Horace Mann Educators (HMN) 10-Q 8 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	Apr. 30, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	1-10890
Entity Registrant Name	HORACE MANN EDUCATORS CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	37-0911756
Entity Address, Address Line One	1 Horace Mann Plaza
Entity Address, City or Town	Springfield
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	62715-0001
City Area Code	217
Local Phone Number	789-2500
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	HMN
Security Exchange Name	NYSE
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		40,963,670
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000850141
Current Fiscal Year End Date	--12-31

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,785.4; 2023, $5,652.9)	$ 5,342.7	$ 5,235.3
Equity securities at fair value, (cost $101700000 and $86200000)	84.7	86.2
Limited partnership interests	1,119.3	1,138.8
Policy loans	140.7	141.4
Short-term and other investments	170.5	228.8
Total investments	6,857.9	6,830.5
Cash	20.4	29.7
Deferred policy acquisition costs	337.3	336.3
Reinsurance balances receivable	449.3	480.5
Deposit asset on reinsurance	2,472.4	2,496.6
Intangible assets	166.7	170.3
Goodwill	54.3	54.3
Other assets	361.1	357.6
Separate Account variable annuity assets	3,516.9	3,294.1
Total assets	14,236.3	14,049.9
Policy liabilities
Future policy benefit reserves	1,702.1	1,761.8
Policyholders' account balances	5,137.6	5,187
Unpaid claims and claim expenses	584.4	581.7
Unearned premiums	299.8	300.9
Total policy liabilities	7,723.9	7,831.4
Other policyholder funds	941.1	916
Other liabilities	296.8	287.1
Long-term debt	546.2	546
Separate Account variable annuity liabilities	3,516.9	3,294.1
Total liabilities	13,024.9	12,874.6
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued	0	0
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2024, 66,876,995; 2023, 66,747,821	0.1	0.1
Additional paid-in capital	513.1	510.9
Retained earnings	1,514.4	1,502.2
Accumulated other comprehensive income (loss), net of tax:
Net unrealized investment losses on fixed maturity securities	(348)	(328.3)
Net reserve remeasurements attributable to discount rates	63.3	21.9
Net funded status of benefit plans	(7.6)	(7.6)
Treasury stock, at cost, 2024, 25,911,087 shares; 2023, 25,911,087 shares	(523.9)	(523.9)
Total shareholders’ equity	1,211.4	1,175.3
Total liabilities and shareholders’ equity	$ 14,236.3	$ 14,049.9

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 5,785.4	$ 5,652.9
Equity Securities, FV-NI, Cost	$ 101.7	$ 86.2
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	66,876,995	66,747,821
Treasury stock (in shares)	25,911,087	25,911,087

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues
Net premiums and contract charges earned	$ 275.2	$ 255.9
Net investment income	105.4	100.4
Net investment gains (losses)	2.2	(3.9)
Other income	3.2	1.5
Total revenues	386	353.9
Benefits, losses and expenses
Benefits, claims and settlement expenses	176.3	183.2
Interest credited	52.9	48.7
Operating expenses	84.5	79.8
DAC amortization expense	27	23.7
Intangible asset amortization expense	3.6	3.7
Interest expense	8.7	6.7
Total benefits, losses and expenses	353	345.8
Income before income taxes	33	8.1
Income tax expense	6.5	1.5
Net income	$ 26.5	$ 6.6
Net income per share
Basic (in usd per share)	$ 0.64	$ 0.16
Diluted (in usd per share)	$ 0.64	$ 0.16
Weighted average number of shares and equivalent shares
Basic (in shares)	41.3	41.3
Diluted (in shares)	41.5	41.4
Statements of Comprehensive Income (Loss)
Net income	$ 26.5	$ 6.6
Other comprehensive income (loss), net of tax:
Change in net unrealized investment losses on fixed maturity securities	(19.7)	93.2
Change in net reserve remeasurements attributable to discount rates	41.4	(41.2)
Change in net funded status of benefit plans	0	0
Other comprehensive income	21.7	52
Comprehensive income (loss)	$ 48.2	$ 58.6

