, cash equivalents and restricted cash (3) 913.7 1,948.4 Restricted investments securing reinsurance contracts and letter of credit facilities (1) (2) (4) 2,202.2 1,107.0 Total cash, cash equivalents, restricted cash and restricted investments $ 3,115.9 $ 3,055.4 (1) Restricted cash and restricted investments securing letter of credit facilities primarily pertains to letters of credit that have been issued to the Company’s clients in support of our obligations under reinsurance contracts. The Company will not be released from the obligation to provide these letters of credit until the reserves underlying the reinsurance contracts have been settled. The time period for which the Company expects each letter of credit to be in place varies from contract to contract but can last several years. (2) Restricted cash and restricted investments securing reinsurance contracts pertain to trust accounts securing the Company’s contractual obligations under certain reinsurance contracts that the Company will not be released from until the underlying risks have expired or have been settled. Restricted investments include certain investments in debt securities, short-term investments and limited partnership interests in Third Point Enhanced LP. The time period for which the Company expects these trust accounts to be in place varies from contract to contract, but can last several years. (3) Cash, cash equivalents and restricted cash as reported in the Company’s consolidated statements of cash flows. (4) Restricted investments include required deposits with certain insurance state regulatory agencies in order to maintain insurance licenses.

Fair value measurements (Tables

Fair value measurements (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of investments, categorized by the level of the fair value hierarchy	The following tables present the Company’s investments, categorized by the level of the fair value hierarchy as of December 31, 2022 and 2021: 2022 Quoted prices in active markets Significant other observable inputs Significant unobservable inputs Total (Level 1) (Level 2) (Level 3) Assets Asset-backed securities $ — $ 230.7 $ — $ 230.7 Residential mortgage-backed securities — 340.7 — 340.7 Commercial mortgage-backed securities — 61.2 — 61.2 Corporate debt securities — 415.7 — 415.7 U.S. government and government agency 1,546.2 4.4 — 1,550.6 Non-U.S. government and government agency 5.0 31.6 — 36.6 Total debt securities, available for sale 1,551.2 1,084.3 — 2,635.5 Asset-backed securities — 553.7 — 553.7 Residential mortgage-backed securities — 133.6 — 133.6 Commercial mortgage-backed securities — 113.4 — 113.4 Corporate debt securities — 363.5 — 363.5 U.S. government and government agency 264.1 6.3 — 270.4 Non-U.S. government and government agency 8.7 79.5 — 88.2 Preferred stocks — — 3.2 3.2 Total debt securities, trading 272.8 1,250.0 3.2 1,526.0 Total equity securities 1.6 — — 1.6 Short-term investments 972.8 11.8 — 984.6 Other long-term investments — — 227.3 227.3 Derivative assets — — 9.5 9.5 $ 2,798.4 $ 2,346.1 $ 240.0 5,384.5 Cost and equity method investments 104.8 Investments in funds valued at NAV 173.9 Total assets $ 5,663.2 Liabilities Total securities sold, not yet purchased $ 27.0 $ — $ — $ 27.0 Securities sold under an agreement to repurchase — 18.0 — 18.0 Liability-classified capital instruments — 39.0 21.4 60.4 Derivative liabilities — — 8.6 8.6 Total liabilities $ 27.0 $ 57.0 $ 30.0 $ 114.0 2021 Quoted prices in active markets Significant other observable inputs Significant unobservable inputs Total (Level 1) (Level 2) (Level 3) Assets Asset-backed securities $ — $ 513.1 $ — $ 513.1 Residential mortgage-backed securities — 301.9 — 301.9 Commercial mortgage-backed securities — 147.3 — 147.3 Corporate debt securities — 602.6 — 602.6 U.S. Government and government agency 360.9 24.5 — 385.4 Non-U.S. government and government agency 17.8 114.5 — 132.3 U.S. States, municipalities, and political subdivision — 0.2 — 0.2 Preferred stocks — — 2.8 2.8 Total debt securities, trading 378.7 1,704.1 2.8 2,085.6 Fixed income mutual funds 2.1 — — 2.1 Common stocks 0.7 — — 0.7 Total equity securities 2.8 — — 2.8 Short-term investments 1,073.2 2.6 — 1,075.8 Other long-term investments — — 262.0 262.0 Derivative assets 0.2 — 0.4 0.6 $ 1,454.9 $ 1,706.7 $ 265.2 3,426.8 Cost and equity method investments 89.2 Investments in funds valued at NAV 1,014.5 Total assets $ 4,530.5 Liabilities Liability-classified capital instruments $ — $ 30.6 $ 57.2 $ 87.8 Derivative liabilities — — 3.2 3.2 Total liabilities $ — $ 30.6 $ 60.4 $ 91.0
Reconciliation of assets measured at fair value using Level 3 inputs	The following table presents the reconciliation of all investments measured at fair value using Level 3 inputs for the years ended December 31, 2022: January 1, Transfers in to (out of) Level 3 Purchases Sales Realized and Unrealized Gains (Losses) (1) Change in Unrealized Gains (Losses) in OCI December 31, Assets Preferred stocks $ 2.8 $ — $ — $ — $ 0.4 $ — $ 3.2 Other long-term investments 262.1 — 2.1 (24.7) (12.2) — 227.3 Derivative assets 0.4 — 43.3 — (34.2) — 9.5 Total assets $ 265.3 $ — $ 45.4 $ (24.7) $ (46.0) $ — $ 240.0 Liabilities Liability-classified capital instruments $ (57.2) $ — $ — $ — $ 35.8 $ — $ (21.4) Derivative liabilities (3.2) — — (3.4) (2.0) — (8.6) Total liabilities $ (60.4) $ — $ — $ (3.4) $ 33.8 $ — $ (30.0) (1) Total change in realized and unrealized gains (losses) recorded on Level 3 financial instruments is included in total realized and unrealized investment gains (losses) and net investment income in the consolidated statements of income (loss). Realized and unrealized gains (losses) related to underwriting-related derivative assets and liabilities are included in other underwriting expenses, net of foreign exchange (gains) losses, in the consolidated statements of income (loss). The following table presents the reconciliation of all investments measured at fair value using Level 3 inputs for the year ended December 31, 2021: January 1, Transfers in to (out of) Level 3 Purchases Assets Acquired (1) Sales Realized and Unrealized Gains (Losses) (2) December 31, Assets Preferred stocks $ — $ — $ 10.0 $ 2.8 $ (10.0) $ — $ 2.8 Other long-term investments 4.0 — 71.2 216.6 (24.9) (4.8) 262.1 Derivative assets 1.2 (1.2) — 0.3 (1.4) 1.5 0.4 Loan participations — — 9.0 32.8 (42.8) 1.0 — Total assets $ 5.2 $ (1.2) $ 90.2 $ 252.5 $ (79.1) $ (2.3) $ 265.3 Liabilities Liability-classified capital instruments $ — $ 27.0 $ (137.6) $ — $ — $ 53.4 $ (57.2) Contingent consideration liabilities — — — (0.7) 1.9 (1.2) — Derivative liabilities (1.0) 1.2 (0.4) (2.0) — (1.0) (3.2) Total liabilities $ (1.0) $ 28.2 $ (138.0) $ (2.7) $ 1.9 $ 51.2 $ (60.4) (1) Includes amounts acquired as a result of the Sirius Group acquisition. (2) Total change in realized and unrealized gains (losses) recorded on Level 3 financial instruments is included in total realized and unrealized investment gains (losses) and net investment income in the consolidated statements of income (loss). Realized and unrealized gains (losses) related to underwriting-related derivative assets and liabilities are included in other underwriting expenses, net of foreign exchange (gains) losses, in the consolidated statements of income (loss).
Reconciliation of liabilities measured at fair value using Level 3 inputs	The following table presents the reconciliation of all investments measured at fair value using Level 3 inputs for the years ended December 31, 2022: January 1, Transfers in to (out of) Level 3 Purchases Sales Realized and Unrealized Gains (Losses) (1) Change in Unrealized Gains (Losses) in OCI December 31, Assets Preferred stocks $ 2.8 $ — $ — $ — $ 0.4 $ — $ 3.2 Other long-term investments 262.1 — 2.1 (24.7) (12.2) — 227.3 Derivative assets 0.4 — 43.3 — (34.2) — 9.5 Total assets $ 265.3 $ — $ 45.4 $ (24.7) $ (46.0) $ — $ 240.0 Liabilities Liability-classified capital instruments $ (57.2) $ — $ — $ — $ 35.8 $ — $ (21.4) Derivative liabilities (3.2) — — (3.4) (2.0) — (8.6) Total liabilities $ (60.4) $ — $ — $ (3.4) $ 33.8 $ — $ (30.0) (1) Total change in realized and unrealized gains (losses) recorded on Level 3 financial instruments is included in total realized and unrealized investment gains (losses) and net investment income in the consolidated statements of income (loss). Realized and unrealized gains (losses) related to underwriting-related derivative assets and liabilities are included in other underwriting expenses, net of foreign exchange (gains) losses, in the consolidated statements of income (loss). The following table presents the reconciliation of all investments measured at fair value using Level 3 inputs for the year ended December 31, 2021: January 1, Transfers in to (out of) Level 3 Purchases Assets Acquired (1) Sales Realized and Unrealized Gains (Losses) (2) December 31, Assets Preferred stocks $ — $ — $ 10.0 $ 2.8 $ (10.0) $ — $ 2.8 Other long-term investments 4.0 — 71.2 216.6 (24.9) (4.8) 262.1 Derivative assets 1.2 (1.2) — 0.3 (1.4) 1.5 0.4 Loan participations — — 9.0 32.8 (42.8) 1.0 — Total assets $ 5.2 $ (1.2) $ 90.2 $ 252.5 $ (79.1) $ (2.3) $ 265.3 Liabilities Liability-classified capital instruments $ — $ 27.0 $ (137.6) $ — $ — $ 53.4 $ (57.2) Contingent consideration liabilities — — — (0.7) 1.9 (1.2) — Derivative liabilities (1.0) 1.2 (0.4) (2.0) — (1.0) (3.2) Total liabilities $ (1.0) $ 28.2 $ (138.0) $ (2.7) $ 1.9 $ 51.2 $ (60.4) (1) Includes amounts acquired as a result of the Sirius Group acquisition. (2) Total change in realized and unrealized gains (losses) recorded on Level 3 financial instruments is included in total realized and unrealized investment gains (losses) and net investment income in the consolidated statements of income (loss). Realized and unrealized gains (losses) related to underwriting-related derivative assets and liabilities are included in other underwriting expenses, net of foreign exchange (gains) losses, in the consolidated statements of income (loss).
Schedule of financial instruments for which the carrying value differs from the estimated fair values	The following table includes financial instruments for which the carrying value differs from the estimated fair values as of December 31, 2022 and 2021. The fair values of the below financial instruments are based on observable inputs and are considered Level 2 measurements. December 31, 2022 December 31, 2021 Fair Value Carrying Value Fair Value Carrying Value 2017 SEK Subordinated Notes $ 259.0 $ 258.6 $ 302.3 $ 296.3 2016 SIG Senior Notes 343.7 404.8 412.8 406.0 2015 Senior Notes 112.6 114.6 120.5 114.4 Series B preference shares $ 186.0 $ 200.0 $ 220.9 $ 200.0

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Schedule of debt securities	The following tables provide the cost or amortized cost, gross unrealized investment gains (losses), net foreign currency gains (losses), and fair value of the Company's debt securities as of December 31, 2022 and 2021: December 31, 2022 Cost or Gross Gross unrealized losses (3) Net foreign Fair value Debt securities, available for sale Asset-backed securities $ 234.1 $ 0.9 $ (4.3) $ — $ 230.7 Residential mortgage-backed securities 354.3 0.3 (13.9) — 340.7 Commercial mortgage-backed securities 62.1 — (0.9) — 61.2 Corporate debt securities 428.5 0.5 (13.1) (0.2) 415.7 U.S. government and government agency (1) 1,561.9 3.2 (14.5) — 1,550.6 Non-U.S. government and government agency 37.2 — (0.7) 0.1 36.6 Total debt securities, available for sale (2)(3) $ 2,678.1 $ 4.9 $ (47.4) $ (0.1) $ 2,635.5 Debt securities, trading Asset-backed securities $ 575.5 $ 0.1 $ (21.9) $ — $ 553.7 Residential mortgage-backed securities 155.9 — (22.3) — 133.6 Commercial mortgage-backed securities 130.5 — (17.1) — 113.4 Corporate debt securities 391.4 — (27.2) (0.7) 363.5 U.S. government and government agency (1) 278.6 — (8.2) — 270.4 Non-U.S. government and government agency 95.8 — (4.0) (3.6) 88.2 Preferred stocks 2.4 0.8 — — 3.2 Total debt securities, trading $ 1,630.1 $ 0.9 $ (100.7) $ (4.3) $ 1,526.0 December 31, 2021 Cost or Gross Gross Net foreign Fair value Asset-backed securities $ 512.6 $ 0.9 $ (0.4) $ — $ 513.1 Residential mortgage-backed securities 306.5 — (4.6) — 301.9 Commercial mortgage-backed securities 148.4 0.6 (1.7) — 147.3 Corporate debt securities 605.5 0.6 (3.5) — 602.6 U.S. government and government agency (1) 388.1 0.1 (2.8) — 385.4 Non-U.S. government and government agency 135.4 0.3 (2.6) (0.8) 132.3 U.S. states, municipalities and political subdivision 0.2 — — — 0.2 Preferred stocks 2.6 0.2 — — 2.8 Total debt securities (2)(3) $ 2,099.3 $ 2.7 $ (15.6) $ (0.8) $ 2,085.6 (1) The Company had $27.0 million short positions in long duration U.S. Treasuries as of December 31, 2022 (As of December 31, 2021, there were no short positions in long duration U.S. Treasuries). These amounts are included in securities sold, not yet purchased in the consolidated balance sheets. (2) As of December 31, 2022, all debt securities classified as available for sale that are in a gross unrealized loss position have been in a gross unrealized loss position for less than 12 months. As of December 31, 2021, there were no debt securities classified as available for sale. (3) As of December 31, 2022, the Company did not record an allowance for credit losses on the AFS portfolio. As of December 31, 2021, there were no debt securities classified as available for sale.
Schedule of debt securities by contractual maturity	The following table provides the cost or amortized cost and fair value of the Company's debt securities bifurcated into debt securities held for trading (“trading”) and AFS as of December 31, 2022 and 2021 by contractual maturity. Actual maturities could differ from contractual maturities because borrowers may have the right to call or prepay certain obligations with or without call or prepayment penalties. December 31, 2022 December 31, 2021 Debt securities, trading Debt securities, AFS Debt securities, trading Cost or Fair value Cost or Fair value Cost or Fair value Due in one year or less $ 240.4 $ 230.9 $ 104.2 $ 104.0 $ 145.6 $ 145.1 Due after one year through five years 426.5 407.0 1,822.7 1,802.0 870.4 862.4 Due after five years through ten years 63.4 55.7 95.8 92.3 69.6 68.6 Due after ten years 35.5 28.5 4.9 4.6 43.6 44.4 Mortgage-backed and asset-backed securities 861.9 800.7 650.5 632.6 967.5 962.3 Preferred stocks 2.4 3.2 — — 2.6 2.8 Total debt securities $ 1,630.1 $ 1,526.0 $ 2,678.1 $ 2,635.5 $ 2,099.3 $ 2,085.6 (1) As of December 31, 2021, there were no debt securities classified as available for sale.
Schedule of the ratings and fair value of debt securities	The following table summarizes the ratings and fair value of debt securities held in the Company's investment portfolio as of December 31, 2022 and 2021: 2022 2021 Debt securities, trading Debt securities, AFS Debt securities, trading AAA $ 564.4 $ 172.8 $ 696.4 AA 523.2 1,907.6 884.1 A 181.1 188.9 278.5 BBB 158.1 149.9 153.1 Other 99.2 216.3 73.5 Total debt securities (1)(2) $ 1,526.0 $ 2,635.5 $ 2,085.6 (1) Credit ratings are assigned based on the following hierarchy: 1) Standard & Poor's ("S&P") and 2) Moody's Investors Service. (2) As of December 31, 2021, there were no debt securities classified as available for sale.
Schedule of equity securities and other long-term investments	The cost or amortized cost, gross unrealized investment gains and losses, net foreign currency gains, and fair values of the Company’s equity securities and other long-term investments as of December 31, 2022 and 2021 were as follows: Cost or Gross Gross Net foreign Fair value December 31, 2022 Equity securities $ 1.8 $ — $ (0.2) $ — $ 1.6 Other long-term investments $ 392.0 $ 27.5 $ (41.8) $ (0.5) $ 377.2 December 31, 2021 Equity securities $ 4.5 $ 0.1 $ (2.0) $ 0.2 $ 2.8 Other long-term investments $ 443.0 $ 28.9 $ (16.8) $ 1.0 $ 456.1 The carrying value of other long-term investments as of December 31, 2022 and 2021 were as follows: December 31, December 31, 2021 Hedge funds and private equity funds (1) $ 84.9 $ 195.7 Strategic Investments (2) 262.0 215.3 Other investments (2) 30.3 45.1 Total other long-term investments $ 377.2 $ 456.1 (1) Includes $45.1 million of investments carried at NAV (December 31, 2021 - $115.2 million) and $25.1 million of investments classified as Level 3 (December 31, 2021 - $80.5 million) within the fair value hierarchy. (2) As of December 31, 2022, the Company had $16.0 million of unfunded commitments relating to these investments (December 31, 2021 - $13.8 million).
Schedule of investments in hedge funds and private equity interests by investment objective and sector	The following table summarizes investments in hedge funds and private equity interests by investment objective and sector as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Fair value Unfunded Fair value Unfunded Hedge funds Long/short multi-sector $ 8.8 $ — $ 19.8 $ — Distressed mortgage credit — — 24.6 — Private credit 20.7 — 24.2 — Other 0.2 — 1.7 — Total hedge funds 29.7 — 70.3 — Private equity funds Energy infrastructure & services 10.2 5.0 48.4 19.0 Multi-sector 6.6 5.1 10.1 5.1 Healthcare 19.9 0.3 31.0 2.2 Life settlement 13.6 — 12.9 — Manufacturing/Industrial — — 19.9 — Private equity secondaries 0.4 0.1 0.5 0.4 Other 4.5 21.0 2.6 — Total private equity funds 55.2 31.5 125.4 26.7 Total hedge and private equity funds included in other long-term investments $ 84.9 $ 31.5 $ 195.7 $ 26.7 (1) The table excludes the Company’s investments in TP Enhanced Fund, TP Venture Fund and TP Venture Fund II. See “Investment in related party investment funds” below for additional information.
Schedule of other long-term investments subject to restrictions	The following summarizes the December 31, 2022 fair value of hedge funds subject to restrictions on redemption frequency and advance notice period requirements for investments in active hedge funds: Notice Period Redemption Frequency 1-29 days 30-59 days 60-89 days 90-119 days 120+ days Total Quarterly $ — $ 0.1 $ 8.7 $ 0.1 $ — $ 8.9 Semi-annual — — 0.1 — — 0.1 Annual — — — 0.1 20.6 20.7 Total $ — $ 0.1 $ 8.8 $ 0.2 $ 20.6 $ 29.7 As of December 31, 2022, investments in private equity funds were subject to lock-up periods as follows: 1 - 3 years 3 – 5 years 5 – 10 years Total Private equity funds – expected lock-up or commitment period remaining $ 19.5 $ 19.9 $ 15.8 $ 55.2
Schedule of investments in related party investment funds	The following table provides the fair value of the Company's investments in related party investment funds as of December 31, 2022 and 2021: December 31, December 31, 2021 Third Point Enhanced LP $ 100.3 $ 878.2 Third Point Venture Offshore Fund I LP 26.0 31.4 Third Point Venture Offshore Fund II LP 2.5 — Investments in related party investment funds, at fair value $ 128.8 $ 909.6

Total realized and unrealized_2

Total realized and unrealized investment gains (losses) and net investment income (Tables)	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Schedule of total realized and unrealized investment gains (losses) and net investment income	Total realized and unrealized investment gains (losses) and net investment income for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Debt securities, available for sale $ 35.1 $ — $ — Debt securities, trading (115.6) (4.9) 72.7 Short-term investments 17.7 1.6 — Other long-term investments (10.6) 35.2 — Equity securities (0.4) (2.5) — Net realized and unrealized investment gains (losses) from related party investment funds (210.5) 304.0 195.0 Realized and unrealized investment gains and net investment income before other investment expenses and investment income (loss) on cash and cash equivalents (284.3) 333.4 267.7 Investment expenses (20.3) (11.6) (1.1) Net investment loss on cash and cash equivalents (18.1) (9.3) 12.3 Total realized and unrealized investment gains (losses) and net investment income (loss) $ (322.7) $ 312.5 $ 278.9
Schedule of net realized investment gains (losses)	Net realized and unrealized investment gains (losses) for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Gross realized gains $ 56.2 $ 40.4 $ 64.3 Gross realized losses (132.3) (9.6) (15.9) Net realized gains (losses) on investments (76.1) 30.8 48.4 Net unrealized gains (losses) on investments (149.4) (47.7) 20.8 Net realized and unrealized gains (losses) on investments (1) (2) $ (225.5) $ (16.9) $ 69.2 (1) Excludes realized and unrealized gains (losses) on the Company’s investments in related party investment funds and unrealized gains (losses) from available for sale investments, net of tax. (2) Includes net realized and unrealized gains (losses) of $5.6 million from related party investments included in other long-term investments for the year ended December 31, 2022 (2021 - $12.9 million and 2020 - none). Net realized investment gains (losses) for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Debt securities, available for sale $ 2.7 $ — $ — Debt securities, trading (66.7) 12.3 46.4 Short-term investments (2.9) (0.1) — Equity securities (2.3) (0.1) — Other long-term investments 2.9 14.1 — Net investment income (loss) on cash and cash equivalents (9.8) 4.6 2.0 Net realized investment gains (losses) (1) $ (76.1) $ 30.8 $ 48.4 (1) Includes realized gains (losses) due to foreign currency of $(25.2) million for the year ended December 31, 2022 (2021 - $4.5 million and 2020 - $1.6 million).
Schedule of net unrealized investment gains (losses)	Net realized and unrealized investment gains (losses) for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Gross realized gains $ 56.2 $ 40.4 $ 64.3 Gross realized losses (132.3) (9.6) (15.9) Net realized gains (losses) on investments (76.1) 30.8 48.4 Net unrealized gains (losses) on investments (149.4) (47.7) 20.8 Net realized and unrealized gains (losses) on investments (1) (2) $ (225.5) $ (16.9) $ 69.2 (1) Excludes realized and unrealized gains (losses) on the Company’s investments in related party investment funds and unrealized gains (losses) from available for sale investments, net of tax. (2) Includes net realized and unrealized gains (losses) of $5.6 million from related party investments included in other long-term investments for the year ended December 31, 2022 (2021 - $12.9 million and 2020 - none). Net unrealized investment gains (losses) for the years ended December 31, 2022, 2021 and 2020 consisted of the following: 2022 2021 2020 Debt securities, trading (1) $ (105.0) $ (40.2) $ 14.9 Short-term investments (0.3) 1.4 — Equity securities 1.8 (2.5) — Other long-term investments (25.7) 11.2 — Net investment income (loss) on cash and cash equivalents (20.2) (17.6) 5.9 Net unrealized investment gains (losses) (2) $ (149.4) $ (47.7) $ 20.8 (1) Includes unrealized losses, excluding foreign currency, of $15.0 million for the year ended December 31, 2022 (2021 - $23.9 million and 2020 - none). (2) Includes unrealized gains (losses) due to foreign currency of $17.9 million for the year ended December 31, 2022 (2021 - $(32.8) million and 2020 - $6.0 million). The following table summarizes the amount of total (losses) included in earnings attributable to unrealized investment (losses) – Level 3 investments for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Debt securities, trading $ 0.7 $ — $ — Other long-term investments (15.4) (5.7) — Total unrealized investment (losses) – Level 3 investments $ (14.7) $ (5.7) $ —

Investments in unconsolidated_2

Investments in unconsolidated entities (Tables)	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Schedule of other long-term investments	The following table presents the components of other long-term investments as of December 31, 2022 and 2021: December 31, December 31, 2021 Equity method eligible unconsolidated entities, using the fair value option (1) $ 147.9 $ 168.1 Equity method investments 41.8 83.2 Other unconsolidated investments, at fair value (2) 124.5 198.8 Other unconsolidated investments, at cost (3) 63.0 6.0 Total other long-term investments $ 377.2 $ 456.1 (1) Excludes the Company’s investments in Related Party Investment Funds, which are equity method eligible but are carried outside of other long-term investments. See Notes 7 and 11 for additional information on these related party investment funds. (2) Includes other long-term investments that are not equity method eligible and are measured at fair value. (3) The Company has elected to apply the cost adjusted for market observable events less impairment measurement alternative to investments that do not meet the criteria to be accounted for under the equity method, in which the investment is measured at cost and remeasured to fair value when impaired or upon observable transaction prices.

