Assurant (AIZ) 10-Q 8 Aug 24 2024 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2024	Aug. 02, 2024
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
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		51,793,255
Entity Central Index Key	0001267238
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
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, 2024	Dec. 31, 2023
Investments:
Fixed maturity securities available for sale, at fair value (amortized cost - $7,644.1 and $7,292.4 at June 30, 2024 and December 31, 2023, respectively)	$ 7,208.5	$ 6,912.1
Equity securities at fair value	226.3	223
Commercial mortgage loans on real estate, at amortized cost (net of allowances for credit losses of $6.2 and $4.0 at June 30, 2024 and December 31, 2023, respectively)	330.2	328.7
Short-term investments	254	258.1
Other investments	505.9	499
Total investments	8,524.9	8,220.9
Cash and cash equivalents	1,713.1	1,627.4
Premiums and accounts receivable (net of allowances for credit losses of $6.7 and $9.0 at June 30, 2024 and December 31, 2023, respectively)	1,814.8	2,265.6
Reinsurance recoverables (net of allowances for credit losses of $4.6 and $4.8 at June 30, 2024 and December 31, 2023, respectively)	6,727.9	6,649.2
Accrued investment income	119.9	97
Deferred acquisition costs	10,041	9,967.2
Property and equipment, net	732.6	685.8
Goodwill	2,618.4	2,608.8
Value of business acquired	20.8	83.9
Other intangible assets, net	555.1	567.1
Other assets (net of allowances for credit losses of $0.7 at June 30, 2024 and December 31, 2023)	904.5	862.3
Total assets	33,773	33,635.2
Liabilities
Future policy benefits and expenses	511.5	487.2
Unearned premiums	20,245.3	20,110.4
Claims and benefits payable	2,115.2	1,989.2
Commissions payable	511.7	542.8
Reinsurance balances payable	469	430.1
Funds held under reinsurance	322	392.7
Accounts payable and other liabilities (including allowances for credit losses of $5.2 and $8.3 at June 30, 2024 and December 31, 2023, respectively, for the unsecured portion of the high deductible recoverables)	2,512.2	2,792.7
Debt	2,081.8	2,080.6
Total liabilities	28,768.7	28,825.7
Commitments and contingencies (Note 14)
Stockholders’ equity
Common stock, par value $0.01 per share, 800,000,000 shares authorized, 54,139,539 and 54,252,083 shares issued and 51,843,450 and 51,955,994 shares outstanding at June 30, 2024 and December 31, 2023, respectively	0.5	0.6
Additional paid-in capital	1,669.6	1,668.5
Retained earnings	4,309.7	4,028.2
Accumulated other comprehensive loss	(852.7)	(765)
Treasury stock, at cost; 2,296,089 shares at June 30, 2024 and December 31, 2023	(122.8)	(122.8)
Total equity	5,004.3	4,809.5
Total liabilities and equity	$ 33,773	$ 33,635.2

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Fixed maturity securities available for sale, amortized cost	$ 7,644.1	$ 7,292.4
Commercial mortgage loans on real estate, allowances for expected credit losses	6.2	4
Premiums and accounts receivable, allowances for expected credit losses	6.7	9
Reinsurance recoverables, allowances for expected credit losses	4.6	4.8
Other assets, allowances for expected credit losses	0.7	0.7
Accounts payable and other liabilities, allowances for credit losses	$ 5.2	$ 8.3
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)	54,139,539	54,252,083
Common stock, shares outstanding (in shares)	51,843,450	51,955,994
Treasury stock, at cost (in shares)	2,296,089	2,296,089

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues
Net earned premiums	$ 2,444.6	$ 2,343	$ 4,821.1	$ 4,608.5
Fees and other income	375.2	295.7	760.9	578.4
Net investment income	124.7	112.9	251.4	218.1
Net realized losses on investments (including $3.8, $3.1, $11.8 and $5.6 of impairment-related losses for the three and six months ended June 30, 2024 and 2023, respectively) and fair value changes to equity securities	(19.6)	(20)	(28.4)	(30.6)
Total revenues	2,924.9	2,731.6	5,805	5,374.4
Benefits, losses and expenses
Policyholder benefits	696.1	632.5	1,319.2	1,278.1
Underwriting, selling, general and administrative expenses	1,969.2	1,867.6	3,906.5	3,690.8
Interest expense	26.7	27.2	53.5	54.2
Gain on extinguishment of debt	0	0	0	(0.1)
Total benefits, losses and expenses	2,692	2,527.3	5,279.2	5,023
Income before income tax expense	232.9	204.3	525.8	351.4
Income tax expense	44.2	48	100.7	81.5
Net income	$ 188.7	$ 156.3	$ 425.1	$ 269.9
Earnings Per Common Share
Basic (in dollars per share)	$ 3.59	$ 2.91	$ 8.09	$ 5.03
Diluted (in dollars per share)	$ 3.58	$ 2.90	$ 8.05	$ 5.01
Share Data
Weighted average common shares outstanding used in basic per common share calculations (in shares)	52,500,727	53,745,611	52,516,296	53,619,711
Plus: Dilutive securities (in shares)	217,009	144,071	298,660	223,324
Weighted average common shares outstanding used in diluted per common share calculations (in shares)	52,717,736	53,889,682	52,814,956	53,843,035

Consolidated Statements of Op_2

Consolidated Statements of Operations (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net realized losses on investments	$ 3.8	$ 3.1	$ 11.8	$ 5.6

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 188.7	$ 156.3	$ 425.1	$ 269.9
Other comprehensive income (loss):
Change in unrealized losses on securities, net of taxes of $9.6, $9.7, $13.8 and $(11.1) for the three and six months ended June 30, 2024 and 2023, respectively	(23)	(46.9)	(55.2)	32.3
Change in unrealized gains on derivative transactions, net of taxes of $0.2, $(0.6), $1.1 and $(0.6) for the three and six months ended June 30, 2024 and 2023, respectively	(0.9)	2.1	(4.1)	2.2
Change in foreign currency translation, net of taxes of $1.9, $(4.4), $1.8 and $(2.1) for the three and six months ended June 30, 2024 and 2023, respectively	(15.1)	23.7	(23.6)	33.7
Change in pension and postretirement unrecognized net periodic benefit cost, net of taxes of $0.6, $0.6, $1.3 and $1.3 for the three and six months ended June 30, 2024 and 2023, respectively	(2.5)	(2.1)	(4.8)	(4.7)
Total other comprehensive income (loss)	(41.5)	(23.2)	(87.7)	63.5
Total comprehensive income	$ 147.2	$ 133.1	$ 337.4	$ 333.4

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Change in unrealized losses on securities, tax	$ 9.6	$ 9.7	$ 13.8	$ (11.1)
Change in unrealized gains on derivative transactions, tax	0.2	(0.6)	1.1	(0.6)
Change in foreign currency transaction, tax	1.9	(4.4)	1.8	(2.1)
Change in pension and postretirement unrecognized net periodic benefit cost, tax	$ 0.6	$ 0.6	$ 1.3	$ 1.3

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 Loss	Treasury Stock
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)		(21.2)	(15.3)
Net income	269.9			269.9
Other comprehensive (loss) income	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 (loss) income	(23.2)				(23.2)
Ending balance at Jun. 30, 2023	4,486	0.6	1,653.7	3,877.2	(922.7)	(122.8)
Beginning balance at Dec. 31, 2023	4,809.5	0.6	1,668.5	4,028.2	(765)	(122.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan exercises	7.3		7.3
Stock plan compensation expense	34.6		34.6
Common stock dividends	(77.3)			(77.3)
Acquisition of common stock	(107.2)	(0.1)	(40.8)	(66.3)
Net income	425.1			425.1
Other comprehensive (loss) income	(87.7)				(87.7)
Ending balance at Jun. 30, 2024	5,004.3	0.5	1,669.6	4,309.7	(852.7)	(122.8)
Beginning balance at Mar. 31, 2024	4,920	0.6	1,659.2	4,194.2	(811.2)	(122.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock plan compensation expense	20.1		20.1
Common stock dividends	(39.9)			(39.9)
Acquisition of common stock	(43.1)	(0.1)	(9.7)	(33.3)
Net income	188.7			188.7
Other comprehensive (loss) income	(41.5)				(41.5)
Ending balance at Jun. 30, 2024	$ 5,004.3	$ 0.5	$ 1,669.6	$ 4,309.7	$ (852.7)	$ (122.8)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Stockholders' Equity [Abstract]
Common stock dividends (in dollars per share)	$ 0.72	$ 0.70	$ 1.44	$ 1.40

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities
Net income	$ 425.1	$ 269.9
Noncash revenues, expenses, gains and losses included in net income from operations:
Deferred tax expense (benefit)	22.5	(23.5)
Depreciation and amortization	101.1	95.3
Net realized losses on investments, including impairment losses	28.4	30.6
Gain on extinguishment of debt	0	(0.1)
Stock based compensation expense	34.6	29.7
Restructuring costs	1.2	5.1
Changes in operating assets and liabilities:
Insurance policy reserves and expenses	335.5	(134.4)
Premiums and accounts receivable	446	67.2
Commissions payable	(22.5)	(21.6)
Reinsurance recoverable	(61.3)	392.1
Reinsurance balance payable	42.1	(15.6)
Funds withheld under reinsurance	(69.7)	9
Deferred acquisition costs and value of business acquired	(43.6)	(16.3)
Taxes receivable	(150.1)	(21.7)
Other assets and other liabilities	(244.1)	(200.2)
Other	(51.8)	(20.5)
Net cash provided by operating activities	793.4	445
Sales of:
Fixed maturity securities available for sale	571.1	563.8
Equity securities	26.6	10.9
Other invested assets	60.1	13.9
Maturities, calls, prepayments, and scheduled redemption of:
Fixed maturity securities available for sale	237.4	123.9
Commercial mortgage loans on real estate	26.2	13.4
Purchases of:
Fixed maturity securities available for sale	(1,223.1)	(954.3)
Equity securities	(24.1)	(2.7)
Commercial mortgage loans on real estate	(30)	(21.8)
Other invested assets	(50.2)	(20)
Property and equipment and other	(106.2)	(97.8)
Subsidiaries, net of cash transferred	(12.1)	(0.3)
Change in short-term investments	2.6	(113.3)
Other	0.1	0.5
Net cash used in investing activities	(521.6)	(483.8)
Financing activities
Issuance of debt, net of issuance costs	0	173.2
Repayment of debt	0	(175)
Payment of contingent liability	0	(2.5)
Acquisition of common stock	(87.7)	(17.8)
Common stock dividends paid	(77.3)	(76.7)
Employee stock purchases and withholdings	(12)	(1.6)
Net cash used in financing activities	(177)	(100.4)
Effect of exchange rate changes on cash and cash equivalents	(9.1)	4.2
Change in cash and cash equivalents	85.7	(135)
Cash and cash equivalents at beginning of period	1,627.4	1,536.7
Cash and cash equivalents at end of period	$ 1,713.1	$ 1,401.7

Nature of Operations

Nature of Operations	6 Months Ended
	Jun. 30, 2024
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 contracts and related services for consumer electronics and appliances, and credit and other insurance products (referred to as “Connected Living”); and vehicle protection services, commercial equipment services and other related services (referred to as “Global Automotive”). Through its Global Housing segment, the Company provides lender-placed homeowners, manufactured housing and flood insurance, as well as voluntary manufactured housing, condominium and homeowners insurance (referred to as “Homeowners”); and renters insurance 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, 2024
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, 2024, 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, 2024 and 2023 and the consolidated statements of cash flows for the six months ended June 30, 2024 and 2023 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. Operating results for the three and six months ended June 30, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024. The accompanying unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Restricted Cash Restricted cash and cash equivalents of $55.7 million and $43.6 million as of June 30, 2024 and December 31, 2023, respectively, principally related to cash deposits involving insurance programs with restrictions as to withdrawal and use, are classified within cash and cash equivalents in the consolidated balance sheets.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2024
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. Adopted There were no ASUs adopted by the Company during the quarterly period ended June 30, 2024. Not Yet Adopted ASUs issued but not yet adopted as of June 30, 2024, that are currently being assessed and may or may not have a material impact on the Company’s consolidated financial statements or disclosures are included below. ASUs not listed below were assessed and either determined to be not applicable or are not expected to have a material impact on the Company’s consolidated financial statements or disclosures. Standard Summary of the Standard Effective date Impact of the Standard on the Company’s Financial Statements ASU 2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures The guidance improves reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. Key disclosure updates include: • On an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss. • On an annual and interim basis, an amount for other segment items by reportable segment and a description of its composition. The other segment items category is the difference between segment revenue less the significant expenses disclosed and each reported measure of segment profit or loss. • All current annual disclosures about a reportable segment’s profit or loss and assets currently required by Topic 280, Segment Reporting on an interim basis. • Clarify that if the CODM uses more than one measure of a segment’s profit or loss in assessing segment performance and deciding how to allocate resources, a public entity may report one or more of those additional measures of segment profit. However, at least one of the reported segment’s profit or loss measures (or the single reported measure, if only one is disclosed) should be the measure that is most consistent with the measurement principles used in measuring the corresponding amounts in the public entity’s consolidated financial statements. • Require the disclosure of the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. • Require that a public entity that has a single reportable segment provide all the disclosures required by the amendments in the ASU and all existing segment disclosures in Topic 280. The guidance is applied retrospectively to all periods presented in the financial statements, unless it is impracticable. December 31, 2024 and for interim periods thereafter The Company is assessing the impact of adopting this standard as of December 31, 2024. The amended guidance is expected to have no impact on the Company’s consolidated financial statements and to impact the Company’s segment information disclosures. Standard Summary of the Standard Effective date Impact of the Standard on the Company’s Financial Statements ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures The guidance improves the transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. It also includes certain other amendments to improve the effectiveness of income tax disclosures. January 1, 2025 (with early adoption permitted) The Company is assessing the adoption of this standard as of January 1, 2025. The amended guidance is expected to have no impact on the Company’s consolidated financial statements and insignificant impact on the Company’s income tax disclosures.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information As of June 30, 2024, the Company had two reportable operating segments, Global Lifestyle and Global Housing. In addition, the Company reports the Corporate and Other segment, which includes corporate employee-related expenses and activities of the holding company. 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, interest expense, provision (benefit) for income taxes, depreciation expense, amortization of purchased intangible assets, as well as other highly variable or unusual items. The following table presents segment Adjusted EBITDA with a reconciliation to net income: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Adjusted EBITDA by segment: Global Lifestyle $ 189.7 $ 197.0 $ 397.4 $ 395.9 Global Housing 160.9 154.6 353.4 223.0 Corporate and Other (27.2) (28.5) (56.7) (52.9) Reconciling items to consolidated net income: Interest expense (26.7) (27.2) (53.5) (54.2) Depreciation expense (30.0) (25.4) (60.6) (51.8) Amortization of purchased intangible assets (17.3) (18.7) (34.9) (37.4) Net realized losses on investments and fair value changes to equity securities (19.6) (20.0) (28.4) (30.6) Non-core operations (1) (3.7) (30.2) (6.3) (42.4) Restructuring costs (1.2) 1.3 (1.2) (5.1) Assurant Health runoff operations (2) — — 0.4 7.5 Other adjustments 8.0 1.4 16.2 (0.6) Total reconciling items (90.5) (118.8) (168.3) (214.6) Income before income tax expense 232.9 204.3 525.8 351.4 Income tax expense 44.2 48.0 100.7 81.5 Net income $ 188.7 $ 156.3 $ 425.1 $ 269.9 (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), certain legacy long-duration insurance policies and the Company’s operations in mainland China (not Hong Kong) (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 line of business are as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Global Lifestyle: Connected Living $ 1,148.5 $ 1,079.2 $ 2,288.8 $ 2,105.8 Global Automotive 1,035.0 1,029.7 2,082.5 2,043.4 Total $ 2,183.5 $ 2,108.9 $ 4,371.3 $ 4,149.2 Global Housing: Homeowners $ 512.7 $ 412.3 $ 960.1 $ 803.7 Renters and Other 120.9 124.3 245.7 238.2 Total $ 633.6 $ 536.6 $ 1,205.8 $ 1,041.9 The following table presents total assets by segment: June 30, 2024 December 31, 2023 Global Lifestyle (1) $ 27,233.0 $ 27,642.9 Global Housing (1) 4,440.4 4,274.5 Corporate and Other (2) 2,099.6 1,717.8 Segment assets $ 33,773.0 $ 33,635.2 (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. (2) Corporate and Other includes the Miami, Florida property with a carrying value of $46.0 million as of June 30, 2024 and December 31, 2023, which met held-for-sale criteria and was included in other assets. The Company 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. During third quarter 2023, the Company submitted an agreement to a potential acquiror, who subsequently withdrew in second quarter 2024. The Company intends to sell the property and, based on current market conditions and interest from multiple potential bidders, the Company has determined that the assets continue to meet held-for-sale criteria. There can be no assurance that a transaction will be entered into or consummated.

