Sirius International Insurance 10-Q 8 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Document and Entity Information
Entity Registrant Name	Sirius International Insurance Group, Ltd.
Entity Central Index Key	0001744894
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		115,299,342
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Assets
Fixed maturity investments, trading, at fair value (Amortized cost 2019: $1,702.1; 2018: $1,952.9)	$ 1,771.4	$ 1,949.2
Short-term investments, at fair value (Amortized cost 2019: $981.5; 2018: $716.1)	989.3	715.5
Equity securities, trading, at fair value (Cost 2019: $359.4; 2018: $409.4)	384.3	380
Other long-term investments, at fair value (Cost 2019: $332.6; 2018: $337.6)	368.4	365
Cash	145.8	119.4
Restricted cash	14	12.8
Total investments and cash	3,673.2	3,541.9
Accrued investment income	11.5	14.1
Insurance and reinsurance premiums receivable	842.6	630.6
Reinsurance recoverable on unpaid losses	392.9	350.2
Reinsurance recoverable on paid losses	55.2	55
Funds held by ceding companies	236.8	186.8
Ceded unearned insurance and reinsurance premiums	173.8	159.8
Deferred acquisition costs	155.2	141.6
Deferred tax asset	162.8	202.5
Accounts receivable on unsettled investment sales	12.9	5
Goodwill	400.4	400.6
Intangible assets	183.8	195.6
Other assets	164	124
Total assets	6,465.1	6,007.7
Liabilities
Loss and loss adjustment expense reserves	2,186.4	2,016.7
Unearned insurance and reinsurance premiums	807.7	647.2
Ceded reinsurance payable	250.4	206.9
Funds held under reinsurance treaties	135.9	110.6
Deferred tax liability	208.6	237.4
Debt	670.3	696.8
Accounts payable on unsettled investment purchases	34.7	3.2
Other liabilities	189.1	150.5
Total liabilities	4,483.1	4,069.3
Commitments and contingencies (see Note 18)
Mezzanine equity
Series B preference shares	236	232.2
Common shareholders' equity
Common shares (shares issued and outstanding, 2019: 115,299,342; 2018: 115,151,251)	1.2	1.2
Additional paid-in surplus	1,097	1,089.1
Retained earnings	915.8	816.6
Accumulated other comprehensive (loss)	(271.4)	(202.4)
Total common shareholders' equity	1,742.6	1,704.5
Non-controlling interests	3.4	1.7
Total equity	1,746	1,706.2
Total liabilities, mezzanine equity, and equity	$ 6,465.1	$ 6,007.7

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Fixed maturity investments, trading, amortized cost	$ 1,702.1	$ 1,952.9
Short-term investments, amortized cost	981.5	716.1
Equity securities, at cost	359.4	409.4
Other long-term investments, cost	$ 332.6	$ 337.6
Shares issued (in shares)	115,299,342	115,151,251
Shares outstanding (in shares)	115,299,342	115,151,251

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Net earned insurance and reinsurance premiums	$ 374.2	$ 321.1	$ 1,056.8	$ 914.5
Net investment income	22.8	21.8	67.3	51.8
Net realized investment gains	15.3	3.9	39.9	8
Net unrealized investment gains (losses)	53.9	(11.7)	143.4	29
Net foreign exchange gains (losses)	4.9	(0.4)	9.4	21.7
Other revenue	16.3	17	51.3	96
Total revenues	487.4	351.7	1,368.1	1,121
Expenses
Loss and loss adjustment expenses	348.6	260.4	810.5	552.8
Insurance and reinsurance acquisition expenses	75.1	59.2	215.4	189
Other underwriting expenses	35.4	35.7	106.2	117.1
General and administrative expenses	28	19.5	80.6	58
Intangible asset amortization expenses	3.9	3.9	11.8	11.8
Interest expense on debt	7.7	7.6	23.3	23.1
Total expenses	498.7	386.3	1,247.8	951.8
Pre-tax (loss) income	(11.3)	(34.6)	120.3	169.2
Income tax benefit (expense)	3.7	6.9	(15.6)	(55.4)
Net income (loss)	(7.6)	(27.7)	104.7	113.8
Income attributable to non-controlling interests	(0.4)	(0.3)	(1.6)	(0.9)
(Loss) income attributable to Sirius Group	(8)	(28)	103.1	112.9
Change in carrying value of Series B preference shares	5.3	0	(3.9)	0
Accrued dividends on Series A redeemable preference shares	0	0	0	(2.6)
Net (loss) income attributable to Sirius Group's common shareholders	$ (2.7)	$ (28)	$ 99.2	$ 110.3
Net (loss) income per common share and common share equivalent
Basic earnings per common share and common share equivalent (in usd per share)	$ (0.02)	$ (0.23)	$ 0.78	$ 0.88
Diluted earnings per common share and common share equivalent (in usd per share)	$ (0.06)	$ (0.23)	$ 0.78	$ 0.88
Weighted average number of common shares and common share equivalents outstanding:
Basic weighted average number of common shares and common share equivalents outstanding (in shares)	115,251,853	120,000,000	115,225,942	120,000,000
Diluted weighted average number of common shares and common share equivalents outstanding	127,153,523	120,000,000	115,619,222	120,000,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive (loss) income
Net (loss) income	$ (7.6)	$ (27.7)	$ 104.7	$ 113.8
Other comprehensive (loss) income
Change in foreign currency translation, net of tax	(42.3)	4.7	(69)	(57.2)
Total other comprehensive (loss) income	(42.3)	4.7	(69)	(57.2)
Comprehensive (loss) income	(49.9)	(23)	35.7	56.6
Net (income) attributable to non-controlling interests	(0.4)	(0.3)	(1.6)	(0.9)
Comprehensive (loss) income attributable to Sirius Group	$ (50.3)	$ (23.3)	$ 34.1	$ 55.7

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common shares	Additional paid-in surplus	Retained earnings	Accumulated other comprehensive (loss)
Changes in common shareholders' equity
Non-controlling interests	$ 0.2
Beginning Balance at Dec. 31, 2017		$ 1.2	$ 1,197.9	$ 858.4	$ (140.5)
Changes in common shareholders' equity
Capital contribution from former parent			1.4
Net (loss) income				113.8
Income attributable to non-controlling interests				(0.9)
Accrued dividends on Series A redeemable preference shares	(2.6)			(2.6)
Other, net				(0.1)
Change in foreign currency translation, net of tax	(57.2)				(57.2)
Ending Balance at Sep. 30, 2018	1,973	1.2	1,199.3	970.2	(197.7)
Changes in common shareholders' equity
Non-controlling interests	1
Total equity				998.2
Beginning Balance at Jun. 30, 2018		1.2	1,199.3	998.2	(202.4)
Changes in common shareholders' equity
Net (loss) income				(27.7)
Income attributable to non-controlling interests				(0.3)
Accrued dividends on Series A redeemable preference shares	0
Change in foreign currency translation, net of tax	4.7				4.7
Ending Balance at Sep. 30, 2018	1,973	1.2	1,199.3	970.2	(197.7)
Changes in common shareholders' equity
Non-controlling interests	1.1
Total equity	1,974.1
Non-controlling interests	1.7
Total equity				816.6
Beginning Balance at Dec. 31, 2018	1,704.5	1.2	1,089.1	816.6	(202.4)
Changes in common shareholders' equity
Share-based compensation			7.9
Net (loss) income				104.7
Income attributable to non-controlling interests				(1.6)
Change in carrying value of Series B preference shares				(3.9)
Accrued dividends on Series A redeemable preference shares	0
Change in foreign currency translation, net of tax	(69)				(69)
Ending Balance at Sep. 30, 2019	1,742.6	1.2	1,097	915.8	(271.4)
Changes in common shareholders' equity
Non-controlling interests	3
Total equity				918.5
Beginning Balance at Jun. 30, 2019		1.2	1,093.5	918.5	(229.1)
Changes in common shareholders' equity
Share-based compensation			3.4
Other, net			0.1
Net (loss) income				(7.6)
Income attributable to non-controlling interests				(0.4)
Change in carrying value of Series B preference shares				5.3
Accrued dividends on Series A redeemable preference shares	0
Change in foreign currency translation, net of tax	(42.3)				(42.3)
Ending Balance at Sep. 30, 2019	1,742.6	$ 1.2	$ 1,097	$ 915.8	$ (271.4)
Changes in common shareholders' equity
Non-controlling interests	3.4
Total equity	$ 1,746

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operations:
Net income	$ 104.7	$ 113.8
Net income
Net realized and unrealized investment (gains)	(183.3)	(37)
Amortization of premium on fixed maturity investments	(4.7)	5.9
Amortization of intangible assets	11.8	11.8
Depreciation and other amortization	6.3	7.1
Share-based compensation	7.9	0
Other operating items:
Net change in loss and loss adjustment expense reserves	274.1	76.1
Net change in reinsurance recoverable on paid and unpaid losses	(82)	(69.7)
Net change in funds held by ceding companies	(61.5)	(40.9)
Net change in unearned insurance and reinsurance premiums	212.4	311.8
Net change in ceded reinsurance payable	73.3	113
Net change in ceded unearned insurance and reinsurance premiums	(32.4)	(106.3)
Net change in insurance and reinsurance premiums receivable	(269.4)	(271.9)
Net change in deferred acquisition costs	(22.5)	(39.2)
Net change in funds held under reinsurance treaties	33.1	37.1
Net change in current and deferred income taxes, net	(4.8)	38.6
Net change in other assets and liabilities, net	24.9	(42.9)
Net cash provided from operations	87.9	107.3
Cash flows from investing activities:
Net change in short-term investments	(285.8)	(157.6)
Sales of fixed maturities and convertible fixed maturity investments	430.7	1,149.9
Maturities, calls, and paydowns of fixed maturity and convertible fixed maturity investments	239.4	69
Sales of common equity securities	212.6	247.9
Distributions, redemptions, and maturities of other long-term investments	53.6	62.1
Contributions to other long-term investments	(46.5)	(131.3)
Purchases of common equity securities	(174.9)	(392.4)
Purchases of fixed maturities and convertible fixed maturity investments	(504.4)	(1,062.9)
Purchases of consolidated subsidiaries, net of cash acquired	0	(7.9)
Net change in unsettled investment purchases and sales	23.7	18.6
Other, net	0.8	(3.4)
Net cash (used for) investing activities	(50.8)	(208)
Cash flows from financing activities:
Change in collateral held on Interest Rate Cap	(0.1)	0
Capital contribution from former parent	0	1.4
Net cash (used for) provided from financing activities	(0.1)	1.4
Effect of exchange rate changes on cash	(9.4)	(9.8)
Net (decrease) in cash during period	27.6	(109.1)
Cash and restricted cash balance at beginning of period	132.2	230.6
Cash and restricted cash balance at end of period	$ 159.8	$ 121.5

General

General	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General Sirius International Insurance Group, Ltd. (the "Company") is a Bermuda exempted company whose principal businesses are conducted through its wholly and majority owned insurance subsidiaries (collectively with the Company, "Sirius Group"). Sirius Group provides insurance, reinsurance, and insurance services on a worldwide basis.

Summary of significant accounti

Summary of significant accounting policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of significant accounting policies	Summary of significant accounting policies Basis of presentation The accompanying Unaudited Consolidated Financial Statements at September 30, 2019 , have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC") for interim financial information. The accompanying Unaudited Consolidated Financial Statements present the consolidated results of operations, financial condition, and cash flows of the Company and its subsidiaries and those entities in which the Company has control and a majority economic interest as well as those variable interest entities ("VIEs") that meet the requirements for consolidation. All intercompany transactions have been eliminated in consolidation. These Unaudited Consolidated Financial Statements do not include all disclosures normally included in annual financial statements prepared in accordance with GAAP and should be read in conjunction with the Audited Consolidated Financial Statements and the related notes for the year ended December 31, 2018 . The consolidated financial information as of December 31, 2018 included herein has been derived from the Audited Consolidated Financial Statements as of December 31, 2018 . The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the opinion of management, the accompanying Unaudited Consolidated Financial Statements reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of results on an interim basis. Tabular dollar amounts are in millions, with the exception of share and per share amounts. All amounts are reported in U.S. dollars, except where noted otherwise. Recently adopted changes in accounting principles Leases Effective January 1, 2019, Sirius Group adopted Accounting Standards Update ("ASU") 2016-2, Leases (Accounting Standards Codification ("ASC") 842) which requires lessees to recognize lease assets and liabilities on the balance sheet for both operating and financing leases, with the exception of leases with an original term of 12 months or less. Under previous guidance, recognition of lease assets and liabilities was not required for operating leases. The new guidance requires that lease assets and liabilities to be recognized and measured initially based on the present value of the lease payments. Sirius Group adopted the new guidance using the simplified transition option that allows companies to apply the new lease standard at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. Sirius Group also made the following elections: • Sirius Group elected the package of practical expedients to not reassess prior conclusions related to contracts containing leases, lease classification and initial direct costs for all leases upon transition. • Sirius Group did not elect the hindsight practical expedient upon transition, for all leases. • Sirius Group elected the short-term lease measurement and recognition exemption, resulting in lease payments being recorded as an expense on a straight-line basis over the lease term. • Sirius Group elected to include both lease and non-lease components as a single component for all leases. • Sirius Group did not elect the land easement practical expedient as it was not applicable. As a result of the adoption of the new guidance, Sirius Group recognized a lease liability of $36.8 million , which represents the present value of our remaining lease payments and a right-of-use asset of $34.4 million as of January 1, 2019. The adoption of this guidance did not materially impact our results of operations or cash flows. Due to the adoption of the standard using the retrospective cumulative-effect adjustment method, there are no changes to our previously reported results prior to January 1, 2019. Lease expense is not expected to change materially as a result of the adoption of the new guidance. (See Note 18 .) Premium amortization on callable debt securities Effective January 1, 2019, Sirius Group adopted ASU 2017-8, Premium Amortization on Purchased Callable Debt Securities (ASC 310-20), which changes the amortization period for certain purchased callable debt securities. Under the new guidance, for investments in callable debt securities held at a premium, the premium will be amortized over the period to the earliest call date. The new guidance does not change the amortization period for callable debt securities held at a discount. The adoption of this guidance did not have a significant effect on our financial statements. Recent accounting pronouncements Credit losses In June 2016, the Financial Accounting Standards Board issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments (ASC 326), which establishes new guidance for the recognition of credit losses for financial assets measured at amortized cost. The new guidance, which applies to financial assets that have the contractual right to receive cash, including reinsurance receivables and recoverables, requires reporting entities to estimate the credit losses expected over the life of a credit exposure using historical information, current information and reasonable and supportable forecasts that affect the collectability of the financial asset. The new guidance is effective for annual and interim periods beginning after December 15, 2019. Sirius Group is evaluating the expected impact of this new guidance.

Significant transactions

Significant transactions	9 Months Ended
	Sep. 30, 2019
Significant transactions
Significant transactions	Significant transactions Easterly Acquisition Corp. On November 5, 2018, the Company completed the transactions contemplated by the definitive Agreement and Plan of Merger ("Merger Agreement"). Under the terms of the Merger Agreement, Easterly Acquisition Corp. ("Easterly") merged with Sirius Acquisitions Holding Company III and became a wholly-owned subsidiary of the Company (the "Merger"). Upon the closing of the Merger, Easterly's common stock was exchanged for the Company's common shares at an exchange ratio (the "Exchange Ratio") calculated as (i) the amount of cash per public share of Easterly common stock in Easterly's trust account (the "Trust Account") immediately prior to the closing of the Merger divided by (ii) (x) 1.05 multiplied by (y) Sirius Group's adjusted diluted book value per common share as of September 30, 2018 ("Sirius Group September 30 Adjusted DBVPS"). Based on the Sirius Group September 30 Adjusted DBVPS, estimated as of September 30, 2018, and funds in the Trust Account on November 5, 2018, the Exchange Ratio was equal to 0.609 . Following the Merger, the Company's common shares are traded on the Nasdaq Global Select Market under the symbol "SG." Easterly held a special meeting of Easterly stockholders on November 2, 2018 to approve the completion of the transactions contemplated by the Merger Agreement. Easterly Acquisition Sponsor, LLC (the "Sponsor") and Easterly's other stockholders approved each of the proposals presented at the special meeting. After the special meeting, but prior to the consummation of the Merger, certain Easterly public stockholders exercised their redemption rights as provided for by Easterly's charter. In total, out of the Trust Account balance of $149.0 million , there were $109.7 million of redemptions by Easterly public stockholders, which decreased the amount of cash in the Trust Account available for general corporate purposes following the Merger. After the redemption of shares held by Easterly's public stockholders, there was $39.3 million in the Trust Account. This resulted in the issuance of 2,280,241 common shares to Easterly public stockholders. Pursuant to the letter agreement among Easterly, the Sponsor and the Company (the "Sponsor Letter"), the private placement warrants issued to the Sponsor at the closing of the Merger were cancelled. Pursuant to the Merger Agreement, each issued and outstanding public warrant was converted into a warrant exercisable for Company common shares. The number of Company common shares subject to converted warrants was equal to the number of shares of Easterly common stock subject to each Easterly warrant immediately prior to the closing of the Merger multiplied by the Exchange Ratio, and each converted warrant had an exercise price per Company common share equal to the exercise price per share of Easterly common stock subject to such Easterly warrant immediately prior to the closing of the Merger divided by the Exchange Ratio. This resulted in the issuance of 6,088,535 converted warrants. Sirius Group Private Placement In connection with the closing of the Merger, the Company completed a private placement of Series B preference shares, common shares, and warrants (the "Sirius Group Private Placement") at a price per share equal to (i) 1.05 multiplied by (ii) the Sirius Group September 30 Adjusted DBVPS, or $17.22447 . Investors in the Sirius Group Private Placement included affiliated funds of Gallatin Point Capital, The Carlyle Group, Centerbridge Partners, L.P. and Bain Capital Credit (the "Preference Share Investors"), together with certain employees, directors and "friends & family". The Sirius Group Private Placement raised proceeds of $226.1 million , resulting in the purchase of: • 11,901,670 Series B preference shares with a cost basis of $195.8 million , • 1,225,954 of Common shares with a cost basis of $20.8 million , • 5,418,434 warrants that are exercisable for common shares for a period of five years after the Merger at a strike price equal to 125% of the per share purchase price, or $21.53 with a cost basis of $9.6 million . • Issuance costs of $2.0 million . ESPP In connection with the Merger, Sirius Group implemented the Employee Share Purchase Plan ("ESPP"), which provided all employees of Sirius Group with a one-time opportunity to purchase between 100 and 1,000 Company common shares at a price equal to 85% of market value for the first 100 shares and 100% of market value for the next 900 shares. For this purpose, market value of the Company common shares was equal to 1.05 times the Sirius Group September 30 Adjusted DBVPS. Employees had the option of paying for the shares upfront or, in the case of employees who are not executive officers, through a loan that is repaid over a two -year period through payroll deductions. Through the ESPP, 405 employees purchased 149,236 Company common shares prior to the consummation of the Merger, with a cost basis of $2.6 million . Gross proceeds of the cash in the Easterly Trust Account assumed by Sirius Group upon the closing of the Merger, the Sirius Group Private Placement, and the ESPP sum to $268.0 million . Common shares redemption agreement In connection with the Merger, the Company and CM Bermuda Ltd. ("CM Bermuda"), the sole holder of the Company's common shares prior to the Merger, entered into a redemption agreement, dated November 2, 2018 (the "CM Bermuda Redemption Agreement"), pursuant to which, effective as of the closing of the Merger, the Company redeemed 9,519,280 of the Company's common shares at a price per share equal to $17.22447 for $164.0 million , which was paid on November 16, 2018. Also in connection with the Merger, on November 16, 2018 the Company completed a post-closing adjustment of $ 1.6 million that was settled in cash with CM Bermuda based on the reported book value per share of $16.44 as of September 30, 2018, pursuant to the Merger Agreement. Sirius Group incurred certain contractual costs associated with the Merger of $9.0 million and $ 7.1 million of various legal, advisory, and other consulting costs for the Merger and the Sirius Group Private Placement that were charged to Additional paid-in surplus. Series A preference shares redemption agreement In connection with the Merger, the Company, IMG Acquisition Holdings, LLC ("IMGAH") and Sirius Acquisitions Holding Company II completed the transactions contemplated by its previously announced redemption agreement and the Company redeemed all of the outstanding Series A redeemable preference shares, which were held by IMGAH, for $95.0 million in cash. Effective as of the completion of the redemption, the parties terminated the registration rights agreement and the shareholder's agreement between the Company and IMGAH. In addition, the parties agreed that any remaining contingent consideration in respect of the IMG acquisition, will be paid in cash, not in Series A redeemable preference shares as previously contemplated in the agreement in respect of the IMG acquisition. WRM America Indemnity Company, Inc. On August 16, 2018, Sirius Group acquired 100% ownership of WRM America Indemnity Company, Inc. ("WRM America") from WRM America Indemnity Holding Company, LLC for $16.9 million in cash. WRM America is a New York-domiciled insurer with a run-off book of business mainly comprised of general liability, educator's legal liability, automobile liability and physical damage, property and excess catastrophe liability. As part of the purchase of WRM America, Sirius Group acquired $3.1 million of indefinite lived intangible assets related to insurance licenses.

