Assurant (AIZ) 10-Q 3 Aug 23 2023 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2023	Jul. 28, 2023
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	001-31978
Entity Registrant Name	Assurant, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	39-1126612
Entity Address, Address Line One	260 Interstate North Circle SE
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30339
City Area Code	770
Local Phone Number	763-1000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		53,022,687
Entity Central Index Key	0001267238
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock, $0.01 Par Value
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	AIZ
Security Exchange Name	NYSE
5.25% Subordinated Notes due 2061
Entity Listings [Line Items]
Title of 12(b) Security	5.25% Subordinated Notes due 2061
Trading Symbol	AIZN
Security Exchange Name	NYSE

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022
Investments:
Fixed maturity securities available for sale, at fair value (amortized cost - $7,210.8 and $6,920.8 at June 30, 2023 and December 31, 2022, respectively)		$ 6,617.8	$ 6,283.7
Equity securities at fair value		259.6	281.3
Commercial mortgage loans on real estate, at amortized cost (net of allowances for credit losses of $3.1 and $1.8 at June 30, 2023 and December 31, 2022)		302.7	295.6
Short-term investments		279.7	155.5
Other investments		528.8	508.4
Total investments		7,988.6	7,524.5
Cash and cash equivalents		1,401.7	1,536.7
Premiums and accounts receivable (net of allowances for credit losses of $8.6 and $9.2 at June 30, 2023 and December 31, 2022, respectively)		2,342.3	2,406.4
Reinsurance recoverables (net of allowances for credit losses of $4.8 and $5.4 at June 30, 2023 and December 31, 2022, respectively)		6,636.6	6,999.4
Accrued investment income		90.7	85.1
Deferred acquisition costs		9,818.5	9,677.1
Property and equipment, net		642.7	645.1
Goodwill		2,606.3	2,603
Value of business acquired		166.4	262.8
Other intangible assets, net		608.4	638.9
Other assets (net of allowances for credit losses of $1.2 and $1.7 at June 30, 2023 and December 31, 2022, respectively) (1)	[1]	802.5	738.3
Total assets		33,104.7	33,117.3
Liabilities
Future policy benefits and expenses		523.4	507.9
Unearned premiums		19,931.3	19,802.4
Claims and benefits payable		2,020.3	2,210
Commissions payable		626.7	647.5
Reinsurance balances payable		482.6	492.8
Funds held under reinsurance		376.2	366.6
Accounts payable and other liabilities (including allowances for credit losses of $10.5 and $10.3 at June 30, 2023 and December 31, 2022, respectively, for the unsecured portion of the high deductible recoverables)		2,528.8	2,731.5
Debt		2,129.4	2,129.9
Total liabilities		28,618.7	28,888.6
Commitments and contingencies (Note 15)
Stockholders’ equity
Common stock, par value $0.01 per share, 800,000,000 shares authorized, 55,304,730 and 55,126,470 shares issued and 53,008,641 and 52,830,381 shares outstanding at June 30, 2023 and December 31, 2022, respectively		0.6	0.6
Additional paid-in capital		1,653.7	1,637.8
Retained earnings		3,877.2	3,699.3
Accumulated other comprehensive loss		(922.7)	(986.2)
Treasury stock, at cost; 2,296,089 shares at June 30, 2023 and December 31, 2022		(122.8)	(122.8)
Total equity		4,486	4,228.7
Total liabilities and equity		$ 33,104.7	$ 33,117.3
[1]During second quarter 2023, Assurant, Inc. initiated plans to sell its Miami, Florida property. As of June 30, 2023, the related assets totaling $44.4 million met held-for-sale criteria and were reclassified from property and equipment, net, to other assets. Assurant, Inc. has ceased depreciation of these assets which are recorded at carrying value, which is less than the estimated fair value less estimated costs to sell.

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Fixed maturity securities available for sale, amortized cost	$ 7,210.8	$ 6,920.8
Commercial mortgage loans on real estate, allowances for expected credit losses	3.1	1.8
Premiums and accounts receivable, allowances for expected credit losses	8.6	9.2
Reinsurance recoverables, allowances for expected credit losses	4.8	5.4
Other assets, allowances for credit losses	1.2	1.7
Accounts payable and other liabilities, allowances for credit losses	$ 10.5	$ 10.3
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	800,000,000	800,000,000
Common stock, shares, issued (in shares)	55,304,730	55,126,470
Common stock, shares outstanding (in shares)	53,008,641	52,830,381
Treasury stock, at cost (in shares)	2,296,089	2,296,089
Disposal Group, Held-for-sale, Not Discontinued Operations | Property In Miami, Florida
Held-for-sale property	$ 44.4

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues
Net earned premiums	$ 2,343	$ 2,168.9	$ 4,608.5	$ 4,305.3
Fees and other income	295.7	325.2	578.4	647.6
Net investment income	112.9	92	218.1	178.3
Net realized losses on investments (including $3.1, $1.6, $5.6, and $2.1 of impairment-related losses for the three and six months ended June 30, 2023 and 2022, respectively) and fair value changes to equity securities	(20)	(76.4)	(30.6)	(138.8)
Total revenues	2,731.6	2,509.7	5,374.4	4,992.4
Benefits, losses and expenses
Policyholder benefits	632.5	600	1,278.1	1,090
Underwriting, selling, general and administrative expenses	1,867.6	1,811.7	3,690.8	3,602.3
Interest expense	27.2	27.2	54.2	54.1
(Gain) loss on extinguishment of debt	0	0.9	(0.1)	0.9
Total benefits, losses and expenses	2,527.3	2,439.8	5,023	4,747.3
Income before income tax expense	204.3	69.9	351.4	245.1
Income tax expense	48	17.7	81.5	43.9
Net income	$ 156.3	$ 52.2	$ 269.9	$ 201.2
Earnings Per Common Share
Basic (in dollars per share)	$ 2.91	$ 0.96	$ 5.03	$ 3.65
Diluted (in dollars per share)	$ 2.90	$ 0.95	$ 5.01	$ 3.61
Share Data
Weighted average common shares outstanding used in basic per common share calculations (in shares)	53,745,611	54,607,321	53,619,711	55,190,104
Plus: Dilutive securities (in shares)	144,071	407,626	223,324	473,842
Weighted average common shares outstanding used in diluted per common share calculations (in shares)	53,889,682	55,014,947	53,843,035	55,663,946

Consolidated Statements of Op_2

Consolidated Statements of Operations (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Impairment gain (losses)	$ (3.1)	$ (1.6)	$ (5.6)	$ (2.1)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 156.3	$ 52.2	$ 269.9	$ 201.2
Other comprehensive income (loss):
Change in unrealized losses on securities, net of taxes of $9.7, $77.5, $(11.1) and $162.8 for the three and six months ended June 30, 2023 and 2022, respectively	(46.9)	(291.9)	32.3	(626.7)
Change in unrealized gains on derivative transactions, net of taxes of $(0.6), $0.2, $(0.6) and $0.4 for the three and six months ended June 30, 2023 and 2022, respectively	2.1	(0.7)	2.2	(1.3)
Change in foreign currency translation, net of taxes of $(4.4), $1.0, $(2.1) and $(2.6) for the three and six months ended June 30, 2023 and 2022, respectively	23.7	(41.9)	33.7	(40.6)
Change in pension and postretirement unrecognized net periodic benefit cost, net of taxes of $0.6, $0.6, $1.3 and $0.9 for the three and six months ended June 30, 2023 and 2022, respectively	(2.1)	(2.4)	(4.7)	(3.6)
Total other comprehensive income (loss)	(23.2)	(336.9)	63.5	(672.2)
Total comprehensive income (loss)	$ 133.1	$ (284.7)	$ 333.4	$ (471)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Change in unrealized gains on securities, tax	$ 9.7	$ 77.5	$ (11.1)	$ 162.8
Change in unrealized gains on derivative transactions, tax	(0.6)	0.2	(0.6)	0.4
Change in foreign currency transaction, tax	(4.4)	1	(2.1)	(2.6)
Change in pension and postretirement unrecognized net periodic benefit cost, tax	$ 0.6	$ 0.6	$ 1.3	$ 0.9

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2021	$ 5,464.1	$ 0.7	$ 1,695	$ 4,041.2	$ (150)	$ (122.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	7.8		7.8
Stock plan compensation expense	29.3		29.3
Common stock dividends	(76)			(76)
Acquisition of common stock	(494.5)	(0.1)	(102.2)	(392.2)		0
Net income	201.2			201.2
Other comprehensive income (loss)	(672.2)				(672.2)
Ending balance at Jun. 30, 2022	4,459.7	0.6	1,629.9	3,774.2	(822.2)	(122.8)
Beginning balance at Mar. 31, 2022	4,999	0.6	1,652.1	3,954.4	(485.3)	(122.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan compensation expense	16.9		16.9
Common stock dividends	(38.6)			(38.6)
Acquisition of common stock	(232.9)	0	(39.1)	(193.8)
Net income	52.2			52.2
Other comprehensive income (loss)	(336.9)				(336.9)
Ending balance at Jun. 30, 2022	4,459.7	0.6	1,629.9	3,774.2	(822.2)	(122.8)
Beginning balance at Dec. 31, 2022	4,228.7	0.6	1,637.8	3,699.3	(986.2)	(122.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	7.4		7.4
Stock plan compensation expense	29.7		29.7
Common stock dividends	(76.7)			(76.7)
Acquisition of common stock	(36.5)	0	(21.2)	(15.3)
Net income	269.9			269.9
Other comprehensive income (loss)	63.5				63.5
Ending balance at Jun. 30, 2023	4,486	0.6	1,653.7	3,877.2	(922.7)	(122.8)
Beginning balance at Mar. 31, 2023	4,396.4	0.6	1,642.2	3,775.9	(899.5)	(122.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan compensation expense	17.2		17.2
Common stock dividends	(39.7)			(39.7)
Acquisition of common stock	(21)		(5.7)	(15.3)
Net income	156.3			156.3
Other comprehensive income (loss)	(23.2)				(23.2)
Ending balance at Jun. 30, 2023	$ 4,486	$ 0.6	$ 1,653.7	$ 3,877.2	$ (922.7)	$ (122.8)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Stockholders' Equity [Abstract]
Common stock dividends (usd per share)	$ 0.70	$ 0.68	$ 1.40	$ 1.36

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Statement of Cash Flows [Abstract]
Net income	$ 269.9	$ 201.2
Noncash revenues, expenses, gains and losses included in net income from operations:
Deferred tax (benefit) expense	(23.5)	14.2
Depreciation and amortization	95.3	95.4
Net realized losses on investments, including impairment losses	30.6	138.8
Loss (gain) on extinguishment of debt	(0.1)	0.9
Stock based compensation expense	29.7	29.3
Restructuring costs	5.1	0
Changes in operating assets and liabilities:
Insurance policy reserves and expenses	(134.4)	527.1
Premiums and accounts receivable	67.2	(444.5)
Commissions payable	(21.6)	(40.6)
Reinsurance recoverable	392.1	77
Reinsurance balance payable	(15.6)	18.5
Funds withheld under reinsurance	9	(24.9)
Deferred acquisition costs and value of business acquired	(16.3)	(352)
Taxes receivable	(21.7)	(68.3)
Other assets and other liabilities	(200.2)	(459.8)
Other	(20.5)	(40.4)
Net cash provided by (used in) operating activities	445	(328.1)
Sales of:
Fixed maturity securities available for sale	563.8	1,712.6
Equity securities	10.9	40.3
Other invested assets	13.9	93
Subsidiary, net of cash transferred	0	4.8
Maturities, calls, prepayments, and scheduled redemption of:
Fixed maturity securities available for sale	123.9	297.8
Commercial mortgage loans on real estate	13.4	23.1
Purchases of:
Fixed maturity securities available for sale	(954.3)	(1,903.1)
Equity securities	(2.7)	(27)
Commercial mortgage loans on real estate	(21.8)	(59.9)
Other invested assets	(20)	(58.6)
Property and equipment and other	(97.8)	(87.3)
Subsidiaries, net of cash transferred	(0.3)	0
Change in short-term investments	(113.3)	70.6
Other	0.5	0.7
Net cash (used in) provided by investing activities	(483.8)	107
Financing activities
Issuance of debt, net of issuance costs	173.2	0
Repayment of debt	(175)	(75.9)
Payment of contingent liability	(2.5)	0
Acquisition of common stock	(17.8)	(466.6)
Common stock dividends paid	(76.7)	(76)
Employee stock purchases and withholdings	(1.6)	(6.4)
Net cash used in financing activities	(100.4)	(624.9)
Effect of exchange rate changes on cash and cash equivalents	4.2	(26.8)
Change in cash and cash equivalents	(135)	(872.8)
Cash and cash equivalents at beginning of period	1,536.7	2,054.8
Cash and cash equivalents at end of period	$ 1,401.7	$ 1,182

Nature of Operations

Nature of Operations	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Assurant, Inc. (the “Company”) is a leading global business services company that supports, protects and connects major consumer purchases. The Company supports the advancement of the connected world by partnering with the world’s leading brands to develop innovative solutions and to deliver an enhanced customer experience. The Company operates in North America, Latin America, Europe and Asia Pacific through two operating segments: Global Lifestyle and Global Housing. Through its Global Lifestyle segment, the Company provides mobile device solutions, extended service products and related services for consumer electronics and appliances, and credit and other insurance products (referred to as “Connected Living”); and vehicle protection, leased and financed solutions and other related services (referred to as “Global Automotive”). Through its Global Housing segment, the Company provides lender-placed and voluntary homeowners insurance and manufactured housing insurance, and lender-placed flood insurance (referred to as “Homeowners”); and renters insurance and related and other products (referred to as “Renters and Other”). The Company’s common stock is traded on the New York Stock Exchange under the symbol “AIZ”.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. The consolidated balance sheet as of June 30, 2023, the consolidated statements of operations, consolidated statements of comprehensive income and consolidated statements of changes in equity for the three and six months ended June 30, 2023 and 2022 and the consolidated statements of cash flows for the six months ended June 30, 2023 and 2022 are unaudited. In the opinion of management, the interim data includes all adjustments necessary for a fair statement of the results for the interim periods. The unaudited interim consolidated financial statements include the accounts of the Company and all of its wholly owned subsidiaries. All inter-company transactions and balances are eliminated in consolidation. Certain prior period amounts have been revised to conform to the current period presentation, including the changes to the composition of the reportable segments described in Note 4 and changes in future policy benefits and expenses and reinsurance recoverables from the modified retrospective application of the new accounting pronouncement targeted improvements to long duration contracts as described in Notes 3 and 9.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Changes to GAAP are established by the Financial Accounting Standards Board (“FASB”) in the form of Accounting Standards Updates (“ASUs”) to the FASB Accounting Standards Codification. The Company considers the applicability and impact of all ASUs. The following table provides a description of ASUs recently issued by the FASB and the impact of their adoption on the Company’s consolidated financial statements. Adopted The table below describes the impacts of the ASUs adopted by the Company, effective January 1, 2023: Standard Summary of the Standard Effective date Impact of the Standard on the Company’s Financial Statements ASU 2018-12, Financial Services—Insurance The guidance includes the following primary In December 2022, the FASB issued guidance to provide entities an accounting policy election to not apply the accounting guidance to contracts or legal entities sold and derecognized before the effective date when the entity has no significant continuing involvement with them. The election may be applied on a transaction-by-transaction basis. January 1, 2023, to be applied retrospectively or modified retrospectively to January 1, 2021 The Company adopted this standard as of January 1, 2023 using the modified retrospective method on liabilities for future policy benefits and expenses to January 1, 2021 for long-term care insurance contracts that have been fully reinsured. The Company also adopted the amended guidance in ASU 2022-05 and elected to not apply the amended accounting guidance to long duration contracts of legal entities sold and derecognized before the January 1, 2023 effective date as the Company has no significant continuing involvement with them. The adoption of this standard along with the amended guidance on transition has no impact on equity or net income on the long-term care contracts as they are fully reinsured with third party reinsurers. However, disclosure along with a roll-forward table on a gross basis on the long-term care business is presented in Note 9. ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers The guidance improves comparability after a business combination is reported in the acquirer’s financial statements by providing consistent recognition and measurement guidance for revenue contracts with customers acquired in a business combination and revenue contracts with customers not acquired in a business combination. Generally, the acquirer will recognize the acquired contract assets and contract liabilities at the same amounts recorded by the acquiree. Historically, such amounts were recognized by the acquirer at fair value in the acquisition accounting. Under the amended guidance, the acquirer should account for the acquired revenue contracts as if it had originated the contracts. The amendments provide certain practical expedients for acquirers when recognizing and measuring acquired contract assets and contract liabilities from revenue contracts in a business combination. January 1, 2023, to be applied prospectively (with early adoption permitted). The Company adopted this standard from January 1, 2023. The amendments will be applied to business combinations occurring on or after the effective date of the amendments. Not Yet Adopted