Contract Revenues

Contract Revenues	6 Months Ended
	Jun. 30, 2024
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 services 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 $314.3 million and $254.7 million for Global Lifestyle and $40.8 million and $20.9 million for Global Housing for the three months ended June 30, 2024 and 2023, respectively. The disaggregated revenues from service contracts included in fees and other income on the consolidated statements of operations are $659.5 million and $501.9 million for Global Lifestyle and $61.4 million and $40.8 million for Global Housing for the six months ended June 30, 2024 and 2023, 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 $205.6 million and $150.7 million, respectively, as of June 30, 2024, and $218.9 million and $155.4 million, respectively, as of December 31, 2023. 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, 2024 and 2023 that was included in unearned revenue as of December 31, 2023 and 2022 was $17.4 million and $20.6 million, respectively. Revenue from service contracts and sales of products recognized during the six months ended June 30, 2024 and 2023 that was included in unearned revenue as of December 31, 2023 and 2022 was $34.7 million and $42.5 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, 2024 and December 31, 2023, the Company had approximately $56.1 million and $47.2 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, 2024
Investments, Debt and Equity Securities [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, 2024 Cost or Amortized Cost Allowance for Credit Losses Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 62.9 $ — $ 0.2 $ (4.9) $ 58.2 States, municipalities and political subdivisions 145.4 — 0.7 (12.1) 134.0 Foreign governments 474.6 — 1.6 (20.5) 455.7 Asset-backed 961.1 — 8.6 (13.2) 956.5 Commercial mortgage-backed 343.7 — 0.6 (40.3) 304.0 Residential mortgage-backed 632.5 — 1.1 (56.4) 577.2 U.S. corporate 3,478.8 — 23.2 (241.5) 3,260.5 Foreign corporate 1,545.1 — 11.4 (94.1) 1,462.4 Total fixed maturity securities $ 7,644.1 $ — $ 47.4 $ (483.0) $ 7,208.5 December 31, 2023 Cost or Amortized Cost Allowance for Credit Losses Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 68.9 $ — $ 0.7 $ (4.4) $ 65.2 States, municipalities and political subdivisions 159.2 — 1.2 (11.2) 149.2 Foreign governments 483.1 — 9.4 (12.7) 479.8 Asset-backed 891.4 — 5.2 (22.8) 873.8 Commercial mortgage-backed 383.1 — 0.4 (53.3) 330.2 Residential mortgage-backed 534.7 — 1.9 (50.6) 486.0 U.S. corporate 3,300.5 — 45.3 (215.4) 3,130.4 Foreign corporate 1,471.5 — 17.6 (91.6) 1,397.5 Total fixed maturity securities $ 7,292.4 $ — $ 81.7 $ (462.0) $ 6,912.1 The cost or amortized cost and fair value of fixed maturity securities as of June 30, 2024 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 Amortized Cost Fair Value Due in one year or less $ 186.0 $ 185.4 Due after one year through five years 1,516.7 1,479.1 Due after five years through ten years 2,952.0 2,805.4 Due after ten years 1,052.1 900.9 Total 5,706.8 5,370.8 Asset-backed 961.1 956.5 Commercial mortgage-backed 343.7 304.0 Residential mortgage-backed 632.5 577.2 Total $ 7,644.1 $ 7,208.5 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, 2024 2023 2024 2023 Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities: Fixed maturity securities $ (14.8) $ (7.8) $ (29.2) $ (11.8) Equity securities (1) — (9.8) 10.1 (12.9) Commercial mortgage loans on real estate (1.3) 0.2 (2.3) (1.3) Other investments 0.3 0.5 4.8 1.0 Total net realized losses on investments related to sales and other and fair value changes to equity securities (15.8) (16.9) (16.6) (25.0) Net realized losses related to impairments: Fixed maturity securities (0.7) (2.1) (1.0) (2.1) Other investments (3.1) (1.0) (10.8) (3.5) Total net realized losses related to impairments (3.8) (3.1) (11.8) (5.6) Total net realized losses on investments and fair value changes to equity securities $ (19.6) $ (20.0) $ (28.4) $ (30.6) (1) Upward adjustments of $0.3 million, $4.1 million, $0.4 million and $0.4 million for the three and six months ended June 30, 2024 and 2023 and impairments of $3.1 million, $10.8 million, $1.0 million and $3.5 million for the three and six months ended June 30, 2024 and 2023, 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, 2024 2023 2024 2023 Net gains (losses) recognized on equity securities $ — $ (9.8) $ 10.1 $ (12.9) Less: Net realized gains (losses) related to sales of equity securities 5.2 (1.5) 5.1 (2.3) Total fair value changes to equity securities held $ (5.2) $ (8.3) $ 5.0 $ (10.6) 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, 2024 December 31, 2023 Initial cost $ 79.5 $ 86.8 Cumulative upward adjustments 55.1 51.1 Cumulative downward adjustments (including impairments) (18.4) (17.9) Carrying value $ 116.2 $ 120.0 The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of June 30, 2024 and December 31, 2023 were as follows: June 30, 2024 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 $ 9.6 $ (0.1) $ 40.7 $ (4.8) $ 50.3 $ (4.9) States, municipalities and political subdivisions 17.0 (0.4) 82.6 (11.7) 99.6 (12.1) Foreign governments 185.3 (4.0) 203.1 (16.5) 388.4 (20.5) Asset-backed 112.9 (3.7) 159.4 (9.5) 272.3 (13.2) Commercial mortgage-backed 40.8 (2.0) 215.9 (38.3) 256.7 (40.3) Residential mortgage-backed 178.6 (3.9) 281.3 (52.5) 459.9 (56.4) U.S. corporate 1,012.9 (29.2) 1,386.0 (212.3) 2,398.9 (241.5) Foreign corporate 388.8 (9.1) 658.4 (85.0) 1,047.2 (94.1) Total fixed maturity securities $ 1,945.9 $ (52.4) $ 3,027.4 $ (430.6) $ 4,973.3 $ (483.0) December 31, 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 $ 5.2 $ (0.1) $ 43.7 $ (4.3) $ 48.9 $ (4.4) States, municipalities and political subdivisions 3.9 (0.1) 96.5 (11.1) 100.4 (11.2) Foreign governments 42.5 (0.5) 203.5 (12.2) 246.0 (12.7) Asset-backed 64.0 (3.0) 404.7 (19.8) 468.7 (22.8) Commercial mortgage-backed 66.3 (8.4) 244.2 (44.9) 310.5 (53.3) Residential mortgage-backed 98.8 (3.5) 285.1 (47.1) 383.9 (50.6) U.S. corporate 331.9 (14.7) 1,596.4 (200.7) 1,928.3 (215.4) Foreign corporate 153.9 (5.6) 744.8 (86.0) 898.7 (91.6) Total fixed maturity securities $ 766.5 $ (35.9) $ 3,618.9 $ (426.1) $ 4,385.4 $ (462.0) Total gross unrealized losses represented approximately 10% and 11% of the aggregate fair value of the related securities as of June 30, 2024 and December 31, 2023, respectively. Approximately 11% and 8% of these gross unrealized losses had been in a continuous loss position for less than twelve months as of June 30, 2024 and December 31, 2023, respectively. The total gross unrealized losses are comprised of 3,317 and 3,096 individual securities as of June 30, 2024 and December 31, 2023, respectively. In accordance with its policy, the Company concluded that for these securities, the gross unrealized losses as of June 30, 2024 and December 31, 2023 were related to non-credit factors and therefore, did not recognize credit-related losses during the three and six months ended June 30, 2024. 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, 2024, approximately 34% of the outstanding principal balance of commercial mortgage loans was concentrated in the states of California, Texas 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 $5.0 million as of June 30, 2024, and from less than $0.1 million to $10.0 million as of December 31, 2023. 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, 2024 and December 31, 2023. June 30, 2024 Origination Year 2024 2023 2022 2021 2020 Prior Total % of Total Loan to value 70% and less $ 28.7 $ 49.6 $ 41.8 $ 25.8 $ — $ 61.7 $ 207.6 61.7 % 71% to 80% — 2.4 22.7 64.4 2.8 4.4 96.7 28.7 % 81% to 95% — — 8.9 12.6 — 5.3 26.8 8.0 % Greater than 95% — — 4.0 1.3 — — 5.3 1.6 % Total $ 28.7 $ 52.0 $ 77.4 $ 104.1 $ 2.8 $ 71.4 $ 336.4 100.0 % June 30, 2024 Origination Year 2024 2023 2022 2021 2020 Prior Total % of Total Debt-service coverage ratios (2): Greater than 2.0 $ 1.9 $ — $ 11.7 $ 9.2 $ — $ 43.7 $ 66.5 19.7 % 1.5 to 2.0 10.5 18.9 23.5 25.0 — 11.8 89.7 26.7 % 1.0 to 1.5 16.3 33.1 18.0 39.8 — 6.5 113.7 33.8 % Less than 1.0 — — 24.2 30.1 2.8 9.4 66.5 19.8 % Total $ 28.7 $ 52.0 $ 77.4 $ 104.1 $ 2.8 $ 71.4 $ 336.4 100.0 % December 31, 2023 Origination Year 2023 2022 2021 2020 2019 Prior Total % of Total Loan to value 70% and less $ 49.6 $ 42.3 $ 29.5 $ — $ — $ 60.1 $ 181.5 54.6 % 71% to 80% 2.5 22.7 69.6 2.8 — 4.4 102.0 30.7 % 81% to 95% — 10.7 25.5 — — 5.5 41.7 12.5 % Greater than 95% — 2.0 1.3 — — 4.1 7.4 2.2 % Total $ 52.1 $ 77.7 $ 125.9 $ 2.8 $ — $ 74.1 $ 332.6 100.0 % December 31, 2023 Origination Year 2023 2022 2021 2020 2019 Prior Total % of Total Debt-service coverage ratios (2): Greater than 2.0 $ — $ 11.8 $ 9.3 $ — $ — $ 44.9 $ 66.0 19.8 % 1.5 to 2.0 18.9 23.6 28.7 — — 12.2 83.4 25.1 % 1.0 to 1.5 33.2 18.2 40.1 — — 7.1 98.6 29.7 % Less than 1.0 — 24.1 47.8 2.8 — 9.9 84.6 25.4 % Total $ 52.1 $ 77.7 $ 125.9 $ 2.8 $ — $ 74.1 $ 332.6 100.0 % (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. (2)