Segment information

Segment information	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Segment information	Segment information Sirius Group classifies its business into four reportable segments – Global Property, Global A&H, Specialty & Casualty, and Runoff & Other. The accounting policies of the reportable segments are the same as those used for the preparation of the Company's consolidated financial statements. The Company's Global Property, Global A&H, Specialty & Casualty, and Runoff & Other reportable segments each have managers who are responsible for the overall profitability of their respective segments and who are directly accountable to the Company's chief operating decision maker, the Chief Executive Officer ("CEO") of the Company. The CEO assesses segment operating performance, allocates capital, and makes resource allocation decisions based on Technical profit (loss), Underwriting profit (loss), and Underwriting profit (loss), including net service fee revenue. Segment results are shown prior to corporate eliminations. Corporate eliminations are shown to reconcile to consolidated Technical profit (loss), consolidated Underwriting profit (loss) and consolidated Underwriting profit (loss), including net service fee revenue. Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets, and, accordingly, investment income is not allocated to each segment. Global Property Global Property consists of Sirius Group's underwriting lines of business that offer other property insurance and reinsurance, property catastrophe excess reinsurance, and agriculture reinsurance on a worldwide basis: Other Property —Sirius Group participates in the broker market for property reinsurance treaties written on a proportional and excess of loss basis. For Sirius Group'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. In the United States, the book predominantly centers on significant participations on proportional and excess of loss treaties mostly in the excess and surplus lines segment of the market. Property Catastrophe Excess —Property catastrophe excess of loss reinsurance treaties cover losses from catastrophic events. Sirius Group writes a worldwide book with the largest concentration of exposure in Europe and the United States. The U.S. book written in Bermuda has a national account focus supporting principally the lower and/or middle layers of large capacity programs. Additionally, Stockholm writes a U.S. book mainly consisting of select small regional and standard lines carriers. The exposures written in the international book are diversified across many countries, regions, perils and layers. Agriculture —Sirius Group provides stop-loss reinsurance coverage to companies writing U.S. government-sponsored multi-peril crop insurance ("MPCI"). Sirius Group's participation is net of the government's stop-loss reinsurance protection. Sirius Group also provides coverage for crop-hail and certain named perils when bundled with MPCI business. Sirius Group also writes agriculture business outside of the United States. Global A&H The Global A&H operating segment consists of Sirius Group's insurance, reinsurance, and managing general underwriting ("MGU") units (which include Armada and IMG) that offer accident and health products on a worldwide basis: Accident and Health insurance and reinsurance —Sirius Group is an insurer of accident and health insurance business in the United States, either on an admitted or surplus lines basis, as well as international business written through wholly-owned IMG. Armada business is written on an admitted basis. Sirius Group also writes proportional and excess reinsurance treaties covering employer medical stop-loss for per person (specific) and per employer (aggregate) exposures. In addition, Sirius Group writes some medical, health, travel and personal accident coverages written on a treaty, facultative and primary basis. Specialty & Casualty Specialty & Casualty consists of Sirius Group's insurance and reinsurance underwriting units which offer specialty & casualty product lines on a worldwide basis. Specialty lines represent unique risks where the more difficult and unusual risks are underwritten. Because specialty lines tend to be the more unusual or higher risks, much of the market is characterized by a high degree of specialization: Aviation & Space provides aviation insurance that covers loss of or damage to an aircraft and the aircraft operations' liability to passengers, cargo and hull as well as to third parties. Additionally, liability arising out of non-aircraft operations such as hangars, airports and aircraft products can be covered. Space insurance primarily covers loss of or damage to a satellite during launch and in orbit. The book consists of treaty, written on both a proportional and excess of loss basis, facultative, and primary business. Marine provides marine reinsurance, primarily written on an excess of loss and proportional basis. Coverage offered includes damage to ships and goods in transit, marine liability lines, and offshore energy industry insurance. Sirius Group also writes yacht business, both on reinsurance and a primary basis. The marine portfolio is diversified across many countries and regions. Trade Credit writes credit and bond reinsurance worldwide. The bulk of the business is traditional short-term commercial credit insurance, covering pre-agreed domestic and export sales of goods and services with typical coverage periods of 60 to 120 days . Losses under these policies are correlated to adverse changes in a respective country's gross national product. Contingency underwrites contingency insurance for event cancellation and non-appearance, primarily on a primary policy and facultative reinsurance basis. Additionally, coverage for liabilities arising from contractual bonus, prize redemption and over-redemption is also offered. The contingency portfolio is diversified across many countries and regions. Casualty underwrites a cross section of all casualty lines, including general liability, umbrella, auto, workers compensation, professional liability, and other specialty classes, written on a proportional, excess of loss, and primary basis. Surety underwrites commercial surety bonds, including non-construction contract bonds, in a broad range of business segments in the United States. Environmental underwrites a pure environmental insurance book in the United States consisting of four core products that revolve around pollution coverage, which are premises pollution liability, contractor's pollution liability, contractor's pollution and professional liability. Runoff & Other Runoff & Other includes the results of Sirius Global Solutions Holding Company ("Sirius Global Solutions"), which specializes in the acquisition and management of runoff liabilities for insurance and reinsurance companies, both in the United States and internationally, as well as asbestos risks, environmental risks and other long-tailed liability exposures. The following tables summarize the segment results for the three months ended September 30, 2019 and 2018 : For the three months ended September 30, 2019 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Corporate Elimination Total Gross written premiums $ 153.6 $ 137.4 $ 120.6 $ 2.1 $ — $ 413.7 Net written premiums $ 103.7 $ 104.6 $ 113.2 $ 0.8 $ — $ 322.3 Net earned insurance and reinsurance premiums $ 159.9 $ 115.1 $ 98.7 $ 0.5 $ — $ 374.2 Loss and allocated LAE (1) (184.4 ) (63.6 ) (85.5 ) (0.9 ) — (334.4 ) Insurance and reinsurance acquisition expenses (29.2 ) (32.5 ) (27.1 ) (0.1 ) 13.8 (75.1 ) Technical profit (53.7 ) 19.0 (13.9 ) (0.5 ) 13.8 (35.3 ) Unallocated LAE (2) (5.5 ) (2.0 ) (3.0 ) (0.2 ) (3.5 ) (14.2 ) Other underwriting expenses (14.7 ) (6.8 ) (8.8 ) (1.4 ) (3.7 ) (35.4 ) Underwriting income (73.9 ) 10.2 (25.7 ) (2.1 ) 6.6 (84.9 ) Service fee revenue (3) — 31.0 — — (14.6 ) 16.4 Managing general underwriter unallocated LAE — (4.3 ) — — 4.3 — Managing general underwriter other underwriting expenses — (3.7 ) — — 3.7 — General and administrative expenses, MGU + Runoff & Other (4) — (15.1 ) — (1.2 ) — (16.3 ) Underwriting income (loss), including net service fee income (73.9 ) 18.1 (25.7 ) (3.3 ) — (84.8 ) Net investment income 22.8 Net realized investment (losses) gains 15.3 Net unrealized investment (losses) gains 53.9 Net foreign exchange gains (losses) 4.9 Other revenue (5) (0.1 ) General and administrative expenses (6) (11.7 ) Intangible asset amortization expenses (3.9 ) Interest expense on debt (7.7 ) Pre-tax income $ (11.3 ) Underwriting Ratios Loss ratio 118.8 % 57.0 % 89.7 % NM NM 93.2 % Acquisition expense ratio 18.3 % 28.2 % 27.5 % NM NM 20.1 % Other underwriting expense ratio 9.2 % 5.9 % 8.9 % NM NM 9.5 % Combined ratio (7) 146.3 % 91.1 % 126.1 % NM NM 122.8 % Goodwill and intangible assets (8) $ — $ 576.1 $ — $ 8.1 $ — $ 584.2 (1) Loss and allocated loss adjustment expenses ("LAE") are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (2) Unallocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (3) Service fee revenue is part of Other revenue on the Consolidated Statements of Income (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (4) General and administrative expenses, MGU + Runoff & Other is part of General and administrative expenses on the Consolidated Statements of Income (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (5) Other revenue is presented net of Service fee revenue and is comprised mainly of a change in contingent consideration (see Note 8 ) and gains from derivatives (see Note 11 ) (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (6) General and administrative expenses are presented net of General and administrative expenses, MGU + Runoff & Other (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (7) Ratios considered not meaningful ("NM") to Runoff & Other and Corporate Elimination. (8) Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets. For the three months ended September 30, 2018 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Corporate Elimination Total Gross written premiums $ 203.7 $ 117.1 $ 76.5 $ 0.7 $ — $ 398.0 Net written premiums $ 144.9 $ 87.9 $ 72.6 $ 0.3 $ — $ 305.7 Net earned insurance and reinsurance premiums $ 172.7 $ 89.6 $ 58.4 $ 0.4 $ — $ 321.1 Loss and allocated LAE (1) (173.2 ) (51.3 ) (34.1 ) 10.2 — (248.4 ) Insurance and reinsurance acquisition expenses (30.1 ) (26.7 ) (16.2 ) (0.1 ) 13.9 (59.2 ) Technical profit (30.6 ) 11.6 8.1 10.5 13.9 13.5 Unallocated LAE (2) (3.3 ) (1.7 ) (1.6 ) (0.7 ) (4.7 ) (12.0 ) Other underwriting expenses (17.5 ) (6.4 ) (8.4 ) (1.4 ) (2.0 ) (35.7 ) Underwriting income (51.4 ) 3.5 (1.9 ) 8.4 7.2 (34.2 ) Service fee revenue (3) — 29.3 — — (13.9 ) 15.4 Managing general underwriter unallocated LAE — (4.7 ) — — 4.7 — Managing general underwriter other underwriting expenses — (2.0 ) — — 2.0 — General and administrative expenses, MGU + Runoff & Other (4) — (13.8 ) — (0.8 ) — (14.6 ) Underwriting income (loss), including net service fee income (51.4 ) 12.3 (1.9 ) 7.6 — (33.4 ) Net investment income 21.8 Net realized investment (losses) gains 3.9 Net unrealized investment (losses) gains (11.7 ) Net foreign exchange gains (losses) (0.4 ) Other revenue (5) 1.6 General and administrative expenses (6) (4.9 ) Intangible asset amortization expenses (3.9 ) Interest expense on debt (7.6 ) Pre-tax income $ (34.6 ) Underwriting Ratios Loss ratio 102.2 % 59.2 % 61.1 % NM NM 81.1 % Acquisition expense ratio 17.4 % 29.8 % 27.7 % NM NM 18.4 % Other underwriting expense ratio 10.1 % 7.1 % 14.4 % NM NM 11.1 % Combined ratio (7) 129.7 % 96.1 % 103.2 % NM NM 110.6 % Goodwill and intangible assets (8) $ — $ 600.1 $ — $ 8.1 $ — $ 608.2 (1) Loss and allocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (2) Unallocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (3) Service fee revenue is part of Other revenue on the Consolidated Statements of Income (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (4) General and administrative expenses, MGU + Runoff & Other is part of General and administrative expenses on the Consolidated Statements of Income (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (5) Other revenue is presented net of Service fee revenue and is comprised mainly of gains from derivatives (see Note 11 ) (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (6) General and administrative expenses are presented net of General and administrative expenses, MGU + Runoff & Other (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (7) Ratios considered not meaningful ("NM") to Runoff & Other and Corporate Elimination. (8) Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets. The following tables summarize the segment results for the nine months ended September 30, 2019 and 2018 : For the nine months ended September 30, 2019 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Corporate Elimination Total Gross written premiums $ 720.5 $ 459.5 $ 338.4 $ 4.7 $ — $ 1,523.1 Net written premiums $ 536.6 $ 360.1 $ 310.6 $ 1.5 $ — $ 1,208.8 Net earned insurance and reinsurance premiums $ 463.9 $ 330.0 $ 261.7 $ 1.2 $ — $ 1,056.8 Loss and allocated LAE (1) (378.3 ) (198.6 ) (194.4 ) (4.4 ) — (775.7 ) Insurance and reinsurance acquisition expenses (82.2 ) (95.1 ) (72.2 ) (2.6 ) 36.7 (215.4 ) Technical profit 3.4 36.3 (4.9 ) (5.8 ) 36.7 65.7 Unallocated LAE (2) (10.2 ) (5.5 ) (7.1 ) (0.9 ) (11.1 ) (34.8 ) Other underwriting expenses (47.9 ) (18.8 ) (23.7 ) (4.6 ) (11.2 ) (106.2 ) Underwriting income (loss) (54.7 ) 12.0 (35.7 ) (11.3 ) 14.4 (75.3 ) Service fee revenue (3) — 97.6 — — (39.3 ) 58.3 Managing general underwriter unallocated LAE — (13.7 ) — — 13.7 — Managing general underwriter other underwriting expenses — (11.2 ) — — 11.2 — General and administrative expenses, MGU + Runoff & Other (4) — (46.3 ) — (3.0 ) — (49.3 ) Underwriting income (loss), including net service fee income (54.7 ) 38.4 (35.7 ) (14.3 ) — (66.3 ) Net investment income 67.3 Net realized investment (losses) gains 39.9 Net unrealized investment (losses) gains 143.4 Net foreign exchange gains (losses) 9.4 Other revenue (5) (7.0 ) General and administrative expenses (6) (31.3 ) Intangible asset amortization expenses (11.8 ) Interest expense on debt (23.3 ) Pre-tax income $ 120.3 Underwriting Ratios Loss ratio 83.7 % 61.8 % 77.0 % NM NM 76.7 % Acquisition expense ratio 17.7 % 28.8 % 27.6 % NM NM 20.4 % Other underwriting expense ratio 10.3 % 5.7 % 9.1 % NM NM 10.0 % Combined ratio (7) 111.7 % 96.3 % 113.7 % NM NM 107.1 % Goodwill and intangible assets (8) $ — $ 576.1 $ — $ 8.1 $ — $ 584.2 (1) Loss and allocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (2) Unallocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (3) Service fee revenue is part of Other revenue on the Consolidated Statements of Income (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (4) General and administrative expenses, MGU + Runoff & Other is part of General and administrative expenses on the Consolidated Statements of Income (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (5) Other revenue is presented net of Service fee revenue and is comprised mainly of a change in contingent consideration (see Note 8 ) and (losses) from derivatives (see Note 11 ) (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (6) General and administrative expenses are presented net of General and administrative expenses, MGU + Runoff & Other (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (7) Ratios considered not meaningful ("NM") to Runoff & Other and Corporate Elimination. (8) Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets. For the nine months ended September 30, 2018 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Corporate Elimination Total Gross written premiums $ 875.7 $ 375.0 $ 252.9 $ 14.6 $ — $ 1,518.2 Net written premiums $ 569.1 $ 286.2 $ 228.3 $ 11.8 $ — $ 1,095.4 Net earned insurance and reinsurance premiums $ 476.3 $ 258.4 $ 168.3 $ 11.5 $ — $ 914.5 Loss and allocated LAE (1) (311.8 ) (138.0 ) (87.4 ) 12.3 — (524.9 ) Insurance and reinsurance acquisition expenses (93.5 ) (82.3 ) (44.9 ) (2.3 ) 34.0 (189.0 ) Technical profit 71.0 38.1 36.0 21.5 34.0 200.6 Unallocated LAE (2) (7.7 ) (4.3 ) (4.5 ) (1.6 ) (9.8 ) (27.9 ) Other underwriting expenses (53.0 ) (20.7 ) (24.3 ) (5.2 ) (13.9 ) (117.1 ) Underwriting income 10.3 13.1 7.2 14.7 10.3 55.6 Service fee revenue (3) — 89.5 — — (34.0 ) 55.5 Managing general underwriter unallocated LAE — (9.8 ) — — 9.8 — Managing general underwriter other underwriting expenses — (13.9 ) — — 13.9 — General and administrative expenses, MGU + Runoff & Other (4) — (37.5 ) — (2.9 ) — (40.4 ) Underwriting income (loss), including net service fee income 10.3 41.4 7.2 11.8 — 70.7 Net investment income 51.8 Net realized investment (losses) gains 8.0 Net unrealized investment (losses) gains 29.0 Net foreign exchange gains (losses) 21.7 Other revenue (5) 40.5 General and administrative expenses (6) (17.6 ) Intangible asset amortization expenses (11.8 ) Interest expense on debt (23.1 ) Pre-tax income $ 169.2 Underwriting Ratios Loss ratio 67.1 % 55.1 % 54.6 % NM NM 60.4 % Acquisition expense ratio 19.6 % 31.8 % 26.7 % NM NM 20.7 % Other underwriting expense ratio 11.1 % 8.0 % 14.4 % NM NM 12.8 % Combined ratio (7) 97.8 % 94.9 % 95.7 % NM NM 93.9 % Goodwill and intangible assets (8) $ — $ 600.1 $ — $ 8.1 $ — $ 608.2 (1) Loss and allocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (2) Unallocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (3) Service fee revenue is part of Other revenue on the Consolidated Statements of Income (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (4) General and administrative expenses, MGU + Runoff & Other is part of General and administrative expenses on the Consolidated Statements of Income (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (5) Other revenue is presented net of Service fee revenue and is comprised mainly of the right of indemnification (see Note 10 ), (losses) from derivatives (see Note 11 ), and the termination of the call option to purchase The Phoenix Holdings, Ltd. (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (6) General and administrative expenses are presented net of General and administrative expenses, MGU + Runoff & Other (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (7) Ratios considered not meaningful ("NM") to Runoff & Other and Corporate Elimination. (8) Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets. The following tables provide summary information regarding net premiums written by client location and underwriting location by reportable segment for the three months ended September 30, 2019 and 2018 : For the three months ended September 30, 2019 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Total Net written premiums by client location: United States $ 44.0 $ 87.6 $ 83.1 $ 0.7 $ 215.4 Europe 14.6 5.8 15.1 (0.1 ) 35.4 Canada, the Caribbean, Bermuda and Latin America 19.7 3.7 4.8 0.1 28.3 Asia and Other 25.4 7.5 10.2 0.1 43.2 Total net written premium by client location for the three months ended September 30, 2019 $ 103.7 $ 104.6 $ 113.2 $ 0.8 $ 322.3 Net written premiums by underwriting location: United States $ 7.5 $ 36.9 $ 12.7 $ 0.7 $ 57.8 Europe 45.0 68.1 51.2 — 164.3 Canada, the Caribbean, Bermuda and Latin America 42.3 (0.6 ) 49.0 — 90.7 Asia and Other 8.9 0.2 0.3 0.1 9.5 Total written premiums by underwriting location for the three months ended September 30, 2019 $ 103.7 $ 104.6 $ 113.2 $ 0.8 $ 322.3 For the three months ended September 30, 2018 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Total Net written premiums by client location: United States $ 62.4 $ 71.4 $ 45.3 $ (0.1 ) $ 179.0 Europe 22.8 7.4 15.8 0.1 46.1 Canada, the Caribbean, Bermuda and Latin America 24.7 2.6 2.8 — 30.1 Asia and Other 35.0 6.5 8.7 0.3 50.5 Total net written premium by client location for the three months ended September 30, 2018 $ 144.9 $ 87.9 $ 72.6 $ 0.3 $ 305.7 Net written premiums by underwriting location: United States $ 12.6 $ 27.7 $ 5.8 $ — $ 46.1 Europe 61.3 52.7 36.1 — 150.1 Canada, the Caribbean, Bermuda and Latin America 53.8 7.3 30.5 — 91.6 Asia and Other 17.2 0.2 0.2 0.3 17.9 Total written premiums by underwriting location for the three months ended September 30, 2018 $ 144.9 $ 87.9 $ 72.6 $ 0.3 $ 305.7 The following tables provide summary information regarding net premiums written by client location and underwriting location by reportable segment for the nine months ended September 30, 2019 and 2018 : For the nine months ended September 30, 2019 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Total Net written premiums by client location: United States $ 209.2 $ 301.2 $ 214.9 $ 1.0 $ 726.3 Europe 154.3 18.9 53.4 0.1 226.7 Canada, the Caribbean, Bermuda and Latin America 58.8 10.7 11.4 0.1 81.0 Asia and Other 114.3 29.3 30.9 0.3 174.8 Total net written premium by client location for the nine months ended September 30, 2019 $ 536.6 $ 360.1 $ 310.6 $ 1.5 $ 1,208.8 Net written premiums by underwriting location: United States $ 20.0 $ 136.0 $ 37.8 $ 1.0 $ 194.8 Europe 269.7 190.1 140.3 0.2 600.3 Canada, the Caribbean, Bermuda and Latin America 203.6 33.4 130.8 — 367.8 Asia and Other 43.3 0.6 1.7 0.3 45.9 Total written premiums by underwriting location for the nine months ended September 30, 2019 $ 536.6 $ 360.1 $ 310.6 $ 1.5 $ 1,208.8 For the nine months ended September 30, 2018 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Total Net written premiums by client location: United States $ 241.0 $ 229.5 $ 119.6 $ 11.4 $ 601.5 Europe 148.4 25.1 76.0 0.1 249.6 Canada, the Caribbean, Bermuda and Latin America 69.7 8.6 7.4 — 85.7 Asia and Other 110.0 23.0 25.3 0.3 158.6 Total net written premium by client location for the nine months ended September 30, 2018 $ 569.1 $ 286.2 $ 228.3 $ 11.8 $ 1,095.4 Net written premiums by underwriting location: United States $ 28.8 $ 81.0 $ 9.3 $ 11.5 $ 130.6 Europe 271.5 164.5 132.8 — 568.8 Canada, the Caribbean, Bermuda and Latin America 224.0 40.1 84.3 — 348.4 Asia and Other 44.8 0.6 1.9 0.3 47.6 Total written premiums by underwriting location for the nine months ended September 30, 2018 $ 569.1 $ 286.2 $ 228.3 $ 11.8 $ 1,095.4

Reserves for unpaid losses and

Reserves for unpaid losses and loss adjustment expenses	9 Months Ended
	Sep. 30, 2019
Insurance [Abstract]
Reserves for unpaid losses and loss adjustment expenses	Reserves for unpaid losses and loss adjustment expenses The following table summarizes the loss and LAE reserve activities of Sirius Group for the three months and nine months ended September 30, 2019 and 2018 : Three months ended September 30, Nine months ended September 30, (Millions) 2019 2018 2019 2018 Gross beginning balance $ 2,023.3 $ 1,827.1 $ 2,016.7 $ 1,898.5 Less beginning reinsurance recoverable on unpaid losses (357.4 ) (358.3 ) (350.2 ) (319.7 ) Net loss and LAE reserve balance 1,665.9 1,468.8 1,666.5 1,578.8 Losses and LAE incurred relating to: Current year losses 342.2 270.5 723.6 575.8 Prior years losses 6.4 (10.1 ) 86.9 (23.0 ) Total net incurred losses and LAE 348.6 260.4 810.5 552.8 Foreign currency translation adjustment to net loss and LAE reserves (15.3 ) (5.4 ) (15.3 ) (20.9 ) Acquisitions (See Note 3) — 0.2 — 0.2 Accretion of fair value adjustment to net loss and LAE reserves — 0.1 0.1 0.1 Loss and LAE paid relating to: Current year losses 97.7 80.5 254.8 152.5 Prior years losses 108.0 101.6 413.5 416.5 Total loss and LAE payments 205.7 182.1 668.3 569.0 Net ending balance 1,793.5 1,542.0 1,793.5 1,542.0 Plus ending reinsurance recoverable on unpaid losses 392.9 349.0 392.9 349.0 Gross ending balance $ 2,186.4 $ 1,891.0 $ 2,186.4 $ 1,891.0 Loss and LAE development - Three Months Ended September 30, 2019 For the three months ended September 30, 2019 , Sirius Group had net unfavorable loss reserve development of $6.4 million . Increases in loss reserve estimates were primarily recorded in Specialty & Casualty ( $10.2 million ) due to higher than expected claims activity in the Casualty Reinsurance book. These increases were partially offset by favorable loss reserve development in Global A&H ($ 5.8 million). Loss and LAE development - Three Months Ended September 30, 2018 For the three months ended September 30, 2018 , Sirius Group had net favorable loss reserve development of $10.1 million . The major reductions in loss reserve estimates were recorded in Runoff & Other ( $10.6 million ), Specialty & Casualty ( $7.3 million ), and Global A&H ($ 3 .0 million). The reduction in Runoff & Other was primarily due to decrease in runoff casualty reserves from older accident years, whereas Specialty & Casualty was due to favorable loss reserve development across all business lines in more recent accident years. These reductions were partially offset by increases in Global Property loss reserve development of $10.8 million resulting from higher than expected reporting from recent accident years. Loss and LAE development - Nine Months Ended September 30, 2019 For the nine months ended September 30, 2019 , Sirius Group had net unfavorable loss reserve development of $86.9 million . Increases in loss reserve estimates were recorded in Global Property ( $67.9 million ), Specialty & Casualty ( $14.8 million ), and Runoff & Other ( $5.4 million ). The unfavorable loss reserve development in Global Property was primarily attributable to prior year catastrophe events, including Typhoon Jebi and Hurricanes Michael, Florence, and Irma. These reductions were partially offset by a decrease in Global A&H ($ 1.3 million). Loss and LAE development - Nine Months Ended September 30, 2018 For the nine months ended September 30, 2018 , Sirius Group had net favorable loss reserve development of $23.0 million . The major reductions in loss reserve estimates were recorded in Runoff & Other ( $22.6 million ), Specialty & Casualty ( $17.7 million ), and Global A&H ( $11.4 million ). Favorable loss reserve development for Runoff & Other included reduction in World Trade Center claims in response to revised information received by the Company in addition to favorable loss reserve development in runoff casualty reserves. In addition, Specialty & Casualty had favorable loss reserve development across all business lines, in particular Aviation & Space with $12.0 million . These reductions were partially offset by increases in Global Property loss reserve development of $28.7 million resulting from higher than expected reporting from recent accident years, including $7.4 million of increases from natural catastrophes, including the 2017 North American natural catastrophes. Also, in Other Property, there was loss deterioration from recent accident years reported in client account statements received, which accounted for the remainder of Global Property unfavorable loss development in the nine months ended September 30, 2018 .

Third party reinsurance

Third party reinsurance	9 Months Ended
	Sep. 30, 2019
Insurance [Abstract]
Third party reinsurance	Third party reinsurance In the normal course of business, Sirius Group seeks to protect its businesses from losses due to concentration of risk and losses arising from catastrophic events by reinsuring with third-party reinsurers. Sirius Group remains liable for risks reinsured in the event that the reinsurer does not honor its obligations under reinsurance contracts. At September 30, 2019 , Sirius Group had reinsurance recoverables on paid losses of $55.2 million and reinsurance recoverables of $392.9 million on unpaid losses. At December 31, 2018 , Sirius Group had reinsurance recoverables on paid losses of $55.0 million and reinsurance recoverables of $350.2 million on unpaid losses. Because retrocessional reinsurance contracts do not relieve Sirius Group of its obligation to its insureds, the collectability of balances due from Sirius Group's reinsurers is important to its financial strength. Sirius Group monitors the financial strength and ratings of retrocessionaires on an ongoing basis. Uncollectible amounts historically have not been significant.

Investment securities

Investment securities	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Investment securities	Investment securities Sirius Group's invested assets consist of investment securities and other long-term investments held for general investment purposes. The portfolio of investment securities includes fixed maturity investments, short-term investments, equity securities, and other-long term investments which are all classified as trading securities. Realized and unrealized investment gains and losses on trading securities are reported in pre-tax revenues. Net investment income Sirius Group's net investment income is comprised primarily of interest income along with associated amortization of premium and accretion of discount on Sirius Group's fixed maturity investments, dividend income from its equity investments, and interest income from its short-term investments. Net investment income for the three months and nine months ended September 30, 2019 and 2018 consisted of the following: For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Fixed maturity investments $ 12.8 $ 14.2 $ 40.0 $ 37.8 Short-term investments 4.1 2.4 12.0 3.7 Equity securities 2.7 5.9 12.5 14.2 Other long-term investments 5.2 2.7 12.3 5.2 Total investment income 24.8 25.2 76.8 60.9 Investment expenses (2.0 ) (3.4 ) (9.5 ) (9.1 ) Net investment income $ 22.8 $ 21.8 $ 67.3 $ 51.8 Net realized and unrealized investment gains (losses) Net realized and unrealized investment gains (losses) for the three months and nine months ended September 30, 2019 and 2018 consisted of the following: For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Gross realized gains $ 22.1 $ 11.3 $ 63.1 $ 31.7 Gross realized (losses) (6.8 ) (7.4 ) (23.2 ) (23.7 ) Net realized gains on investments (1)(2) 15.3 3.9 39.9 8.0 Net unrealized gains (losses) on investments (3)(4) 53.9 (11.7 ) 143.4 29.0 Net realized and unrealized gains (losses) on investments $ 69.2 $ (7.8 ) $ 183.3 $ 37.0 (1) Includes $14.0 and $4.7 of realized gains due to foreign currency for the three months ended September 30, 2019 and 2018 , respectively. (2) Includes $34.5 and $10.7 of realized gains due to foreign currency for the nine months ended September 30, 2019 and 2018 , respectively. (3) Includes $33.9 and $(5.5) of unrealized (losses) gains due to foreign currency for the three months ended September 30, 2019 and 2018 , respectively. (4) Includes $ 51.7 and $ 43.1 of unrealized gains due to foreign currency for the nine months ended September 30, 2019 and 2018 , respectively. Net realized investment gains Net realized investment gains for the three months and nine months ended September 30, 2019 and 2018 consisted of the following: For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Fixed maturity investments $ 7.5 $ 4.2 $ 22.4 $ 5.0 Equity securities 1.7 (0.6 ) (0.1 ) (0.4 ) Short-term investments 6.5 — 9.7 — Derivative instruments (0.7 ) — (1.5 ) — Other long-term investments 0.3 0.3 9.4 3.4 Net realized investment gains $ 15.3 $ 3.9 $ 39.9 $ 8.0 Net unrealized investment gains (losses) Net unrealized investment gains (losses) for the three months and nine months ended September 30, 2019 and 2018 consisted of the following: For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Fixed maturity investments $ 31.4 $ (8.6 ) $ 72.1 $ 12.2 Equity securities 12.0 0.9 50.4 2.1 Short-term investments 4.6 — 6.4 — Derivative instruments 0.9 — 0.2 — Other long-term investments 5.0 (4.0 ) 14.3 14.7 Net unrealized investment gains (losses) $ 53.9 $ (11.7 ) $ 143.4 $ 29.0 The following table summarizes the amount of total gains (losses) included in earnings attributable to unrealized investment gains (losses) for Level 3 investments for the three months and nine months ended September 30, 2019 and 2018 : For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Fixed maturity investments $ — $ 0.1 $ — $ (2.0 ) Other long-term investments (0.3 ) (1.6 ) 10.1 6.1 Total unrealized investment (losses) gains – Level 3 investments $ (0.3 ) $ (1.5 ) $ 10.1 $ 4.1 Investment holdings Fixed maturity investments The cost or amortized cost, gross unrealized investment gains (losses), net foreign currency gains (losses), and fair value of Sirius Group's fixed maturity investments as of September 30, 2019 and December 31, 2018 , were as follows: September 30, 2019 (Millions) Cost or amortized cost Gross unrealized gains Gross unrealized (losses) Net foreign currency gains (losses) Fair value Corporate debt securities $ 517.7 $ 6.3 $ (0.3 ) $ 24.0 $ 547.7 Asset-backed securities 501.4 1.1 (1.9 ) 6.6 507.2 Residential mortgage-backed securities 365.9 11.9 (0.8 ) 14.5 391.5 U.S. government and government agency 157.6 1.7 — 3.0 162.3 Commercial mortgage-backed securities 102.0 1.2 (0.4 ) 1.8 104.6 Non-U.S. government and government agency 37.8 0.3 (0.1 ) 0.4 38.4 Preferred stocks 18.0 0.1 (0.1 ) (0.1 ) 17.9 U.S. States, municipalities and political subdivision 1.7 — — 0.1 1.8 Total fixed maturity investments $ 1,702.1 $ 22.6 $ (3.6 ) $ 50.3 $ 1,771.4 December 31, 2018 (Millions) Cost or amortized cost Gross unrealized gains Gross unrealized (losses) Net foreign currency gains (losses) Fair value Corporate debt securities $ 694.1 $ 1.4 $ (7.3 ) $ 7.6 $ 695.8 Asset-backed securities 496.3 0.1 (3.8 ) 1.9 494.5 Residential mortgage-backed securities 413.0 1.7 (7.1 ) 5.9 413.5 U.S. government and government agency 163.9 0.3 (0.5 ) 4.2 167.9 Commercial mortgage-backed securities 117.7 0.2 (2.7 ) 0.7 115.9 Non-U.S. government and government agency 50.6 — (0.2 ) (0.1 ) 50.3 Preferred stocks 14.5 0.6 (6.8 ) 0.2 8.5 U.S. States, municipalities and political subdivision 2.8 — — — 2.8 Total fixed maturity investments $ 1,952.9 $ 4.3 $ (28.4 ) $ 20.4 $ 1,949.2 The weighted average duration of Sirius Group's fixed income portfolio as of September 30, 2019 was approximately 1.6 years , including short-term investments, and approximately 2.5 years excluding short-term investments. The cost or amortized cost and fair value of Sirius Group's fixed maturity investments as of September 30, 2019 and December 31, 2018 are presented below 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. September 30, 2019 December 31, 2018 (Millions) Cost or amortized cost Fair value Cost or amortized cost Fair value Due in one year or less $ 155.5 $ 162.6 $ 249.6 $ 254.6 Due after one year through five years 487.3 513.6 635.6 636.4 Due after five years through ten years 40.8 41.7 26.2 25.7 Due after ten years 31.2 32.3 0.1 0.1 Mortgage-backed and asset-backed securities 969.3 1,003.3 1,026.9 1,023.9 Preferred stocks 18.0 17.9 14.5 8.5 Total $ 1,702.1 $ 1,771.4 $ 1,952.9 $ 1,949.2 The following table summarizes the ratings and fair value of fixed maturity investments held in Sirius Group's investment portfolio as of September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 AAA $ 573.5 $ 602.0 AA 740.8 818.0 A 257.9 290.5 BBB 120.4 167.4 Other 78.8 71.3 Total fixed maturity investments (1) $ 1,771.4 $ 1,949.2 (1)Credit ratings are assigned based on the following hierarchy: 1) Standard & Poor's ("S&P") and 2) Moody's Investors Service ("Moody's"). At September 30, 2019 , the above totals included $50.0 million of sub-prime securities. Of this total, $ 26.1 million was rated AAA, $ 19.8 million rated AA, $ 3.9 million rated A and $ 0.2 million classified as Other. At December 31, 2018 , the above totals included $42.6 million of sub-prime securities. Of this total, $17.1 million was rated AAA, $9.8 million rated AA, $6.0 million rated A, $4.7 million rated BBB and $5.0 million classified as Other. 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 Sirius Group's equity securities and other long-term investments as of September 30, 2019 and December 31, 2018 , were as follows: September 30, 2019 (Millions) Cost or amortized cost Gross unrealized gains Gross unrealized losses Net foreign currency gains Fair value Equity securities $ 359.4 $ 46.8 $ (35.2 ) $ 13.3 $ 384.3 Other long-term investments $ 332.6 $ 52.7 $ (29.7 ) $ 12.8 $ 368.4 December 31, 2018 (Millions) Cost or amortized cost Gross unrealized gains Gross unrealized losses Net foreign currency gains Fair value Equity securities $ 409.4 $ 17.8 $ (50.8 ) $ 3.6 $ 380.0 Other long-term investments $ 337.6 $ 32.6 $ (13.5 ) $ 8.3 $ 365.0 Equity securities at fair value consisted of the following as of September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Investment grade fixed income mutual funds $ 150.9 $ 157.7 Common stocks 231.8 222.3 Other 1.6 — Total Equity securities $ 384.3 $ 380.0 Other long-term investments at fair value consisted of the following as of September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Hedge funds and private equity funds $ 287.7 $ 301.4 Limited liability companies and private equity securities 80.7 63.6 Total other long-term investments $ 368.4 $ 365.0 Hedge Funds and Private Equity Funds Sirius Group holds investments in hedge funds and private equity funds, which are included in other long-term investments. The fair value of these investments has been estimated using the net asset value of the funds. As of September 30, 2019 , Sirius Group held investments in 9 hedge funds and 29 private equity funds. The largest investment in a single fund was $52.3 million as of September 30, 2019 and $54.8 million as of December 31, 2018 . The following table summarizes investments in hedge funds and private equity interests by investment objective and sector as of September 30, 2019 and December 31, 2018 : September 30, 2019 December 31, 2018 (Millions) Fair Value Unfunded Commitments Fair Value Unfunded Commitments Hedge funds: Long/short multi-sector $ 50.6 $ — $ 41.0 $ — Distressed mortgage credit 52.3 — 54.8 — Private Credit 21.2 — 20.0 — Other 1.5 — 2.5 — Total hedge funds 125.6 — 118.3 — Private equity funds: Energy infrastructure & services 64.2 41.4 93.7 54.2 Multi-sector 10.4 7.9 9.0 0.7 Healthcare 31.9 10.8 31.7 15.6 Life settlement 25.7 — 23.7 — Manufacturing/Industrial 27.8 3.8 23.6 10.4 Private equity secondaries 0.6 0.8 1.1 1.1 Real estate 0.3 — 0.3 — Other 1.2 2.5 — — Total private equity funds 162.1 67.2 183.1 82.0 Total hedge and private equity funds included in other long-term investments $ 287.7 $ 67.2 $ 301.4 $ 82.0 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 September 30, 2019 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 30-59 days notice 60-89 days notice 90-119 days notice 120+ days notice Total Monthly $ — $ 35.7 $ — $ — $ 35.7 Quarterly 0.8 — — — 0.8 Semi-annual — 0.3 — — 0.3 Annual — 14.9 52.7 21.2 88.8 Total $ 0.8 $ 50.9 $ 52.7 $ 21.2 $ 125.6 Certain of the hedge fund and private equity fund investments in which Sirius Group 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 September 30, 2019 , no distributions were outstanding from these investments. Investments in private equity funds are generally subject to a "lock-up" period during which investors may not request a redemption. 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 period at either the sole discretion of the fund manager or upon agreement between the fund and the investors. As of September 30, 2019 , investments in private equity funds were subject to lock-up periods as follows: (Millions) 1 - 3 years 3 – 5 years 5 – 10 years Total Private Equity Funds – expected lock up period remaining $ 10.3 $ 3.3 $ 148.5 $ 162.1 Investments held on deposit or as collateral As of September 30, 2019 and December 31, 2018 investments of $797.8 million and $792.4 million , respectively, were held in trusts required to be maintained in relation to various reinsurance agreements. Sirius Group's reinsurance operations are required to maintain deposits with certain insurance regulatory agencies in order to maintain their insurance licenses. The fair value of such deposits that are included within total investments totaled $817.5 million and $801.2 million as of September 30, 2019 and December 31, 2018 , respectively. As of September 30, 2019 , Sirius Group held $0.2 million of collateral in the form of short-term investments associated with Interest Rate Cap agreements. (See Note 11 .) Unsettled investment purchases and sales As of September 30, 2019 and December 31, 2018 Sirius Group reported $34.7 million and $3.2 million , respectively, in Accounts payable on unsettled investment purchases. As of September 30, 2019 and December 31, 2018 , Sirius Group reported $12.9 million and $5.0 million , respectively, in Accounts receivable on unsettled investment sales.