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Segment Information	Segment Information As of June 30, 2023, the Company had three reportable segments: Global Lifestyle, Global Housing and Corporate and Other. The Company defines Adjusted EBITDA, the segment measure of profitability, as net income, excluding net realized gains (losses) on investments and fair value changes to equity securities, non-core operations (defined below), restructuring costs related to strategic exit activities (outside of normal periodic restructuring and cost management activities), Assurant Health runoff operations (described below), interest expense, provision (benefit) for income taxes, depreciation expense, amortization of purchased intangible assets, as well as other highly variable or unusual items. Effective January 1, 2023, the Company realigned the composition of its reportable segments to correspond with changes to its operating structure. As a result, the Global Housing segment is now comprised of two key lines of business: Homeowners, and Renters and Other. Certain specialty products, mainly the leased and financed business, previously reported in the Global Housing segment are now reported in Global Lifestyle to better align with the Company’s go-to-market strategy. This realignment had no impact on the Company’s consolidated results. The following table presents segment Adjusted EBITDA with a reconciliation to net income: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Adjusted EBITDA by segment: Global Lifestyle $ 197.0 $ 221.0 $ 395.9 $ 447.7 Global Housing 154.6 61.0 223.0 165.4 Corporate and Other (28.5) (24.9) (52.9) (47.1) Reconciling items to consolidated net income: Interest expense (27.2) (27.2) (54.2) (54.1) Depreciation expense (25.4) (21.8) (51.8) (42.1) Amortization of purchased intangible assets (18.7) (17.0) (37.4) (34.6) Net realized losses on investments and fair value changes to equity securities (20.0) (76.4) (30.6) (138.8) Non-core operations (1) (30.2) (36.7) (42.4) (42.2) Restructuring costs 1.3 (0.2) (5.1) (0.2) Assurant Health runoff operations (2) — (0.5) 7.5 (0.5) Other adjustments 1.4 (7.4) (0.6) (8.4) Total reconciling items (118.8) (187.2) (214.6) (320.9) Income before income tax expense 204.3 69.9 351.4 245.1 Income tax expense 48.0 17.7 81.5 43.9 Net income $ 156.3 $ 52.2 $ 269.9 $ 201.2 (1) Consists of certain businesses which the Company has fully exited or expects to fully exit, including the long-tail commercial liability businesses (sharing economy and small commercial businesses), as well as certain legacy long-duration insurance policies (collectively referred to as “non-core operations”). The non-core operations do not qualify as held for sale or discontinued operations under GAAP accounting guidance and are presented as a reconciling item to consolidated net income. (2) In first quarter 2023, the Company recorded income of $7.5 million related to a payment it received from Time Insurance Company (“TIC”) pursuant to a participation agreement that the Company had with TIC in connection with its sale by the Company in 2018. The payment related to the Company’s prior participation in the risk adjustment program introduced by the Patient Protection and Affordable Care Act of 2010. The Company’s net earned premiums, fees and other income by segment and product are as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Global Lifestyle: Connected Living $ 1,079.2 $ 1,070.2 $ 2,105.8 $ 2,147.6 Global Automotive 1,029.7 942.4 2,043.4 1,853.6 Total $ 2,108.9 $ 2,012.6 $ 4,149.2 $ 4,001.2 Global Housing: Homeowners $ 412.3 $ 344.1 $ 803.7 $ 681.5 Renters and Other 124.3 122.3 238.2 242.2 Total $ 536.6 $ 466.4 $ 1,041.9 $ 923.7 The following table presents total assets by segment: June 30, 2023 December 31, 2022 Global Lifestyle (1) $ 27,227.4 $ 27,404.1 Global Housing (1) 4,414.1 4,382.6 Corporate and Other (2) 1,463.2 1,330.6 Segment assets $ 33,104.7 $ 33,117.3 (1) Segment assets for Global Lifestyle and Global Housing do not include net unrealized gains (losses) on securities attributable to those segments, which are all included within Corporate and Other.

Contract Revenues

Contract Revenues	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Contract Revenues	Contract Revenues The Company partners with clients to provide consumers with a diverse range of protection products and services. The Company’s revenues from protection products are accounted for as insurance contracts and are recognized over the term of the insurance protection provided. Revenues from service contracts and sales of products are recognized as the contractual performance obligations are satisfied or the products are delivered. Revenue is measured as the amount of consideration the Company expects to be entitled to in exchange for performing the services or transferring products. If payments are received before the related revenue is recognized, the amount is recorded as unearned revenue or advance payment liabilities, until the performance obligations are satisfied or the products are transferred. The disaggregated revenues from service contracts included in fees and other income on the consolidated statements of operations are $254.7 million and $290.3 million for Global Lifestyle and $20.9 million and $21.2 million for Global Housing for the three months ended June 30, 2023 and 2022, respectively. The disaggregated revenues from service contracts included in fees and other income on the consolidated statement of operations are $501.9 million and $568.3 million for Global Lifestyle and $40.8 million and $43.2 million for Global Housing for the six months ended June 30, 2023 and 2022, respectively. Global Lifestyle In the Global Lifestyle segment, revenues from service contracts and sales of products are primarily from the Connected Living business. Through partnerships with mobile carriers, the Company provides administrative services related to its mobile device protection products, including program design and marketing strategy, risk management, data analytics, customer support and claims handling, supply chain and service delivery, repair and logistics, and device disposition. Administrative fees are generally billed monthly based on the volume of services provided during the billing period (for example, based on the number of mobile subscribers) with payment due within a short-term period. Each service or bundle of services, depending on the contract, is an individual performance obligation with a standalone selling price. The Company recognizes revenue as it invoices, which corresponds to the value transferred to the customer. The Company also repairs, refurbishes and then sells mobile and other electronic devices, on behalf of its clients, for a bundled per unit fee. The entire processing of the device is considered one performance obligation with a standalone selling price and thus, the per unit fee is recognized when the products are sold. Payments are generally due prior to shipment or within a short-term period. Global Housing In the Global Housing segment, revenues from service contracts and sales of products are primarily from the Homeowners business. As part of the Homeowners business, the Company provides loan and claim payment tracking services for lenders. The Company generally invoices its customers weekly or monthly based on the volume of services provided during the billing period with payment due within a short-term period. Each service is an individual performance obligation with a standalone selling price. The Company recognizes revenue as it invoices, which corresponds to the value transferred to the customer. Contract Balances The receivables and unearned revenue under these contracts were $262.5 million and $167.7 million, respectively, as of June 30, 2023, and $271.7 million and $171.1 million, respectively, as of December 31, 2022. These balances are included in premiums and accounts receivable and accounts payable and other liabilities, respectively, in the consolidated balance sheets. Revenue from service contracts and sales of products recognized during the three months ended June 30, 2023 and 2022 that was included in unearned revenue as of December 31, 2022 and 2021 was $20.6 million and $26.4 million, respectively. Revenue from service contracts and sales of products recognized during the six months ended June 30, 2023 and 2022 that was included in unearned revenue as of December 31, 2022 and 2021 was $42.5 million and $49.0 million, respectively. In certain circumstances, the Company defers upfront commissions and other costs in connection with client contracts in excess of one year where the Company can demonstrate future economic benefit. For these contracts, expense is recognized as revenues are earned. The Company periodically assesses recoverability based on the performance of the related contracts. As of June 30, 2023 and December 31, 2022, the Company had approximately $54.9 million and $61.4 million, respectively, of such intangible assets attributed to service contracts that will be expensed over the term of the client contracts.

Investments

Investments	6 Months Ended
	Jun. 30, 2023
Investments [Abstract]
Investments	Investments The following tables show the cost or amortized cost, allowance for credit losses, gross unrealized gains and losses, and fair value of the Company’s fixed maturity securities as of the dates indicated: June 30, 2023 Cost or Allowance for Credit Losses Gross Gross Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 72.9 $ — $ 0.2 $ (5.7) $ 67.4 States, municipalities and political subdivisions 141.9 — 0.5 (13.5) 128.9 Foreign governments 458.4 — 4.1 (17.3) 445.2 Asset-backed 843.1 — 2.9 (34.1) 811.9 Commercial mortgage-backed 407.8 — 0.1 (57.5) 350.4 Residential mortgage-backed 519.7 — 0.4 (55.7) 464.4 U.S. corporate 3,332.2 — 13.7 (298.4) 3,047.5 Foreign corporate 1,434.8 — 5.2 (137.9) 1,302.1 Total fixed maturity securities $ 7,210.8 $ — $ 27.1 $ (620.1) $ 6,617.8 December 31, 2022 Cost or Allowance for Credit Losses Gross Gross Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 92.9 $ — $ 0.2 $ (6.7) $ 86.4 States, municipalities and political subdivisions 152.4 — 1.1 (16.0) 137.5 Foreign governments 416.2 — 0.6 (20.5) 396.3 Asset-backed 735.1 — 1.4 (40.2) 696.3 Commercial mortgage-backed 458.6 — 0.2 (56.5) 402.3 Residential mortgage-backed 492.7 — 0.4 (55.1) 438.0 U.S. corporate 3,265.1 — 13.9 (317.9) 2,961.1 Foreign corporate 1,307.8 — 3.4 (145.4) 1,165.8 Total fixed maturity securities $ 6,920.8 $ — $ 21.2 $ (658.3) $ 6,283.7 The cost or amortized cost and fair value of fixed maturity securities as of June 30, 2023 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties. Cost or Fair Value Due in one year or less $ 194.5 $ 192.8 Due after one year through five years 1,751.7 1,667.8 Due after five years through ten years 2,461.0 2,256.6 Due after ten years 1,033.0 873.9 Total 5,440.2 4,991.1 Asset-backed 843.1 811.9 Commercial mortgage-backed 407.8 350.4 Residential mortgage-backed 519.7 464.4 Total $ 7,210.8 $ 6,617.8 The following table sets forth the net realized gains (losses) on investments and fair value changes to equity securities, including impairments, recognized in the consolidated statements of operations for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities: Fixed maturity securities $ (7.8) $ (22.6) $ (11.8) $ (41.1) Equity securities (1) (9.8) (54.0) (12.9) (97.2) Commercial mortgage loans on real estate 0.2 — (1.3) 0.2 Other investments 0.5 1.8 1.0 1.4 Total net realized losses on investments related to sales and other and fair value changes to equity securities (16.9) (74.8) (25.0) (136.7) Net realized losses related to impairments: Fixed maturity securities (2.1) (1.6) (2.1) (1.6) Other investments (1.0) — (3.5) (0.5) Total net realized losses related to impairments (3.1) (1.6) (5.6) (2.1) Total net realized losses on investments and fair value changes to equity securities $ (20.0) $ (76.4) $ (30.6) $ (138.8) (1) Upward adjustments of $0.4 million, $0.4 million, $9.5 million and $19.5 million for the three and six months ended June 30, 2023 and 2022 and impairments of $1.0 million, $3.5 million, $0.0 million and $0.0 million for the three and six months ended June 30, 2023 and 2022, respectively, were realized on equity investments accounted for under the measurement alternative. The following table sets forth the portion of fair value changes to equity securities held for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Net losses recognized on equity securities $ (9.8) $ (54.0) $ (12.9) $ (97.2) Less: Net realized (losses) gains related to sales of equity securities (1.5) 8.4 (2.3) 20.2 Total fair value changes to equity securities held (1) $ (8.3) $ (62.4) $ (10.6) $ (117.4) (1) Three and six months ended June 30, 2023 and 2022 included $2.2 million, $4.5 million, $44.2 million and $77.9 million of net losses from four equity positions that went public during 2021. The total fair value of these investments as of June 30, 2023 was $5.1 million, included in equity securities on the consolidated balance sheet. Equity investments accounted for under the measurement alternative are included within other investments on the consolidated balance sheets. The following table summarizes information related to these investments: June 30, 2023 December 31, 2022 Initial cost $ 82.1 $ 81.7 Cumulative upward adjustments 51.2 50.8 Cumulative downward adjustments (including impairments) (8.4) (5.0) Carrying value $ 124.9 $ 127.5 The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of June 30, 2023 and December 31, 2022 were as follows: June 30, 2023 Less than 12 months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Fixed maturity securities: U.S. government and government agencies and authorities $ 19.9 $ (0.4) $ 44.1 $ (5.3) $ 64.0 $ (5.7) States, municipalities and political subdivisions 37.7 (2.0) 64.8 (11.5) 102.5 (13.5) Foreign governments 95.3 (2.1) 213.9 (15.2) 309.2 (17.3) Asset-backed 156.9 (7.3) 435.9 (26.8) 592.8 (34.1) Commercial mortgage-backed 96.4 (9.7) 248.6 (47.8) 345.0 (57.5) Residential mortgage-backed 200.7 (9.4) 233.7 (46.3) 434.4 (55.7) U.S. corporate 1,292.9 (49.4) 1,398.8 (249.0) 2,691.7 (298.4) Foreign corporate 424.8 (13.9) 775.3 (124.0) 1,200.1 (137.9) Total fixed maturity securities $ 2,324.6 $ (94.2) $ 3,415.1 $ (525.9) $ 5,739.7 $ (620.1) December 31, 2022 Less than 12 months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Fixed maturity securities: U.S. government and government agencies and authorities $ 58.5 $ (2.9) $ 24.6 $ (3.8) $ 83.1 $ (6.7) States, municipalities and political subdivisions 77.4 (7.8) 34.5 (8.2) 111.9 (16.0) Foreign governments 268.5 (12.1) 92.7 (8.4) 361.2 (20.5) Asset-backed 378.2 (22.0) 218.5 (18.2) 596.7 (40.2) Commercial mortgage-backed 290.7 (33.2) 109.3 (23.3) 400.0 (56.5) Residential mortgage-backed 371.3 (31.7) 58.6 (23.4) 429.9 (55.1) U.S. corporate 2,266.6 (206.3) 370.3 (111.6) 2,636.9 (317.9) Foreign corporate 843.9 (79.0) 251.8 (66.4) 1,095.7 (145.4) Total fixed maturity securities $ 4,555.1 $ (395.0) $ 1,160.3 $ (263.3) $ 5,715.4 $ (658.3) Total gross unrealized losses represented approximately 11% and 12% of the aggregate fair value of the related securities as of June 30, 2023 and December 31, 2022, respectively. Approximately 15% and 60% of these gross unrealized losses had been in a continuous loss position for less than twelve months as of June 30, 2023 and December 31, 2022, respectively. The total gross unrealized losses are comprised of 3,880 and 3,826 individual securities as of June 30, 2023 and December 31, 2022, respectively. In accordance with its policy, the Company concluded that for these securities, the gross unrealized losses as of June 30, 2023 and December 31, 2022 were related to non-credit factors and therefore, did not recognize credit-related losses during the three and six months ended June 30, 2023. Additionally, the Company currently does not intend to and is not required to sell these investments prior to an anticipated recovery in value. The Company has entered into commercial mortgage loans, collateralized by the underlying real estate, on properties located throughout the U.S. As of June 30, 2023, approximately 35% of the outstanding principal balance of commercial mortgage loans was concentrated in the states of Texas, California and Maryland. Although the Company has a diversified loan portfolio, an economic downturn could have an adverse impact on the ability of its debtors to repay their loans. The outstanding balance of commercial mortgage loans range in size from less than $0.1 million to $9.7 million as of June 30, 2023 and from $0.1 million to $9.7 million as of December 31, 2022. Credit quality indicators for commercial mortgage loans are loan-to-value and debt-service coverage ratios. The loan-to-value ratio compares the principal amount of the loan to the fair value of the underlying property collateralizing the loan, and is commonly expressed as a percentage. The debt-service coverage ratio compares a property’s annual net operating income to its annual debt-service payments and is commonly expressed as a ratio. The loan-to-value and debt-service coverage ratios are generally updated annually in the fourth quarter. The following table presents the amortized cost basis of commercial mortgage loans, excluding the allowance for credit losses, by origination year for certain key credit quality indicators at June 30, 2023 and December 31, 2022. June 30, 2023 Origination Year 2023 2022 2021 2020 2019 Prior Total % of Total Loan to value 70% and less $ 17.6 $ 47.5 $ 43.0 $ — $ — $ 70.6 $ 178.7 58.4 % 71% to 80% 2.5 29.6 68.2 2.8 — 4.5 107.6 35.2 % 81% to 95% — — 17.7 — — 1.8 19.5 6.4 % Greater than 95% — — — — — — — — % Total $ 20.1 $ 77.1 $ 128.9 $ 2.8 $ — $ 76.9 $ 305.8 100.0 % June 30, 2023 Origination Year 2023 2022 2021 2020 2019 Prior Total % of Total Debt-service coverage ratios (2): Greater than 2.0 $ — $ 24.9 $ 11.6 $ — $ — $ 48.0 $ 84.5 27.6 % 1.5 to 2.0 13.9 26.5 11.5 — — 10.8 62.7 20.5 % 1.0 to 1.5 6.2 25.7 56.1 — — 12.9 100.9 33.0 % Less than 1.0 — — 49.7 2.8 — 5.2 57.7 18.9 % Total $ 20.1 $ 77.1 $ 128.9 $ 2.8 $ — $ 76.9 $ 305.8 100.0 % December 31, 2022 Origination Year 2022 2021 2020 2019 2018 Prior Total % of Total Loan to value 70% and less $ 44.0 $ 45.1 $ — $ — $ — $ 76.0 $ 165.1 55.5 % 71% to 80% 32.7 75.7 2.7 — 4.6 — 115.7 38.9 % 81% to 95% — 14.7 — — — — 14.7 5.0 % Greater than 95% — — — — — 1.9 1.9 0.6 % Total $ 76.7 $ 135.5 $ 2.7 $ — $ 4.6 $ 77.9 $ 297.4 100.0 % December 31, 2022 Origination Year 2022 2021 2020 2019 2018 Prior Total % of Total Debt-service coverage ratios (2): Greater than 2.0 $ 24.2 $ 11.7 $ — $ — $ — $ 50.8 $ 86.7 29.2 % 1.5 to 2.0 26.8 11.6 — — 4.6 6.6 49.6 16.7 % 1.0 to 1.5 25.7 63.0 — — — 13.7 102.4 34.4 % Less than 1.0 — 49.2 2.7 — — 6.8 58.7 19.7 % Total $ 76.7 $ 135.5 $ 2.7 $ — $ 4.6 $ 77.9 $ 297.4 100.0 % (1) Loan-to-value ratio derived from current principal amount of the loan divided by the fair value of the property. The fair value of the underlying commercial properties is updated at least annually.