Fair Value Disclosures

Fair Value Disclosures	6 Months Ended
	Jun. 30, 2024
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, 2024 and December 31, 2023. 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 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, 2024 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 58.2 $ — $ 58.2 $ — States, municipalities and political subdivisions 134.0 — 134.0 — Foreign governments 455.7 — 455.7 — Asset-backed 956.5 — 860.9 95.6 Commercial mortgage-backed 304.0 — 304.0 — Residential mortgage-backed 577.2 — 577.2 — U.S. corporate 3,260.5 — 3,215.2 45.3 Foreign corporate 1,462.4 — 1,452.4 10.0 Equity securities: Mutual funds 13.6 13.6 — — Common stocks 4.1 3.4 0.7 — Non-redeemable preferred stocks 208.6 — 208.6 — Short-term investments 211.1 190.4 (2) 20.7 (3) — Other investments 71.2 71.1 (1) — 0.1 (4) Cash equivalents 1,319.6 1,308.4 (2) 11.2 (3) — Other assets 9.1 — — 9.1 (4) Assets held in separate accounts 11.3 8.1 (1) 3.2 (3) — Total financial assets $ 9,057.1 $ 1,595.0 $ 7,302.0 $ 160.1 Financial Liabilities Other liabilities $ 71.1 $ 71.1 (1) $ — $ — Liabilities related to separate accounts 11.3 8.1 (1) 3.2 (3) — Total financial liabilities $ 82.4 $ 79.2 $ 3.2 $ — December 31, 2023 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 65.2 $ — $ 65.2 $ — States, municipalities and political subdivisions 149.2 — 149.2 — Foreign governments 479.8 — 479.8 — Asset-backed 873.8 — 791.0 82.8 Commercial mortgage-backed 330.2 — 330.2 — Residential mortgage-backed 486.0 — 486.0 — U.S. corporate 3,130.4 — 3,094.8 35.6 Foreign corporate 1,397.5 — 1,390.4 7.1 Equity securities: Mutual funds 16.6 16.6 — — Common stocks 17.9 17.2 0.7 — Non-redeemable preferred stocks 188.5 — 188.5 — Short-term investments 210.1 121.6 (2) 88.5 (3) — Other investments 62.5 62.4 (1) — 0.1 Cash equivalents 1,051.3 1,040.4 (2) 10.9 (3) — Other assets 15.8 — — 15.8 (4) Assets held in separate accounts 10.5 6.7 (1) 3.8 (3) — Total financial assets $ 8,485.3 $ 1,264.9 $ 7,079.0 $ 141.4 Financial Liabilities Other liabilities $ 64.2 $ 62.4 (1) $ 1.8 (4) $ — Liabilities related to separate accounts 10.5 6.7 (1) 3.8 (3) — Total financial liabilities $ 74.7 $ 69.1 $ 5.6 $ — (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. 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, 2024 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 330.2 $ 332.6 $ — $ — $ 332.6 Other investments 3.9 3.9 1.4 — 2.5 Other assets 19.3 19.3 — — 19.3 Total financial assets $ 353.4 $ 355.8 $ 1.4 $ — $ 354.4 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 6.9 $ 7.3 $ — $ — $ 7.3 Funds withheld under reinsurance 322.0 322.0 322.0 — — Debt 2,081.8 1,981.4 — 1,981.4 — Total financial liabilities $ 2,410.7 $ 2,310.7 $ 322.0 $ 1,981.4 $ 7.3 December 31, 2023 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 328.7 $ 313.7 $ — $ — $ 313.7 Other investments 3.7 3.7 1.4 — 2.3 Other assets 26.5 26.5 — — 26.5 Total financial assets $ 358.9 $ 343.9 $ 1.4 $ — $ 342.5 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 7.3 $ 7.8 $ — $ — $ 7.8 Funds withheld under reinsurance 392.7 392.7 392.7 — — Debt 2,080.6 1,972.4 — 1,972.4 — Total financial liabilities $ 2,480.6 $ 2,372.9 $ 392.7 $ 1,972.4 $ 7.8 (1)

Deferred Acquisition Costs

Deferred Acquisition Costs	6 Months Ended
	Jun. 30, 2024
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, 2024 2023 2024 2023 Beginning balance $ 9,978.9 $ 9,683.0 $ 9,967.2 $ 9,677.1 Costs deferred 1,077.4 1,168.9 2,111.8 2,159.2 Amortization (1,015.3) (1,033.4) (2,038.0) (2,017.8) Ending balance $ 10,041.0 $ 9,818.5 $ 10,041.0 $ 9,818.5

Reserves

Reserves	6 Months Ended
	Jun. 30, 2024
Insurance [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, 2024 2023 Claims and benefits payable, at beginning of period $ 1,989.2 $ 2,210.0 Less: Reinsurance ceded and other (886.6) (1,228.8) Net claims and benefits payable, at beginning of period 1,102.6 981.2 Incurred losses and loss adjustment expenses related to: Current year 1,384.2 1,293.1 Prior years (65.0) (15.0) Total incurred losses and loss adjustment expenses 1,319.2 1,278.1 Paid losses and loss adjustment expenses related to: Current year 731.5 708.4 Prior years 480.8 438.6 Total paid losses and loss adjustment expenses 1,212.3 1,147.0 Net claims and benefits payable, at end of period 1,209.5 1,112.3 Plus: Reinsurance ceded and other (1) 905.7 908.0 Claims and benefits payable, at end of period (1) $ 2,115.2 $ 2,020.3 (1) Includes reinsurance recoverables and claims and benefits payable of $104.0 million and $124.1 million as of June 30, 2024 and 2023, 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 $65.0 million and $15.0 million for the six months ended June 30, 2024 and 2023, respectively, as presented in the roll forward table above. Global Lifestyle contributed $17.0 million and $21.5 million in net favorable loss development for the six months ended June 30, 2024 and 2023, 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. Connected Living contributed $20.9 million of net favorable development, of which $11.7 million was from extended service contracts and mobile, and $9.2 million from credit and other insurance. For extended service contracts and mobile, improvements in data quality for certain clients allowed for reserve releases and contributed to the favorable development. The favorable development for credit and other insurance was primarily from Canada and Europe. Global Automotive contributed $3.9 million of net unfavorable development driven by higher claim frequencies as more vehicles meet the loss criteria in an asset protection product. For the six months ended June 30, 2023 the favorable development was also primarily from Connected Living and due to similar drivers. 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 $48.4 million of net favorable loss development for the six months ended June 30, 2024 and $22.3 million of net favorable loss development for the six months ended June 30, 2023. The net favorable loss development for the six months ended June 30, 2024 consisted of favorable non-catastrophe development of $46.6 million and $1.8 million net favorable development from prior catastrophe events. The favorable non-catastrophe development was driven by $35.1 million from lender-placed hazard primarily in accident year 2023 due to favorable frequency, easing inflation and legislative reform changes in Florida. The net favorable loss development for the six months ended June 30, 2023 was primarily attributable to favorable frequency and severity trends from lower than anticipated inflation, partially offset by unfavorable development on Winter Storm Elliott as a result of higher severity than initially projected. The sharing economy and small commercial businesses, reported within non-core operations, contributed $6.9 million and $30.0 million in net unfavorable loss development during the six months ended June 30, 2024 and 2023, respectively. The $6.9 million in net unfavorable loss development consisted of $8.4 million from sharing economy, driven by more newly reported claims than expected and an increase in the portion and amount of claims anticipated to exceed the per policy deductible. This was partially offset by $1.5 million in favorable loss development from small commercial due to the timing of reinsurance recoveries. The net unfavorable loss development for the six months ended June 30, 2023 was attributable primarily to reserve assumption increases in sharing economy related to higher frequency expectations for the number of claims closed with indemnity payment and an increase in loss adjustment expenses in the tail. All others contributed $6.5 million and $1.2 million of net favorable loss development for the six months ended June 30, 2024 and 2023 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. 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, 2024 December 31, 2023 Present value of expected net premiums Balance, beginning of period $ 36.4 $ 34.2 Beginning balance at original discount rate 36.5 33.4 Effect of changes in cash flow assumptions (1) — 1.5 Effect of actual variances from expected experience — 3.5 Adjusted beginning of period balance 36.5 38.4 Experience variance (2) (0.1) — Interest accrual 1.7 2.8 Net premiums collected (3.0) (4.7) Ending balance at original discount rate 35.1 36.5 Effect of changes in discount rate assumptions 1.3 (0.1) Balance, end of period $ 36.4 $ 36.4 Present value of expected future policy benefits Balance, beginning of period $ 450.6 $ 462.4 Beginning balance at original discount rate 453.0 444.4 Effect of actual variances from expected experience — 4.4 Adjusted beginning of period balance 453.0 448.8 Experience variance (2) (2.0) 1.0 Interest accrual 13.0 19.5 Benefit payments (12.6) (16.3) Ending balance at original discount rate 451.4 453.0 Effect of changes in discount rate assumptions 26.6 (2.4) Balance, end of period $ 478.0 $ 450.6 Net future policy benefits and expenses $ 441.6 $ 414.2 Related reinsurance recoverable 441.6 414.2 Net future policy benefits and expenses, after reinsurance recoverable $ — $ — Weighted-average liability duration of the future policy benefits and expenses (in years) 11.7 12.0 (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, 2023. (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, 2024 December 31, 2023 Long-term care $ 441.6 $ 414.2 Other 69.9 73.0 Total $ 511.5 $ 487.2 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, 2024 December 31, 2023 Expected future benefits payments $ 814.2 $ 829.3 Expected future gross premiums $ 64.7 $ 69.4 The following table presents the amount of long-term care revenue and interest recognized in the consolidated statements of operations: June 30, 2024 June 30, 2023 Gross premiums $ 1.5 $ 1.6 Interest expense (original discount rate) $ 5.7 $ 5.6 The following table presents the weighted-average interest rate for long-term care insurance contracts: June 30, 2024 June 30, 2023 Interest expense (original discount rate) 5.95 % 5.95 % Current discount rate 5.28 % 5.10 %

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2024
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, 2024 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at March 31, 2024 $ (360.4) $ (337.7) $ 5.3 $ (118.4) $ (811.2) Change in accumulated other comprehensive loss before reclassifications (15.1) (34.0) 1.6 — (47.5) Amounts reclassified from accumulated other comprehensive loss — 11.0 (2.5) (2.5) 6.0 Net current-period other comprehensive loss (15.1) (23.0) (0.9) (2.5) (41.5) Balance at June 30, 2024 $ (375.5) $ (360.7) $ 4.4 $ (120.9) $ (852.7) 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 loss before reclassifications 23.7 (54.8) 2.3 0.4 (28.4) Amounts reclassified from accumulated other comprehensive loss — 7.9 (0.2) (2.5) 5.2 Net current-period other comprehensive 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) Six Months Ended June 30, 2024 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at December 31, 2023 $ (351.9) $ (305.5) $ 8.5 $ (116.1) $ (765.0) Change in accumulated other comprehensive loss before reclassifications (23.6) (77.8) 1.5 — (99.9) Amounts reclassified from accumulated other comprehensive loss — 22.6 (5.6) (4.8) 12.2 Net current-period other comprehensive loss (23.6) (55.2) (4.1) (4.8) (87.7) Balance at June 30, 2024 $ (375.5) $ (360.7) $ 4.4 $ (120.9) $ (852.7) 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 loss before reclassifications 33.7 21.2 3.4 0.3 58.6 Amounts reclassified from accumulated other comprehensive loss — 11.1 (1.2) (5.0) 4.9 Net current-period other 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) The following tables summarize the reclassifications out of AOCI for the periods indicated: Details about accumulated other comprehensive income components Amount reclassified from accumulated other comprehensive income Affected line item in the statement where net income is presented Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Net unrealized losses on investments $ 13.9 $ 10.0 $ 28.6 $ 14.0 Net realized losses on investments and fair value changes to equity securities (2.9) (2.1) (6.0) (2.9) Provision for income taxes $ 11.0 $ 7.9 $ 22.6 $ 11.1 Net of tax Net unrealized (gains) losses on derivative transactions related to: Interest rate derivatives $ (0.7) $ (0.7) $ (1.4) $ (2.0) Interest expense Foreign exchange derivatives (2.5) 0.4 (5.7) 0.4 Underwriting, selling, general and administrative expenses (3.2) (0.3) (7.1) (1.6) 0.7 0.1 1.5 0.4 Provision for income taxes $ (2.5) $ (0.2) $ (5.6) $ (1.2) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.3 $ 0.3 $ 0.6 $ 0.6 (1) Amortization of prior service credit (3.5) (3.4) (6.8) (6.8) (1) (3.2) (3.1) (6.2) (6.2) 0.7 0.6 1.4 1.2 Provision for income taxes $ (2.5) $ (2.5) $ (4.8) $ (5.0) Net of tax Total reclassifications for the period $ 6.0 $ 5.2 $ 12.2 $ 4.9 Net of tax (1)

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2024
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, 2024 2023 2024 2023 Numerator Net income $ 188.7 $ 156.3 $ 425.1 $ 269.9 Less: Common stock dividends paid (39.9) (39.7) (77.3) (76.7) Undistributed earnings $ 148.8 $ 116.6 $ 347.8 $ 193.2 Denominator Weighted average common shares outstanding used in basic per common share calculations 52,500,727 53,745,611 52,516,296 53,619,711 Incremental common shares from: PSUs 167,770 78,906 249,421 158,159 ESPP 49,239 65,165 49,239 65,165 Weighted average common shares outstanding used in diluted per common share calculations 52,717,736 53,889,682 52,814,956 53,843,035 Earnings per common share – Basic Distributed earnings $ 0.76 $ 0.74 $ 1.47 $ 1.43 Undistributed earnings 2.83 2.17 6.62 3.60 Net income $ 3.59 $ 2.91 $ 8.09 $ 5.03 Earnings per common share – Diluted Distributed earnings $ 0.76 $ 0.74 $ 1.46 $ 1.42 Undistributed earnings 2.82 2.16 6.59 3.59 Net income $ 3.58 $ 2.90 $ 8.05 $ 5.01

Retirement and Other Employee B

Retirement and Other Employee Benefits	6 Months Ended
	Jun. 30, 2024
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 health care benefits for retired employees and their dependents (“Retirement Health Benefits”). 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 through 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, 2024 and 2023: 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, 2024 2023 2024 2023 2024 2023 Interest cost $ 6.6 $ 7.0 $ 0.5 $ 0.6 $ 0.1 $ 0.1 Expected return on plan assets (10.2) (10.3) — — (0.4) (0.4) Amortization of prior service credit — — — — (3.5) (3.4) Amortization of net loss — — 0.3 0.3 — — Net periodic benefit cost $ (3.6) $ (3.3) $ 0.8 $ 0.9 $ (3.8) $ (3.7) 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, 2024 2023 2024 2023 2024 2023 Interest cost $ 13.3 $ 14.0 $ 1.1 $ 1.2 $ 0.1 $ 0.2 Expected return on plan assets (20.2) (20.6) — — (0.7) (0.8) Amortization of prior service credit — — — — (6.8) (6.8) Amortization of net loss (gain) — — 0.6 0.6 — — Settlement loss — — — — — — Net periodic benefit cost $ (6.9) $ (6.6) $ 1.7 $ 1.8 $ (7.4) $ (7.4)