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative instruments	The following table summarizes information on the classification and amount of the fair value of derivatives not designated as hedging instruments within the Company's consolidated balance sheets as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Derivatives not designated as hedging instruments Derivative assets at fair value (1) Derivative liabilities at fair value (2) Notional Derivative assets at fair value (1) Derivative liabilities at fair value (2) Notional Foreign currency forwards $ 9.0 $ — $ 425.1 $ — $ 1.3 $ 83.6 Foreign currency swaps — 1.5 264.6 — 1.7 40.0 Weather derivatives — 4.9 30.6 — 0.8 6.2 Foreign currency futures contracts — — — 0.2 — 133.9 Equity warrants — — — 0.1 — 0.1 Interest rate cap $ — $ — $ — $ — $ — $ 250.0 (1) Derivative assets are classified within other assets (2) Derivative liabilities are classified within accounts payable, accrued expenses and other liabilities The following tables identify the listing currency, fair value and notional amounts of underwriting-related derivatives included in the consolidated balance sheets as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Derivative assets Listing currency Fair Value Notional Amounts (1) Fair Value Notional Amounts (1) Reinsurance contracts accounted for as derivative assets British Pound $ 0.5 $ 16.5 $ 1.2 $ 49.3 Reinsurance contracts accounted for as derivative liabilities British Pound $ 2.2 $ 76.4 $ 0.1 $ 37.4
Schedule of net impact on earnings relating to derivatives	The following table summarizes information on the classification and net impact on earnings, recognized in the Company's consolidated statements of income (loss) relating to derivatives during the years ended December 31, 2022, 2021 and 2020: Derivatives not designated as hedging instruments Classification of gains (losses) recognized in earnings 2022 2021 2020 Foreign currency futures contracts Foreign exchange (gains) losses $ (32.1) $ (8.0) $ — Foreign currency forwards Foreign exchange (gains) losses (8.1) (1.3) — Weather derivatives Other revenues 7.3 0.9 — Foreign currency swaps Foreign exchange (gains) losses 1.5 0.2 — Equity warrants Net realized and unrealized investment gains (losses) (0.1) (0.3) — Foreign currency call options Foreign exchange (gains) losses $ — $ 0.4 $ —

Variable and voting interest _2

Variable and voting interest entities (Tables)	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reconciliation of noncontrolling interests	The following table is a reconciliation of the beginning and ending carrying amount of noncontrolling interests for the years ended December 31, 2022 and 2021: 2022 2021 Balance, beginning of period $ (0.4) $ 1.4 Sirius Group acquisition and other business combinations (1) 0.8 0.3 Net income (loss) attributable to noncontrolling interests 0.8 (2.3) Contributions (Redemptions) — 0.2 Derecognition of noncontrolling interest (2) 6.7 — Balance, end of period $ 7.9 $ (0.4) (1) See Note 3 for additional information related to the acquisition of Sirius Group.
Schedule of information related to unconsolidated variable interest entities	The following table presents total assets of unconsolidated VIEs in which the Company holds a variable interest, as well as the maximum exposure to loss associated with these VIEs as of December 31, 2022 and December 31, 2021: Maximum Exposure to Loss Total VIE Assets On-Balance Sheet Off-Balance Sheet Total December 31, 2022 Other long-term investments (1) $ 211.5 $ 144.0 $ 2.0 $ 146.0 December 31, 2021 Other long-term investments (1) $ 326.2 $ 177.5 $ 2.1 $ 179.6

Loss and loss adjustment expe_2

Loss and loss adjustment expense reserves (Tables)	12 Months Ended
	Dec. 31, 2022
Insurance [Abstract]
Schedule of loss and loss adjustment expense reserves	As of December 31, 2022 and 2021, loss and loss adjustment expense reserves in the consolidated balance sheets was comprised of the following: December 31, December 31, 2021 Case loss and loss adjustment expense reserves $ 1,980.2 $ 1,916.8 Incurred but not reported loss and loss adjustment expense reserves 3,226.5 2,868.2 Unallocated loss adjustment expense reserves 62.0 55.8 Deferred gains on retroactive reinsurance contracts — 0.6 $ 5,268.7 $ 4,841.4 The following table represents the activity in the loss and loss adjustment expense reserves for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Gross reserves for loss and loss adjustment expenses, beginning of year $ 4,841.4 $ 1,310.1 $ 1,111.7 Less: loss and loss adjustment expenses recoverable, beginning of year (1,215.3) (14.4) (5.5) Less: deferred charges on retroactive reinsurance contracts (1.4) (6.0) (6.7) Net reserves for loss and loss adjustment expenses, beginning of year 3,624.7 1,289.7 1,099.5 Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: Current year 1,609.7 1,369.1 431.5 Prior years (21.3) (42.6) 33.8 Total incurred loss and loss adjustment expenses 1,588.4 1,326.5 465.3 Net loss and loss adjustment expenses paid in respect of losses occurring in: Current year (316.1) (271.2) (73.6) Prior years (939.2) (1,178.9) (209.5) Total net paid losses (1,255.3) (1,450.1) (283.1) Foreign currency translation (66.3) (9.2) 8.0 Amounts acquired as a result of Sirius Group acquisition (1) — 2,467.8 — Net reserves for loss and loss adjustment expenses, end of year 3,891.5 3,624.7 1,289.7 Plus: loss and loss adjustment expenses recoverable, end of year 1,376.2 1,215.3 14.4 Plus: deferred charges on retroactive reinsurance contracts (2) 1.0 1.4 6.0 Gross reserves for loss and loss adjustment expenses, end of year $ 5,268.7 $ 4,841.4 $ 1,310.1 (1) Represents the fair value of Sirius Group’s reserves for claims and claim expenses, net of reinsurance recoverables, acquired at February 26, 2021. See Note 3 for additional information related to the acquisition of Sirius Group. (2) Deferred charges on retroactive contracts are recorded in other assets on the Company’s consolidated balance sheets.
Schedule of total loss and loss adjustment expenses incurred, net and net loss and loss adjustment expenses paid by accident year by line of business	The following tables provide a breakdown of the Company’s loss and allocated loss adjustment expenses incurred, net and net loss and allocated loss adjustment expenses paid by accident year by line of business for the Company’s Reinsurance segment for the year ended December 31, 2022. The information related to loss and allocated loss adjustment expenses incurred, net and net loss and allocated loss adjustment expenses paid for the years ended December 31, 2013 through 2021 is presented as supplementary information and is unaudited: Aviation & Space Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 38.4 $ 34.3 $ 31.2 $ 29.9 $ 30.8 $ 30.9 $ 31.0 $ 30.7 $ 31.4 $ 31.6 $ — 2014 — 31.8 34.3 30.8 29.8 29.7 28.3 30.0 29.2 29.7 (2.2) 2015 — — 34.6 31.0 35.0 34.0 33.3 33.5 34.3 34.9 1.7 2016 — — — 31.7 32.0 33.0 35.3 34.9 35.2 36.3 (0.1) 2017 — — — — 33.7 42.6 43.8 45.3 45.7 48.4 0.5 2018 — — — — — 47.7 50.3 58.2 60.7 63.2 3.1 2019 — — — — — — 60.2 71.6 75.7 93.8 21.2 2020 — — — — — — — 39.8 41.5 39.9 1.5 2021 — — — — — — — — 41.9 37.5 9.8 2022 — — — — — — — — — 58.2 46.0 Total $ 473.5 $ 81.5 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 12.4 $ 18.1 $ 22.1 $ 24.7 $ 26.4 $ 27.1 $ 28.4 $ 28.5 $ 29.4 $ 29.4 2014 — 6.2 14.2 19.7 22.0 23.6 24.2 25.7 25.3 25.8 2015 — — 8.8 18.2 24.2 30.5 32.0 32.8 33.4 34.0 2016 — — — 7.5 19.2 26.3 28.7 32.0 33.2 34.3 2017 — — — — 8.9 23.5 32.2 35.5 39.1 40.6 2018 — — — — — 14.2 27.3 36.5 42.2 46.2 2019 — — — — — — 8.3 22.3 32.3 37.7 2020 — — — — — — — 10.8 22.1 29.5 2021 — — — — — — — — 6.5 15.0 2022 — — — — — — — — — 6.9 Total $ 299.4 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 174.1 Net reserves for loss and allocated loss adjustment expenses prior to 2013 2.4 Aviation & Space - net reserves for loss and allocated loss adjustment expenses, end of year $ 176.5 Casualty Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 72.1 $ 53.4 $ 57.9 $ 57.9 $ 57.9 $ 57.8 $ 57.4 $ 57.6 $ 57.0 $ 57.2 $ — 2014 — 178.1 178.3 182.4 171.5 172.6 171.8 172.3 171.8 171.3 0.8 2015 — — 223.5 256.7 237.5 237.6 237.9 240.4 240.4 239.8 5.9 2016 — — — 270.3 267.2 265.5 261.7 264.6 265.2 264.6 12.1 2017 — — — — 246.2 253.5 254.7 258.8 261.9 262.5 27.7 2018 — — — — — 317.3 340.4 346.8 349.3 351.9 63.7 2019 — — — — — — 388.8 423.9 441.4 446.0 138.3 2020 — — — — — — — 377.7 416.8 414.9 214.3 2021 — — — — — — — — 351.8 342.5 211.9 2022 — — — — — — — — — 391.4 317.5 Total $ 2,942.1 $ 992.2 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 11.3 $ 27.8 $ 40.4 $ 46.8 $ 51.4 $ 53.6 $ 55.0 $ 55.4 $ 56.0 $ 55.9 2014 — 51.1 128.3 147.6 153.5 161.1 164.3 166.2 167.2 168.2 2015 — — 75.7 151.7 184.6 201.3 210.9 218.9 223.7 226.7 2016 — — — 64.9 171.4 196.4 212.3 224.0 232.3 239.3 2017 — — — — 82.3 136.1 157.2 180.1 199.0 212.6 2018 — — — — — 57.2 111.2 151.0 211.2 237.5 2019 — — — — — — 45.5 116.2 181.2 236.9 2020 — — — — — — — 38.0 65.7 137.2 2021 — — — — — — — — 29.1 77.9 2022 — — — — — — — — — 24.6 Total $ 1,616.8 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 1,325.3 Net reserves for loss and allocated loss adjustment expenses prior to 2013 9.5 Casualty - net reserves for loss and allocated loss adjustment expenses, end of year $ 1,334.8 Contingency Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ — 2014 — — — — — — — — — — — 2015 — — — — — — — — — — — 2016 — — — — — — — — — — — 2017 — — — — 0.5 0.5 1.1 0.7 0.8 0.7 — 2018 — — — — — 1.4 1.7 1.5 1.6 1.4 — 2019 — — — — — — 1.8 1.8 1.8 1.8 — 2020 — — — — — — — 13.7 11.2 11.7 1.2 2021 — — — — — — — — 8.4 10.4 0.1 2022 — — — — — — — — — 8.7 0.6 Total $ 34.8 $ 1.9 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 2014 — — — — — — — — — — 2015 — — — — — — — — — — 2016 — — — — — — — — — — 2017 — — — — (0.1) 0.1 0.4 0.6 0.6 0.6 2018 — — — — — (0.1) 0.8 1.3 1.3 1.4 2019 — — — — — — (0.1) 1.1 1.2 1.5 2020 — — — — — — — 3.2 4.1 11.2 2021 — — — — — — — — 3.6 7.3 2022 — — — — — — — — — 4.0 Total $ 26.1 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 8.7 Net reserves for loss and allocated loss adjustment expenses prior to 2013 0.8 Contingency - net reserves for loss and allocated loss adjustment expenses, end of year $ 9.5 Credit & Bond Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 29.1 $ 28.3 $ 27.4 $ 27.0 $ 27.8 $ 27.4 $ 27.7 $ 27.8 $ 28.3 $ 28.7 $ 0.8 2014 — 25.1 24.6 25.2 23.2 22.2 22.0 21.9 22.1 22.1 (2.0) 2015 — — 23.7 23.3 22.5 20.9 20.0 19.4 19.4 19.7 0.6 2016 — — — 19.3 17.9 17.6 16.7 16.3 16.6 16.0 0.1 2017 — — — — 24.3 25.0 24.0 22.5 22.5 21.5 3.2 2018 — — — — — 30.8 31.3 30.5 30.8 29.7 1.5 2019 — — — — — — 40.2 38.4 38.0 35.1 3.0 2020 — — — — — — — 44.7 41.1 38.9 10.5 2021 — — — — — — — — 22.5 21.6 9.6 2022 — — — — — — — — — 37.5 25.8 Total $ 270.8 $ 53.1 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 11.1 $ 19.0 $ 22.0 $ 23.2 $ 23.9 $ 24.0 $ 24.2 $ 24.2 $ 24.5 $ 26.2 2014 — 7.5 13.6 17.9 19.9 20.5 20.9 20.9 21.0 21.2 2015 — — 4.6 12.6 16.8 18.1 18.2 18.1 18.0 18.3 2016 — — — 5.3 10.4 13.2 14.3 14.7 15.0 15.3 2017 — — — — 3.9 10.2 14.4 15.5 15.9 17.3 2018 — — — — — 8.2 17.6 22.9 24.2 25.4 2019 — — — — — — 9.7 20.7 26.8 28.5 2020 — — — — — — — 18.6 20.6 23.5 2021 — — — — — — — — 4.4 7.2 2022 — — — — — — — — — 7.7 Total $ 190.6 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 80.2 Net reserves for loss and allocated loss adjustment expenses prior to 2013 2.5 Credit & Bond - net reserves for loss and allocated loss adjustment expenses, end of year $ 82.7 Marine & Energy Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 19.9 $ 17.8 $ 16.6 $ 15.8 $ 15.4 $ 15.4 $ 15.5 $ 15.6 $ 15.2 $ 14.9 $ 0.5 2014 — 21.7 20.3 18.7 17.4 16.9 17.6 17.5 17.5 17.4 (0.2) 2015 — — 26.7 28.6 26.5 26.0 25.8 26.3 26.2 26.2 — 2016 — — — 29.9 28.2 24.5 24.4 24.5 24.4 24.5 — 2017 — — — — 34.1 30.0 29.0 31.5 31.1 31.2 0.3 2018 — — — — — 18.8 20.3 20.3 20.0 20.3 0.9 2019 — — — — — — 18.5 18.9 19.1 19.2 0.6 2020 — — — — — — — 19.9 18.0 18.1 5.2 2021 — — — — — — — — 24.6 22.8 11.8 2022 — — — — — — — — — 22.5 17.0 Total $ 217.1 $ 36.1 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 2.5 $ 8.1 $ 10.9 $ 12.2 $ 12.4 $ 12.7 $ 12.9 $ 13.0 $ 13.0 $ 12.9 2014 — 3.8 9.8 13.2 14.5 15.0 15.1 16.1 16.1 16.1 2015 — — 3.0 10.0 19.5 23.6 24.6 25.2 25.3 25.3 2016 — — — 5.9 14.2 17.5 20.1 22.1 23.1 23.6 2017 — — — — 4.8 12.9 19.0 23.2 24.9 26.7 2018 — — — — — 2.8 8.7 14.3 15.0 15.9 2019 — — — — — — 2.5 7.3 10.2 11.6 2020 — — — — — — — 1.9 6.3 8.4 2021 — — — — — — — — 1.9 4.4 2022 — — — — — — — — — 2.7 Total $ 147.6 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 69.5 Net reserves for loss and allocated loss adjustment expenses prior to 2013 0.9 Marine & Energy - net reserves for loss and allocated loss adjustment expenses, end of year $ 70.4 Mortgage Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 0.3 $ 0.3 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ — 2014 — 3.6 0.7 0.7 0.6 0.6 0.6 0.6 0.6 0.5 — 2015 — — 1.7 1.7 1.6 1.6 0.8 0.8 0.8 0.8 — 2016 — — — 5.9 5.5 5.8 1.4 2.2 1.9 1.7 0.3 2017 — — — — 8.0 8.4 2.2 3.1 2.5 2.4 0.8 2018 — — — — — 11.2 4.3 5.5 4.9 4.3 2.1 2019 — — — — — — 7.0 8.7 8.0 6.9 4.1 2020 — — — — — — — 12.0 11.8 7.8 5.0 2021 — — — — — — — — 11.1 7.7 5.0 2022 — — — — — — — — — 8.8 6.3 Total $ 41.0 $ 23.6 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1 2014 — — 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 2015 — — 0.3 0.5 0.7 0.7 0.8 0.8 0.8 0.8 2016 — — — 0.1 0.5 0.8 1.0 1.0 1.0 1.0 2017 — — — — 0.1 0.7 1.0 1.1 1.0 1.2 2018 — — — — — 0.3 1.2 1.3 1.4 1.4 2019 — — — — — — 0.8 1.6 1.8 1.7 2020 — — — — — — — 1.4 1.5 1.3 2021 — — — — — — — — 1.1 1.1 2022 — — — — — — — — — 0.9 Total $ 10.1 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 30.9 Net reserves for loss and allocated loss adjustment expenses prior to 2013 — Mortgage - net reserves for loss and allocated loss adjustment expenses, end of year $ 30.9 Property Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 224.2 $ 247.2 $ 236.2 $ 233.0 $ 231.7 $ 231.4 $ 230.8 $ 231.2 $ 230.5 $ 230.1 $ 0.2 2014 — 198.3 203.0 201.3 205.5 205.8 205.5 205.2 205.5 205.5 (0.6) 2015 — — 210.8 208.2 212.3 212.8 211.5 211.5 211.6 211.2 (5.6) 2016 — — — 286.0 285.6 288.3 288.6 286.6 285.8 285.6 0.8 2017 — — — — 455.5 499.0 508.9 514.6 514.2 510.3 11.1 2018 — — — — — 452.8 510.1 516.9 510.0 502.4 16.6 2019 — — — — — — 515.1 500.8 500.2 483.8 27.1 2020 — — — — — — — 563.1 554.9 524.0 104.1 2021 — — — — — — — — 596.9 662.1 161.4 2022 — — — — — — — — — 334.7 171.4 Total $ 3,949.7 $ 486.5 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 55.4 $ 166.2 $ 204.4 $ 216.6 $ 220.9 $ 222.7 $ 224.3 $ 225.6 $ 225.6 $ 225.9 2014 — 49.1 136.5 170.8 187.3 193.5 197.4 198.3 199.2 199.5 2015 — — 52.5 144.2 177.1 192.8 201.0 203.3 205.3 205.8 2016 — — — 62.2 186.8 238.2 261.3 272.3 276.2 278.0 2017 — — — — 86.6 311.4 398.6 453.7 465.9 480.4 2018 — — — — — 67.9 312.8 406.6 437.9 457.9 2019 — — — — — — 67.5 291.6 380.4 414.5 2020 — — — — — — — 76.6 220.5 330.2 2021 — — — — — — — — 79.2 232.5 2022 — — — — — — — — — 45.0 Total $ 2,869.7 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 1,080.0 Net reserves for loss and allocated loss adjustment expenses prior to 2013 29.7 Property - net reserves for loss and allocated loss adjustment expenses, end of year $ 1,109.7 Insurance & Services The following tables provide a breakdown of the Company’s loss and allocated loss adjustment expenses incurred, net and net loss and allocated loss adjustment expenses paid by accident year by line of business for the Company’s Insurance & Services segment for the year ended December 31, 2022. The information related to loss and allocated loss adjustment expenses incurred, net and net loss and allocated loss adjustment expenses paid for the years ended December 31, 2013 through 2021 is presented as supplementary information and is unaudited: A&H Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 124.6 $ 122.2 $ 117.7 $ 117.2 $ 116.6 $ 115.8 $ 115.7 $ 115.5 $ 115.6 $ 115.5 $ — 2014 — 130.4 131.5 130.0 130.0 129.1 129.0 128.9 129.1 129.1 0.1 2015 — — 152.2 148.5 145.2 143.9 143.5 143.6 143.6 143.6 0.3 2016 — — — 172.3 172.0 167.9 166.4 166.2 165.8 165.9 2.3 2017 — — — — 176.5 172.6 166.0 163.8 163.6 163.9 (0.6) 2018 — — — — — 200.2 207.6 205.5 203.8 203.8 (1.6) 2019 — — — — — — 274.7 269.8 261.1 260.8 (1.5) 2020 — — — — — — — 311.3 305.4 282.8 13.7 2021 — — — — — — — — 223.1 216.3 21.2 2022 — — — — — — — — — 355.1 156.6 Total $ 2,036.8 $ 190.5 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ 54.1 $ 102.7 $ 113.1 $ 114.5 $ 115.8 $ 115.2 $ 115.2 $ 115.3 $ 115.3 $ 115.3 2014 59.1 110.9 124.3 126.0 126.0 126.7 126.8 126.8 126.8 2015 75.2 129.6 141.0 142.6 142.9 143.0 143.0 143.0 2016 97.6 149.3 160.9 162.8 163.3 163.0 163.1 2017 58.8 146.9 159.5 160.3 160.7 160.8 2018 90.6 187.5 204.2 205.4 205.8 2019 130.9 235.6 252.6 255.7 2020 107.0 246.1 273.2 2021 120.6 182.8 2022 169.7 Total $ 1,796.2 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 240.6 Net reserves for loss and allocated loss adjustment expenses prior to 2013 (0.4) A&H - net reserves for loss and allocated loss adjustment expenses, end of year $ 240.2 Environmental Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — — 2015 — — — — — — — — — — — 2016 — — — — — — — — — — — 2017 — — — — — — — — — — — 2018 — — — — — 0.4 0.1 0.1 0.1 0.1 — 2019 — — — — — — 4.5 4.6 2.7 2.8 0.9 2020 — — — — — — — 3.6 3.2 3.4 2.9 2021 — — — — — — — — 4.7 4.9 3.3 2022 — — — — — — — — — 11.8 11.4 Total $ 23.0 $ 18.5 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — 2015 — — — — — — — — — — 2016 — — — — — — — — — — 2017 — — — — — — — — — — 2018 — — — — — — — 0.1 0.1 0.1 2019 — — — — — — — 0.9 1.8 1.9 2020 — — — — — — — — 0.3 0.5 2021 — — — — — — — — — 0.8 2022 — — — — — — — — — — Total $ 3.3 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 19.7 Net reserves for loss and allocated loss adjustment expenses prior to 2013 — Environmental - net reserves for loss and allocated loss adjustment expenses, end of year $ 19.7 Workers’ Compensation Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — — 2015 — — — — — — — — — — — 2016 — — — — — — — — — — — 2017 — — — — — — — — — — — 2018 — — — — — 1.5 1.5 1.1 1.2 0.6 0.2 2019 — — — — — — 18.6 16.6 15.7 15.7 1.3 2020 — — — — — — — 45.8 46.9 47.6 2.8 2021 — — — — — — — — 94.9 119.1 34.2 2022 — — — — — — — — — 97.7 67.9 Total $ 280.7 $ 106.4 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — 2015 — — — — — — — — — — 2016 — — — — — — — — — — 2017 — — — — — — — — — — 2018 — — — — — — 0.2 0.3 0.4 0.5 2019 — — — — — — 1.3 6.8 10.0 12.6 2020 — — — — — — — 4.2 19.7 29.1 2021 — — — — — — — — 10.4 43.9 2022 — — — — — — — — — 8.5 Total $ 94.6 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 186.1 Net reserves for loss and allocated loss adjustment expenses prior to 2013 — Workers’ Compensation - net reserves for loss and allocated loss adjustment expenses, end of year $ 186.1 Other Loss and allocated loss adjustment expenses incurred, net Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 IBNR loss and ALAE reserves, net <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — — 2015 — — — — — — — — — — — 2016 — — — — — — — — — — — 2017 — — — — — — — — — — — 2018 — — — — — — — — — — — 2019 — — — — — — — — — — — 2020 — — — — — — — 2.6 2.2 2.2 1.1 2021 — — — — — — — — 61.7 62.1 42.8 2022 — — — — — — — — — 238.2 213.3 Total $ 302.5 $ 257.2 Cumulative net losses and allocated loss adjustment expenses paid Accident year 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <--------------------------------------------------- Unaudited ---------------------------------------------------> 2013 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — 2014 — — — — — — — — — — 2015 — — — — — — — — — — 2016 — — — — — — — — — — 2017 — — — — — — — — — — 2018 — — — — — — — — — — 2019 — — — — — — — — — — 2020 — — — — — — — 0.4 0.8 0.9 2021 — — — — — — — — 1.4 12.5 2022 — — — — — — — — — 15.6 Total $ 29.0 Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022 273.5 Net reserves for loss and allocated loss adjustment expenses prior to 2013 2.0 Other - net reserves for loss and allocated loss adjustment expenses, end of year $ 275.5
Reconciliation of loss and loss expense reserves	The following table provides a reconciliation of the Company's loss and loss adjustment expense reserves as of December 31, 2022: 2022 Net reserves for loss and allocated loss adjustment expenses Reinsurance Aviation & Space $ 176.5 Casualty 1,334.8 Contingency 9.5 Credit & Bond 82.7 Marine & Energy 70.4 Mortgage 30.9 Property 1,109.7 Insurance & Services A&H 240.2 Environmental 19.7 Workers’ Compensation 186.1 Other 275.5 Corporate (1) 239.9 Net reserves for loss and allocated loss adjustment expenses, end of year 3,775.9 Loss and allocated loss adjustment expenses recoverable Reinsurance Aviation & Space 60.0 Casualty 9.1 Contingency 2.6 Credit & Bond 7.5 Marine & Energy 9.3 Mortgage 1.9 Property 527.3 Insurance & Services A&H 72.5 Environmental 7.6 Workers’ Compensation 121.4 Other 129.6 Corporate 427.4 Total loss and allocated loss adjustment expenses recoverable 1,376.2 Unallocated loss adjustment expense reserves 62.0 Other items, net (2) 53.6 Deferred charges on retroactive reinsurance contracts 1.0 Gross reserves for loss and loss adjustment expenses, end of year $ 5,268.7 (1) Corporate includes the results of all runoff business and is not presented in the loss development tables. (2) Includes fair value adjustments associated with the acquisition of Sirius Group.
Schedule of historical average annual percentage payout on loss adjustment expenses incurred, net by age	The following table is presented as supplementary information and presents the Company’s historical average annual percentage payout of loss and loss adjustment expenses incurred, net by age, as of December 31, 2022: Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 (Unaudited) Reinsurance Aviation & Space 19.1 % 23.2 % 15.3 % 8.3 % 6.4 % 2.7 % 3.4 % 0.2 % 2.4 % — % Casualty 16.3 % 20.8 % 13.0 % 10.2 % 5.8 % 3.5 % 2.1 % 1.0 % 0.7 % (0.2) % Contingency 30.3 % 26.3 % 51.8 % 13.9 % 3.6 % 1.6 % 0.1 % (1.4) % — % (19.1) % Credit & Bond 29.9 % 25.1 % 15.5 % 5.6 % 2.5 % 2.0 % 0.4 % 0.5 % 1.0 % 6.2 % Marine & Energy 14.7 % 26.9 % 20.9 % 10.1 % 4.8 % 3.2 % 2.2 % 0.1 % 0.2 % (0.2) % Mortgage 12.6 % 11.0 % 3.7 % 1.9 % 0.8 % 1.5 % 0.4 % (0.3) % (0.2) % — % Property 16.3 % 38.9 % 18.2 % 7.7 % 3.2 % 1.8 % 0.7 % 0.4 % 0.1 % 0.2 % Insurance & Services A&H 47.3 % 41.5 % 8.2 % 1.0 % 0.3 % — % — % — % — % — % Environmental 0.7 % 17.9 % 17.1 % 3.7 % 4.4 % — % — % — % — % — % Workers’ Compensation 8.7 % 29.9 % 19.9 % 16.4 % 11.7 % — % — % — % — % — % Other 5.8 % 17.8 % 7.2 % 8.3 % — % — % — % — % — % — %

Financial Services, Insurance (

Financial Services, Insurance (Tables)	12 Months Ended
	Dec. 31, 2022
Insurance [Abstract]
Schedule of premiums net premiums written and earned	The following tables provide a breakdown of the Company’s written and earned premiu ms and loss and loss adjustment expenses from direct business, reinsurance assumed and reinsurance ceded for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Written premiums: Direct $ 1,403.9 $ 718.0 $ 19.0 Assumed 2,005.8 1,518.5 569.5 Gross premiums written 3,409.7 2,236.5 588.5 Ceded (860.5) (502.3) (46.3) Net premiums written $ 2,549.2 $ 1,734.2 $ 542.2 2022 2021 2020 Premiums earned: Direct $ 1,153.6 $ 600.8 $ 1.0 Assumed 1,915.2 1,598.5 638.8 Gross premiums earned 3,068.8 2,199.3 639.8 Ceded (750.7) (482.3) (29.0) Net premiums earned $ 2,318.1 $ 1,717.0 $ 610.8 2022 2021 2020 Loss and loss adjustment expense: Direct $ 778.0 $ 349.3 $ 0.8 Assumed 1,386.8 1,506.1 483.2 Loss and loss adjustment expense incurred 2,164.8 1,855.4 484.0 Ceded (576.4) (528.9) (18.7) Loss and loss adjustment expense incurred, net $ 1,588.4 $ 1,326.5 $ 465.3
Schedule of ceded credit risk	The following tables provide a listing of the Company’s loss and loss adjustment expenses recoverable by the reinsurer's S&P rating and the percentage of total recoverables as of December 31, 2022 and 2021. With certain reinsurers, if S&P's rating was not available, an equivalent AM Best rating was used. December 31, 2022 Rating (1) (2) Gross Collateral Net % of Net AA $ 252.8 $ 41.2 $ 211.6 29.5 % A 370.6 48.5 322.1 44.9 % BBB or lower 246.7 104.8 141.9 19.8 % Not rated 506.1 464.2 41.9 5.8 % Total $ 1,376.2 $ 658.7 $ 717.5 100.0 % December 31, 2021 Rating (1) (2) Gross Collateral Net % of Net AA $ 149.5 $ 1.7 147.8 22.6 % A 360.8 16.0 344.8 52.6 % BBB or lower 212.3 130.5 81.8 12.5 % Not rated 492.7 412.0 80.7 12.3 % Total $ 1,215.3 $ 560.2 $ 655.1 100.0 % (1) S&P’s ratings as detailed above are: "AAA" (Extremely Strong), "AA" (Very strong), "A" (Strong) and "BBB" (Adequate). (2) Not rated represents reinsurers who are not rated by either S&P or AM. Best. Included in the “Not rated” category as of December 31, 2022 is $327.7 million (2021 - $355.9 million) related to Pallas Reinsurance Ltd. as a result of the 2021 LPT, and the amount is fully collateralized. The following tables provide a listing of the five highest loss and loss adjustment expenses recoverable by reinsurer, along with percentage of total recoverable amount, the reinsurer's S&P reinsurer rating and the percentage that the recoverable is collateralized as of December 31, 2022 and 2021: December 31, 2022 Balance % of Total S&P rating % Collateralized Reinsurer: Pallas Reinsurance Company Ltd. $ 327.7 23.8 % Not rated 100.0 % General Insurance Corporation of India 184.9 13.4 % BBB 31.3 % Arch Reinsurance Ltd 79.6 5.8 % A+ 1.3 % Swiss Reinsurance Company Ltd 68.6 5.0 % AA- 25.8 % Pie Casualty Insurance Company $ 44.1 3.2 % Not rated 100.0 % December 31, 2021 Balance % of Total S&P rating % Collateralized Reinsurer: Pallas Reinsurance Company Ltd. $ 355.9 29.3 % Not rated 100.0 % General Insurance Corporation of India (1) 140.9 11.6 % BBB 89.4 % Swiss Reinsurance Company, Ltd. 34.8 2.9 % AA- 13.4 % Argo Capital Group Ltd. 28.6 2.4 % Not rated 100.0 % Lloyd’s of London $ 27.4 2.3 % A+ 51.8 % (1) Reflects an AM Best rating o f "B++" (Good).