Fair Value Disclosures

Fair Value Disclosures	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures Fair Values, Inputs and Valuation Techniques for Financial Assets and Liabilities Disclosures The fair value measurements and disclosures guidance defines fair value and establishes a framework for measuring fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company has categorized its recurring fair value basis financial assets and liabilities into a three-level fair value hierarchy based on the priority of the inputs to the valuation technique. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and takes into account factors specific to the asset or liability. The levels of the fair value hierarchy are described below: • Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company can access. • Level 2 inputs utilize other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active and inputs other than quoted prices that are observable in the marketplace for the asset or liability. The observable inputs are used in valuation models to calculate the fair value for the asset or liability. • Level 3 inputs are unobservable but are significant to the fair value measurement for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. These inputs reflect management’s own assumptions about the assumptions a market participant would use in pricing the asset or liability. The Company reviews fair value hierarchy classifications on a quarterly basis. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy. The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of June 30, 2023 and December 31, 2022. The amounts presented below for short-term investments, other investments, cash equivalents, other assets, assets held in and liabilities related to separate accounts and other liabilities differ from the amounts presented in the consolidated balance sheets because only certain investments or certain assets and liabilities within these line items are measured at estimated fair value. Other investments are comprised of investments in the Assurant Investment Plan (“AIP”), the American Security Insurance Company Investment Plan, the Assurant Deferred Compensation Plan and other derivatives. Other liabilities are comprised of investments in the AIP, contingent considerations related to business combinations and other derivatives. The fair value amount and the majority of the associated levels presented for other investments and assets and liabilities held in separate accounts are received directly from third parties. June 30, 2023 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 67.4 $ — $ 67.4 $ — States, municipalities and political subdivisions 128.9 — 128.9 — Foreign governments 445.2 — 445.2 — Asset-backed 811.9 — 733.1 78.8 Commercial mortgage-backed 350.4 — 350.4 — Residential mortgage-backed 464.4 — 464.4 — U.S. corporate 3,047.5 — 3,011.7 35.8 Foreign corporate 1,302.1 — 1,294.4 7.7 Equity securities: Mutual funds 33.1 33.1 — — Common stocks 19.4 18.7 0.7 — Non-redeemable preferred stocks 207.1 — 207.1 — Short-term investments 230.8 170.2 (2) 60.6 (3) — Other investments 66.9 66.7 (1) — 0.2 (4) Cash equivalents 755.7 735.2 (2) 20.5 (3) — Other assets 2.9 — 2.9 (4) — Assets held in separate accounts 10.6 8.0 (1) 2.6 (3) — Total financial assets $ 7,944.3 $ 1,031.9 $ 6,789.9 $ 122.5 Financial Liabilities Other liabilities $ 66.7 $ 66.7 (1) $ — $ — Liabilities related to separate accounts 10.6 8.0 (1) 2.6 (3) — Total financial liabilities $ 77.3 $ 74.7 $ 2.6 $ — December 31, 2022 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 86.4 $ — $ 86.4 $ — States, municipalities and political subdivisions 137.5 — 137.5 — Foreign governments 396.3 — 396.3 — Asset-backed 696.3 — 635.9 60.4 Commercial mortgage-backed 402.3 — 402.3 — Residential mortgage-backed 438.0 — 438.0 — U.S. corporate 2,961.1 — 2,932.3 28.8 Foreign corporate 1,165.8 — 1,158.4 7.4 Equity securities: Mutual funds 32.7 32.7 — — Common stocks 23.9 23.2 0.7 — Non-redeemable preferred stocks 224.7 — 224.7 — Short-term investments 119.9 72.2 (2) 47.7 (3) — Other investments 60.3 60.1 (1) — 0.2 (4) Cash equivalents 789.1 647.3 (2) 141.8 (3) — Assets held in separate accounts 10.1 4.8 (1) 5.3 (3) — Total financial assets $ 7,544.4 $ 840.3 $ 6,607.3 $ 96.8 Financial Liabilities Other liabilities $ 75.3 $ 60.1 (1) $ 0.2 (4) $ 15.0 (5) Liabilities related to separate accounts 10.1 4.8 (1) 5.3 (3) — Total financial liabilities $ 85.4 $ 64.9 $ 5.5 $ 15.0 (1) Primarily includes mutual funds and related obligations. (2) Primarily includes money market funds. (3) Primarily includes fixed maturity securities and related obligations. (4) Primarily includes derivatives. (5) Includes contingent consideration liabilities. The following tables disclose the carrying value, fair value and hierarchy level of the financial instruments that are not recognized or are not carried at fair value in the consolidated balance sheets as of the dates indicated: June 30, 2023 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 302.7 $ 285.6 $ — $ — $ 285.6 Other investments 6.4 6.4 1.5 — 4.9 Other assets 16.0 16.0 — — 16.0 Total financial assets $ 325.1 $ 308.0 $ 1.5 $ — $ 306.5 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 7.5 $ 7.8 $ — $ — $ 7.8 Funds withheld under reinsurance 376.2 376.2 376.2 — — Debt 2,129.4 1,926.5 — 1,926.5 — Total financial liabilities $ 2,513.1 $ 2,310.5 $ 376.2 $ 1,926.5 $ 7.8 December 31, 2022 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 295.6 $ 278.2 $ — $ — $ 278.2 Other investments 6.7 6.7 1.6 — 5.1 Other assets 12.7 12.7 — — 12.7 Total financial assets $ 315.0 $ 297.6 $ 1.6 $ — $ 296.0 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 8.0 $ 8.4 $ — $ — $ 8.4 Funds withheld under reinsurance 366.6 366.6 366.6 — — Debt 2,129.9 1,932.7 — 1,932.7 — Total financial liabilities $ 2,504.5 $ 2,307.7 $ 366.6 $ 1,932.7 $ 8.4

Deferred Acquisition Costs

Deferred Acquisition Costs	6 Months Ended
	Jun. 30, 2023
Deferred Policy Acquisition Costs Disclosures [Abstract]
Deferred Acquisition Costs	Deferred Acquisition Costs The following table discloses information about deferred acquisition costs as of the dates indicated: For the Three Months Ended June 30, For the Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 9,683.0 $ 9,025.4 $ 9,677.1 $ 8,811.0 Costs deferred 1,168.9 1,233.6 2,159.2 2,337.5 Amortization (1,033.4) (900.0) (2,017.8) (1,789.5) Ending balance $ 9,818.5 $ 9,359.0 $ 9,818.5 $ 9,359.0

Reserves

Reserves	6 Months Ended
	Jun. 30, 2023
Insurance Loss Reserves [Abstract]
Reserves	Reserves Reserve Roll Forward The following table provides a roll forward of the Company’s beginning and ending claims and benefits payable balances. Claims and benefits payable is the liability for unpaid loss and loss adjustment expenses and is comprised of case and incurred but not reported (“IBNR”) reserves. Since unpaid loss and loss adjustment expenses are estimates, the Company’s actual losses incurred may be more or less than the Company’s previously developed estimates, which is referred to as either unfavorable or favorable development, respectively. The best estimate of ultimate loss and loss adjustment expense is generally selected from a blend of methods that are applied consistently each period. There have been no significant changes in the methodologies and assumptions utilized in estimating the liability for unpaid loss and loss adjustment expenses for any of the periods presented. For the Six Months Ended June 30, 2023 2022 Claims and benefits payable, at beginning of period $ 2,210.0 $ 1,523.0 Less: Reinsurance ceded and other (1,228.8) (744.1) Net claims and benefits payable, at beginning of period 981.2 778.9 Incurred losses and loss adjustment expenses related to: Current year 1,293.1 1,070.3 Prior years (15.0) 19.7 Total incurred losses and loss adjustment expenses 1,278.1 1,090.0 Paid losses and loss adjustment expenses related to: Current year 708.4 631.6 Prior years 438.6 383.5 Total paid losses and loss adjustment expenses 1,147.0 1,015.1 Net claims and benefits payable, at end of period 1,112.3 853.8 Plus: Reinsurance ceded and other (1) 908.0 600.8 Claims and benefits payable, at end of period (1) $ 2,020.3 $ 1,454.6 (1) Includes reinsurance recoverables and claims and benefits payable of $124.1 million and $56.0 million as of June 30, 2023 and 2022, respectively, which was ceded to the U.S. government. The Company acts as an administrator for the U.S. government under the voluntary National Flood Insurance Program. The Company experienced net favorable loss development of $15.0 million for the six months ended June 30, 2023 and net unfavorable loss development of $19.7 million for the six months ended June 30, 2022, as presented in the roll forward table above. Global Lifestyle contributed $21.5 million and $43.5 million in net favorable loss development for the six months ended June 30, 2023 and 2022, respectively. The net favorable loss development in both periods was attributable to nearly all lines of business in Global Lifestyle across most of the Company’s regions with a concentration on more recent accident years and based on emerging evaluations regarding loss experience. Positive trends in frequency and severity drove the significant favorable development in Global Automotive in 2022, but development was flat in 2023 due to inflationary impacts on parts and labor costs. Many of these contracts and products contain retrospective commission (profit sharing) provisions that would result in offsetting increases or decreases in expense dependent on if the development was favorable or unfavorable. Global Housing contributed $22.3 million of net favorable loss development for the six months ended June 30, 2023 and $15.2 million of net unfavorable loss development for the six months ended June 30, 2022. The net favorable loss development for the six months ended June 30, 2023 consisted of favorable non-catastrophe development of $32.3 million, partially offset by unfavorable development from prior catastrophe events of $10.0 million. The favorable non-catastrophe development was driven by $26.8 million from lender-placed hazard primarily in accident year 2022 due to favorable frequency and severity trends from lower than anticipated inflation. The unfavorable development primarily consisted of $8.0 million related to Winter Storm Elliott (which occurred in late December 2022) as a result of higher severity than initially projected. The net unfavorable loss development for the six months ended June 30, 2022 was attributable primarily to Tropical Storm Eta from accident year 2020, where the loss development pattern had been longer than typical and the average claim severities were higher than expected. The sharing economy and small commercial lines of business, reported within non-core operations, contributed $30.0 million and $48.8 million in net unfavorable loss development during the six months ended June 30, 2023 and 2022, respectively. The $30.0 million in net unfavorable loss development consisted of $30.9 million from sharing economy, driven by reserve increases related to higher frequency expectations for the number of claims closed with indemnity payment, partially offset by $0.9 million in favorable loss development from small commercial. In second quarter 2023, the Company entered into a retroactive reinsurance treaty to cover certain known losses and adverse development, up to a $50.0 million aggregate limit, relating to the small commercial business. As a result of the treaty, the Company recorded a $5.0 million loss for the three and six months ended June 30, 2023, which is included in fees and other income in the consolidated statements of operations. The net unfavorable loss development for the six months ended June 30, 2022 was attributable primarily to emerging adverse development trends on known claims in sharing economy, as well as reserve assumption revisions to reflect relevant industry benchmarks. All others contributed $1.2 million and $0.8 million of net favorable loss development for the six months ended June 30, 2023 and 2022 respectively. Long-Duration Contracts The Company adopted the targeted improvements accounting guidance for long-duration insurance contracts as of January 1, 2023, using a modified retrospective method on liabilities for future policy benefits and expenses to January 1, 2021 for long-term care insurance contracts that have been fully reinsured. The Company also elected to not apply the amended accounting guidance to long-duration contracts of legal entities sold and derecognized before the January 1, 2023 effective date as the Company has no significant continuing involvement with them. Under the transition guidance, the long-term care insurance contracts are grouped into cohorts based on the contract’s issue year. Premiums are recognized when due as net earned premiums in the consolidated statement of operations. A future policy benefits and expenses reserve is recorded as the present value of estimated future policy benefits and expenses less the present value of estimated future net premiums. The net premium ratio (“NPR”) approach is used to recognize a liability when expected insurance benefits are accrued over the life of the contract in proportion to premium revenue. Policy expense assumptions are locked in as of December 31, 2020 as the long-term care insurance products are in run-off as of the transition date. Actual premiums and benefits are recognized on a quarterly basis in the consolidated statement of operations allocated in proportion to prior period cash flow projections at the cohort level. The updated cash flows used in the calculation are discounted using the discount rate used in the last premium deficiency test update prior to December 31, 2020 (the “original discount rate”) and presented as interest expense in the consolidated statement of operations. The revised NPR is used to measure benefit expense based on the recognized premium revenue in the period. The difference between the updated future policy benefits and expenses reserve opening period and previous ending period due to updating the NPR is presented as a remeasurement gain or loss (e.g., a cumulative catch-up adjustment) in policyholder benefits in the Company’s consolidated statements of operations. A remeasurement of the ending reporting period future policy benefits and expenses reserve is calculated using the current upper medium grade fixed-income corporate bond instrument yield as of the consolidated balance sheet ending period (the “current discount rate”). The current discount rate used is an externally published US corporate A index weighted average spot rate that is updated quarterly and effectively matches the duration of the expected cash flow streams of the long-term care reserves. The difference between the ending period future policy benefits and expenses reserve measured using the original discount rate and the future policy benefits and expenses reserve measured using the current discount rate is recorded in accumulated other comprehensive income (“AOCI”) in the Company’s consolidated statements of comprehensive income. The long-term care insurance contracts are fully reinsured and there is no impact to consolidated stockholders’ equity or net income as the reserves are fully reinsured. The following table presents the balances and changes in the long-term care future policy benefits and expenses reserve: June 30, 2023 December 31, 2022 Present value of expected net premiums Balance, beginning of period $ 34.2 $ 37.1 Beginning balance at original discount rate 33.4 29.2 Effect of changes in cash flow assumptions (1) — 9.4 Effect of actual variances from expected experience 3.3 (2.7) Adjusted beginning of period balance 36.7 35.9 Experience variance (2) — (0.3) Interest accrual 0.9 4.6 Net premiums collected (1.6) (6.8) Ending balance at original discount rate 36.0 33.4 Effect of changes in discount rate assumptions 1.8 0.8 Balance, end of period $ 37.8 $ 34.2 Present value of expected future policy benefits Balance, beginning of period $ 462.4 $ 658.5 Beginning balance at original discount rate 444.4 430.0 Effect of changes in cash flow assumptions (1) — 12.3 Effect of actual variances from expected experience 4.3 (3.3) Adjusted beginning of period balance 448.7 439.0 Experience variance (2) (1.0) (1.2) Interest accrual 6.5 24.7 Benefit payments (5.1) (18.1) Ending balance at original discount rate 449.1 444.4 Effect of changes in discount rate assumptions 35.8 18.0 Balance, end of period $ 484.9 $ 462.4 Net future policy benefits and expenses $ 447.1 $ 428.2 Related reinsurance recoverable 447.1 428.2 Net future policy benefits and expenses, after reinsurance recoverable $ — $ — Weighted-average liability duration of the future policy benefits and expenses (in years) 12.3 12.7 (1) The increase in the effect of changes in cash flow assumptions is due to historical experience reflecting a decreasing trend in lapse and mortality rates on the long-term care insurance products for the year ended December 31, 2022. (2) Experience variance includes adverse development resulting from the allocation of the premium deficiency reserve to the cohort level for issue years where net premiums exceed gross premiums. The following table presents a reconciliation of the long-term care net future policy benefits and expenses to the future policy benefits and expenses reserve in the consolidated balance sheet: June 30, 2023 December 31, 2022 Long-term care $ 447.1 $ 428.2 Other 76.3 79.7 Total $ 523.4 $ 507.9 The following table presents the amount of undiscounted expected future benefit payments and expected gross premiums for the long-term care insurance contracts: June 30, 2023 December 31, 2022 Expected future benefits payments $ 837.3 $ 850.0 Expected future gross premiums $ 72.5 $ 76.2 The following table presents the amount of long-term care revenue and interest recognized in the consolidated statements of operations: June 30, 2023 June 30, 2022 Gross premiums $ 1.6 $ 1.7 Interest expense (original discount rate) $ 5.6 $ 5.3 The following table presents the weighted-average interest rate for long-term care insurance contracts: June 30, 2023 June 30, 2022 Interest expense (original discount rate) 5.95 % 5.95 % Current discount rate 5.10 % 3.40 % Concurrent with the transition period beginning January 1, 2021, the Company elected to account for the long-term care insurance contracts using reserve updates on a quarter lag whereby the September 30, 2020 cash flow and other assumptions are used for the pre-adoption December 31, 2020 future policy benefits and expenses reserve. Under the modified retrospective method, the long-term care insurance contracts are grouped into cohorts based on the contract’s issue year. Premium deficiency reserves are allocated proportional to the cohort’s reserve balance as of the transition date of December 31, 2020. At the cohort level, the NPR calculation is performed, and the unlocking of the NPR for cohorts in excess of 100% is recognized through opening retained earnings. A balance sheet remeasurement of the revised future policy benefits and expenses reserve is recorded using the current discount rate as of December 31, 2020 with the remeasurement amount recorded through AOCI. Discount rate changes between the original and current discount rate as of December 31, 2020 were significant. The original discount rate at transition is a spot rate of 5.95% which is based on the most recent premium deficiency unlocking discount rate prior to transition using asset yields from investments allocated to the product at the time of the unlocking of the assumption. The current discount rate at transition was 1.69% reflecting prevailing interest rates as of December 31, 2020. The amended guidance has no impact to consolidated stockholders’ equity or net income on the long-term care insurance contracts as the reserves are fully reinsured. The following table illustrates the impact of adoption on the long-term care insurance contracts: Future Policy Benefits and Expenses, pre-adoption December 31, 2020 $ 386.4 Effect of the remeasurement of the liability at current discount rate 250.8 Adjustment for loss contracts with NPR in excess of 100% under the modified retrospective approach 1.6 Adjusted balance, beginning of January 1, 2021 638.8 Less: reinsurance recoverable (638.8) Future Policy Benefits and Expenses, beginning of year January 1, 2021, net of reinsurance $ — The following presents the effect of transition adjustments on consolidated stockholders’ equity: January 1, 2021 Retained Earnings Accumulated Other Comprehensive Loss Future Policy Benefits and Expenses $ (1.6) $ (250.8)