Restructuring and Related Impai

Restructuring and Related Impairment Charges	6 Months Ended
	Jun. 30, 2024
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”). In September 2023, the Company amended and extended the December 2022 plan to include additional actions within the initiatives described above, including further consolidation of its real estate portfolio and additional changes to its organizational structure. The Company now expects to be substantially complete with these actions by mid-2025. The following table summarizes the costs by major type that are recorded in underwriting, selling, general and administrative expenses in the consolidated statements of operations for the three and six months ended June 30, 2024 and 2023, 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, Costs Incurred for Six Months Ended June 30, Estimated Remaining Costs Estimated Total Costs 2024 2023 2024 2023 Transformational plan: Severance and other employee benefits $ 0.3 $ (1.3) $ 0.3 $ (2.9) $ 3.2 $ 56.2 Total transformational plan 0.3 (1.3) 0.3 (2.9) 3.2 56.2 Return to work strategy: Contract exit costs 0.9 — 0.9 4.9 — 22.9 Fixed asset impairment — — — — — 2.3 Right-of-use asset impairment — — — 3.1 — 10.2 Total return to work strategy 0.9 — 0.9 8.0 — 35.4 Total restructuring and impairment charges $ 1.2 $ (1.3) $ 1.2 $ 5.1 $ 3.2 $ 91.6 The following table shows the rollforward of the accrued liability by major type. Transformational Plan Return to Work Strategy (contract exit costs) Balance at January 1, 2024 $ 27.8 $ 17.1 Charges incurred 0.3 1.1 Non-cash adjustment — (0.2) Cash payments (13.9) (4.7) Balance at June 30, 2024 $ 14.2 $ 13.3

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2024
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 $1.8 million and $2.9 million of letters of credit outstanding as of June 30, 2024 and December 31, 2023, 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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pay vs Performance Disclosure
Net income	$ 188.7	$ 156.3	$ 425.1	$ 269.9

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Jun. 30, 2024
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, 2024
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, 2024, 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, 2024 and 2023 and the consolidated statements of cash flows for the six months ended June 30, 2024 and 2023 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.
Restricted Cash	Restricted Cash Restricted cash and cash equivalents of $55.7 million and $43.6 million as of June 30, 2024 and December 31, 2023, respectively, principally related to cash deposits involving insurance programs with restrictions as to withdrawal and use, are classified within cash and cash equivalents in the consolidated balance sheets.
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. Adopted There were no ASUs adopted by the Company during the quarterly period ended June 30, 2024. Not Yet Adopted ASUs issued but not yet adopted as of June 30, 2024, that are currently being assessed and may or may not have a material impact on the Company’s consolidated financial statements or disclosures are included below. ASUs not listed below were assessed and either determined to be not applicable or are not expected to have a material impact on the Company’s consolidated financial statements or disclosures. Standard Summary of the Standard Effective date Impact of the Standard on the Company’s Financial Statements ASU 2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures The guidance improves reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. Key disclosure updates include: • On an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss. • On an annual and interim basis, an amount for other segment items by reportable segment and a description of its composition. The other segment items category is the difference between segment revenue less the significant expenses disclosed and each reported measure of segment profit or loss. • All current annual disclosures about a reportable segment’s profit or loss and assets currently required by Topic 280, Segment Reporting on an interim basis. • Clarify that if the CODM uses more than one measure of a segment’s profit or loss in assessing segment performance and deciding how to allocate resources, a public entity may report one or more of those additional measures of segment profit. However, at least one of the reported segment’s profit or loss measures (or the single reported measure, if only one is disclosed) should be the measure that is most consistent with the measurement principles used in measuring the corresponding amounts in the public entity’s consolidated financial statements. • Require the disclosure of the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. • Require that a public entity that has a single reportable segment provide all the disclosures required by the amendments in the ASU and all existing segment disclosures in Topic 280. The guidance is applied retrospectively to all periods presented in the financial statements, unless it is impracticable. December 31, 2024 and for interim periods thereafter The Company is assessing the impact of adopting this standard as of December 31, 2024. The amended guidance is expected to have no impact on the Company’s consolidated financial statements and to impact the Company’s segment information disclosures. Standard Summary of the Standard Effective date Impact of the Standard on the Company’s Financial Statements ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures The guidance improves the transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. It also includes certain other amendments to improve the effectiveness of income tax disclosures. January 1, 2025 (with early adoption permitted) The Company is assessing the adoption of this standard as of January 1, 2025. The amended guidance is expected to have no impact on the Company’s consolidated financial statements and insignificant impact on the Company’s income tax disclosures.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2024
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, 2024 2023 2024 2023 Adjusted EBITDA by segment: Global Lifestyle $ 189.7 $ 197.0 $ 397.4 $ 395.9 Global Housing 160.9 154.6 353.4 223.0 Corporate and Other (27.2) (28.5) (56.7) (52.9) Reconciling items to consolidated net income: Interest expense (26.7) (27.2) (53.5) (54.2) Depreciation expense (30.0) (25.4) (60.6) (51.8) Amortization of purchased intangible assets (17.3) (18.7) (34.9) (37.4) Net realized losses on investments and fair value changes to equity securities (19.6) (20.0) (28.4) (30.6) Non-core operations (1) (3.7) (30.2) (6.3) (42.4) Restructuring costs (1.2) 1.3 (1.2) (5.1) Assurant Health runoff operations (2) — — 0.4 7.5 Other adjustments 8.0 1.4 16.2 (0.6) Total reconciling items (90.5) (118.8) (168.3) (214.6) Income before income tax expense 232.9 204.3 525.8 351.4 Income tax expense 44.2 48.0 100.7 81.5 Net income $ 188.7 $ 156.3 $ 425.1 $ 269.9 (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), certain legacy long-duration insurance policies and the Company’s operations in mainland China (not Hong Kong) (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 following table presents total assets by segment: June 30, 2024 December 31, 2023 Global Lifestyle (1) $ 27,233.0 $ 27,642.9 Global Housing (1) 4,440.4 4,274.5 Corporate and Other (2) 2,099.6 1,717.8 Segment assets $ 33,773.0 $ 33,635.2 (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. (2) Corporate and Other includes the Miami, Florida property with a carrying value of $46.0 million as of June 30, 2024 and December 31, 2023, which met held-for-sale criteria and was included in other assets. The Company 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. During third quarter 2023, the Company submitted an agreement to a potential acquiror, who subsequently withdrew in second quarter 2024. The Company intends to sell the property and, based on current market conditions and interest from multiple potential bidders, the Company has determined that the assets continue to meet held-for-sale criteria. There can be no assurance that a transaction will be entered into or consummated.
Schedule of Net Earned Premiums by Segment and Product	The Company’s net earned premiums, fees and other income by segment and line of business are as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Global Lifestyle: Connected Living $ 1,148.5 $ 1,079.2 $ 2,288.8 $ 2,105.8 Global Automotive 1,035.0 1,029.7 2,082.5 2,043.4 Total $ 2,183.5 $ 2,108.9 $ 4,371.3 $ 4,149.2 Global Housing: Homeowners $ 512.7 $ 412.3 $ 960.1 $ 803.7 Renters and Other 120.9 124.3 245.7 238.2 Total $ 633.6 $ 536.6 $ 1,205.8 $ 1,041.9

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost, Gross Unrealized Gains and Losses, Fair Value of Fixed Maturity Security	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, 2024 Cost or Amortized Cost Allowance for Credit Losses Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 62.9 $ — $ 0.2 $ (4.9) $ 58.2 States, municipalities and political subdivisions 145.4 — 0.7 (12.1) 134.0 Foreign governments 474.6 — 1.6 (20.5) 455.7 Asset-backed 961.1 — 8.6 (13.2) 956.5 Commercial mortgage-backed 343.7 — 0.6 (40.3) 304.0 Residential mortgage-backed 632.5 — 1.1 (56.4) 577.2 U.S. corporate 3,478.8 — 23.2 (241.5) 3,260.5 Foreign corporate 1,545.1 — 11.4 (94.1) 1,462.4 Total fixed maturity securities $ 7,644.1 $ — $ 47.4 $ (483.0) $ 7,208.5 December 31, 2023 Cost or Amortized Cost Allowance for Credit Losses Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: U.S. government and government agencies and authorities $ 68.9 $ — $ 0.7 $ (4.4) $ 65.2 States, municipalities and political subdivisions 159.2 — 1.2 (11.2) 149.2 Foreign governments 483.1 — 9.4 (12.7) 479.8 Asset-backed 891.4 — 5.2 (22.8) 873.8 Commercial mortgage-backed 383.1 — 0.4 (53.3) 330.2 Residential mortgage-backed 534.7 — 1.9 (50.6) 486.0 U.S. corporate 3,300.5 — 45.3 (215.4) 3,130.4 Foreign corporate 1,471.5 — 17.6 (91.6) 1,397.5 Total fixed maturity securities $ 7,292.4 $ — $ 81.7 $ (462.0) $ 6,912.1
Schedule of 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, 2024 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 Amortized Cost Fair Value Due in one year or less $ 186.0 $ 185.4 Due after one year through five years 1,516.7 1,479.1 Due after five years through ten years 2,952.0 2,805.4 Due after ten years 1,052.1 900.9 Total 5,706.8 5,370.8 Asset-backed 961.1 956.5 Commercial mortgage-backed 343.7 304.0 Residential mortgage-backed 632.5 577.2 Total $ 7,644.1 $ 7,208.5
Schedule of Gain (Loss) on Securities	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, 2024 2023 2024 2023 Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities: Fixed maturity securities $ (14.8) $ (7.8) $ (29.2) $ (11.8) Equity securities (1) — (9.8) 10.1 (12.9) Commercial mortgage loans on real estate (1.3) 0.2 (2.3) (1.3) Other investments 0.3 0.5 4.8 1.0 Total net realized losses on investments related to sales and other and fair value changes to equity securities (15.8) (16.9) (16.6) (25.0) Net realized losses related to impairments: Fixed maturity securities (0.7) (2.1) (1.0) (2.1) Other investments (3.1) (1.0) (10.8) (3.5) Total net realized losses related to impairments (3.8) (3.1) (11.8) (5.6) Total net realized losses on investments and fair value changes to equity securities $ (19.6) $ (20.0) $ (28.4) $ (30.6) (1) Upward adjustments of $0.3 million, $4.1 million, $0.4 million and $0.4 million for the three and six months ended June 30, 2024 and 2023 and impairments of $3.1 million, $10.8 million, $1.0 million and $3.5 million for the three and six months ended June 30, 2024 and 2023, respectively, were realized on equity investments accounted for under the measurement alternative.
Schedule of Fair Value Changes to 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, 2024 2023 2024 2023 Net gains (losses) recognized on equity securities $ — $ (9.8) $ 10.1 $ (12.9) Less: Net realized gains (losses) related to sales of equity securities 5.2 (1.5) 5.1 (2.3) Total fair value changes to equity securities held $ (5.2) $ (8.3) $ 5.0 $ (10.6)
Schedule of Equity Securities without Readily Determinable Fair Value	The following table summarizes information related to these investments: June 30, 2024 December 31, 2023 Initial cost $ 79.5 $ 86.8 Cumulative upward adjustments 55.1 51.1 Cumulative downward adjustments (including impairments) (18.4) (17.9) Carrying value $ 116.2 $ 120.0
Schedule of Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities	The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of June 30, 2024 and December 31, 2023 were as follows: June 30, 2024 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 $ 9.6 $ (0.1) $ 40.7 $ (4.8) $ 50.3 $ (4.9) States, municipalities and political subdivisions 17.0 (0.4) 82.6 (11.7) 99.6 (12.1) Foreign governments 185.3 (4.0) 203.1 (16.5) 388.4 (20.5) Asset-backed 112.9 (3.7) 159.4 (9.5) 272.3 (13.2) Commercial mortgage-backed 40.8 (2.0) 215.9 (38.3) 256.7 (40.3) Residential mortgage-backed 178.6 (3.9) 281.3 (52.5) 459.9 (56.4) U.S. corporate 1,012.9 (29.2) 1,386.0 (212.3) 2,398.9 (241.5) Foreign corporate 388.8 (9.1) 658.4 (85.0) 1,047.2 (94.1) Total fixed maturity securities $ 1,945.9 $ (52.4) $ 3,027.4 $ (430.6) $ 4,973.3 $ (483.0) December 31, 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 $ 5.2 $ (0.1) $ 43.7 $ (4.3) $ 48.9 $ (4.4) States, municipalities and political subdivisions 3.9 (0.1) 96.5 (11.1) 100.4 (11.2) Foreign governments 42.5 (0.5) 203.5 (12.2) 246.0 (12.7) Asset-backed 64.0 (3.0) 404.7 (19.8) 468.7 (22.8) Commercial mortgage-backed 66.3 (8.4) 244.2 (44.9) 310.5 (53.3) Residential mortgage-backed 98.8 (3.5) 285.1 (47.1) 383.9 (50.6) U.S. corporate 331.9 (14.7) 1,596.4 (200.7) 1,928.3 (215.4) Foreign corporate 153.9 (5.6) 744.8 (86.0) 898.7 (91.6) Total fixed maturity securities $ 766.5 $ (35.9) $ 3,618.9 $ (426.1) $ 4,385.4 $ (462.0)
Schedule of Credit Quality Indicators for Commercial Mortgage Loans	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, 2024 and December 31, 2023. June 30, 2024 Origination Year 2024 2023 2022 2021 2020 Prior Total % of Total Loan to value 70% and less $ 28.7 $ 49.6 $ 41.8 $ 25.8 $ — $ 61.7 $ 207.6 61.7 % 71% to 80% — 2.4 22.7 64.4 2.8 4.4 96.7 28.7 % 81% to 95% — — 8.9 12.6 — 5.3 26.8 8.0 % Greater than 95% — — 4.0 1.3 — — 5.3 1.6 % Total $ 28.7 $ 52.0 $ 77.4 $ 104.1 $ 2.8 $ 71.4 $ 336.4 100.0 % June 30, 2024 Origination Year 2024 2023 2022 2021 2020 Prior Total % of Total Debt-service coverage ratios (2): Greater than 2.0 $ 1.9 $ — $ 11.7 $ 9.2 $ — $ 43.7 $ 66.5 19.7 % 1.5 to 2.0 10.5 18.9 23.5 25.0 — 11.8 89.7 26.7 % 1.0 to 1.5 16.3 33.1 18.0 39.8 — 6.5 113.7 33.8 % Less than 1.0 — — 24.2 30.1 2.8 9.4 66.5 19.8 % Total $ 28.7 $ 52.0 $ 77.4 $ 104.1 $ 2.8 $ 71.4 $ 336.4 100.0 % December 31, 2023 Origination Year 2023 2022 2021 2020 2019 Prior Total % of Total Loan to value 70% and less $ 49.6 $ 42.3 $ 29.5 $ — $ — $ 60.1 $ 181.5 54.6 % 71% to 80% 2.5 22.7 69.6 2.8 — 4.4 102.0 30.7 % 81% to 95% — 10.7 25.5 — — 5.5 41.7 12.5 % Greater than 95% — 2.0 1.3 — — 4.1 7.4 2.2 % Total $ 52.1 $ 77.7 $ 125.9 $ 2.8 $ — $ 74.1 $ 332.6 100.0 % December 31, 2023 Origination Year 2023 2022 2021 2020 2019 Prior Total % of Total Debt-service coverage ratios (2): Greater than 2.0 $ — $ 11.8 $ 9.3 $ — $ — $ 44.9 $ 66.0 19.8 % 1.5 to 2.0 18.9 23.6 28.7 — — 12.2 83.4 25.1 % 1.0 to 1.5 33.2 18.2 40.1 — — 7.1 98.6 29.7 % Less than 1.0 — 24.1 47.8 2.8 — 9.9 84.6 25.4 % Total $ 52.1 $ 77.7 $ 125.9 $ 2.8 $ — $ 74.1 $ 332.6 100.0 % (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. (2)