Fair value measurements

Fair value measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair value measurements	Fair value measurements Fair value measurements are categorized into a hierarchy that distinguishes between inputs based on market data from independent sources ("observable inputs") and a reporting entity's internal assumptions based upon the best information available when external market data is limited or unavailable ("unobservable inputs"). Quoted prices in active markets for identical assets or liabilities have the highest priority ("Level 1"), followed by observable inputs other than quoted prices, including prices for similar but not identical assets or liabilities ("Level 2"), and unobservable inputs, including the reporting entity's estimates of the assumptions that market participants would use, having the lowest priority ("Level 3"). The availability of observable inputs can vary from financial instrument to financial instrument and is affected by a wide variety factors including, for example, the type of financial instrument, whether the financial instrument is new and not yet established in the marketplace, and other characteristics particular to the instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires significantly more judgment. Accordingly, the degree of judgment exercised by management in determining fair value is greatest for instruments categorized in Level 3. In periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This may lead the Company to change the selection of the valuation technique (for example, from market to cash flow approach) or to use multiple valuation techniques to estimate the fair value of a financial instrument. These circumstances could cause an instrument to be reclassified between levels within the fair value hierarchy. Investments valued using Level 1 inputs include fixed maturity investments, primarily investments in U.S. Treasuries Bills and Notes, equity securities, and short-term investments. Investments valued using Level 2 inputs are primarily comprised of fixed maturity investments, which have been disaggregated into classes, including U.S. government and government agency, corporate debt securities, mortgage-backed and asset-backed securities, non-U.S. government and government agency, U.S. state and municipalities and political subdivision and preferred stocks. Investments valued using Level 2 inputs also include certain exchange-traded funds that track U.S. stock indices such as the S&P 500 but are traded on foreign exchanges. Fair value estimates for investments that trade infrequently and have few or no observable market prices are classified as Level 3 measurements. Sirius Group determines when transfers between levels have occurred as of the beginning of the period. Valuation techniques Sirius Group uses outside pricing services to assist in determining fair values for its investments. For investments in active markets, Sirius Group uses the quoted market prices provided by outside pricing services to determine fair value. The outside pricing services Sirius Group uses have indicated that they will only provide prices where observable inputs are available. In circumstances where quoted market prices are unavailable or are not considered reasonable, Sirius Group 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 fixed maturity investments 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 fixed maturity investments vary by asset type and take into account market convention. The valuation process above is generally applicable to all of Sirius Group's fixed maturity investments. The techniques and inputs specific to asset classes within Sirius Group's fixed maturity investments for Level 2 securities that use observable inputs are as follows: 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 that 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 that 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. 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 that may influence risk. Mortgage-backed and asset-backed securities The fair value of mortgage and asset-backed securities is primarily priced by pricing services using a pricing model that utilizes information from market sources and leveraging similar securities. Key inputs include benchmark yields, reported trades, underlying tranche cash flow data and 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. 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 described for U.S. government and government agency securities described above. 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 the 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. Level 3 investments Level 3 valuations are generated from techniques that use assumptions not observable in the market. These unobservable assumptions reflect Sirius Group's assumptions about what 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. Sirius Group 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 Sirius Group's investments in private equity securities and private debt instruments have been classified as Level 3 measurements. They are carried at fair value and are initially valued based on transaction price. Their valuation is subsequently estimated based on available evidence such as a market transaction in similar instruments and other financial information for the issuer. Investments measured using net asset value The fair value of Sirius Group's investments in hedge funds and private equity funds has been determined using net asset value ("NAV"). The hedge fund's administrator provides quarterly updates of fair value in the form of Sirius Group'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 fair value of investment in hedge funds is measured using the NAV practical expedient and therefore has been not categorized within the fair value hierarchy. The private equity funds provide quarterly or semi-annual partnership capital statements with a three or six 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. In these circumstances, Sirius Group estimates the return of the current period and uses all credible information available. This includes utilizing preliminary estimates reported by its fund managers and using other information that is available to Sirius Group with respect to the underlying investments, as necessary. Fair value measurements by level The following tables summarize Sirius Group's financial assets and liabilities measured at fair value as of September 30, 2019 and December 31, 2018 by level: September 30, 2019 (Millions) Fair Value Level 1 Inputs Level 2 Inputs Level 3 Inputs Assets measured at fair value Fixed maturity investments: U.S. Government and government agency $ 162.3 $ 160.9 $ 1.4 $ — Corporate debt securities 547.7 — 547.7 — Residential mortgage-backed securities 391.5 — 391.5 — Asset-backed securities 507.2 — 507.2 — Commercial mortgage-backed securities 104.6 — 104.6 — Non-U.S. government and government agency 38.4 21.3 17.1 — Preferred stocks 17.9 — 0.9 17.0 U.S. States, municipalities, and political subdivision 1.8 — 1.8 — Total fixed maturity investments 1,771.4 182.2 1,572.2 17.0 Equity securities: Investment grade fixed income mutual funds 150.9 150.9 — — Common stocks 231.8 231.8 — — Other 1.6 — 1.6 — Total equity securities 384.3 382.7 1.6 — Short-term investments 989.3 978.8 10.5 — Other long-term investments (1) 80.7 — — 80.7 Total investments $ 3,225.7 $ 1,543.7 $ 1,584.3 $ 97.7 Derivative instruments 6.3 1.6 — 4.7 Total assets measured at fair value $ 3,232.0 $ 1,545.3 $ 1,584.3 $ 102.4 Liabilities measured at fair value Contingent consideration liabilities $ 26.0 $ — $ — $ 26.0 Derivative instruments 6.9 — — 6.9 Total liabilities measured at fair value $ 32.9 $ — $ — $ 32.9 (1) Excludes fair value of $287.7 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. December 31, 2018 (Millions) Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets measured at fair value Fixed maturity investments: U.S. Government and government agency $ 167.9 $ 164.7 $ 3.2 $ — Corporate debt securities 695.8 — 695.8 — Asset-backed securities 494.5 — 494.5 — Residential mortgage-backed securities 413.5 — 413.5 — Commercial mortgage-backed securities 115.9 — 115.9 — Non-U.S. government and government agency 50.3 42.9 7.4 — Preferred stocks 8.5 — 3.1 5.4 U.S. States, municipalities, and political subdivision 2.8 — 2.8 — Total fixed maturity investments 1,949.2 207.6 1,736.2 5.4 Short-term investments 715.5 679.3 36.2 — Equity securities: Investment grade fixed income mutual funds 157.7 157.7 — — Common stocks 222.3 222.3 — — Total equity securities 380.0 380.0 — — Other long-term investments (1) 63.6 — — 63.6 Total investments $ 3,108.3 $ 1,266.9 $ 1,772.4 $ 69.0 Derivative instruments 4.1 — — 4.1 Total assets measured at fair value $ 3,112.4 $ 1,266.9 $ 1,772.4 $ 73.1 Liabilities measured at fair value Contingent consideration liabilities $ 28.8 $ — $ — $ 28.8 Derivative instruments 5.1 0.5 — 4.6 Total liabilities measured at fair value $ 33.9 $ 0.5 $ — $ 33.4 (1) Excludes fair value of $301.4 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. Rollforward of Level 3 fair value measurements The following tables present changes in Level 3 for financial instruments measured at fair value for the three months ended September 30, 2019 and September 30, 2018 : For the three months ended September 30, 2019 (Millions) Fixed Maturities Other long-term investments (1) Derivative instruments assets & (liabilities) Contingent consideration (liabilities) Balance at June 30, 2019 $ — $ 88.0 $ (3.6 ) $ (30.8 ) Total realized and unrealized gains (losses) — (0.3 ) (2.0 ) (2.1 ) Foreign currency gains (losses) through Other Comprehensive Income — (1.0 ) — — Purchases 17.0 — — — Sales/Settlements — (6.0 ) 3.4 6.9 Balance at September 30, 2019 $ 17.0 $ 80.7 $ (2.2 ) $ (26.0 ) (1) Excludes fair value of $287.7 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. For the three months ended September 30, 2018 (Millions) Fixed Maturities Other long-term investments (1) Derivative instruments assets & (liabilities) Contingent consideration (liabilities) Balance at June 30, 2018 $ 6.0 $ 69.0 $ (5.8 ) $ (42.8 ) Total realized and unrealized gains (losses) 0.1 (1.6 ) 1.7 — Foreign currency gains (losses) through Other Comprehensive Income — 0.1 — — Purchases 2.4 0.2 — — Sales/Settlements — (0.2 ) (0.7 ) 0.9 Balance at September 30, 2018 $ 8.5 $ 67.5 $ (4.8 ) $ (41.9 ) (1) Excludes fair value of $281.5 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. The following tables present changes in Level 3 for financial instruments measured at fair value for the nine months ended September 30, 2019 and September 30, 2018 : For the nine months ended September 30, 2019 (Millions) Fixed Maturities Other long-term investments (1) Derivative instruments assets & (liabilities) Contingent consideration (liabilities) Balance at December 31, 2018 $ 5.4 $ 63.6 $ (0.5 ) $ (28.8 ) Total realized and unrealized gains (losses) — 10.6 (7.7 ) (4.1 ) Foreign currency gains (losses) through Other Comprehensive Income — (1.5 ) — — Purchases 17.0 15.8 — — Sales/Settlements (5.4 ) (7.8 ) 6.0 6.9 Balance at September 30, 2019 $ 17.0 $ 80.7 $ (2.2 ) $ (26.0 ) (1) Excludes fair value of $287.7 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. For the nine months ended September 30, 2018 (Millions) Fixed Maturities Other long-term investments (1) Derivative instruments assets & (liabilities) Contingent consideration (liabilities) Balance at December 31, 2017 $ 8.0 $ 64.2 $ (6.1 ) $ (42.8 ) Total realized and unrealized gains (losses) (2.0 ) 7.7 7.3 — Foreign currency gains (losses) through Other Comprehensive Income — (1.5 ) — — Purchases 3.0 1.2 — — Sales/Settlements (0.5 ) (4.1 ) (6.0 ) 0.9 Balance at September 30, 2018 $ 8.5 $ 67.5 $ (4.8 ) $ (41.9 ) (1) Excludes fair value of $281.5 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. Fair value measurements – transfers between levels There were no transfers between Level 3 and Level 2 measurements during the three and nine months ended September 30, 2019 and 2018 . Significant unobservable inputs The table below presents information about the significant unobservable inputs used for recurring fair value measurements for certain Level 3 instruments as of September 30, 2019 and December 31, 2018 , and includes only those instruments for which information about the inputs is reasonably available to Sirius Group, such as data from independent third-party valuation service providers and from internal valuation models. (Millions, except share prices) September 30, 2019 Description Valuation Technique(s) Fair value Unobservable input Private equity securities (1) Share price of recent transaction $ 32.5 Purchase share price $ 40.63 Preferred stock (1) Share price of recent transaction $ 17.5 Purchase price $ 7.74 Preferred stock (1) Purchase price of recent transaction $ 12.2 Purchase price $ 12.2 Private equity securities (1) Multiple of GAAP book value $ 16.6 Book value multiple 1.0X Private debt instrument (1) Purchase price of recent transaction $ 7.8 Purchase price $ 9.0 Private equity securities (1) Share price of recent transaction $ 5.1 Purchase price $ 7.74 Preferred stock (1) Purchase price of recent transaction $ 4.8 Purchase price $ 4.8 Weather derivatives (2) Third party appraisal $ 4.0 Broker quote $ 4.0 Private equity securities (1) Purchase price of recent transaction $ 1.0 Purchase price $ 10.0 Equity warrants Option pricing model $ 0.7 Strike price $ 0.2 Private equity securities (1) Purchase price of recent transaction $ 0.2 Purchase price $ 0.2 Currency swaps (1) Third party appraisal $ (1.2 ) Broker quote $ (1.2 ) Currency forwards (1) Third party appraisal $ (5.7 ) Broker quote $ (5.7 ) Contingent consideration External valuation model $ (26.0 ) Discounted future payments $ (26.0 ) (1) As of September 30, 2019 , each asset type consists of one security. (2) See Note 11 for discussion of derivative instruments. (Millions, except share prices) December 31, 2018 Description Valuation Technique(s) Fair value Unobservable input Private equity securities (1) Share price of recent transaction $ 32.5 Purchase share price $ 40.63 Private equity securities (1) Multiple of GAAP book value $ 14.7 Book value multiple 0.9X Private debt instrument (1) Purchase price of recent transaction $ 9.0 Purchase price $ 9.0 Private debt instrument (1) Purchase price of recent transaction $ 6.0 Purchase price $ 6.0 Preferred stock (1) Share price of recent transaction $ 4.6 Purchase price $ 1.88 Weather derivatives (2) Third party appraisal $ 3.9 Broker quote $ 3.9 Private equity securities( 1) Purchase price of recent transaction $ 0.9 Purchase price $ 1.88 Preferred stock (1) Share price of recent transaction $ 0.8 Purchase price $ 0.8 Private equity securities (1) Share price of recent transaction $ 0.3 Purchase price $ 10.0 Private debt instrument (1) Purchase price of recent transaction $ 0.2 Purchase price $ 0.2 Interest rate cap (2) Third party appraisal $ 0.2 Broker quote $ 0.2 Currency swaps (2) Third party appraisal $ (4.6 ) Broker quote $ (4.6 ) Contingent consideration External valuation model $ (28.8 ) Discounted future payments $ (28.8 ) (1) As of December 31, 2018 , each asset type consists of one security. (2) See Note 11 for discussion of derivative instruments. Financial instruments disclosed, but not carried at fair value Sirius Group uses various financial instruments in the normal course of its business. The carrying values of Cash, Accrued investment income, certain other assets, Accounts payable on unsettled investment purchases, certain other liabilities, and other financial instruments not included in the table below approximated their fair values at September 30, 2019 and December 31, 2018 , due to their respective short maturities. As these financial instruments are not actively traded, their respective fair values are classified within Level 3. The following table includes financial instruments for which the carrying value differs from the estimated fair values at September 30, 2019 and December 31, 2018 : September 30, 2019 December 31, 2018 (Millions) Fair Value (1) Carrying Value Fair Value (1) Carrying Value Liabilities, Mezzanine equity, and Non-controlling interest: 2017 SEK Subordinated Notes $ 279.8 $ 276.5 $ 309.5 $ 303.6 2016 SIG Senior Notes $ 397.3 $ 393.8 $ 347.6 $ 393.2 Series B preference shares $ 195.0 $ 236.0 $ 191.7 $ 232.2 (1) Fair value estimated by internal pricing and considered a Level 3 measurement.

Debt and standby letters of cre

Debt and standby letters of credit facilities	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Debt and standby letters of credit facilities	Debt and standby letters of credit facilities Sirius Group's debt outstanding as of September 30, 2019 and December 31, 2018 consisted of the following: (Millions) September 30, 2019 Effective Rate (1) December 31, 2018 Effective Rate (1) 2017 SEK Subordinated Notes, at face value $ 280.2 4.0 % $ 307.6 3.8 % Unamortized issuance costs (3.7 ) (4.0 ) 2017 SEK Subordinated Notes, carrying value 276.5 303.6 2016 SIG Senior Notes, at face value 400.0 4.7 % 400.0 4.7 % Unamortized discount (2.4 ) (2.6 ) Unamortized issuance costs (3.8 ) (4.2 ) 2016 SIG Senior Notes, carrying value 393.8 393.2 Total debt $ 670.3 $ 696.8 (1) Effective rate considers the effect of the debt issuance costs. 2017 SEK Subordinated Notes On September 22, 2017, Sirius Group 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 ("STIBOR") for the relevant interest period plus an applicable margin, payable quarterly in arrears on March 22, June 22, September 22, and December 22 in each year commencing on December 22, 2017, until maturity in September 2047. Beginning on September 22, 2022, the 2017 SEK Subordinated Notes may be redeemed, in whole or in part, at Sirius Group's option. In addition, within 90 days following the occurrence of a Specified Event (as defined below), the 2017 SEK Subordinated Notes may be redeemed, in whole but not in part, at Sirius Group's option. "Specified Event" means (a) an "Additional Amounts Event" in connection with a change in laws, rules or regulations as a result of which Sirius Group is obligated to pay additional amounts on the notes in respect of any withholding or deduction for taxes, (b) a "Tax Event" in connection with a change in laws, rules or regulations as a result of which interest on the notes is no longer fully deductible by Sirius Group for income tax purposes in the applicable jurisdiction (to the extent that such interest was so deductible as of the time of such Tax Event), (c) a "Rating Methodology Event" in connection with a change in, or clarification to, the rating methodology of Standard & Poor's or Fitch that results in a materially unfavorable capital treatment of the notes, or (d) a "Regulatory Event" in connection with a change in, or clarification to, applicable supervisory regulations that results in the notes no longer qualifying as Tier 2 Capital. Sirius Group incurred $4.6 million in expenses related to the issuance of the 2017 SEK Subordinated Notes (including SEK 27.5 million , or $3.5 million , in underwriting fees), which have been deferred and are being recognized into interest expense over the life of the 2017 SEK Subordinated Notes. For the three months ended September 30, 2019 and 2018 , Sirius Group recognized $15.9 million and $(1.6) million , respectively, of foreign currency exchange gains (loss) on the remeasurement of the 2017 SEK Subordinated Notes into USD from SEK. For the nine months ended September 30, 2019 and 2018 , Sirius Group recognized $27.2 million and $26.2 million , respectively, of foreign currency exchange gains on the remeasurement of the 2017 SEK Subordinated Notes into USD from SEK. Taking into effect the amortization of all underwriting and issuance expenses, and applicable STIBOR, the 2017 SEK Subordinated Notes yielded an effective rate of approximately 4.1% and 3.5% annualized for the three months ended September 30, 2019 and 2018 , respectively. The effective rate for the nine months ended September 30, 2019 and 2018 were 4.0% and 3.5% annualized, respectively. Sirius Group recorded $3.0 million and $2.9 million of interest expense, inclusive of amortization of issuance costs on the 2017 SEK Subordinated Notes for the three months ended September 30, 2019 and 2018 , respectively. Sirius Group recorded $8.9 million and $8.8 million of interest expense, inclusive of amortization of issuance costs on the 2017 SEK Subordinated Notes for the nine months ended September 30, 2019 and 2018 , respectively. 2016 SIG Senior Notes On November 1, 2016, Sirius Group issued $400.0 million face value of senior unsecured notes ("2016 SIG Senior Notes") at an issue price of 99.209% 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, in each year commencing on May 1, 2017, until maturity in November 2026. Sirius Group incurred $5.1 million in expenses related to the issuance of the 2016 SIG Senior Notes (including $3.4 million in underwriting fees), which have been deferred and are being recognized into interest expense over the life of the 2016 SIG Senior Notes. Taking into effect the amortization of the original issue discount and all underwriting and issuance expenses, the 2016 SIG Senior Notes yield an effective rate of approximately 4.7% per annum. Sirius Group recorded $4.8 million , inclusive of amortization of issuance costs on the 2016 SIG Senior Notes, for both three month periods ended September 30, 2019 and 2018 . Sirius Group recorded $ 14.3 million of interest expense, inclusive of amortization of issuance costs on the 2016 SIG Senior Notes, for both the nine months ended September 30, 2019 and 2018 . Standby letter of credit facilities On November 9, 2018, Sirius International Insurance Corporation ("Sirius International"), a wholly owned subsidiary of the Company, renewed two standby letter of credit facility agreements totaling $160 million to provide capital support for Lloyd's Syndicate 1945. The first letter of credit is a renewal of a $125 million facility with Nordea Bank Finland Abp, London Branch, which is issued on an unsecured basis. The second letter of credit is a $35 million facility with DNB Bank ASA, Sweden Branch, $25 million of which is issued on an unsecured basis. Each facility is renewable annually. 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, maximum debt to capitalization standards, and change in control provisions. Sirius International has other secured letter of credit and trust arrangements with various financial institutions to support its insurance operations. As of September 30, 2019 and December 31, 2018 , these secured letter of credit and trust arrangements were collateralized by pledged assets and assets in trust of SEK 2.9 billion and SEK 2.9 billion , respectively, or $300.5 million and $321.3 million , respectively (based on the September 30, 2019 and December 31, 2018 SEK to USD exchange rates). As of September 30, 2019 and December 31, 2018 , Sirius America Insurance Company's trust arrangements were collateralized by pledged assets and assets in trust of $57.5 million and $56.2 million , respectively. As of September 30, 2019 and December 31, 2018 , Sirius Bermuda's trust arrangements were collateralized by pledged assets and assets in trust of $350.6 million and $319.7 million , respectively. Revolving credit facility In February 2018, Sirius Group, through its indirectly wholly-owned subsidiary Sirius International Group, Ltd. entered into a three -year, $300 million senior unsecured revolving credit facility (the "Facility"). 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 and retrocessional agreements. The Facility is subject to various affirmative, negative and financial covenants that Sirius Group considers to be customary for such borrowings, including certain minimum net worth, maximum debt to capitalization, financial strength rating standards, and change in control provisions. As of September 30, 2019 , there were no outstanding borrowings under the Facility. Debt and standby letter of credit facility covenants As of September 30, 2019 , Sirius Group was in compliance with all of the covenants under the 2017 SEK Subordinated Notes, the 2016 SIG Senior Notes, the Nordea Bank Finland Abp, London Branch facility, and the DNB Bank ASA, Sweden Branch facility. In addition, as of September 30, 2019 , Sirius Group was in compliance with all of the covenants under the Facility. Interest Total interest expense incurred by Sirius Group for its indebtedness for the three months ended September 30, 2019 and 2018 was $7.7 million and $7.6 million , respectively. Total interest expense incurred by Sirius Group for its indebtedness for the nine months ended September 30, 2019 and 2018 was $23.3 million and $23.1 million , respectively. Total interest paid by Sirius Group for its indebtedness for the three months ended September 30, 2019 and 2018 was $2.8 million and $2.9 million , respectively. Total interest paid by Sirius Group for its indebtedness for the nine months ended September 30, 2019 and 2018 was $17.7 million and $17.9 million , respectively.