Allowance for expected credit_2

Allowance for expected credit losses (Tables)	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Schedule of assets in scope of the current expected credit losses assessment	The Company's assets in scope of the current expected credit loss assessment as of December 31, 2022 and December 31, 2021 are as follows: December 31, December 31, 2021 Insurance and reinsurance balances receivable, net (1) $ 1,876.9 $ 1,708.2 Loss and loss adjustment expenses recoverable, net 1,376.2 1,215.3 Other assets (2) 52.4 14.5 Total assets in scope $ 3,305.5 $ 2,938.0 (1) As of December 31, 2022, one counterparty’s insurance and reinsurance balances receivable of $236.5 million exceeded 10% of the Company’s total insurance and reinsurance balances receivable (December 31, 2021 - no counterparties exceeded 10%).

Debt and letter of credit fac_2

Debt and letter of credit facilities (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of debt obligations	The following table represents a summar y of the Company’s debt obl igations on its consolidated balance sheets as of December 31, 2022 and December 31, 2021: December 31, 2022 December 31, 2021 Amount Effective rate (1) Amount Effective rate (1) 2017 SEK Subordinated Notes, at face value $ 264.3 6.0 % $ 303.1 4.1 % Unamortized discount (5.7) (6.8) 2017 SEK Subordinated Notes, carrying value 258.6 296.3 2016 Senior Notes, at face value 400.0 4.5 % 400.0 4.5 % Unamortized premium 4.8 6.0 2016 Senior Notes, carrying value 404.8 406.0 2015 Senior Notes, at face value 115.0 7.0 % 115.0 7.0 % Unamortized issuance costs (0.4) (0.6) 2015 Senior Notes, carrying value 114.6 114.4 Total debt $ 778.0 $ 816.7 (1) Effective rate considers the effect of the debt issuance costs, discount, and premium.
Schedule of letter of credit facilities	As of December 31, 2022, the Company had entered into the following letter of credit facilities: Letters of Credit Collateral Committed Capacity Issued Cash and Cash Equivalents Debt securities Committed - Secured letters of credit facilities $ 380.0 $ 288.0 $ 15.8 $ 205.9 Uncommitted - Secured letters of credit facilities n/a 982.4 18.5 1,188.5 $ 1,270.4 $ 34.3 $ 1,394.4

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of income before income tax by jurisdiction	The following is a summary of the Company’s income (loss) before income tax (expense) benefit by jurisdiction for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Bermuda $ (151.7) $ 178.5 $ 113.6 U.S. (47.0) 21.8 38.1 U.K. (9.7) 1.9 0.2 Sweden (174.6) (138.1) — Luxembourg (37.2) (20.5) — Other (2.5) 1.5 — Income (loss) before income tax (expense) benefit $ (422.7) $ 45.1 $ 151.9
Schedule of components of income tax expense	For the years ended December 31, 2022, 2021 and 2020, income tax (expense) benefit consisted of the following: 2022 2021 2020 Current tax (expense) benefit: U.S. Federal $ 1.6 $ (3.5) $ (0.1) State (0.9) (1.8) — Non-U.S. (3.2) (18.2) — Total current tax (expense) benefit (2.5) (23.5) (0.1) Deferred tax (expense) benefit: U.S. Federal 20.7 (13.1) (8.0) State 2.0 (4.8) — Non-U.S. 16.5 52.1 — Total deferred tax (expense) benefit 39.2 34.2 (8.0) Total income tax (expense) benefit $ 36.7 $ 10.7 $ (8.1)
Schedule of effective rate reconciliation	The following table presents a reconciliation of expected income taxes to income tax (expense) benefit for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Tax (expense) benefit at the 0% Bermuda statutory rate $ — $ — $ — Differences in taxes resulting from: Non-Bermuda earnings 52.9 17.6 (8.0) Change in valuation allowance (14.3) 10.5 — Foreign currency effects (10.7) (19.0) — Change in uncertain tax positions 8.0 (8.0) (0.1) Provision-to-return true up 3.9 (0.5) — Tax rate change 2.7 4.3 — Tax on Safety Reserve (2.4) (1.0) — Non-taxable/deductible income (1.4) 7.2 — Other, net (1.3) 0.5 — State taxes expense (0.7) (0.9) — Total income tax (expense) benefit $ 36.7 $ 10.7 $ (8.1)
Schedule of deferred tax assets and liabilities	The following table presents the tax effects of temporary differences that give rise to the deferred tax assets and deferred tax liabilities as of December 31, 2022 and 2021: December 31, December 31, 2021 Deferred tax assets: Non-U.S. net operating loss carryforwards $ 301.1 $ 273.3 Unearned premiums 22.1 13.4 U.S. federal net operating loss and capital carryforwards 17.8 19.4 Purchase accounting 16.9 17.8 Tax credit carryforwards 16.0 26.2 Investment basis differences 10.7 5.9 Discounting of loss and loss adjustment expense reserves 9.3 7.6 Unrealized losses on investments 9.0 — Incentive compensation and benefit accruals 5.8 5.7 Deferred interest 4.3 3.9 Allowance for doubtful accounts 4.0 2.9 Other items 4.0 5.2 Total gross deferred tax assets 421.0 381.3 Valuation allowance (114.3) (113.3) Total adjusted deferred tax asset $ 306.7 $ 268.0 Deferred tax liabilities: Safety reserve $ 126.5 $ 150.1 Deferred acquisition costs 22.5 6.7 Intangible assets 13.4 14.3 Foreign currency translation on investments 0.9 1.7 Unrealized gains on investments — 3.8 Other Items 2.9 4.8 Total deferred tax liabilities 166.2 181.4 Net deferred tax assets $ 140.5 $ 86.6
Schedule of operating loss and capital loss carryforwards	Net operating loss and capital loss carryforwards as of December 31, 2022, the expiration dates and the deferred tax assets thereon are as follows: December 31, 2022 United States Luxembourg Sweden U.K. Total 2023-2027 $ 3.0 $ — $ — $ — $ 3.0 2028-2042 63.0 74.8 — — 137.8 No expiration date 21.1 723.6 312.1 150.3 1,207.1 Total 87.1 798.4 312.1 150.3 1,347.9 Gross deferred tax asset 18.0 199.1 64.3 37.6 319.0 Valuation allowance — (69.4) — (37.6) (107.0) Net deferred tax asset $ 18.0 $ 129.7 $ 64.3 $ — $ 212.0
Reconciliation of unrecognized tax benefits	The following table is a reconciliation of the beginning and ending unrecognized tax benefits for the years ended December 31, 2022 and 2021: Permanent differences (1) Temporary differences (2) Interest and penalties (3) Total Balance as of January 1, 2021 $ 1.1 $ — $ 0.5 $ 1.6 Acquisition of Sirius Group 0.7 0.1 0.1 0.9 Changes in prior year tax positions (0.1) (0.1) 0.1 (0.1) Tax positions taken during the current year 8.0 0.3 — 8.3 Balance as of December 31, 2021 9.7 0.3 0.7 10.7 Changes in prior year tax positions (8.0) (0.3) — (8.3) Lapse in statute of limitations (0.1) — — (0.1) Balance as of December 31, 2022 $ 1.6 $ — $ 0.7 $ 2.3 (1) Represents the amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate. (2) Represents the amount of unrecognized tax benefits that, if recognized, would create a temporary difference between the reported amount of an item in the consolidated balance sheets and its tax basis. (3) Net of tax benefit.

Shareholders' equity (Tables)

Shareholders' equity (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Schedule of common shares issued and outstanding	The following table presents a summary of the common shares issued and outstanding as of and for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Common shares issued and outstanding, beginning of year 161,929,777 95,582,733 94,225,498 Issuance of common shares, net of forfeitures and shares withheld 942,923 3,133,969 1,012,939 Shares repurchased (695,047) — — Options exercised — 220,000 — Performance restricted shares granted, net of forfeitures and shares withheld — (1,431,963) 344,296 Issuance of common shares for Sirius Group acquisition — 58,331,196 — Issuance of common shares to related party — 6,093,842 — Common shares issued and outstanding, end of year 162,177,653 161,929,777 95,582,733

Share-based compensation and _2

Share-based compensation and employee benefit plans (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Schedule of RSU activity	RSU activity for the year ended December 31, 2022 was as follows: Number of non- Weighted Balance as of January 1, 2022 3,428,888 $ 10.14 Granted 4,928,981 6.53 Forfeited (1,214,252) 5.89 Vested (1,982,204) 9.85 Balance as of December 31, 2022 5,161,413 $ 7.29
Schedule of restricted share award activity	Restricted share award activity for the year ended December 31, 2022 was as follows: Number of non- Weighted Balance as of January 1, 2022 2,590,194 $ 10.13 Granted 237,118 6.01 Forfeited (292,989) 8.80 Vested (825,715) 10.22 Balance as of December 31, 2022 1,708,608 $ 7.40
Schedule of performance share units	PSU activity for the year ended December 31, 2022 was as follows: Number of non- Number of non- Weighted average grant date fair value of PSUs probable of vesting Balance as of January 1, 2022 1,085,294 1,085,294 $ 10.30 Granted — — — Forfeited (495,502) (495,502) 10.33 Vested (13,114) (13,114) 10.36 Balance as of December 31, 2022 576,678 576,678 $ 9.85
Schedule of valuation assumptions for options	The Black-Scholes option-pricing model used the following assumptions for options granted during the year ended December 31, 2022 and December 31, 2021 (there were no options granted for the year ended December 31, 2020): 2022 2021 Dividend yield — % — % Risk free interest rate 3.57 % 1.55 % Expected volatility (1) 32.30 % 34.17 % Expected life (in years) 6.3 6.5 Weighted average grant date fair value $1.93 $3.28
Schedule of options activity	The options activity for the years ended December 31, 2022 were as follows: Number of Weighted Outstanding as of January 1, 2022 7,087,095 $ 12.61 Granted 2,905,709 6.94 Forfeited and expired (4,650,065) 12.92 Exercised — — Outstanding as of December 31, 2022 5,342,739 9.25 Exercisable as of December 31, 2022 2,781,527 $ 11.01

Earnings (loss) per share ava_2

Earnings (loss) per share available to SiriusPoint common shareholders (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Computation of basic and diluted earnings (loss) per share available to SiriusPoint common shareholders	The following sets forth the computation of basic and diluted earnings (loss) per share available to SiriusPoint common shareholders for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Weighted-average number of common shares outstanding: ($ in millions, except share and per share amounts) Basic number of common shares outstanding 160,228,588 148,667,770 92,510,090 Dilutive effect of options — — — Dilutive effect of warrants — — — Dilutive effect of restricted share units — 1,488,696 447,709 Diluted number of common shares outstanding 160,228,588 150,156,466 92,957,799 Basic earnings (loss) per common share: Net income (loss) available to SiriusPoint common shareholders $ (402.8) $ 44.6 $ 143.5 Net income allocated to SiriusPoint participating common shareholders — (3.4) (1.1) Net income (loss) allocated to SiriusPoint common shareholders $ (402.8) $ 41.2 $ 142.4 Basic earnings (loss) per share available to SiriusPoint common shareholders $ (2.51) $ 0.28 $ 1.54 Diluted earnings (loss) per common share: Net income (loss) available to SiriusPoint common shareholders $ (402.8) $ 44.6 $ 143.5 Net income allocated to SiriusPoint participating common shareholders — (3.4) (1.1) Net income (loss) allocated to SiriusPoint common shareholders $ (402.8) $ 41.2 $ 142.4 Diluted earnings (loss) per share available to SiriusPoint common shareholders $ (2.51) $ 0.27 $ 1.53

Related party transactions (Tab

Related party transactions (Tables)	12 Months Ended
	Dec. 31, 2022
Related Party Transactions [Abstract]
Schedule of related party transactions	The following table provides the fair value of the Company's investments managed by related parties as of December 31, 2022 and December 31, 2021: December 31, 2022 December 31, 2021 Third Point Enhanced LP $ 100.3 $ 878.2 Third Point Venture Offshore Fund I LP 26.0 31.4 Third Point Venture Offshore Fund II LP 2.5 — Investments in related party investment funds, at fair value 128.8 909.6 Third Point Optimized Credit Portfolio (1)(2) 530.7 — Total investments managed by related parties $ 659.5 $ 909.6 (1) The Third Point Optimized Credit Portfolio is reported in debt securities available for sale and trading in the consolidated balance sheets. (2) Includes $59.9 million of asset-backed securities withdrawn as a redemption in-kind from the TP Enhanced Fund. The total management, advisory and performance fees to related parties for the years ended December 31, 2022, 2021 and 2020 were as follows: 2022 2021 2020 Management and advisory fees $ 7.3 $ 17.9 $ 14.5 Performance fees - fixed income and other investments (1) — — 14.0 Performance fees (before loss carryforward) (1.2) 75.7 51.8 Performance fees - loss carryforward utilized — — (0.5) Total management and performance fees to related parties (2) $ 6.1 $ 93.6 $ 79.8 (1) Pursuant to the terms of the 2020 LPA, the performance of certain fixed income and other investments managed by Third Point LLC were subject to 20% performance fees for the year ended December 31, 2020 only. (2) Management, advisory and performance fees for the Related Party Investment Funds, where applicable, are presented within net realized and unrealized investment gains from related party investment funds in the consolidated statements of income (loss)

Commitment and contingencies (T

Commitment and contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Schedules of concentration risk by risk factor	The following table sets forth the Company’s premiums written by source that individually contributed more than 10% of total gross premiums written for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Aon Corporation and subsidiaries $ 625.5 18.3 % $ 536.6 24.0 % $ 189.1 32.1 % Guy Carpenter & Company and subsidiaries 441.9 13.0 % 414.1 18.5 % 164.6 28.0 % Arthur J. Gallagher & Co. and subsidiaries 216.8 6.4 % 244.2 10.9 % 67.6 11.5 % Other 2,125.5 62.3 % 1,041.6 46.6 % 167.2 28.4 % $ 3,409.7 100.0 % $ 2,236.5 100.0 % $ 588.5 100.0 %
Schedule of lease balances	The following table presents the lease balances within the consolidated balance sheets as of December 31, 2022 and 2021: December 31, December 31, 2021 Operating lease right-of-use assets $ 25.9 $ 27.4 Operating lease liabilities $ 30.3 $ 32.5 Weighted average lease term (years) 5.5 5.0 Weighted average discount rate 3.1 % 2.4 %
Schedule of future minimum rental commitments	Future minimum rental commitments as of December 31, 2022 under these leases are expected to be as follows: Future Payments 2023 $ 9.2 2024 5.9 2025 4.6 2026 3.7 2027 and thereafter 9.7 Total future annual minimum rental payments 33.1 Less: present value discount (2.8) Total lease liability as of December 31, 2022 $ 30.3

Statutory requirements (Tables)

Statutory requirements (Tables)	12 Months Ended
	Dec. 31, 2022
Insurance [Abstract]
Schedule of statutory information	The following is a summary of available and required statutory economic capital and surplus of the Bermuda based insurance subsidiaries as of December 31, 2021: December 31, 2021 Available statutory economic capital and surplus SiriusPoint Ltd. $ 3,119.1 SiriusPoint Bermuda 3,333.5 Alstead Re 4.6 Required statutory economic capital and surplus SiriusPoint Ltd. 1,558.3 SiriusPoint Bermuda 1,531.6 Alstead Re $ 1.6 The following is a summary of the statutory net income (loss) for the Bermuda based insurance subsidiaries for the years ended December 31, 2022 and 2021: 2022 2021 SiriusPoint Bermuda $ (360.1) $ 90.6 Alstead Re $ 0.9 $ (0.4) The following is a summary of estimated actual and required statutory capital and surplus of the U.S. based insurance and reinsurance subsidiaries as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Actual statutory capital and surplus SiriusPoint America $ 508.8 $ 581.5 SiriusPoint Specialty 57.0 55.2 Oakwood 39.4 39.7 Required statutory capital and surplus (1) SiriusPoint America 152.2 112.4 SiriusPoint Specialty 46.0 47.0 Oakwood $ 7.5 $ 7.5 (1) Equals the authorized control level of the NAIC risk-based capital. The following is a summary of the statutory net income (loss) for the U.S. based insurance and reinsurance subsidiaries for the years ended December 31, 2022 and 2021: 2022 2021 SiriusPoint America $ (56.2) $ 28.9 SiriusPoint Specialty (8.1) (7.1) Oakwood $ (0.2) $ (0.4)

Significant accounting polici_4

Significant accounting policies - Summary of the retrospective impact of change in accounting policy (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed consolidated statements of income
Gross premiums written	$ 3,409.7	$ 2,236.5	$ 588.5
Gross premiums ceded	(860.5)	(502.3)	(46.3)
Net premiums written	2,549.2	1,734.2	542.2
Change in net unearned premium reserves			68.6
Net premiums earned	2,318.1	1,717	610.8
Net income (loss) available to SiriusPoint common shareholders	(402.8)	44.6	143.5
Net income (loss) available to SiriusPoint common shareholders	(402.8)	44.6	143.5
Condensed consolidated statement of cash flows
Insurance and reinsurance balances receivable, net	(164.7)	(48.3)	38.6
Deferred acquisition costs and value of business acquired, net	(76.1)	(2.3)	23.6
Unearned premiums ceded	(106)	(33.3)	(17.3)
Unearned premium reserves	322.7	13.6	(51.3)
Reinsurance balances payable	125.3	223	1.8
Net cash provided by operating activities	$ 293.3	$ 1.6	73.3
As previously reported
Condensed consolidated statements of income
Gross premiums written			588
Gross premiums ceded			(39.7)
Net premiums written			548.3
Change in net unearned premium reserves			62.5
Net premiums earned			610.8
Net income (loss) available to SiriusPoint common shareholders			143.5
Net income (loss) available to SiriusPoint common shareholders			143.5
Condensed consolidated statement of cash flows
Insurance and reinsurance balances receivable, net			38.8
Deferred acquisition costs and value of business acquired, net			20.4
Unearned premiums ceded			(10.7)
Unearned premium reserves			(51.8)
Reinsurance balances payable			(1.3)
Net cash provided by operating activities			73.3
Adjustment
Condensed consolidated statements of income
Gross premiums written			0.5
Gross premiums ceded			(6.6)
Net premiums written			(6.1)
Change in net unearned premium reserves			6.1
Net premiums earned			0
Net income (loss) available to SiriusPoint common shareholders			0
Net income (loss) available to SiriusPoint common shareholders			0
Condensed consolidated statement of cash flows
Insurance and reinsurance balances receivable, net			(0.2)
Deferred acquisition costs and value of business acquired, net			3.2
Unearned premiums ceded			(6.6)
Unearned premium reserves			0.5
Reinsurance balances payable			3.1
Net cash provided by operating activities			$ 0

Significant accounting polici_5

Significant accounting policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
VOBA carrying value	$ 0	$ 50
Premium deficiency	0
Unrealized foreign currency translation losses	$ 5	$ 0.2	$ 0
Number of operating segments | segment	2

Acquisition of Sirius Group - N

Acquisition of Sirius Group - Narrative (Details) - USD ($)			12 Months Ended
	Feb. 26, 2021	Aug. 06, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 25, 2021
Business Acquisition [Line Items]
Common shares, par value (in dollars per share)			$ 0.10
Dividends paid to preference shareholders			$ 16,000,000	$ 12,200,000	$ 0
Fair value of liability-classified capital instruments			60,400,000	87,800,000
VOBA carrying value			0	50,000,000
Amortization of VOBA			50,000,000	$ 97,900,000
Series A preference shares
Business Acquisition [Line Items]
Fair value of liability-classified capital instruments			1,800,000
Series A preference shares | Liability-classified capital instruments
Business Acquisition [Line Items]
Gains (losses) from the change in fair value			18,600,000
Merger warrants
Business Acquisition [Line Items]
Fair value of liability-classified capital instruments			14,700,000
Merger warrants | Liability-classified capital instruments
Business Acquisition [Line Items]
Gains (losses) from the change in fair value			17,800,000
Private warrants
Business Acquisition [Line Items]
Fair value of liability-classified capital instruments			4,900,000
Private warrants | Liability-classified capital instruments
Business Acquisition [Line Items]
Gains (losses) from the change in fair value			(1,700,000)
Public warrants
Business Acquisition [Line Items]
Fair value of liability-classified capital instruments			0
Public warrants | Liability-classified capital instruments
Business Acquisition [Line Items]
Gains (losses) from the change in fair value			1,100,000
CVRs
Business Acquisition [Line Items]
Fair value of liability-classified capital instruments			39,000,000
CVRs | Liability-classified capital instruments
Business Acquisition [Line Items]
Gains (losses) from the change in fair value			(8,400,000)
Affiliated entity
Business Acquisition [Line Items]
Consideration received	$ 48,600,000
Maximum percentage of shares committed to purchase		9.50%
Sirius Group
Business Acquisition [Line Items]
Cash consideration	100,400,000
Loss and loss adjustment expense reserves, fair value adjustment	80,600,000
Loss and loss adjustment expense reserves, casualty liability adjustment	70,000,000
VOBA recognized as a result of the acquisition	147,900,000
Finite lived intangible assets recognized	130,000,000
Indefinite lived intangible assets recognized	$ 48,800,000
Sirius Group | Common shares
Business Acquisition [Line Items]
Shares issued (in shares)	58,331,196
Value of shares issued	$ 595,600,000
Sirius Group | CVRs
Business Acquisition [Line Items]
Value of shares issued	$ 27,000,000
Sirius Group | Series A preference shares
Business Acquisition [Line Items]
Shares issued (in shares)	11,720,987
Value of shares issued	$ 40,800,000
Par value (in dollars per share)	$ 0.10
Dividends paid to preference shareholders			$ 0
Sirius Group | Merger warrants
Business Acquisition [Line Items]
Value of shares issued	$ 53,400,000
Number of shares in which the warrants can be converted (in shares)			21,009,324
Sirius Group | Private warrants
Business Acquisition [Line Items]
Value of shares issued	$ 7,300,000
Sirius Group | Consideration Option One
Business Acquisition [Line Items]
Cash paid per acquiree share (in dollars per share)	$ 9.50
Sirius Group | Consideration Option Two
Business Acquisition [Line Items]
Common shares, par value (in dollars per share)	$ 0.10
Sirius Group | Consideration Option Two | Common shares
Business Acquisition [Line Items]
Entity shares issued per acquiree share (in shares)	0.743
Sirius Group | Consideration Option Two | CVRs
Business Acquisition [Line Items]
Entity shares issued per acquiree share (in shares)	1
Contingent cash payment per share contributor (in dollars per share)	$ 13.73
Contingent cash payment, threshold share price (in dollars per share)	$ 18.50
Settlement calculation, number of consecutive trading days	14 days
Shares issued (in shares)	4,700,000
Sirius Group | Consideration Option Three
Business Acquisition [Line Items]
Cash paid per acquiree share (in dollars per share)	$ 0.905
Entity principal amount of shares issued per acquiree share	$ 0.905
Sirius Group | Consideration Option Three | Common shares
Business Acquisition [Line Items]
Entity shares issued per acquiree share (in shares)	0.496
Sirius Group | Consideration Option Three | Series A preference shares
Business Acquisition [Line Items]
Entity shares issued per acquiree share (in shares)	0.106
Preference shares, par value (in dollars per share)	$ 0.10
Sirius Group | Consideration Option Three | Merger warrants
Business Acquisition [Line Items]
Entity shares issued per acquiree share (in shares)	0.190
Sirius Group
Business Acquisition [Line Items]
Common shares, par value (in dollars per share)						$ 0.01
Sirius Group | Public warrants
Business Acquisition [Line Items]
Warrant exercise price (in dollars per share)	$ 18.89

Acquisition of Sirius Group - P

Acquisition of Sirius Group - Purchase price calculation (Details) - Sirius Group $ / shares in Units, $ in Millions	Feb. 26, 2021 USD ($) $ / shares shares
Business Acquisition [Line Items]
Sirius Group shares acquired for cash	$ 100.4
Fair value of the replaced Sirius Group equity awards attributable to pre-combination services	37.5
Transaction fee reimbursement	8
Total purchase price	$ 1,079.8
Common shares
Business Acquisition [Line Items]
Common Shares issued by SiriusPoint (in shares) | shares	58,331,196
SiriusPoint share price as of February 26, 2021 (in dollars per share) | $ / shares	$ 10.21
Equity interests issued	$ 595.6
Series A preference shares
Business Acquisition [Line Items]
Common Shares issued by SiriusPoint (in shares) | shares	11,720,987
Equity interests issued	$ 40.8
Series B preference shares
Business Acquisition [Line Items]
Equity interests issued	200
Merger warrants
Business Acquisition [Line Items]
Equity interests issued	53.4
Private warrants
Business Acquisition [Line Items]
Equity interests issued	7.3
Public warrants
Business Acquisition [Line Items]
Equity interests issued	2.6
Upside rights
Business Acquisition [Line Items]
Equity interests issued	6.5
CVRs
Business Acquisition [Line Items]
Equity interests issued	27
CVR waiver restricted shares
Business Acquisition [Line Items]
Equity interests issued	$ 0.7

Acquisition of Sirius Group - F

Acquisition of Sirius Group - Fair value of net assets acquired and liabilities assumed (Details) $ in Millions	Feb. 26, 2021 USD ($)
Business Acquisition [Line Items]
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other revenues
Sirius Group
Business Acquisition [Line Items]
Cash and investments	$ 3,944.1
Insurance and reinsurance balances receivable, net	1,201
Reinsurance assets	649.7
Value of business acquired	147.9
Deferred tax asset	228
Intangible assets	178.8
Other assets	181.9
Loss and loss adjustment expense reserves	(2,928.5)
Unearned premium reserves	(900)
Deferred tax liability	(186.8)
Debt	(728.2)
Other liabilities	(657.7)
Total identifiable net assets acquired	1,130.2
Total purchase price	1,079.8
Bargain purchase gain	$ 50.4

Acquisition of Sirius Group - I

Acquisition of Sirius Group - Identifiable intangible assets (Details) - USD ($) $ in Millions			12 Months Ended
	Aug. 05, 2021	Feb. 26, 2021	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Finite lived intangible assets net balance			$ 116
Identifiable intangible assets net balance			163.8	$ 171.9
Intangible asset impairments			0
Sirius Group
Business Acquisition [Line Items]
Identifiable intangible assets gross balance		$ 178.8
Accumulated amortization			(14)	(5.9)
Identifiable intangible assets net balance			164.8	172.9
Sirius Group | Lloyd’s Capacity - Syndicate 1945
Business Acquisition [Line Items]
Indefinite lived intangible assets net balance		41.8	41.8	41.8
Sirius Group | Insurance licenses
Business Acquisition [Line Items]
Indefinite lived intangible assets net balance		$ 7	7	7
Insurance licenses sold	$ (1)
Sirius Group | Distribution relationships
Business Acquisition [Line Items]
Economic Useful Life		17 years
Finite lived intangible assets gross balance		$ 75
Accumulated amortization			(1.9)	0
Finite lived intangible assets net balance			73.1	75
Sirius Group | MGA relationships
Business Acquisition [Line Items]
Economic Useful Life		13 years
Finite lived intangible assets gross balance		$ 34
Accumulated amortization			(9.4)	(4.9)
Finite lived intangible assets net balance			24.6	29.1
Sirius Group | Trade name
Business Acquisition [Line Items]
Economic Useful Life		16 years
Finite lived intangible assets gross balance		$ 16
Accumulated amortization			(0.8)	(0.2)
Finite lived intangible assets net balance			15.2	15.8
Sirius Group | Internally developed computer software
Business Acquisition [Line Items]
Economic Useful Life		5 years
Finite lived intangible assets gross balance		$ 5
Accumulated amortization			(1.9)	(0.8)
Finite lived intangible assets net balance			$ 3.1	$ 4.2