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	6 Months Ended
	Jun. 30, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis	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, 2024 and December 31, 2023. 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 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, 2024 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 58.2 $ — $ 58.2 $ — States, municipalities and political subdivisions 134.0 — 134.0 — Foreign governments 455.7 — 455.7 — Asset-backed 956.5 — 860.9 95.6 Commercial mortgage-backed 304.0 — 304.0 — Residential mortgage-backed 577.2 — 577.2 — U.S. corporate 3,260.5 — 3,215.2 45.3 Foreign corporate 1,462.4 — 1,452.4 10.0 Equity securities: Mutual funds 13.6 13.6 — — Common stocks 4.1 3.4 0.7 — Non-redeemable preferred stocks 208.6 — 208.6 — Short-term investments 211.1 190.4 (2) 20.7 (3) — Other investments 71.2 71.1 (1) — 0.1 (4) Cash equivalents 1,319.6 1,308.4 (2) 11.2 (3) — Other assets 9.1 — — 9.1 (4) Assets held in separate accounts 11.3 8.1 (1) 3.2 (3) — Total financial assets $ 9,057.1 $ 1,595.0 $ 7,302.0 $ 160.1 Financial Liabilities Other liabilities $ 71.1 $ 71.1 (1) $ — $ — Liabilities related to separate accounts 11.3 8.1 (1) 3.2 (3) — Total financial liabilities $ 82.4 $ 79.2 $ 3.2 $ — December 31, 2023 Total Level 1 Level 2 Level 3 Financial Assets Fixed maturity securities: U.S. government and government agencies and authorities $ 65.2 $ — $ 65.2 $ — States, municipalities and political subdivisions 149.2 — 149.2 — Foreign governments 479.8 — 479.8 — Asset-backed 873.8 — 791.0 82.8 Commercial mortgage-backed 330.2 — 330.2 — Residential mortgage-backed 486.0 — 486.0 — U.S. corporate 3,130.4 — 3,094.8 35.6 Foreign corporate 1,397.5 — 1,390.4 7.1 Equity securities: Mutual funds 16.6 16.6 — — Common stocks 17.9 17.2 0.7 — Non-redeemable preferred stocks 188.5 — 188.5 — Short-term investments 210.1 121.6 (2) 88.5 (3) — Other investments 62.5 62.4 (1) — 0.1 Cash equivalents 1,051.3 1,040.4 (2) 10.9 (3) — Other assets 15.8 — — 15.8 (4) Assets held in separate accounts 10.5 6.7 (1) 3.8 (3) — Total financial assets $ 8,485.3 $ 1,264.9 $ 7,079.0 $ 141.4 Financial Liabilities Other liabilities $ 64.2 $ 62.4 (1) $ 1.8 (4) $ — Liabilities related to separate accounts 10.5 6.7 (1) 3.8 (3) — Total financial liabilities $ 74.7 $ 69.1 $ 5.6 $ — (1) Primarily includes mutual funds and related obligations. (2) Primarily includes money market funds. (3) Primarily includes fixed maturity securities and related obligations. (4)
Schedule of 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, 2024 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 330.2 $ 332.6 $ — $ — $ 332.6 Other investments 3.9 3.9 1.4 — 2.5 Other assets 19.3 19.3 — — 19.3 Total financial assets $ 353.4 $ 355.8 $ 1.4 $ — $ 354.4 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 6.9 $ 7.3 $ — $ — $ 7.3 Funds withheld under reinsurance 322.0 322.0 322.0 — — Debt 2,081.8 1,981.4 — 1,981.4 — Total financial liabilities $ 2,410.7 $ 2,310.7 $ 322.0 $ 1,981.4 $ 7.3 December 31, 2023 Fair Value Carrying Total Level 1 Level 2 Level 3 Financial Assets Commercial mortgage loans on real estate $ 328.7 $ 313.7 $ — $ — $ 313.7 Other investments 3.7 3.7 1.4 — 2.3 Other assets 26.5 26.5 — — 26.5 Total financial assets $ 358.9 $ 343.9 $ 1.4 $ — $ 342.5 Financial Liabilities Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) $ 7.3 $ 7.8 $ — $ — $ 7.8 Funds withheld under reinsurance 392.7 392.7 392.7 — — Debt 2,080.6 1,972.4 — 1,972.4 — Total financial liabilities $ 2,480.6 $ 2,372.9 $ 392.7 $ 1,972.4 $ 7.8 (1)

Deferred Acquisition Costs (Tab

Deferred Acquisition Costs (Tables)	6 Months Ended
	Jun. 30, 2024
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, 2024 2023 2024 2023 Beginning balance $ 9,978.9 $ 9,683.0 $ 9,967.2 $ 9,677.1 Costs deferred 1,077.4 1,168.9 2,111.8 2,159.2 Amortization (1,015.3) (1,033.4) (2,038.0) (2,017.8) Ending balance $ 10,041.0 $ 9,818.5 $ 10,041.0 $ 9,818.5

Reserves (Tables)

Reserves (Tables)	6 Months Ended
	Jun. 30, 2024
Insurance [Abstract]
Schedule of 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, 2024 2023 Claims and benefits payable, at beginning of period $ 1,989.2 $ 2,210.0 Less: Reinsurance ceded and other (886.6) (1,228.8) Net claims and benefits payable, at beginning of period 1,102.6 981.2 Incurred losses and loss adjustment expenses related to: Current year 1,384.2 1,293.1 Prior years (65.0) (15.0) Total incurred losses and loss adjustment expenses 1,319.2 1,278.1 Paid losses and loss adjustment expenses related to: Current year 731.5 708.4 Prior years 480.8 438.6 Total paid losses and loss adjustment expenses 1,212.3 1,147.0 Net claims and benefits payable, at end of period 1,209.5 1,112.3 Plus: Reinsurance ceded and other (1) 905.7 908.0 Claims and benefits payable, at end of period (1) $ 2,115.2 $ 2,020.3 (1)
Schedule of Balances and Changes in Long-Term Care Future Policy Benefits and Expenses Reserve	The following table presents the balances and changes in the long-term care future policy benefits and expenses reserve: June 30, 2024 December 31, 2023 Present value of expected net premiums Balance, beginning of period $ 36.4 $ 34.2 Beginning balance at original discount rate 36.5 33.4 Effect of changes in cash flow assumptions (1) — 1.5 Effect of actual variances from expected experience — 3.5 Adjusted beginning of period balance 36.5 38.4 Experience variance (2) (0.1) — Interest accrual 1.7 2.8 Net premiums collected (3.0) (4.7) Ending balance at original discount rate 35.1 36.5 Effect of changes in discount rate assumptions 1.3 (0.1) Balance, end of period $ 36.4 $ 36.4 Present value of expected future policy benefits Balance, beginning of period $ 450.6 $ 462.4 Beginning balance at original discount rate 453.0 444.4 Effect of actual variances from expected experience — 4.4 Adjusted beginning of period balance 453.0 448.8 Experience variance (2) (2.0) 1.0 Interest accrual 13.0 19.5 Benefit payments (12.6) (16.3) Ending balance at original discount rate 451.4 453.0 Effect of changes in discount rate assumptions 26.6 (2.4) Balance, end of period $ 478.0 $ 450.6 Net future policy benefits and expenses $ 441.6 $ 414.2 Related reinsurance recoverable 441.6 414.2 Net future policy benefits and expenses, after reinsurance recoverable $ — $ — Weighted-average liability duration of the future policy benefits and expenses (in years) 11.7 12.0 (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, 2023. (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, 2024 December 31, 2023 Long-term care $ 441.6 $ 414.2 Other 69.9 73.0 Total $ 511.5 $ 487.2 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, 2024 December 31, 2023 Expected future benefits payments $ 814.2 $ 829.3 Expected future gross premiums $ 64.7 $ 69.4 The following table presents the amount of long-term care revenue and interest recognized in the consolidated statements of operations: June 30, 2024 June 30, 2023 Gross premiums $ 1.5 $ 1.6 Interest expense (original discount rate) $ 5.7 $ 5.6 The following table presents the weighted-average interest rate for long-term care insurance contracts: June 30, 2024 June 30, 2023 Interest expense (original discount rate) 5.95 % 5.95 % Current discount rate 5.28 % 5.10 %

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of 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, 2024 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at March 31, 2024 $ (360.4) $ (337.7) $ 5.3 $ (118.4) $ (811.2) Change in accumulated other comprehensive loss before reclassifications (15.1) (34.0) 1.6 — (47.5) Amounts reclassified from accumulated other comprehensive loss — 11.0 (2.5) (2.5) 6.0 Net current-period other comprehensive loss (15.1) (23.0) (0.9) (2.5) (41.5) Balance at June 30, 2024 $ (375.5) $ (360.7) $ 4.4 $ (120.9) $ (852.7) 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 loss before reclassifications 23.7 (54.8) 2.3 0.4 (28.4) Amounts reclassified from accumulated other comprehensive loss — 7.9 (0.2) (2.5) 5.2 Net current-period other comprehensive 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) Six Months Ended June 30, 2024 Foreign Net unrealized Net unrealized gains on derivative transactions Unamortized net losses on Pension Plans Accumulated Balance at December 31, 2023 $ (351.9) $ (305.5) $ 8.5 $ (116.1) $ (765.0) Change in accumulated other comprehensive loss before reclassifications (23.6) (77.8) 1.5 — (99.9) Amounts reclassified from accumulated other comprehensive loss — 22.6 (5.6) (4.8) 12.2 Net current-period other comprehensive loss (23.6) (55.2) (4.1) (4.8) (87.7) Balance at June 30, 2024 $ (375.5) $ (360.7) $ 4.4 $ (120.9) $ (852.7) 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 loss before reclassifications 33.7 21.2 3.4 0.3 58.6 Amounts reclassified from accumulated other comprehensive loss — 11.1 (1.2) (5.0) 4.9 Net current-period other 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)
Schedule of 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 accumulated other comprehensive income Affected line item in the statement where net income is presented Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Net unrealized losses on investments $ 13.9 $ 10.0 $ 28.6 $ 14.0 Net realized losses on investments and fair value changes to equity securities (2.9) (2.1) (6.0) (2.9) Provision for income taxes $ 11.0 $ 7.9 $ 22.6 $ 11.1 Net of tax Net unrealized (gains) losses on derivative transactions related to: Interest rate derivatives $ (0.7) $ (0.7) $ (1.4) $ (2.0) Interest expense Foreign exchange derivatives (2.5) 0.4 (5.7) 0.4 Underwriting, selling, general and administrative expenses (3.2) (0.3) (7.1) (1.6) 0.7 0.1 1.5 0.4 Provision for income taxes $ (2.5) $ (0.2) $ (5.6) $ (1.2) Net of tax Amortization of pension and postretirement unrecognized net periodic benefit cost: Amortization of net loss $ 0.3 $ 0.3 $ 0.6 $ 0.6 (1) Amortization of prior service credit (3.5) (3.4) (6.8) (6.8) (1) (3.2) (3.1) (6.2) (6.2) 0.7 0.6 1.4 1.2 Provision for income taxes $ (2.5) $ (2.5) $ (4.8) $ (5.0) Net of tax Total reclassifications for the period $ 6.0 $ 5.2 $ 12.2 $ 4.9 Net of tax (1)