Income taxes

Income taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income taxes	Income taxes The Company and its Bermuda-domiciled subsidiaries are not subject to Bermuda income tax under current Bermuda law. In the event there is a change in the current law such that taxes are imposed, the Company and its Bermuda-domiciled subsidiaries would be exempt from such tax until March 31, 2035, pursuant to the Bermuda Exempted Undertakings Tax Protection Act of 1966. 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, Denmark, Germany, Gibraltar, Hong Kong (China), Luxembourg, Malaysia, the Netherlands, Shanghai (China), Singapore, Spain, Sweden, Switzerland, the United Kingdom, and the United States. Sirius Group reported an income tax expense (benefit) of $(3.7) million and $(6.9) million during the three months ended September 30, 2019 and 2018 , respectively, on pre-tax income (loss) of $(11.3) million and $(34.6) million , respectively. Sirius Group reported an income tax expense of $15.6 million and $55.4 million during the nine months ended September 30, 2019 and 2018 , respectively, on pre-tax income of $120.3 million and $169.2 million , respectively. The effective tax rate for the nine months ended September 30, 2019 was 13.0% , which was lower than the Swedish statutory rate of 21.4% (the rate at which the majority of Sirius Group's worldwide operations are taxed) primarily because of income recognized in jurisdictions with lower rates than Sweden. The effective tax rate for the nine months ended September 30, 2018 was 32.7% , which was higher than the Swedish statutory rate of 22% (the rate at which the majority of Sirius Group's worldwide operations are taxed) primarily because of non-recurring adjustments to Sirius Group's deferred tax assets which resulted from various internal restructurings and changes in Sirius Group's accounting for uncertain tax positions. In arriving at the effective tax rate for the nine month periods ended September 30, 2019 and 2018 , Sirius Group forecasted all income and expense items including the change in unrealized investment gains (losses) and realized investment gains (losses) for the years ending December 31, 2019 and 2018 . The Tax Cuts and Jobs Act (the "TCJA") was enacted into law in the U.S. in December 2017. The Company previously applied Staff Accounting Bulletin 118 ("SAB 118"), which provided guidance on accounting for the tax effects of the TCJA. SAB 118 addresses situations where accounting for certain income tax effects of the TCJA under ASC 740, Income Taxes ("ASC 740"), may be incomplete upon issuance of an entity's financial statements and provides a one-year measurement period from the enactment date to complete the accounting under ASC 740. The Company has completed its accounting for all material tax effects of the TCJA and recognized adjustments as of December 31, 2018 . The TCJA includes a new Base Erosion and Anti-Abuse Minimum Tax ("BEAT") provision, which is essentially a minimum tax that is potentially applicable to certain otherwise deductible payments made by U.S. entities to non-U.S. affiliates, including cross-border interest payments and reinsurance premiums. The statutory BEAT rate is 10% in 2019-2025, 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, Sirius Group 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 September 30, 2019 and December 31, 2018 . Sirius Group 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 Sirius Group's subsidiaries, as dividends or otherwise, they may be subject to income or withholding taxes. Sirius Group 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 response to guidance from the Organisation for Economic Cooperation and Development. Accordingly, such payments or earnings 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. Deferred tax asset, net of valuation allowance Sirius Group's net deferred tax liability, net of the valuation allowance as of September 30, 2019 is $45.8 million . Of the $45.8 million , $33.6 million relates to net deferred tax assets in U.S. subsidiaries, $118.5 million relates to net deferred tax assets in Luxembourg subsidiaries, $13.6 million relates to net deferred tax assets in United Kingdom subsidiaries, $208.6 million relates to net deferred tax liabilities in Sweden subsidiaries, and $2.9 million relates to other net deferred tax liability. Sirius Group records a valuation allowance against deferred tax assets if it becomes more likely than not that all or a portion of a deferred tax asset 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, Sirius Group 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 Sirius Group's deferred tax assets and tax expense. 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, Sirius Group 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. As of September 30, 2019 , the total reserve for unrecognized tax benefits is $59.1 million . If Sirius Group determines in the future that its reserves for unrecognized tax benefits on permanent differences and interest and penalties are not needed, the reversal of $58.9 million of such reserves as of September 30, 2019 would be recorded as an income tax benefit and would impact the effective tax rate. If Sirius Group determines in the future that its reserves for unrecognized tax benefits on temporary differences are not needed, the reversal of $0.2 million of such reserves as of September 30, 2019 would not impact the effective tax rate due to deferred tax accounting but would accelerate the payment of cash to the taxing authority. The vast majority of Sirius Group's reserves for unrecognized tax benefits on temporary differences relate to deductions for loss reserves where the timing of the deductions is uncertain. The Swedish Tax Authority ("STA") has denied deductions claimed by two of the Company's Swedish subsidiaries in certain tax years for interest paid on intra-group debt instruments. Sirius Group has challenged the STA's denial in court based on the technical merits. In October 2018, one of the Swedish subsidiaries received an adverse decision from Sweden's Administrative Court, which Sirius Group has appealed. Sirius Group has taken into account this and other relevant developments in applicable Swedish tax law and has established a reserve for this uncertain tax position. As of September 30, 2019 , the total amount of such reserve was $56.2 million . In connection with this matter, Sirius Group has also taken into account the Stock Purchase Agreement ("SPA") by which Sirius Group was sold to CMIG International Holding Pte. Ltd ("CMIG International") in 2016 and has recorded an indemnification asset. Pursuant to the SPA, the seller agreed to indemnify the buyer and Sirius Group for, among other things, (1) any additional tax liability in excess of Sirius Group's accounting for uncertain tax positions for tax periods prior to the sale of Sirius Group to CMIG International, and (2) an impairment in Sirius Group's net deferred tax assets resulting from a final determination by a tax authority. While Sirius Group intends to continue challenging the STA's denial based on the technical merits (including appealing the adverse court decision received in October 2018), the ultimate resolution of these tax disputes is uncertain and no assurance can be given that there will be no material changes to Sirius Group's operating results or balance sheet in connection with these uncertain tax positions or the related indemnification. With few exceptions, Sirius Group is no longer subject to U.S. federal, state or non-U.S. income tax examinations by tax authorities for years before 2014.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives Interest Rate Cap Sirius Group entered into an interest rate swap ("Interest Rate Cap") 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 at the time of payment. The Interest Rate Cap does not qualify for hedge accounting. Changes in fair value are recognized as unrealized gains or losses and are presented within Other revenue. The fair value of the interest rate cap has been estimated using a single broker quote and, accordingly, has been classified as a Level 3 measurement as of September 30, 2019 and December 31, 2018 . Collateral held is recorded within short-term investments with an equal amount recognized as a liability to return collateral. Sirius Group's liability to return that collateral is based on the amounts provided by the counterparties and investment earnings thereon. As at September 30, 2019 and December 31, 2018 , Sirius Group held collateral balances of $0.2 million and $0.3 million , respectively. Foreign currency swaps Sirius Group executes foreign currency swaps to manage foreign currency exposure. The foreign currency swaps have not been designated or accounted for under hedge accounting. Changes in fair value are recognized as unrealized gains or losses and are presented within Net foreign exchange gains (losses). The fair value of the foreign currency swaps has been estimated using a single broker quote and, accordingly, has been classified as a Level 3 measurement as of September 30, 2019 and December 31, 2018 . Sirius Group does not provide or hold any collateral associated with the swaps. Foreign currency forward Sirius Group executes foreign currency forwards to manage currency exposure against a foreign currency investment. The foreign currency forwards are not designated or accounted for under hedge accounting. Changes in fair value are recognized as unrealized gains or losses and are presented within Net foreign exchange gains (losses). The fair value of the foreign currency forwards are estimated using a single broker quote and accordingly, classified as a Level 3 measurement. Sirius Group did not provide or hold any collateral associated with the forwards. Weather derivatives Sirius Group 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, Sirius Group's weather and weather contingent derivatives are not designed to meet the criteria for hedge accounting under GAAP. Sirius Group 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 recognized as unrealized gains or losses and are presented within Other revenue. The fair value of the weather derivatives was estimated using a broker quote. Because of the significance of the unobservable inputs used to estimate the fair value of Sirius Group'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 September 30, 2019 and December 31, 2018 . Sirius Group does not provide or hold any collateral associated with the weather derivatives. Equity futures contracts Sirius Group executes trades in equity futures contracts to hedge against long positions in Common equities. The equity futures contracts are not designated or accounted for under hedge accounting. Changes in fair value are presented within Net realized investment gains (losses). The fair value of the equity put options is widely available and have quoted prices in active markets and accordingly, were classified as a Level 1 measurement. Equity put options Sirius Group executes trades in equity put options to hedge against long positions in Common equities. The equity put options are not designated or accounted for under hedge accounting. Changes in fair value are presented within Net unrealized investment (losses) gains. The fair value of the equity put options is widely available and have quoted prices in active markets and accordingly, were classified as a Level 1 measurement. Equity warrants Sirius Group holds restricted equity warrants as part of its investment strategy. The equity warrants are not designated or accounted for under hedge accounting. Changes in fair value are presented within Net unrealized investment (losses) gains. The fair value of the equity warrants is estimated using a single broker quote and accordingly, classified as a Level 3 measurement. Sirius Group did not provide or hold any collateral associated with the equity warrants. The following tables summarize 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 at September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Derivatives not designated as hedging instruments Notional Value Asset derivative at fair value (1) Liability derivative at fair value (2) Notional Value Asset derivative at fair value (1) Liability derivative at fair value (2) Interest rate cap $ 250.0 $ — $ — $ 250.0 $ 0.2 $ — Foreign currency swaps $ 90.0 $ — $ 1.2 $ 45.0 $ — $ 4.6 Foreign currency forwards $ (5.0 ) $ — $ 5.7 $ — $ — $ — Weather derivatives $ 95.5 $ 4.0 $ — $ 150.5 $ 3.9 $ — Equity futures contracts $ 1.8 $ — $ — $ — $ — $ — Equity put options $ 23.4 $ 1.9 $ 0.3 $ 6.2 $ — $ 0.5 Equity warrants $ 0.7 $ 0.7 $ — $ — $ — $ — (1) Asset derivatives are classified within Other assets within the Company's Consolidated Balance Sheets at September 30, 2019 and December 31, 2018 . (2) Liability derivatives are classified within Other liabilities within the Company's Consolidated Balance Sheets at September 30, 2019 and December 31, 2018 . The following table summarizes information on the classification and net impact on earnings, recognized in the Company's Consolidated Statements of Income relating to derivatives during the three months and nine months ended September 30, 2019 and 2018 : (Millions) For the three months ended September 30, For the nine months ended September 30, Derivatives not designated as hedging instruments Classification of gains (losses) recognized in earnings 2019 2018 2019 2018 Interest rate cap Other revenues $ — $ — $ (0.2 ) $ 0.2 Foreign currency swaps Net foreign exchange gains $ 3.7 $ (0.1 ) $ 6.1 $ 2.9 Foreign currency forwards Net foreign exchange gains (losses) $ (7.8 ) $ — $ (10.8 ) $ — Weather derivatives Other revenues $ 1.9 $ 1.8 $ (3.6 ) $ 4.2 Equity futures contracts Net realized investment gains (losses) $ 0.1 $ — $ (0.7 ) $ — Equity futures contracts Net unrealized investment gains $ (0.5 ) $ — $ (0.6 ) $ — Equity put options Net realized investment gains (losses) $ (0.8 ) $ — $ (0.8 ) $ — Equity put options Net unrealized investment gains $ 0.7 $ — $ 0.2 $ — Equity warrants Net unrealized investment gains $ 0.3 $ — $ 0.7 $ —

Share-based compensation

Share-based compensation	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation	Share-based compensation Sirius Group's employee compensation plans include grants for various types of share-based and non-share-based compensation awards to key employees of Sirius Group. As at September 30, 2019 , Sirius Group's share-based compensation awards consist of performance shares units, restricted share units, restricted stock and options. For the three and nine months ended September 30, 2019 , Sirius Group granted members of the Board of Directors of the Company 2,424 restricted shares and 37,039 restricted shares, respectively. For the three months ended September 30, 2019 , Sirius Group granted 7,059 performance share units, 16,471 restricted share units, and 2,424 restricted shares. For the nine months ended September 30, 2019 , Sirius Group granted 408,370 performance share units, 1,428,185 restricted share units, 1,374,944 officer stock options and 37,039 restricted shares. During the three months ended September 30, 2019 , Sirius Group employees forfeited 43,230 performance share units and 25,936 restricted share units. During the nine months ended September 30, 2019 , Sirius Group employees forfeited 57,565 performance share units and 71,988 restricted share units. As at September 30, 2019 there were $27.1 million of unrecognized share-based compensation costs, which are expected to be recognized over the next two to three years . There were no unrecognized share-based compensation costs as at September 30, 2018 .

Common shareholder's equity, me

Common shareholder's equity, mezzanine equity, and non-controlling interests	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Common shareholder's equity, mezzanine equity, and non-controlling interests	Common shareholder's equity, mezzanine equity, and non-controlling interests Common shareholder's equity The authorized share capital of the Company consists of 500,000,000 Common shares, $0.01 par value per share, and 100,000,000 Preference shares, $0.01 par value per share. The following table presents changes in the Company's issued and outstanding Common shares as of September 30, 2019 and 2018 , respectively: Three months ended September 30, Nine months ended September 30, (Millions) 2019 2018 2019 2018 Common shares: Shares issued and outstanding, beginning of period 115,296,918 120,000,000 115,151,251 120,000,000 Issuance of shares to directors and employees 2,424 — 148,091 — Shares issued and outstanding, end of period 115,299,342 120,000,000 115,299,342 120,000,000 Dividends The Company did not pay dividends to common shareholders during the three and nine months ended September 30, 2019 and 2018 . Mezzanine equity Series B Preference Shares On November 5, 2018, in connection with the closing of the Merger, Sirius Group issued 11,901,670 of the 15,000,000 designated Series B preference shares, with a par value of $0.01 per share, as part of the Sirius Group Private Placement. (See Note 3.) The Series B preference shares rank senior to common shares with respect to dividend rights, rights of liquidation, winding-up, or dissolution of the Company and junior to all of the Company's existing and future policyholder obligations and debt obligations. Without the consent of the holders of the Series B preference shares, the Company may not issue any class or series of shares that rank senior or pari passu with the Series B preference shares as to the payment of dividends or as to distribution of assets upon any voluntary or involuntary liquidation, winding-up or dissolution of the Company, if the aggregate gross proceeds from the issuance of all such senior or pari passu shares equals or exceeds $100 million . The Company adjusts the carrying value of the Series B preference shares to equal the redemption value at the end of each reporting period. At September 30, 2019 and December 31, 2018 , the balance of the Series B preference shares was $ 236.0 million and $232.2 million , respectively. Series A Redeemable Preference Shares In connection with the acquisition of IMG, the Company issued mandatorily convertible stock in the form of Series A redeemable preference shares as a portion of the consideration paid. The Company issued 100,000 of the 150,000 authorized Series A redeemable preference shares to the seller of IMG. Each Series A redeemable preference share has a liquidation preference per share of $ 1,000 . On November 5, 2018, in connection with the closing of the Merger, the Company redeemed the 100,000 outstanding shares of Series A redeemable preference shares for $95.0 million . Sirius Group recorded a $13.8 million gain on the redemption of the Series A redeemable preference shares. Non-controlling interests Non-controlling interests consist of the ownership interests of non-controlling shareholders in consolidated entities and are presented separately on the balance sheet. At September 30, 2019 and December 31, 2018 Sirius Group's balance sheet included $3.4 million and $1.7 million , respectively, in non-controlling interests. The following tables show the change in non-controlling interest for the three months and nine months ended September 30, 2019 and 2018 : (Millions) For the three months ended September 30, 2019 For the three months ended September 30, 2018 Non-controlling interests, beginning of the period $ 3.0 $ 1.0 Net income attributable to non-controlling interests 0.4 0.3 Other, net — (0.2 ) Non-controlling interests, end of the period $ 3.4 $ 1.1 (Millions) For the nine months ended September 30, 2019 For the nine months ended September 30, 2018 Non-controlling interests, beginning of the period $ 1.7 $ 0.2 Net income attributable to non-controlling interests 1.6 0.9 Other, net 0.1 — Non-controlling interests, end of the period $ 3.4 $ 1.1 Alstead Re As of September 30, 2019 and December 31, 2018 , Sirius Group recorded non-controlling interest of $ 3.3 million and $ 1.7 million, respectively, in Alstead Re Insurance Company ("Alstead Re"). (See Note 16 .)

Earnings per share

Earnings per share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings per share	Earnings per share Basic earnings per share is computed by dividing net income available to Sirius Group common shareholders by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income (loss) available to Sirius Group common shareholders on a diluted basis by the weighted-average number of common shares outstanding adjusted to give effect to potentially dilutive securities. The Series B preference shares and the Series A redeemable preference shares both qualify as participating securities, which requires the application of the two-class method to compute both basic and diluted earnings per share. The two-class method is an earnings allocation formula that treats participating securities as having rights to earnings that would otherwise have been available to common shareholders. The Series B preference shares and the Series A redeemable preference shares have no obligation to absorb losses of the Company in periods of net loss. The following table sets forth the computation of basic and diluted earnings per common share for the three months and nine months ended September 30, 2019 and 2018 : For the three months ended September 30, For the nine months ended September 30, (Millions, except share and per share information) 2019 2018 2019 2018 Basic earnings per share Numerator: Net income $ (7.6 ) $ (27.7 ) $ 104.7 $ 113.8 Less: Income attributable to non-controlling interests (0.4 ) (0.3 ) (1.6 ) (0.9 ) Less: Change in carrying value of Series B preference shares 5.3 — (3.9 ) — Less: Accrued dividends on Series A redeemable preference shares — — — (2.6 ) Net income available for dividends out of undistributed earnings $ (2.7 ) $ (28.0 ) $ 99.2 $ 110.3 Less: Earnings attributable to Series B preference shares — — (9.3 ) — Less: Earnings attributable to Series A redeemable preference shares — — — (4.5 ) Net income available to Sirius Group common shareholders $ (2.7 ) $ (28.0 ) $ 89.9 $ 105.8 Denominator: Weighted average shares outstanding for basic earnings per share 115,251,853 120,000,000 115,225,942 120,000,000 Basic earnings per share $ (0.02 ) $ (0.23 ) $ 0.78 $ 0.88 Diluted earnings per share Numerator: Net income available to Sirius Group common shareholders $ (2.7 ) $ (28.0 ) $ 89.9 $ 105.8 Add: Change in carrying value of Series B preference shares (5.3 ) — — — Net income available to Sirius Group common shareholders on a diluted basis $ (8.0 ) $ (28.0 ) $ 89.9 $ 105.8 Denominator: Weighted average shares outstanding for basic earnings per share 115,251,853 120,000,000 115,225,942 120,000,000 Add: Series B preference shares 11,901,670 — — — Add: Unvested performance share units and restricted share units — — 393,280 — Weighted average shares outstanding for diluted earnings per share (1) 127,153,523 120,000,000 115,619,222 120,000,000 Diluted earnings per share $ (0.06 ) $ (0.23 ) $ 0.78 $ 0.88 (1)For the three months ended September 30, 2019 , there were a total of 19,537,270 potentially dilutive securities excluded from the calculation of Diluted earnings per share. For the nine months ended September 30, 2019 , there were a total of 31,045,660 potentially dilutive securities excluded from the calculation of Diluted earnings per share. As at September 30, 2018 , there were no potentially dilutive securities excluded from the calculation of Diluted earnings per share.

Investments in unconsolidated e

Investments in unconsolidated entities	9 Months Ended
	Sep. 30, 2019
Investments in unconsolidated entities
Investments in unconsolidated entities	Investments in unconsolidated entities Sirius Group'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 Sirius Group the ability to exert significant influence over the investee's operating and financial policies ("equity method eligible unconsolidated entities"). Such investments may be accounted for under either the equity method or, alternatively, Sirius Group may elect to account for them under the fair value option. The following table presents the components of Other long-term investments as of September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Equity method eligible unconsolidated entities, at fair value $ 143.5 $ 169.4 Other unconsolidated investments, at fair value (1) 224.9 195.6 Total Other long-term investments (2) $ 368.4 $ 365.0 (1)Includes Other long-term investments that are not equity method eligible. (2)There were no investments accounted for using the equity method as of September 30, 2019 and December 31, 2018 Equity method eligible unconsolidated entities, at fair value Sirius Group has elected the fair value option to account for its equity method eligible investments accounted for as part of Other long-term investments for consistency of presentation with the rest of its investment portfolio. The following table presents Sirius Group's investments in equity method eligible unconsolidated entities as of September 30, 2019 and December 31, 2018 with ownership interest greater than 20% : Ownership interest at Investee September 30, 2019 December 31, 2018 Instrument Held BE Reinsurance Limited 25.0 % 25.0 % Common shares BioVentures Investors (Offshore) IV LP 73.0 % 73.0 % Units Camden Partners Strategic Fund V (Cayman), LP 36.3 % 36.4 % Units NEC Cypress Buyer LLC (1) 13.3 % 13.3 % Units New Energy Capital Infrastructure Credit Fund LP 23.3 % 22.9 % Units New Energy Capital Infrastructure Offshore Credit Fund LP 56.2 % 54.9 % Units Scion G7, LP 28.8 % 28.8 % Units Tuckerman Capital V LP 48.2 % 47.6 % Units Tuckerman Capital V Co-Investment I LP 47.7 % 47.7 % Units (1)The ownership percentage of NEC Cypress Buyer LLC is less than 20% at September 30, 2019 and December 31, 2018, but is included in the table as it is a subsidiary investment within the New Energy Capital Credit Funds, which are equity method eligible.

Variable interest entities

Variable interest entities	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable interest entities	Variable interest entities Sirius Group consolidates the results of operations and financial position of every voting interest entity ("VOE") 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. Sirius Group has determined that Alstead Re is a VIE for which Sirius Group is the primary beneficiary and is required to consolidate it. The following table presents Alstead Re's assets and liabilities, as classified in the Consolidated Balance Sheets as at September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Assets: Fixed maturity investments, trading at fair value $ 3.9 $ 4.0 Short-term investments, at fair value 0.5 0.3 Cash 0.1 0.2 Total investments 4.5 4.5 Insurance and reinsurance premiums receivable (0.3 ) 0.1 Funds held by ceding companies 4.6 3.7 Deferred acquisition costs 0.3 5.2 Other assets 0.1 0.9 Total assets $ 9.2 $ 14.4 Liabilities Loss and loss adjustment expense reserves $ 0.8 $ 4.6 Unearned insurance and reinsurance premiums 0.6 3.7 Other liabilities 0.1 — Total liabilities $ 1.5 $ 8.3 Sirius Group is a passive investor in certain third-party-managed hedge and private equity funds, some of which are VIEs. Sirius Group 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. Sirius Group 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 Sirius Group has also provided credit protection to the VIE with the VIE as the referenced obligation, and (iii) other commitments and guarantees to the VIE. Sirius Group 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 Sirius Group holds a variable interest, as well as the maximum exposure to loss associated with these VIEs: Maximum Exposure to Loss (Millions) Total VIE Assets On-Balance Sheet Off-Balance Sheet Total September 30, 2019 Other long-term investments (1) $ 278.8 $ 114.2 $ 17.9 $ 132.1 Total at September 30, 2019 $ 278.8 $ 114.2 $ 17.9 $ 132.1 December 31, 2018 Other long-term investments (1) $ 209.1 $ 103.1 $ 32.0 $ 135.1 Total at December 31, 2018 $ 209.1 $ 103.1 $ 32.0 $ 135.1 (1)Comprised primarily of hedge funds and private equity funds.

Transactions with related parti

Transactions with related parties	9 Months Ended
	Sep. 30, 2019
Related Party Transactions [Abstract]
Transactions with related parties	Transactions with related parties (Re)insurance contracts In the normal course of business, Sirius Group enters into insurance and reinsurance contracts with certain of its insurance and MGU affiliates, or their subsidiaries. During the three and nine months ended September 30, 2019 , these contracts resulted in gross written premiums of $21.7 million and $70.7 million , respectively. During the three and nine months ended September 30, 2018 , these contracts resulted in gross written premiums of $14.0 million and $52.2 million , respectively. As at September 30, 2019 and December 31, 2018 , Sirius Group had total receivables due from affiliates of $24.1 million and $14.3 million , respectively. As at September 30, 2019 Sirius Group had total payables due to affiliates of $ 0.4 million. At December 31, 2018 , Sirius Group did not have any payables due to affiliates. Other Meyer "Sandy" Frucher ("Mr. Frucher") is the Company's Interim Chairman of the board of directors and is also Vice Chairman of Nasdaq, Inc. ("Nasdaq"). The Company is traded on the Nasdaq Global Select Market and has business transactions that are related to its listing on the exchange under the normal course of business. (See Note 3 .) On October, 21, 2019, Nasdaq announced Mr. Frucher will conclude his tenure as Vice Chairman of Nasdaq and will assume the role of Strategic Advisor, effective January 1, 2020.

Commitments and contingencies

Commitments and contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	Commitments and contingencies Legal Proceedings Sirius Group, and the insurance and reinsurance industry in general, are routinely subject to claims related litigation and arbitration in the normal course of business, as well as litigation and arbitration that do not arise from, or are directly related to, claims activity. Sirius Group estimates of the costs of settling matters routinely encountered in claims activity are reflected in the reserves for unpaid loss and LAE. (See Note 5 .) Sirius Group considers the requirements of ASC 450, Contingencies ("ASC 450"), when evaluating its exposure to non-claims related litigation and arbitration. ASC 450 requires that accruals be established for litigation and arbitration if it is probable that a loss has been incurred and it can be reasonably estimated. ASC 450 also requires that litigation and arbitration be disclosed if it is probable that a loss has been incurred or it there is a reasonable possibility that a loss may have been incurred. Leases Sirius Group leases office space and equipment under various noncancelable operating lease agreements. The average life of the office leases is 7 years and the equipment leases is 3 years . During the three and nine months ended September 30, 2019 , Sirius Group recognized operating lease expense of $3.4 million and $9.3 million , respectively, including property taxes and routine maintenance expense as well as rental expenses related to short term leases. As at September 30, 2019 , Sirius Group had $28.8 million operating lease right-of-use assets included in Other assets. As at September 30, 2019 , Sirius Group had $30.7 million operating lease liability included in Other liabilities. The following table presents the lease balances within the Consolidated Balance Sheets as at September 30, 2019 : (millions) Balance Sheet Classification September 30, 2019 Operating lease right-of-use assets Other assets $28.8 Current lease liabilities Other liabilities $8.5 Non-current lease liabilities Other liabilities $22.2 The following table presents weighted average remaining lease term and weighted average discount rate as at September 30, 2019 : Weighted average lease term (years) as at September 30, 2019 Leased offices 7 years Leased equipment 3 years Weighted average discount rate: Leased offices 3.7 % Leased equipment 3.4 % The following table presents future annual minimum rental payments required under non-cancellable leases and the present value discount to arrive at total lease liability as at September 30, 2019 : (Millions) Future Payments 2019 $ 2.5 2020 9.0 2021 7.8 2022 6.9 2023 4.3 2024 and after 2.8 Total future annual minimum rental payments as at September 30, 2019 33.3 Less: present value discount (2.6 ) Total lease liability as at September 30, 2019 $ 30.7 As of September 30, 2019 , the Company's future operating lease obligations that have not yet commenced are immaterial.

Summary of significant accoun_2

Summary of significant accounting policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation The accompanying Unaudited Consolidated Financial Statements at September 30, 2019 , have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") and the rules and regulations of the U.S. Securities and Exchange Commission ("SEC") for interim financial information. The accompanying Unaudited Consolidated Financial Statements present the consolidated results of operations, financial condition, and cash flows of the Company and its subsidiaries and those entities in which the Company has control and a majority economic interest as well as those variable interest entities ("VIEs") that meet the requirements for consolidation. All intercompany transactions have been eliminated in consolidation. These Unaudited Consolidated Financial Statements do not include all disclosures normally included in annual financial statements prepared in accordance with GAAP and should be read in conjunction with the Audited Consolidated Financial Statements and the related notes for the year ended December 31, 2018 . The consolidated financial information as of December 31, 2018 included herein has been derived from the Audited Consolidated Financial Statements as of December 31, 2018 . The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the opinion of management, the accompanying Unaudited Consolidated Financial Statements reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of results on an interim basis. Tabular dollar amounts are in millions, with the exception of share and per share amounts. All amounts are reported in U.S. dollars, except where noted otherwise.
Recently adopted changes in accounting principles	Recently adopted changes in accounting principles Leases Effective January 1, 2019, Sirius Group adopted Accounting Standards Update ("ASU") 2016-2, Leases (Accounting Standards Codification ("ASC") 842) which requires lessees to recognize lease assets and liabilities on the balance sheet for both operating and financing leases, with the exception of leases with an original term of 12 months or less. Under previous guidance, recognition of lease assets and liabilities was not required for operating leases. The new guidance requires that lease assets and liabilities to be recognized and measured initially based on the present value of the lease payments. Sirius Group adopted the new guidance using the simplified transition option that allows companies to apply the new lease standard at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. Sirius Group also made the following elections: • Sirius Group elected the package of practical expedients to not reassess prior conclusions related to contracts containing leases, lease classification and initial direct costs for all leases upon transition. • Sirius Group did not elect the hindsight practical expedient upon transition, for all leases. • Sirius Group elected the short-term lease measurement and recognition exemption, resulting in lease payments being recorded as an expense on a straight-line basis over the lease term. • Sirius Group elected to include both lease and non-lease components as a single component for all leases. • Sirius Group did not elect the land easement practical expedient as it was not applicable. As a result of the adoption of the new guidance, Sirius Group recognized a lease liability of $36.8 million , which represents the present value of our remaining lease payments and a right-of-use asset of $34.4 million as of January 1, 2019. The adoption of this guidance did not materially impact our results of operations or cash flows. Due to the adoption of the standard using the retrospective cumulative-effect adjustment method, there are no changes to our previously reported results prior to January 1, 2019. Lease expense is not expected to change materially as a result of the adoption of the new guidance. (See Note 18 .) Premium amortization on callable debt securities Effective January 1, 2019, Sirius Group adopted ASU 2017-8, Premium Amortization on Purchased Callable Debt Securities (ASC 310-20), which changes the amortization period for certain purchased callable debt securities. Under the new guidance, for investments in callable debt securities held at a premium, the premium will be amortized over the period to the earliest call date. The new guidance does not change the amortization period for callable debt securities held at a discount. The adoption of this guidance did not have a significant effect on our financial statements.
Recent accounting pronouncements	Recent accounting pronouncements Credit losses In June 2016, the Financial Accounting Standards Board issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments (ASC 326), which establishes new guidance for the recognition of credit losses for financial assets measured at amortized cost. The new guidance, which applies to financial assets that have the contractual right to receive cash, including reinsurance receivables and recoverables, requires reporting entities to estimate the credit losses expected over the life of a credit exposure using historical information, current information and reasonable and supportable forecasts that affect the collectability of the financial asset. The new guidance is effective for annual and interim periods beginning after December 15, 2019. Sirius Group is evaluating the expected impact of this new guidance.