Debt

Debt	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Debt	Debt Debt Issuance 2026 Senior Notes: In February 2023, the Company issued senior notes due February 2026 with an aggregate principal amount of $175.0 million, which bear interest at a rate of 6.1% per year and were issued at a 0.035% discount to the public (the “2026 Senior Notes”). Interest on the 2026 Senior Notes is payable semi-annually in arrears on February 27 and August 27 of each year, beginning on August 27, 2023. Prior to January 27, 2026, the Company may redeem all or part of the 2026 Senior Notes at a redemption price equal to 100% of the outstanding principal amount of the 2026 Senior Notes to be redeemed, plus a make-whole premium as described in the 2026 Senior Notes and accrued and unpaid interest up to the redemption date. On or after that date, the Company may redeem all or part of the 2026 Senior Notes at any time at a redemption price equal to 100% of the outstanding principal amount of the 2026 Senior Notes to be redeemed, plus accrued and unpaid interest up to the redemption date. In anticipation of the issuance of the 2026 Senior Notes, the Company entered into a derivative transaction to hedge the risk associated with changes in interest rates up to the date the 2026 Senior Notes were issued. The Company determined that the derivative qualified for cash flow hedge accounting and recognized a deferred gain of $1.4 million upon settlement which was reported through other comprehensive income. The deferred gain will be recognized as a reduction in interest expense related to the 2026 Senior Notes on an effective yield basis. Debt Redemption In March 2023, the Company used the net proceeds from the sale of the 2026 Senior Notes (and available cash on hand) to redeem $175.0 million of the $225.0 million then outstanding principal amount of its 4.20% Senior Notes due September 2023 plus accrued and unpaid interest up to the redemption date. In connection with the redemption, the Company recognized a net gain from the extinguishment of the debt of $0.1 million. The net gain resulted from the recognition of a previously deferred gain from the termination of a hedge of the interest rate risk associated with the redeemed notes, partially offset by the immediate recognition of the remaining deferred debt issuance costs relating to the redeemed notes.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Certain amounts included in the consolidated statements of comprehensive income are net of reclassification adjustments. The following tables summarize those reclassification adjustments (net of taxes) for the periods indicated: Three Months Ended June 30, 2023 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at March 31, 2023 $ (384.0) $ (434.0) $ 9.9 $ (91.4) $ (899.5) Change in accumulated other comprehensive income (loss) before reclassifications 23.7 (54.8) 2.3 0.4 (28.4) Amounts reclassified from accumulated other comprehensive income (loss) — 7.9 (0.2) (2.5) 5.2 Net current-period other comprehensive income (loss) 23.7 (46.9) 2.1 (2.1) (23.2) Balance at June 30, 2023 $ (360.3) $ (480.9) $ 12.0 $ (93.5) $ (922.7) Three Months Ended June 30, 2022 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at March 31, 2022 $ (325.6) $ (78.2) $ 11.8 $ (93.3) $ (485.3) Change in accumulated other comprehensive income (loss) before reclassifications (41.9) (305.0) — (0.6) (347.5) Amounts reclassified from accumulated other comprehensive income (loss) — 13.1 (0.7) (1.8) 10.6 Net current-period other comprehensive income (loss) (41.9) (291.9) (0.7) (2.4) (336.9) Balance at June 30, 2022 $ (367.5) $ (370.1) $ 11.1 $ (95.7) $ (822.2) Six Months Ended June 30, 2023 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at December 31, 2022 $ (394.0) $ (513.2) $ 9.8 $ (88.8) $ (986.2) Change in accumulated other comprehensive income (loss) before reclassifications 33.7 21.2 3.4 0.3 58.6 Amounts reclassified from accumulated other comprehensive income (loss) (1) — 11.1 (1.2) (5.0) 4.9 Net current-period other comprehensive income (loss) 33.7 32.3 2.2 (4.7) 63.5 Balance at June 30, 2023 $ (360.3) $ (480.9) $ 12.0 $ (93.5) $ (922.7) Six Months Ended June 30, 2022 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at December 31, 2021 $ (326.9) $ 256.6 $ 12.4 $ (92.1) $ (150.0) Change in accumulated other comprehensive income (loss) before reclassifications (40.6) (652.8) — — (693.4) Amounts reclassified from accumulated other comprehensive income (loss) — 26.1 (1.3) (3.6) 21.2 Net current-period other (40.6) (626.7) (1.3) (3.6) (672.2) Balance at June 30, 2022 $ (367.5) $ (370.1) $ 11.1 $ (95.7) $ (822.2) The following tables summarize the reclassifications out of AOCI for the periods indicated: Details about accumulated other comprehensive income components Amount reclassified from Affected line item in the Three Months Ended June 30, 2023 2022 Net unrealized losses (gains) on investments $ 10.0 $ 16.6 Net realized losses (gains) on investments (2.1) (3.5) Provision for income taxes $ 7.9 $ 13.1 Net of tax Net unrealized gains on derivative transactions $ (0.7) $ (0.9) Interest expense 0.4 — Underwriting, selling, general and administrative expenses 0.1 0.2 Provision for income taxes $ (0.2) $ (0.7) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.3 $ 1.1 (1) Amortization of prior service credit (3.4) (3.4) (1) (3.1) (2.3) 0.6 0.5 Provision for income taxes $ (2.5) $ (1.8) Net of tax Total reclassifications for the period $ 5.2 $ 10.6 Net of tax Details about accumulated other comprehensive income components Amount reclassified from Affected line item in the Six Months Ended June 30, 2023 2022 Net unrealized losses (gains) on investments $ 14.0 $ 33.0 Net realized losses (gains) on investments (2.9) (6.9) Provision for income taxes $ 11.1 $ 26.1 Net of tax Net unrealized gains on derivative transactions $ (2.0) $ (1.6) Interest expense 0.4 — Underwriting, selling, general and administrative expenses 0.4 0.3 Provision for income taxes $ (1.2) $ (1.3) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.6 $ 2.2 (1) Amortization of prior service credit (6.8) (6.8) (1) (6.2) (4.6) 1.2 1.0 Provision for income taxes $ (5.0) $ (3.6) Net of tax Total reclassifications for the period $ 4.9 $ 21.2 Net of tax

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The following table presents net income, the weighted average common shares used in calculating basic EPS and those used in calculating diluted EPS for each period presented below. Diluted EPS reflects the incremental common shares from common shares issuable upon vesting of performance share units (“PSUs”) and the purchase of shares under the Employee Stock Purchase Plan (the “ESPP”) using the treasury stock method. The outstanding restricted stock units (“RSUs”) have non-forfeitable rights to dividend equivalents and are therefore included in calculating basic and diluted EPS under the two-class method. Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Numerator Net income $ 156.3 $ 52.2 $ 269.9 $ 201.2 Less: Common stock dividends paid (39.7) (38.6) (76.7) (76.0) Undistributed earnings $ 116.6 $ 13.6 $ 193.2 $ 125.2 Denominator Weighted average common shares outstanding used in basic per common share calculations 53,745,611 54,607,321 53,619,711 55,190,104 Incremental common shares from: PSUs 78,906 361,287 158,159 427,503 ESPP 65,165 46,339 65,165 46,339 Weighted average common shares outstanding used in diluted per common share calculations 53,889,682 55,014,947 53,843,035 55,663,946 Earnings per common share - Basic Distributed earnings $ 0.74 $ 0.71 $ 1.43 $ 1.38 Undistributed earnings 2.17 0.25 3.60 2.27 Net income $ 2.91 $ 0.96 $ 5.03 $ 3.65 Earnings per common share - Diluted Distributed earnings $ 0.74 $ 0.70 $ 1.42 $ 1.36 Undistributed earnings 2.16 0.25 3.59 2.25 Net income $ 2.90 $ 0.95 $ 5.01 $ 3.61 Average PSUs totaling 58,380 and 82,222 for the three months ended June 30, 2023 and 2022, respectively, were anti-dilutive and thus not included in the computation of diluted EPS under the treasury stock method. Average PSUs totaling 60,766 and 48,673 for the six months ended June 30, 2023 and 2022, respectively, were anti-dilutive and thus not included in the computation of diluted EPS under the treasury stock method.

Retirement and Other Employee B

Retirement and Other Employee Benefits	6 Months Ended
	Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Retirement and Other Employee Benefits	Retirement and Other Employee Benefits The Company and its subsidiaries participate in a non-contributory, qualified defined benefit pension plan (“Assurant Pension Plan”) covering substantially all employees prior to closing to new hires on January 1, 2014. The Company also has various non-contributory, non-qualified supplemental plans covering certain employees, including the Assurant Executive Pension Plan and the Assurant Supplemental Executive Retirement Plan. The qualified and non-qualified plans are referred to as “Pension Benefits” unless otherwise noted. In addition, the Company provides certain life and health care benefits (“Retirement Health Benefits”) for retired employees and their dependents. The Pension Benefits and Retirement Health Benefits (together, the “Plans”) were frozen on March 1, 2016. In February 2020, the Company amended the Retirement Health Benefits to terminate effective December 31, 2024 (the “Termination Date”). Benefits will be paid up to the Termination Date. The Retirement Health Benefits obligations were re-measured using a discount rate of 1.55%, selected based on a cash flow analysis using a bond yield curve as of February 29, 2020, and the fair market value of the Retirement Health Benefits assets as of February 29, 2020. The remeasurement resulted in a reduction to the Retirement Health Benefits obligations of $65.6 million and a corresponding prior service credit in AOCI, which will be reclassified from AOCI as it is amortized in the net periodic benefit cost over the remaining period until the Termination Date. The following tables present the components of net periodic benefit cost for the Plans for the three and six months ended June 30, 2023 and 2022: Qualified Pension Benefits Unfunded Non-qualified Retirement Health For the Three Months Ended June 30, For the Three Months Ended June 30, For the Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Interest cost $ 7.0 $ 4.2 $ 0.6 $ 0.3 $ 0.1 $ 0.1 Expected return on plan assets (10.3) (6.9) — — (0.4) (0.4) Amortization of prior service credit — — — — (3.4) (3.4) Amortization of net loss (gain) — 0.7 0.3 0.6 — (0.2) Net periodic benefit cost $ (3.3) $ (2.0) $ 0.9 $ 0.9 $ (3.7) $ (3.9) Qualified Pension Benefits Unfunded Nonqualified Retirement Health For the Six Months Ended June 30, For the Six Months Ended June 30, For the Six Months Ended June 30, 2023 2022 2023 2022 2023 2022 Interest cost $ 14.0 $ 8.4 $ 1.2 $ 0.7 $ 0.2 $ 0.1 Expected return on plan assets (20.6) (13.8) — — (0.8) (0.7) Amortization of prior service credit — — — — (6.8) (6.8) Amortization of net loss (gain) — 1.5 0.6 1.1 — (0.4) Net periodic benefit cost $ (6.6) $ (3.9) $ 1.8 $ 1.8 $ (7.4) $ (7.8) The Assurant Pension Plan funded status was $95.5 million at June 30, 2023 and $94.1 million at December 31, 2022 (based on the fair value of the assets compared to the accumulated benefit obligation). This equates to a 118%

Restructuring and Related Impai

Restructuring and Related Impairment Charges	6 Months Ended
	Jun. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring and Related Impairment Charges	Restructuring and Related Impairment Charges In December 2022, the Company finalized its plan to realize greater efficiencies by continuing to simplify its business portfolio and leverage its global footprint to reduce costs. This included realigning its organizational structure and talent to support its business strategy (the “transformational plan”). The Company also accelerated its ongoing real estate consolidation to support work-from-home arrangements given its increasingly hybrid workforce (the “return to work strategy”). The Company expects to complete these actions in 2023. The following table summarizes the costs by major type that are recorded in underwriting, selling, general and administrative expenses in the consolidated statement of operations for the three and six months ended June 30, 2023, cumulative costs incurred through December 31, 2022, the estimated remaining costs to be incurred and the estimated total costs. Substantially all of the charges are expected to be cash. Restructuring costs related to strategic exit activities (outside of normal periodic restructuring and cost management activities) are not allocated to a reportable segment. Costs Incurred for Three Months Ended June 30, 2023 Costs Incurred for Six Months Ended June 30, 2023 Cumulative Costs Incurred Through December 31, 2022 Estimated Remaining Costs Estimated Total Costs Transformational plan: Severance and other employee benefits $ (1.3) $ (2.9) $ 31.7 $ 6.2 $ 35.0 Total transformational plan (1.3) (2.9) 31.7 6.2 35.0 Return to work strategy: Contract exit costs — 4.9 15.5 — 20.4 Fixed asset impairment — — 1.1 — 1.1 Right-of-use asset impairment — 3.1 4.6 — 7.7 Total return to work strategy — 8.0 21.2 — 29.2 Total restructuring and impairment charges $ (1.3) $ 5.1 $ 52.9 $ 6.2 $ 64.2 The following table shows the roll forward of the accrued liability (included in accounts payable and other liabilities in the consolidated balance sheets) by major type. Transformational Plan Return to Work Strategy (contract exit costs) Balance at January 1, 2023 $ 29.3 $ 19.3 Charges incurred — 4.9 Non-cash adjustment (2.9) — Cash payments (13.4) (2.4) Balance at June 30, 2023 $ 13.0 $ 21.8

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit In the normal course of business, letters of credit are issued primarily to support reinsurance arrangements in which the Company is the reinsurer. These letters of credit are supported by commitments under which the Company is required to indemnify the financial institution issuing the letter of credit if the letter of credit is drawn. The Company had $2.7 million of letters of credit outstanding as of June 30, 2023 and December 31, 2022, respectively. Legal and Regulatory Matters The Company is involved in a variety of litigation and legal and regulatory proceedings relating to its current and past business operations and, from time to time, it may become involved in other such actions. The Company continues to defend itself vigorously in these proceedings. The Company has participated and may participate in settlements on terms that the Company considers reasonable.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pay vs Performance Disclosure
Net income	$ 156.3	$ 52.2	$ 269.9	$ 201.2

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Jun. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, these statements do not include all of the information and notes required by GAAP for complete financial statements. The consolidated balance sheet as of June 30, 2023, the consolidated statements of operations, consolidated statements of comprehensive income and consolidated statements of changes in equity for the three and six months ended June 30, 2023 and 2022 and the consolidated statements of cash flows for the six months ended June 30, 2023 and 2022 are unaudited. In the opinion of management, the interim data includes all adjustments necessary for a fair statement of the results for the interim periods. The unaudited interim consolidated financial statements include the accounts of the Company and all of its wholly owned subsidiaries. All inter-company transactions and balances are eliminated in consolidation. Certain prior period amounts have been revised to conform to the current period presentation, including the changes to the composition of the reportable segments described in Note 4 and changes in future policy benefits and expenses and reinsurance recoverables from the modified retrospective application of the new accounting pronouncement targeted improvements to long duration contracts as described in Notes 3 and 9.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Changes to GAAP are established by the Financial Accounting Standards Board (“FASB”) in the form of Accounting Standards Updates (“ASUs”) to the FASB Accounting Standards Codification. The Company considers the applicability and impact of all ASUs. The following table provides a description of ASUs recently issued by the FASB and the impact of their adoption on the Company’s consolidated financial statements. Adopted The table below describes the impacts of the ASUs adopted by the Company, effective January 1, 2023: Standard Summary of the Standard Effective date Impact of the Standard on the Company’s Financial Statements ASU 2018-12, Financial Services—Insurance The guidance includes the following primary In December 2022, the FASB issued guidance to provide entities an accounting policy election to not apply the accounting guidance to contracts or legal entities sold and derecognized before the effective date when the entity has no significant continuing involvement with them. The election may be applied on a transaction-by-transaction basis. January 1, 2023, to be applied retrospectively or modified retrospectively to January 1, 2021 The Company adopted this standard as of January 1, 2023 using the modified retrospective method on liabilities for future policy benefits and expenses to January 1, 2021 for long-term care insurance contracts that have been fully reinsured. The Company also adopted the amended guidance in ASU 2022-05 and elected to not apply the amended accounting guidance to long duration contracts of legal entities sold and derecognized before the January 1, 2023 effective date as the Company has no significant continuing involvement with them. The adoption of this standard along with the amended guidance on transition has no impact on equity or net income on the long-term care contracts as they are fully reinsured with third party reinsurers. However, disclosure along with a roll-forward table on a gross basis on the long-term care business is presented in Note 9. ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers The guidance improves comparability after a business combination is reported in the acquirer’s financial statements by providing consistent recognition and measurement guidance for revenue contracts with customers acquired in a business combination and revenue contracts with customers not acquired in a business combination. Generally, the acquirer will recognize the acquired contract assets and contract liabilities at the same amounts recorded by the acquiree. Historically, such amounts were recognized by the acquirer at fair value in the acquisition accounting. Under the amended guidance, the acquirer should account for the acquired revenue contracts as if it had originated the contracts. The amendments provide certain practical expedients for acquirers when recognizing and measuring acquired contract assets and contract liabilities from revenue contracts in a business combination. January 1, 2023, to be applied prospectively (with early adoption permitted). The Company adopted this standard from January 1, 2023. The amendments will be applied to business combinations occurring on or after the effective date of the amendments. Not Yet Adopted