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2024
Earnings Per Share [Abstract]
Schedule of 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, 2024 2023 2024 2023 Numerator Net income $ 188.7 $ 156.3 $ 425.1 $ 269.9 Less: Common stock dividends paid (39.9) (39.7) (77.3) (76.7) Undistributed earnings $ 148.8 $ 116.6 $ 347.8 $ 193.2 Denominator Weighted average common shares outstanding used in basic per common share calculations 52,500,727 53,745,611 52,516,296 53,619,711 Incremental common shares from: PSUs 167,770 78,906 249,421 158,159 ESPP 49,239 65,165 49,239 65,165 Weighted average common shares outstanding used in diluted per common share calculations 52,717,736 53,889,682 52,814,956 53,843,035 Earnings per common share – Basic Distributed earnings $ 0.76 $ 0.74 $ 1.47 $ 1.43 Undistributed earnings 2.83 2.17 6.62 3.60 Net income $ 3.59 $ 2.91 $ 8.09 $ 5.03 Earnings per common share – Diluted Distributed earnings $ 0.76 $ 0.74 $ 1.46 $ 1.42 Undistributed earnings 2.82 2.16 6.59 3.59 Net income $ 3.58 $ 2.90 $ 8.05 $ 5.01

Retirement and Other Employee_2

Retirement and Other Employee Benefits (Tables)	6 Months Ended
	Jun. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Schedule 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, 2024 and 2023: 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, 2024 2023 2024 2023 2024 2023 Interest cost $ 6.6 $ 7.0 $ 0.5 $ 0.6 $ 0.1 $ 0.1 Expected return on plan assets (10.2) (10.3) — — (0.4) (0.4) Amortization of prior service credit — — — — (3.5) (3.4) Amortization of net loss — — 0.3 0.3 — — Net periodic benefit cost $ (3.6) $ (3.3) $ 0.8 $ 0.9 $ (3.8) $ (3.7) 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, 2024 2023 2024 2023 2024 2023 Interest cost $ 13.3 $ 14.0 $ 1.1 $ 1.2 $ 0.1 $ 0.2 Expected return on plan assets (20.2) (20.6) — — (0.7) (0.8) Amortization of prior service credit — — — — (6.8) (6.8) Amortization of net loss (gain) — — 0.6 0.6 — — Settlement loss — — — — — — Net periodic benefit cost $ (6.9) $ (6.6) $ 1.7 $ 1.8 $ (7.4) $ (7.4)

Restructuring and Related Imp_2

Restructuring and Related Impairment Charges (Tables)	6 Months Ended
	Jun. 30, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Costs Related to Strategic Exit Activities	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, Costs Incurred for Six Months Ended June 30, Estimated Remaining Costs Estimated Total Costs 2024 2023 2024 2023 Transformational plan: Severance and other employee benefits $ 0.3 $ (1.3) $ 0.3 $ (2.9) $ 3.2 $ 56.2 Total transformational plan 0.3 (1.3) 0.3 (2.9) 3.2 56.2 Return to work strategy: Contract exit costs 0.9 — 0.9 4.9 — 22.9 Fixed asset impairment — — — — — 2.3 Right-of-use asset impairment — — — 3.1 — 10.2 Total return to work strategy 0.9 — 0.9 8.0 — 35.4 Total restructuring and impairment charges $ 1.2 $ (1.3) $ 1.2 $ 5.1 $ 3.2 $ 91.6
Schedule of Rollforward of Accrued Liability	The following table shows the rollforward of the accrued liability by major type. Transformational Plan Return to Work Strategy (contract exit costs) Balance at January 1, 2024 $ 27.8 $ 17.1 Charges incurred 0.3 1.1 Non-cash adjustment — (0.2) Cash payments (13.9) (4.7) Balance at June 30, 2024 $ 14.2 $ 13.3

Nature of Operations (Details)

Nature of Operations (Details)	6 Months Ended
	Jun. 30, 2024 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	2

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted cash and cash equivalents	$ 55.7	$ 43.6

Segment Information - Narrative

Segment Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2024 segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information - Schedule

Segment Information - Schedule of Segment Adjusted EBITDA Disclosure (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Reconciling items to consolidated net income:
Net realized losses on investments and fair value changes to equity securities	$ (19.6)	$ (20)		$ (28.4)	$ (30.6)
Income before income tax expense	232.9	204.3		525.8	351.4
Income tax expense	44.2	48		100.7	81.5
Net income	188.7	156.3		425.1	269.9
Disposal group, disposed of by sale, 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	(27.2)	(28.5)		(56.7)	(52.9)
Segment Reconciling Items
Reconciling items to consolidated net income:
Interest expense	(26.7)	(27.2)		(53.5)	(54.2)
Depreciation expense	(30)	(25.4)		(60.6)	(51.8)
Amortization of purchased intangible assets	(17.3)	(18.7)		(34.9)	(37.4)
Net realized losses on investments and fair value changes to equity securities	(19.6)	(20)		(28.4)	(30.6)
Non-core operations	(3.7)	(30.2)		(6.3)	(42.4)
Restructuring costs	(1.2)	1.3		(1.2)	(5.1)
Assurant Health runoff operations	0	0		0.4	7.5
Other adjustments	8	1.4		16.2	(0.6)
Total reconciling items	(90.5)	(118.8)		(168.3)	(214.6)
Global Lifestyle | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	189.7	197		397.4	395.9
Global Housing | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 160.9	$ 154.6		$ 353.4	$ 223

Segment Information - Schedul_2

Segment Information - Schedule of Net Earned Premiums by Segment and Product (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Global Lifestyle
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	$ 2,183.5	$ 2,108.9	$ 4,371.3	$ 4,149.2
Global Lifestyle | Connected Living
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	1,148.5	1,079.2	2,288.8	2,105.8
Global Lifestyle | Global Automotive
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	1,035	1,029.7	2,082.5	2,043.4
Global Housing
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	633.6	536.6	1,205.8	1,041.9
Global Housing | Homeowners
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	512.7	412.3	960.1	803.7
Global Housing | Renters and Other
Segment Reporting Information [Line Items]
Net earned premiums, fees and other income	$ 120.9	$ 124.3	$ 245.7	$ 238.2

Segment Information - Schedul_3

Segment Information - Schedule of Assets by Segment (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Assets	$ 33,773	$ 33,635.2
Disposal Group, Held-for-sale, Not Discontinued Operations | Property In Miami, Florida
Segment Reporting Information [Line Items]
Held-for-sale property	46	46
Corporate and Other
Segment Reporting Information [Line Items]
Assets	2,099.6	1,717.8
Global Lifestyle | Operating Segments
Segment Reporting Information [Line Items]
Assets	27,233	27,642.9
Global Housing | Operating Segments
Segment Reporting Information [Line Items]
Assets	$ 4,440.4	$ 4,274.5

Contract Revenues (Details)

Contract Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Global Lifestyle
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	$ 314.3	$ 254.7	$ 659.5	$ 501.9
Global Housing
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	40.8	20.9	61.4	40.8
Service contracts and sales
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	205.6		205.6		$ 218.9
Unearned revenue from contracts with customers	150.7		150.7		155.4
Contract with customer, liability, unearned revenue	17.4	$ 20.6	34.7	$ 42.5
Deferred upfront commissions and other costs	$ 56.1		$ 56.1		$ 47.2

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, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	$ 7,644.1	$ 7,292.4
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	47.4	81.7
Fixed maturity securities, gross unrealized losses	(483)	(462)
Fixed maturity securities, fair value	7,208.5	6,912.1
U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	62.9	68.9
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	0.2	0.7
Fixed maturity securities, gross unrealized losses	(4.9)	(4.4)
Fixed maturity securities, fair value	58.2	65.2
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	145.4	159.2
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	0.7	1.2
Fixed maturity securities, gross unrealized losses	(12.1)	(11.2)
Fixed maturity securities, fair value	134	149.2
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	474.6	483.1
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	1.6	9.4
Fixed maturity securities, gross unrealized losses	(20.5)	(12.7)
Fixed maturity securities, fair value	455.7	479.8
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	961.1	891.4
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	8.6	5.2
Fixed maturity securities, gross unrealized losses	(13.2)	(22.8)
Fixed maturity securities, fair value	956.5	873.8
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	343.7	383.1
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	0.6	0.4
Fixed maturity securities, gross unrealized losses	(40.3)	(53.3)
Fixed maturity securities, fair value	304	330.2
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	632.5	534.7
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	1.1	1.9
Fixed maturity securities, gross unrealized losses	(56.4)	(50.6)
Fixed maturity securities, fair value	577.2	486
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	3,478.8	3,300.5
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	23.2	45.3
Fixed maturity securities, gross unrealized losses	(241.5)	(215.4)
Fixed maturity securities, fair value	3,260.5	3,130.4
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	1,545.1	1,471.5
Fixed maturity securities available for sale, allowances for credit losses	0	0
Fixed maturity securities, gross unrealized gains	11.4	17.6
Fixed maturity securities, gross unrealized losses	(94.1)	(91.6)
Fixed maturity securities, fair value	$ 1,462.4	$ 1,397.5

Investments - Amortized Cost an

Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, cost or amortized cost	$ 186
Due after one year through five years, cost or amortized cost	1,516.7
Due after five years through ten years, cost or amortized cost	2,952
Due after ten years, cost or amortized cost	1,052.1
Total, cost or amortized cost	5,706.8
Fixed maturity securities available for sale, amortized cost	7,644.1	$ 7,292.4
Due in one year or less, fair value	185.4
Due after one year through five years, fair value	1,479.1
Due after five years through ten years, fair value	2,805.4
Due after ten years, fair value	900.9
Total, fair value	5,370.8
Fixed maturity securities, fair value	7,208.5	6,912.1
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	343.7
Fair value	304
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	632.5
Fair value	577.2
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Cost or amortized cost	961.1
Fixed maturity securities available for sale, amortized cost	961.1	891.4
Fair value	956.5
Fixed maturity securities, fair value	$ 956.5	$ 873.8

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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Net realized gains (losses) on investments and fair value changes to equity securities related to sales and other	$ (15.8)	$ (16.9)	$ (16.6)	$ (25)
Net realized losses related to impairments:
Investment impairment losses included in net realized losses	(3.8)	(3.1)	(11.8)	(5.6)
Net realized losses related to impairment, other investments	(3.1)	(1)	(10.8)	(3.5)
Total net realized losses on investments and fair value changes to equity securities	(19.6)	(20)	(28.4)	(30.6)
Equity securities, realized gain	0.3	0.4	4.1	0.4
Equity investment, impairment loss	3.1	1	10.8	3.5
Fixed maturity securities
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Net realized gains (losses) on investments and fair value changes to equity securities related to sales and other	(14.8)	(7.8)	(29.2)	(11.8)
Net realized losses related to impairments:
Investment impairment losses included in net realized losses	(0.7)	(2.1)	(1)	(2.1)
Equity securities
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Net realized gains (losses) on investments and fair value changes to equity securities related to sales and other	0	(9.8)	10.1	(12.9)
Commercial mortgage loans on real estate
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Net realized gains (losses) on investments and fair value changes to equity securities related to sales and other	(1.3)	0.2	(2.3)	(1.3)
Other investments
Net realized (losses) gains on investments related to sales and other and fair value changes to equity securities:
Net realized gains (losses) on investments and fair value changes to equity securities related to sales and other	0.3	0.5	4.8	1
Net realized losses related to impairments:
Net realized losses related to impairment, other investments	(3.1)	(1)	(10.8)	(3.5)
Equity investment, impairment loss	$ 3.1	$ 1	$ 10.8	$ 3.5

Investments - Fair Value Change

Investments - Fair Value Changes to Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Net gains (losses) recognized on equity securities	$ 0	$ (9.8)	$ 10.1	$ (12.9)
Less: Net realized gains (losses) related to sales of equity securities	5.2	(1.5)	5.1	(2.3)
Total fair value changes to equity securities held	$ (5.2)	$ (8.3)	$ 5	$ (10.6)

Investments - Equity Securities

Investments - Equity Securities without Readily Determinable Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Initial cost	$ 79.5	$ 86.8
Cumulative upward adjustments	55.1	51.1
Cumulative downward adjustments (including impairments)	(18.4)	(17.9)
Carrying value	$ 116.2	$ 120

Investments - Category and Dura

Investments - Category and Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	$ 1,945.9	$ 766.5
Fixed maturity securities, less than 12 months, unrealized losses	(52.4)	(35.9)
Fixed maturity securities, 12 months or more, fair value	3,027.4	3,618.9
Fixed maturity securities, 12 months or more, unrealized losses	(430.6)	(426.1)
Fixed maturity securities, total, fair value	4,973.3	4,385.4
Fixed maturity securities, unrealized losses	(483)	(462)
U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	9.6	5.2
Fixed maturity securities, less than 12 months, unrealized losses	(0.1)	(0.1)
Fixed maturity securities, 12 months or more, fair value	40.7	43.7
Fixed maturity securities, 12 months or more, unrealized losses	(4.8)	(4.3)
Fixed maturity securities, total, fair value	50.3	48.9
Fixed maturity securities, unrealized losses	(4.9)	(4.4)
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	17	3.9
Fixed maturity securities, less than 12 months, unrealized losses	(0.4)	(0.1)
Fixed maturity securities, 12 months or more, fair value	82.6	96.5
Fixed maturity securities, 12 months or more, unrealized losses	(11.7)	(11.1)
Fixed maturity securities, total, fair value	99.6	100.4
Fixed maturity securities, unrealized losses	(12.1)	(11.2)
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	185.3	42.5
Fixed maturity securities, less than 12 months, unrealized losses	(4)	(0.5)
Fixed maturity securities, 12 months or more, fair value	203.1	203.5
Fixed maturity securities, 12 months or more, unrealized losses	(16.5)	(12.2)
Fixed maturity securities, total, fair value	388.4	246
Fixed maturity securities, unrealized losses	(20.5)	(12.7)
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	112.9	64
Fixed maturity securities, less than 12 months, unrealized losses	(3.7)	(3)
Fixed maturity securities, 12 months or more, fair value	159.4	404.7
Fixed maturity securities, 12 months or more, unrealized losses	(9.5)	(19.8)
Fixed maturity securities, total, fair value	272.3	468.7
Fixed maturity securities, unrealized losses	(13.2)	(22.8)
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	40.8	66.3
Fixed maturity securities, less than 12 months, unrealized losses	(2)	(8.4)
Fixed maturity securities, 12 months or more, fair value	215.9	244.2
Fixed maturity securities, 12 months or more, unrealized losses	(38.3)	(44.9)
Fixed maturity securities, total, fair value	256.7	310.5
Fixed maturity securities, unrealized losses	(40.3)	(53.3)
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	178.6	98.8
Fixed maturity securities, less than 12 months, unrealized losses	(3.9)	(3.5)
Fixed maturity securities, 12 months or more, fair value	281.3	285.1
Fixed maturity securities, 12 months or more, unrealized losses	(52.5)	(47.1)
Fixed maturity securities, total, fair value	459.9	383.9
Fixed maturity securities, unrealized losses	(56.4)	(50.6)
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	1,012.9	331.9
Fixed maturity securities, less than 12 months, unrealized losses	(29.2)	(14.7)
Fixed maturity securities, 12 months or more, fair value	1,386	1,596.4
Fixed maturity securities, 12 months or more, unrealized losses	(212.3)	(200.7)
Fixed maturity securities, total, fair value	2,398.9	1,928.3
Fixed maturity securities, unrealized losses	(241.5)	(215.4)
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, less than 12 months, fair value	388.8	153.9
Fixed maturity securities, less than 12 months, unrealized losses	(9.1)	(5.6)
Fixed maturity securities, 12 months or more, fair value	658.4	744.8
Fixed maturity securities, 12 months or more, unrealized losses	(85)	(86)
Fixed maturity securities, total, fair value	1,047.2	898.7
Fixed maturity securities, unrealized losses	$ (94.1)	$ (91.6)