Acquisition of Sirius Group - E

Acquisition of Sirius Group - Estimated remaining amortization expense for intangible assets with finite lives (Details) $ in Millions	Dec. 31, 2022 USD ($)
Business Combination and Asset Acquisition [Abstract]
2023	$ 11.1
2024	12
2025	11.4
2026	9.9
2027 and thereafter	71.6
Total remaining amortization expense	$ 116

Acquisition of Sirius Group -_2

Acquisition of Sirius Group - Financial results included in the condensed consolidated statements of income (Details) - Sirius Group $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Total revenues	$ 1,224.3
Net loss	$ (161.2)

Acquisition of Sirius Group - S

Acquisition of Sirius Group - Supplemental pro forma information (Details) - Sirius Group - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Total revenues	$ 2,343.9	$ 2,613.6
Net income (loss)	$ 60.7	$ (268.4)

Segment reporting - Narrative (

Segment reporting - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 segment product
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Reinsurance | Credit & Bond | Minimum
Segment Reporting Information [Line Items]
Coverage period	60 days
Reinsurance | Credit & Bond | Maximum
Segment Reporting Information [Line Items]
Coverage period	120 days
Insurance & Services | Environmental
Segment Reporting Information [Line Items]
Number of core products | product	4

Segment reporting - Operating s

Segment reporting - Operating segment results (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Gross premiums written	$ 3,409.7	$ 2,236.5	$ 588.5
Net premiums written	2,549.2	1,734.2	542.2
Net premiums earned	2,318.1	1,717	610.8
Loss and loss adjustment expenses incurred, net	1,588.4	1,326.5	465.3
Acquisition costs, net	461.9	387.8	187.1
Other underwriting expenses	184.5	158.8	30.1
Net underwriting income (loss)	83.3	(156.1)	(71.7)
Segment income (loss)	83.3	(156.1)	(71.7)
Net realized and unrealized investment gains (losses)	(225.5)	(16.9)	69.2
Net realized and unrealized investment gains (losses) from related party investment funds	(210.5)	304	195
Net investment income	113.3	25.4	14.7
Other revenues	110.2	151.2	0
Net corporate and other expenses	(312.8)	(266.6)	(41.9)
Intangible asset amortization	(8.1)	(5.9)	0
Interest expense	(38.6)	(34)	(8.2)
Foreign exchange gains (losses)	66	44	(5.2)
Income (loss) before income tax (expense) benefit	(422.7)	45.1	151.9
Income tax (expense) benefit	36.7	10.7	(8.1)
Net income (loss)	(386)	55.8	143.8
Net income attributable to noncontrolling interests	(0.8)	2.3	(0.3)
Net income (loss) available to SiriusPoint	$ (386.8)	$ 58.1	$ 143.5
Underwriting Ratios:
Loss ratio	68.50%	77.30%	76.20%
Acquisition cost ratio	19.90%	22.60%	30.60%
Other underwriting expenses ratio	8%	9.20%	4.90%
Combined ratio	96.40%	109.10%	111.70%
Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	$ 3,405.6	$ 2,248.3	$ 559.6
Net premiums written	2,545.6	1,777.7	513.3
Net premiums earned	2,299.9	1,733.7	582.7
Loss and loss adjustment expenses incurred, net	1,574.6	1,310	465.4
Acquisition costs, net	583.5	452.4	161.8
Other underwriting expenses	176.6	134.7	24.2
Net underwriting income (loss)	(34.8)	(163.4)	(68.7)
Segment income (loss)	(3.5)	(152.4)	(68.3)
Income (loss) before income tax (expense) benefit	(3.5)	(152.4)	(68.3)
Income tax (expense) benefit	0	0	0
Net income (loss)	(3.5)	(152.4)	(68.3)
Net income attributable to noncontrolling interests	0	0	0
Net income (loss) available to SiriusPoint	$ (3.5)	$ (152.4)	$ (68.3)
Underwriting Ratios:
Loss ratio	68.50%	75.60%	79.90%
Acquisition cost ratio	25.40%	26.10%	27.80%
Other underwriting expenses ratio	7.70%	7.80%	4.20%
Combined ratio	101.60%	109.50%	111.90%
Operating Segments | Services
Segment Reporting Information [Line Items]
Net fee-related income	$ 36.3	$ 13.2	$ 0.7
Net realized and unrealized investment gains (losses)	(6.1)	(4.5)
Other revenues	215.5	133.7	1.7
Net corporate and other expenses	(179.2)	(120.5)	(1)
Net income attributable to noncontrolling interests	1.1	2.3	(0.3)
Net income (loss) available to SiriusPoint	31.3	11	0.4
Eliminations
Segment Reporting Information [Line Items]
Gross premiums written	0	0	0
Net premiums written	0	0	0
Net premiums earned	0	0	0
Loss and loss adjustment expenses incurred, net	(5.2)	(2.6)	0
Acquisition costs, net	(118.6)	(67.6)	(0.1)
Other underwriting expenses	0	0	0
Net underwriting income (loss)	123.8	70.2	0.1
Segment income (loss)	(9.6)	(12.4)	(1.6)
Income (loss) before income tax (expense) benefit	(9.6)	(12.4)	(1.6)
Income tax (expense) benefit	0	0	0
Net income (loss)	(9.6)	(12.4)	(1.6)
Net income attributable to noncontrolling interests	0	0	0
Net income (loss) available to SiriusPoint	(9.6)	(12.4)	(1.6)
Eliminations | Services
Segment Reporting Information [Line Items]
Net fee-related income	(133.4)	(82.6)	(1.7)
Net realized and unrealized investment gains (losses)	0	0
Other revenues	(133.4)	(82.6)	(1.7)
Net corporate and other expenses	0	0	0
Net income attributable to noncontrolling interests	0	0	0
Net income (loss) available to SiriusPoint	(133.4)	(82.6)	(1.7)
Corporate
Segment Reporting Information [Line Items]
Gross premiums written	4.1	(11.8)	28.9
Net premiums written	3.6	(43.5)	28.9
Net premiums earned	18.2	(16.7)	28.1
Loss and loss adjustment expenses incurred, net	19	19.1	(0.1)
Acquisition costs, net	(3)	3	25.4
Other underwriting expenses	7.9	24.1	5.9
Net underwriting income (loss)	(5.7)	(62.9)	(3.1)
Segment income (loss)	(5.7)	(62.9)	(3.1)
Net realized and unrealized investment gains (losses)	(219.4)	(12.4)	69.2
Net realized and unrealized investment gains (losses) from related party investment funds	(210.5)	304	195
Net investment income	113.3	25.4	14.7
Other revenues	28.1	100.1
Net corporate and other expenses	(133.6)	(146.1)	(40.9)
Intangible asset amortization	(8.1)	(5.9)
Interest expense	(38.6)	(34)	(8.2)
Foreign exchange gains (losses)	66	44	(5.2)
Income (loss) before income tax (expense) benefit	(408.5)	212.2	221.5
Income tax (expense) benefit	36.7	10.7	(8.1)
Net income (loss)	(371.8)	222.9	213.4
Net income attributable to noncontrolling interests	(1.9)	0	0
Net income (loss) available to SiriusPoint	(373.7)	222.9	213.4
Segment Measure Reclass
Segment Reporting Information [Line Items]
Segment income (loss)	102.1	71.6	1.3
Net realized and unrealized investment gains (losses)	(6.1)	(4.5)
Other revenues	82.1	51.1
Net corporate and other expenses	(179.2)	(120.5)	(1)
Income (loss) before income tax (expense) benefit	(1.1)	(2.3)	0.3
Income tax (expense) benefit	0	0	0
Net income (loss)	(1.1)	(2.3)	0.3
Net income attributable to noncontrolling interests	1.1	2.3	(0.3)
Net income (loss) available to SiriusPoint	0	0	0
Segment Measure Reclass | Services
Segment Reporting Information [Line Items]
Net fee-related income	97.1	69.4	1
Net realized and unrealized investment gains (losses)	6.1	4.5
Other revenues	(82.1)	(51.1)	0
Net corporate and other expenses	179.2	120.5	1
Net income attributable to noncontrolling interests	(1.1)	(2.3)	0.3
Net income (loss) available to SiriusPoint	102.1	71.6	1.3
Reinsurance | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	1,521.4	1,350.4	534.1
Net premiums written	1,199.6	1,124.9	497.3
Net premiums earned	1,213.1	1,210.9	575.6
Loss and loss adjustment expenses incurred, net	855.9	989.4	459.5
Acquisition costs, net	310.3	302.7	160.4
Other underwriting expenses	113.8	105.5	24
Net underwriting income (loss)	(66.9)	(186.7)	(68.3)
Segment income (loss)	(71)	(186.4)	(68.3)
Income (loss) before income tax (expense) benefit	$ (71)	$ (186.4)	$ (68.3)
Underwriting Ratios:
Loss ratio	70.60%	81.70%	79.80%
Acquisition cost ratio	25.60%	25%	27.90%
Other underwriting expenses ratio	9.40%	8.70%	4.20%
Combined ratio	105.60%	115.40%	111.90%
Reinsurance | Operating Segments | Services
Segment Reporting Information [Line Items]
Net fee-related income	$ (0.2)	$ 0	$ 0
Net realized and unrealized investment gains (losses)	(3.9)	0.3
Other revenues	(0.2)	0	0
Net corporate and other expenses	0	0	0
Net income attributable to noncontrolling interests	0	0	0
Net income (loss) available to SiriusPoint	(4.1)	0.3	0
Insurance & Services | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	1,884.2	897.9	25.5
Net premiums written	1,346	652.8	16
Net premiums earned	1,086.8	522.8	7.1
Loss and loss adjustment expenses incurred, net	718.7	320.6	5.9
Acquisition costs, net	273.2	149.7	1.4
Other underwriting expenses	62.8	29.2	0.2
Net underwriting income (loss)	32.1	23.3	(0.4)
Segment income (loss)	67.5	34	0
Income (loss) before income tax (expense) benefit	$ 67.5	$ 34	$ 0
Underwriting Ratios:
Loss ratio	66.10%	61.30%	83.10%
Acquisition cost ratio	25.10%	28.60%	19.70%
Other underwriting expenses ratio	5.80%	5.60%	2.80%
Combined ratio	97%	95.50%	105.60%
Insurance & Services | Operating Segments | Services
Segment Reporting Information [Line Items]
Net fee-related income	$ 36.5	$ 13.2	$ 0.7
Net realized and unrealized investment gains (losses)	(2.2)	(4.8)
Other revenues	215.7	133.7	1.7
Net corporate and other expenses	(179.2)	(120.5)	(1)
Net income attributable to noncontrolling interests	1.1	2.3	(0.3)
Net income (loss) available to SiriusPoint	$ 35.4	$ 10.7	$ 0.4

Segment reporting -Net premiums

Segment reporting -Net premiums written by location and reportable segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net premiums written	$ 2,549.2	$ 1,734.2	$ 542.2
Client Location: United States and Canada
Segment Reporting Information [Line Items]
Net premiums written	1,886.9	1,141	313.9
Client Location: Europe
Segment Reporting Information [Line Items]
Net premiums written	365.2	300.1	114.5
Client Location: Bermuda, the Caribbean and Latin America
Segment Reporting Information [Line Items]
Net premiums written	226	128	108.6
Client Location: Asia and Other
Segment Reporting Information [Line Items]
Net premiums written	71.1	165.1	5.2
Underwriting Location: United States and Canada
Segment Reporting Information [Line Items]
Net premiums written	1,501	857.6	241.2
Underwriting Location: Europe
Segment Reporting Information [Line Items]
Net premiums written	639.8	455.3
Underwriting Location: Bermuda, the Caribbean and Latin America
Segment Reporting Information [Line Items]
Net premiums written	406	369.1	301
Underwriting Location: Asia and Other
Segment Reporting Information [Line Items]
Net premiums written	2.4	52.2
Operating Segments
Segment Reporting Information [Line Items]
Net premiums written	2,545.6	1,777.7	513.3
Operating Segments | Reinsurance
Segment Reporting Information [Line Items]
Net premiums written	1,199.6	1,124.9	497.3
Operating Segments | Reinsurance | Client Location: United States and Canada
Segment Reporting Information [Line Items]
Net premiums written	746.9	579.1	300.1
Operating Segments | Reinsurance | Client Location: Europe
Segment Reporting Information [Line Items]
Net premiums written	241.6	309.5	83.7
Operating Segments | Reinsurance | Client Location: Bermuda, the Caribbean and Latin America
Segment Reporting Information [Line Items]
Net premiums written	171.4	114.3	108.6
Operating Segments | Reinsurance | Client Location: Asia and Other
Segment Reporting Information [Line Items]
Net premiums written	39.7	122	4.9
Operating Segments | Reinsurance | Underwriting Location: United States and Canada
Segment Reporting Information [Line Items]
Net premiums written	569.2	447.1	236.3
Operating Segments | Reinsurance | Underwriting Location: Europe
Segment Reporting Information [Line Items]
Net premiums written	384.4	379.8
Operating Segments | Reinsurance | Underwriting Location: Bermuda, the Caribbean and Latin America
Segment Reporting Information [Line Items]
Net premiums written	243.6	246.1	261
Operating Segments | Reinsurance | Underwriting Location: Asia and Other
Segment Reporting Information [Line Items]
Net premiums written	2.4	51.9
Operating Segments | Insurance & Services
Segment Reporting Information [Line Items]
Net premiums written	1,346	652.8	16
Operating Segments | Insurance & Services | Client Location: United States and Canada
Segment Reporting Information [Line Items]
Net premiums written	1,139.5	560.3	13.8
Operating Segments | Insurance & Services | Client Location: Europe
Segment Reporting Information [Line Items]
Net premiums written	120.5	36.4	1.9
Operating Segments | Insurance & Services | Client Location: Bermuda, the Caribbean and Latin America
Segment Reporting Information [Line Items]
Net premiums written	54.6	13.7	0
Operating Segments | Insurance & Services | Client Location: Asia and Other
Segment Reporting Information [Line Items]
Net premiums written	31.4	42.4	0.3
Operating Segments | Insurance & Services | Underwriting Location: United States and Canada
Segment Reporting Information [Line Items]
Net premiums written	931.3	408.9	4.9
Operating Segments | Insurance & Services | Underwriting Location: Europe
Segment Reporting Information [Line Items]
Net premiums written	255	93
Operating Segments | Insurance & Services | Underwriting Location: Bermuda, the Caribbean and Latin America
Segment Reporting Information [Line Items]
Net premiums written	159.7	150.9	11.1
Operating Segments | Insurance & Services | Underwriting Location: Asia and Other
Segment Reporting Information [Line Items]
Net premiums written	0	0
Corporate
Segment Reporting Information [Line Items]
Net premiums written	3.6	(43.5)	28.9
Corporate | Client Location: United States and Canada
Segment Reporting Information [Line Items]
Net premiums written	0.5	1.6	0
Corporate | Client Location: Europe
Segment Reporting Information [Line Items]
Net premiums written	3.1	(45.8)	28.9
Corporate | Client Location: Bermuda, the Caribbean and Latin America
Segment Reporting Information [Line Items]
Net premiums written	0	0	0
Corporate | Client Location: Asia and Other
Segment Reporting Information [Line Items]
Net premiums written	0	0.7	0
Corporate | Underwriting Location: United States and Canada
Segment Reporting Information [Line Items]
Net premiums written	0.5	1.6	0
Corporate | Underwriting Location: Europe
Segment Reporting Information [Line Items]
Net premiums written	0.4	(17.5)
Corporate | Underwriting Location: Bermuda, the Caribbean and Latin America
Segment Reporting Information [Line Items]
Net premiums written	2.7	(27.9)	$ 28.9
Corporate | Underwriting Location: Asia and Other
Segment Reporting Information [Line Items]
Net premiums written	$ 0	$ 0.3

Cash, cash equivalents, restr_3

Cash, cash equivalents, restricted cash and restricted investments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 705.3	$ 999.8
Restricted cash	208.4	948.6
Total cash, cash equivalents and restricted cash	913.7	1,948.4	$ 1,713.9	$ 1,654
Restricted investments securing reinsurance contracts and letter of credit facilities	2,202.2	1,107
Total cash, cash equivalents, restricted cash and restricted investments	3,115.9	3,055.4
Managing general underwriters
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	25.2	16.6
Letter of credit facilities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	34.3	500.2
Reinsurance contracts
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 148.9	$ 431.8

Fair value measurements - Inves

Fair value measurements - Investments categorized by the level of the fair value hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets
Debt securities, available for sale	$ 2,635.5	$ 0
Debt securities, trading	1,526	2,085.6
Equity securities	1.6	2.8
Short-term investments	984.6	1,075.8
Other long-term investments	377.2	456.1
Cost and equity method investments	104.8	89.2
Total assets	5,663.2	4,530.5
Liabilities
Securities sold, not yet purchased	27	0
Securities sold under an agreement to repurchase	18
Liability-classified capital instruments	60.4	87.8
Derivative liabilities	8.6	3.2
Total liabilities	114	91
Asset-backed securities
Assets
Debt securities, available for sale	230.7
Debt securities, trading	553.7	513.1
Residential mortgage-backed securities
Assets
Debt securities, available for sale	340.7
Debt securities, trading	133.6	301.9
Commercial mortgage-backed securities
Assets
Debt securities, available for sale	61.2
Debt securities, trading	113.4	147.3
Corporate debt securities
Assets
Debt securities, available for sale	415.7
Debt securities, trading	363.5	602.6
U.S. government and government agency
Assets
Debt securities, available for sale	1,550.6
Debt securities, trading	270.4	385.4
Non-U.S. government and government agency
Assets
Debt securities, available for sale	36.6
Debt securities, trading	88.2	132.3
U.S. states, municipalities and political subdivision
Assets
Debt securities, trading		0.2
Preferred stocks
Assets
Debt securities, trading	3.2	2.8
Fair Value, Inputs, Level 1, 2 and 3
Assets
Debt securities, available for sale	2,635.5
Debt securities, trading	1,526	2,085.6
Equity securities	1.6	2.8
Short-term investments	984.6	1,075.8
Other long-term investments	227.3	262
Derivative assets	9.5	0.6
Total assets	5,384.5	3,426.8
Fair Value, Inputs, Level 1, 2 and 3 | Asset-backed securities
Assets
Debt securities, available for sale	230.7
Debt securities, trading	553.7	513.1
Fair Value, Inputs, Level 1, 2 and 3 | Residential mortgage-backed securities
Assets
Debt securities, available for sale	340.7
Debt securities, trading	133.6	301.9
Fair Value, Inputs, Level 1, 2 and 3 | Commercial mortgage-backed securities
Assets
Debt securities, available for sale	61.2
Debt securities, trading	113.4	147.3
Fair Value, Inputs, Level 1, 2 and 3 | Corporate debt securities
Assets
Debt securities, available for sale	415.7
Debt securities, trading	363.5	602.6
Fair Value, Inputs, Level 1, 2 and 3 | U.S. government and government agency
Assets
Debt securities, available for sale	1,550.6
Debt securities, trading	270.4	385.4
Fair Value, Inputs, Level 1, 2 and 3 | Non-U.S. government and government agency
Assets
Debt securities, available for sale	36.6
Debt securities, trading	88.2	132.3
Fair Value, Inputs, Level 1, 2 and 3 | U.S. states, municipalities and political subdivision
Assets
Debt securities, trading		0.2
Fair Value, Inputs, Level 1, 2 and 3 | Preferred stocks
Assets
Debt securities, trading	3.2	2.8
Fair Value, Inputs, Level 1, 2 and 3 | Fixed income mutual funds
Assets
Equity securities		2.1
Fair Value, Inputs, Level 1, 2 and 3 | Common stocks
Assets
Equity securities		0.7
Quoted prices in active markets (Level 1)
Assets
Debt securities, available for sale	1,551.2
Debt securities, trading	272.8	378.7
Equity securities	1.6	2.8
Short-term investments	972.8	1,073.2
Other long-term investments	0	0
Derivative assets	0	0.2
Total assets	2,798.4	1,454.9
Liabilities
Securities sold, not yet purchased	27
Securities sold under an agreement to repurchase	0
Liability-classified capital instruments	0	0
Derivative liabilities	0	0
Total liabilities	27	0
Quoted prices in active markets (Level 1) | Asset-backed securities
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Quoted prices in active markets (Level 1) | Residential mortgage-backed securities
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Quoted prices in active markets (Level 1) | Commercial mortgage-backed securities
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Quoted prices in active markets (Level 1) | Corporate debt securities
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Quoted prices in active markets (Level 1) | U.S. government and government agency
Assets
Debt securities, available for sale	1,546.2
Debt securities, trading	264.1	360.9
Quoted prices in active markets (Level 1) | Non-U.S. government and government agency
Assets
Debt securities, available for sale	5
Debt securities, trading	8.7	17.8
Quoted prices in active markets (Level 1) | U.S. states, municipalities and political subdivision
Assets
Debt securities, trading		0
Quoted prices in active markets (Level 1) | Preferred stocks
Assets
Debt securities, trading	0	0
Quoted prices in active markets (Level 1) | Fixed income mutual funds
Assets
Equity securities		2.1
Quoted prices in active markets (Level 1) | Common stocks
Assets
Equity securities		0.7
Significant other observable inputs (Level 2)
Assets
Debt securities, available for sale	1,084.3
Debt securities, trading	1,250	1,704.1
Equity securities	0	0
Short-term investments	11.8	2.6
Other long-term investments	0	0
Derivative assets	0	0
Total assets	2,346.1	1,706.7
Liabilities
Securities sold, not yet purchased	0
Securities sold under an agreement to repurchase	18
Liability-classified capital instruments	39	30.6
Derivative liabilities	0	0
Total liabilities	57	30.6
Significant other observable inputs (Level 2) | Asset-backed securities
Assets
Debt securities, available for sale	230.7
Debt securities, trading	553.7	513.1
Significant other observable inputs (Level 2) | Residential mortgage-backed securities
Assets
Debt securities, available for sale	340.7
Debt securities, trading	133.6	301.9
Significant other observable inputs (Level 2) | Commercial mortgage-backed securities
Assets
Debt securities, available for sale	61.2
Debt securities, trading	113.4	147.3
Significant other observable inputs (Level 2) | Corporate debt securities
Assets
Debt securities, available for sale	415.7
Debt securities, trading	363.5	602.6
Significant other observable inputs (Level 2) | U.S. government and government agency
Assets
Debt securities, available for sale	4.4
Debt securities, trading	6.3	24.5
Significant other observable inputs (Level 2) | Non-U.S. government and government agency
Assets
Debt securities, available for sale	31.6
Debt securities, trading	79.5	114.5
Significant other observable inputs (Level 2) | U.S. states, municipalities and political subdivision
Assets
Debt securities, trading		0.2
Significant other observable inputs (Level 2) | Preferred stocks
Assets
Debt securities, trading	0	0
Significant other observable inputs (Level 2) | Fixed income mutual funds
Assets
Equity securities		0
Significant other observable inputs (Level 2) | Common stocks
Assets
Equity securities		0
Significant unobservable inputs (Level 3)
Assets
Debt securities, available for sale	0
Debt securities, trading	3.2	2.8
Equity securities	0	0
Short-term investments	0	0
Other long-term investments	227.3	262
Derivative assets	9.5	0.4
Total assets	240	265.2
Liabilities
Securities sold, not yet purchased	0
Securities sold under an agreement to repurchase	0
Liability-classified capital instruments	21.4	57.2
Derivative liabilities	8.6	3.2
Total liabilities	30	60.4
Significant unobservable inputs (Level 3) | Asset-backed securities
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Significant unobservable inputs (Level 3) | Residential mortgage-backed securities
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Significant unobservable inputs (Level 3) | Corporate debt securities
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Significant unobservable inputs (Level 3) | U.S. government and government agency
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Significant unobservable inputs (Level 3) | Non-U.S. government and government agency
Assets
Debt securities, available for sale	0
Debt securities, trading	0	0
Significant unobservable inputs (Level 3) | U.S. states, municipalities and political subdivision
Assets
Debt securities, trading		0
Significant unobservable inputs (Level 3) | Preferred stocks
Assets
Debt securities, trading	3.2	2.8
Significant unobservable inputs (Level 3) | Fixed income mutual funds
Assets
Equity securities		0
Significant unobservable inputs (Level 3) | Common stocks
Assets
Equity securities		0
Valued at NAV
Assets
Investments in funds valued at NAV	$ 173.9	$ 1,014.5

Fair value measurements - Recon

Fair value measurements - Reconciliation of investments measured at fair value using Level 3 inputs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 265.3	$ 5.2
Transfers in to (out of) Level 3	0	(1.2)
Purchases	45.4	90.2
Assets Acquired		252.5
Sales	(24.7)	(79.1)
Realized and Unrealized Gains (Losses)	(46)	(2.3)
Change in Unrealized Gains (Losses) in OCI	0
Ending balance	$ 240	$ 265.3
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Investment Income (Loss) And Gain (Loss) On Investments	Net Investment Income (Loss) And Gain (Loss) On Investments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (60.4)	$ (1)
Transfers in to (out of) Level 3	0	28.2
Purchases	0	(138)
Assets Acquired		(2.7)
Sales	(3.4)	1.9
Realized and Unrealized Gains (Losses)	33.8	51.2
Change in Unrealized Gains (Losses) in OCI	0
Ending balance	$ (30)	$ (60.4)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Investment Income (Loss) And Gain (Loss) On Investments	Net Investment Income (Loss) And Gain (Loss) On Investments
Liability-classified capital instruments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (57.2)	$ 0
Transfers in to (out of) Level 3	0	27
Purchases	0	(137.6)
Assets Acquired		0
Sales	0	0
Realized and Unrealized Gains (Losses)	35.8	53.4
Change in Unrealized Gains (Losses) in OCI	0
Ending balance	(21.4)	(57.2)
Contingent consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0
Transfers in to (out of) Level 3		0
Purchases		0
Assets Acquired		(0.7)
Sales		1.9
Realized and Unrealized Gains (Losses)		(1.2)
Ending balance		0
Derivative liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(3.2)	(1)
Transfers in to (out of) Level 3	0	1.2
Purchases	0	(0.4)
Assets Acquired		(2)
Sales	(3.4)	0
Realized and Unrealized Gains (Losses)	(2)	(1)
Change in Unrealized Gains (Losses) in OCI	0
Ending balance	(8.6)	(3.2)
Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2.8	0
Transfers in to (out of) Level 3	0	0
Purchases	0	10
Assets Acquired		2.8
Sales	0	(10)
Realized and Unrealized Gains (Losses)	0.4	0
Change in Unrealized Gains (Losses) in OCI	0
Ending balance	3.2	2.8
Other long-term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	262.1	4
Transfers in to (out of) Level 3	0	0
Purchases	2.1	71.2
Assets Acquired		216.6
Sales	(24.7)	(24.9)
Realized and Unrealized Gains (Losses)	(12.2)	(4.8)
Change in Unrealized Gains (Losses) in OCI	0
Ending balance	227.3	262.1
Derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0.4	1.2
Transfers in to (out of) Level 3	0	(1.2)
Purchases	43.3	0
Assets Acquired		0.3
Sales	0	(1.4)
Realized and Unrealized Gains (Losses)	(34.2)	1.5
Change in Unrealized Gains (Losses) in OCI	0
Ending balance	9.5	0.4
Loan participations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	0
Transfers in to (out of) Level 3		0
Purchases		9
Assets Acquired		32.8
Sales		(42.8)
Realized and Unrealized Gains (Losses)		1
Ending balance		$ 0