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Schedule of Financial Information by Segment	The following table presents segment Adjusted EBITDA with a reconciliation to net income: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Adjusted EBITDA by segment: Global Lifestyle $ 197.0 $ 221.0 $ 395.9 $ 447.7 Global Housing 154.6 61.0 223.0 165.4 Corporate and Other (28.5) (24.9) (52.9) (47.1) Reconciling items to consolidated net income: Interest expense (27.2) (27.2) (54.2) (54.1) Depreciation expense (25.4) (21.8) (51.8) (42.1) Amortization of purchased intangible assets (18.7) (17.0) (37.4) (34.6) Net realized losses on investments and fair value changes to equity securities (20.0) (76.4) (30.6) (138.8) Non-core operations (1) (30.2) (36.7) (42.4) (42.2) Restructuring costs 1.3 (0.2) (5.1) (0.2) Assurant Health runoff operations (2) — (0.5) 7.5 (0.5) Other adjustments 1.4 (7.4) (0.6) (8.4) Total reconciling items (118.8) (187.2) (214.6) (320.9) Income before income tax expense 204.3 69.9 351.4 245.1 Income tax expense 48.0 17.7 81.5 43.9 Net income $ 156.3 $ 52.2 $ 269.9 $ 201.2 (1) Consists of certain businesses which the Company has fully exited or expects to fully exit, including the long-tail commercial liability businesses (sharing economy and small commercial businesses), as well as certain legacy long-duration insurance policies (collectively referred to as “non-core operations”). The non-core operations do not qualify as held for sale or discontinued operations under GAAP accounting guidance and are presented as a reconciling item to consolidated net income. (2) In first quarter 2023, the Company recorded income of $7.5 million related to a payment it received from Time Insurance Company (“TIC”) pursuant to a participation agreement that the Company had with TIC in connection with its sale by the Company in 2018. The payment related to the Company’s prior participation in the risk adjustment program introduced by the Patient Protection and Affordable Care Act of 2010. The Company’s net earned premiums, fees and other income by segment and product are as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Global Lifestyle: Connected Living $ 1,079.2 $ 1,070.2 $ 2,105.8 $ 2,147.6 Global Automotive 1,029.7 942.4 2,043.4 1,853.6 Total $ 2,108.9 $ 2,012.6 $ 4,149.2 $ 4,001.2 Global Housing: Homeowners $ 412.3 $ 344.1 $ 803.7 $ 681.5 Renters and Other 124.3 122.3 238.2 242.2 Total $ 536.6 $ 466.4 $ 1,041.9 $ 923.7 The following table presents total assets by segment: June 30, 2023 December 31, 2022 Global Lifestyle (1) $ 27,227.4 $ 27,404.1 Global Housing (1) 4,414.1 4,382.6 Corporate and Other (2) 1,463.2 1,330.6 Segment assets $ 33,104.7 $ 33,117.3 (1) Segment assets for Global Lifestyle and Global Housing do not include net unrealized gains (losses) on securities attributable to those segments, which are all included within Corporate and Other.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2023
Investments [Abstract]
Amortized Cost, Gross Unrealized Gains and Losses, Fair Value	The following tables show the cost or amortized cost, allowance for credit losses, gross unrealized gains and losses, and fair value of the Company’s fixed maturity securities as of the dates indicated: June 30, 2023 Cost or Allowance for Credit Losses Gross Gross Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 72.9 $ — $ 0.2 $ (5.7) $ 67.4 States, municipalities and political subdivisions 141.9 — 0.5 (13.5) 128.9 Foreign governments 458.4 — 4.1 (17.3) 445.2 Asset-backed 843.1 — 2.9 (34.1) 811.9 Commercial mortgage-backed 407.8 — 0.1 (57.5) 350.4 Residential mortgage-backed 519.7 — 0.4 (55.7) 464.4 U.S. corporate 3,332.2 — 13.7 (298.4) 3,047.5 Foreign corporate 1,434.8 — 5.2 (137.9) 1,302.1 Total fixed maturity securities $ 7,210.8 $ — $ 27.1 $ (620.1) $ 6,617.8 December 31, 2022 Cost or Allowance for Credit Losses Gross Gross Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 92.9 $ — $ 0.2 $ (6.7) $ 86.4 States, municipalities and political subdivisions 152.4 — 1.1 (16.0) 137.5 Foreign governments 416.2 — 0.6 (20.5) 396.3 Asset-backed 735.1 — 1.4 (40.2) 696.3 Commercial mortgage-backed 458.6 — 0.2 (56.5) 402.3 Residential mortgage-backed 492.7 — 0.4 (55.1) 438.0 U.S. corporate 3,265.1 — 13.9 (317.9) 2,961.1 Foreign corporate 1,307.8 — 3.4 (145.4) 1,165.8 Total fixed maturity securities $ 6,920.8 $ — $ 21.2 $ (658.3) $ 6,283.7
Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity	The cost or amortized cost and fair value of fixed maturity securities as of June 30, 2023 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties. Cost or Fair Value Due in one year or less $ 194.5 $ 192.8 Due after one year through five years 1,751.7 1,667.8 Due after five years through ten years 2,461.0 2,256.6 Due after ten years 1,033.0 873.9 Total 5,440.2 4,991.1 Asset-backed 843.1 811.9 Commercial mortgage-backed 407.8 350.4 Residential mortgage-backed 519.7 464.4 Total $ 7,210.8 $ 6,617.8
Net Realized Gains (Losses), Including Impairments	The following table sets forth the net realized gains (losses) on investments and fair value changes to equity securities, including impairments, recognized in the consolidated statements of operations for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities: Fixed maturity securities $ (7.8) $ (22.6) $ (11.8) $ (41.1) Equity securities (1) (9.8) (54.0) (12.9) (97.2) Commercial mortgage loans on real estate 0.2 — (1.3) 0.2 Other investments 0.5 1.8 1.0 1.4 Total net realized losses on investments related to sales and other and fair value changes to equity securities (16.9) (74.8) (25.0) (136.7) Net realized losses related to impairments: Fixed maturity securities (2.1) (1.6) (2.1) (1.6) Other investments (1.0) — (3.5) (0.5) Total net realized losses related to impairments (3.1) (1.6) (5.6) (2.1) Total net realized losses on investments and fair value changes to equity securities $ (20.0) $ (76.4) $ (30.6) $ (138.8) (1) Upward adjustments of $0.4 million, $0.4 million, $9.5 million and $19.5 million for the three and six months ended June 30, 2023 and 2022 and impairments of $1.0 million, $3.5 million, $0.0 million and $0.0 million for the three and six months ended June 30, 2023 and 2022, respectively, were realized on equity investments accounted for under the measurement alternative.
Unrealized Gains on Equity Securities	The following table sets forth the portion of fair value changes to equity securities held for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Net losses recognized on equity securities $ (9.8) $ (54.0) $ (12.9) $ (97.2) Less: Net realized (losses) gains related to sales of equity securities (1.5) 8.4 (2.3) 20.2 Total fair value changes to equity securities held (1) $ (8.3) $ (62.4) $ (10.6) $ (117.4)
Equity Securities without Readily Determinable Fair Value	The following table summarizes information related to these investments: June 30, 2023 December 31, 2022 Initial cost $ 82.1 $ 81.7 Cumulative upward adjustments 51.2 50.8 Cumulative downward adjustments (including impairments) (8.4) (5.0) Carrying value $ 124.9 $ 127.5
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of June 30, 2023 and December 31, 2022 were as follows: June 30, 2023 Less than 12 months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Fixed maturity securities: U.S. government and government agencies and authorities $ 19.9 $ (0.4) $ 44.1 $ (5.3) $ 64.0 $ (5.7) States, municipalities and political subdivisions 37.7 (2.0) 64.8 (11.5) 102.5 (13.5) Foreign governments 95.3 (2.1) 213.9 (15.2) 309.2 (17.3) Asset-backed 156.9 (7.3) 435.9 (26.8) 592.8 (34.1) Commercial mortgage-backed 96.4 (9.7) 248.6 (47.8) 345.0 (57.5) Residential mortgage-backed 200.7 (9.4) 233.7 (46.3) 434.4 (55.7) U.S. corporate 1,292.9 (49.4) 1,398.8 (249.0) 2,691.7 (298.4) Foreign corporate 424.8 (13.9) 775.3 (124.0) 1,200.1 (137.9) Total fixed maturity securities $ 2,324.6 $ (94.2) $ 3,415.1 $ (525.9) $ 5,739.7 $ (620.1) December 31, 2022 Less than 12 months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized Fixed maturity securities: U.S. government and government agencies and authorities $ 58.5 $ (2.9) $ 24.6 $ (3.8) $ 83.1 $ (6.7) States, municipalities and political subdivisions 77.4 (7.8) 34.5 (8.2) 111.9 (16.0) Foreign governments 268.5 (12.1) 92.7 (8.4) 361.2 (20.5) Asset-backed 378.2 (22.0) 218.5 (18.2) 596.7 (40.2) Commercial mortgage-backed 290.7 (33.2) 109.3 (23.3) 400.0 (56.5) Residential mortgage-backed 371.3 (31.7) 58.6 (23.4) 429.9 (55.1) U.S. corporate 2,266.6 (206.3) 370.3 (111.6) 2,636.9 (317.9) Foreign corporate 843.9 (79.0) 251.8 (66.4) 1,095.7 (145.4) Total fixed maturity securities $ 4,555.1 $ (395.0) $ 1,160.3 $ (263.3) $ 5,715.4 $ (658.3)
Credit Quality Indicators	The following table presents the amortized cost basis of commercial mortgage loans, excluding the allowance for credit losses, by origination year for certain key credit quality indicators at June 30, 2023 and December 31, 2022. June 30, 2023 Origination Year 2023 2022 2021 2020 2019 Prior Total % of Total Loan to value 70% and less $ 17.6 $ 47.5 $ 43.0 $ — $ — $ 70.6 $ 178.7 58.4 % 71% to 80% 2.5 29.6 68.2 2.8 — 4.5 107.6 35.2 % 81% to 95% — — 17.7 — — 1.8 19.5 6.4 % Greater than 95% — — — — — — — — % Total $ 20.1 $ 77.1 $ 128.9 $ 2.8 $ — $ 76.9 $ 305.8 100.0 % June 30, 2023 Origination Year 2023 2022 2021 2020 2019 Prior Total % of Total Debt-service coverage ratios (2): Greater than 2.0 $ — $ 24.9 $ 11.6 $ — $ — $ 48.0 $ 84.5 27.6 % 1.5 to 2.0 13.9 26.5 11.5 — — 10.8 62.7 20.5 % 1.0 to 1.5 6.2 25.7 56.1 — — 12.9 100.9 33.0 % Less than 1.0 — — 49.7 2.8 — 5.2 57.7 18.9 % Total $ 20.1 $ 77.1 $ 128.9 $ 2.8 $ — $ 76.9 $ 305.8 100.0 % December 31, 2022 Origination Year 2022 2021 2020 2019 2018 Prior Total % of Total Loan to value 70% and less $ 44.0 $ 45.1 $ — $ — $ — $ 76.0 $ 165.1 55.5 % 71% to 80% 32.7 75.7 2.7 — 4.6 — 115.7 38.9 % 81% to 95% — 14.7 — — — — 14.7 5.0 % Greater than 95% — — — — — 1.9 1.9 0.6 % Total $ 76.7 $ 135.5 $ 2.7 $ — $ 4.6 $ 77.9 $ 297.4 100.0 % December 31, 2022 Origination Year 2022 2021 2020 2019 2018 Prior Total % of Total Debt-service coverage ratios (2): Greater than 2.0 $ 24.2 $ 11.7 $ — $ — $ — $ 50.8 $ 86.7 29.2 % 1.5 to 2.0 26.8 11.6 — — 4.6 6.6 49.6 16.7 % 1.0 to 1.5 25.7 63.0 — — — 13.7 102.4 34.4 % Less than 1.0 — 49.2 2.7 — — 6.8 58.7 19.7 % Total $ 76.7 $ 135.5 $ 2.7 $ — $ 4.6 $ 77.9 $ 297.4 100.0 % (1) Loan-to-value ratio derived from current principal amount of the loan divided by the fair value of the property. The fair value of the underlying commercial properties is updated at least annually.

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Hierarchy for Assets and Liabilities	The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of June 30, 2023 and December 31, 2022. The amounts presented below for short-term investments, other investments, cash equivalents, other assets, assets held in and liabilities related to separate accounts and other liabilities differ from the amounts presented in the consolidated balance sheets because only certain investments or certain assets and liabilities within these line items are measured at estimated fair value. Other investments are comprised of investments in the Assurant Investment Plan (“AIP”), the American Security Insurance Company Investment Plan, the Assurant Deferred Compensation Plan and other derivatives. Other liabilities are comprised of investments in the AIP, contingent considerations related to business combinations and other derivatives. The fair value amount and the majority of the associated levels presented for other investments and assets and liabilities held in separate accounts are received directly from third parties. June 30, 2023 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 67.4 $ — $ 67.4 $ — States, municipalities and political subdivisions 128.9 — 128.9 — Foreign governments 445.2 — 445.2 — Asset-backed 811.9 — 733.1 78.8 Commercial mortgage-backed 350.4 — 350.4 — Residential mortgage-backed 464.4 — 464.4 — U.S. corporate 3,047.5 — 3,011.7 35.8 Foreign corporate 1,302.1 — 1,294.4 7.7 Equity securities: Mutual funds 33.1 33.1 — — Common stocks 19.4 18.7 0.7 — Non-redeemable preferred stocks 207.1 — 207.1 — Short-term investments 230.8 170.2 (2) 60.6 (3) — Other investments 66.9 66.7 (1) — 0.2 (4) Cash equivalents 755.7 735.2 (2) 20.5 (3) — Other assets 2.9 — 2.9 (4) — Assets held in separate accounts 10.6 8.0 (1) 2.6 (3) — Total financial assets $ 7,944.3 $ 1,031.9 $ 6,789.9 $ 122.5 Financial Liabilities Other liabilities $ 66.7 $ 66.7 (1) $ — $ — Liabilities related to separate accounts 10.6 8.0 (1) 2.6 (3) — Total financial liabilities $ 77.3 $ 74.7 $ 2.6 $ — December 31, 2022 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 86.4 $ — $ 86.4 $ — States, municipalities and political subdivisions 137.5 — 137.5 — Foreign governments 396.3 — 396.3 — Asset-backed 696.3 — 635.9 60.4 Commercial mortgage-backed 402.3 — 402.3 — Residential mortgage-backed 438.0 — 438.0 — U.S. corporate 2,961.1 — 2,932.3 28.8 Foreign corporate 1,165.8 — 1,158.4 7.4 Equity securities: Mutual funds 32.7 32.7 — — Common stocks 23.9 23.2 0.7 — Non-redeemable preferred stocks 224.7 — 224.7 — Short-term investments 119.9 72.2 (2) 47.7 (3) — Other investments 60.3 60.1 (1) — 0.2 (4) Cash equivalents 789.1 647.3 (2) 141.8 (3) — Assets held in separate accounts 10.1 4.8 (1) 5.3 (3) — Total financial assets $ 7,544.4 $ 840.3 $ 6,607.3 $ 96.8 Financial Liabilities Other liabilities $ 75.3 $ 60.1 (1) $ 0.2 (4) $ 15.0 (5) Liabilities related to separate accounts 10.1 4.8 (1) 5.3 (3) — Total financial liabilities $ 85.4 $ 64.9 $ 5.5 $ 15.0 (1) Primarily includes mutual funds and related obligations. (2) Primarily includes money market funds. (3) Primarily includes fixed maturity securities and related obligations. (4) Primarily includes derivatives. (5) Includes contingent consideration liabilities.
Carrying Value and Fair Value of the Financial Instruments that are Not recognized or are Not Carried at Fair Value	The following tables disclose the carrying value, fair value and hierarchy level of the financial instruments that are not recognized or are not carried at fair value in the consolidated balance sheets as of the dates indicated: June 30, 2023 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 302.7 $ 285.6 $ — $ — $ 285.6 Other investments 6.4 6.4 1.5 — 4.9 Other assets 16.0 16.0 — — 16.0 Total financial assets $ 325.1 $ 308.0 $ 1.5 $ — $ 306.5 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 7.5 $ 7.8 $ — $ — $ 7.8 Funds withheld under reinsurance 376.2 376.2 376.2 — — Debt 2,129.4 1,926.5 — 1,926.5 — Total financial liabilities $ 2,513.1 $ 2,310.5 $ 376.2 $ 1,926.5 $ 7.8 December 31, 2022 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 295.6 $ 278.2 $ — $ — $ 278.2 Other investments 6.7 6.7 1.6 — 5.1 Other assets 12.7 12.7 — — 12.7 Total financial assets $ 315.0 $ 297.6 $ 1.6 $ — $ 296.0 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 8.0 $ 8.4 $ — $ — $ 8.4 Funds withheld under reinsurance 366.6 366.6 366.6 — — Debt 2,129.9 1,932.7 — 1,932.7 — Total financial liabilities $ 2,504.5 $ 2,307.7 $ 366.6 $ 1,932.7 $ 8.4

Deferred Acquisition Costs (Tab

Deferred Acquisition Costs (Tables)	6 Months Ended
	Jun. 30, 2023
Deferred Policy Acquisition Costs Disclosures [Abstract]
Schedule of Deferred Acquisition Costs	The following table discloses information about deferred acquisition costs as of the dates indicated: For the Three Months Ended June 30, For the Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 9,683.0 $ 9,025.4 $ 9,677.1 $ 8,811.0 Costs deferred 1,168.9 1,233.6 2,159.2 2,337.5 Amortization (1,033.4) (900.0) (2,017.8) (1,789.5) Ending balance $ 9,818.5 $ 9,359.0 $ 9,818.5 $ 9,359.0