Investments - Narrative (Detail

Investments - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) investment	Dec. 31, 2023 USD ($) investment
Investment [Line Items]
Percentage of securities representing gross unrealized losses	10%	11%
Percentage of gross unrealized losses in a continuous loss position less than twelve months	11%	8%
Individual securities comprising total gross unrealized losses (in shares) | investment	3,317	3,096
Approximate percentage, outstanding principal balance of commercial mortgage loans	34%
Minimum
Investment [Line Items]
Outstanding balance of commercial mortgage loans (less than)	$ 0.1	$ 0.1
Maximum
Investment [Line Items]
Outstanding balance of commercial mortgage loans (less than)	$ 5	$ 10

Investments - Credit Quality In

Investments - Credit Quality Indicators (Details) - Commercial Portfolio Segment $ in Millions	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Greater than 2.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 1.9	$ 0
Financing receivable, originated year one	0	11.8
Financing receivable, originated year two	11.7	9.3
Financing receivable, originated year three	9.2	0
Financing receivable, originated year four	0	0
Prior	43.7	44.9
Total	$ 66.5	$ 66
% of Total	0.197	0.198
1.5 to 2.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 10.5	$ 18.9
Financing receivable, originated year one	18.9	23.6
Financing receivable, originated year two	23.5	28.7
Financing receivable, originated year three	25	0
Financing receivable, originated year four	0	0
Prior	11.8	12.2
Total	$ 89.7	$ 83.4
% of Total	0.267	0.251
1.0 to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 16.3	$ 33.2
Financing receivable, originated year one	33.1	18.2
Financing receivable, originated year two	18	40.1
Financing receivable, originated year three	39.8	0
Financing receivable, originated year four	0	0
Prior	6.5	7.1
Total	$ 113.7	$ 98.6
% of Total	0.338	0.297
Less than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	24.1
Financing receivable, originated year two	24.2	47.8
Financing receivable, originated year three	30.1	2.8
Financing receivable, originated year four	2.8	0
Prior	9.4	9.9
Total	$ 66.5	$ 84.6
% of Total	0.198	0.254
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 28.7	$ 52.1
Financing receivable, originated year one	52	77.7
Financing receivable, originated year two	77.4	125.9
Financing receivable, originated year three	104.1	2.8
Financing receivable, originated year four	2.8	0
Prior	71.4	74.1
Total	$ 336.4	$ 332.6
% of Total	1	1
70% and less
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 28.7	$ 49.6
Financing receivable, originated year one	49.6	42.3
Financing receivable, originated year two	41.8	29.5
Financing receivable, originated year three	25.8	0
Financing receivable, originated year four	0	0
Prior	61.7	60.1
Total	$ 207.6	$ 181.5
% of Total	0.617	0.546
71% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 2.5
Financing receivable, originated year one	2.4	22.7
Financing receivable, originated year two	22.7	69.6
Financing receivable, originated year three	64.4	2.8
Financing receivable, originated year four	2.8	0
Prior	4.4	4.4
Total	$ 96.7	$ 102
% of Total	0.287	0.307
81% to 95%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	10.7
Financing receivable, originated year two	8.9	25.5
Financing receivable, originated year three	12.6	0
Financing receivable, originated year four	0	0
Prior	5.3	5.5
Total	$ 26.8	$ 41.7
% of Total	0.080	0.125
Greater than 95%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 0	$ 0
Financing receivable, originated year one	0	2
Financing receivable, originated year two	4	1.3
Financing receivable, originated year three	1.3	0
Financing receivable, originated year four	0	0
Prior	0	4.1
Total	$ 5.3	$ 7.4
% of Total	0.016	0.022
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated current year	$ 28.7	$ 52.1
Financing receivable, originated year one	52	77.7
Financing receivable, originated year two	77.4	125.9
Financing receivable, originated year three	104.1	2.8
Financing receivable, originated year four	2.8	0
Prior	71.4	74.1
Total	$ 336.4	$ 332.6
% of Total	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) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financial Assets
Fixed maturity securities, fair value	$ 7,208.5	$ 6,912.1
Equity securities at fair value	226.3	223
Other investments	505.9	499
States, municipalities and political subdivisions
Financial Assets
Fixed maturity securities, fair value	134	149.2
Foreign governments
Financial Assets
Fixed maturity securities, fair value	455.7	479.8
Asset-backed
Financial Assets
Fixed maturity securities, fair value	956.5	873.8
Commercial mortgage-backed
Financial Assets
Fixed maturity securities, fair value	304	330.2
Residential mortgage-backed
Financial Assets
Fixed maturity securities, fair value	577.2	486
U.S. corporate
Financial Assets
Fixed maturity securities, fair value	3,260.5	3,130.4
Foreign corporate
Financial Assets
Fixed maturity securities, fair value	1,462.4	1,397.5
Recurring
Financial Assets
Short-term investments	211.1	210.1
Other investments	71.2	62.5
Cash equivalents	1,319.6	1,051.3
Other assets	9.1	15.8
Assets held in separate accounts	11.3	10.5
Total financial assets	9,057.1	8,485.3
Financial Liabilities
Other liabilities	71.1	64.2
Liabilities related to separate accounts	11.3	10.5
Total financial liabilities	82.4	74.7
Recurring | Level 1
Financial Assets
Short-term investments	190.4	121.6
Other investments	71.1	62.4
Cash equivalents	1,308.4	1,040.4
Other assets	0	0
Assets held in separate accounts	8.1	6.7
Total financial assets	1,595	1,264.9
Financial Liabilities
Other liabilities	71.1	62.4
Liabilities related to separate accounts	8.1	6.7
Total financial liabilities	79.2	69.1
Recurring | Level 2
Financial Assets
Short-term investments	20.7	88.5
Other investments	0	0
Cash equivalents	11.2	10.9
Other assets	0	0
Assets held in separate accounts	3.2	3.8
Total financial assets	7,302	7,079
Financial Liabilities
Other liabilities	0	1.8
Liabilities related to separate accounts	3.2	3.8
Total financial liabilities	3.2	5.6
Recurring | Level 3
Financial Assets
Short-term investments	0	0
Other investments	0.1	0.1
Cash equivalents	0	0
Other assets	9.1	15.8
Assets held in separate accounts	0	0
Total financial assets	160.1	141.4
Financial Liabilities
Other liabilities	0	0
Liabilities related to separate accounts	0	0
Total financial liabilities	0	0
Recurring | U.S. government and government agencies and authorities
Financial Assets
Fixed maturity securities, fair value	58.2	65.2
Recurring | U.S. government and government agencies and authorities | Level 1
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | U.S. government and government agencies and authorities | Level 2
Financial Assets
Fixed maturity securities, fair value	58.2	65.2
Recurring | U.S. government and government agencies and authorities | Level 3
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | States, municipalities and political subdivisions
Financial Assets
Fixed maturity securities, fair value	134	149.2
Recurring | States, municipalities and political subdivisions | Level 1
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | States, municipalities and political subdivisions | Level 2
Financial Assets
Fixed maturity securities, fair value	134	149.2
Recurring | States, municipalities and political subdivisions | Level 3
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | Foreign governments
Financial Assets
Fixed maturity securities, fair value	455.7	479.8
Recurring | Foreign governments | Level 1
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | Foreign governments | Level 2
Financial Assets
Fixed maturity securities, fair value	455.7	479.8
Recurring | Foreign governments | Level 3
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | Asset-backed
Financial Assets
Fixed maturity securities, fair value	956.5	873.8
Recurring | Asset-backed | Level 1
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | Asset-backed | Level 2
Financial Assets
Fixed maturity securities, fair value	860.9	791
Recurring | Asset-backed | Level 3
Financial Assets
Fixed maturity securities, fair value	95.6	82.8
Recurring | Commercial mortgage-backed
Financial Assets
Fixed maturity securities, fair value	304	330.2
Recurring | Commercial mortgage-backed | Level 1
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | Commercial mortgage-backed | Level 2
Financial Assets
Fixed maturity securities, fair value	304	330.2
Recurring | Commercial mortgage-backed | Level 3
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | Residential mortgage-backed
Financial Assets
Fixed maturity securities, fair value	577.2	486
Recurring | Residential mortgage-backed | Level 1
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | Residential mortgage-backed | Level 2
Financial Assets
Fixed maturity securities, fair value	577.2	486
Recurring | Residential mortgage-backed | Level 3
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | U.S. corporate
Financial Assets
Fixed maturity securities, fair value	3,260.5	3,130.4
Recurring | U.S. corporate | Level 1
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | U.S. corporate | Level 2
Financial Assets
Fixed maturity securities, fair value	3,215.2	3,094.8
Recurring | U.S. corporate | Level 3
Financial Assets
Fixed maturity securities, fair value	45.3	35.6
Recurring | Foreign corporate
Financial Assets
Fixed maturity securities, fair value	1,462.4	1,397.5
Recurring | Foreign corporate | Level 1
Financial Assets
Fixed maturity securities, fair value	0	0
Recurring | Foreign corporate | Level 2
Financial Assets
Fixed maturity securities, fair value	1,452.4	1,390.4
Recurring | Foreign corporate | Level 3
Financial Assets
Fixed maturity securities, fair value	10	7.1
Recurring | Mutual funds
Financial Assets
Equity securities at fair value	13.6	16.6
Recurring | Mutual funds | Level 1
Financial Assets
Equity securities at fair value	13.6	16.6
Recurring | Mutual funds | Level 2
Financial Assets
Equity securities at fair value	0	0
Recurring | Mutual funds | Level 3
Financial Assets
Equity securities at fair value	0	0
Recurring | Common stocks
Financial Assets
Equity securities at fair value	4.1	17.9
Recurring | Common stocks | Level 1
Financial Assets
Equity securities at fair value	3.4	17.2
Recurring | Common stocks | Level 2
Financial Assets
Equity securities at fair value	0.7	0.7
Recurring | Common stocks | Level 3
Financial Assets
Equity securities at fair value	0	0
Recurring | Non-redeemable preferred stocks
Financial Assets
Equity securities at fair value	208.6	188.5
Recurring | Non-redeemable preferred stocks | Level 1
Financial Assets
Equity securities at fair value	0	0
Recurring | Non-redeemable preferred stocks | Level 2
Financial Assets
Equity securities at fair value	208.6	188.5
Recurring | Non-redeemable preferred stocks | Level 3
Financial Assets
Equity securities at fair value	$ 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, 2024	Dec. 31, 2023
Financial Assets
Other assets	$ 9.1	$ 15.8
Total financial assets	9,057.1	8,485.3
Level 1
Financial Assets
Other assets	0	0
Total financial assets	1,595	1,264.9
Level 2
Financial Assets
Other assets	0	0
Total financial assets	7,302	7,079
Level 3
Financial Assets
Other assets	9.1	15.8
Total financial assets	160.1	141.4
Carrying Value
Financial Assets
Commercial mortgage loans on real estate	330.2	328.7
Other investments	3.9	3.7
Other assets	19.3	26.5
Total financial assets	353.4	358.9
Financial Liabilities
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	6.9	7.3
Funds withheld under reinsurance	322	392.7
Debt	2,081.8	2,080.6
Total financial liabilities	2,410.7	2,480.6
Fair Value
Financial Assets
Commercial mortgage loans on real estate	332.6	313.7
Other investments	3.9	3.7
Other assets	19.3	26.5
Total financial assets	355.8	343.9
Financial Liabilities
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	7.3	7.8
Funds withheld under reinsurance	322	392.7
Debt	1,981.4	1,972.4
Total financial liabilities	2,310.7	2,372.9
Fair Value | Level 1
Financial Assets
Commercial mortgage loans on real estate	0	0
Other investments	1.4	1.4
Other assets	0	0
Total financial assets	1.4	1.4
Financial Liabilities
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	0	0
Funds withheld under reinsurance	322	392.7
Debt	0	0
Total financial liabilities	322	392.7
Fair Value | Level 2
Financial Assets
Commercial mortgage loans on real estate	0	0
Other investments	0	0
Other assets	0	0
Total financial assets	0	0
Financial Liabilities
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	0	0
Funds withheld under reinsurance	0	0
Debt	1,981.4	1,972.4
Total financial liabilities	1,981.4	1,972.4
Fair Value | Level 3
Financial Assets
Commercial mortgage loans on real estate	332.6	313.7
Other investments	2.5	2.3
Other assets	19.3	26.5
Total financial assets	354.4	342.5
Financial Liabilities
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal)	7.3	7.8
Funds withheld under reinsurance	0	0
Debt	0	0
Total financial liabilities	$ 7.3	$ 7.8