Fair value measurements - Finan

Fair value measurements - Financial instruments not measured at fair value (Details) - Level 2 - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value | Series B preference shares
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Series B preference shares	$ 186	$ 220.9
Fair Value | Subordinated Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Long-term debt	259	302.3
Fair Value | Senior Notes | 2016 SIG Senior Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Long-term debt	343.7	412.8
Fair Value | Senior Notes | 2015 Senior Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Long-term debt	112.6	120.5
Carrying Value | Series B preference shares
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Series B preference shares	200	200
Carrying Value | Subordinated Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Long-term debt	258.6	296.3
Carrying Value | Senior Notes | 2016 SIG Senior Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Long-term debt	404.8	406
Carrying Value | Senior Notes | 2015 Senior Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Long-term debt	$ 114.6	$ 114.4

Investments - Summary of debt s

Investments - Summary of debt securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt securities, available for sale
Cost or amortized cost	$ 2,678.1
Gross unrealized gains	4.9
Gross unrealized losses	(47.4)
Net foreign currency gains (losses)	(0.1)
Fair value	2,635.5	$ 0
Debt securities, trading
Cost or amortized cost	1,630.1	2,099.3
Gross unrealized gains	0.9	2.7
Gross unrealized losses	(100.7)	(15.6)
Net foreign currency gains (losses)	(4.3)	(0.8)
Fair value	1,526	2,085.6
Securities sold, not yet purchased, at fair value	27	0
Debt securities, available for sale, allowance for credit losses	0
Asset-backed securities
Debt securities, available for sale
Cost or amortized cost	234.1
Gross unrealized gains	0.9
Gross unrealized losses	(4.3)
Net foreign currency gains (losses)	0
Fair value	230.7
Debt securities, trading
Cost or amortized cost	575.5	512.6
Gross unrealized gains	0.1	0.9
Gross unrealized losses	(21.9)	(0.4)
Net foreign currency gains (losses)	0	0
Fair value	553.7	513.1
Residential mortgage-backed securities
Debt securities, available for sale
Cost or amortized cost	354.3
Gross unrealized gains	0.3
Gross unrealized losses	(13.9)
Net foreign currency gains (losses)	0
Fair value	340.7
Debt securities, trading
Cost or amortized cost	155.9	306.5
Gross unrealized gains	0	0
Gross unrealized losses	(22.3)	(4.6)
Net foreign currency gains (losses)	0	0
Fair value	133.6	301.9
Commercial mortgage-backed securities
Debt securities, available for sale
Cost or amortized cost	62.1
Gross unrealized gains	0
Gross unrealized losses	(0.9)
Net foreign currency gains (losses)	0
Fair value	61.2
Debt securities, trading
Cost or amortized cost	130.5	148.4
Gross unrealized gains	0	0.6
Gross unrealized losses	(17.1)	(1.7)
Net foreign currency gains (losses)	0	0
Fair value	113.4	147.3
Corporate debt securities
Debt securities, available for sale
Cost or amortized cost	428.5
Gross unrealized gains	0.5
Gross unrealized losses	(13.1)
Net foreign currency gains (losses)	(0.2)
Fair value	415.7
Debt securities, trading
Cost or amortized cost	391.4	605.5
Gross unrealized gains	0	0.6
Gross unrealized losses	(27.2)	(3.5)
Net foreign currency gains (losses)	(0.7)	0
Fair value	363.5	602.6
U.S. government and government agency
Debt securities, available for sale
Cost or amortized cost	1,561.9
Gross unrealized gains	3.2
Gross unrealized losses	(14.5)
Net foreign currency gains (losses)	0
Fair value	1,550.6
Debt securities, trading
Cost or amortized cost	278.6	388.1
Gross unrealized gains	0	0.1
Gross unrealized losses	(8.2)	(2.8)
Net foreign currency gains (losses)	0	0
Fair value	270.4	385.4
Non-U.S. government and government agency
Debt securities, available for sale
Cost or amortized cost	37.2
Gross unrealized gains	0
Gross unrealized losses	(0.7)
Net foreign currency gains (losses)	0.1
Fair value	36.6
Debt securities, trading
Cost or amortized cost	95.8	135.4
Gross unrealized gains	0	0.3
Gross unrealized losses	(4)	(2.6)
Net foreign currency gains (losses)	(3.6)	(0.8)
Fair value	88.2	132.3
U.S. states, municipalities and political subdivision
Debt securities, trading
Cost or amortized cost		0.2
Gross unrealized gains		0
Gross unrealized losses		0
Net foreign currency gains (losses)		0
Fair value		0.2
Preferred stocks
Debt securities, trading
Cost or amortized cost	2.4	2.6
Gross unrealized gains	0.8	0.2
Gross unrealized losses	0	0
Net foreign currency gains (losses)	0	0
Fair value	3.2	2.8
U.S. government and government agency
Debt securities, trading
Securities sold, not yet purchased, at fair value	$ 27	$ 0

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($)		12 Months Ended
	Feb. 23, 2022	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Weighted average duration of debt securities		1 year 9 months 18 days	1 year 7 months 6 days
Affiliated entity
Debt and Equity Securities, FV-NI [Line Items]
Debt securities		$ 530,700,000	$ 0
Third Point LLC, 2022 IMA | Inventive fees | Affiliated entity
Debt and Equity Securities, FV-NI [Line Items]
Fee percentage	15%
Third Point LLC, 2022 IMA | Management fees | Affiliated entity
Debt and Equity Securities, FV-NI [Line Items]
Fee percentage	0.50%
Third Point LLC, 2022 IMA | Advisory fees | Affiliated entity
Debt and Equity Securities, FV-NI [Line Items]
Fee amount	$ 1,500,000
Third Point Enhanced LP
Debt and Equity Securities, FV-NI [Line Items]
Investments in related investment party funds, unfunded commitments		0
Third Point Venture Offshore Fund I LP
Debt and Equity Securities, FV-NI [Line Items]
Investments in related investment party funds, unfunded commitments		$ 9,500,000
Percentage of net asset value held		16.80%
Third Point Venture Offshore Fund II LP
Debt and Equity Securities, FV-NI [Line Items]
Investments in related investment party funds, unfunded commitments		$ 22,500,000
Percentage of net asset value held		17.80%
TPOC Portfolio
Debt and Equity Securities, FV-NI [Line Items]
Eligible withdrawal period following a cause event	120 days
Hedge funds and private equity funds
Debt and Equity Securities, FV-NI [Line Items]
Distribution receivable		$ 6,300,000
Investments in related investment party funds, unfunded commitments		31,500,000	26,700,000
Sub-prime
Debt and Equity Securities, FV-NI [Line Items]
Debt securities		95,300,000	51,800,000
Sub-prime | AAA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities		56,100,000	35,100,000
Sub-prime | AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities		20,000,000	16,100,000
Sub-prime | Not Rated
Debt and Equity Securities, FV-NI [Line Items]
Debt securities		$ 19,200,000
Sub-prime | A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities			$ 600,000

Investments - Debt securities b

Investments - Debt securities by contractual maturity (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt securities, trading - Cost or Amortized cost
Due in one year or less	$ 240.4	$ 145.6
Due after one year through five years	426.5	870.4
Due after five years through ten years	63.4	69.6
Due after ten years	35.5	43.6
Cost or amortized cost	1,630.1	2,099.3
Debt securities, trading - Fair value
Due in one year or less	230.9	145.1
Due after one year through five years	407	862.4
Due after five years through ten years	55.7	68.6
Due after ten years	28.5	44.4
Fair value	1,526	2,085.6
Debt securities, AFS - Cost or amortized cost
Due in one year or less	104.2
Due after one year through five years	1,822.7
Due after five years through ten years	95.8
Due after ten years	4.9
Cost or amortized cost	2,678.1
Debt securities, AFS - Fair value
Due in one year or less	104
Due after one year through five years	1,802
Due after five years through ten years	92.3
Due after ten years	4.6
Fair value	2,635.5	0
Mortgage-backed and asset-backed securities
Debt securities, trading - Cost or Amortized cost
Debt securities without single maturity date	861.9	967.5
Debt securities, trading - Fair value
Debt securities without single maturity date	800.7	962.3
Debt securities, AFS - Cost or amortized cost
Mortgage-backed and asset-backed securities	650.5
Debt securities, AFS - Fair value
Mortgage-backed and asset-backed securities	632.6
Preferred stocks
Debt securities, trading - Cost or Amortized cost
Debt securities without single maturity date	2.4	2.6
Cost or amortized cost	2.4	2.6
Debt securities, trading - Fair value
Debt securities without single maturity date	3.2	2.8
Fair value	3.2	$ 2.8
Debt securities, AFS - Cost or amortized cost
Mortgage-backed and asset-backed securities	0
Debt securities, AFS - Fair value
Mortgage-backed and asset-backed securities	$ 0

Investments - Ratings and fair

Investments - Ratings and fair value of debt securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading	$ 1,526	$ 2,085.6
Debt securities, available for sale	2,635.5	0
AAA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading	564.4	696.4
Debt securities, available for sale	172.8
AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading	523.2	884.1
Debt securities, available for sale	1,907.6
A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading	181.1	278.5
Debt securities, available for sale	188.9
BBB
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading	158.1	153.1
Debt securities, available for sale	149.9
Other
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading	99.2	$ 73.5
Debt securities, available for sale	$ 216.3

Investments - Summary of equity

Investments - Summary of equity securities and other long-term investments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Equity securities, Cost or amortized cost	$ 1.8	$ 4.5
Equity securities, Gross unrealized gains	0	0.1
Equity securities, Gross unrealized losses	(0.2)	(2)
Equity securities, Net foreign currency gains	0	0.2
Equity securities, Fair value	1.6	2.8
Other long-term investments, Cost or amortized cost	392	443
Other long-term investments, Gross unrealized gains	27.5	28.9
Other long-term investments, Gross unrealized losses	(41.8)	(16.8)
Other long-term investments, net foreign currency gains	(0.5)	1
Other long-term investments, Fair value	$ 377.2	$ 456.1

Investments - Carrying value of

Investments - Carrying value of other-long term investments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	$ 377.2	$ 456.1
Valued at Level 3
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	227.3	262
Hedge funds and private equity funds
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	84.9	195.7
Other long-term investments, unfunded commitments	31.5	26.7
Hedge funds and private equity funds | Valued at NAV
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	45.1	115.2
Hedge funds and private equity funds | Valued at Level 3
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	25.1	80.5
Strategic Investments and Other Investments
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, unfunded commitments	16	13.8
Strategic Investments
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	262	215.3
Other investments
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	$ 30.3	$ 45.1

Investments - Investments in he

Investments - Investments in hedge funds and private equity interests by investment objective and sector (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	$ 377.2	$ 456.1
Hedge funds and private equity funds
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	84.9	195.7
Other long-term investments, unfunded commitments	31.5	26.7
Total hedge funds
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	29.7	70.3
Other long-term investments, unfunded commitments	0	0
Long/short multi-sector
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	8.8	19.8
Other long-term investments, unfunded commitments	0	0
Distressed mortgage credit
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0	24.6
Other long-term investments, unfunded commitments	0	0
Private credit
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	20.7	24.2
Other long-term investments, unfunded commitments	0	0
Other
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.2	1.7
Other long-term investments, unfunded commitments	0	0
Total private equity funds
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	55.2	125.4
Other long-term investments, unfunded commitments	31.5	26.7
Energy infrastructure & services
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	10.2	48.4
Other long-term investments, unfunded commitments	5	19
Multi-sector
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	6.6	10.1
Other long-term investments, unfunded commitments	5.1	5.1
Healthcare
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	19.9	31
Other long-term investments, unfunded commitments	0.3	2.2
Life settlement
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	13.6	12.9
Other long-term investments, unfunded commitments	0	0
Manufacturing/Industrial
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0	19.9
Other long-term investments, unfunded commitments	0	0
Private equity secondaries
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.4	0.5
Other long-term investments, unfunded commitments	0.1	0.4
Other
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	4.5	2.6
Other long-term investments, unfunded commitments	$ 21	$ 0

Investments - Hedge funds with

Investments - Hedge funds with redemption restrictions and advance notice period requirements (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	$ 377.2	$ 456.1
Hedge funds
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	29.7	$ 70.3
Hedge funds | 1-29 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | 30-59 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.1
Hedge funds | 60-89 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	8.8
Hedge funds | 90-119 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.2
Hedge funds | 120+ days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	20.6
Hedge funds | Quarterly
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	8.9
Hedge funds | Quarterly | 1-29 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Quarterly | 30-59 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.1
Hedge funds | Quarterly | 60-89 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	8.7
Hedge funds | Quarterly | 90-119 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.1
Hedge funds | Quarterly | 120+ days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Semi-annual
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.1
Hedge funds | Semi-annual | 1-29 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Semi-annual | 30-59 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Semi-annual | 60-89 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.1
Hedge funds | Semi-annual | 90-119 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Semi-annual | 120+ days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Annual
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	20.7
Hedge funds | Annual | 1-29 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Annual | 30-59 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Annual | 60-89 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0
Hedge funds | Annual | 90-119 days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	0.1
Hedge funds | Annual | 120+ days notice
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	$ 20.6

Investments - Private equity fu

Investments - Private equity funds subject to lock-up or commitment periods (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	$ 377.2	$ 456.1
Private equity funds
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	55.2	$ 125.4
Private equity funds | 1 - 3 years
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	19.5
Private equity funds | 3 – 5 years
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	19.9
Private equity funds | 5 – 10 years
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments, Fair value	$ 15.8

Investments - Investment in rel

Investments - Investment in related party investment funds (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Investments in related party investment funds, at fair value	$ 128.8	$ 909.6
Affiliated entity
Debt and Equity Securities, FV-NI [Line Items]
Investments in related party investment funds, at fair value	128.8	909.6
Third Point Enhanced LP | Affiliated entity
Debt and Equity Securities, FV-NI [Line Items]
Investments in related party investment funds, at fair value	100.3	878.2
Third Point Venture Offshore Fund I LP | Affiliated entity
Debt and Equity Securities, FV-NI [Line Items]
Investments in related party investment funds, at fair value	26	31.4
Related Party Fund - Third Point Venture Offshore Fund II LP | Affiliated entity
Debt and Equity Securities, FV-NI [Line Items]
Investments in related party investment funds, at fair value	$ 2.5	$ 0

Total realized and unrealized_3

Total realized and unrealized investment gains (losses) and net investment income - Summary of total realized and unrealized investment gains and net investment income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Investment expenses	$ (20.3)	$ (11.6)	$ (1.1)
Net realized and unrealized investment gains (losses) and net investment income	(322.7)	312.5	278.9
Debt securities, available for sale
Net Investment Income [Line Items]
Realized and unrealized investment gains and net investment income before investment expenses	35.1	0	0
Debt securities, trading
Net Investment Income [Line Items]
Realized and unrealized investment gains and net investment income before investment expenses	(115.6)	(4.9)	72.7
Short-term investments
Net Investment Income [Line Items]
Realized and unrealized investment gains and net investment income before investment expenses	17.7	1.6	0
Other long-term investments
Net Investment Income [Line Items]
Realized and unrealized investment gains and net investment income before investment expenses	(10.6)	35.2	0
Equity securities
Net Investment Income [Line Items]
Realized and unrealized investment gains and net investment income before investment expenses	(0.4)	(2.5)	0
Related party investment funds
Net Investment Income [Line Items]
Realized and unrealized investment gains and net investment income before investment expenses	(210.5)	304	195
Before other investment expenses and investment income (loss) on cash and cash equivalents
Net Investment Income [Line Items]
Realized and unrealized investment gains and net investment income before investment expenses	(284.3)	333.4	267.7
Cash and cash equivalents
Net Investment Income [Line Items]
Realized and unrealized investment gains and net investment income before investment expenses	$ (18.1)	$ (9.3)	$ 12.3

Total realized and unrealized_4

Total realized and unrealized investment gains (losses) and net investment income - Summary of net realized and unrealized investment gains (losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 56.2	$ 40.4	$ 64.3
Gross realized losses	(132.3)	(9.6)	(15.9)
Net realized gains (losses) on investments	(76.1)	30.8	48.4
Net unrealized gains (losses) on investments	(149.4)	(47.7)	20.8
Net realized and unrealized gains (losses) on investments	(225.5)	(16.9)	69.2
Net realized and unrealized gains (losses) from related party investments	$ 5.6	$ 12.9	$ 0

Total realized and unrealized_5

Total realized and unrealized investment gains (losses) and net investment income - Summary of net realized investment gains (losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Debt securities, available for sale	$ 2.7	$ 0	$ 0
Debt securities, trading	(66.7)	12.3	46.4
Short-term investments	(2.9)	(0.1)	0
Equity securities	(2.3)	(0.1)	0
Other long-term investments	2.9	14.1	0
Net investment income (loss) on cash and cash equivalents	(9.8)	4.6	2
Net realized gains (losses) on investments	(76.1)	30.8	48.4
Realized gains (losses) due to foreign currency	$ (25.2)	$ 4.5	$ 1.6

Total realized and unrealized_6

Total realized and unrealized investment gains (losses) and net investment income - Summary of net unrealized investment gains (losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Debt securities, trading	$ (105)	$ (40.2)	$ 14.9
Short-term investments	(0.3)	1.4	0
Equity securities	1.8	(2.5)	0
Other long-term investments	(25.7)	11.2	0
Net investment income (loss) on cash and cash equivalents	(20.2)	(17.6)	5.9
Net unrealized investment gains (losses)	(149.4)	(47.7)	20.8
Unrealized losses on debt securities, excluding foreign currency	15	23.9	0
Unrealized gains (losses) due to foreign currency	$ 17.9	$ (32.8)	$ 6

Total realized and unrealized_7

Total realized and unrealized investment gains (losses) and net investment income - Summary of gains (losses) attributable to unrealized investment gains (losses) on level 3 investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Debt securities, trading	$ (105)	$ (40.2)	$ 14.9
Other long-term investments	(25.7)	11.2	0
Net unrealized investment gains (losses)	(149.4)	(47.7)	20.8
Level 3
Net Investment Income [Line Items]
Debt securities, trading	0.7	0	0
Other long-term investments	(15.4)	(5.7)	0
Net unrealized investment gains (losses)	$ (14.7)	$ (5.7)	$ 0

Investments in unconsolidated_3

Investments in unconsolidated entities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	$ 377.2	$ 456.1
Equity method eligible unconsolidated entities, using the fair value option
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	147.9	168.1
Equity method investments
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	41.8	83.2
Other unconsolidated investments, at fair value
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	124.5	198.8
Other unconsolidated investments, at cost
Debt and Equity Securities, FV-NI [Line Items]
Other long-term investments	$ 63	$ 6

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 financial_institution	Dec. 31, 2022 USD ($)
Interest rate cap
Derivative [Line Items]
Number of financial institutions | financial_institution	2
Foreign currency
Derivative [Line Items]
Collateral held | $		$ 15.2

Derivatives - Classification an

Derivatives - Classification and fair value of derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative liabilities at fair value	$ 8.6	$ 3.2
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accounts payable, accrued expenses and other liabilities	Accounts payable, accrued expenses and other liabilities
Derivatives not designated as hedging instruments | Foreign currency forwards
Derivative [Line Items]
Derivative assets at fair value	$ 9	$ 0
Derivative liabilities at fair value	0	1.3
Notional Value	425.1	83.6
Derivatives not designated as hedging instruments | Foreign currency swaps
Derivative [Line Items]
Derivative assets at fair value	0	0
Derivative liabilities at fair value	1.5	1.7
Notional Value	264.6	40
Derivatives not designated as hedging instruments | Weather derivatives
Derivative [Line Items]
Derivative assets at fair value	0	0
Derivative liabilities at fair value	4.9	0.8
Notional Value	30.6	6.2
Derivatives not designated as hedging instruments | Foreign currency futures contracts
Derivative [Line Items]
Derivative assets at fair value	0	0.2
Derivative liabilities at fair value	0	0
Notional Value	0	133.9
Derivatives not designated as hedging instruments | Equity warrants
Derivative [Line Items]
Derivative assets at fair value	0	0.1
Derivative liabilities at fair value	0	0
Notional Value	0	0.1
Derivatives not designated as hedging instruments | Interest rate cap
Derivative [Line Items]
Derivative assets at fair value	0	0
Derivative liabilities at fair value	0	0
Notional Value	$ 0	$ 250

Derivatives - Classification _2

Derivatives - Classification and net impact on earnings of derivatives (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Foreign currency futures contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	$ (32.1)	$ (8)	$ 0
Foreign currency forwards
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	(8.1)	(1.3)	0
Weather derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	7.3	0.9	0
Foreign currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	1.5	0.2	0
Equity warrants
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	(0.1)	(0.3)	0
Foreign currency call options
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	$ 0	$ 0.4	$ 0

Derivatives - Listing currency,

Derivatives - Listing currency, fair value and notional amounts of underwriting-related derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative liabilities, Fair value	$ 8.6	$ 3.2
Reinsurance contracts accounted for as derivative assets | British Pound
Derivative [Line Items]
Derivative assets, Fair value	0.5	1.2
Derivative assets, Notional Amounts	16.5	49.3
Derivative liabilities, Fair value	2.2	0.1
Derivative liabilities, Notional Amounts	$ 76.4	$ 37.4

Variable and voting interest _3

Variable and voting interest entities - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 11,036.3	$ 10,618.3
Liabilities	8,953.7	8,115
Pre-tax loss	422.7	(45.1)	$ (151.9)
Alstead Re
Variable Interest Entity [Line Items]
Assets	14	9.8
Liabilities	9	5.5
Arcadian
Variable Interest Entity [Line Items]
Assets	32.3	29
Liabilities	$ 9.7	7
Ownership percentage	49%
Maximum financial exposure	$ 18
Joyn
Variable Interest Entity [Line Items]
Assets		7.8
Liabilities		$ 4.1
Pre-tax loss	8.7
Alta Signa
Variable Interest Entity [Line Items]
Assets	8
Liabilities	$ 2.1
VOE, ownership percentage	75.10%
TP Enhanced Fund | TP Enhanced Fund
Variable Interest Entity [Line Items]
Ownership percentage	89.40%
Variable interest entity, primary beneficiary | TP Enhanced Fund | TP GP
Variable Interest Entity [Line Items]
Ownership percentage	10.60%

Variable and voting interest _4

Variable and voting interest entities - Reconciliation of noncontrolling interests (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, beginning of period	$ (0.4)	$ 1.4
Sirius Group acquisition and other business combinations	0.8	0.3
Net income (loss) attributable to noncontrolling interests	0.8	(2.3)	$ 0.3
Contributions (Redemptions)	0	0.2
Derecognition of noncontrolling interest	6.7	0
Balance, end of period	$ 7.9	$ (0.4)	$ 1.4

Variable and voting interest _5

Variable and voting interest entities - Total assets and maximum exposure to loss for unconsolidated variable interest entities (Details) - Variable interest entity, not primary beneficiary, excluding investments in Related Party Investment Funds - Other long-term investments - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Total VIE Assets
Total VIE Assets	$ 211.5	$ 326.2
Maximum Exposure to Loss
On-Balance Sheet	144	177.5
Off-Balance Sheet	2	2.1
Total	$ 146	$ 179.6

Loss and loss adjustment expe_3

Loss and loss adjustment expense reserves - Summary of loss and loss adjustment expense reserves (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Insurance [Abstract]
Case loss and loss adjustment expense reserves	$ 1,980.2	$ 1,916.8
Incurred but not reported loss and loss adjustment expense reserves	3,226.5	2,868.2
Unallocated loss adjustment expense reserves	62	55.8
Deferred gains on retroactive reinsurance contracts	0	0.6
Loss and loss adjustment expense reserves	$ 5,268.7	$ 4,841.4	$ 1,310.1	$ 1,111.7

Loss and loss adjustment expe_4

Loss and loss adjustment expense reserves - Activity in the loss and loss adjustment expense reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves for loss and loss adjustment expenses, beginning of year	$ 4,841.4	$ 1,310.1	$ 1,111.7
Less: loss and loss adjustment expenses recoverable, beginning of year	(1,215.3)	(14.4)	(5.5)
Less: deferred charges on retroactive reinsurance contracts	(1.4)	(6)	(6.7)
Net reserves for loss and loss adjustment expenses, beginning of year	3,624.7	1,289.7	1,099.5
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in:
Current year	1,609.7	1,369.1	431.5
Prior years	(21.3)	(42.6)	33.8
Total incurred loss and loss adjustment expenses	1,588.4	1,326.5	465.3
Net loss and loss adjustment expenses paid in respect of losses occurring in:
Current year	(316.1)	(271.2)	(73.6)
Prior years	(939.2)	(1,178.9)	(209.5)
Total net paid losses	(1,255.3)	(1,450.1)	(283.1)
Foreign currency translation	(66.3)	(9.2)	8
Amounts acquired as a result of Sirius Group acquisition	0	2,467.8	0
Net reserves for loss and loss adjustment expenses, end of year	3,891.5	3,624.7	1,289.7
Plus: loss and loss adjustment expenses recoverable, end of year	1,376.2	1,215.3	14.4
Plus: deferred charges on retroactive reinsurance contracts	1	1.4	6
Gross reserves for loss and loss adjustment expenses, end of year	$ 5,268.7	$ 4,841.4	$ 1,310.1

Loss and loss adjustment expe_5

Loss and loss adjustment expense reserves - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Net adverse (favorable) change in prior year loss reserve development	$ (21.3)	$ (42.6)	$ 33.8
Increase in loss reserves resulting from a change in premium earnings estimates			18.8
Adverse reserve development related to change in loss reserve estimates			15
Increase in net underwriting loss			$ 30.5
Number of operating segments | segment	2
Corporate
Segment Reporting Information [Line Items]
Net adverse (favorable) change in prior year loss reserve development		(10.5)
Reinsurance | Operating Segments
Segment Reporting Information [Line Items]
Net adverse (favorable) change in prior year loss reserve development		(18.6)
Insurance & Services | Operating Segments
Segment Reporting Information [Line Items]
Net adverse (favorable) change in prior year loss reserve development		$ (13.5)