Reserves (Tables)

Reserves (Tables)	6 Months Ended
	Jun. 30, 2023
Insurance Loss Reserves [Abstract]
Roll Forward of Claims and Benefits Payable	The following table provides a roll forward of the Company’s beginning and ending claims and benefits payable balances. Claims and benefits payable is the liability for unpaid loss and loss adjustment expenses and is comprised of case and incurred but not reported (“IBNR”) reserves. Since unpaid loss and loss adjustment expenses are estimates, the Company’s actual losses incurred may be more or less than the Company’s previously developed estimates, which is referred to as either unfavorable or favorable development, respectively. The best estimate of ultimate loss and loss adjustment expense is generally selected from a blend of methods that are applied consistently each period. There have been no significant changes in the methodologies and assumptions utilized in estimating the liability for unpaid loss and loss adjustment expenses for any of the periods presented. For the Six Months Ended June 30, 2023 2022 Claims and benefits payable, at beginning of period $ 2,210.0 $ 1,523.0 Less: Reinsurance ceded and other (1,228.8) (744.1) Net claims and benefits payable, at beginning of period 981.2 778.9 Incurred losses and loss adjustment expenses related to: Current year 1,293.1 1,070.3 Prior years (15.0) 19.7 Total incurred losses and loss adjustment expenses 1,278.1 1,090.0 Paid losses and loss adjustment expenses related to: Current year 708.4 631.6 Prior years 438.6 383.5 Total paid losses and loss adjustment expenses 1,147.0 1,015.1 Net claims and benefits payable, at end of period 1,112.3 853.8 Plus: Reinsurance ceded and other (1) 908.0 600.8 Claims and benefits payable, at end of period (1) $ 2,020.3 $ 1,454.6
Balances of and Changes in Liability for Future Policy Benefits	The following table presents the balances and changes in the long-term care future policy benefits and expenses reserve: June 30, 2023 December 31, 2022 Present value of expected net premiums Balance, beginning of period $ 34.2 $ 37.1 Beginning balance at original discount rate 33.4 29.2 Effect of changes in cash flow assumptions (1) — 9.4 Effect of actual variances from expected experience 3.3 (2.7) Adjusted beginning of period balance 36.7 35.9 Experience variance (2) — (0.3) Interest accrual 0.9 4.6 Net premiums collected (1.6) (6.8) Ending balance at original discount rate 36.0 33.4 Effect of changes in discount rate assumptions 1.8 0.8 Balance, end of period $ 37.8 $ 34.2 Present value of expected future policy benefits Balance, beginning of period $ 462.4 $ 658.5 Beginning balance at original discount rate 444.4 430.0 Effect of changes in cash flow assumptions (1) — 12.3 Effect of actual variances from expected experience 4.3 (3.3) Adjusted beginning of period balance 448.7 439.0 Experience variance (2) (1.0) (1.2) Interest accrual 6.5 24.7 Benefit payments (5.1) (18.1) Ending balance at original discount rate 449.1 444.4 Effect of changes in discount rate assumptions 35.8 18.0 Balance, end of period $ 484.9 $ 462.4 Net future policy benefits and expenses $ 447.1 $ 428.2 Related reinsurance recoverable 447.1 428.2 Net future policy benefits and expenses, after reinsurance recoverable $ — $ — Weighted-average liability duration of the future policy benefits and expenses (in years) 12.3 12.7 (1) The increase in the effect of changes in cash flow assumptions is due to historical experience reflecting a decreasing trend in lapse and mortality rates on the long-term care insurance products for the year ended December 31, 2022. (2) Experience variance includes adverse development resulting from the allocation of the premium deficiency reserve to the cohort level for issue years where net premiums exceed gross premiums. The following table presents a reconciliation of the long-term care net future policy benefits and expenses to the future policy benefits and expenses reserve in the consolidated balance sheet: June 30, 2023 December 31, 2022 Long-term care $ 447.1 $ 428.2 Other 76.3 79.7 Total $ 523.4 $ 507.9 The following table presents the amount of undiscounted expected future benefit payments and expected gross premiums for the long-term care insurance contracts: June 30, 2023 December 31, 2022 Expected future benefits payments $ 837.3 $ 850.0 Expected future gross premiums $ 72.5 $ 76.2 The following table presents the amount of long-term care revenue and interest recognized in the consolidated statements of operations: June 30, 2023 June 30, 2022 Gross premiums $ 1.6 $ 1.7 Interest expense (original discount rate) $ 5.6 $ 5.3 The following table presents the weighted-average interest rate for long-term care insurance contracts: June 30, 2023 June 30, 2022 Interest expense (original discount rate) 5.95 % 5.95 % Current discount rate 5.10 % 3.40 % The following table illustrates the impact of adoption on the long-term care insurance contracts: Future Policy Benefits and Expenses, pre-adoption December 31, 2020 $ 386.4 Effect of the remeasurement of the liability at current discount rate 250.8 Adjustment for loss contracts with NPR in excess of 100% under the modified retrospective approach 1.6 Adjusted balance, beginning of January 1, 2021 638.8 Less: reinsurance recoverable (638.8) Future Policy Benefits and Expenses, beginning of year January 1, 2021, net of reinsurance $ — The following presents the effect of transition adjustments on consolidated stockholders’ equity: January 1, 2021 Retained Earnings Accumulated Other Comprehensive Loss Future Policy Benefits and Expenses $ (1.6) $ (250.8)

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of Accumulated Other Comprehensive Income, Net of Tax	The following tables summarize those reclassification adjustments (net of taxes) for the periods indicated: Three Months Ended June 30, 2023 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at March 31, 2023 $ (384.0) $ (434.0) $ 9.9 $ (91.4) $ (899.5) Change in accumulated other comprehensive income (loss) before reclassifications 23.7 (54.8) 2.3 0.4 (28.4) Amounts reclassified from accumulated other comprehensive income (loss) — 7.9 (0.2) (2.5) 5.2 Net current-period other comprehensive income (loss) 23.7 (46.9) 2.1 (2.1) (23.2) Balance at June 30, 2023 $ (360.3) $ (480.9) $ 12.0 $ (93.5) $ (922.7) Three Months Ended June 30, 2022 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at March 31, 2022 $ (325.6) $ (78.2) $ 11.8 $ (93.3) $ (485.3) Change in accumulated other comprehensive income (loss) before reclassifications (41.9) (305.0) — (0.6) (347.5) Amounts reclassified from accumulated other comprehensive income (loss) — 13.1 (0.7) (1.8) 10.6 Net current-period other comprehensive income (loss) (41.9) (291.9) (0.7) (2.4) (336.9) Balance at June 30, 2022 $ (367.5) $ (370.1) $ 11.1 $ (95.7) $ (822.2) Six Months Ended June 30, 2023 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at December 31, 2022 $ (394.0) $ (513.2) $ 9.8 $ (88.8) $ (986.2) Change in accumulated other comprehensive income (loss) before reclassifications 33.7 21.2 3.4 0.3 58.6 Amounts reclassified from accumulated other comprehensive income (loss) (1) — 11.1 (1.2) (5.0) 4.9 Net current-period other comprehensive income (loss) 33.7 32.3 2.2 (4.7) 63.5 Balance at June 30, 2023 $ (360.3) $ (480.9) $ 12.0 $ (93.5) $ (922.7) Six Months Ended June 30, 2022 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at December 31, 2021 $ (326.9) $ 256.6 $ 12.4 $ (92.1) $ (150.0) Change in accumulated other comprehensive income (loss) before reclassifications (40.6) (652.8) — — (693.4) Amounts reclassified from accumulated other comprehensive income (loss) — 26.1 (1.3) (3.6) 21.2 Net current-period other (40.6) (626.7) (1.3) (3.6) (672.2) Balance at June 30, 2022 $ (367.5) $ (370.1) $ 11.1 $ (95.7) $ (822.2)
Reclassification out of Accumulated Other Comprehensive Income	The following tables summarize the reclassifications out of AOCI for the periods indicated: Details about accumulated other comprehensive income components Amount reclassified from Affected line item in the Three Months Ended June 30, 2023 2022 Net unrealized losses (gains) on investments $ 10.0 $ 16.6 Net realized losses (gains) on investments (2.1) (3.5) Provision for income taxes $ 7.9 $ 13.1 Net of tax Net unrealized gains on derivative transactions $ (0.7) $ (0.9) Interest expense 0.4 — Underwriting, selling, general and administrative expenses 0.1 0.2 Provision for income taxes $ (0.2) $ (0.7) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.3 $ 1.1 (1) Amortization of prior service credit (3.4) (3.4) (1) (3.1) (2.3) 0.6 0.5 Provision for income taxes $ (2.5) $ (1.8) Net of tax Total reclassifications for the period $ 5.2 $ 10.6 Net of tax Details about accumulated other comprehensive income components Amount reclassified from Affected line item in the Six Months Ended June 30, 2023 2022 Net unrealized losses (gains) on investments $ 14.0 $ 33.0 Net realized losses (gains) on investments (2.9) (6.9) Provision for income taxes $ 11.1 $ 26.1 Net of tax Net unrealized gains on derivative transactions $ (2.0) $ (1.6) Interest expense 0.4 — Underwriting, selling, general and administrative expenses 0.4 0.3 Provision for income taxes $ (1.2) $ (1.3) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.6 $ 2.2 (1) Amortization of prior service credit (6.8) (6.8) (1) (6.2) (4.6) 1.2 1.0 Provision for income taxes $ (5.0) $ (3.6) Net of tax Total reclassifications for the period $ 4.9 $ 21.2 Net of tax

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS	The following table presents net income, the weighted average common shares used in calculating basic EPS and those used in calculating diluted EPS for each period presented below. Diluted EPS reflects the incremental common shares from common shares issuable upon vesting of performance share units (“PSUs”) and the purchase of shares under the Employee Stock Purchase Plan (the “ESPP”) using the treasury stock method. The outstanding restricted stock units (“RSUs”) have non-forfeitable rights to dividend equivalents and are therefore included in calculating basic and diluted EPS under the two-class method. Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Numerator Net income $ 156.3 $ 52.2 $ 269.9 $ 201.2 Less: Common stock dividends paid (39.7) (38.6) (76.7) (76.0) Undistributed earnings $ 116.6 $ 13.6 $ 193.2 $ 125.2 Denominator Weighted average common shares outstanding used in basic per common share calculations 53,745,611 54,607,321 53,619,711 55,190,104 Incremental common shares from: PSUs 78,906 361,287 158,159 427,503 ESPP 65,165 46,339 65,165 46,339 Weighted average common shares outstanding used in diluted per common share calculations 53,889,682 55,014,947 53,843,035 55,663,946 Earnings per common share - Basic Distributed earnings $ 0.74 $ 0.71 $ 1.43 $ 1.38 Undistributed earnings 2.17 0.25 3.60 2.27 Net income $ 2.91 $ 0.96 $ 5.03 $ 3.65 Earnings per common share - Diluted Distributed earnings $ 0.74 $ 0.70 $ 1.42 $ 1.36 Undistributed earnings 2.16 0.25 3.59 2.25 Net income $ 2.90 $ 0.95 $ 5.01 $ 3.61

Retirement and Other Employee_2

Retirement and Other Employee Benefits (Tables)	6 Months Ended
	Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Components of Net Periodic Benefit Cost	The following tables present the components of net periodic benefit cost for the Plans for the three and six months ended June 30, 2023 and 2022: Qualified Pension Benefits Unfunded Non-qualified Retirement Health For the Three Months Ended June 30, For the Three Months Ended June 30, For the Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Interest cost $ 7.0 $ 4.2 $ 0.6 $ 0.3 $ 0.1 $ 0.1 Expected return on plan assets (10.3) (6.9) — — (0.4) (0.4) Amortization of prior service credit — — — — (3.4) (3.4) Amortization of net loss (gain) — 0.7 0.3 0.6 — (0.2) Net periodic benefit cost $ (3.3) $ (2.0) $ 0.9 $ 0.9 $ (3.7) $ (3.9) Qualified Pension Benefits Unfunded Nonqualified Retirement Health For the Six Months Ended June 30, For the Six Months Ended June 30, For the Six Months Ended June 30, 2023 2022 2023 2022 2023 2022 Interest cost $ 14.0 $ 8.4 $ 1.2 $ 0.7 $ 0.2 $ 0.1 Expected return on plan assets (20.6) (13.8) — — (0.8) (0.7) Amortization of prior service credit — — — — (6.8) (6.8) Amortization of net loss (gain) — 1.5 0.6 1.1 — (0.4) Net periodic benefit cost $ (6.6) $ (3.9) $ 1.8 $ 1.8 $ (7.4) $ (7.8)

Restructuring and Related Imp_2

Restructuring and Related Impairment Charges (Tables)	6 Months Ended
	Jun. 30, 2023
Restructuring and Related Activities [Abstract]
Information Regarding Exit-Related Charges	Restructuring costs related to strategic exit activities (outside of normal periodic restructuring and cost management activities) are not allocated to a reportable segment. Costs Incurred for Three Months Ended June 30, 2023 Costs Incurred for Six Months Ended June 30, 2023 Cumulative Costs Incurred Through December 31, 2022 Estimated Remaining Costs Estimated Total Costs Transformational plan: Severance and other employee benefits $ (1.3) $ (2.9) $ 31.7 $ 6.2 $ 35.0 Total transformational plan (1.3) (2.9) 31.7 6.2 35.0 Return to work strategy: Contract exit costs — 4.9 15.5 — 20.4 Fixed asset impairment — — 1.1 — 1.1 Right-of-use asset impairment — 3.1 4.6 — 7.7 Total return to work strategy — 8.0 21.2 — 29.2 Total restructuring and impairment charges $ (1.3) $ 5.1 $ 52.9 $ 6.2 $ 64.2
Rollforward of Accrued Liability	The following table shows the roll forward of the accrued liability (included in accounts payable and other liabilities in the consolidated balance sheets) by major type. Transformational Plan Return to Work Strategy (contract exit costs) Balance at January 1, 2023 $ 29.3 $ 19.3 Charges incurred — 4.9 Non-cash adjustment (2.9) — Cash payments (13.4) (2.4) Balance at June 30, 2023 $ 13.0 $ 21.8

Nature of Operations (Details)

Nature of Operations (Details)	6 Months Ended
	Jun. 30, 2023 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	2

Segment Information - Narrative

Segment Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2023 segment
Segment Reporting [Abstract]
Number of reportable segments	3

Segment Information - Schedule

Segment Information - Schedule of Segment Adjusted EBITDA Disclosure (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reconciling items to consolidated net income:
Interest expense	$ (27.2)		$ (27.2)	$ (54.2)	$ (54.1)
Net realized losses on investments and fair value changes to equity securities	(20)		(76.4)	(30.6)	(138.8)
Income before income tax expense	204.3		69.9	351.4	245.1
Income tax expense	48		17.7	81.5	43.9
Net income	156.3		52.2	269.9	201.2
Disposal group, not discontinued operations | Time Insurance Company
Reconciling items to consolidated net income:
ACA risk corridor programs, proceeds from government refunds		$ 7.5
Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA by segment:	(28.5)		(24.9)	(52.9)	(47.1)
Segment Reconciling Items
Reconciling items to consolidated net income:
Interest expense	(27.2)		(27.2)	(54.2)	(54.1)
Depreciation expense	(25.4)		(21.8)	(51.8)	(42.1)
Amortization of purchased intangible assets	(18.7)		(17)	(37.4)	(34.6)
Net realized losses on investments and fair value changes to equity securities	(20)		(76.4)	(30.6)	(138.8)
Non-core operations (1)	(30.2)		(36.7)	(42.4)	(42.2)
Restructuring costs	1.3		(0.2)	(5.1)	(0.2)
Assurant Health runoff operations (2)	0		(0.5)	7.5	(0.5)
Other adjustments	1.4		(7.4)	(0.6)	(8.4)
Total reconciling items	(118.8)		(187.2)	(214.6)	(320.9)
Global Lifestyle | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA by segment:	197		221	395.9	447.7
Global Housing | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA by segment:	$ 154.6		$ 61	$ 223	$ 165.4

Segment Information - Schedul_2

Segment Information - Schedule of Net Earned Premiums, Fees and Other Income by Segment (Details) - Operating Segments - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Global Lifestyle
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	$ 2,108.9	$ 2,012.6	$ 4,149.2	$ 4,001.2
Global Lifestyle | Connected Living
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	1,079.2	1,070.2	2,105.8	2,147.6
Global Lifestyle | Global Automotive
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	1,029.7	942.4	2,043.4	1,853.6
Global Housing
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	536.6	466.4	1,041.9	923.7
Global Housing | Lender-placed Insurance
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	412.3	344.1	803.7	681.5
Global Housing | Renters and Other
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	$ 124.3	$ 122.3	$ 238.2	$ 242.2

Segment Information - Schedul_3

Segment Information - Schedule of Asset by Segment (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Assets	$ 33,104.7	$ 33,117.3
Non-core Operations
Segment Reporting Information [Line Items]
Assets	420.7	416.6
Corporate and Other
Segment Reporting Information [Line Items]
Assets	1,463.2	1,330.6
Global Lifestyle | Operating Segments
Segment Reporting Information [Line Items]
Assets	27,227.4	27,404.1
Global Housing | Operating Segments
Segment Reporting Information [Line Items]
Assets	$ 4,414.1	$ 4,382.6