Segment information (Tables)

Segment information (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Summary of segment results	The following tables summarize the segment results for the three months ended September 30, 2019 and 2018 : For the three months ended September 30, 2019 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Corporate Elimination Total Gross written premiums $ 153.6 $ 137.4 $ 120.6 $ 2.1 $ — $ 413.7 Net written premiums $ 103.7 $ 104.6 $ 113.2 $ 0.8 $ — $ 322.3 Net earned insurance and reinsurance premiums $ 159.9 $ 115.1 $ 98.7 $ 0.5 $ — $ 374.2 Loss and allocated LAE (1) (184.4 ) (63.6 ) (85.5 ) (0.9 ) — (334.4 ) Insurance and reinsurance acquisition expenses (29.2 ) (32.5 ) (27.1 ) (0.1 ) 13.8 (75.1 ) Technical profit (53.7 ) 19.0 (13.9 ) (0.5 ) 13.8 (35.3 ) Unallocated LAE (2) (5.5 ) (2.0 ) (3.0 ) (0.2 ) (3.5 ) (14.2 ) Other underwriting expenses (14.7 ) (6.8 ) (8.8 ) (1.4 ) (3.7 ) (35.4 ) Underwriting income (73.9 ) 10.2 (25.7 ) (2.1 ) 6.6 (84.9 ) Service fee revenue (3) — 31.0 — — (14.6 ) 16.4 Managing general underwriter unallocated LAE — (4.3 ) — — 4.3 — Managing general underwriter other underwriting expenses — (3.7 ) — — 3.7 — General and administrative expenses, MGU + Runoff & Other (4) — (15.1 ) — (1.2 ) — (16.3 ) Underwriting income (loss), including net service fee income (73.9 ) 18.1 (25.7 ) (3.3 ) — (84.8 ) Net investment income 22.8 Net realized investment (losses) gains 15.3 Net unrealized investment (losses) gains 53.9 Net foreign exchange gains (losses) 4.9 Other revenue (5) (0.1 ) General and administrative expenses (6) (11.7 ) Intangible asset amortization expenses (3.9 ) Interest expense on debt (7.7 ) Pre-tax income $ (11.3 ) Underwriting Ratios Loss ratio 118.8 % 57.0 % 89.7 % NM NM 93.2 % Acquisition expense ratio 18.3 % 28.2 % 27.5 % NM NM 20.1 % Other underwriting expense ratio 9.2 % 5.9 % 8.9 % NM NM 9.5 % Combined ratio (7) 146.3 % 91.1 % 126.1 % NM NM 122.8 % Goodwill and intangible assets (8) $ — $ 576.1 $ — $ 8.1 $ — $ 584.2 (1) Loss and allocated loss adjustment expenses ("LAE") are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (2) Unallocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (3) Service fee revenue is part of Other revenue on the Consolidated Statements of Income (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (4) General and administrative expenses, MGU + Runoff & Other is part of General and administrative expenses on the Consolidated Statements of Income (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (5) Other revenue is presented net of Service fee revenue and is comprised mainly of a change in contingent consideration (see Note 8 ) and gains from derivatives (see Note 11 ) (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (6) General and administrative expenses are presented net of General and administrative expenses, MGU + Runoff & Other (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (7) Ratios considered not meaningful ("NM") to Runoff & Other and Corporate Elimination. (8) Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets. For the three months ended September 30, 2018 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Corporate Elimination Total Gross written premiums $ 203.7 $ 117.1 $ 76.5 $ 0.7 $ — $ 398.0 Net written premiums $ 144.9 $ 87.9 $ 72.6 $ 0.3 $ — $ 305.7 Net earned insurance and reinsurance premiums $ 172.7 $ 89.6 $ 58.4 $ 0.4 $ — $ 321.1 Loss and allocated LAE (1) (173.2 ) (51.3 ) (34.1 ) 10.2 — (248.4 ) Insurance and reinsurance acquisition expenses (30.1 ) (26.7 ) (16.2 ) (0.1 ) 13.9 (59.2 ) Technical profit (30.6 ) 11.6 8.1 10.5 13.9 13.5 Unallocated LAE (2) (3.3 ) (1.7 ) (1.6 ) (0.7 ) (4.7 ) (12.0 ) Other underwriting expenses (17.5 ) (6.4 ) (8.4 ) (1.4 ) (2.0 ) (35.7 ) Underwriting income (51.4 ) 3.5 (1.9 ) 8.4 7.2 (34.2 ) Service fee revenue (3) — 29.3 — — (13.9 ) 15.4 Managing general underwriter unallocated LAE — (4.7 ) — — 4.7 — Managing general underwriter other underwriting expenses — (2.0 ) — — 2.0 — General and administrative expenses, MGU + Runoff & Other (4) — (13.8 ) — (0.8 ) — (14.6 ) Underwriting income (loss), including net service fee income (51.4 ) 12.3 (1.9 ) 7.6 — (33.4 ) Net investment income 21.8 Net realized investment (losses) gains 3.9 Net unrealized investment (losses) gains (11.7 ) Net foreign exchange gains (losses) (0.4 ) Other revenue (5) 1.6 General and administrative expenses (6) (4.9 ) Intangible asset amortization expenses (3.9 ) Interest expense on debt (7.6 ) Pre-tax income $ (34.6 ) Underwriting Ratios Loss ratio 102.2 % 59.2 % 61.1 % NM NM 81.1 % Acquisition expense ratio 17.4 % 29.8 % 27.7 % NM NM 18.4 % Other underwriting expense ratio 10.1 % 7.1 % 14.4 % NM NM 11.1 % Combined ratio (7) 129.7 % 96.1 % 103.2 % NM NM 110.6 % Goodwill and intangible assets (8) $ — $ 600.1 $ — $ 8.1 $ — $ 608.2 (1) Loss and allocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (2) Unallocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (3) Service fee revenue is part of Other revenue on the Consolidated Statements of Income (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (4) General and administrative expenses, MGU + Runoff & Other is part of General and administrative expenses on the Consolidated Statements of Income (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (5) Other revenue is presented net of Service fee revenue and is comprised mainly of gains from derivatives (see Note 11 ) (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (6) General and administrative expenses are presented net of General and administrative expenses, MGU + Runoff & Other (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (7) Ratios considered not meaningful ("NM") to Runoff & Other and Corporate Elimination. (8) Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets. The following tables summarize the segment results for the nine months ended September 30, 2019 and 2018 : For the nine months ended September 30, 2019 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Corporate Elimination Total Gross written premiums $ 720.5 $ 459.5 $ 338.4 $ 4.7 $ — $ 1,523.1 Net written premiums $ 536.6 $ 360.1 $ 310.6 $ 1.5 $ — $ 1,208.8 Net earned insurance and reinsurance premiums $ 463.9 $ 330.0 $ 261.7 $ 1.2 $ — $ 1,056.8 Loss and allocated LAE (1) (378.3 ) (198.6 ) (194.4 ) (4.4 ) — (775.7 ) Insurance and reinsurance acquisition expenses (82.2 ) (95.1 ) (72.2 ) (2.6 ) 36.7 (215.4 ) Technical profit 3.4 36.3 (4.9 ) (5.8 ) 36.7 65.7 Unallocated LAE (2) (10.2 ) (5.5 ) (7.1 ) (0.9 ) (11.1 ) (34.8 ) Other underwriting expenses (47.9 ) (18.8 ) (23.7 ) (4.6 ) (11.2 ) (106.2 ) Underwriting income (loss) (54.7 ) 12.0 (35.7 ) (11.3 ) 14.4 (75.3 ) Service fee revenue (3) — 97.6 — — (39.3 ) 58.3 Managing general underwriter unallocated LAE — (13.7 ) — — 13.7 — Managing general underwriter other underwriting expenses — (11.2 ) — — 11.2 — General and administrative expenses, MGU + Runoff & Other (4) — (46.3 ) — (3.0 ) — (49.3 ) Underwriting income (loss), including net service fee income (54.7 ) 38.4 (35.7 ) (14.3 ) — (66.3 ) Net investment income 67.3 Net realized investment (losses) gains 39.9 Net unrealized investment (losses) gains 143.4 Net foreign exchange gains (losses) 9.4 Other revenue (5) (7.0 ) General and administrative expenses (6) (31.3 ) Intangible asset amortization expenses (11.8 ) Interest expense on debt (23.3 ) Pre-tax income $ 120.3 Underwriting Ratios Loss ratio 83.7 % 61.8 % 77.0 % NM NM 76.7 % Acquisition expense ratio 17.7 % 28.8 % 27.6 % NM NM 20.4 % Other underwriting expense ratio 10.3 % 5.7 % 9.1 % NM NM 10.0 % Combined ratio (7) 111.7 % 96.3 % 113.7 % NM NM 107.1 % Goodwill and intangible assets (8) $ — $ 576.1 $ — $ 8.1 $ — $ 584.2 (1) Loss and allocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (2) Unallocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (3) Service fee revenue is part of Other revenue on the Consolidated Statements of Income (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (4) General and administrative expenses, MGU + Runoff & Other is part of General and administrative expenses on the Consolidated Statements of Income (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (5) Other revenue is presented net of Service fee revenue and is comprised mainly of a change in contingent consideration (see Note 8 ) and (losses) from derivatives (see Note 11 ) (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (6) General and administrative expenses are presented net of General and administrative expenses, MGU + Runoff & Other (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (7) Ratios considered not meaningful ("NM") to Runoff & Other and Corporate Elimination. (8) Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets. For the nine months ended September 30, 2018 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Corporate Elimination Total Gross written premiums $ 875.7 $ 375.0 $ 252.9 $ 14.6 $ — $ 1,518.2 Net written premiums $ 569.1 $ 286.2 $ 228.3 $ 11.8 $ — $ 1,095.4 Net earned insurance and reinsurance premiums $ 476.3 $ 258.4 $ 168.3 $ 11.5 $ — $ 914.5 Loss and allocated LAE (1) (311.8 ) (138.0 ) (87.4 ) 12.3 — (524.9 ) Insurance and reinsurance acquisition expenses (93.5 ) (82.3 ) (44.9 ) (2.3 ) 34.0 (189.0 ) Technical profit 71.0 38.1 36.0 21.5 34.0 200.6 Unallocated LAE (2) (7.7 ) (4.3 ) (4.5 ) (1.6 ) (9.8 ) (27.9 ) Other underwriting expenses (53.0 ) (20.7 ) (24.3 ) (5.2 ) (13.9 ) (117.1 ) Underwriting income 10.3 13.1 7.2 14.7 10.3 55.6 Service fee revenue (3) — 89.5 — — (34.0 ) 55.5 Managing general underwriter unallocated LAE — (9.8 ) — — 9.8 — Managing general underwriter other underwriting expenses — (13.9 ) — — 13.9 — General and administrative expenses, MGU + Runoff & Other (4) — (37.5 ) — (2.9 ) — (40.4 ) Underwriting income (loss), including net service fee income 10.3 41.4 7.2 11.8 — 70.7 Net investment income 51.8 Net realized investment (losses) gains 8.0 Net unrealized investment (losses) gains 29.0 Net foreign exchange gains (losses) 21.7 Other revenue (5) 40.5 General and administrative expenses (6) (17.6 ) Intangible asset amortization expenses (11.8 ) Interest expense on debt (23.1 ) Pre-tax income $ 169.2 Underwriting Ratios Loss ratio 67.1 % 55.1 % 54.6 % NM NM 60.4 % Acquisition expense ratio 19.6 % 31.8 % 26.7 % NM NM 20.7 % Other underwriting expense ratio 11.1 % 8.0 % 14.4 % NM NM 12.8 % Combined ratio (7) 97.8 % 94.9 % 95.7 % NM NM 93.9 % Goodwill and intangible assets (8) $ — $ 600.1 $ — $ 8.1 $ — $ 608.2 (1) Loss and allocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (2) Unallocated LAE are part of Loss and loss adjustment expenses on the Consolidated Statements of Income (the sum of Loss and allocated LAE and Unallocated LAE is equal to Loss and loss adjustment expenses on the Consolidated Statements of Income). (3) Service fee revenue is part of Other revenue on the Consolidated Statements of Income (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (4) General and administrative expenses, MGU + Runoff & Other is part of General and administrative expenses on the Consolidated Statements of Income (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (5) Other revenue is presented net of Service fee revenue and is comprised mainly of the right of indemnification (see Note 10 ), (losses) from derivatives (see Note 11 ), and the termination of the call option to purchase The Phoenix Holdings, Ltd. (the sum of Service fee revenue and Other revenue is equal to Other revenue on the Consolidated Statements of Income). (6) General and administrative expenses are presented net of General and administrative expenses, MGU + Runoff & Other (the sum of General and administrative expenses, MGU + Runoff & Other and General and administrative expenses is equal to General and administrative expenses on the Consolidated Statements of Income). (7) Ratios considered not meaningful ("NM") to Runoff & Other and Corporate Elimination. (8) Sirius Group does not allocate its assets by segment, with the exception of goodwill and intangible assets.
Summary information regarding net premiums written by client location and underwriting location by reportable segment	The following tables provide summary information regarding net premiums written by client location and underwriting location by reportable segment for the three months ended September 30, 2019 and 2018 : For the three months ended September 30, 2019 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Total Net written premiums by client location: United States $ 44.0 $ 87.6 $ 83.1 $ 0.7 $ 215.4 Europe 14.6 5.8 15.1 (0.1 ) 35.4 Canada, the Caribbean, Bermuda and Latin America 19.7 3.7 4.8 0.1 28.3 Asia and Other 25.4 7.5 10.2 0.1 43.2 Total net written premium by client location for the three months ended September 30, 2019 $ 103.7 $ 104.6 $ 113.2 $ 0.8 $ 322.3 Net written premiums by underwriting location: United States $ 7.5 $ 36.9 $ 12.7 $ 0.7 $ 57.8 Europe 45.0 68.1 51.2 — 164.3 Canada, the Caribbean, Bermuda and Latin America 42.3 (0.6 ) 49.0 — 90.7 Asia and Other 8.9 0.2 0.3 0.1 9.5 Total written premiums by underwriting location for the three months ended September 30, 2019 $ 103.7 $ 104.6 $ 113.2 $ 0.8 $ 322.3 For the three months ended September 30, 2018 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Total Net written premiums by client location: United States $ 62.4 $ 71.4 $ 45.3 $ (0.1 ) $ 179.0 Europe 22.8 7.4 15.8 0.1 46.1 Canada, the Caribbean, Bermuda and Latin America 24.7 2.6 2.8 — 30.1 Asia and Other 35.0 6.5 8.7 0.3 50.5 Total net written premium by client location for the three months ended September 30, 2018 $ 144.9 $ 87.9 $ 72.6 $ 0.3 $ 305.7 Net written premiums by underwriting location: United States $ 12.6 $ 27.7 $ 5.8 $ — $ 46.1 Europe 61.3 52.7 36.1 — 150.1 Canada, the Caribbean, Bermuda and Latin America 53.8 7.3 30.5 — 91.6 Asia and Other 17.2 0.2 0.2 0.3 17.9 Total written premiums by underwriting location for the three months ended September 30, 2018 $ 144.9 $ 87.9 $ 72.6 $ 0.3 $ 305.7 The following tables provide summary information regarding net premiums written by client location and underwriting location by reportable segment for the nine months ended September 30, 2019 and 2018 : For the nine months ended September 30, 2019 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Total Net written premiums by client location: United States $ 209.2 $ 301.2 $ 214.9 $ 1.0 $ 726.3 Europe 154.3 18.9 53.4 0.1 226.7 Canada, the Caribbean, Bermuda and Latin America 58.8 10.7 11.4 0.1 81.0 Asia and Other 114.3 29.3 30.9 0.3 174.8 Total net written premium by client location for the nine months ended September 30, 2019 $ 536.6 $ 360.1 $ 310.6 $ 1.5 $ 1,208.8 Net written premiums by underwriting location: United States $ 20.0 $ 136.0 $ 37.8 $ 1.0 $ 194.8 Europe 269.7 190.1 140.3 0.2 600.3 Canada, the Caribbean, Bermuda and Latin America 203.6 33.4 130.8 — 367.8 Asia and Other 43.3 0.6 1.7 0.3 45.9 Total written premiums by underwriting location for the nine months ended September 30, 2019 $ 536.6 $ 360.1 $ 310.6 $ 1.5 $ 1,208.8 For the nine months ended September 30, 2018 (Expressed in millions of U.S. dollars) Global Property Global A&H Specialty & Casualty Runoff & Other Total Net written premiums by client location: United States $ 241.0 $ 229.5 $ 119.6 $ 11.4 $ 601.5 Europe 148.4 25.1 76.0 0.1 249.6 Canada, the Caribbean, Bermuda and Latin America 69.7 8.6 7.4 — 85.7 Asia and Other 110.0 23.0 25.3 0.3 158.6 Total net written premium by client location for the nine months ended September 30, 2018 $ 569.1 $ 286.2 $ 228.3 $ 11.8 $ 1,095.4 Net written premiums by underwriting location: United States $ 28.8 $ 81.0 $ 9.3 $ 11.5 $ 130.6 Europe 271.5 164.5 132.8 — 568.8 Canada, the Caribbean, Bermuda and Latin America 224.0 40.1 84.3 — 348.4 Asia and Other 44.8 0.6 1.9 0.3 47.6 Total written premiums by underwriting location for the nine months ended September 30, 2018 $ 569.1 $ 286.2 $ 228.3 $ 11.8 $ 1,095.4

Reserves for unpaid losses an_2

Reserves for unpaid losses and loss adjustment expenses (Tables)	9 Months Ended
	Sep. 30, 2019
Insurance [Abstract]
Summary of the loss and LAE reserve activities	The following table summarizes the loss and LAE reserve activities of Sirius Group for the three months and nine months ended September 30, 2019 and 2018 : Three months ended September 30, Nine months ended September 30, (Millions) 2019 2018 2019 2018 Gross beginning balance $ 2,023.3 $ 1,827.1 $ 2,016.7 $ 1,898.5 Less beginning reinsurance recoverable on unpaid losses (357.4 ) (358.3 ) (350.2 ) (319.7 ) Net loss and LAE reserve balance 1,665.9 1,468.8 1,666.5 1,578.8 Losses and LAE incurred relating to: Current year losses 342.2 270.5 723.6 575.8 Prior years losses 6.4 (10.1 ) 86.9 (23.0 ) Total net incurred losses and LAE 348.6 260.4 810.5 552.8 Foreign currency translation adjustment to net loss and LAE reserves (15.3 ) (5.4 ) (15.3 ) (20.9 ) Acquisitions (See Note 3) — 0.2 — 0.2 Accretion of fair value adjustment to net loss and LAE reserves — 0.1 0.1 0.1 Loss and LAE paid relating to: Current year losses 97.7 80.5 254.8 152.5 Prior years losses 108.0 101.6 413.5 416.5 Total loss and LAE payments 205.7 182.1 668.3 569.0 Net ending balance 1,793.5 1,542.0 1,793.5 1,542.0 Plus ending reinsurance recoverable on unpaid losses 392.9 349.0 392.9 349.0 Gross ending balance $ 2,186.4 $ 1,891.0 $ 2,186.4 $ 1,891.0

Investment securities (Tables)

Investment securities (Tables)	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Schedule of net investment income	Net investment income for the three months and nine months ended September 30, 2019 and 2018 consisted of the following: For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Fixed maturity investments $ 12.8 $ 14.2 $ 40.0 $ 37.8 Short-term investments 4.1 2.4 12.0 3.7 Equity securities 2.7 5.9 12.5 14.2 Other long-term investments 5.2 2.7 12.3 5.2 Total investment income 24.8 25.2 76.8 60.9 Investment expenses (2.0 ) (3.4 ) (9.5 ) (9.1 ) Net investment income $ 22.8 $ 21.8 $ 67.3 $ 51.8
Schedule of net realized and unrealized investment gains (losses)	Net realized and unrealized investment gains (losses) for the three months and nine months ended September 30, 2019 and 2018 consisted of the following: For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Gross realized gains $ 22.1 $ 11.3 $ 63.1 $ 31.7 Gross realized (losses) (6.8 ) (7.4 ) (23.2 ) (23.7 ) Net realized gains on investments (1)(2) 15.3 3.9 39.9 8.0 Net unrealized gains (losses) on investments (3)(4) 53.9 (11.7 ) 143.4 29.0 Net realized and unrealized gains (losses) on investments $ 69.2 $ (7.8 ) $ 183.3 $ 37.0 (1) Includes $14.0 and $4.7 of realized gains due to foreign currency for the three months ended September 30, 2019 and 2018 , respectively. (2) Includes $34.5 and $10.7 of realized gains due to foreign currency for the nine months ended September 30, 2019 and 2018 , respectively. (3) Includes $33.9 and $(5.5) of unrealized (losses) gains due to foreign currency for the three months ended September 30, 2019 and 2018 , respectively. (4) Includes $ 51.7 and $ 43.1 of unrealized gains due to foreign currency for the nine months ended September 30, 2019 and 2018 , respectively.
Schedule of net realized investment gains (losses)	Net realized investment gains for the three months and nine months ended September 30, 2019 and 2018 consisted of the following: For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Fixed maturity investments $ 7.5 $ 4.2 $ 22.4 $ 5.0 Equity securities 1.7 (0.6 ) (0.1 ) (0.4 ) Short-term investments 6.5 — 9.7 — Derivative instruments (0.7 ) — (1.5 ) — Other long-term investments 0.3 0.3 9.4 3.4 Net realized investment gains $ 15.3 $ 3.9 $ 39.9 $ 8.0
Schedule of net unrealized investment gains (losses)	The following table summarizes the amount of total gains (losses) included in earnings attributable to unrealized investment gains (losses) for Level 3 investments for the three months and nine months ended September 30, 2019 and 2018 : For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Fixed maturity investments $ — $ 0.1 $ — $ (2.0 ) Other long-term investments (0.3 ) (1.6 ) 10.1 6.1 Total unrealized investment (losses) gains – Level 3 investments $ (0.3 ) $ (1.5 ) $ 10.1 $ 4.1 Net unrealized investment gains (losses) for the three months and nine months ended September 30, 2019 and 2018 consisted of the following: For the three months ended September 30, For the nine months ended September 30, (Millions) 2019 2018 2019 2018 Fixed maturity investments $ 31.4 $ (8.6 ) $ 72.1 $ 12.2 Equity securities 12.0 0.9 50.4 2.1 Short-term investments 4.6 — 6.4 — Derivative instruments 0.9 — 0.2 — Other long-term investments 5.0 (4.0 ) 14.3 14.7 Net unrealized investment gains (losses) $ 53.9 $ (11.7 ) $ 143.4 $ 29.0
Schedule of investment 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 Sirius Group's equity securities and other long-term investments as of September 30, 2019 and December 31, 2018 , were as follows: September 30, 2019 (Millions) Cost or amortized cost Gross unrealized gains Gross unrealized losses Net foreign currency gains Fair value Equity securities $ 359.4 $ 46.8 $ (35.2 ) $ 13.3 $ 384.3 Other long-term investments $ 332.6 $ 52.7 $ (29.7 ) $ 12.8 $ 368.4 December 31, 2018 (Millions) Cost or amortized cost Gross unrealized gains Gross unrealized losses Net foreign currency gains Fair value Equity securities $ 409.4 $ 17.8 $ (50.8 ) $ 3.6 $ 380.0 Other long-term investments $ 337.6 $ 32.6 $ (13.5 ) $ 8.3 $ 365.0 Equity securities at fair value consisted of the following as of September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Investment grade fixed income mutual funds $ 150.9 $ 157.7 Common stocks 231.8 222.3 Other 1.6 — Total Equity securities $ 384.3 $ 380.0 Other long-term investments at fair value consisted of the following as of September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Hedge funds and private equity funds $ 287.7 $ 301.4 Limited liability companies and private equity securities 80.7 63.6 Total other long-term investments $ 368.4 $ 365.0 The cost or amortized cost, gross unrealized investment gains (losses), net foreign currency gains (losses), and fair value of Sirius Group's fixed maturity investments as of September 30, 2019 and December 31, 2018 , were as follows: September 30, 2019 (Millions) Cost or amortized cost Gross unrealized gains Gross unrealized (losses) Net foreign currency gains (losses) Fair value Corporate debt securities $ 517.7 $ 6.3 $ (0.3 ) $ 24.0 $ 547.7 Asset-backed securities 501.4 1.1 (1.9 ) 6.6 507.2 Residential mortgage-backed securities 365.9 11.9 (0.8 ) 14.5 391.5 U.S. government and government agency 157.6 1.7 — 3.0 162.3 Commercial mortgage-backed securities 102.0 1.2 (0.4 ) 1.8 104.6 Non-U.S. government and government agency 37.8 0.3 (0.1 ) 0.4 38.4 Preferred stocks 18.0 0.1 (0.1 ) (0.1 ) 17.9 U.S. States, municipalities and political subdivision 1.7 — — 0.1 1.8 Total fixed maturity investments $ 1,702.1 $ 22.6 $ (3.6 ) $ 50.3 $ 1,771.4 December 31, 2018 (Millions) Cost or amortized cost Gross unrealized gains Gross unrealized (losses) Net foreign currency gains (losses) Fair value Corporate debt securities $ 694.1 $ 1.4 $ (7.3 ) $ 7.6 $ 695.8 Asset-backed securities 496.3 0.1 (3.8 ) 1.9 494.5 Residential mortgage-backed securities 413.0 1.7 (7.1 ) 5.9 413.5 U.S. government and government agency 163.9 0.3 (0.5 ) 4.2 167.9 Commercial mortgage-backed securities 117.7 0.2 (2.7 ) 0.7 115.9 Non-U.S. government and government agency 50.6 — (0.2 ) (0.1 ) 50.3 Preferred stocks 14.5 0.6 (6.8 ) 0.2 8.5 U.S. States, municipalities and political subdivision 2.8 — — — 2.8 Total fixed maturity investments $ 1,952.9 $ 4.3 $ (28.4 ) $ 20.4 $ 1,949.2
Schedule of fixed maturity investment by contractual maturity	The cost or amortized cost and fair value of Sirius Group's fixed maturity investments as of September 30, 2019 and December 31, 2018 are presented below 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. September 30, 2019 December 31, 2018 (Millions) Cost or amortized cost Fair value Cost or amortized cost Fair value Due in one year or less $ 155.5 $ 162.6 $ 249.6 $ 254.6 Due after one year through five years 487.3 513.6 635.6 636.4 Due after five years through ten years 40.8 41.7 26.2 25.7 Due after ten years 31.2 32.3 0.1 0.1 Mortgage-backed and asset-backed securities 969.3 1,003.3 1,026.9 1,023.9 Preferred stocks 18.0 17.9 14.5 8.5 Total $ 1,702.1 $ 1,771.4 $ 1,952.9 $ 1,949.2
Schedule of ratings and fair value of fixed maturity investments	The following table summarizes the ratings and fair value of fixed maturity investments held in Sirius Group's investment portfolio as of September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 AAA $ 573.5 $ 602.0 AA 740.8 818.0 A 257.9 290.5 BBB 120.4 167.4 Other 78.8 71.3 Total fixed maturity investments (1) $ 1,771.4 $ 1,949.2 (1)Credit ratings are assigned based on the following hierarchy: 1) Standard & Poor's ("S&P") and 2) Moody's Investors Service ("Moody's").
Summary of investment securities by investment objective and sector	The following table summarizes investments in hedge funds and private equity interests by investment objective and sector as of September 30, 2019 and December 31, 2018 : September 30, 2019 December 31, 2018 (Millions) Fair Value Unfunded Commitments Fair Value Unfunded Commitments Hedge funds: Long/short multi-sector $ 50.6 $ — $ 41.0 $ — Distressed mortgage credit 52.3 — 54.8 — Private Credit 21.2 — 20.0 — Other 1.5 — 2.5 — Total hedge funds 125.6 — 118.3 — Private equity funds: Energy infrastructure & services 64.2 41.4 93.7 54.2 Multi-sector 10.4 7.9 9.0 0.7 Healthcare 31.9 10.8 31.7 15.6 Life settlement 25.7 — 23.7 — Manufacturing/Industrial 27.8 3.8 23.6 10.4 Private equity secondaries 0.6 0.8 1.1 1.1 Real estate 0.3 — 0.3 — Other 1.2 2.5 — — Total private equity funds 162.1 67.2 183.1 82.0 Total hedge and private equity funds included in other long-term investments $ 287.7 $ 67.2 $ 301.4 $ 82.0
Schedule of redemption frequency and advance notice period requirements for investments	The following summarizes the September 30, 2019 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 30-59 days notice 60-89 days notice 90-119 days notice 120+ days notice Total Monthly $ — $ 35.7 $ — $ — $ 35.7 Quarterly 0.8 — — — 0.8 Semi-annual — 0.3 — — 0.3 Annual — 14.9 52.7 21.2 88.8 Total $ 0.8 $ 50.9 $ 52.7 $ 21.2 $ 125.6
Schedule of investment securities by lock-up period.	As of September 30, 2019 , investments in private equity funds were subject to lock-up periods as follows: (Millions) 1 - 3 years 3 – 5 years 5 – 10 years Total Private Equity Funds – expected lock up period remaining $ 10.3 $ 3.3 $ 148.5 $ 162.1