Loss and loss adjustment expe_6

Loss and loss adjustment expense reserves - Loss and loss adjustment expense reserves by accident year and line of business (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Claims Development [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	$ 3,775.9
Reinsurance | Operating Segments | Aviation & Space
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	473.5
IBNR loss and ALAE reserves, net	81.5
Cumulative net losses and allocated loss adjustment expenses paid	299.4
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	174.1
Net reserves for loss and allocated loss adjustment expenses prior to 2013	2.4
Net reserves for loss and allocated loss adjustment expenses, end of year	176.5
Reinsurance | Operating Segments | Aviation & Space | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	31.6	$ 31.4	$ 30.7	$ 31	$ 30.9	$ 30.8	$ 29.9	$ 31.2	$ 34.3	$ 38.4
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	29.4	29.4	28.5	28.4	27.1	26.4	24.7	22.1	18.1	12.4
Reinsurance | Operating Segments | Aviation & Space | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	29.7	29.2	30	28.3	29.7	29.8	30.8	34.3	31.8
IBNR loss and ALAE reserves, net	(2.2)
Cumulative net losses and allocated loss adjustment expenses paid	25.8	25.3	25.7	24.2	23.6	22	19.7	14.2	6.2
Reinsurance | Operating Segments | Aviation & Space | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	34.9	34.3	33.5	33.3	34	35	31	34.6
IBNR loss and ALAE reserves, net	1.7
Cumulative net losses and allocated loss adjustment expenses paid	34	33.4	32.8	32	30.5	24.2	18.2	8.8
Reinsurance | Operating Segments | Aviation & Space | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	36.3	35.2	34.9	35.3	33	32	31.7
IBNR loss and ALAE reserves, net	(0.1)
Cumulative net losses and allocated loss adjustment expenses paid	34.3	33.2	32	28.7	26.3	19.2	7.5
Reinsurance | Operating Segments | Aviation & Space | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	48.4	45.7	45.3	43.8	42.6	33.7
IBNR loss and ALAE reserves, net	0.5
Cumulative net losses and allocated loss adjustment expenses paid	40.6	39.1	35.5	32.2	23.5	8.9
Reinsurance | Operating Segments | Aviation & Space | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	63.2	60.7	58.2	50.3	47.7
IBNR loss and ALAE reserves, net	3.1
Cumulative net losses and allocated loss adjustment expenses paid	46.2	42.2	36.5	27.3	14.2
Reinsurance | Operating Segments | Aviation & Space | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	93.8	75.7	71.6	60.2
IBNR loss and ALAE reserves, net	21.2
Cumulative net losses and allocated loss adjustment expenses paid	37.7	32.3	22.3	8.3
Reinsurance | Operating Segments | Aviation & Space | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	39.9	41.5	39.8
IBNR loss and ALAE reserves, net	1.5
Cumulative net losses and allocated loss adjustment expenses paid	29.5	22.1	10.8
Reinsurance | Operating Segments | Aviation & Space | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	37.5	41.9
IBNR loss and ALAE reserves, net	9.8
Cumulative net losses and allocated loss adjustment expenses paid	15	6.5
Reinsurance | Operating Segments | Aviation & Space | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	58.2
IBNR loss and ALAE reserves, net	46
Cumulative net losses and allocated loss adjustment expenses paid	6.9
Reinsurance | Operating Segments | Casualty
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	2,942.1
IBNR loss and ALAE reserves, net	992.2
Cumulative net losses and allocated loss adjustment expenses paid	1,616.8
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	1,325.3
Net reserves for loss and allocated loss adjustment expenses prior to 2013	9.5
Net reserves for loss and allocated loss adjustment expenses, end of year	1,334.8
Reinsurance | Operating Segments | Casualty | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	57.2	57	57.6	57.4	57.8	57.9	57.9	57.9	53.4	72.1
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	55.9	56	55.4	55	53.6	51.4	46.8	40.4	27.8	11.3
Reinsurance | Operating Segments | Casualty | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	171.3	171.8	172.3	171.8	172.6	171.5	182.4	178.3	178.1
IBNR loss and ALAE reserves, net	0.8
Cumulative net losses and allocated loss adjustment expenses paid	168.2	167.2	166.2	164.3	161.1	153.5	147.6	128.3	51.1
Reinsurance | Operating Segments | Casualty | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	239.8	240.4	240.4	237.9	237.6	237.5	256.7	223.5
IBNR loss and ALAE reserves, net	5.9
Cumulative net losses and allocated loss adjustment expenses paid	226.7	223.7	218.9	210.9	201.3	184.6	151.7	75.7
Reinsurance | Operating Segments | Casualty | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	264.6	265.2	264.6	261.7	265.5	267.2	270.3
IBNR loss and ALAE reserves, net	12.1
Cumulative net losses and allocated loss adjustment expenses paid	239.3	232.3	224	212.3	196.4	171.4	64.9
Reinsurance | Operating Segments | Casualty | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	262.5	261.9	258.8	254.7	253.5	246.2
IBNR loss and ALAE reserves, net	27.7
Cumulative net losses and allocated loss adjustment expenses paid	212.6	199	180.1	157.2	136.1	82.3
Reinsurance | Operating Segments | Casualty | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	351.9	349.3	346.8	340.4	317.3
IBNR loss and ALAE reserves, net	63.7
Cumulative net losses and allocated loss adjustment expenses paid	237.5	211.2	151	111.2	57.2
Reinsurance | Operating Segments | Casualty | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	446	441.4	423.9	388.8
IBNR loss and ALAE reserves, net	138.3
Cumulative net losses and allocated loss adjustment expenses paid	236.9	181.2	116.2	45.5
Reinsurance | Operating Segments | Casualty | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	414.9	416.8	377.7
IBNR loss and ALAE reserves, net	214.3
Cumulative net losses and allocated loss adjustment expenses paid	137.2	65.7	38
Reinsurance | Operating Segments | Casualty | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	342.5	351.8
IBNR loss and ALAE reserves, net	211.9
Cumulative net losses and allocated loss adjustment expenses paid	77.9	29.1
Reinsurance | Operating Segments | Casualty | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	391.4
IBNR loss and ALAE reserves, net	317.5
Cumulative net losses and allocated loss adjustment expenses paid	24.6
Reinsurance | Operating Segments | Contingency
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	34.8
IBNR loss and ALAE reserves, net	1.9
Cumulative net losses and allocated loss adjustment expenses paid	26.1
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	8.7
Net reserves for loss and allocated loss adjustment expenses prior to 2013	0.8
Net reserves for loss and allocated loss adjustment expenses, end of year	9.5
Reinsurance | Operating Segments | Contingency | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
Reinsurance | Operating Segments | Contingency | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0	0
Reinsurance | Operating Segments | Contingency | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0
Reinsurance | Operating Segments | Contingency | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0
Reinsurance | Operating Segments | Contingency | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0.7	0.8	0.7	1.1	0.5	0.5
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0.6	0.6	0.6	0.4	0.1	(0.1)
Reinsurance | Operating Segments | Contingency | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	1.4	1.6	1.5	1.7	1.4
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	1.4	1.3	1.3	0.8	(0.1)
Reinsurance | Operating Segments | Contingency | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	1.8	1.8	1.8	1.8
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	1.5	1.2	1.1	(0.1)
Reinsurance | Operating Segments | Contingency | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	11.7	11.2	13.7
IBNR loss and ALAE reserves, net	1.2
Cumulative net losses and allocated loss adjustment expenses paid	11.2	4.1	3.2
Reinsurance | Operating Segments | Contingency | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	10.4	8.4
IBNR loss and ALAE reserves, net	0.1
Cumulative net losses and allocated loss adjustment expenses paid	7.3	3.6
Reinsurance | Operating Segments | Contingency | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	8.7
IBNR loss and ALAE reserves, net	0.6
Cumulative net losses and allocated loss adjustment expenses paid	4
Reinsurance | Operating Segments | Credit & Bond
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	270.8
IBNR loss and ALAE reserves, net	53.1
Cumulative net losses and allocated loss adjustment expenses paid	190.6
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	80.2
Net reserves for loss and allocated loss adjustment expenses prior to 2013	2.5
Net reserves for loss and allocated loss adjustment expenses, end of year	82.7
Reinsurance | Operating Segments | Credit & Bond | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	28.7	28.3	27.8	27.7	27.4	27.8	27	27.4	28.3	29.1
IBNR loss and ALAE reserves, net	0.8
Cumulative net losses and allocated loss adjustment expenses paid	26.2	24.5	24.2	24.2	24	23.9	23.2	22	19	11.1
Reinsurance | Operating Segments | Credit & Bond | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	22.1	22.1	21.9	22	22.2	23.2	25.2	24.6	25.1
IBNR loss and ALAE reserves, net	(2)
Cumulative net losses and allocated loss adjustment expenses paid	21.2	21	20.9	20.9	20.5	19.9	17.9	13.6	7.5
Reinsurance | Operating Segments | Credit & Bond | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	19.7	19.4	19.4	20	20.9	22.5	23.3	23.7
IBNR loss and ALAE reserves, net	0.6
Cumulative net losses and allocated loss adjustment expenses paid	18.3	18	18.1	18.2	18.1	16.8	12.6	4.6
Reinsurance | Operating Segments | Credit & Bond | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	16	16.6	16.3	16.7	17.6	17.9	19.3
IBNR loss and ALAE reserves, net	0.1
Cumulative net losses and allocated loss adjustment expenses paid	15.3	15	14.7	14.3	13.2	10.4	5.3
Reinsurance | Operating Segments | Credit & Bond | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	21.5	22.5	22.5	24	25	24.3
IBNR loss and ALAE reserves, net	3.2
Cumulative net losses and allocated loss adjustment expenses paid	17.3	15.9	15.5	14.4	10.2	3.9
Reinsurance | Operating Segments | Credit & Bond | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	29.7	30.8	30.5	31.3	30.8
IBNR loss and ALAE reserves, net	1.5
Cumulative net losses and allocated loss adjustment expenses paid	25.4	24.2	22.9	17.6	8.2
Reinsurance | Operating Segments | Credit & Bond | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	35.1	38	38.4	40.2
IBNR loss and ALAE reserves, net	3
Cumulative net losses and allocated loss adjustment expenses paid	28.5	26.8	20.7	9.7
Reinsurance | Operating Segments | Credit & Bond | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	38.9	41.1	44.7
IBNR loss and ALAE reserves, net	10.5
Cumulative net losses and allocated loss adjustment expenses paid	23.5	20.6	18.6
Reinsurance | Operating Segments | Credit & Bond | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	21.6	22.5
IBNR loss and ALAE reserves, net	9.6
Cumulative net losses and allocated loss adjustment expenses paid	7.2	4.4
Reinsurance | Operating Segments | Credit & Bond | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	37.5
IBNR loss and ALAE reserves, net	25.8
Cumulative net losses and allocated loss adjustment expenses paid	7.7
Reinsurance | Operating Segments | Marine & Energy
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	217.1
IBNR loss and ALAE reserves, net	36.1
Cumulative net losses and allocated loss adjustment expenses paid	147.6
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	69.5
Net reserves for loss and allocated loss adjustment expenses prior to 2013	0.9
Net reserves for loss and allocated loss adjustment expenses, end of year	70.4
Reinsurance | Operating Segments | Marine & Energy | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	14.9	15.2	15.6	15.5	15.4	15.4	15.8	16.6	17.8	19.9
IBNR loss and ALAE reserves, net	0.5
Cumulative net losses and allocated loss adjustment expenses paid	12.9	13	13	12.9	12.7	12.4	12.2	10.9	8.1	2.5
Reinsurance | Operating Segments | Marine & Energy | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	17.4	17.5	17.5	17.6	16.9	17.4	18.7	20.3	21.7
IBNR loss and ALAE reserves, net	(0.2)
Cumulative net losses and allocated loss adjustment expenses paid	16.1	16.1	16.1	15.1	15	14.5	13.2	9.8	3.8
Reinsurance | Operating Segments | Marine & Energy | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	26.2	26.2	26.3	25.8	26	26.5	28.6	26.7
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	25.3	25.3	25.2	24.6	23.6	19.5	10	3
Reinsurance | Operating Segments | Marine & Energy | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	24.5	24.4	24.5	24.4	24.5	28.2	29.9
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	23.6	23.1	22.1	20.1	17.5	14.2	5.9
Reinsurance | Operating Segments | Marine & Energy | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	31.2	31.1	31.5	29	30	34.1
IBNR loss and ALAE reserves, net	0.3
Cumulative net losses and allocated loss adjustment expenses paid	26.7	24.9	23.2	19	12.9	4.8
Reinsurance | Operating Segments | Marine & Energy | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	20.3	20	20.3	20.3	18.8
IBNR loss and ALAE reserves, net	0.9
Cumulative net losses and allocated loss adjustment expenses paid	15.9	15	14.3	8.7	2.8
Reinsurance | Operating Segments | Marine & Energy | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	19.2	19.1	18.9	18.5
IBNR loss and ALAE reserves, net	0.6
Cumulative net losses and allocated loss adjustment expenses paid	11.6	10.2	7.3	2.5
Reinsurance | Operating Segments | Marine & Energy | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	18.1	18	19.9
IBNR loss and ALAE reserves, net	5.2
Cumulative net losses and allocated loss adjustment expenses paid	8.4	6.3	1.9
Reinsurance | Operating Segments | Marine & Energy | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	22.8	24.6
IBNR loss and ALAE reserves, net	11.8
Cumulative net losses and allocated loss adjustment expenses paid	4.4	1.9
Reinsurance | Operating Segments | Marine & Energy | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	22.5
IBNR loss and ALAE reserves, net	17
Cumulative net losses and allocated loss adjustment expenses paid	2.7
Reinsurance | Operating Segments | Mortgage
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	41
IBNR loss and ALAE reserves, net	23.6
Cumulative net losses and allocated loss adjustment expenses paid	10.1
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	30.9
Net reserves for loss and allocated loss adjustment expenses prior to 2013	0
Net reserves for loss and allocated loss adjustment expenses, end of year	30.9
Reinsurance | Operating Segments | Mortgage | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.3	0.3
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0	0
Reinsurance | Operating Segments | Mortgage | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0.5	0.6	0.6	0.6	0.6	0.6	0.7	0.7	3.6
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0
Reinsurance | Operating Segments | Mortgage | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0.8	0.8	0.8	0.8	1.6	1.6	1.7	1.7
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0.8	0.8	0.8	0.8	0.7	0.7	0.5	0.3
Reinsurance | Operating Segments | Mortgage | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	1.7	1.9	2.2	1.4	5.8	5.5	5.9
IBNR loss and ALAE reserves, net	0.3
Cumulative net losses and allocated loss adjustment expenses paid	1	1	1	1	0.8	0.5	0.1
Reinsurance | Operating Segments | Mortgage | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	2.4	2.5	3.1	2.2	8.4	8
IBNR loss and ALAE reserves, net	0.8
Cumulative net losses and allocated loss adjustment expenses paid	1.2	1	1.1	1	0.7	0.1
Reinsurance | Operating Segments | Mortgage | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	4.3	4.9	5.5	4.3	11.2
IBNR loss and ALAE reserves, net	2.1
Cumulative net losses and allocated loss adjustment expenses paid	1.4	1.4	1.3	1.2	0.3
Reinsurance | Operating Segments | Mortgage | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	6.9	8	8.7	7
IBNR loss and ALAE reserves, net	4.1
Cumulative net losses and allocated loss adjustment expenses paid	1.7	1.8	1.6	0.8
Reinsurance | Operating Segments | Mortgage | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	7.8	11.8	12
IBNR loss and ALAE reserves, net	5
Cumulative net losses and allocated loss adjustment expenses paid	1.3	1.5	1.4
Reinsurance | Operating Segments | Mortgage | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	7.7	11.1
IBNR loss and ALAE reserves, net	5
Cumulative net losses and allocated loss adjustment expenses paid	1.1	1.1
Reinsurance | Operating Segments | Mortgage | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	8.8
IBNR loss and ALAE reserves, net	6.3
Cumulative net losses and allocated loss adjustment expenses paid	0.9
Reinsurance | Operating Segments | Property
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	3,949.7
IBNR loss and ALAE reserves, net	486.5
Cumulative net losses and allocated loss adjustment expenses paid	2,869.7
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	1,080
Net reserves for loss and allocated loss adjustment expenses prior to 2013	29.7
Net reserves for loss and allocated loss adjustment expenses, end of year	1,109.7
Reinsurance | Operating Segments | Property | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	230.1	230.5	231.2	230.8	231.4	231.7	233	236.2	247.2	224.2
IBNR loss and ALAE reserves, net	0.2
Cumulative net losses and allocated loss adjustment expenses paid	225.9	225.6	225.6	224.3	222.7	220.9	216.6	204.4	166.2	55.4
Reinsurance | Operating Segments | Property | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	205.5	205.5	205.2	205.5	205.8	205.5	201.3	203	198.3
IBNR loss and ALAE reserves, net	(0.6)
Cumulative net losses and allocated loss adjustment expenses paid	199.5	199.2	198.3	197.4	193.5	187.3	170.8	136.5	49.1
Reinsurance | Operating Segments | Property | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	211.2	211.6	211.5	211.5	212.8	212.3	208.2	210.8
IBNR loss and ALAE reserves, net	(5.6)
Cumulative net losses and allocated loss adjustment expenses paid	205.8	205.3	203.3	201	192.8	177.1	144.2	52.5
Reinsurance | Operating Segments | Property | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	285.6	285.8	286.6	288.6	288.3	285.6	286
IBNR loss and ALAE reserves, net	0.8
Cumulative net losses and allocated loss adjustment expenses paid	278	276.2	272.3	261.3	238.2	186.8	62.2
Reinsurance | Operating Segments | Property | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	510.3	514.2	514.6	508.9	499	455.5
IBNR loss and ALAE reserves, net	11.1
Cumulative net losses and allocated loss adjustment expenses paid	480.4	465.9	453.7	398.6	311.4	86.6
Reinsurance | Operating Segments | Property | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	502.4	510	516.9	510.1	452.8
IBNR loss and ALAE reserves, net	16.6
Cumulative net losses and allocated loss adjustment expenses paid	457.9	437.9	406.6	312.8	67.9
Reinsurance | Operating Segments | Property | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	483.8	500.2	500.8	515.1
IBNR loss and ALAE reserves, net	27.1
Cumulative net losses and allocated loss adjustment expenses paid	414.5	380.4	291.6	67.5
Reinsurance | Operating Segments | Property | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	524	554.9	563.1
IBNR loss and ALAE reserves, net	104.1
Cumulative net losses and allocated loss adjustment expenses paid	330.2	220.5	76.6
Reinsurance | Operating Segments | Property | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	662.1	596.9
IBNR loss and ALAE reserves, net	161.4
Cumulative net losses and allocated loss adjustment expenses paid	232.5	79.2
Reinsurance | Operating Segments | Property | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	334.7
IBNR loss and ALAE reserves, net	171.4
Cumulative net losses and allocated loss adjustment expenses paid	45
Insurance & Services | Operating Segments | A&H
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	2,036.8
IBNR loss and ALAE reserves, net	190.5
Cumulative net losses and allocated loss adjustment expenses paid	1,796.2
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	240.6
Net reserves for loss and allocated loss adjustment expenses prior to 2013	(0.4)
Net reserves for loss and allocated loss adjustment expenses, end of year	240.2
Insurance & Services | Operating Segments | A&H | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	115.5	115.6	115.5	115.7	115.8	116.6	117.2	117.7	122.2	124.6
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	115.3	115.3	115.3	115.2	115.2	115.8	114.5	113.1	102.7	54.1
Insurance & Services | Operating Segments | A&H | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	129.1	129.1	128.9	129	129.1	130	130	131.5	130.4
IBNR loss and ALAE reserves, net	0.1
Cumulative net losses and allocated loss adjustment expenses paid	126.8	126.8	126.8	126.7	126	126	124.3	110.9	59.1
Insurance & Services | Operating Segments | A&H | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	143.6	143.6	143.6	143.5	143.9	145.2	148.5	152.2
IBNR loss and ALAE reserves, net	0.3
Cumulative net losses and allocated loss adjustment expenses paid	143	143	143	142.9	142.6	141	129.6	75.2
Insurance & Services | Operating Segments | A&H | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	165.9	165.8	166.2	166.4	167.9	172	172.3
IBNR loss and ALAE reserves, net	2.3
Cumulative net losses and allocated loss adjustment expenses paid	163.1	163	163.3	162.8	160.9	149.3	97.6
Insurance & Services | Operating Segments | A&H | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	163.9	163.6	163.8	166	172.6	176.5
IBNR loss and ALAE reserves, net	(0.6)
Cumulative net losses and allocated loss adjustment expenses paid	160.8	160.7	160.3	159.5	146.9	58.8
Insurance & Services | Operating Segments | A&H | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	203.8	203.8	205.5	207.6	200.2
IBNR loss and ALAE reserves, net	(1.6)
Cumulative net losses and allocated loss adjustment expenses paid	205.8	205.4	204.2	187.5	90.6
Insurance & Services | Operating Segments | A&H | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	260.8	261.1	269.8	274.7
IBNR loss and ALAE reserves, net	(1.5)
Cumulative net losses and allocated loss adjustment expenses paid	255.7	252.6	235.6	130.9
Insurance & Services | Operating Segments | A&H | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	282.8	305.4	311.3
IBNR loss and ALAE reserves, net	13.7
Cumulative net losses and allocated loss adjustment expenses paid	273.2	246.1	107
Insurance & Services | Operating Segments | A&H | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	216.3	223.1
IBNR loss and ALAE reserves, net	21.2
Cumulative net losses and allocated loss adjustment expenses paid	182.8	120.6
Insurance & Services | Operating Segments | A&H | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	355.1
IBNR loss and ALAE reserves, net	156.6
Cumulative net losses and allocated loss adjustment expenses paid	169.7
Insurance & Services | Operating Segments | Environmental
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	23
IBNR loss and ALAE reserves, net	18.5
Cumulative net losses and allocated loss adjustment expenses paid	3.3
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	19.7
Net reserves for loss and allocated loss adjustment expenses prior to 2013	0
Net reserves for loss and allocated loss adjustment expenses, end of year	19.7
Insurance & Services | Operating Segments | Environmental | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0	0	0
Insurance & Services | Operating Segments | Environmental | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0	0
Insurance & Services | Operating Segments | Environmental | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0
Insurance & Services | Operating Segments | Environmental | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0
Insurance & Services | Operating Segments | Environmental | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0
Insurance & Services | Operating Segments | Environmental | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0.1	0.1	0.1	0.1	0.4
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0.1	0.1	0.1	0	0
Insurance & Services | Operating Segments | Environmental | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	2.8	2.7	4.6	4.5
IBNR loss and ALAE reserves, net	0.9
Cumulative net losses and allocated loss adjustment expenses paid	1.9	1.8	0.9	0
Insurance & Services | Operating Segments | Environmental | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	3.4	3.2	3.6
IBNR loss and ALAE reserves, net	2.9
Cumulative net losses and allocated loss adjustment expenses paid	0.5	0.3	0
Insurance & Services | Operating Segments | Environmental | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	4.9	4.7
IBNR loss and ALAE reserves, net	3.3
Cumulative net losses and allocated loss adjustment expenses paid	0.8	0
Insurance & Services | Operating Segments | Environmental | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	11.8
IBNR loss and ALAE reserves, net	11.4
Cumulative net losses and allocated loss adjustment expenses paid	0
Insurance & Services | Operating Segments | Workers’ Compensation
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	280.7
IBNR loss and ALAE reserves, net	106.4
Cumulative net losses and allocated loss adjustment expenses paid	94.6
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	186.1
Net reserves for loss and allocated loss adjustment expenses prior to 2013	0
Net reserves for loss and allocated loss adjustment expenses, end of year	186.1
Insurance & Services | Operating Segments | Workers’ Compensation | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0	0	0
Insurance & Services | Operating Segments | Workers’ Compensation | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0	0
Insurance & Services | Operating Segments | Workers’ Compensation | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0
Insurance & Services | Operating Segments | Workers’ Compensation | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0
Insurance & Services | Operating Segments | Workers’ Compensation | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0
Insurance & Services | Operating Segments | Workers’ Compensation | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0.6	1.2	1.1	1.5	1.5
IBNR loss and ALAE reserves, net	0.2
Cumulative net losses and allocated loss adjustment expenses paid	0.5	0.4	0.3	0.2	0
Insurance & Services | Operating Segments | Workers’ Compensation | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	15.7	15.7	16.6	18.6
IBNR loss and ALAE reserves, net	1.3
Cumulative net losses and allocated loss adjustment expenses paid	12.6	10	6.8	1.3
Insurance & Services | Operating Segments | Workers’ Compensation | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	47.6	46.9	45.8
IBNR loss and ALAE reserves, net	2.8
Cumulative net losses and allocated loss adjustment expenses paid	29.1	19.7	4.2
Insurance & Services | Operating Segments | Workers’ Compensation | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	119.1	94.9
IBNR loss and ALAE reserves, net	34.2
Cumulative net losses and allocated loss adjustment expenses paid	43.9	10.4
Insurance & Services | Operating Segments | Workers’ Compensation | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	97.7
IBNR loss and ALAE reserves, net	67.9
Cumulative net losses and allocated loss adjustment expenses paid	8.5
Insurance & Services | Operating Segments | Other
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	302.5
IBNR loss and ALAE reserves, net	257.2
Cumulative net losses and allocated loss adjustment expenses paid	29
Net reserves for loss and allocated loss adjustment expenses from 2013 to 2022	273.5
Net reserves for loss and allocated loss adjustment expenses prior to 2013	2
Net reserves for loss and allocated loss adjustment expenses, end of year	275.5
Insurance & Services | Operating Segments | Other | 2013
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0	0	$ 0
Insurance & Services | Operating Segments | Other | 2014
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	0	$ 0
Insurance & Services | Operating Segments | Other | 2015
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	0	$ 0
Insurance & Services | Operating Segments | Other | 2016
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	0	$ 0
Insurance & Services | Operating Segments | Other | 2017
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	0	$ 0
Insurance & Services | Operating Segments | Other | 2018
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	0	$ 0
Insurance & Services | Operating Segments | Other | 2019
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	0	0	0	0
IBNR loss and ALAE reserves, net	0
Cumulative net losses and allocated loss adjustment expenses paid	0	0	0	$ 0
Insurance & Services | Operating Segments | Other | 2020
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	2.2	2.2	2.6
IBNR loss and ALAE reserves, net	1.1
Cumulative net losses and allocated loss adjustment expenses paid	0.9	0.8	$ 0.4
Insurance & Services | Operating Segments | Other | 2021
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	62.1	61.7
IBNR loss and ALAE reserves, net	42.8
Cumulative net losses and allocated loss adjustment expenses paid	12.5	$ 1.4
Insurance & Services | Operating Segments | Other | 2022
Claims Development [Line Items]
Loss and allocated loss adjustment expenses incurred, net	238.2
IBNR loss and ALAE reserves, net	213.3
Cumulative net losses and allocated loss adjustment expenses paid	$ 15.6

Loss and loss adjustment expe_7

Loss and loss adjustment expense reserves - Reconciliation of loss development information to loss and loss adjustment expense reserves (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	$ 3,775.9
Total loss and allocated loss adjustment expenses recoverable	1,376.2	$ 1,215.3	$ 14.4	$ 5.5
Unallocated loss adjustment expense reserves	62
Other items, net	53.6
Deferred charges on retroactive reinsurance contracts	1	1.4	6	6.7
Gross reserves for loss and loss adjustment expenses, end of year	5,268.7	$ 4,841.4	$ 1,310.1	$ 1,111.7
Corporate
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	239.9
Total loss and allocated loss adjustment expenses recoverable	427.4
Reinsurance | Operating Segments | Aviation & Space
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	176.5
Total loss and allocated loss adjustment expenses recoverable	60
Reinsurance | Operating Segments | Casualty
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	1,334.8
Total loss and allocated loss adjustment expenses recoverable	9.1
Reinsurance | Operating Segments | Contingency
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	9.5
Total loss and allocated loss adjustment expenses recoverable	2.6
Reinsurance | Operating Segments | Credit & Bond
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	82.7
Total loss and allocated loss adjustment expenses recoverable	7.5
Reinsurance | Operating Segments | Marine & Energy
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	70.4
Total loss and allocated loss adjustment expenses recoverable	9.3
Reinsurance | Operating Segments | Mortgage
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	30.9
Total loss and allocated loss adjustment expenses recoverable	1.9
Reinsurance | Operating Segments | Property
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	1,109.7
Total loss and allocated loss adjustment expenses recoverable	527.3
Insurance & Services | Operating Segments | A&H
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	240.2
Total loss and allocated loss adjustment expenses recoverable	72.5
Insurance & Services | Operating Segments | Environmental
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	19.7
Total loss and allocated loss adjustment expenses recoverable	7.6
Insurance & Services | Operating Segments | Workers’ Compensation
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	186.1
Total loss and allocated loss adjustment expenses recoverable	121.4
Insurance & Services | Operating Segments | Other
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net reserves for loss and allocated loss adjustment expenses, end of year	275.5
Total loss and allocated loss adjustment expenses recoverable	$ 129.6