Deferred Acquisition Costs - Sc

Deferred Acquisition Costs - Schedule of Deferred Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	$ 9,978.9	$ 9,683	$ 9,967.2	$ 9,677.1
Costs deferred	1,077.4	1,168.9	2,111.8	2,159.2
Amortization	(1,015.3)	(1,033.4)	(2,038)	(2,017.8)
Ending balance	$ 10,041	$ 9,818.5	$ 10,041	$ 9,818.5

Reserves - Roll Forward of Clai

Reserves - Roll Forward of Claims and Benefits Payable (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Claims and benefits payable, at beginning of period	$ 1,989.2	$ 2,210
Less: Reinsurance ceded and other	(886.6)	(1,228.8)
Net claims and benefits payable, at beginning of period	1,102.6	981.2
Incurred losses and loss adjustment expenses related to:
Current year	1,384.2	1,293.1
Prior years	(65)	(15)
Total incurred losses and loss adjustment expenses	1,319.2	1,278.1
Paid losses and loss adjustment expenses related to:
Current year	731.5	708.4
Prior years	480.8	438.6
Total paid losses and loss adjustment expenses	1,212.3	1,147
Net claims and benefits payable, at end of period	1,209.5	1,112.3
Plus: Reinsurance ceded and other	905.7	908
Claims and benefits payable, at end of period	2,115.2	2,020.3
Ceded to U.S. Government | Not Rated
Liability for Claims and Claims Adjustment Expense [Line Items]
Reinsurance recoverables	$ 104	$ 124.1

Reserves - Narrative (Details)

Reserves - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	$ (65)	$ (15)
Sharing Economy and Small Commercial
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	6.9	30
Sharing Economy
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	8.4
Small Commercial
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(1.5)
Global Lifestyle
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(17)	(21.5)
Global Lifestyle | Net Favorable Development
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(20.9)
Global Lifestyle | Extended Service Contracts and Mobile
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(11.7)
Global Lifestyle | Credit and Other Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(9.2)
Global Automotive
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	3.9
Global Housing
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(48.4)	(22.3)
Global Housing | Prior Catastrophe Event
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(1.8)
Global Housing | Non-catastrophe Losses
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(46.6)
Global Housing | Non-catastrophe Losses | Homeowners
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(35.1)
Other Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	$ (6.5)	$ (1.2)

Reserves - Balances of and Chan

Reserves - Balances of and Changes in Liability for Future Policy Benefits (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2024	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Present value of expected future policy benefits
Net future policy benefits and expenses		$ 511.5	$ 487.2
Long-term Care Insurance Contracts
Present value of expected net premiums
Balance, beginning of period	$ 36.4	36.4	34.2
Beginning balance at original discount rate	36.5	36.5	33.4
Effect of changes in cash flow assumptions			0	$ 1.5
Effect of actual variances from expected experience			0	3.5
Adjusted beginning of period balance			36.5	38.4
Experience variance	0	(0.1)
Interest accrual		1.7	2.8
Net premiums collected		(3)	(4.7)
Ending balance at original discount rate		35.1	36.5
Effect of changes in discount rate assumptions		1.3	(0.1)
Balance, end of period		36.4	36.4
Present value of expected future policy benefits
Balance, beginning of period	450.6	450.6	462.4
Beginning balance at original discount rate	$ 453	453	444.4
Effect of actual variances from expected experience			0	4.4
Adjusted beginning of period balance			453	$ 448.8
Experience variance		(2)	1
Interest accrual		13	19.5
Benefit payments		(12.6)	(16.3)
Ending balance at original discount rate		451.4	453
Effect of changes in discount rate assumptions		26.6	(2.4)
Balance, end of period		478	450.6
Net future policy benefits and expenses		441.6	414.2
Related reinsurance recoverable		441.6	414.2
Net future policy benefits and expenses, after reinsurance recoverable		$ 0	$ 0
Weighted-average liability duration of the future policy benefits and expenses (in years)		11 years 8 months 12 days	12 years

Reserves - Policyholder Account

Reserves - Policyholder Account Balances, Future Policy Benefits and Claims (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Future policy benefits and expenses	$ 511.5	$ 487.2
Long-term care
Liability for Claims and Claims Adjustment Expense [Line Items]
Future policy benefits and expenses	441.6	414.2
Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Future policy benefits and expenses	$ 69.9	$ 73

Reserves - Schedule of Undiscou

Reserves - Schedule of Undiscounted Expected Future Benefit Payments and Expected Gross Premiums (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Insurance [Abstract]
Expected future benefits payments	$ 814.2	$ 829.3
Expected future gross premiums	$ 64.7	$ 69.4

Reserves - Schedule of Gross Pr

Reserves - Schedule of Gross Premium and Interest Expense (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Insurance [Abstract]
Gross premiums	$ 1.5	$ 1.6
Interest expense (original discount rate)	$ 5.7	$ 5.6

Reserves - Schedule of Discount

Reserves - Schedule of Discount Rate (Details)	Jun. 30, 2024	Jun. 30, 2023
Insurance [Abstract]
Interest expense (original discount rate)	5.95%	5.95%
Current discount rate	5.28%	5.10%

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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI:
Beginning balance	$ 4,920	$ 4,396.4	$ 4,809.5	$ 4,228.7
Change in accumulated other comprehensive loss before reclassifications	(47.5)	(28.4)	(99.9)	58.6
Amounts reclassified from accumulated other comprehensive loss	6	5.2	12.2	4.9
Total other comprehensive income (loss)	(41.5)	(23.2)	(87.7)	63.5
Ending balance	5,004.3	4,486	5,004.3	4,486
Accumulated Other Comprehensive Loss
AOCI:
Beginning balance	(811.2)	(899.5)	(765)	(986.2)
Ending balance	(852.7)	(922.7)	(852.7)	(922.7)
Foreign currency translation adjustment
AOCI:
Beginning balance	(360.4)	(384)	(351.9)	(394)
Change in accumulated other comprehensive loss before reclassifications	(15.1)	23.7	(23.6)	33.7
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Total other comprehensive income (loss)	(15.1)	23.7	(23.6)	33.7
Ending balance	(375.5)	(360.3)	(375.5)	(360.3)
Net unrealized gains (losses) on investments
AOCI:
Beginning balance	(337.7)	(434)	(305.5)	(513.2)
Change in accumulated other comprehensive loss before reclassifications	(34)	(54.8)	(77.8)	21.2
Amounts reclassified from accumulated other comprehensive loss	11	7.9	22.6	11.1
Total other comprehensive income (loss)	(23)	(46.9)	(55.2)	32.3
Ending balance	(360.7)	(480.9)	(360.7)	(480.9)
Net unrealized gains on derivative transactions
AOCI:
Beginning balance	5.3	9.9	8.5	9.8
Change in accumulated other comprehensive loss before reclassifications	1.6	2.3	1.5	3.4
Amounts reclassified from accumulated other comprehensive loss	(2.5)	(0.2)	(5.6)	(1.2)
Total other comprehensive income (loss)	(0.9)	2.1	(4.1)	2.2
Ending balance	4.4	12	4.4	12
Unamortized net losses on Pension Plans
AOCI:
Beginning balance	(118.4)	(91.4)	(116.1)	(88.8)
Change in accumulated other comprehensive loss before reclassifications	0	0.4	0	0.3
Amounts reclassified from accumulated other comprehensive loss	(2.5)	(2.5)	(4.8)	(5)
Total other comprehensive income (loss)	(2.5)	(2.1)	(4.8)	(4.7)
Ending balance	$ (120.9)	$ (93.5)	$ (120.9)	$ (93.5)

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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	$ 44.2	$ 48	$ 100.7	$ 81.5
Net of tax	(188.7)	(156.3)	(425.1)	(269.9)
Underwriting, selling, general and administrative expenses	1,969.2	1,867.6	3,906.5	3,690.8
Income before income tax expense	(232.9)	(204.3)	(525.8)	(351.4)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	6	5.2	12.2	4.9
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized losses on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized losses on investments and fair value changes to equity securities	13.9	10	28.6	14
Provision for income taxes	(2.9)	(2.1)	(6)	(2.9)
Net of tax	11	7.9	22.6	11.1
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized (gains) losses on derivative transactions
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	0.7	0.1	1.5	0.4
Net of tax	(2.5)	(0.2)	(5.6)	(1.2)
Interest expense	(0.7)	(0.7)	(1.4)	(2)
Underwriting, selling, general and administrative expenses	(2.5)	0.4	(5.7)	0.4
Income before income tax expense	(3.2)	(0.3)	(7.1)	(1.6)
Reclassification out of Accumulated Other Comprehensive Income | Unamortized net losses on Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	0.7	0.6	1.4	1.2
Net of tax	(2.5)	(2.5)	(4.8)	(5)
Income before income tax expense	(3.2)	(3.1)	(6.2)	(6.2)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Underwriting, selling, general and administrative expenses	0.3	0.3	0.6	0.6
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Underwriting, selling, general and administrative expenses	$ (3.5)	$ (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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator
Net income	$ 188.7	$ 156.3	$ 425.1	$ 269.9
Less: Common stock dividends paid	(39.9)	(39.7)	(77.3)	(76.7)
Undistributed earnings	148.8	116.6	347.8	193.2
Undistributed earnings	$ 148.8	$ 116.6	$ 347.8	$ 193.2
Denominator
Weighted average common shares outstanding used in basic per common share calculations (in shares)	52,500,727	53,745,611	52,516,296	53,619,711
Incremental common shares from:
Weighted average common shares outstanding used in diluted per common share calculations (in shares)	52,717,736	53,889,682	52,814,956	53,843,035
Earnings per common share – Basic
Distributed earnings (in dollars per share)	$ 0.76	$ 0.74	$ 1.47	$ 1.43
Undistributed earnings (in dollars per share)	2.83	2.17	6.62	3.60
Net income (in dollars per share)	3.59	2.91	8.09	5.03
Earnings per common share – Diluted
Distributed earnings (in dollars per share)	0.76	0.74	1.46	1.42
Undistributed earning (in dollars per share)	2.82	2.16	6.59	3.59
Net income (in dollars per share)	$ 3.58	$ 2.90	$ 8.05	$ 5.01
PSUs
Incremental common shares from:
Incremental common shares (in shares)	167,770	78,906	249,421	158,159
ESPP
Incremental common shares from:
Incremental common shares (in shares)	49,239	65,165	49,239	65,165

Earnings Per Common Share - Nar

Earnings Per Common Share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Performance Share Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding anti-dilutive shares excluded from diluted EPS (in shares)	93,963	58,380	55,263	60,766

Retirement and Other Employee_3

Retirement and Other Employee Benefits - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2020	Dec. 31, 2023	Feb. 29, 2020
Defined Benefit Plan Disclosure [Line Items]
Qualified pension benefits plan funded status	$ 87,400,000		$ 86,600,000
Funded status percentage	117%		116%
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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Plan | Qualified Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 6.6	$ 7	$ 13.3	$ 14
Expected return on plan assets	(10.2)	(10.3)	(20.2)	(20.6)
Amortization of prior service credit	0	0	0	0
Amortization of net loss (gain)	0	0	0	0
Settlement loss			0	0
Net periodic benefit cost	(3.6)	(3.3)	(6.9)	(6.6)
Pension Plan | Unfunded Nonqualified  Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.5	0.6	1.1	1.2
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	0.3	0.6	0.6
Settlement loss			0	0
Net periodic benefit cost	0.8	0.9	1.7	1.8
Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.1	0.1	0.2
Expected return on plan assets	(0.4)	(0.4)	(0.7)	(0.8)
Amortization of prior service credit	(3.5)	(3.4)	(6.8)	(6.8)
Amortization of net loss (gain)	0	0	0	0
Settlement loss			0	0
Net periodic benefit cost	$ (3.8)	$ (3.7)	$ (7.4)	$ (7.4)

Restructuring and Related Imp_3

Restructuring and Related Impairment Charges - Schedule of Restructuring Costs Related to Strategic Exit Activities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Costs Incurred	$ 1.2	$ (1.3)	$ 1.2	$ 5.1
Estimated Remaining Costs	3.2		3.2
Estimated Total Costs	91.6		91.6
Transformational Plan
Restructuring Cost and Reserve [Line Items]
Costs Incurred	0.3	(1.3)	0.3	(2.9)
Estimated Remaining Costs	3.2		3.2
Estimated Total Costs	56.2		56.2
Return to Work Strategy
Restructuring Cost and Reserve [Line Items]
Costs Incurred	0.9	0	0.9	8
Estimated Remaining Costs	0		0
Estimated Total Costs	35.4		35.4
Severance and other employee benefits | Transformational Plan
Restructuring Cost and Reserve [Line Items]
Costs Incurred	0.3	(1.3)	0.3	(2.9)
Estimated Remaining Costs	3.2		3.2
Estimated Total Costs	56.2		56.2
Contract exit costs | Return to Work Strategy
Restructuring Cost and Reserve [Line Items]
Costs Incurred	0.9	0	0.9	4.9
Estimated Remaining Costs	0		0
Estimated Total Costs	22.9		22.9
Fixed asset impairment | Return to Work Strategy
Restructuring Cost and Reserve [Line Items]
Costs Incurred	0	0	0	0
Estimated Remaining Costs	0		0
Estimated Total Costs	2.3		2.3
Right-of-use asset impairment | Return to Work Strategy
Restructuring Cost and Reserve [Line Items]
Costs Incurred	0	$ 0	0	$ 3.1
Estimated Remaining Costs	0		0
Estimated Total Costs	$ 10.2		$ 10.2

Restructuring and Related Imp_4

Restructuring and Related Impairment Charges - Schedule of Rollforward of Accrued Liability (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Transformational Plan
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 27.8
Charges incurred	0.3
Non-cash adjustment	0
Cash payments	(13.9)
Restructuring reserve, ending balance	14.2
Return to Work Strategy (contract exit costs)
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	17.1
Charges incurred	1.1
Non-cash adjustment	(0.2)
Cash payments	(4.7)
Restructuring reserve, ending balance	$ 13.3

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 1.8	$ 2.9