Fair value measurements (Tables

Fair value measurements (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Summary of financial assets and liabilities measured at fair value	The following tables summarize Sirius Group's financial assets and liabilities measured at fair value as of September 30, 2019 and December 31, 2018 by level: September 30, 2019 (Millions) Fair Value Level 1 Inputs Level 2 Inputs Level 3 Inputs Assets measured at fair value Fixed maturity investments: U.S. Government and government agency $ 162.3 $ 160.9 $ 1.4 $ — Corporate debt securities 547.7 — 547.7 — Residential mortgage-backed securities 391.5 — 391.5 — Asset-backed securities 507.2 — 507.2 — Commercial mortgage-backed securities 104.6 — 104.6 — Non-U.S. government and government agency 38.4 21.3 17.1 — Preferred stocks 17.9 — 0.9 17.0 U.S. States, municipalities, and political subdivision 1.8 — 1.8 — Total fixed maturity investments 1,771.4 182.2 1,572.2 17.0 Equity securities: Investment grade fixed income mutual funds 150.9 150.9 — — Common stocks 231.8 231.8 — — Other 1.6 — 1.6 — Total equity securities 384.3 382.7 1.6 — Short-term investments 989.3 978.8 10.5 — Other long-term investments (1) 80.7 — — 80.7 Total investments $ 3,225.7 $ 1,543.7 $ 1,584.3 $ 97.7 Derivative instruments 6.3 1.6 — 4.7 Total assets measured at fair value $ 3,232.0 $ 1,545.3 $ 1,584.3 $ 102.4 Liabilities measured at fair value Contingent consideration liabilities $ 26.0 $ — $ — $ 26.0 Derivative instruments 6.9 — — 6.9 Total liabilities measured at fair value $ 32.9 $ — $ — $ 32.9 (1) Excludes fair value of $287.7 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. December 31, 2018 (Millions) Fair value Level 1 inputs Level 2 inputs Level 3 inputs Assets measured at fair value Fixed maturity investments: U.S. Government and government agency $ 167.9 $ 164.7 $ 3.2 $ — Corporate debt securities 695.8 — 695.8 — Asset-backed securities 494.5 — 494.5 — Residential mortgage-backed securities 413.5 — 413.5 — Commercial mortgage-backed securities 115.9 — 115.9 — Non-U.S. government and government agency 50.3 42.9 7.4 — Preferred stocks 8.5 — 3.1 5.4 U.S. States, municipalities, and political subdivision 2.8 — 2.8 — Total fixed maturity investments 1,949.2 207.6 1,736.2 5.4 Short-term investments 715.5 679.3 36.2 — Equity securities: Investment grade fixed income mutual funds 157.7 157.7 — — Common stocks 222.3 222.3 — — Total equity securities 380.0 380.0 — — Other long-term investments (1) 63.6 — — 63.6 Total investments $ 3,108.3 $ 1,266.9 $ 1,772.4 $ 69.0 Derivative instruments 4.1 — — 4.1 Total assets measured at fair value $ 3,112.4 $ 1,266.9 $ 1,772.4 $ 73.1 Liabilities measured at fair value Contingent consideration liabilities $ 28.8 $ — $ — $ 28.8 Derivative instruments 5.1 0.5 — 4.6 Total liabilities measured at fair value $ 33.9 $ 0.5 $ — $ 33.4 (1) Excludes fair value of $301.4 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient.
Rollforward of Level 3 fair value measurements	The following tables present changes in Level 3 for financial instruments measured at fair value for the three months ended September 30, 2019 and September 30, 2018 : For the three months ended September 30, 2019 (Millions) Fixed Maturities Other long-term investments (1) Derivative instruments assets & (liabilities) Contingent consideration (liabilities) Balance at June 30, 2019 $ — $ 88.0 $ (3.6 ) $ (30.8 ) Total realized and unrealized gains (losses) — (0.3 ) (2.0 ) (2.1 ) Foreign currency gains (losses) through Other Comprehensive Income — (1.0 ) — — Purchases 17.0 — — — Sales/Settlements — (6.0 ) 3.4 6.9 Balance at September 30, 2019 $ 17.0 $ 80.7 $ (2.2 ) $ (26.0 ) (1) Excludes fair value of $287.7 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. For the three months ended September 30, 2018 (Millions) Fixed Maturities Other long-term investments (1) Derivative instruments assets & (liabilities) Contingent consideration (liabilities) Balance at June 30, 2018 $ 6.0 $ 69.0 $ (5.8 ) $ (42.8 ) Total realized and unrealized gains (losses) 0.1 (1.6 ) 1.7 — Foreign currency gains (losses) through Other Comprehensive Income — 0.1 — — Purchases 2.4 0.2 — — Sales/Settlements — (0.2 ) (0.7 ) 0.9 Balance at September 30, 2018 $ 8.5 $ 67.5 $ (4.8 ) $ (41.9 ) (1) Excludes fair value of $281.5 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. The following tables present changes in Level 3 for financial instruments measured at fair value for the nine months ended September 30, 2019 and September 30, 2018 : For the nine months ended September 30, 2019 (Millions) Fixed Maturities Other long-term investments (1) Derivative instruments assets & (liabilities) Contingent consideration (liabilities) Balance at December 31, 2018 $ 5.4 $ 63.6 $ (0.5 ) $ (28.8 ) Total realized and unrealized gains (losses) — 10.6 (7.7 ) (4.1 ) Foreign currency gains (losses) through Other Comprehensive Income — (1.5 ) — — Purchases 17.0 15.8 — — Sales/Settlements (5.4 ) (7.8 ) 6.0 6.9 Balance at September 30, 2019 $ 17.0 $ 80.7 $ (2.2 ) $ (26.0 ) (1) Excludes fair value of $287.7 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient. For the nine months ended September 30, 2018 (Millions) Fixed Maturities Other long-term investments (1) Derivative instruments assets & (liabilities) Contingent consideration (liabilities) Balance at December 31, 2017 $ 8.0 $ 64.2 $ (6.1 ) $ (42.8 ) Total realized and unrealized gains (losses) (2.0 ) 7.7 7.3 — Foreign currency gains (losses) through Other Comprehensive Income — (1.5 ) — — Purchases 3.0 1.2 — — Sales/Settlements (0.5 ) (4.1 ) (6.0 ) 0.9 Balance at September 30, 2018 $ 8.5 $ 67.5 $ (4.8 ) $ (41.9 ) (1) Excludes fair value of $281.5 associated with hedge funds and private equity funds which fair value is measured using NAV practical expedient.
Schedule of significant unobservable inputs used for recurring fair value measurements for Level 3 instruments	The table below presents information about the significant unobservable inputs used for recurring fair value measurements for certain Level 3 instruments as of September 30, 2019 and December 31, 2018 , and includes only those instruments for which information about the inputs is reasonably available to Sirius Group, such as data from independent third-party valuation service providers and from internal valuation models. (Millions, except share prices) September 30, 2019 Description Valuation Technique(s) Fair value Unobservable input Private equity securities (1) Share price of recent transaction $ 32.5 Purchase share price $ 40.63 Preferred stock (1) Share price of recent transaction $ 17.5 Purchase price $ 7.74 Preferred stock (1) Purchase price of recent transaction $ 12.2 Purchase price $ 12.2 Private equity securities (1) Multiple of GAAP book value $ 16.6 Book value multiple 1.0X Private debt instrument (1) Purchase price of recent transaction $ 7.8 Purchase price $ 9.0 Private equity securities (1) Share price of recent transaction $ 5.1 Purchase price $ 7.74 Preferred stock (1) Purchase price of recent transaction $ 4.8 Purchase price $ 4.8 Weather derivatives (2) Third party appraisal $ 4.0 Broker quote $ 4.0 Private equity securities (1) Purchase price of recent transaction $ 1.0 Purchase price $ 10.0 Equity warrants Option pricing model $ 0.7 Strike price $ 0.2 Private equity securities (1) Purchase price of recent transaction $ 0.2 Purchase price $ 0.2 Currency swaps (1) Third party appraisal $ (1.2 ) Broker quote $ (1.2 ) Currency forwards (1) Third party appraisal $ (5.7 ) Broker quote $ (5.7 ) Contingent consideration External valuation model $ (26.0 ) Discounted future payments $ (26.0 ) (1) As of September 30, 2019 , each asset type consists of one security. (2) See Note 11 for discussion of derivative instruments. (Millions, except share prices) December 31, 2018 Description Valuation Technique(s) Fair value Unobservable input Private equity securities (1) Share price of recent transaction $ 32.5 Purchase share price $ 40.63 Private equity securities (1) Multiple of GAAP book value $ 14.7 Book value multiple 0.9X Private debt instrument (1) Purchase price of recent transaction $ 9.0 Purchase price $ 9.0 Private debt instrument (1) Purchase price of recent transaction $ 6.0 Purchase price $ 6.0 Preferred stock (1) Share price of recent transaction $ 4.6 Purchase price $ 1.88 Weather derivatives (2) Third party appraisal $ 3.9 Broker quote $ 3.9 Private equity securities( 1) Purchase price of recent transaction $ 0.9 Purchase price $ 1.88 Preferred stock (1) Share price of recent transaction $ 0.8 Purchase price $ 0.8 Private equity securities (1) Share price of recent transaction $ 0.3 Purchase price $ 10.0 Private debt instrument (1) Purchase price of recent transaction $ 0.2 Purchase price $ 0.2 Interest rate cap (2) Third party appraisal $ 0.2 Broker quote $ 0.2 Currency swaps (2) Third party appraisal $ (4.6 ) Broker quote $ (4.6 ) Contingent consideration External valuation model $ (28.8 ) Discounted future payments $ (28.8 ) (1) As of December 31, 2018 , each asset type consists of one security. (2) See Note 11 for discussion of derivative instruments.
Schedule of financial instruments disclosed, but not carried at fair value	The following table includes financial instruments for which the carrying value differs from the estimated fair values at September 30, 2019 and December 31, 2018 : September 30, 2019 December 31, 2018 (Millions) Fair Value (1) Carrying Value Fair Value (1) Carrying Value Liabilities, Mezzanine equity, and Non-controlling interest: 2017 SEK Subordinated Notes $ 279.8 $ 276.5 $ 309.5 $ 303.6 2016 SIG Senior Notes $ 397.3 $ 393.8 $ 347.6 $ 393.2 Series B preference shares $ 195.0 $ 236.0 $ 191.7 $ 232.2 (1) Fair value estimated by internal pricing and considered a Level 3 measurement.

Debt and standby letters of c_2

Debt and standby letters of credit facilities (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of debt outstanding	Sirius Group's debt outstanding as of September 30, 2019 and December 31, 2018 consisted of the following: (Millions) September 30, 2019 Effective Rate (1) December 31, 2018 Effective Rate (1) 2017 SEK Subordinated Notes, at face value $ 280.2 4.0 % $ 307.6 3.8 % Unamortized issuance costs (3.7 ) (4.0 ) 2017 SEK Subordinated Notes, carrying value 276.5 303.6 2016 SIG Senior Notes, at face value 400.0 4.7 % 400.0 4.7 % Unamortized discount (2.4 ) (2.6 ) Unamortized issuance costs (3.8 ) (4.2 ) 2016 SIG Senior Notes, carrying value 393.8 393.2 Total debt $ 670.3 $ 696.8 (1) Effective rate considers the effect of the debt issuance costs.

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of classification and amount of fair value of derivatives not designated as hedging instruments within Consolidated Balance Sheets	The following tables summarize 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 at September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Derivatives not designated as hedging instruments Notional Value Asset derivative at fair value (1) Liability derivative at fair value (2) Notional Value Asset derivative at fair value (1) Liability derivative at fair value (2) Interest rate cap $ 250.0 $ — $ — $ 250.0 $ 0.2 $ — Foreign currency swaps $ 90.0 $ — $ 1.2 $ 45.0 $ — $ 4.6 Foreign currency forwards $ (5.0 ) $ — $ 5.7 $ — $ — $ — Weather derivatives $ 95.5 $ 4.0 $ — $ 150.5 $ 3.9 $ — Equity futures contracts $ 1.8 $ — $ — $ — $ — $ — Equity put options $ 23.4 $ 1.9 $ 0.3 $ 6.2 $ — $ 0.5 Equity warrants $ 0.7 $ 0.7 $ — $ — $ — $ — (1) Asset derivatives are classified within Other assets within the Company's Consolidated Balance Sheets at September 30, 2019 and December 31, 2018 . (2) Liability derivatives are classified within Other liabilities within the Company's Consolidated Balance Sheets at September 30, 2019 and December 31, 2018 .
Schedule of classification and net impact on earnings, recognized in Consolidated Statements of Income 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 relating to derivatives during the three months and nine months ended September 30, 2019 and 2018 : (Millions) For the three months ended September 30, For the nine months ended September 30, Derivatives not designated as hedging instruments Classification of gains (losses) recognized in earnings 2019 2018 2019 2018 Interest rate cap Other revenues $ — $ — $ (0.2 ) $ 0.2 Foreign currency swaps Net foreign exchange gains $ 3.7 $ (0.1 ) $ 6.1 $ 2.9 Foreign currency forwards Net foreign exchange gains (losses) $ (7.8 ) $ — $ (10.8 ) $ — Weather derivatives Other revenues $ 1.9 $ 1.8 $ (3.6 ) $ 4.2 Equity futures contracts Net realized investment gains (losses) $ 0.1 $ — $ (0.7 ) $ — Equity futures contracts Net unrealized investment gains $ (0.5 ) $ — $ (0.6 ) $ — Equity put options Net realized investment gains (losses) $ (0.8 ) $ — $ (0.8 ) $ — Equity put options Net unrealized investment gains $ 0.7 $ — $ 0.2 $ — Equity warrants Net unrealized investment gains $ 0.3 $ — $ 0.7 $ —

Common shareholder's equity, _2

Common shareholder's equity, mezzanine equity, and non-controlling interests (Tables)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Schedule of changes in the company's issued and outstanding common shares	The following table presents changes in the Company's issued and outstanding Common shares as of September 30, 2019 and 2018 , respectively: Three months ended September 30, Nine months ended September 30, (Millions) 2019 2018 2019 2018 Common shares: Shares issued and outstanding, beginning of period 115,296,918 120,000,000 115,151,251 120,000,000 Issuance of shares to directors and employees 2,424 — 148,091 — Shares issued and outstanding, end of period 115,299,342 120,000,000 115,299,342 120,000,000
Schedule of change in non-controlling interest	The following tables show the change in non-controlling interest for the three months and nine months ended September 30, 2019 and 2018 : (Millions) For the three months ended September 30, 2019 For the three months ended September 30, 2018 Non-controlling interests, beginning of the period $ 3.0 $ 1.0 Net income attributable to non-controlling interests 0.4 0.3 Other, net — (0.2 ) Non-controlling interests, end of the period $ 3.4 $ 1.1 (Millions) For the nine months ended September 30, 2019 For the nine months ended September 30, 2018 Non-controlling interests, beginning of the period $ 1.7 $ 0.2 Net income attributable to non-controlling interests 1.6 0.9 Other, net 0.1 — Non-controlling interests, end of the period $ 3.4 $ 1.1

Earnings per share (Tables)

Earnings per share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of computation of basic and diluted earnings per common share	The following table sets forth the computation of basic and diluted earnings per common share for the three months and nine months ended September 30, 2019 and 2018 : For the three months ended September 30, For the nine months ended September 30, (Millions, except share and per share information) 2019 2018 2019 2018 Basic earnings per share Numerator: Net income $ (7.6 ) $ (27.7 ) $ 104.7 $ 113.8 Less: Income attributable to non-controlling interests (0.4 ) (0.3 ) (1.6 ) (0.9 ) Less: Change in carrying value of Series B preference shares 5.3 — (3.9 ) — Less: Accrued dividends on Series A redeemable preference shares — — — (2.6 ) Net income available for dividends out of undistributed earnings $ (2.7 ) $ (28.0 ) $ 99.2 $ 110.3 Less: Earnings attributable to Series B preference shares — — (9.3 ) — Less: Earnings attributable to Series A redeemable preference shares — — — (4.5 ) Net income available to Sirius Group common shareholders $ (2.7 ) $ (28.0 ) $ 89.9 $ 105.8 Denominator: Weighted average shares outstanding for basic earnings per share 115,251,853 120,000,000 115,225,942 120,000,000 Basic earnings per share $ (0.02 ) $ (0.23 ) $ 0.78 $ 0.88 Diluted earnings per share Numerator: Net income available to Sirius Group common shareholders $ (2.7 ) $ (28.0 ) $ 89.9 $ 105.8 Add: Change in carrying value of Series B preference shares (5.3 ) — — — Net income available to Sirius Group common shareholders on a diluted basis $ (8.0 ) $ (28.0 ) $ 89.9 $ 105.8 Denominator: Weighted average shares outstanding for basic earnings per share 115,251,853 120,000,000 115,225,942 120,000,000 Add: Series B preference shares 11,901,670 — — — Add: Unvested performance share units and restricted share units — — 393,280 — Weighted average shares outstanding for diluted earnings per share (1) 127,153,523 120,000,000 115,619,222 120,000,000 Diluted earnings per share $ (0.06 ) $ (0.23 ) $ 0.78 $ 0.88 (1)For the three months ended September 30, 2019 , there were a total of 19,537,270 potentially dilutive securities excluded from the calculation of Diluted earnings per share. For the nine months ended September 30, 2019 , there were a total of 31,045,660 potentially dilutive securities excluded from the calculation of Diluted earnings per share. As at September 30, 2018 , there were no potentially dilutive securities excluded from the calculation of Diluted earnings per share.

Investments in unconsolidated_2

Investments in unconsolidated entities (Tables)	9 Months Ended
	Sep. 30, 2019
Investments in unconsolidated entities
Schedule of components of Other long-term investments	The following table presents the components of Other long-term investments as of September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Equity method eligible unconsolidated entities, at fair value $ 143.5 $ 169.4 Other unconsolidated investments, at fair value (1) 224.9 195.6 Total Other long-term investments (2) $ 368.4 $ 365.0 (1)Includes Other long-term investments that are not equity method eligible. (2)There were no investments accounted for using the equity method as of September 30, 2019 and December 31, 2018
Schedule of investments in equity method eligible unconsolidated entities	The following table presents Sirius Group's investments in equity method eligible unconsolidated entities as of September 30, 2019 and December 31, 2018 with ownership interest greater than 20% : Ownership interest at Investee September 30, 2019 December 31, 2018 Instrument Held BE Reinsurance Limited 25.0 % 25.0 % Common shares BioVentures Investors (Offshore) IV LP 73.0 % 73.0 % Units Camden Partners Strategic Fund V (Cayman), LP 36.3 % 36.4 % Units NEC Cypress Buyer LLC (1) 13.3 % 13.3 % Units New Energy Capital Infrastructure Credit Fund LP 23.3 % 22.9 % Units New Energy Capital Infrastructure Offshore Credit Fund LP 56.2 % 54.9 % Units Scion G7, LP 28.8 % 28.8 % Units Tuckerman Capital V LP 48.2 % 47.6 % Units Tuckerman Capital V Co-Investment I LP 47.7 % 47.7 % Units (1)The ownership percentage of NEC Cypress Buyer LLC is less than 20% at September 30, 2019 and December 31, 2018, but is included in the table as it is a subsidiary investment within the New Energy Capital Credit Funds, which are equity method eligible.

Variable interest entities (Tab

Variable interest entities (Tables)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of assets and liabilities related to the consolidated VIEs	The following table presents Alstead Re's assets and liabilities, as classified in the Consolidated Balance Sheets as at September 30, 2019 and December 31, 2018 : (Millions) September 30, 2019 December 31, 2018 Assets: Fixed maturity investments, trading at fair value $ 3.9 $ 4.0 Short-term investments, at fair value 0.5 0.3 Cash 0.1 0.2 Total investments 4.5 4.5 Insurance and reinsurance premiums receivable (0.3 ) 0.1 Funds held by ceding companies 4.6 3.7 Deferred acquisition costs 0.3 5.2 Other assets 0.1 0.9 Total assets $ 9.2 $ 14.4 Liabilities Loss and loss adjustment expense reserves $ 0.8 $ 4.6 Unearned insurance and reinsurance premiums 0.6 3.7 Other liabilities 0.1 — Total liabilities $ 1.5 $ 8.3
Schedule of total assets of unconsolidated VIEs	The following table presents total assets of unconsolidated VIEs in which Sirius Group holds a variable interest, as well as the maximum exposure to loss associated with these VIEs: Maximum Exposure to Loss (Millions) Total VIE Assets On-Balance Sheet Off-Balance Sheet Total September 30, 2019 Other long-term investments (1) $ 278.8 $ 114.2 $ 17.9 $ 132.1 Total at September 30, 2019 $ 278.8 $ 114.2 $ 17.9 $ 132.1 December 31, 2018 Other long-term investments (1) $ 209.1 $ 103.1 $ 32.0 $ 135.1 Total at December 31, 2018 $ 209.1 $ 103.1 $ 32.0 $ 135.1 (1)Comprised primarily of hedge funds and private equity funds.

Commitments and contingencies (

Commitments and contingencies (Tables)	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of lease balances within the Consolidated Balance Sheets	The following table presents the lease balances within the Consolidated Balance Sheets as at September 30, 2019 : (millions) Balance Sheet Classification September 30, 2019 Operating lease right-of-use assets Other assets $28.8 Current lease liabilities Other liabilities $8.5 Non-current lease liabilities Other liabilities $22.2
Schedule of weighted average remaining lease term and weighted average discount rate	The following table presents weighted average remaining lease term and weighted average discount rate as at September 30, 2019 : Weighted average lease term (years) as at September 30, 2019 Leased offices 7 years Leased equipment 3 years Weighted average discount rate: Leased offices 3.7 % Leased equipment 3.4 %
Schedule of future annual minimum rental payments required under non cancellable leases for office space	The following table presents future annual minimum rental payments required under non-cancellable leases and the present value discount to arrive at total lease liability as at September 30, 2019 : (Millions) Future Payments 2019 $ 2.5 2020 9.0 2021 7.8 2022 6.9 2023 4.3 2024 and after 2.8 Total future annual minimum rental payments as at September 30, 2019 33.3 Less: present value discount (2.6 ) Total lease liability as at September 30, 2019 $ 30.7

Summary of significant accoun_3

Summary of significant accounting policies - Recent adopted changes in accounting principle and Recent accounting pronouncements (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019
Summary of significant accounting policies
Lease liability	$ 30.7
Operating lease right-of-use assets	$ 28.8
ASU 2016-02
Summary of significant accounting policies
Lease liability		$ 36.8
Operating lease right-of-use assets		$ 34.4

Significant transactions - East

Significant transactions - Easterly Acquisition Corp. and WRM America Indemnity Company, Inc. (Details) $ / shares in Units, $ in Millions	Nov. 16, 2018USD ($)	Nov. 05, 2018USD ($)$ / sharesshares	Nov. 02, 2018USD ($)$ / sharesshares	Aug. 16, 2018USD ($)	Sep. 30, 2019shares	Sep. 30, 2018$ / sharesshares	Sep. 30, 2019shares	Sep. 30, 2018$ / sharesshares
Significant transactions
Shares issued (in shares) | shares					2,424	0	148,091	0
Proceeds from merger, private placement and employee stock purchase plan		$ 268
CM Bermuda
Significant transactions
Adjustment to consideration payable	$ 1.6
Reported book value per share (in usd per share) | $ / shares						$ 16.44		$ 16.44
Merger related contractual costs	9
Acquisition related costs	$ 7.1
ESPP
Significant transactions
Payroll deduction period		2 years
Number of employees that purchased shares ( in employees) | $ / shares		405
Number of common shares purchased (in shares) | shares		149,236
Share-based compensation expense		$ 2.6
ESPP | Sirius Group Private Placement
Significant transactions
Number of times of diluted book value per share, exchange price of share		1.05
Preference Share Investors | Sirius Group Private Placement | Series B preference shares
Significant transactions
Share subscriptions (in shares) | shares		11,901,670
Merger Agreement | Sirius Group Private Placement
Significant transactions
Adjusted diluted book value per share (in usd per share) | $ / shares		17.22447
Merger Agreement | ESPP
Significant transactions
Minimum number of shares to be purchased (in shares) | shares		100
Maximum number of shares to be purchased (in shares) | shares		1,000
Subscription Agreement | Preference Share Investors | Sirius Group Private Placement
Significant transactions
Warrants received (in shares) | shares		5,418,434
Exercisable period of warrants (in years)		5 years
Strike price as a percentage of the per share purchase price		125.00%
Warrant strike price per share (in usd per share) | $ / shares		$ 21.53
Cost value of warrants		$ 9.6
Stock issuance costs		2
Subscription Agreement | Preference Share Investors | Sirius Group Private Placement | Series B preference shares
Significant transactions
Gross proceeds		226.1
Value of share subscriptions		$ 195.8
Subscription Agreement | Preference Share Investors | Sirius Group Private Placement | Series B preference shares | Common shares
Significant transactions
Share subscriptions (in shares) | shares		1,225,954
Value of share subscriptions		$ 20.8
Redemption Agreement | CM Bermuda
Significant transactions
Stock redeemed (in shares) | shares			9,519,280
Redemption Agreement | CM Bermuda | Common shares
Significant transactions
Value of shares redeemed			$ 164
Share price (in usd per share) | $ / shares			$ 17.22447
Redemption Agreement | IMGAH
Significant transactions
Redemption amount of preference shares		95
Easterly | Merger Agreement
Significant transactions
Public shares held by Easterly's public stockholders in trust		$ 39.3	$ 149
Issuance of converted warrants (in shares) | shares		6,088,535
Easterly | Merger Agreement | Common shares
Significant transactions
Number of times of diluted book value per share, exchange price of share		1.05
Exchange ratio		0.609
Value of shares redeemed			$ 109.7
Shares issued (in shares) | shares		2,280,241
WRM America Indemnity Company, Inc.
Significant transactions
Purchase consideration				$ 16.9
Acquisition of intangible assets				$ 3.1
WRM America Indemnity Company, Inc. | ESPP
Significant transactions
Percentage of ownership interest acquired				100.00%
Market value for the first 100 shares | ESPP
Significant transactions
Purchase price of common shares as a percentage of its market value		85.00%
Market value for the next 900 shares | ESPP
Significant transactions
Purchase price of common shares as a percentage of its market value		100.00%

Segment information - Segment r

Segment information - Segment results (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)productsegment	Sep. 30, 2018USD ($)
Segment information
Number of reportable segments | segment			4
Gross written premiums	$ 413.7	$ 398	$ 1,523.1	$ 1,518.2
Net written premiums	322.3	305.7	1,208.8	1,095.4
Net earned insurance and reinsurance premiums	374.2	321.1	1,056.8	914.5
Loss and allocated LAE	(334.4)	(248.4)	(775.7)	(524.9)
Insurance and reinsurance acquisition expenses	(75.1)	(59.2)	(215.4)	(189)
Technical profit	(35.3)	13.5	65.7	200.6
Unallocated LAE	(14.2)	(12)	(34.8)	(27.9)
Other underwriting expenses	(35.4)	(35.7)	(106.2)	(117.1)
Underwriting income (loss)	(84.9)	(34.2)	(75.3)	55.6
Service fee revenue	16.4	15.4	58.3	55.5
General and administrative expenses, MGU plus Runoff & Other	(28)	(19.5)	(80.6)	(58)
Underwriting income (loss), including net service fee income	(84.8)	(33.4)	(66.3)	70.7
Net investment income	22.8	21.8	67.3	51.8
Net realized investment (losses) gains	15.3	3.9	39.9	8
Net unrealized investment (losses) gains	53.9	(11.7)	143.4	29
Net foreign exchange gains (losses)	4.9	(0.4)	9.4	21.7
Other revenue	(0.1)	1.6	(7)	40.5
General and administrative expenses	(11.7)	(4.9)	(31.3)	(17.6)
Intangible asset amortization expenses	(3.9)	(3.9)	(11.8)	(11.8)
Interest expense on debt	(7.7)	(7.6)	(23.3)	(23.1)
Pre-tax (loss) income	$ (11.3)	$ (34.6)	$ 120.3	$ 169.2
Underwriting Ratios
Loss ratio	93.20%	81.10%	76.70%	60.40%
Acquisition expense ratio	20.10%	18.40%	20.40%	20.70%
Other underwriting expense ratio	9.50%	11.10%	10.00%	12.80%
Combined ratio	122.80%	110.60%	107.10%	93.90%
Goodwill and intangible assets	$ 584.2	$ 608.2	$ 584.2	$ 608.2
Managing general underwriters
Segment information
General and administrative expenses, MGU plus Runoff & Other	(16.3)	(14.6)	(49.3)	(40.4)
Corporate Elimination
Segment information
Insurance and reinsurance acquisition expenses	13.8	13.9	36.7	34
Technical profit	13.8	13.9	36.7	34
Unallocated LAE	(3.5)	(4.7)	(11.1)	(9.8)
Other underwriting expenses	(3.7)	(2)	(11.2)	(13.9)
Underwriting income (loss)	6.6	7.2	14.4	10.3
Service fee revenue	(14.6)	(13.9)	(39.3)	(34)
Corporate Elimination | Managing general underwriters
Segment information
Unallocated LAE	4.3	4.7	13.7	9.8
Other underwriting expenses	3.7	2	11.2	13.9
Global Property | Reportable segments
Segment information
Gross written premiums	153.6	203.7	720.5	875.7
Net written premiums	103.7	144.9	536.6	569.1
Net earned insurance and reinsurance premiums	159.9	172.7	463.9	476.3
Loss and allocated LAE	(184.4)	(173.2)	(378.3)	(311.8)
Insurance and reinsurance acquisition expenses	(29.2)	(30.1)	(82.2)	(93.5)
Technical profit	(53.7)	(30.6)	3.4	71
Unallocated LAE	(5.5)	(3.3)	(10.2)	(7.7)
Other underwriting expenses	(14.7)	(17.5)	(47.9)	(53)
Underwriting income (loss)	(73.9)	(51.4)	(54.7)	10.3
Underwriting income (loss), including net service fee income	$ (73.9)	$ (51.4)	$ (54.7)	$ 10.3
Underwriting Ratios
Loss ratio	118.80%	102.20%	83.70%	67.10%
Acquisition expense ratio	18.30%	17.40%	17.70%	19.60%
Other underwriting expense ratio	9.20%	10.10%	10.30%	11.10%
Combined ratio	146.30%	129.70%	111.70%	97.80%
Global A&H | Reportable segments
Segment information
Gross written premiums	$ 137.4	$ 117.1	$ 459.5	$ 375
Net written premiums	104.6	87.9	360.1	286.2
Net earned insurance and reinsurance premiums	115.1	89.6	330	258.4
Loss and allocated LAE	(63.6)	(51.3)	(198.6)	(138)
Insurance and reinsurance acquisition expenses	(32.5)	(26.7)	(95.1)	(82.3)
Technical profit	19	11.6	36.3	38.1
Unallocated LAE	(2)	(1.7)	(5.5)	(4.3)
Other underwriting expenses	(6.8)	(6.4)	(18.8)	(20.7)
Underwriting income (loss)	10.2	3.5	12	13.1
Service fee revenue	31	29.3	97.6	89.5
Underwriting income (loss), including net service fee income	$ 18.1	$ 12.3	$ 38.4	$ 41.4
Underwriting Ratios
Loss ratio	57.00%	59.20%	61.80%	55.10%
Acquisition expense ratio	28.20%	29.80%	28.80%	31.80%
Other underwriting expense ratio	5.90%	7.10%	5.70%	8.00%
Combined ratio	91.10%	96.10%	96.30%	94.90%
Goodwill and intangible assets	$ 576.1	$ 600.1	$ 576.1	$ 600.1
Global A&H | Reportable segments | Managing general underwriters
Segment information
Unallocated LAE	(4.3)	(4.7)	(13.7)	(9.8)
Other underwriting expenses	(3.7)	(2)	(11.2)	(13.9)
General and administrative expenses, MGU plus Runoff & Other	(15.1)	(13.8)	$ (46.3)	(37.5)
Specialty & Casualty | Reportable segments
Segment information
Number of core products | product			4
Gross written premiums	120.6	76.5	$ 338.4	252.9
Net written premiums	113.2	72.6	310.6	228.3
Net earned insurance and reinsurance premiums	98.7	58.4	261.7	168.3
Loss and allocated LAE	(85.5)	(34.1)	(194.4)	(87.4)
Insurance and reinsurance acquisition expenses	(27.1)	(16.2)	(72.2)	(44.9)
Technical profit	(13.9)	8.1	(4.9)	36
Unallocated LAE	(3)	(1.6)	(7.1)	(4.5)
Other underwriting expenses	(8.8)	(8.4)	(23.7)	(24.3)
Underwriting income (loss)	(25.7)	(1.9)	(35.7)	7.2
Underwriting income (loss), including net service fee income	$ (25.7)	$ (1.9)	$ (35.7)	$ 7.2
Underwriting Ratios
Loss ratio	89.70%	61.10%	77.00%	54.60%
Acquisition expense ratio	27.50%	27.70%	27.60%	26.70%
Other underwriting expense ratio	8.90%	14.40%	9.10%	14.40%
Combined ratio	126.10%	103.20%	113.70%	95.70%
Specialty & Casualty | Reportable segments | Minimum
Segment information
Pre-agreed domestic and export sales of goods and services coverage period			60 days
Specialty & Casualty | Reportable segments | Maximum
Segment information
Pre-agreed domestic and export sales of goods and services coverage period			120 days
Runoff & Other | Reportable segments
Segment information
Gross written premiums	$ 2.1	$ 0.7	$ 4.7	$ 14.6
Net written premiums	0.8	0.3	1.5	11.8
Net earned insurance and reinsurance premiums	0.5	0.4	1.2	11.5
Loss and allocated LAE	(0.9)	10.2	(4.4)	12.3
Insurance and reinsurance acquisition expenses	(0.1)	(0.1)	(2.6)	(2.3)
Technical profit	(0.5)	10.5	(5.8)	21.5
Unallocated LAE	(0.2)	(0.7)	(0.9)	(1.6)
Other underwriting expenses	(1.4)	(1.4)	(4.6)	(5.2)
Underwriting income (loss)	(2.1)	8.4	(11.3)	14.7
Underwriting income (loss), including net service fee income	(3.3)	7.6	(14.3)	11.8
Underwriting Ratios
Goodwill and intangible assets	8.1	8.1	8.1	8.1
Runoff & Other | Reportable segments | Managing general underwriters
Segment information
General and administrative expenses, MGU plus Runoff & Other	$ (1.2)	$ (0.8)	$ (3)	$ (2.9)