Loss and loss adjustment expe_8

Loss and loss adjustment expense reserves - Claims duration (Details) - Operating Segments	Dec. 31, 2022
Reinsurance | Aviation & Space
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	19.10%
Year 2	23.20%
Year 3	15.30%
Year 4	8.30%
Year 5	6.40%
Year 6	2.70%
Year 7	3.40%
Year 8	0.20%
Year 9	2.40%
Year 10	0%
Reinsurance | Casualty
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	16.30%
Year 2	20.80%
Year 3	13%
Year 4	10.20%
Year 5	5.80%
Year 6	3.50%
Year 7	2.10%
Year 8	1%
Year 9	0.70%
Year 10	(0.20%)
Reinsurance | Contingency
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	30.30%
Year 2	26.30%
Year 3	51.80%
Year 4	13.90%
Year 5	3.60%
Year 6	1.60%
Year 7	0.10%
Year 8	(1.40%)
Year 9	0%
Year 10	(19.10%)
Reinsurance | Credit & Bond
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	29.90%
Year 2	25.10%
Year 3	15.50%
Year 4	5.60%
Year 5	2.50%
Year 6	2%
Year 7	0.40%
Year 8	0.50%
Year 9	1%
Year 10	6.20%
Reinsurance | Marine & Energy
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	14.70%
Year 2	26.90%
Year 3	20.90%
Year 4	10.10%
Year 5	4.80%
Year 6	3.20%
Year 7	2.20%
Year 8	0.10%
Year 9	0.20%
Year 10	(0.20%)
Reinsurance | Mortgage
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	12.60%
Year 2	11%
Year 3	3.70%
Year 4	1.90%
Year 5	0.80%
Year 6	1.50%
Year 7	0.40%
Year 8	(0.30%)
Year 9	(0.20%)
Year 10	0%
Reinsurance | Property
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	16.30%
Year 2	38.90%
Year 3	18.20%
Year 4	7.70%
Year 5	3.20%
Year 6	1.80%
Year 7	0.70%
Year 8	0.40%
Year 9	0.10%
Year 10	0.20%
Insurance & Services | A&H
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	47.30%
Year 2	41.50%
Year 3	8.20%
Year 4	1%
Year 5	0.30%
Year 6	0%
Year 7	0%
Year 8	0%
Year 9	0%
Year 10	0%
Insurance & Services | Environmental
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	0.70%
Year 2	17.90%
Year 3	17.10%
Year 4	3.70%
Year 5	4.40%
Year 6	0%
Year 7	0%
Year 8	0%
Year 9	0%
Year 10	0%
Insurance & Services | Workers’ Compensation
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	8.70%
Year 2	29.90%
Year 3	19.90%
Year 4	16.40%
Year 5	11.70%
Year 6	0%
Year 7	0%
Year 8	0%
Year 9	0%
Year 10	0%
Insurance & Services | Other
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Year 1	5.80%
Year 2	17.80%
Year 3	7.20%
Year 4	8.30%
Year 5	0%
Year 6	0%
Year 7	0%
Year 8	0%
Year 9	0%
Year 10	0%

Third party reinsurance - Break

Third party reinsurance - Breakdown of written and earned premiums and loss and loss adjustment expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Written premiums:
Direct	$ 1,403.9	$ 718	$ 19
Assumed	2,005.8	1,518.5	569.5
Gross premiums written	3,409.7	2,236.5	588.5
Ceded	(860.5)	(502.3)	(46.3)
Net premiums written	2,549.2	1,734.2	542.2
Premiums earned:
Direct	1,153.6	600.8	1
Assumed	1,915.2	1,598.5	638.8
Gross premiums earned	3,068.8	2,199.3	639.8
Ceded	(750.7)	(482.3)	(29)
Net premiums earned	2,318.1	1,717	610.8
Loss and loss adjustment expense:
Direct	778	349.3	0.8
Assumed	1,386.8	1,506.1	483.2
Loss and loss adjustment expense incurred	2,164.8	1,855.4	484
Ceded	(576.4)	(528.9)	(18.7)
Loss and loss adjustment expense incurred, net	$ 1,588.4	$ 1,326.5	$ 465.3

Third party reinsurance - Narra

Third party reinsurance - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Insurance [Abstract]
Loss and loss adjustment expenses recoverable, net	$ 1,376.2	$ 1,215.3	$ 14.4	$ 5.5

Third party reinsurance - Gross

Third party reinsurance - Gross and net recoverable amounts by the reinsurer's credit rating and the percentage of total recoverables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 1,376.2	$ 1,215.3	$ 14.4	$ 5.5
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 1,376.2	$ 1,215.3
% of total	100%	100%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Collateral
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 658.7	$ 560.2
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Net
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	717.5	655.1
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | AA
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 252.8	$ 149.5
% of total	29.50%	22.60%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | AA | Collateral
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 41.2	$ 1.7
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | AA | Net
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	211.6	147.8
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | A
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 370.6	$ 360.8
% of total	44.90%	52.60%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | A | Collateral
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 48.5	$ 16
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | A | Net
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	322.1	344.8
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | BBB or lower
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 246.7	$ 212.3
% of total	19.80%	12.50%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | BBB or lower | Collateral
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 104.8	$ 130.5
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | BBB or lower | Net
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	141.9	81.8
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Not rated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 506.1	$ 492.7
% of total	5.80%	12.30%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Not rated | Pallas Reinsurance Company Ltd.
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 327.7	$ 355.9
% of total	23.80%	29.30%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Not rated | Collateral
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 464.2	$ 412
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Not rated | Collateral | Pallas Reinsurance Company Ltd.
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 327.7	$ 355.9
% of total	100%	100%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Not rated | Net
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 41.9	$ 80.7

Third party reinsurance - Five

Third party reinsurance - Five highest gross recoverable amounts by reinsurers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 1,376.2	$ 1,215.3	$ 14.4	$ 5.5
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 1,376.2	$ 1,215.3
% of total	100%	100%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Not rated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 506.1	$ 492.7
% of total	5.80%	12.30%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Collateralized
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 658.7	$ 560.2
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Collateralized | Not rated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	464.2	412
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Pallas Reinsurance Company Ltd. | Not rated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 327.7	$ 355.9
% of total	23.80%	29.30%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Pallas Reinsurance Company Ltd. | Collateralized | Not rated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 327.7	$ 355.9
% of total	100%	100%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | General Insurance Corporation of India | BBB
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 184.9	$ 140.9
% of total	13.40%	11.60%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | General Insurance Corporation of India | Collateralized | BBB
Ceded Credit Risk [Line Items]
% of total	31.30%	89.40%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Arch Reinsurance Ltd | A+
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 79.6
% of total	5.80%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Arch Reinsurance Ltd | Collateralized | A+
Ceded Credit Risk [Line Items]
% of total	1.30%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Swiss Reinsurance Company Ltd | AA-
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 68.6	$ 34.8
% of total	5%	2.90%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Swiss Reinsurance Company Ltd | Collateralized | AA-
Ceded Credit Risk [Line Items]
% of total	25.80%	13.40%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Pie Casualty Insurance Company | Not rated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net	$ 44.1
% of total	3.20%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Pie Casualty Insurance Company | Collateralized | Not rated
Ceded Credit Risk [Line Items]
% of total	100%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Argo Capital Group Ltd. | Not rated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net		$ 28.6
% of total		2.40%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | Argo Capital Group Ltd. | Collateralized | Not rated
Ceded Credit Risk [Line Items]
% of total		100%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | LLoyd's of London | A+
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable, net		$ 27.4
% of total		2.30%
Loss and loss adjustment expenses recoverable | Reinsurer Concentration Risk | LLoyd's of London | Collateralized | A+
Ceded Credit Risk [Line Items]
% of total		51.80%

Allowance for expected credit_3

Allowance for expected credit losses - Summary of allowance for expected credit losses (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Insurance and reinsurance balances receivable, net	$ 1,876.9	$ 1,708.2
Loss and loss adjustment expenses recoverable, net	1,376.2	1,215.3	$ 14.4	$ 5.5
Other assets	52.4	14.5
Total assets in scope	3,305.5	2,938
Accounts, Notes, Loans and Financing Receivable [Line Items]
Insurance and reinsurance balances receivable, net	1,876.9	$ 1,708.2
Premiums Receivable | Customer Concentration Risk | One Customer
Receivables [Abstract]
Insurance and reinsurance balances receivable, net	236.5
Accounts, Notes, Loans and Financing Receivable [Line Items]
Insurance and reinsurance balances receivable, net	$ 236.5

Allowance for expected credit_4

Allowance for expected credit losses - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for expected credit losses	$ 34.3	$ 21.6
Current expected credit losses	$ 12.7	$ 21	$ 0.6
Assets within scope of credit losses | Credit concentration risk | AM Best or S&P
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	55%
Assets within scope of credit losses | Credit concentration risk | AM Best or S&P | AM Best or S&P, rated A- or better
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	78%

Debt and letter of credit fac_3

Debt and letter of credit facilities - Summary of debt obligations (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total debt	$ 778	$ 816.7
Subordinated Notes
Debt Instrument [Line Items]
Debt, at face value	264.3	303.1
Unamortized discount	(5.7)	(6.8)
Total debt	$ 258.6	$ 296.3
Effective rate	6%	4.10%
Senior Notes | 2016 Senior Notes
Debt Instrument [Line Items]
Debt, at face value	$ 400	$ 400
Unamortized premium	4.8	6
Total debt	$ 404.8	$ 406
Effective rate	4.50%	4.50%
Senior Notes | 2015 Senior Notes
Debt Instrument [Line Items]
Debt, at face value	$ 115	$ 115
Unamortized issuance costs	(0.4)	(0.6)
Total debt	$ 114.6	$ 114.4
Effective rate	7%	7%

Debt and letter of credit fac_4

Debt and letter of credit facilities - Narrative (Details)				12 Months Ended
	Feb. 26, 2021 USD ($)	Sep. 22, 2017 USD ($)	Nov. 01, 2016 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 22, 2017 SEK (kr)
Debt Instrument [Line Items]
Interest expense				$ 38,600,000	$ 34,000,000
Foreign exchange (losses) gains				66,000,000	44,000,000	$ (5,200,000)
Revolving Credit Facility
Debt Instrument [Line Items]
Contractual term	3 years
Maximum borrowing capacity	$ 300,000,000
Extension term	12 months
Outstanding borrowings				0
Subordinated Notes
Debt Instrument [Line Items]
Face value of debt issued		$ 346,100,000					kr 2,750,000,000
Debt issue price, percentage		100%
Interest expense				13,200,000	11,100,000
Foreign exchange (losses) gains				38,000,000	25,200,000
Senior Notes | 2016 Senior Notes
Debt Instrument [Line Items]
Face value of debt issued			$ 400,000,000
Debt issue price, percentage			99.20%
Interest expense				17,200,000	14,700,000
Proceeds from issuance of debt, net of costs			$ 392,400,000
Interest rate			4.60%
Senior Notes | 2015 Senior Notes
Debt Instrument [Line Items]
Face value of debt issued				115,000,000
Interest expense				$ 8,200,000	$ 8,200,000
Interest rate				7%

Debt and letter of credit fac_5

Debt and letter of credit facilities - Summary of letter of credit facilities (Details) - Standby letters of credit	Dec. 31, 2022 USD ($)
Line of Credit Facility [Line Items]
Issued	$ 1,270,400,000
Cash and Cash Equivalents
Line of Credit Facility [Line Items]
Collateral	34,300,000
Debt Securities [Member]
Line of Credit Facility [Line Items]
Collateral	1,394,400,000
Committed - Secured letters of credit facilities
Line of Credit Facility [Line Items]
Committed Capacity	380,000,000
Issued	288,000,000
Committed - Secured letters of credit facilities | Cash and Cash Equivalents
Line of Credit Facility [Line Items]
Collateral	15,800,000
Committed - Secured letters of credit facilities | Debt Securities [Member]
Line of Credit Facility [Line Items]
Collateral	205,900,000
Uncommitted - Secured letters of credit facilities
Line of Credit Facility [Line Items]
Issued	982,400,000
Uncommitted - Secured letters of credit facilities | Cash and Cash Equivalents
Line of Credit Facility [Line Items]
Collateral	18,500,000
Uncommitted - Secured letters of credit facilities | Debt Securities [Member]
Line of Credit Facility [Line Items]
Collateral	$ 1,188,500,000

Income taxes - Income before in

Income taxes - Income before income tax by jurisdiction (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Domestic	$ (151.7)	$ 178.5	$ 113.6
Foreign	(270.8)	(133.5)	38.3
Income (loss) before income tax (expense) benefit	(422.7)	45.1	151.9
U.S.
Income Taxes [Line Items]
Foreign	(47)	21.8	38.1
U.K.
Income Taxes [Line Items]
Foreign	(9.7)	1.9	0.2
Sweden
Income Taxes [Line Items]
Foreign	(174.6)	(138.1)	0
Luxembourg
Income Taxes [Line Items]
Foreign	(37.2)	(20.5)	0
Other
Income Taxes [Line Items]
Foreign	$ (2.5)	$ 1.5	$ 0

Income taxes - Components of in

Income taxes - Components of income tax expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current tax (expense) benefit:
U.S. Federal	$ 1.6	$ (3.5)	$ (0.1)
State	(0.9)	(1.8)	0
Non-U.S.	(3.2)	(18.2)	0
Total current tax (expense) benefit	(2.5)	(23.5)	(0.1)
Deferred tax (expense) benefit:
U.S. Federal	20.7	(13.1)	(8)
State	2	(4.8)	0
Non-U.S.	16.5	52.1	0
Total deferred tax (expense) benefit	39.2	34.2	(8)
Total income tax (expense) benefit	$ 36.7	$ 10.7	$ (8.1)

Income taxes - Effective rate r

Income taxes - Effective rate reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax (expense) benefit at the 0% Bermuda statutory rate	$ 0	$ 0	$ 0
Differences in taxes resulting from:
Non-Bermuda earnings	52.9	17.6	(8)
Change in valuation allowance	(14.3)	10.5	0
Foreign currency effects	(10.7)	(19)	0
Change in uncertain tax positions	8	(8)	(0.1)
Provision-to-return true up	3.9	(0.5)	0
Tax rate change	2.7	4.3	0
Tax on Safety Reserve	(2.4)	(1)	0
Non-taxable/deductible income	(1.4)	7.2	0
Other, net	(1.3)	0.5	0
State taxes expense	(0.7)	(0.9)	0
Total income tax (expense) benefit	$ 36.7	$ 10.7	$ (8.1)

Income taxes - Narrative (Detai

Income taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Non-Bermuda pre-tax income (loss)	$ (270.8)	$ (133.5)	$ 38.3
Provision for taxes related to BEAT	0	0
Provision for taxes related to GILTI	0	0
Net deferred tax assets	140.5	86.6
Valuation allowance	114.3	113.3
Unrecognized tax benefits	2.3	10.7	1.6
Unrecognized tax benefits that would impact the effective tax rate	1.6
Interest expense on unrecognized tax benefits	0	0.1	0
Accrued interest on unrecognized tax benefits	0.7	0.7
Alternative minimum tax carryforwards
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0.1
U.S.
Operating Loss Carryforwards [Line Items]
Non-Bermuda pre-tax income (loss)	(47)	21.8	38.1
Net deferred tax assets	70.9
Valuation allowance	6.4
U.S. | Foreign tax credits carryforwards
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	8.1
U.S. | Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards subject to annual limitation under IRS Code Section 382	87.1
U.S. | Foreign | Expiring between 2023 and 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards subject to annual limitation under IRS Code Section 382	3
U.S. | Foreign | Expire between 2036 and 2039
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards subject to annual limitation under IRS Code Section 382	63
U.S. | Foreign | Do not expire
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards subject to annual limitation under IRS Code Section 382	21.1
Luxembourg
Operating Loss Carryforwards [Line Items]
Non-Bermuda pre-tax income (loss)	(37.2)	(20.5)	0
Net deferred tax assets	129.6
Valuation allowance	69.4
Luxembourg | Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	524.1
U.K.
Operating Loss Carryforwards [Line Items]
Non-Bermuda pre-tax income (loss)	(9.7)	1.9	0.2
Net deferred tax liabilities	5.2
Valuation allowance	38.5
Sweden
Operating Loss Carryforwards [Line Items]
Non-Bermuda pre-tax income (loss)	(174.6)	(138.1)	0
Net deferred tax liabilities	53.9
Sweden | Foreign tax credits carryforwards
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	7.8
Other
Operating Loss Carryforwards [Line Items]
Non-Bermuda pre-tax income (loss)	(2.5)	$ 1.5	$ 0
Net deferred tax liabilities	$ 0.9

Income taxes - Deferred tax ass

Income taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Non-U.S. net operating loss carryforwards	$ 301.1	$ 273.3
Unearned premiums	22.1	13.4
U.S. federal net operating loss and capital carryforwards	17.8	19.4
Purchase accounting	16.9	17.8
Tax credit carryforwards	16	26.2
Investment basis differences	10.7	5.9
Discounting of loss and loss adjustment expense reserves	9.3	7.6
Unrealized losses on investments	9	0
Incentive compensation and benefit accruals	5.8	5.7
Deferred interest	4.3	3.9
Allowance for doubtful accounts	4	2.9
Other items	4	5.2
Total gross deferred tax assets	421	381.3
Valuation allowance	(114.3)	(113.3)
Total adjusted deferred tax asset	306.7	268
Deferred tax liabilities:
Safety reserve	126.5	150.1
Deferred acquisition costs	22.5	6.7
Intangible assets	13.4	14.3
Foreign currency translation on investments	0.9	1.7
Unrealized gains on investments	0	3.8
Other Items	2.9	4.8
Total deferred tax liabilities	166.2	181.4
Net deferred tax assets	$ 140.5	$ 86.6

Income taxes - Net operating lo

Income taxes - Net operating loss and capital loss carryforwards (Details) $ in Millions	Dec. 31, 2022 USD ($)
Operating Loss Carryforwards [Line Items]
No expiration date	$ 1,207.1
Total	1,347.9
Gross deferred tax asset	319
Valuation allowance	(107)
Net deferred tax asset	212
2023-2027
Operating Loss Carryforwards [Line Items]
Subject to expiration	3
2028-2042
Operating Loss Carryforwards [Line Items]
Subject to expiration	137.8
U.S. | Foreign
Operating Loss Carryforwards [Line Items]
No expiration date	21.1
Total	87.1
Gross deferred tax asset	18
Valuation allowance	0
Net deferred tax asset	18
U.S. | 2023-2027 | Foreign
Operating Loss Carryforwards [Line Items]
Subject to expiration	3
U.S. | 2028-2042 | Foreign
Operating Loss Carryforwards [Line Items]
Subject to expiration	63
Luxembourg | Foreign
Operating Loss Carryforwards [Line Items]
No expiration date	723.6
Total	798.4
Gross deferred tax asset	199.1
Valuation allowance	(69.4)
Net deferred tax asset	129.7
Luxembourg | 2023-2027 | Foreign
Operating Loss Carryforwards [Line Items]
Subject to expiration	0
Luxembourg | 2028-2042 | Foreign
Operating Loss Carryforwards [Line Items]
Subject to expiration	74.8
Sweden | Foreign
Operating Loss Carryforwards [Line Items]
No expiration date	312.1
Total	312.1
Gross deferred tax asset	64.3
Valuation allowance	0
Net deferred tax asset	64.3
Sweden | 2023-2027 | Foreign
Operating Loss Carryforwards [Line Items]
Subject to expiration	0
Sweden | 2028-2042 | Foreign
Operating Loss Carryforwards [Line Items]
Subject to expiration	0
U.K. | Foreign
Operating Loss Carryforwards [Line Items]
No expiration date	150.3
Total	150.3
Gross deferred tax asset	37.6
Valuation allowance	(37.6)
Net deferred tax asset	0
U.K. | 2023-2027 | Foreign
Operating Loss Carryforwards [Line Items]
Subject to expiration	0
U.K. | 2028-2042 | Foreign
Operating Loss Carryforwards [Line Items]
Subject to expiration	$ 0

Income taxes - Reconciliation o

Income taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 10.7	$ 1.6
Acquisition of Sirius Group		0.9
Changes in prior year tax positions	(8.3)	(0.1)
Tax positions taken during the current year		8.3
Lapse in statute of limitations	(0.1)
Ending balance	2.3	10.7
Permanent differences
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	9.7	1.1
Acquisition of Sirius Group		0.7
Changes in prior year tax positions	(8)	(0.1)
Tax positions taken during the current year		8
Lapse in statute of limitations	(0.1)
Ending balance	1.6	9.7
Temporary differences
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	0.3	0
Acquisition of Sirius Group		0.1
Changes in prior year tax positions	(0.3)	(0.1)
Tax positions taken during the current year		0.3
Lapse in statute of limitations	0
Ending balance	0	0.3
Interest and penalties
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	0.7	0.5
Acquisition of Sirius Group		0.1
Changes in prior year tax positions	0	0.1
Tax positions taken during the current year		0
Lapse in statute of limitations	0
Ending balance	$ 0.7	$ 0.7

Shareholders' equity - Common s

Shareholders' equity - Common shares issued and outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement In Common Stock Issued and Outstanding [Roll Forward]
Common shares issued, beginning of year	161,929,777
Common shares outstanding, beginning of year	161,929,777
Options exercised	0
Common shares issued, end of year	162,177,653	161,929,777
Common shares outstanding, end of year	162,177,653	161,929,777
Common shares
Movement In Common Stock Issued and Outstanding [Roll Forward]
Common shares issued, beginning of year	161,929,777	95,582,733	94,225,498
Common shares outstanding, beginning of year	161,929,777	95,582,733	94,225,498
Shares repurchased	(695,047)	0	0
Options exercised	0	220,000	0
Issuance of common shares for Sirius Group acquisition	0	58,331,196	0
Issuance of common shares to related party	0	6,093,842	0
Common shares issued, end of year	162,177,653	161,929,777	95,582,733
Common shares outstanding, end of year	162,177,653	161,929,777	95,582,733
RSAs | Common shares
Movement In Common Stock Issued and Outstanding [Roll Forward]
Shares issued/granted, net of forfeitures and shares withheld	942,923	3,133,969	1,012,939
Performance shares | Common shares
Movement In Common Stock Issued and Outstanding [Roll Forward]
Shares issued/granted, net of forfeitures and shares withheld	0	(1,431,963)	344,296

Shareholders' equity - Narrativ

Shareholders' equity - Narrative (Details) $ / shares in Units, $ in Millions	2 Months Ended	12 Months Ended
	Aug. 12, 2021 shares	Dec. 31, 2022 USD ($) director period $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares	Feb. 28, 2018 USD ($)
Class of Stock [Line Items]
Common shares authorized (in shares) | shares		300,000,000
Common shares, par value (in dollars per share) | $ / shares		$ 0.10
Dividends paid to common shareholders		$ 0	$ 0	$ 0
Dividends paid to preference shareholders		16	$ 12.2	$ 0
Share repurchase program, authorized amount		200			$ 148.3
Common shares repurchased and retired		$ 5
Weighted average cost of common shares repurchased and retired (in dollars per share) | $ / shares		$ 7.17
Stock repurchase program, remaining authorized amount		$ 56.3
Common shares
Class of Stock [Line Items]
Common shares repurchased and retired (in shares) | shares		695,047	0	0
Common shares repurchased and retired		$ 0.1	$ 0	$ 0
Preference shares
Class of Stock [Line Items]
Preference shares, shares authorized (in shares) | shares		30,000,000
Preference shares, par value (in dollars per share) | $ / shares		$ 0.10
Series B preference shares
Class of Stock [Line Items]
Preference shares, shares authorized (in shares) | shares		8,000,000	8,000,000
Preference shares, par value (in dollars per share) | $ / shares		$ 0.10	$ 0.1
Preference shares, shares outstanding (in shares) | shares		8,000,000
Dividend rate		8%
Voting rights triggering event, number of dividend periods not paid | period		6
Voting rights triggered, number of directors eligible to elect | director		2
Dividend rate reset period		5 years
Each five-year anniversary triggering event, redemption percentage		100%
Rating agency triggering event, redemption percentage		102%
Capital disqualification triggering event, redemption percentage		100%
Tax triggering event, redemption percentage		100%
Dividends paid to preference shareholders		$ 16	$ 12.1
Series B preference shares | Public offering
Class of Stock [Line Items]
Shares sold (in shares) | shares	8,000,000
Series B preference shares | 5-year U.S. treasury rate
Class of Stock [Line Items]
Dividend rate basis spread on variable rate		7.298%

Share-based compensation and _3

Share-based compensation and employee benefit plans - Share-based compensation narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($) period shares	Dec. 31, 2022 USD ($) period shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future issuance (in shares) | shares	17,018,916	17,018,916	18,532,406
Share-based compensation expense		$ 26.8	$ 22.6	$ 6.6
Unamortized share compensation expense	$ 24.2	$ 24.2	$ 37
Unamortized share compensation expense, period of recognition		1 year 8 months 12 days	2 years 4 months 24 days
Options granted (in shares) | shares		2,905,709		0
Weighted average remaining contractual term for options outstanding		4 years	2 years
Weighted average remaining contractual term for options exercisable		1 year 7 months 6 days	2 years 1 month 6 days
Aggregate intrinsic value of options outstanding	0	$ 0	$ 0
Aggregate intrinsic value of options exercisable	$ 0	0	0
Proceeds from the exercise of stock options		$ 0	$ 2.2
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
RSUs | Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage	33.33%
RSUs | Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage	33.33%
RSUs | Tranche three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights percentage	33.33%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance periods | period	4	4

Share-based compensation and _4

Share-based compensation and employee benefit plans - RSU and restricted share award activity (Details)	12 Months Ended
	Dec. 31, 2022 $ / shares shares
RSUs
Number of non- vested restricted shares
Beginning of period (in shares) | shares	3,428,888
Granted (in shares) | shares	4,928,981
Forfeited (in shares) | shares	(1,214,252)
Vested (in shares) | shares	(1,982,204)
End of period (in shares) | shares	5,161,413
Weighted average grant date fair value
Beginning of period (in dollars per share) | $ / shares	$ 10.14
Granted (in dollars per share) | $ / shares	6.53
Forfeited (in dollars per share) | $ / shares	5.89
Vested (in dollars per share) | $ / shares	9.85
End of period (in dollars per share) | $ / shares	$ 7.29
RSAs
Number of non- vested restricted shares
Beginning of period (in shares) | shares	2,590,194
Granted (in shares) | shares	237,118
Forfeited (in shares) | shares	(292,989)
Vested (in shares) | shares	(825,715)
End of period (in shares) | shares	1,708,608
Weighted average grant date fair value
Beginning of period (in dollars per share) | $ / shares	$ 10.13
Granted (in dollars per share) | $ / shares	6.01
Forfeited (in dollars per share) | $ / shares	8.80
Vested (in dollars per share) | $ / shares	10.22
End of period (in dollars per share) | $ / shares	$ 7.40

Share-based compensation and _5

Share-based compensation and employee benefit plans - Performance share unit activity (Details) - Performance shares	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Number of non- vested PSUs
Beginning of period (in shares)	1,085,294
Granted (in shares)	0
Forfeited (in shares)	(495,502)
Vested (in shares)	(13,114)
End of period (in shares)	576,678
Number of non- vested PSUs probable of vesting
Beginning of period (in shares)	1,085,294
Granted (in shares)	0
Forfeited (in shares)	(495,502)
Vested (in shares)	(13,114)
End of period (in shares)	576,678
Weighted average grant date fair value of PSUs probable of vesting
Beginning of period (in dollars per share) | $ / shares	$ 10.30
Granted (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	10.33
Vested (in dollars per share) | $ / shares	10.36
End of period (in dollars per share) | $ / shares	$ 9.85

Share-based compensation and _6

Share-based compensation and employee benefit plans - Valuation assumptions for options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)	$ 1.93	$ 3.28
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0%	0%
Risk free interest rate	3.57%	1.55%
Expected volatility	32.30%	34.17%
Expected life (in years)	6 years 3 months 18 days	6 years 6 months

Share-based compensation and _7

Share-based compensation and employee benefit plans - Options activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020
Number of options
Beginning of period (in shares)	7,087,095
Granted (in shares)	2,905,709	0
Forfeited and expired (in shares)	(4,650,065)
Exercised (in shares)	0
End of period (in shares)	5,342,739
Options exercisable (in shares)	2,781,527
Weighted average exercise price
Beginning of period (in dollars per share)	$ 12.61
Granted (in dollars per share)	6.94
Forfeited and expired (in dollars per share)	12.92
Exercised (in dollars per share)	0
End of period (in dollars per share)	9.25
Options exercisable, weighted average exercise price (in dollars per share)	$ 11.01

Share-based compensation and _8

Share-based compensation and employee benefit plans - Defined benefit plans narrative (Details) - SiriusPoint International - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 18.3	$ 20.4
Funded (unfunded) status	6	2.3
Accumulated benefit obligation	13.5	20.4
Sweden
Defined Benefit Plan Disclosure [Line Items]
Funded (unfunded) status	7.6	6
Germany
Defined Benefit Plan Disclosure [Line Items]
Funded (unfunded) status	$ (1.6)	$ (3.7)