Contract Revenues - Narrative (

Contract Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Global Lifestyle
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	$ 254.7	$ 290.3	$ 501.9	$ 568.3
Global Housing
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	20.9	21.2	40.8	43.2
Service contracts and sales
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	262.5		262.5		$ 271.7
Unearned revenue from contracts with customers	167.7		167.7		171.1
Contract with customer, liability, unearned revenue	20.6	$ 26.4	42.5	$ 49
Deferred upfront commissions and other costs	$ 54.9		$ 54.9		$ 61.4

Investments - Amortized Cost, A

Investments - Amortized Cost, Allowance for Credit Losses, Gross Unrealized Gains and Losses, and Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	$ 7,210.8	$ 6,920.8
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	27.1	21.2
Fixed maturity securities, gross unrealized losses	(620.1)	(658.3)
Fixed maturity securities, fair value	6,617.8	6,283.7
U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	72.9	92.9
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	0.2	0.2
Fixed maturity securities, gross unrealized losses	(5.7)	(6.7)
Fixed maturity securities, fair value	67.4	86.4
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	141.9	152.4
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	0.5	1.1
Fixed maturity securities, gross unrealized losses	(13.5)	(16)
Fixed maturity securities, fair value	128.9	137.5
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	458.4	416.2
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	4.1	0.6
Fixed maturity securities, gross unrealized losses	(17.3)	(20.5)
Fixed maturity securities, fair value	445.2	396.3
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	843.1	735.1
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	2.9	1.4
Fixed maturity securities, gross unrealized losses	(34.1)	(40.2)
Fixed maturity securities, fair value	811.9	696.3
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	407.8	458.6
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	0.1	0.2
Fixed maturity securities, gross unrealized losses	(57.5)	(56.5)
Fixed maturity securities, fair value	350.4	402.3
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	519.7	492.7
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	0.4	0.4
Fixed maturity securities, gross unrealized losses	(55.7)	(55.1)
Fixed maturity securities, fair value	464.4	438
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	3,332.2	3,265.1
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	13.7	13.9
Fixed maturity securities, gross unrealized losses	(298.4)	(317.9)
Fixed maturity securities, fair value	3,047.5	2,961.1
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities available for sale, amortized cost	1,434.8	1,307.8
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	5.2	3.4
Fixed maturity securities, gross unrealized losses	(137.9)	(145.4)
Fixed maturity securities, fair value	$ 1,302.1	$ 1,165.8

Investments - Narrative (Detail

Investments - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) investment	Dec. 31, 2022 USD ($) investment
Investment [Line Items]
Percentage of securities representing gross unrealized losses (as a percent)	11%	12%
Percentage of gross unrealized losses in a continuous loss position less than twelve months (as a percent)	15%	60%
Individual securities comprising total gross unrealized losses | investment	3,880	3,826
Percentage of residential mortgage-backed holdings exposure to sub-prime mortgage collateral (as a percent)	35%
Minimum
Investment [Line Items]
Total	$ 0.1	$ 0.1
Maximum
Investment [Line Items]
Total	$ 9.7	$ 9.7

Investments - Amortized Cost an

Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Cost or Amortized Cost
Due in one year or less, cost or amortized cost	$ 194.5
Due after one year through five years, cost or amortized cost	1,751.7
Due after five years through ten years, cost or amortized cost	2,461
Due after ten years, cost or amortized cost	1,033
Total, cost or amortized cost	5,440.2
Fixed maturity securities, cost or amortized cost	7,210.8	$ 6,920.8
Fair Value
Due in one year or less, fair value	192.8
Due after one year through five years, fair value	1,667.8
Due after five years through ten years, fair value	2,256.6
Due after ten years, fair value	873.9
Total, fair value	4,991.1
Fixed maturity securities, fair value	6,617.8	6,283.7
Commercial mortgage-backed
Cost or Amortized Cost
Cost or amortized cost	407.8
Fair Value
Fair value	350.4
Residential mortgage-backed
Cost or Amortized Cost
Cost or amortized cost	519.7
Fair Value
Fair value	464.4
Asset-backed
Cost or Amortized Cost
Cost or amortized cost	843.1
Fixed maturity securities, cost or amortized cost	843.1	735.1
Fair Value
Fair value	811.9
Fixed maturity securities, fair value	$ 811.9	$ 696.3

Investments - Net Realized Gain

Investments - Net Realized Gains (Losses), Including Impairment, Recognized in the Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Total net realized losses on investments related to sales and other and fair value changes to equity securities	$ (16.9)	$ (74.8)	$ (25)	$ (136.7)
Net realized losses related to impairments:
Other investments	(1)	0	(3.5)	0
Net realized losses related to impairments	(3.1)	(1.6)	(5.6)	(2.1)
Total net realized losses on investments and fair value changes to equity securities	(20)	(76.4)	(30.6)	(138.8)
Upward adjustment for equity securities under alternative measurement	0.4	9.5	0.4	19.5
Fixed maturity securities
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Total net realized losses on investments related to sales and other and fair value changes to equity securities	(7.8)	(22.6)	(11.8)	(41.1)
Net realized losses related to impairments:
Net realized losses related to impairments	(2.1)	(1.6)	(2.1)	(1.6)
Equity securities
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Total net realized losses on investments related to sales and other and fair value changes to equity securities	(9.8)	(54)	(12.9)	(97.2)
Commercial mortgage loans on real estate
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Total net realized losses on investments related to sales and other and fair value changes to equity securities	0.2	0	(1.3)	0.2
Other investments
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Total net realized losses on investments related to sales and other and fair value changes to equity securities	0.5	1.8	1	1.4
Net realized losses related to impairments:
Other investments	$ (1)	$ 0	$ (3.5)	$ (0.5)

Investments - Unrealized Gains

Investments - Unrealized Gains on Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Net losses recognized on equity securities	$ (9.8)	$ (54)	$ (12.9)	$ (97.2)
Less: Net realized (losses) gains related to sales of equity securities	(1.5)	8.4	(2.3)	20.2
Total fair value changes to equity securities held	(8.3)	(62.4)	(10.6)	(117.4)
Gain (Loss) on Securities [Line Items]
Equity securities at fair value	259.6		259.6		$ 281.3
Four Equity Positions that Went Public
Gain (Loss) on Securities [Line Items]
Equity securities, unrealized gain	2.2	$ 44.2	4.5	$ 77.9
Equity securities at fair value	$ 5.1		$ 5.1

Investments - Equity Securities

Investments - Equity Securities without Readily Determinable Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Investments, All Other Investments [Abstract]
Initial cost	$ 82.1	$ 81.7
Cumulative upward adjustments	51.2	50.8
Cumulative downward adjustments (including impairments)	(8.4)	(5)
Carrying value	$ 124.9	$ 127.5

Investments - Investment Catego

Investments - Investment Category and Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities (Details) - Fixed maturity securities - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	$ 2,324.6	$ 4,555.1
Fixed maturity securities, less than 12 months, unrealized losses	(94.2)	(395)
Fixed maturity securities, 12 months or more, fair value	3,415.1	1,160.3
Fixed maturity securities, 12 months or more, unrealized losses	(525.9)	(263.3)
Fixed maturity securities, total, fair value	5,739.7	5,715.4
Fixed maturity securities, unrealized losses	(620.1)	(658.3)
U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	19.9	58.5
Fixed maturity securities, less than 12 months, unrealized losses	(0.4)	(2.9)
Fixed maturity securities, 12 months or more, fair value	44.1	24.6
Fixed maturity securities, 12 months or more, unrealized losses	(5.3)	(3.8)
Fixed maturity securities, total, fair value	64	83.1
Fixed maturity securities, unrealized losses	(5.7)	(6.7)
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	37.7	77.4
Fixed maturity securities, less than 12 months, unrealized losses	(2)	(7.8)
Fixed maturity securities, 12 months or more, fair value	64.8	34.5
Fixed maturity securities, 12 months or more, unrealized losses	(11.5)	(8.2)
Fixed maturity securities, total, fair value	102.5	111.9
Fixed maturity securities, unrealized losses	(13.5)	(16)
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	95.3	268.5
Fixed maturity securities, less than 12 months, unrealized losses	(2.1)	(12.1)
Fixed maturity securities, 12 months or more, fair value	213.9	92.7
Fixed maturity securities, 12 months or more, unrealized losses	(15.2)	(8.4)
Fixed maturity securities, total, fair value	309.2	361.2
Fixed maturity securities, unrealized losses	(17.3)	(20.5)
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	156.9	378.2
Fixed maturity securities, less than 12 months, unrealized losses	(7.3)	(22)
Fixed maturity securities, 12 months or more, fair value	435.9	218.5
Fixed maturity securities, 12 months or more, unrealized losses	(26.8)	(18.2)
Fixed maturity securities, total, fair value	592.8	596.7
Fixed maturity securities, unrealized losses	(34.1)	(40.2)
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	96.4	290.7
Fixed maturity securities, less than 12 months, unrealized losses	(9.7)	(33.2)
Fixed maturity securities, 12 months or more, fair value	248.6	109.3
Fixed maturity securities, 12 months or more, unrealized losses	(47.8)	(23.3)
Fixed maturity securities, total, fair value	345	400
Fixed maturity securities, unrealized losses	(57.5)	(56.5)
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	200.7	371.3
Fixed maturity securities, less than 12 months, unrealized losses	(9.4)	(31.7)
Fixed maturity securities, 12 months or more, fair value	233.7	58.6
Fixed maturity securities, 12 months or more, unrealized losses	(46.3)	(23.4)
Fixed maturity securities, total, fair value	434.4	429.9
Fixed maturity securities, unrealized losses	(55.7)	(55.1)
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	1,292.9	2,266.6
Fixed maturity securities, less than 12 months, unrealized losses	(49.4)	(206.3)
Fixed maturity securities, 12 months or more, fair value	1,398.8	370.3
Fixed maturity securities, 12 months or more, unrealized losses	(249)	(111.6)
Fixed maturity securities, total, fair value	2,691.7	2,636.9
Fixed maturity securities, unrealized losses	(298.4)	(317.9)
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	424.8	843.9
Fixed maturity securities, less than 12 months, unrealized losses	(13.9)	(79)
Fixed maturity securities, 12 months or more, fair value	775.3	251.8
Fixed maturity securities, 12 months or more, unrealized losses	(124)	(66.4)
Fixed maturity securities, total, fair value	1,200.1	1,095.7
Fixed maturity securities, unrealized losses	$ (137.9)	$ (145.4)

Investments - Credit Quality In

Investments - Credit Quality Indicators (Details) - Commercial Portfolio Segment $ in Millions	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Greater than 2.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 24.2
Financing receivable, originated year one	24.9	11.7
Financing receivable, originated year two	11.6	0
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	0
Prior	48	50.8
Financing receivable, before allowance for credit loss	$ 84.5	$ 86.7
Percentage of financing receivable, before allowance for credit loss	0.276	0.292
1.5 to 2.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 13.9	$ 26.8
Financing receivable, originated year one	26.5	11.6
Financing receivable, originated year two	11.5	0
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	4.6
Prior	10.8	6.6
Financing receivable, before allowance for credit loss	$ 62.7	$ 49.6
Percentage of financing receivable, before allowance for credit loss	0.205	0.167
1.0 to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 6.2	$ 25.7
Financing receivable, originated year one	25.7	63
Financing receivable, originated year two	56.1	0
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	0
Prior	12.9	13.7
Financing receivable, before allowance for credit loss	$ 100.9	$ 102.4
Percentage of financing receivable, before allowance for credit loss	0.330	0.344
Less than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	49.2
Financing receivable, originated year two	49.7	2.7
Financing receivable, originated year three	2.8	0
Financing receivable, originated year four	0	0
Prior	5.2	6.8
Financing receivable, before allowance for credit loss	$ 57.7	$ 58.7
Percentage of financing receivable, before allowance for credit loss	0.189	0.197
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 20.1	$ 76.7
Financing receivable, originated year one	77.1	135.5
Financing receivable, originated year two	128.9	2.7
Financing receivable, originated year three	2.8	0
Financing receivable, originated year four	0	4.6
Prior	76.9	77.9
Financing receivable, before allowance for credit loss	$ 305.8	$ 297.4
Percentage of financing receivable, before allowance for credit loss	1	1
70% and less
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 17.6	$ 44
Financing receivable, originated year one	47.5	45.1
Financing receivable, originated year two	43	0
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	0
Prior	70.6	76
Financing receivable, before allowance for credit loss	$ 178.7	$ 165.1
Percentage of financing receivable, before allowance for credit loss	0.584	0.555
71% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 2.5	$ 32.7
Financing receivable, originated year one	29.6	75.7
Financing receivable, originated year two	68.2	2.7
Financing receivable, originated year three	2.8	0
Financing receivable, originated year four	0	4.6
Prior	4.5	0
Financing receivable, before allowance for credit loss	$ 107.6	$ 115.7
Percentage of financing receivable, before allowance for credit loss	0.352	0.389
81% to 95%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	14.7
Financing receivable, originated year two	17.7	0
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	0
Prior	1.8	0
Financing receivable, before allowance for credit loss	$ 19.5	$ 14.7
Percentage of financing receivable, before allowance for credit loss	0.064	0.050
Greater than 95%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	0
Financing receivable, originated year two	0	0
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	0
Prior	0	1.9
Financing receivable, before allowance for credit loss	$ 0	$ 1.9
Percentage of financing receivable, before allowance for credit loss	0	0.006
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 20.1	$ 76.7
Financing receivable, originated year one	77.1	135.5
Financing receivable, originated year two	128.9	2.7
Financing receivable, originated year three	2.8	0
Financing receivable, originated year four	0	4.6
Prior	76.9	77.9
Financing receivable, before allowance for credit loss	$ 305.8	$ 297.4
Percentage of financing receivable, before allowance for credit loss	1	1

Fair Value Disclosures - Fair V

Fair Value Disclosures - Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 7,944.3	$ 7,544.4
Other liabilities	66.7	75.3
Liabilities related to separate accounts	10.6	10.1
Total financial liabilities	77.3	85.4
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1,031.9	840.3
Other liabilities	66.7	60.1
Liabilities related to separate accounts	8	4.8
Total financial liabilities	74.7	64.9
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	6,789.9	6,607.3
Other liabilities	0	0.2
Liabilities related to separate accounts	2.6	5.3
Total financial liabilities	2.6	5.5
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	122.5	96.8
Other liabilities	0	15
Liabilities related to separate accounts	0	0
Total financial liabilities	0	15
U.S. government and government agencies and authorities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	67.4	86.4
U.S. government and government agencies and authorities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
U.S. government and government agencies and authorities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	67.4	86.4
U.S. government and government agencies and authorities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
States, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	128.9	137.5
States, municipalities and political subdivisions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
States, municipalities and political subdivisions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	128.9	137.5
States, municipalities and political subdivisions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Foreign governments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	445.2	396.3
Foreign governments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Foreign governments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	445.2	396.3
Foreign governments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	811.9	696.3
Asset-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Asset-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	733.1	635.9
Asset-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	78.8	60.4
Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	350.4	402.3
Commercial mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Commercial mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	350.4	402.3
Commercial mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Residential mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	464.4	438
Residential mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Residential mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	464.4	438
Residential mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
U.S. corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	3,047.5	2,961.1
U.S. corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
U.S. corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	3,011.7	2,932.3
U.S. corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	35.8	28.8
Foreign corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1,302.1	1,165.8
Foreign corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Foreign corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	1,294.4	1,158.4
Foreign corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	7.7	7.4
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	33.1	32.7
Mutual funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	33.1	32.7
Mutual funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Mutual funds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	19.4	23.9
Common Stock | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	18.7	23.2
Common Stock | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0.7	0.7
Common Stock | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Non-redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	207.1	224.7
Non-redeemable preferred stocks | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Non-redeemable preferred stocks | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	207.1	224.7
Non-redeemable preferred stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	230.8	119.9
Short-term investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	170.2	72.2
Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	60.6	47.7
Short-term investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	66.9	60.3
Other investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	66.7	60.1
Other investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Other investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0.2	0.2
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	755.7	789.1
Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	735.2	647.3
Cash equivalents | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	20.5	141.8
Cash equivalents | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	2.9
Other assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0
Other assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	2.9
Other assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0
Assets held in separate accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	10.6	10.1
Assets held in separate accounts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	8	4.8
Assets held in separate accounts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	2.6	5.3
Assets held in separate accounts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 0	$ 0

Fair Value Disclosures - Carryi

Fair Value Disclosures - Carrying Value and Fair Value of the Financial Instruments that are Not Recognized or are Not Carried at Fair Value (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	$ 7,944.3	$ 7,544.4
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	1,031.9	840.3
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	6,789.9	6,607.3
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total financial assets	122.5	96.8
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	302.7	295.6
Other investments	6.4	6.7
Other assets	16	12.7
Total financial assets	325.1	315
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	7.5	8
Funds withheld under reinsurance	376.2	366.6
Debt	2,129.4	2,129.9
Total financial liabilities	2,513.1	2,504.5
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	285.6	278.2
Other investments	6.4	6.7
Other assets	16	12.7
Total financial assets	308	297.6
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	7.8	8.4
Funds withheld under reinsurance	376.2	366.6
Debt	1,926.5	1,932.7
Total financial liabilities	2,310.5	2,307.7
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	0	0
Other investments	1.5	1.6
Other assets	0	0
Total financial assets	1.5	1.6
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	0	0
Funds withheld under reinsurance	376.2	366.6
Debt	0	0
Total financial liabilities	376.2	366.6
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	0	0
Other investments	0	0
Other assets	0	0
Total financial assets	0	0
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	0	0
Funds withheld under reinsurance	0	0
Debt	1,926.5	1,932.7
Total financial liabilities	1,926.5	1,932.7
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commercial mortgage loans on real estate	285.6	278.2
Other investments	4.9	5.1
Other assets	16	12.7
Total financial assets	306.5	296
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	7.8	8.4
Funds withheld under reinsurance	0	0
Debt	0	0
Total financial liabilities	$ 7.8	$ 8.4