Segment information - Net premi

Segment information - Net premiums written by client location and underwriting location by reportable segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	$ 322.3	$ 305.7	$ 1,208.8	$ 1,095.4
Client location: United States
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	215.4	179	726.3	601.5
Client location: Europe
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	35.4	46.1	226.7	249.6
Client location: Canada, the Caribbean, Bermuda and Latin America
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	28.3	30.1	81	85.7
Client location: Asia and Other
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	43.2	50.5	174.8	158.6
Underwriting location: United States
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	57.8	46.1	194.8	130.6
Underwriting location: Europe
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	164.3	150.1	600.3	568.8
Underwriting location: Canada, the Caribbean, Bermuda and Latin America
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	90.7	91.6	367.8	348.4
Underwriting location: Asia and Other
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	9.5	17.9	45.9	47.6
Global Property | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	103.7	144.9	536.6	569.1
Global Property | Client location: United States | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	44	62.4	209.2	241
Global Property | Client location: Europe | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	14.6	22.8	154.3	148.4
Global Property | Client location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	19.7	24.7	58.8	69.7
Global Property | Client location: Asia and Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	25.4	35	114.3	110
Global Property | Underwriting location: United States | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	7.5	12.6	20	28.8
Global Property | Underwriting location: Europe | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	45	61.3	269.7	271.5
Global Property | Underwriting location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	42.3	53.8	203.6	224
Global Property | Underwriting location: Asia and Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	8.9	17.2	43.3	44.8
Global A&H | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	104.6	87.9	360.1	286.2
Global A&H | Client location: United States | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	87.6	71.4	301.2	229.5
Global A&H | Client location: Europe | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	5.8	7.4	18.9	25.1
Global A&H | Client location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	3.7	2.6	10.7	8.6
Global A&H | Client location: Asia and Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	7.5	6.5	29.3	23
Global A&H | Underwriting location: United States | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	36.9	27.7	136	81
Global A&H | Underwriting location: Europe | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	68.1	52.7	190.1	164.5
Global A&H | Underwriting location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	(0.6)	7.3	33.4	40.1
Global A&H | Underwriting location: Asia and Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0.2	0.2	0.6	0.6
Specialty & Casualty | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	113.2	72.6	310.6	228.3
Specialty & Casualty | Client location: United States | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	83.1	45.3	214.9	119.6
Specialty & Casualty | Client location: Europe | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	15.1	15.8	53.4	76
Specialty & Casualty | Client location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	4.8	2.8	11.4	7.4
Specialty & Casualty | Client location: Asia and Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	10.2	8.7	30.9	25.3
Specialty & Casualty | Underwriting location: United States | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	12.7	5.8	37.8	9.3
Specialty & Casualty | Underwriting location: Europe | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	51.2	36.1	140.3	132.8
Specialty & Casualty | Underwriting location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	49	30.5	130.8	84.3
Specialty & Casualty | Underwriting location: Asia and Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0.3	0.2	1.7	1.9
Runoff & Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0.8	0.3	1.5	11.8
Runoff & Other | Client location: United States | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0.7	(0.1)	1	11.4
Runoff & Other | Client location: Europe | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	(0.1)	0.1	0.1	0.1
Runoff & Other | Client location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0.1	0	0.1	0
Runoff & Other | Client location: Asia and Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0.1	0.3	0.3	0.3
Runoff & Other | Underwriting location: United States | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0.7	0	1	11.5
Runoff & Other | Underwriting location: Europe | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0	0	0.2	0
Runoff & Other | Underwriting location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	0	0	0	0
Runoff & Other | Underwriting location: Asia and Other | Reportable segments
Net premiums written by client location and underwriting location by reportable segment
Net written premiums	$ 0.1	$ 0.3	$ 0.3	$ 0.3

Reserves for unpaid losses an_3

Reserves for unpaid losses and loss adjustment expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Summary of the loss and LAE reserve activities
Gross beginning balance	$ 2,023.3	$ 1,827.1	$ 2,016.7	$ 1,898.5
Less beginning reinsurance recoverable on unpaid losses	(357.4)	(358.3)	(350.2)	(319.7)
Net loss and LAE reserve balance	1,665.9	1,468.8	1,666.5	1,578.8
Losses and LAE incurred relating to:
Current year losses	342.2	270.5	723.6	575.8
Prior years losses	6.4	(10.1)	86.9	(23)
Total net incurred losses and LAE	348.6	260.4	810.5	552.8
Foreign currency translation adjustment to net loss and LAE reserves	(15.3)	(5.4)	(15.3)	(20.9)
Acquisitions (See Note 3)	0	0.2	0	0.2
Accretion of fair value adjustment to net loss and LAE reserves	0	0.1	0.1	0.1
Loss and LAE paid relating to:
Current year losses	97.7	80.5	254.8	152.5
Prior years losses	108	101.6	413.5	416.5
Total loss and LAE payments	205.7	182.1	668.3	569
Net ending balance	1,793.5	1,542	1,793.5	1,542
Plus ending reinsurance recoverable on unpaid losses	392.9	349	392.9	349
Gross ending balance	$ 2,186.4	$ 1,891	$ 2,186.4	$ 1,891

Reserves for unpaid losses an_4

Reserves for unpaid losses and loss adjustment expenses - By segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reserves for unpaid losses and loss adjustment expenses
Prior years losses	$ 6.4	$ (10.1)	$ 86.9	$ (23)
Specialty & Casualty
Reserves for unpaid losses and loss adjustment expenses
Prior years losses	$ 10.2	(7.3)	14.8	(17.7)
Runoff & Other
Reserves for unpaid losses and loss adjustment expenses
Prior years losses		(10.6)	5.4	(22.6)
Global Property
Reserves for unpaid losses and loss adjustment expenses
Prior years losses		10.8	67.9	28.7
Global Property | Natural catastrophes
Reserves for unpaid losses and loss adjustment expenses
Prior years losses				7.4
Global A&H
Reserves for unpaid losses and loss adjustment expenses
Prior years losses		$ (3)	$ (1.3)	(11.4)
Aviation and Space | Specialty & Casualty
Reserves for unpaid losses and loss adjustment expenses
Prior years losses				$ (12)

Third party reinsurance (Detail

Third party reinsurance (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Insurance [Abstract]
Reinsurance recoverable on paid losses	$ 55.2	$ 55
Reinsurance recoverable on unpaid losses	$ 392.9	$ 350.2

Investment securities - Net inv

Investment securities - Net investment income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Investment Income
Total investment income	$ 24.8	$ 25.2	$ 76.8	$ 60.9
Investment expenses	(2)	(3.4)	(9.5)	(9.1)
Net investment income	22.8	21.8	67.3	51.8
Fixed maturity investments
Net Investment Income
Total investment income	12.8	14.2	40	37.8
Short-term investments
Net Investment Income
Total investment income	4.1	2.4	12	3.7
Equity securities
Net Investment Income
Total investment income	2.7	5.9	12.5	14.2
Other long-term investments
Net Investment Income
Total investment income	$ 5.2	$ 2.7	$ 12.3	$ 5.2

Investment securities - Net rea

Investment securities - Net realized and unrealized investment gains (losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net realized and unrealized investment gains (losses)
Gross realized gains	$ 22.1	$ 11.3	$ 63.1	$ 31.7
Gross realized (losses)	(6.8)	(7.4)	(23.2)	(23.7)
Net realized gains on investments	15.3	3.9	39.9	8
Net unrealized investment gains (losses)	53.9	(11.7)	143.4	29
Net realized and unrealized gains (losses) on investments	69.2	(7.8)	183.3	37
Realized gains due to foreign currency	14	4.7	34.5	10.7
Unrealized (losses) gains due to foreign currency	33.9	(5.5)	51.7	43.1
Total unrealized investment (losses) gains – Level 3 investments	(0.3)	(1.5)	10.1	4.1
Fixed maturity investments
Net realized and unrealized investment gains (losses)
Net realized gains on investments	7.5	4.2	22.4	5
Net unrealized investment gains (losses)	31.4	(8.6)	72.1	12.2
Total unrealized investment (losses) gains – Level 3 investments	0	0.1	0	(2)
Equity securities
Net realized and unrealized investment gains (losses)
Net realized gains on investments	1.7	(0.6)	(0.1)	(0.4)
Net unrealized investment gains (losses)	12	0.9	50.4	2.1
Short-term investments
Net realized and unrealized investment gains (losses)
Net realized gains on investments	6.5	0	9.7	0
Net unrealized investment gains (losses)	4.6	0	6.4	0
Derivative instruments
Net realized and unrealized investment gains (losses)
Net realized gains on investments	(0.7)	0	(1.5)	0
Net unrealized investment gains (losses)	0.9	0	0.2	0
Other long-term investments
Net realized and unrealized investment gains (losses)
Net realized gains on investments	0.3	0.3	9.4	3.4
Net unrealized investment gains (losses)	5	(4)	14.3	14.7
Total unrealized investment (losses) gains – Level 3 investments	$ (0.3)	$ (1.6)	$ 10.1	$ 6.1

Investment securities - Fixed m

Investment securities - Fixed maturity investments (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Fixed maturity investments
Cost or amortized cost	$ 1,702.1	$ 1,952.9
Gross unrealized gains	22.6	4.3
Gross unrealized losses	(3.6)	(28.4)
Net foreign currency gains (losses)	50.3	20.4
Fair value	$ 1,771.4	1,949.2
Weighted average duration of fixed income portfolio including short-term investments	1 year 219 days
Weighted average duration of fixed income portfolio excluding short-term investments	2 years 6 months
Cost or amortized cost
Due in one year or less	$ 155.5	249.6
Due after one year through five years	487.3	635.6
Due after five years through ten years	40.8	26.2
Due after ten years	31.2	0.1
Fair value
Due in one year or less	162.6	254.6
Due after one year through five years	513.6	636.4
Due after five years through ten years	41.7	25.7
Due after ten years	32.3	0.1
Fixed maturity investments
Fixed maturity investments
Fair value	1,771.4	1,949.2
Fixed maturity investments | AAA
Fixed maturity investments
Fair value	573.5	602
Fixed maturity investments | AA
Fixed maturity investments
Fair value	740.8	818
Fixed maturity investments | A
Fixed maturity investments
Fair value	257.9	290.5
Fixed maturity investments | BBB
Fixed maturity investments
Fair value	120.4	167.4
Fixed maturity investments | Other
Fixed maturity investments
Fair value	78.8	71.3
Corporate debt securities
Fixed maturity investments
Cost or amortized cost	517.7	694.1
Gross unrealized gains	6.3	1.4
Gross unrealized losses	(0.3)	(7.3)
Net foreign currency gains (losses)	24	7.6
Fair value	547.7	695.8
Asset-backed securities
Fixed maturity investments
Cost or amortized cost	501.4	496.3
Gross unrealized gains	1.1	0.1
Gross unrealized losses	(1.9)	(3.8)
Net foreign currency gains (losses)	6.6	1.9
Fair value	507.2	494.5
Residential mortgage-backed securities
Fixed maturity investments
Cost or amortized cost	365.9	413
Gross unrealized gains	11.9	1.7
Gross unrealized losses	(0.8)	(7.1)
Net foreign currency gains (losses)	14.5	5.9
Fair value	391.5	413.5
U.S. government and government agency
Fixed maturity investments
Cost or amortized cost	157.6	163.9
Gross unrealized gains	1.7	0.3
Gross unrealized losses	0	(0.5)
Net foreign currency gains (losses)	3	4.2
Fair value	162.3	167.9
Commercial mortgage-backed securities
Fixed maturity investments
Cost or amortized cost	102	117.7
Gross unrealized gains	1.2	0.2
Gross unrealized losses	(0.4)	(2.7)
Net foreign currency gains (losses)	1.8	0.7
Fair value	104.6	115.9
Non-U.S. government and government agency
Fixed maturity investments
Cost or amortized cost	37.8	50.6
Gross unrealized gains	0.3	0
Gross unrealized losses	(0.1)	(0.2)
Net foreign currency gains (losses)	0.4	(0.1)
Fair value	38.4	50.3
Preferred stocks
Fixed maturity investments
Cost or amortized cost	18	14.5
Gross unrealized gains	0.1	0.6
Gross unrealized losses	(0.1)	(6.8)
Net foreign currency gains (losses)	(0.1)	0.2
Fair value	17.9	8.5
Cost or amortized cost
Cost or amortized cost without single maturity date	18	14.5
Fair value
Fair value without single maturity date	17.9	8.5
U.S. States, municipalities and political subdivision
Fixed maturity investments
Cost or amortized cost	1.7	2.8
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Net foreign currency gains (losses)	0.1	0
Fair value	1.8	2.8
Mortgage-backed and asset-backed securities
Cost or amortized cost
Cost or amortized cost without single maturity date	969.3	1,026.9
Fair value
Fair value without single maturity date	1,003.3	1,023.9
Subprime | Fixed maturity investments
Fixed maturity investments
Fair value	50	42.6
Subprime | Fixed maturity investments | AAA
Fixed maturity investments
Fair value	0.2	17.1
Subprime | Fixed maturity investments | AA
Fixed maturity investments
Fair value	26.1	9.8
Subprime | Fixed maturity investments | A
Fixed maturity investments
Fair value	19.8	6
Subprime | Fixed maturity investments | BBB
Fixed maturity investments
Fair value		4.7
Subprime | Fixed maturity investments | Other
Fixed maturity investments
Fair value	$ 3.9	$ 5

Investment securities - Equity

Investment securities - Equity securities and Other long-term investments (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Equity securities
Equity securities and Other long-term investments
Cost or amortized cost	$ 359.4	$ 409.4
Gross unrealized gains	46.8	17.8
Gross unrealized losses	(35.2)	(50.8)
Net foreign currency gains	13.3	3.6
Fair value	384.3	380
Other long-term investments
Equity securities and Other long-term investments
Cost or amortized cost	332.6	337.6
Gross unrealized gains	52.7	32.6
Gross unrealized losses	(29.7)	(13.5)
Net foreign currency gains	12.8	8.3
Fair value	368.4	365
Other long-term investments | Hedge funds and private equity funds
Equity securities and Other long-term investments
Fair value	287.7	301.4
Other long-term investments | Limited liability companies and private equity securities
Equity securities and Other long-term investments
Fair value	80.7	63.6
Investment grade fixed income mutual funds
Equity securities and Other long-term investments
Fair value	150.9	157.7
Common shares
Equity securities and Other long-term investments
Fair value	231.8	222.3
Other
Equity securities and Other long-term investments
Fair value	$ 1.6	$ 0

Investment securities - Hedge F

Investment securities - Hedge Funds and Private Equity Funds (Details) - Other long-term investments $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)fund	Dec. 31, 2018USD ($)
Equity securities and Other long-term investments
Fair Value	$ 368.4	$ 365
Hedge funds and private equity funds
Equity securities and Other long-term investments
Fair Value	287.7	301.4
Unfunded Commitments	$ 67.2	82
Hedge funds:
Equity securities and Other long-term investments
Number of investment funds in which the investments are held | fund	9
Fair Value	$ 125.6	118.3
Unfunded Commitments	0	0
Long/short multi-sector
Equity securities and Other long-term investments
Fair Value	50.6	41
Unfunded Commitments	0	0
Distressed mortgage credit
Equity securities and Other long-term investments
Fair Value	52.3	54.8
Unfunded Commitments	0	0
Private Credit
Equity securities and Other long-term investments
Fair Value	21.2	20
Unfunded Commitments	0
Other
Equity securities and Other long-term investments
Fair Value	1.5	2.5
Unfunded Commitments	$ 0	0
Private equity funds:
Equity securities and Other long-term investments
Number of investment funds in which the investments are held | fund	29
Fair Value	$ 162.1	183.1
Unfunded Commitments	67.2	82
Energy infrastructure & services
Equity securities and Other long-term investments
Fair Value	64.2	93.7
Unfunded Commitments	41.4	54.2
Multi-sector
Equity securities and Other long-term investments
Fair Value	10.4	9
Unfunded Commitments	7.9	0.7
Healthcare
Equity securities and Other long-term investments
Fair Value	31.9	31.7
Unfunded Commitments	10.8	15.6
Life settlement
Equity securities and Other long-term investments
Fair Value	25.7	23.7
Unfunded Commitments	0	0
Manufacturing/Industrial
Equity securities and Other long-term investments
Fair Value	27.8	23.6
Unfunded Commitments	3.8	10.4
Private equity secondaries
Equity securities and Other long-term investments
Fair Value	0.6	1.1
Unfunded Commitments	0.8	1.1
Real estate
Equity securities and Other long-term investments
Fair Value	0.3	0.3
Unfunded Commitments	0	0
Other
Equity securities and Other long-term investments
Fair Value	1.2	0
Unfunded Commitments	$ 2.5	$ 0

Investment securities - Hedge_2

Investment securities - Hedge Funds redemption frequency and Private Equity Fund lock-up period (Details) - Other long-term investments - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Equity securities and Other long-term investments
Fair Value	$ 368.4	$ 365
Hedge funds:
Equity securities and Other long-term investments
Fair Value	125.6	118.3
Hedge funds: | Monthly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	35.7
Hedge funds: | Quarterly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0.8
Hedge funds: | Semi-annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0.3
Hedge funds: | Annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	88.8
Private equity funds:
Equity securities and Other long-term investments
Fair Value	162.1	$ 183.1
Private equity funds: | Lock up period of 1 - 3 years
Equity securities and Other long-term investments
Fair Value	10.3
Private equity funds: | Lock up period of 3 - 5 years
Equity securities and Other long-term investments
Fair Value	3.3
Private equity funds: | Lock up period of 5 - 10 years
Equity securities and Other long-term investments
Fair Value	148.5
30-59 days notice | Hedge funds:
Equity securities and Other long-term investments
Fair Value	0.8
30-59 days notice | Hedge funds: | Monthly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
30-59 days notice | Hedge funds: | Quarterly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0.8
30-59 days notice | Hedge funds: | Semi-annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
30-59 days notice | Hedge funds: | Annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
60-89 days notice | Hedge funds:
Equity securities and Other long-term investments
Fair Value	50.9
60-89 days notice | Hedge funds: | Monthly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	35.7
60-89 days notice | Hedge funds: | Quarterly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
60-89 days notice | Hedge funds: | Semi-annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0.3
60-89 days notice | Hedge funds: | Annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	14.9
90-119 days notice | Hedge funds:
Equity securities and Other long-term investments
Fair Value	52.7
90-119 days notice | Hedge funds: | Monthly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
90-119 days notice | Hedge funds: | Quarterly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
90-119 days notice | Hedge funds: | Semi-annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
90-119 days notice | Hedge funds: | Annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	52.7
120+ days notice | Hedge funds:
Equity securities and Other long-term investments
Fair Value	21.2
120+ days notice | Hedge funds: | Monthly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
120+ days notice | Hedge funds: | Quarterly Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
120+ days notice | Hedge funds: | Semi-annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	0
120+ days notice | Hedge funds: | Annual Redemption Frequency
Equity securities and Other long-term investments
Fair Value	$ 21.2

Investment securities - Investm

Investment securities - Investments held on deposit or as collateral and Unsettled investment purchases and sales (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Marketable securities
Investments held in trusts	$ 797.8	$ 792.4
Investments held in trusts - fair value	817.5	801.2
Accounts payable
Marketable securities
Unsettled investment purchases	34.7	3.2
Accounts receivable
Marketable securities
Unsettled investment sales	12.9	5
Interest rate cap | Derivatives not designated as hedging instruments
Marketable securities
Collateral balances held	$ 0.2	$ 0.3

Fair value measurements - Fair

Fair value measurements - Fair Value Measurements by Level (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Assets measured at fair value
Fixed maturity investments, trading at fair value	$ 1,771.4	$ 1,949.2
Equity securities	384.3	380
Short-term investments, at fair value	989.3	715.5
Other long-term investments	80.7	63.6
Total investments	3,225.7	3,108.3
Derivative instruments	6.3	4.1
Total assets measured at fair value	3,232	3,112.4
Liabilities measured at fair value
Contingent consideration liabilities	26	28.8
Derivative instruments	6.9	5.1
Total liabilities measured at fair value	32.9	33.9
Corporate debt securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	547.7	695.8
Residential mortgage-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	391.5	413.5
U.S. government and government agency
Assets measured at fair value
Fixed maturity investments, trading at fair value	162.3	167.9
Asset-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	507.2	494.5
Commercial mortgage-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	104.6	115.9
Non-U.S. government and government agency
Assets measured at fair value
Fixed maturity investments, trading at fair value	38.4	50.3
Preferred stocks
Assets measured at fair value
Fixed maturity investments, trading at fair value	17.9	8.5
U.S. States, municipalities, and political subdivision
Assets measured at fair value
Fixed maturity investments, trading at fair value	1.8	2.8
Investment grade fixed income mutual funds
Assets measured at fair value
Equity securities	150.9	157.7
Common shares
Assets measured at fair value
Equity securities	231.8	222.3
Other
Assets measured at fair value
Equity securities	1.6
Hedge funds and private equity funds
Liabilities measured at fair value
Fair value of hedges	287.7	301.4	$ 281.5
Level 1
Assets measured at fair value
Fixed maturity investments, trading at fair value	182.2	207.6
Equity securities	382.7	380
Short-term investments, at fair value	978.8	679.3
Other long-term investments	0	0
Total investments	1,543.7	1,266.9
Derivative instruments	1.6	0
Total assets measured at fair value	1,545.3	1,266.9
Liabilities measured at fair value
Contingent consideration liabilities	0	0
Derivative instruments	0	0.5
Total liabilities measured at fair value	0	0.5
Level 1 | Corporate debt securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 1 | Residential mortgage-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 1 | U.S. government and government agency
Assets measured at fair value
Fixed maturity investments, trading at fair value	160.9	164.7
Level 1 | Asset-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 1 | Commercial mortgage-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 1 | Non-U.S. government and government agency
Assets measured at fair value
Fixed maturity investments, trading at fair value	21.3	42.9
Level 1 | Preferred stocks
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 1 | U.S. States, municipalities, and political subdivision
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 1 | Investment grade fixed income mutual funds
Assets measured at fair value
Equity securities	150.9	157.7
Level 1 | Common shares
Assets measured at fair value
Equity securities	231.8	222.3
Level 1 | Other
Assets measured at fair value
Equity securities	0
Level 2
Assets measured at fair value
Fixed maturity investments, trading at fair value	1,572.2	1,736.2
Equity securities	1.6	0
Short-term investments, at fair value	10.5	36.2
Other long-term investments	0	0
Total investments	1,584.3	1,772.4
Derivative instruments	0	0
Total assets measured at fair value	1,584.3	1,772.4
Liabilities measured at fair value
Contingent consideration liabilities	0	0
Derivative instruments	0	0
Total liabilities measured at fair value	0	0
Level 2 | Corporate debt securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	547.7	695.8
Level 2 | Residential mortgage-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	391.5	413.5
Level 2 | U.S. government and government agency
Assets measured at fair value
Fixed maturity investments, trading at fair value	1.4	3.2
Level 2 | Asset-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	507.2	494.5
Level 2 | Commercial mortgage-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	104.6	115.9
Level 2 | Non-U.S. government and government agency
Assets measured at fair value
Fixed maturity investments, trading at fair value	17.1	7.4
Level 2 | Preferred stocks
Assets measured at fair value
Fixed maturity investments, trading at fair value	0.9	3.1
Level 2 | U.S. States, municipalities, and political subdivision
Assets measured at fair value
Fixed maturity investments, trading at fair value	1.8	2.8
Level 2 | Investment grade fixed income mutual funds
Assets measured at fair value
Equity securities	0	0
Level 2 | Common shares
Assets measured at fair value
Equity securities	0	0
Level 2 | Other
Assets measured at fair value
Equity securities	1.6
Level 3
Assets measured at fair value
Fixed maturity investments, trading at fair value	17	5.4
Equity securities	0	0
Short-term investments, at fair value	0	0
Other long-term investments	80.7	63.6
Total investments	97.7	69
Derivative instruments	4.7	4.1
Total assets measured at fair value	102.4	73.1
Liabilities measured at fair value
Contingent consideration liabilities	26	28.8
Derivative instruments	6.9	4.6
Total liabilities measured at fair value	32.9	33.4
Level 3 | Corporate debt securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 3 | Residential mortgage-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 3 | U.S. government and government agency
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 3 | Asset-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 3 | Commercial mortgage-backed securities
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 3 | Non-U.S. government and government agency
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 3 | Preferred stocks
Assets measured at fair value
Fixed maturity investments, trading at fair value	17	5.4
Level 3 | U.S. States, municipalities, and political subdivision
Assets measured at fair value
Fixed maturity investments, trading at fair value	0	0
Level 3 | Investment grade fixed income mutual funds
Assets measured at fair value
Equity securities	0	0
Level 3 | Common shares
Assets measured at fair value
Equity securities	0	$ 0
Level 3 | Other
Assets measured at fair value
Equity securities	$ 0

Fair value measurements - Rollf

Fair value measurements - Rollforward of Level 3 Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Rollforward of Level 3, Derivative instruments assets & (liabilities)
Balance at beginning of the period	$ (3.6)	$ (5.8)	$ (0.5)	$ (6.1)
Total realized and unrealized gains (losses)	(2)	1.7	(7.7)	7.3
Foreign currency gains (losses) through Other Comprehensive Income	0	0	0	0
Purchases	0	0	0	0
Sales/Settlements	3.4	(0.7)	6	(6)
Balance at end of the period	(2.2)	(4.8)	(2.2)	(4.8)
Contingent consideration (liabilities)
Rollforward of Level 3, (liabilities)
Balance at beginning of the period	(30.8)	(42.8)	(28.8)	(42.8)
Total realized and unrealized gains (losses)	(2.1)	0	(4.1)	0
Foreign currency gains (losses) through Other Comprehensive Income	0	0	0	0
Purchases	0	0	0	0
Sales/Settlements	6.9	0.9	6.9	0.9
Balance at end of the period	(26)	(41.9)	(26)	(41.9)
Hedge funds and private equity funds
Rollforward of Level 3, (liabilities)
Fair value of hedges	287.7	281.5	287.7	281.5	$ 301.4
Fixed maturity investments | Investments
Rollforward of Level 3 Fair Value Measurements
Balance at beginning of the period	0	6	5.4	8
Total realized and unrealized gains (losses)	0	0.1	0	(2)
Gains (losses) through Other Comprehensive Income	0	0	0	0
Purchases	17	2.4	17	3
Sales/Settlements	0	0	(5.4)	(0.5)
Balance at end of the period	17	8.5	17	8.5
Other long-term investments | Investments
Rollforward of Level 3 Fair Value Measurements
Balance at beginning of the period	88	69	63.6	64.2
Total realized and unrealized gains (losses)	(0.3)	(1.6)	10.6	7.7
Gains (losses) through Other Comprehensive Income	(1)	0.1	(1.5)	(1.5)
Purchases	0	0.2	15.8	1.2
Sales/Settlements	(6)	(0.2)	(7.8)	(4.1)
Balance at end of the period	$ 80.7	$ 67.5	$ 80.7	$ 67.5