Share-based compensation and _9

Share-based compensation and employee benefit plans - Defined contribution plans narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items]
Expenses related to defined contribution plans	$ 6.1	$ 6.9	$ 0.9
United Kingdom | SiriusPoint International
Defined Contribution Plan Disclosure [Line Items]
Employer contribution, percentage of employee's salary	12%
Belgium | Minimum | SiriusPoint International
Defined Contribution Plan Disclosure [Line Items]
Employer contribution, percentage of employee's salary	6.50%
Belgium | Maximum | SiriusPoint International
Defined Contribution Plan Disclosure [Line Items]
Employer contribution, percentage of employee's salary	8.50%
Switzerland | Minimum | SiriusPoint International
Defined Contribution Plan Disclosure [Line Items]
Employer premium, percentage	60%
Employee premium, percentage	30%
Switzerland | Maximum | SiriusPoint International
Defined Contribution Plan Disclosure [Line Items]
Employer premium, percentage	70%
Employee premium, percentage	40%
Sweden | Minimum | SiriusPoint International
Defined Contribution Plan Disclosure [Line Items]
Employer contribution, percentage of employee's salary	5.50%
Sweden | Maximum | SiriusPoint International
Defined Contribution Plan Disclosure [Line Items]
Employer contribution, percentage of employee's salary	31.30%

Earnings (loss) per share ava_3

Earnings (loss) per share available to SiriusPoint common shareholders - Computation of basic and diluted earnings per share available to SiriusPoint common shareholders (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted-average number of common shares outstanding:
Basic number of common shares outstanding (in shares)	160,228,588	148,667,770	92,510,090
Dilutive effect of warrants (in shares)	0	0	0
Diluted number of common shares outstanding (in shares)	160,228,588	150,156,466	92,957,799
Basic earnings (loss) per common share:
Net income (loss) available to SiriusPoint common shareholders	$ (402.8)	$ 44.6	$ 143.5
Net income allocated to SiriusPoint participating common shareholders	0	(3.4)	(1.1)
Net income (loss) allocated to SiriusPoint common shareholders	$ (402.8)	$ 41.2	$ 142.4
Basic earnings per share available to SiriusPoint common shareholders (in dollars per share)	$ (2.51)	$ 0.28	$ 1.54
Diluted earnings (loss) per common share:
Net income (loss) available to SiriusPoint common shareholders	$ (402.8)	$ 44.6	$ 143.5
Net income allocated to SiriusPoint participating common shareholders	0	(3.4)	(1.1)
Net income (loss) allocated to SiriusPoint common shareholders	$ (402.8)	$ 41.2	$ 142.4
Diluted earnings per share available to SiriusPoint common shareholders (in dollars per share)	$ (2.51)	$ 0.27	$ 1.53
Options
Weighted-average number of common shares outstanding:
Dilutive effect of share-based payment awards (in shares)	0	0	0
Restricted share units
Weighted-average number of common shares outstanding:
Dilutive effect of share-based payment awards (in shares)	0	1,488,696	447,709

Earnings (loss) per share ava_4

Earnings (loss) per share available to SiriusPoint common shareholders - Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	4,257,266	7,087,095	3,741,266
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	31,123,755	31,123,755	3,494,979
Upside rights
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		10,000,000

Related party transactions - Na

Related party transactions - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022	Feb. 23, 2022	Mar. 01, 2021	Feb. 26, 2021	Aug. 06, 2020	Jan. 01, 2019
Certain insurance and MGA related parties
Related Party Transaction [Line Items]
Receivables from affiliates	$ 59,600,000	$ 35,600,000
Payables to affiliates	4,600,000	0
Affiliated entity | Certain insurance and MGA related parties
Related Party Transaction [Line Items]
Gross written premiums	336,400,000	$ 214,000,000
Affiliated entity | Third Point LLC, 2022 LPA
Related Party Transaction [Line Items]
Withdrawals to be reinvested or contractually committed	$ 350,000,000
Affiliated entity | Management fees | Third Point LLC, 2022 LPA
Related Party Transaction [Line Items]
Fee percentage				1.25%
Affiliated entity | Management fees | Third Point LLC, 2019 LPA
Related Party Transaction [Line Items]
Fee percentage								1.25%
Affiliated entity | Management fees | Third Point LLC, 2020 LPA
Related Party Transaction [Line Items]
Fee percentage							1.25%
Affiliated entity | Management fees | Third Point LLC, 2022 Venture II LPA
Related Party Transaction [Line Items]
Fee percentage			0.75%
Affiliated entity | Management fees | Third Point LLC, TPIPS IMA
Related Party Transaction [Line Items]
Fee percentage						0.06%
Affiliated entity | Management fees | Third Point LLC, 2022 IMA
Related Party Transaction [Line Items]
Fee percentage				0.50%
Affiliated entity | Performance fees | TP GP
Related Party Transaction [Line Items]
Fee percentage								20%
Affiliated entity | Performance fees | TP Venture GP
Related Party Transaction [Line Items]
Fee percentage					20%
Affiliated entity | Performance fees | TP Venture GP II
Related Party Transaction [Line Items]
Fee percentage			20%
Affiliated entity | Advisory fees | Third Point LLC, 2022 IMA
Related Party Transaction [Line Items]
Fee amount				$ 1,500,000
Affiliated entity | Inventive fees | Third Point LLC, 2022 IMA
Related Party Transaction [Line Items]
Fee percentage				15%

Related party transactions - In

Related party transactions - Investments managed by related parties (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Investments in related party investment funds, at fair value	$ 128.8	$ 909.6
Total investments	5,653.7	4,529.9
Affiliated entity
Related Party Transaction [Line Items]
Investments in related party investment funds, at fair value	128.8	909.6
Third Point Optimized Credit Portfolio	530.7	0
Total investments	659.5	909.6
Affiliated entity | Asset-backed securities withdrawn as redemption-in-kind
Related Party Transaction [Line Items]
Third Point Optimized Credit Portfolio	59.9
Affiliated entity | Third Point Enhanced LP
Related Party Transaction [Line Items]
Investments in related party investment funds, at fair value	100.3	878.2
Affiliated entity | Third Point Venture Offshore Fund I LP
Related Party Transaction [Line Items]
Investments in related party investment funds, at fair value	26	31.4
Affiliated entity | Third Point Venture Offshore Fund II LP
Related Party Transaction [Line Items]
Investments in related party investment funds, at fair value	$ 2.5	$ 0

Related party transactions - Su

Related party transactions - Summary of management and performance fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 06, 2020
Related Party Transaction [Line Items]
Total management and performance fees to related parties	$ 6.1	$ 93.6	$ 79.8
Management and advisory fees
Related Party Transaction [Line Items]
Total management and performance fees to related parties	7.3	17.9	14.5
Performance fees - fixed income and other investments
Related Party Transaction [Line Items]
Total management and performance fees to related parties	0	0	14
Performance fees - fixed income and other investments | Third Point LLC, 2020 LPA | Affiliated entity
Related Party Transaction [Line Items]
Fee percentage				20%
Performance fees (before loss carryforward)
Related Party Transaction [Line Items]
Total management and performance fees to related parties	(1.2)	75.7	51.8
Performance fees - loss carryforward utilized
Related Party Transaction [Line Items]
Total management and performance fees to related parties	$ 0	$ 0	$ (0.5)

Commitments and contingencies -

Commitments and contingencies - Premiums written by source that individually contributed more than 10% of the total (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Gross premiums written	$ 3,409.7	$ 2,236.5	$ 588.5
Gross premiums written | Credit concentration risk
Concentration Risk [Line Items]
Gross premiums written	$ 3,409.7	$ 2,236.5	$ 588.5
% of total	100%	100%	100%
Gross premiums written | Credit concentration risk | Aon Corporation and subsidiaries
Concentration Risk [Line Items]
Gross premiums written	$ 625.5	$ 536.6	$ 189.1
% of total	18.30%	24%	32.10%
Gross premiums written | Credit concentration risk | Guy Carpenter & Company and subsidiaries
Concentration Risk [Line Items]
Gross premiums written	$ 441.9	$ 414.1	$ 164.6
% of total	13%	18.50%	28%
Gross premiums written | Credit concentration risk | Arthur J. Gallagher & Co. and subsidiaries
Concentration Risk [Line Items]
Gross premiums written	$ 216.8	$ 244.2	$ 67.6
% of total	6.40%	10.90%	11.50%
Gross premiums written | Credit concentration risk | Other
Concentration Risk [Line Items]
Gross premiums written	$ 2,125.5	$ 1,041.6	$ 167.2
% of total	62.30%	46.60%	28.40%

Commitments and contingencies_2

Commitments and contingencies - Narrative (Details) - USD ($)			3 Months Ended	12 Months Ended
	Mar. 07, 2022	Sep. 16, 2020	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jul. 02, 2021
Related Party Transaction [Line Items]
Restructuring costs incurred			$ 30,000,000
Restructuring, Incurred Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]			Net corporate and other expenses
Operating lease expense				$ 12,800,000	$ 10,500,000	$ 900,000
Operating lease right-of-use assets			$ 25,900,000	$ 25,900,000	$ 27,400,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]			Other assets	Other assets	Other assets
Operating lease liabilities			$ 30,300,000	$ 30,300,000	$ 32,500,000
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]			Accounts payable, accrued expenses and other liabilities	Accounts payable, accrued expenses and other liabilities	Accounts payable, accrued expenses and other liabilities
Affiliated entity
Related Party Transaction [Line Items]
Interest rate		8%
Amount drawn			$ 0	$ 0
Loans receivable							$ 11,500,000
Additional funding provided				1,400,000
Proceeds from repayment of loan				300,000
Player's Health
Related Party Transaction [Line Items]
Amount lent under note agreement	$ 8,000,000
Notes receivable, interest rate	6%
Contributions to Central Fund | Lloyd's Central Fund
Related Party Transaction [Line Items]
Commitment amount			$ 600,000	$ 600,000
Percentage of gross premiums written				0.35%
Maximum additional contribution, percentage				5%
Commitments to Extend Credit | Affiliated entity
Related Party Transaction [Line Items]
Commitment amount		$ 18,000,000

Commitments and contingencies_3

Commitments and contingencies - Lease balances (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Operating lease right-of-use assets	$ 25.9	$ 27.4
Operating lease liabilities	$ 30.3	$ 32.5
Weighted average lease term (years)	5 years 6 months	5 years
Weighted average discount rate	3.10%	2.40%

Commitments and contingencies_4

Commitments and contingencies - Future minimum rental commitments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
2023	$ 9.2
2024	5.9
2025	4.6
2026	3.7
2027 and thereafter	9.7
Total future annual minimum rental payments	33.1
Less: present value discount	(2.8)
Total lease liability	$ 30.3	$ 32.5

Statutory requirements - Narrat

Statutory requirements - Narrative (Details) £ in Millions, kr in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) subsidiary member	Dec. 31, 2022 GBP (£)	Dec. 31, 2022 SEK (kr)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 SEK (kr) subsidiary member
Statutory Accounting Practices [Line Items]
Dividends paid to common shareholders	$ 0			$ 0	$ 0
Bermuda
Statutory Accounting Practices [Line Items]
Liquidity ratio, minimum percentage required	75%					75%
Statutory maximum percentage of prior year statutory capital and surplus available for dividend payments without approval	25%					25%
Number of members of the Board of Directors required to approve dividend payments in excess of the maximum percentage | member	2					2
Amount available for dividend payments without regulatory approval	$ 713.5			844.4
United Kingdom
Statutory Accounting Practices [Line Items]
Lloyds approved net capacity	107.5	£ 89
Sweden | SiriusPoint International
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	(69.6)			289.5
Statutory amount available for dividend payments	437.4			560.3
Dividends paid with approval	2.3		kr 25.1
Safety Reserve	600					kr 6,000
Deferred tax liability related to the Safety Reserve, payable if failing to maintain prescribed levels of premium writings and loss reserves	118.9
U.S. | SiriusPoint America
Statutory Accounting Practices [Line Items]
Amount available for dividend payments without regulatory approval	9.9			11
Statutory net income (loss)	(56.2)			28.9
Risk-based capital requirements authorized control level	152.2
Statutory surplus	508.8			581.5
Earned surplus	9.9			69
Dividends paid without approval	0
U.S. | Sirius Specialty
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	(8.1)			(7.1)
Risk-based capital requirements authorized control level	9.2
Statutory surplus	57			55.2
U.S. | Oakwood
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	(0.2)			(0.4)
Risk-based capital requirements authorized control level	0.3
Statutory surplus	$ 39.4			$ 39.7
Bermuda
Statutory Accounting Practices [Line Items]
Number of insurance subsidiaries | subsidiary	2					2

Statutory requirements - Summar

Statutory requirements - Summary of statutory information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Bermuda | SiriusPoint Ltd.
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus		$ 3,119.1
Required statutory capital and surplus(1)		1,558.3
Bermuda | SiriusPoint Bermuda
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus		3,333.5
Required statutory capital and surplus(1)		1,531.6
Statutory net income (loss)	$ (360.1)	90.6
Bermuda | Alstead Re
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus		4.6
Required statutory capital and surplus(1)		1.6
Statutory net income (loss)	0.9	(0.4)
U.S. | SiriusPoint America
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	508.8	581.5
Required statutory capital and surplus(1)	152.2	112.4
Statutory net income (loss)	(56.2)	28.9
U.S. | Sirius Specialty
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	57	55.2
Required statutory capital and surplus(1)	46	47
Statutory net income (loss)	(8.1)	(7.1)
U.S. | Oakwood
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	39.4	39.7
Required statutory capital and surplus(1)	7.5	7.5
Statutory net income (loss)	$ (0.2)	$ (0.4)

Schedule I - Summary of inves_2

Schedule I - Summary of investments - Other Than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2022 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	$ 5,453.5
Fair value	5,323.7
Balance sheet value	5,323.7
Debt securities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	2,678.1
Fair value	2,635.5
Balance sheet value	2,635.5
Debt securities, trading
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	1,630.1
Fair value	1,526
Balance sheet value	1,526
Asset-backed securities | Debt securities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	234.1
Fair value	230.7
Balance sheet value	230.7
Asset-backed securities | Debt securities, trading
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	575.5
Fair value	553.7
Balance sheet value	553.7
Residential mortgage-backed securities | Debt securities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	354.3
Fair value	340.7
Balance sheet value	340.7
Residential mortgage-backed securities | Debt securities, trading
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	155.9
Fair value	133.6
Balance sheet value	133.6
Commercial mortgage-backed securities | Debt securities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	62.1
Fair value	61.2
Balance sheet value	61.2
Commercial mortgage-backed securities | Debt securities, trading
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	130.5
Fair value	113.4
Balance sheet value	113.4
Bank debt | Debt securities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	0
Fair value	0
Balance sheet value	0
Corporate debt securities | Debt securities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	428.5
Fair value	415.7
Balance sheet value	415.7
Corporate debt securities | Debt securities, trading
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	391.4
Fair value	363.5
Balance sheet value	363.5
U.S. government and government agency | Debt securities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	1,561.9
Fair value	1,550.6
Balance sheet value	1,550.6
U.S. government and government agency | Debt securities, trading
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	278.6
Fair value	270.4
Balance sheet value	270.4
Non-U.S. government and government agency | Debt securities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	37.2
Fair value	36.6
Balance sheet value	36.6
Non-U.S. government and government agency | Debt securities, trading
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	95.8
Fair value	88.2
Balance sheet value	88.2
Preferred stocks | Debt securities, trading
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	2.4
Fair value	3.2
Balance sheet value	3.2
Total short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	984.5
Fair value	984.6
Balance sheet value	984.6
Total equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	1.8
Fair value	1.6
Balance sheet value	1.6
Other long-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or amortized cost	159
Fair value	176
Balance sheet value	$ 176

Schedule II - Condensed Finan_2

Schedule II - Condensed Financial Information of Registrant - Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets
Total investments	$ 5,653.7	$ 4,529.9
Cash and cash equivalents	705.3	999.8
Other assets	157.9	126.8
Total assets	11,036.3	10,618.3
Liabilities
Accounts payable, accrued expenses and other liabilities	266.6	229.8
Liability-classified capital instruments	60.4	87.8
Debt	778	816.7
Total liabilities	8,953.7	8,115
Shareholders’ equity
Common shares	16.2	16.2
Additional paid-in capital	1,641.3	1,622.7
Retained earnings	262.2	665
Accumulated other comprehensive loss	(45)	(0.2)
Shareholders’ equity attributable to SiriusPoint shareholders	2,074.7	2,503.7
Total liabilities, noncontrolling interests and shareholders’ equity	11,036.3	10,618.3
Series B preference shares
Shareholders’ equity
Series B preference shares	200	200
Parent Company
Assets
Total investments	19.4	13
Cash and cash equivalents	5.6	7.9
Investment in subsidiaries	2,875.9	3,405.6
Amounts due from affiliates	14.7	0
Other assets	12.8	12.7
Total assets	2,928.4	3,439.2
Liabilities
Accounts payable, accrued expenses and other liabilities	15.3	17.4
Amounts due to affiliates	0	13.6
Liability-classified capital instruments	60.4	87.8
Debt	778	816.7
Total liabilities	853.7	935.5
Shareholders’ equity
Common shares	16.2	16.2
Additional paid-in capital	1,641.3	1,622.7
Retained earnings	262.2	665
Accumulated other comprehensive loss	(45)	(0.2)
Shareholders’ equity attributable to SiriusPoint shareholders	2,074.7	2,503.7
Total liabilities, noncontrolling interests and shareholders’ equity	2,928.4	3,439.2
Parent Company | Series B preference shares
Shareholders’ equity
Series B preference shares	$ 200	$ 200

Schedule II - Condensed Finan_3

Schedule II - Condensed Financial Information of Registrant - Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net realized and unrealized investment gains (losses) and net investment income	$ (322.7)	$ 312.5	$ 278.9
Other revenues	110.2	151.2	0
Total revenues	2,105.6	2,180.7	889.7
Expenses
Net corporate and other expenses	312.8	266.6	41.9
Interest expense	38.6	34	8.2
Foreign exchange gains	(66)	(44)	5.2
Total expenses	2,528.3	2,135.6	737.8
Income (loss) before income tax (expense) benefit	(422.7)	45.1	151.9
Income tax (expense) benefit	36.7	10.7	(8.1)
Net income (loss) available to SiriusPoint	(386.8)	58.1	143.5
Dividends on Series B preference shares	(16)	(13.5)	0
Net income (loss) available to SiriusPoint common shareholders, baisc	(402.8)	44.6	143.5
Net income (loss) available to SiriusPoint common shareholders, diluted	(402.8)	44.6	143.5
Parent Company
Revenues
Net realized and unrealized investment gains (losses) and net investment income	6.4	1.3	0
Other revenues	30.6	100.2	0
Equity in earnings (losses) of subsidiaries	(360.2)	90.1	169.9
Total revenues	(323.2)	191.6	169.9
Expenses
Net corporate and other expenses	64.9	109.5	26.4
Interest expense	38.6	34	0
Foreign exchange gains	(38.1)	(18.2)	0
Total expenses	65.4	125.3	26.4
Income (loss) before income tax (expense) benefit	(388.6)	66.3	143.5
Income tax (expense) benefit	1.8	(8.2)	0
Net income (loss) available to SiriusPoint	(386.8)	58.1	143.5
Dividends on Series B preference shares	(16)	(13.5)	0
Net income (loss) available to SiriusPoint common shareholders, baisc	(402.8)	44.6	143.5
Net income (loss) available to SiriusPoint common shareholders, diluted	$ (402.8)	$ 44.6	$ 143.5

Schedule II - Condensed Finan_4

Schedule II - Condensed Financial Information of Registrant - Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Comprehensive income (loss)
Net income (loss) available to SiriusPoint	$ (386.8)	$ 58.1	$ 143.5
Other comprehensive loss
Change in foreign currency translation	(5)	(0.2)	0
Unrealized gains (losses) from debt securities held as available for sale investments	(42.5)	0	0
Comprehensive income (loss) available to SiriusPoint	(431.6)	57.9	143.5
Parent Company
Comprehensive income (loss)
Net income (loss) available to SiriusPoint	(386.8)	58.1	143.5
Other comprehensive loss
Change in foreign currency translation	(5)	(0.2)	0
Unrealized gains (losses) from debt securities held as available for sale investments	(42.5)	0	0
Reclassifications from accumulated other comprehensive income	2.7	0	0
Total other comprehensive loss	(44.8)	(0.2)	0
Comprehensive income (loss) available to SiriusPoint	$ (431.6)	$ 57.9	$ 143.5

Schedule II - Condensed Finan_5

Schedule II - Condensed Financial Information of Registrant - Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income (loss) available to SiriusPoint	$ (386.8)	$ 58.1	$ 143.5
Adjustments to reconcile net income available to SiriusPoint to net cash provided by operating activities:
Share compensation	30.5	11.4	6.6
Net realized and unrealized (gain) loss on investments and derivatives	207.6	3	(62.5)
Amortization of premium and accretion of discount, net	(17.2)	9.5	(3.8)
Other revenues	(27.4)	(100.1)	0
Other items, net	(33.8)	(22.6)	6.1
Changes in assets and liabilities:
Other assets	(36.9)	34.8	(4.6)
Accounts payable, accrued expenses and other liabilities	36.8	(25.5)	(3.3)
Net cash provided by operating activities	293.3	1.6	73.3
Investing activities
Purchases of investments	(6,161.3)	(3,409.6)	(431.2)
Proceeds from sales and maturities of investments	4,110.7	2,687.9	532.2
Acquisition of Sirius Group	0	631.9	0
Net cash provided by (used in) investing activities	(1,304.3)	208.6	6
Financing activities
Proceeds from issuance of SiriusPoint common shares, net of costs	0	50.8	0
Taxes paid on withholding shares	(7.1)	(0.5)	(0.3)
Purchases of SiriusPoint common shares under share repurchase program	(5)	0	0
Cash dividends paid to preference shareholders	(16)	(12.2)	0
Net cash provided by (used in) financing activities	(23.7)	24.3	(19.4)
Net increase (decrease) in cash, cash equivalents and restricted cash	(1,034.7)	234.5	59.9
Cash, cash equivalents and restricted cash at beginning of year	1,948.4	1,713.9	1,654
Cash, cash equivalents and restricted cash at end of year	913.7	1,948.4	1,713.9
Parent Company
Operating activities
Net income (loss) available to SiriusPoint	(386.8)	58.1	143.5
Adjustments to reconcile net income available to SiriusPoint to net cash provided by operating activities:
Equity in (earnings) losses of subsidiaries	360.2	(90.1)	(169.9)
Dividend received by parent	125	74	135.2
Share compensation	30.6	11.7	0.7
Net realized and unrealized (gain) loss on investments and derivatives	(6.4)	(1.3)	0
Amortization of premium and accretion of discount, net	(0.5)	(0.7)	0
Other revenues	(27.4)	(100.1)	0
Other items, net	(38)	(25.4)	0
Changes in assets and liabilities:
Other assets	(0.1)	0.8	(4.2)
Accounts payable, accrued expenses and other liabilities	(2.5)	15.8	(2.4)
Amounts due from (to) affiliates	(28.3)	86.1	(102.3)
Net cash provided by operating activities	25.8	28.9	0.6
Investing activities
Purchases of investments	0	(11.8)	0
Proceeds from sales and maturities of investments	0	4.1	0
Acquisition of Sirius Group	0	(51.6)	0
Net cash provided by (used in) investing activities	0	(59.3)	0
Financing activities
Proceeds from issuance of SiriusPoint common shares, net of costs	0	50.8	0
Taxes paid on withholding shares	(7.1)	(0.5)	(0.4)
Purchases of SiriusPoint common shares under share repurchase program	(5)	0	0
Cash dividends paid to preference shareholders	(16)	(12.2)	0
Net cash provided by (used in) financing activities	(28.1)	38.1	(0.4)
Net increase (decrease) in cash, cash equivalents and restricted cash	(2.3)	7.7	0.2
Cash, cash equivalents and restricted cash at beginning of year	7.9	0.2	0
Cash, cash equivalents and restricted cash at end of year	$ 5.6	$ 7.9	$ 0.2

Schedule III - Supplementary _2

Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred acquisition costs and value of business acquired, net	$ 294.9	$ 218.8	$ 68.6
Loss and loss adjustment expense reserves	5,268.7	4,841.4	1,310.1
Unearned premium	1,521.1	1,198.4	284.8
Net premiums earned	2,318.1	1,717	610.8
Total realized and unrealized investment gains (losses) and net investment income	(322.7)	312.5	278.9
Loss and loss adjustment expenses incurred, net	1,588.4	1,326.5	465.3
Acquisition costs, net	461.9	387.8	187.1
Other underwriting expenses	184.5	158.8	30.1
Net premiums written	2,549.2	1,734.2	542.2
Corporate & Eliminations
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred acquisition costs and value of business acquired, net	0.1	0.1	0
Loss and loss adjustment expense reserves	688	894.6	219.7
Unearned premium	0.4	12.5	3.4
Net premiums earned	18.2	(16.7)	28.1
Total realized and unrealized investment gains (losses) and net investment income	(316.6)	317	278.9
Loss and loss adjustment expenses incurred, net	13.8	6.3	(0.1)
Acquisition costs, net	(121.6)	(64.6)	25.3
Other underwriting expenses	7.9	24.1	5.9
Net premiums written	3.6	(43.5)	28.9
Reinsurance | Operating Segments
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred acquisition costs and value of business acquired, net	175.7	147.5	69.5
Loss and loss adjustment expense reserves	3,512.2	3,435.7	1,084.1
Unearned premium	843.9	687.5	261.9
Net premiums earned	1,213.1	1,210.9	575.6
Total realized and unrealized investment gains (losses) and net investment income	(3.9)	0.3	0
Loss and loss adjustment expenses incurred, net	855.9	999.6	459.5
Acquisition costs, net	310.3	302.7	160.4
Other underwriting expenses	113.8	105.5	24
Net premiums written	1,199.6	1,124.9	497.3
Insurance & Services | Operating Segments
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred acquisition costs and value of business acquired, net	119.1	71.2	(0.9)
Loss and loss adjustment expense reserves	1,068.5	511.1	6.3
Unearned premium	676.8	498.4	19.5
Net premiums earned	1,086.8	522.8	7.1
Total realized and unrealized investment gains (losses) and net investment income	(2.2)	(4.8)	0
Loss and loss adjustment expenses incurred, net	718.7	320.6	5.9
Acquisition costs, net	273.2	149.7	1.4
Other underwriting expenses	62.8	29.2	0.2
Net premiums written	$ 1,346	$ 652.8	$ 16

Schedule IV - Reinsurance (Deta

Schedule IV - Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]
Direct premiums written	$ 1,403.9	$ 718	$ 19
Ceded to other companies	860.5	502.3	46.3
Assumed from other companies	2,005.8	1,518.5	569.5
Net premiums written	$ 2,549.2	$ 1,734.2	$ 542.2
Percentage of amount assumed to net	78.70%	87.60%	105%

Schedule VI - Supplementary I_2

Schedule VI - Supplementary Information for Property-Casualty Insurance Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]
Deferred acquisition costs and value of business acquired, net	$ 294.9	$ 218.8	$ 68.6
Loss and loss adjustment expense reserves	5,268.7	4,841.4	1,310.1
Unearned premium reserves	1,521.1	1,198.4	284.8
Net premiums earned	2,318.1	1,717	610.8
Total realized and unrealized investment gains (losses) and net investment income	(322.7)	312.5	278.9
Loss and loss expenses incurred related to current year	1,609.7	1,369.1	431.5
Loss and loss expenses incurred related to prior year	(21.3)	(42.6)	33.8
Acquisition costs, net	461.9	387.8	187.1
Net paid losses and loss expenses	1,255.3	1,450.1	283.1
Net premiums written	$ 2,549.2	$ 1,734.2	$ 542.2