Deferred Acquisition Costs - Sc

Deferred Acquisition Costs - Schedule of Deferred Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	$ 9,683	$ 9,025.4	$ 9,677.1	$ 8,811
Costs deferred	1,168.9	1,233.6	2,159.2	2,337.5
Amortization	(1,033.4)	(900)	(2,017.8)	(1,789.5)
Ending balance	$ 9,818.5	$ 9,359	$ 9,818.5	$ 9,359

Reserves - Roll Forward of Clai

Reserves - Roll Forward of Claims and Benefits Payable (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Claims and benefits payable, at beginning of period	$ 2,210	$ 1,523
Less: Reinsurance ceded and other	(1,228.8)	(744.1)
Net claims and benefits payable, at beginning of period	981.2	778.9
Incurred losses and loss adjustment expenses related to:
Current year	1,293.1	1,070.3
Prior years	(15)	19.7
Total incurred losses and loss adjustment expenses	1,278.1	1,090
Paid losses and loss adjustment expenses related to:
Current year	708.4	631.6
Prior years	438.6	383.5
Total paid losses and loss adjustment expenses	1,147	1,015.1
Net claims and benefits payable, at end of period	1,112.3	853.8
Plus: Reinsurance ceded and other	908	600.8
Claims and benefits payable, at end of period	2,020.3	1,454.6
Ceded to U.S. Government | Not Rated
Paid losses and loss adjustment expenses related to:
Reinsurance recoverables	$ 124.1	$ 56

Reserves - Narrative (Details)

Reserves - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		$ 15	$ (19.7)
Retroactive reinsurance treaty, coverage limit	$ 50	$ 50
Interest expense (original discount rate)	5.95%	5.95%	5.95%	5.95%
Current discount rate	5.10%	5.10%	3.40%	1.69%
Sharing Economy and Small Commercial
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		$ (30)	$ (48.8)
Sharing Economy
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		(30.9)
Small Commercial
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		0.9
Prior year claims and claims adjustment expense, retroactive reinsurance loss	$ 5	5
Global Lifestyle
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		21.5	43.5
Global Housing
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		22.3	(15.2)
Global Housing | Prior Catastrophe Event
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		(10)
Global Housing | Winter Storm Elliott
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		(8)
Global Housing | Non-catastrophe Losses
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		32.3
Global Housing | Non-catastrophe Losses | Lender-placed Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		26.8
Other Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Favorable (unfavorable) prior year development		$ 1.2	$ 0.8

Reserves - Balances of and Chan

Reserves - Balances of and Changes in Liability for Future Policy Benefits (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Present value of expected future policy benefits
Future policy benefits and expenses	$ 523.4	$ 507.9
Related reinsurance recoverable				$ 638.8
Net future policy benefits and expenses, after reinsurance recoverable				$ 0
Long-term Care Insurance Contracts
Present value of expected net premiums
Balance, beginning of period	34.2	37.1
Beginning balance at original discount rate	33.4	29.2
Effect of changes in cash flow assumptions		0	$ 9.4
Effect of actual variances from expected experience		3.3	(2.7)
Adjusted beginning of period balance		36.7	35.9
Experience variance	0	(0.3)
Interest accrual	0.9	4.6
Net premiums collected	(1.6)	(6.8)
Ending balance at original discount rate	36	33.4
Effect of changes in discount rate assumptions	1.8	0.8
Balance, end of period	37.8	34.2
Present value of expected future policy benefits
Balance, beginning of period	462.4	658.5
Beginning balance at original discount rate	444.4	430
Effect of changes in cash flow assumptions		0	12.3
Effect of actual variances from expected experience		4.3	(3.3)
Adjusted beginning of period balance		448.7	$ 439
Experience variance	(1)	(1.2)
Interest accrual	6.5	24.7
Benefit payments	(5.1)	(18.1)
Ending balance at original discount rate	449.1	444.4
Effect of changes in discount rate assumptions	35.8	18
Balance, end of period	484.9	462.4
Future policy benefits and expenses	447.1	428.2
Related reinsurance recoverable	447.1	428.2
Net future policy benefits and expenses, after reinsurance recoverable	$ 0	$ 0
Weighted-average liability duration of the future policy benefits and expenses (in years)	12 years 3 months 18 days	12 years 8 months 12 days

Reserves - Policyholder Account

Reserves - Policyholder Account Balances, Future Policy Benefits and Claims (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Future policy benefits and expenses	$ 523.4	$ 507.9
Long-term care
Liability for Claims and Claims Adjustment Expense [Line Items]
Future policy benefits and expenses	447.1	428.2
Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Future policy benefits and expenses	$ 76.3	$ 79.7

Reserves - Schedule of Undiscou

Reserves - Schedule of Undiscounted Expected Future Benefit Payments and Expected Gross Premiums (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Insurance [Abstract]
Expected future benefits payments	$ 837.3	$ 850
Expected future gross premiums	$ 72.5	$ 76.2

Reserves - Schedule of Gross Pr

Reserves - Schedule of Gross Premium and Interest Expense (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Insurance [Abstract]
Gross premiums	$ 1.6	$ 1.7
Interest expense (original discount rate)	$ 5.6	$ 5.3

Reserves - Schedule of Discount

Reserves - Schedule of Discount Rate (Details)	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2020
Insurance [Abstract]
Interest expense (original discount rate)	5.95%	5.95%	5.95%
Current discount rate	5.10%	3.40%	1.69%

Reserves - Impact of Adoption o

Reserves - Impact of Adoption on Long-term Care Insurance Contracts (Details) $ in Millions	Dec. 31, 2020 USD ($)
Present value of expected future policy benefits
Future policy benefits and expenses	$ 638.8
Less: reinsurance recoverable	(638.8)
Future Policy Benefits and Expenses, beginning of year January 1, 2021, net of reinsurance	0
As Reported
Present value of expected future policy benefits
Future policy benefits and expenses	386.4
Effect of the remeasurement of the liability at current discount rate
Present value of expected future policy benefits
Impact of adoption on the long-term care insurance contracts	250.8
Adjustment for loss contracts with NPR in excess of 100% under the modified retrospective approach
Present value of expected future policy benefits
Impact of adoption on the long-term care insurance contracts	$ 1.6

Reserves - Transition Effect on

Reserves - Transition Effect on Shareholders' Equity (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jan. 01, 2021
Liability for Future Policy Benefit, Activity [Line Items]
Retained earnings	$ 3,877.2	$ 3,699.3
Accumulated other comprehensive loss	$ (922.7)	$ (986.2)
Future Policy Benefits and Expenses
Liability for Future Policy Benefit, Activity [Line Items]
Retained earnings			$ (1.6)
Accumulated other comprehensive loss			$ (250.8)

Debt (Details)

Debt (Details) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended
	Feb. 28, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2019
Debt Instrument [Line Items]
Gain (Loss) on extinguishment of debt		$ 0		$ (900,000)	$ 100,000	$ (900,000)
Senior Notes 2026 | Senior Notes
Debt Instrument [Line Items]
Debt issuance amount	$ 175,000,000
Interest rate	6.10%
Debt instrument, discount rate	0.035%
Debt instrument, redemption price, percentage	100%
Senior Notes 2026 | Senior Notes | Interest Rate Derivatives
Debt Instrument [Line Items]
OCI cash flow hedge gain (loss) before reclassification							$ 1,400,000
Senior Notes 2023 | Senior Notes
Debt Instrument [Line Items]
Debt issuance amount			$ 225,000,000
Interest rate			4.20%
Redemption of debt, amount			$ 175,000,000
Gain (Loss) on extinguishment of debt			$ 100,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 4,396.4	$ 4,999	$ 4,228.7	$ 5,464.1
Change in accumulated other comprehensive income (loss) before reclassifications	(28.4)	(347.5)	58.6	(693.4)
Amounts reclassified from accumulated other comprehensive income (loss)	5.2	10.6	4.9	21.2
Total other comprehensive income (loss)	(23.2)	(336.9)	63.5	(672.2)
Ending balance	4,486	4,459.7	4,486	4,459.7
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(899.5)	(485.3)	(986.2)	(150)
Total other comprehensive income (loss)	(23.2)	(336.9)	63.5	(672.2)
Ending balance	(922.7)	(822.2)	(922.7)	(822.2)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(384)	(325.6)	(394)	(326.9)
Change in accumulated other comprehensive income (loss) before reclassifications	23.7	(41.9)	33.7	(40.6)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Total other comprehensive income (loss)	23.7	(41.9)	33.7	(40.6)
Ending balance	(360.3)	(367.5)	(360.3)	(367.5)
Net unrealized gains (losses) on investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(434)	(78.2)	(513.2)	256.6
Change in accumulated other comprehensive income (loss) before reclassifications	(54.8)	(305)	21.2	(652.8)
Amounts reclassified from accumulated other comprehensive income (loss)	7.9	13.1	11.1	26.1
Total other comprehensive income (loss)	(46.9)	(291.9)	32.3	(626.7)
Ending balance	(480.9)	(370.1)	(480.9)	(370.1)
Net unrealized gains on derivative transactions
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	9.9	11.8	9.8	12.4
Change in accumulated other comprehensive income (loss) before reclassifications	2.3	0	3.4	0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)	(0.7)	(1.2)	(1.3)
Total other comprehensive income (loss)	2.1	(0.7)	2.2	(1.3)
Ending balance	12	11.1	12	11.1
Unamortized net losses on Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(91.4)	(93.3)	(88.8)	(92.1)
Change in accumulated other comprehensive income (loss) before reclassifications	0.4	(0.6)	0.3	0
Amounts reclassified from accumulated other comprehensive income (loss)	(2.5)	(1.8)	(5)	(3.6)
Total other comprehensive income (loss)	(2.1)	(2.4)	(4.7)	(3.6)
Ending balance	$ (93.5)	$ (95.7)	$ (93.5)	$ (95.7)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized losses (gains) on investments	$ 20	$ 76.4	$ 30.6	$ 138.8
Provision for income taxes	48	17.7	81.5	43.9
Interest expense	27.2	27.2	54.2	54.1
Underwriting, selling, general and administrative expenses	1,867.6	1,811.7	3,690.8	3,602.3
Total reclassifications for the period, net of tax	5.2	10.6	4.9	21.2
Net unrealized losses (gains) on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	7.9	13.1	11.1	26.1
Net unrealized gains on derivative transactions
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(0.2)	(0.7)	(1.2)	(1.3)
Unamortized net losses on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(2.5)	(1.8)	(5)	(3.6)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	5.2	10.6	4.9	21.2
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized losses (gains) on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized losses (gains) on investments	10	16.6	14	33
Provision for income taxes	(2.1)	(3.5)	(2.9)	(6.9)
Net of tax	7.9	13.1	11.1	26.1
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains on derivative transactions
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	0.1	0.2	0.4	0.3
Net of tax	(0.2)	(0.7)	(1.2)	(1.3)
Interest expense	(0.7)	(0.9)	(2)	(1.6)
Underwriting, selling, general and administrative expenses	0.4	0	0.4	0
Reclassification out of Accumulated Other Comprehensive Income | Unamortized net losses on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(3.1)	(2.3)	(6.2)	(4.6)
Provision for income taxes	0.6	0.5	1.2	1
Total reclassifications for the period, net of tax	(2.5)	(1.8)	(5)	(3.6)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.3	1.1	0.6	2.2
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (3.4)	$ (3.4)	$ (6.8)	$ (6.8)

Earnings Per Common Share - Net

Earnings Per Common Share - Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator
Net income	$ 156.3	$ 52.2	$ 269.9	$ 201.2
Less: Common stock dividends paid	(39.7)	(38.6)	(76.7)	(76)
Undistributed earnings	116.6	13.6	193.2	125.2
Undistributed earnings	$ 116.6	$ 13.6	$ 193.2	$ 125.2
Denominator
Weighted average common shares outstanding used in basic per common share calculations (in shares)	53,745,611	54,607,321	53,619,711	55,190,104
Incremental common shares from:
Weighted average common shares outstanding used in diluted per common share calculations (in shares)	53,889,682	55,014,947	53,843,035	55,663,946
Basic
Distributed earnings (in dollars per share)	$ 0.74	$ 0.71	$ 1.43	$ 1.38
Undistributed earnings (in dollars per share)	2.17	0.25	3.60	2.27
Net income (in dollars per share)	2.91	0.96	5.03	3.65
Diluted
Distributed earnings (in dollars per share)	0.74	0.70	1.42	1.36
Undistributed earning (in dollars per share)	2.16	0.25	3.59	2.25
Net income (in dollars per share)	$ 2.90	$ 0.95	$ 5.01	$ 3.61
PSUs
Incremental common shares from:
Incremental common shares (in shares)	78,906	361,287	158,159	427,503
ESPP
Incremental common shares from:
Incremental common shares (in shares)	65,165	46,339	65,165	46,339

Earnings Per Common Share - Nar

Earnings Per Common Share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding anti-dilutive shares excluded from computation of diluted EPS (in shares)	58,380	82,222	60,766	48,673

Retirement and Other Employee_3

Retirement and Other Employee Benefits - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2020	Dec. 31, 2022	Feb. 29, 2020
Defined Benefit Plan Disclosure [Line Items]
Qualified pension benefits plan funded status	$ 95,500,000		$ 94,100,000
Funded status percentage	118%		117%
Cash contribution to qualified pension benefits plan	$ 0
Cash expected contribution to plan over remainder of fiscal year	$ 0
Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percentage)				1.55%
Reduction in obligations		$ 65,600,000

Retirement and Other Employee_4

Retirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan | Qualified Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 7	$ 4.2	$ 14	$ 8.4
Expected return on plan assets	(10.3)	(6.9)	(20.6)	(13.8)
Amortization of prior service credit	0	0	0	0
Amortization of net loss (gain)	0	0.7	0	1.5
Net periodic benefit cost	(3.3)	(2)	(6.6)	(3.9)
Pension Plan | Unfunded Nonqualified  Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.6	0.3	1.2	0.7
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	0	0	0	0
Amortization of net loss (gain)	0.3	0.6	0.6	1.1
Net periodic benefit cost	0.9	0.9	1.8	1.8
Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.1	0.2	0.1
Expected return on plan assets	(0.4)	(0.4)	(0.8)	(0.7)
Amortization of prior service credit	(3.4)	(3.4)	(6.8)	(6.8)
Amortization of net loss (gain)	0	(0.2)	0	(0.4)
Net periodic benefit cost	$ (3.7)	$ (3.9)	$ (7.4)	$ (7.8)

Restructuring and Related Imp_3

Restructuring and Related Impairment Charges (Summary of Restructuring and Related Costs) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Costs Incurred for Three Months Ended June 30, 2023	$ (1.3)	$ 5.1
Cumulative Costs Incurred Through December 31, 2022			$ 52.9
Estimated Remaining Costs	6.2	6.2
Estimated Total Costs	64.2	64.2
Transformational Plan
Restructuring Cost and Reserve [Line Items]
Costs Incurred for Three Months Ended June 30, 2023	(1.3)	(2.9)
Cumulative Costs Incurred Through December 31, 2022			31.7
Estimated Remaining Costs	6.2	6.2
Estimated Total Costs	35	35
Return to Work Strategy
Restructuring Cost and Reserve [Line Items]
Costs Incurred for Three Months Ended June 30, 2023	0	8
Cumulative Costs Incurred Through December 31, 2022			21.2
Estimated Remaining Costs	0	0
Estimated Total Costs	29.2	29.2
Severance and other employee benefits | Transformational Plan
Restructuring Cost and Reserve [Line Items]
Costs Incurred for Three Months Ended June 30, 2023	(1.3)	(2.9)
Cumulative Costs Incurred Through December 31, 2022			31.7
Estimated Remaining Costs	6.2	6.2
Estimated Total Costs	35	35
Contract exit costs | Return to Work Strategy
Restructuring Cost and Reserve [Line Items]
Costs Incurred for Three Months Ended June 30, 2023	0	4.9
Cumulative Costs Incurred Through December 31, 2022			15.5
Estimated Remaining Costs	0	0
Estimated Total Costs	20.4	20.4
Fixed asset impairment | Return to Work Strategy
Restructuring Cost and Reserve [Line Items]
Costs Incurred for Three Months Ended June 30, 2023	0	0
Cumulative Costs Incurred Through December 31, 2022			1.1
Estimated Remaining Costs	0	0
Estimated Total Costs	1.1	1.1
Right-of-use asset impairment | Return to Work Strategy
Restructuring Cost and Reserve [Line Items]
Costs Incurred for Three Months Ended June 30, 2023	0	3.1
Cumulative Costs Incurred Through December 31, 2022			$ 4.6
Estimated Remaining Costs	0	0
Estimated Total Costs	$ 7.7	$ 7.7

Restructuring and Related Imp_4

Restructuring and Related Impairment Charges (Rollforward of Accrued Liability) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Transformational Plan
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 29.3
Charges incurred	0
Non-cash adjustment	(2.9)
Cash payments	(13.4)
Restructuring reserve, ending balance	13
Return to Work Strategy
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	19.3
Charges incurred	4.9
Non-cash adjustment	0
Cash payments	(2.4)
Restructuring reserve, ending balance	$ 21.8

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 2.7	$ 2.7