Fair value measurements - Signi

Fair value measurements - Significant Unobservable Inputs (Details) $ in Millions	Sep. 30, 2019USD ($)$ / shares	Dec. 31, 2018USD ($)$ / shares
Significant Unobservable Inputs
Equity securities	$ 384.3	$ 380
Derivative assets	6.3	4.1
Derivative liabilities	(6.9)	(5.1)
Contingent consideration	(26)	(28.8)
Level 3
Significant Unobservable Inputs
Equity securities	0	0
Derivative assets	4.7	4.1
Derivative liabilities	(6.9)	(4.6)
Contingent consideration	(26)	(28.8)
Level 3 | Share price of recent transaction | Private equity securities
Significant Unobservable Inputs
Equity securities	32.5	32.5
Level 3 | Share price of recent transaction | Preferred stock 1
Significant Unobservable Inputs
Equity securities	17.5	4.6
Level 3 | Share price of recent transaction | Preferred stock 2
Significant Unobservable Inputs
Equity securities		0.8
Level 3 | Share price of recent transaction | Private equity securities 2
Significant Unobservable Inputs
Equity securities	$ 5.1
Level 3 | Share price of recent transaction | Private equity securities 4
Significant Unobservable Inputs
Equity securities		$ 0.3
Level 3 | Share price of recent transaction | Purchase share price | Private equity securities
Significant Unobservable Inputs
Equity securities, measurement input | $ / shares	40.63	40.63
Level 3 | Share price of recent transaction | Purchase price | Preferred stock 1
Significant Unobservable Inputs
Equity securities, measurement input | $ / shares	7.74	1.88
Level 3 | Share price of recent transaction | Purchase price | Preferred stock 2
Significant Unobservable Inputs
Equity securities, measurement input, value		$ 0.8
Level 3 | Share price of recent transaction | Purchase price | Private equity securities 2
Significant Unobservable Inputs
Equity securities, measurement input | $ / shares	7.74
Level 3 | Share price of recent transaction | Purchase price | Private equity securities 4
Significant Unobservable Inputs
Equity securities, measurement input | $ / shares		10
Level 3 | Purchase price of recent transaction | Preferred stock 2
Significant Unobservable Inputs
Equity securities	$ 12.2
Level 3 | Purchase price of recent transaction | Private debt instrument
Significant Unobservable Inputs
Private debt instrument	7.8	$ 9
Level 3 | Purchase price of recent transaction | Private debt instrument 1
Significant Unobservable Inputs
Private debt instrument		6
Level 3 | Purchase price of recent transaction | Preferred stock 3
Significant Unobservable Inputs
Equity securities	4.8
Level 3 | Purchase price of recent transaction | Private equity securities 3
Significant Unobservable Inputs
Equity securities	1	0.9
Level 3 | Purchase price of recent transaction | Private equity securities 4
Significant Unobservable Inputs
Equity securities	0.2
Level 3 | Purchase price of recent transaction | Private debt instrument 2
Significant Unobservable Inputs
Private debt instrument		0.2
Level 3 | Purchase price of recent transaction | Purchase price | Preferred stock 2
Significant Unobservable Inputs
Equity securities, measurement input, value	12.2
Level 3 | Purchase price of recent transaction | Purchase price | Private debt instrument
Significant Unobservable Inputs
Private debt instrument, measurement input, value	9	9
Level 3 | Purchase price of recent transaction | Purchase price | Private debt instrument 1
Significant Unobservable Inputs
Private debt instrument, measurement input, value		$ 6
Level 3 | Purchase price of recent transaction | Purchase price | Preferred stock 3
Significant Unobservable Inputs
Equity securities, measurement input, value	$ 4.8
Level 3 | Purchase price of recent transaction | Purchase price | Private equity securities 3
Significant Unobservable Inputs
Equity securities, measurement input | $ / shares	10	1.88
Level 3 | Purchase price of recent transaction | Purchase price | Private equity securities 4
Significant Unobservable Inputs
Equity securities, measurement input, value	$ 0.2
Level 3 | Purchase price of recent transaction | Purchase price | Private debt instrument 2
Significant Unobservable Inputs
Private debt instrument, measurement input, value		$ 0.2
Level 3 | Multiple of GAAP book value | Private equity securities 1
Significant Unobservable Inputs
Equity securities	$ 16.6	$ 14.7
Level 3 | Multiple of GAAP book value | Book value multiple | Private equity securities 1
Significant Unobservable Inputs
Equity securities, measurement input	1	0.9
Level 3 | Third party appraisal | Weather derivatives
Significant Unobservable Inputs
Derivative assets	$ 4	$ 3.9
Level 3 | Third party appraisal | Interest rate cap
Significant Unobservable Inputs
Derivative assets		0.2
Level 3 | Third party appraisal | Foreign currency swaps
Significant Unobservable Inputs
Derivative liabilities	(1.2)	(4.6)
Level 3 | Third party appraisal | Currency forwards
Significant Unobservable Inputs
Derivative liabilities	(5.7)
Level 3 | Third party appraisal | Broker quote | Weather derivatives
Significant Unobservable Inputs
Derivative assets, measurement input, value	4	3.9
Level 3 | Third party appraisal | Broker quote | Interest rate cap
Significant Unobservable Inputs
Derivative assets, measurement input, value		0.2
Level 3 | Third party appraisal | Broker quote | Foreign currency swaps
Significant Unobservable Inputs
Derivative liabilities, measurement input, value	(1.2)	(4.6)
Level 3 | Third party appraisal | Broker quote | Currency forwards
Significant Unobservable Inputs
Derivative liabilities, measurement input, value	(5.7)
Level 3 | Option pricing model
Significant Unobservable Inputs
Equity securities	$ 0.7
Level 3 | Option pricing model | Strike price
Significant Unobservable Inputs
Equity securities, measurement input | $ / shares	0.2
Level 3 | External valuation model
Significant Unobservable Inputs
Contingent consideration	$ (26)	(28.8)
Level 3 | External valuation model | Discounted future payments
Significant Unobservable Inputs
Contingent consideration, measurement input, value	$ (26)	$ (28.8)

Fair value measurements - Finan

Fair value measurements - Financial instruments disclosed, but not carried at fair value (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Financial instruments not carried at fair value
Debt	$ 670.3	$ 696.8
Carrying Value | Series B preference shares
Financial instruments not carried at fair value
Redeemable preference shares	236	232.2
2017 SEK Subordinated Notes
Financial instruments not carried at fair value
Debt	276.5	303.6
2017 SEK Subordinated Notes | Carrying Value
Financial instruments not carried at fair value
Debt	276.5	303.6
2016 SIG Senior Notes
Financial instruments not carried at fair value
Debt	393.8	393.2
2016 SIG Senior Notes | Carrying Value
Financial instruments not carried at fair value
Debt	393.8	393.2
Level 3 | Fair Value | Series B preference shares
Financial instruments not carried at fair value
Redeemable preference shares	195	191.7
Level 3 | 2017 SEK Subordinated Notes | Fair Value
Financial instruments not carried at fair value
Debt	279.8	309.5
Level 3 | 2016 SIG Senior Notes | Fair Value
Financial instruments not carried at fair value
Debt	$ 397.3	$ 347.6

Debt and standby letters of c_3

Debt and standby letters of credit facilities (Details)	Sep. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018	Sep. 22, 2017USD ($)	Sep. 22, 2017SEK (kr)	Nov. 01, 2016USD ($)
Debt and standby letters of credit facilities
Long-term Debt, Total	$ 670,300,000	$ 696,800,000
2017 SEK Subordinated Notes
Debt and standby letters of credit facilities
Debt, at face value	280,200,000	307,600,000		$ 346,100,000	kr 2,750,000,000
Unamortized issuance costs	(3,700,000)	(4,000,000)
Long-term Debt, Total	$ 276,500,000	$ 303,600,000
Effective rate	4.00%	3.80%	3.50%
2016 SIG Senior Notes
Debt and standby letters of credit facilities
Debt, at face value	$ 400,000,000	$ 400,000,000				$ 400,000,000
Unamortized issuance costs	(3,800,000)	(4,200,000)
Unamortized discount	(2,400,000)	(2,600,000)
Long-term Debt, Total	$ 393,800,000	$ 393,200,000
Effective rate	4.70%	4.70%

Debt and standby letters of c_4

Debt and standby letters of credit facilities - 2017 SEK Subordinated Notes and 2016 SIG Senior Notes (Details)	Sep. 22, 2017USD ($)	Sep. 22, 2017SEK (kr)	Nov. 01, 2016USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)	Sep. 22, 2017SEK (kr)
Debt and standby letters of credit facilities
Interest expense on debt				$ 7,700,000	$ 7,600,000	$ 23,300,000	$ 23,100,000
2017 SEK Subordinated Notes
Debt and standby letters of credit facilities
Debt notes issued	$ 346,100,000			280,200,000		280,200,000		$ 307,600,000	kr 2,750,000,000
Issue price (as a percent)	100.00%	100.00%
Term of redemption following occurrence of Specified Event (in days)	90 days	90 days
Debt issuance costs	$ 4,600,000
Underwriting fees	$ 3,500,000	kr 27,500,000
Foreign currency exchange (losses) gains on remeasurement of debt				$ 15,900,000	$ (1,600,000)	$ 27,200,000	$ 26,200,000
Effective rate				4.10%	3.50%
Effective rate				4.00%	3.50%	4.00%	3.50%	3.80%
Interest expense on debt				$ 3,000,000	$ 2,900,000	$ 8,900,000	$ 8,800,000
2016 SIG Senior Notes
Debt and standby letters of credit facilities
Debt notes issued			$ 400,000,000	$ 400,000,000		$ 400,000,000		$ 400,000,000
Issue price (as a percent)			99.209%
Debt issuance costs			$ 5,100,000
Underwriting fees			3,400,000
Effective rate				4.70%		4.70%		4.70%
Interest expense on debt				$ 4,800,000	$ 4,800,000	$ 14,300,000	$ 14,300,000
Net proceeds			$ 392,400,000
Annual interest rate (as a percent)			4.60%

Debt and standby letters of c_5

Debt and standby letters of credit facilities - Standby Letter of Credit Facilities (Details) kr in Billions	Sep. 30, 2019USD ($)	Sep. 30, 2019SEK (kr)	Dec. 31, 2018USD ($)	Dec. 31, 2018SEK (kr)	Nov. 09, 2018USD ($)letter_of_credit
Standby Letter of Credit Facilities
Number of standby letter of credit agreements renewed | letter_of_credit					2
Other Secured Letter of Credit and Trust Arrangement | Sirius America Insurance Company
Standby Letter of Credit Facilities
Secured letter of credit and trust arrangements were collateralized by pledged assets and assets in trust	$ 57,500,000		$ 56,200,000
Other Secured Letter of Credit and Trust Arrangement | Sirius Bermuda Insurance Company Ltd.
Standby Letter of Credit Facilities
Secured letter of credit and trust arrangements were collateralized by pledged assets and assets in trust	350,600,000		319,700,000
Sirius International | Nordea Bank Finland Abp
Standby Letter of Credit Facilities
Borrowing capacity					$ 125,000,000
Sirius International | DNB Bank ASA London Branch
Standby Letter of Credit Facilities
Borrowing capacity					35,000,000
Sirius International | Standby Letters of Credit
Standby Letter of Credit Facilities
Borrowing capacity					160,000,000
Sirius International | Unsecured Standby Letters of Credit | DNB Bank ASA London Branch
Standby Letter of Credit Facilities
Borrowing capacity					$ 25,000,000
Sirius International | Other Secured Letter of Credit and Trust Arrangement
Standby Letter of Credit Facilities
Secured letter of credit and trust arrangements were collateralized by pledged assets and assets in trust	$ 300,500,000	kr 2.9	$ 321,300,000	kr 2.9

Debt and standby letters of c_6

Debt and standby letters of credit facilities - Revolving Credit Facility (Details) - USD ($)	1 Months Ended
	Feb. 28, 2018	Sep. 30, 2019
Line of Credit Facility [Line Items]
Outstanding amount		$ 0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument, term	3 years
Borrowing capacity	$ 300,000,000

Debt and standby letters of c_7

Debt and standby letters of credit facilities - Interest (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt Disclosure [Abstract]
Interest expense on debt	$ 7.7	$ 7.6	$ 23.3	$ 23.1
Total interest paid	$ 2.8	$ 2.9	$ 17.7	$ 17.9

Income taxes (Details)

Income taxes (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (3,700,000)	$ (6,900,000)	$ 15,600,000	$ 55,400,000
Pre-tax income (loss)	$ (11,300,000)	$ (34,600,000)	$ 120,300,000	$ 169,200,000
Effective tax rate (as a percent)			13.00%	32.70%
Statutory tax rate (as a percent)			21.40%	22.00%
Tax Cuts and Jobs Act of 2017, BEAT tax rate, 2019-2025 (as a percent)			10.00%
Tax Cuts and Jobs Act of 2017, BEAT tax rate, 2026 and thereafter (as a percent)			12.50%
Provision for income taxes related to BEAT			$ 0		$ 0
Provision for income taxes related to GILTI			$ 0		$ 0

Income taxes - Deferred tax ass

Income taxes - Deferred tax asset, net of valuation allowance and Uncertain tax positions (Details) $ in Millions	Sep. 30, 2019USD ($)
Income taxes
Net deferred tax liability, net of valuation allowance	$ 45.8
Other net deferred tax liabilities	2.9
Uncertain tax positions
Total reserve for unrecognized tax benefits	59.1
Reversal of reserves for unrecognized tax benefits on permanent differences and interest and penalties	58.9
Reversal of reserves for unrecognized tax benefits on temporary differences	0.2
U.S. subsidiaries
Income taxes
Net deferred tax assets	33.6
Luxembourg subsidiaries
Income taxes
Net deferred tax assets	118.5
United Kingdom subsidiaries
Income taxes
Net deferred tax assets	13.6
Sweden subsidiaries
Income taxes
Net deferred tax assets	208.6
Swedish Tax Authority | Sweden subsidiaries
Uncertain tax positions
Reserve attributable to uncertain tax positions	$ 56.2

Derivatives - Interest Rate Cap

Derivatives - Interest Rate Cap (Details) - Interest rate cap $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)financial_institution	Dec. 31, 2018USD ($)
Derivatives
Number of financial institutions entered into derivative contracts | financial_institution	2
Derivatives not designated as hedging instruments
Derivatives
Collateral balances held | $	$ 0.2	$ 0.3

Derivatives - Classification an

Derivatives - Classification and Fair Value of Derivatives in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivatives
Derivative assets	$ 6.3	$ 4.1
Derivative liabilities	6.9	5.1
Interest rate cap | Derivatives not designated as hedging instruments
Derivatives
Notional Value	250	250
Interest rate cap | Derivatives not designated as hedging instruments | Other assets
Derivatives
Derivative assets	0	0.2
Interest rate cap | Derivatives not designated as hedging instruments | Other liabilities
Derivatives
Derivative liabilities	0	0
Foreign currency swaps | Derivatives not designated as hedging instruments
Derivatives
Notional Value	90	45
Foreign currency swaps | Derivatives not designated as hedging instruments | Other assets
Derivatives
Derivative assets	0	0
Foreign currency swaps | Derivatives not designated as hedging instruments | Other liabilities
Derivatives
Derivative liabilities	1.2	4.6
Foreign currency forwards | Derivatives not designated as hedging instruments
Derivatives
Notional Value	5	0
Foreign currency forwards | Derivatives not designated as hedging instruments | Other assets
Derivatives
Derivative assets	0	0
Foreign currency forwards | Derivatives not designated as hedging instruments | Other liabilities
Derivatives
Derivative liabilities	5.7	0
Weather derivatives | Derivatives not designated as hedging instruments
Derivatives
Notional Value	95.5	150.5
Weather derivatives | Derivatives not designated as hedging instruments | Other assets
Derivatives
Derivative assets	4	3.9
Weather derivatives | Derivatives not designated as hedging instruments | Other liabilities
Derivatives
Derivative liabilities	0	0
Equity futures contracts | Derivatives not designated as hedging instruments
Derivatives
Notional Value	1.8	0
Equity futures contracts | Derivatives not designated as hedging instruments | Other assets
Derivatives
Derivative assets	0	0
Equity futures contracts | Derivatives not designated as hedging instruments | Other liabilities
Derivatives
Derivative liabilities	0	0
Equity put options | Derivatives not designated as hedging instruments
Derivatives
Notional Value	23.4	6.2
Equity put options | Derivatives not designated as hedging instruments | Other assets
Derivatives
Derivative assets	1.9	0
Equity put options | Derivatives not designated as hedging instruments | Other liabilities
Derivatives
Derivative liabilities	0.3	0.5
Equity warrants | Derivatives not designated as hedging instruments
Derivatives
Notional Value	0.7	0
Equity warrants | Derivatives not designated as hedging instruments | Other assets
Derivatives
Derivative assets	0.7	0
Equity warrants | Derivatives not designated as hedging instruments | Other liabilities
Derivatives
Derivative liabilities	$ 0	$ 0

Derivatives - Classification _2

Derivatives - Classification and Fair Value of Derivatives in Consolidated of (Loss) Income Statements (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest rate cap | Other revenues
Derivatives
Gains (losses) recognized in earnings	$ 0	$ 0	$ (0.2)	$ 0.2
Foreign currency swaps | Net foreign exchange gains (losses)
Derivatives
Gains (losses) recognized in earnings	3.7	(0.1)	6.1	2.9
Foreign currency forwards | Net foreign exchange gains (losses)
Derivatives
Gains (losses) recognized in earnings	(7.8)	0	(10.8)	0
Weather derivatives | Other revenues
Derivatives
Gains (losses) recognized in earnings	1.9	1.8	(3.6)	4.2
Equity futures contracts | Net realized investment gains (losses)
Derivatives
Gains (losses) recognized in earnings	0.1	0	(0.7)	0
Equity futures contracts | Net unrealized investment gains
Derivatives
Gains (losses) recognized in earnings	(0.5)	0	(0.6)	0
Equity put options | Net realized investment gains (losses)
Derivatives
Gains (losses) recognized in earnings	(0.8)	0	(0.8)	0
Equity put options | Net unrealized investment gains
Derivatives
Gains (losses) recognized in earnings	0.7	0	0.2	0
Equity warrants | Net unrealized investment gains
Derivatives
Gains (losses) recognized in earnings	$ 0.3	$ 0	$ 0.7	$ 0

Share-based compensation (Detai

Share-based compensation (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Share-based compensation
Unrecognized share-based compensation costs	$ 27,100,000	$ 27,100,000	$ 0
Minimum
Share-based compensation
Expected period of recognition (in years)		2 years
Maximum
Share-based compensation
Expected period of recognition (in years)		3 years
Restricted shares
Share-based compensation
Shares granted to employees (in shares)	2,424	37,039
Performance share units
Share-based compensation
Shares granted to employees (in shares)	7,059	408,370
Shares forfeited to employees (in shares)	43,230	57,565
Restricted share units
Share-based compensation
Shares granted to employees (in shares)	16,471	1,428,185
Shares forfeited to employees (in shares)	25,936	71,988
Stock options | Officer
Share-based compensation
Stock options granted to employees (in shares)		1,374,944

Common shareholder's equity, _3

Common shareholder's equity, mezzanine equity, and non controlling interests - Common shareholder's equity (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Common shareholder's equity
Common shares authorized (in shares)	500,000,000		500,000,000
Common shares par value (in usd per share)	$ 0.01		$ 0.01
Preference shares authorized / designated ( in shares)	100,000,000		100,000,000
Preference shares par value (usd per share)	$ 0.01		$ 0.01
Changes in common shareholders' equity
Shares issued, beginning of period (in shares)	115,296,918	120,000,000	115,151,251	120,000,000
Shares outstanding, beginning of period (in shares)	115,296,918	120,000,000	115,151,251	120,000,000
Issuance of shares to directors and employees (in shares)	2,424	0	148,091	0
Shares issued, end of period (in shares)	115,299,342	120,000,000	115,299,342	120,000,000
Shares outstanding, end of period (in shares)	115,299,342	120,000,000	115,299,342	120,000,000

Common shareholder's equity, _4

Common shareholder's equity, mezzanine equity, and non controlling interests - Mezzanine equity (Details) - USD ($) $ / shares in Units, $ in Millions	Nov. 05, 2018	Sep. 30, 2019	Dec. 31, 2018
Mezzanine equity
Preference shares authorized / designated ( in shares)		100,000,000
Preference shares par value (usd per share)		$ 0.01
Carrying value of preference shares		$ 236	$ 232.2
Series B preference shares
Mezzanine equity
Preference shares authorized / designated ( in shares)	15,000,000
Preference shares par value (usd per share)	$ 0.01
Preferential rights, aggregate gross proceeds from the issuance of senior or pari passu shares		$ 100
Series B preference shares | Sirius Group Private Placement | Preference Share Investors
Mezzanine equity
Share subscriptions (in shares)	11,901,670
Series A redeemable preference shares | IMGAH
Mezzanine equity
Preference shares authorized / designated ( in shares)		150,000
Number of convertible preferred shares issued as a consideration (in shares)	100,000	100,000
Redeemable preference share liquidation preference per share (in usd per share)		$ 1,000
Redemption amount of preference shares	$ 95
Gain on redemption of preference shares	$ 13.8

Common shareholder's equity, _5

Common shareholder's equity, mezzanine equity, and non controlling interests - Non-controlling interests (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Change in non-controlling interest
Non-controlling interests, beginning of the period	$ 3	$ 1	$ 1.7	$ 0.2
Net income attributable to non-controlling interests	0.4	0.3	1.6	0.9
Other, net	0	(0.2)	0.1	0
Non-controlling interests, end of the period	3.4	$ 1.1	3.4	$ 1.1
Alstead Re
Change in non-controlling interest
Non-controlling interests, beginning of the period			1.7
Non-controlling interests, end of the period	$ 3.3		$ 3.3

Earnings per share - Basic and

Earnings per share - Basic and Diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ (7.6)	$ (27.7)	$ 104.7	$ 113.8
Less: Income attributable to non-controlling interests	(0.4)	(0.3)	(1.6)	(0.9)
Less: Change in carrying value of Series B preference shares	5.3	0	(3.9)	0
Less: Accrued dividends on Series A redeemable preference shares	0	0	0	(2.6)
Net (loss) income attributable to Sirius Group's common shareholders	(2.7)	(28)	99.2	110.3
Net income available to Sirius Group common shareholders	(2.7)	(28)	89.9	105.8
Add: Change in carrying value of Series B preference shares	(5.3)	0	0	0
Net income available to Sirius Group common shareholders on a diluted basis	$ (8)	$ (28)	$ 89.9	$ 105.8
Denominator:
Weighted average shares outstanding for basic earnings per share (in shares)	115,251,853	120,000,000	115,225,942	120,000,000
Add: Series B preference shares (in shares)	11,901,670	0	0	0
Add: Unvested performance share units and restricted share units (in shares)	0	0	393,280	0
Weighted average shares outstanding for diluted earnings per share	127,153,523	120,000,000	115,619,222	120,000,000
Earnings per share
Basic earnings per share (in usd per share)	$ (0.02)	$ (0.23)	$ 0.78	$ 0.88
Diluted earnings per share (in usd per share)	$ (0.06)	$ (0.23)	$ 0.78	$ 0.88
Potentially dilutive securities excluded from the calculation of Diluted earnings per share (in shares)	19,537,270		31,045,660	0
Series B preference shares
Numerator:
Less: Earnings attributable to Series B preference shares	$ 0	$ 0	$ (9.3)	$ 0
Series A redeemable preference shares
Numerator:
Less: Earnings attributable to Series B preference shares				$ (4.5)

Investments in unconsolidated_3

Investments in unconsolidated entities - Other long-term investments (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Investments in unconsolidated entities
Other long-term investments	$ 368,400,000	$ 365,000,000
Equity method investments	0	0
Investments in unconsolidated entities
Investments in unconsolidated entities
Other long-term investments	368,400,000	365,000,000
Investments in unconsolidated entities | Equity method eligible investments
Investments in unconsolidated entities
Other long-term investments	143,500,000	169,400,000
Investments in unconsolidated entities | Equity method ineligible investments
Investments in unconsolidated entities
Other long-term investments	$ 224,900,000	$ 195,600,000

Investments in unconsolidated_4

Investments in unconsolidated entities - Equity method unconsolidated entities (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
BE Reinsurance Limited
Investments in unconsolidated entities
Ownership interest	25.00%	25.00%
BioVentures Investors (Offshore) IV LP
Investments in unconsolidated entities
Ownership interest	73.00%	73.00%
NEC Cypress Buyer LLC(1)
Investments in unconsolidated entities
Ownership percentage (less than)	20.00%	20.00%
Investments in unconsolidated entities | Equity method eligible investments | Camden Partners Strategic Fund V (Cayman), LP
Investments in unconsolidated entities
Ownership interest	36.30%	36.40%
Investments in unconsolidated entities | Equity method eligible investments | NEC Cypress Buyer LLC(1)
Investments in unconsolidated entities
Ownership interest	13.30%	13.30%
Investments in unconsolidated entities | Equity method eligible investments | New Energy Capital Infrastructure Credit Fund LP
Investments in unconsolidated entities
Ownership interest	23.30%	22.90%
Investments in unconsolidated entities | Equity method eligible investments | New Energy Capital Infrastructure Offshore Credit Fund LP
Investments in unconsolidated entities
Ownership interest	56.20%	54.90%
Investments in unconsolidated entities | Equity method eligible investments | Scion G7, LP
Investments in unconsolidated entities
Ownership interest	28.80%	28.80%
Investments in unconsolidated entities | Equity method eligible investments | Tuckerman Capital V LP
Investments in unconsolidated entities
Ownership interest	48.20%	47.60%
Investments in unconsolidated entities | Equity method eligible investments | Tuckerman Capital V Co-Investment I LP
Investments in unconsolidated entities
Ownership interest	47.70%	47.70%

Variable interest entities (Det

Variable interest entities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Assets:
Fixed maturity investments, trading at fair value	$ 1,771.4		$ 1,949.2
Short-term investments, at fair value	989.3		715.5
Cash	145.8		119.4
Insurance and reinsurance premiums receivable	842.6		630.6
Funds held by ceding companies	236.8		186.8
Deferred acquisition costs	155.2		141.6
Other assets	164		124
Total assets	6,465.1		6,007.7
Liabilities
Loss and loss adjustment expense reserves	2,186.4	$ 2,023.3	2,016.7	$ 1,891	$ 1,827.1	$ 1,898.5
Unearned insurance and reinsurance premiums	807.7		647.2
Other liabilities	189.1		150.5
Total liabilities	4,483.1		4,069.3
VIEs
Assets:
Fixed maturity investments, trading at fair value	3.9		4
Short-term investments, at fair value	0.5		0.3
Cash	0.1		0.2
Total investments	4.5		4.5
Insurance and reinsurance premiums receivable	(0.3)		0.1
Funds held by ceding companies	4.6		3.7
Deferred acquisition costs	0.3		5.2
Other assets	0.1		0.9
Total assets	9.2		14.4
Liabilities
Loss and loss adjustment expense reserves	0.8		4.6
Unearned insurance and reinsurance premiums	0.6		3.7
Other liabilities	0.1		0
Total liabilities	$ 1.5		$ 8.3

Variable interest entities - Un

Variable interest entities - Unconsolidated VIE (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Variable interest entities
Other long-term investments	$ 368.4	$ 365
Total assets	6,465.1	6,007.7
Unconsolidated VIE
Variable interest entities
Other long-term investments	278.8	209.1
Total assets	278.8	209.1
On-Balance Sheet
Variable interest entities
Other long term investments	114.2	103.1
Total assets	114.2	103.1
Off-Balance Sheet
Variable interest entities
Other long term investments	17.9	32
Total assets	17.9	32
Other long-term investments
Variable interest entities
Other long term investments	132.1	135.1
Total assets	$ 132.1	$ 135.1

Transactions with related par_2

Transactions with related parties (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Transactions with related parties
Gross written premiums	$ 413,700,000	$ 398,000,000	$ 1,523,100,000	$ 1,518,200,000
Receivables due from affiliates	24,100,000		24,100,000		$ 14,300,000
Payables due to affiliates	400,000		400,000		$ 0
Insurance and MGU affiliates, or their subsidiaries
Transactions with related parties
Gross written premiums	$ 21,700,000	$ 14,000,000	$ 70,700,000	$ 52,200,000

Commitments and contingencies -

Commitments and contingencies - Leases (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Leases
Operating lease expense	$ 3.4	$ 9.3
Operating lease right-of-use assets	28.8	28.8
Lease liability	$ 30.7	$ 30.7
Leased offices
Leases
Weighted average lease term (years)	7 years	7 years
Leased equipment
Leases
Weighted average lease term (years)	3 years	3 years

Commitments and contingencies_2

Commitments and contingencies - Lease balances (Details) $ in Millions	Sep. 30, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating lease right-of-use assets	$ 28.8
Current lease liabilities	8.5
Non-current lease liabilities	$ 22.2

Commitments and contingencies_3

Commitments and contingencies - Weighted average remaining lease term and weighted average discount rate (Details)	Sep. 30, 2019
Leased offices
Property, Plant and Equipment [Line Items]
Weighted average lease term (years)	7 years
Weighted average discount rate:	3.70%
Leased equipment
Property, Plant and Equipment [Line Items]
Weighted average lease term (years)	3 years
Weighted average discount rate:	3.40%

Commitments and contingencies_4

Commitments and contingencies - Future annual minimum rental payments (Details) $ in Millions	Sep. 30, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019	$ 2.5
2020	9
2021	7.8
2022	6.9
2023	4.3
2024 and after	2.8
Total future annual minimum rental payments as at June 30, 2019	33.3
Less: present value discount	(2.6)
Lease liability	$ 30.7

Uncategorized Items - sg-201909

Label	Element	Value
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 860,000,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 1,600,000