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss), net of tax:	Treasury stock, at cost
Beginning balance at Dec. 31, 2022		$ 0.1	$ 502.6	$ 1,512.4	$ (399.4)	$ (517.4)
Increase (Decrease) in Stockholders' Equity
Options exercised and conversion of common and restricted stock units			(1.4)
Share-based compensation expense			1.9
Net income (loss)	$ 6.6			6.6
Dividends, 2024, $0.34 per share; 2023, $0.33 per share				(13.8)
Change in net unrealized investment losses on fixed maturity securities					93.2
Change in net reserve remeasurements attributable to discount rates	(41.2)				(41.2)
Treasury stock acquired - share repurchase authorization						(4.4)
Ending balance at Mar. 31, 2023	1,139.2	0.1	503.1	1,505.2	(347.4)	(521.8)
Beginning balance at Dec. 31, 2023	1,175.3	0.1	510.9	1,502.2	(314)	(523.9)
Increase (Decrease) in Stockholders' Equity
Options exercised and conversion of common and restricted stock units			(0.1)
Share-based compensation expense			2.3
Net income (loss)	26.5			26.5
Dividends, 2024, $0.34 per share; 2023, $0.33 per share				(14.3)
Change in net unrealized investment losses on fixed maturity securities					(19.7)
Change in net reserve remeasurements attributable to discount rates	41.4				41.4
Ending balance at Mar. 31, 2024	$ 1,211.4	$ 0.1	$ 513.1	$ 1,514.4	$ (292.3)	$ (523.9)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Cash dividends (in usd per share)	$ 0.34	$ 0.33

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows - operating activities
Net income	$ 26.5	$ 6.6
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net investment gains (losses)	(2.2)	3.9
Depreciation and intangible asset amortization	6.6	6.6
Share-based compensation expense	2.5	2
Loss (gain) from equity method investments, net of dividends or distributions	15.6	10
Changes in:
Insurance liabilities	(27.8)	55.8
Amounts due under reinsurance agreements	31.3	0.3
Income tax liabilities	17.6	(9.9)
Other operating assets and liabilities	10.8	5.4
Other, net	(6.4)	5.7
Net cash provided by operating activities	74.5	86.4
Cash flows - investing activities
Fixed maturity securities purchases	(335.6)	(185.5)
Fixed maturity securities sales	88	62.7
Fixed maturity securities maturities, paydowns, calls and redemptions	119.3	73.7
Equity securities purchases	(1.1)	(1.1)
Equity securities sales and repayments	0	0
Limited partnership interests purchases	(19.2)	(75.1)
Limited partnership interests sales	23.1	3.4
Change in short-term and other investments, net	65	26.6
Other-net	1	0
Net cash used in investing activities	(59.5)	(95.3)
Cash flows - financing activities
Dividends paid to shareholders	(13.9)	(13.5)
Treasury stock acquired	0	(4.4)
Proceeds from exercise of stock options	1.1	0
Withholding tax payments on RSUs tendered	(1.6)	(1.7)
Annuity contracts: variable, fixed and FHLB funding agreements:
Deposits	185.9	278.7
Benefits, withdrawals and net transfers to Separate Account variable annuity assets	(149.3)	(152.2)
Repayment of FHLB funding agreements	(50)	(85)
Life policy accounts deposits, withdrawals, and surrenders	2.1	2.3
Change in deposit asset on reinsurance	(49.3)	(24)
Net increase (decrease) in reverse repurchase agreements	50	0
Change in book overdrafts	0.7	(6.7)
Net cash used in financing activities	(24.3)	(6.5)
Net decrease in cash	(9.3)	(15.4)
Cash at beginning of period	29.7	42.8
Cash at end of period	$ 20.4	$ 27.4

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies Business Horace Mann Educators Corporation is a holding company for insurance subsidiaries that market and underwrite personal lines of property and casualty insurance products (primarily personal lines of auto and property insurance), life insurance products, retirement products (primarily tax-qualified fixed and variable annuities), worksite direct insurance products (primarily cancer, heart, hospital, supplemental disability and accident coverages), and employer-sponsored group benefit products (primarily short-term and long-term group disability, and group term life coverages), primarily to K-12 teachers, administrators and other employees of public schools and their families (collectively, HMEC, the Company or Horace Mann). The Company conducts and manages its business in four reporting segments: (1) Property & Casualty, (2) Life & Retirement, (3) Supplemental & Group Benefits and (4) Corporate & Other. Basis of Presentation The accompanying Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP) and with the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and disclosures normally included in annual financial statements prepared in conformity with GAAP, but are not required for interim reporting purposes, have been omitted. These Consolidated Financial Statements and Notes thereto should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in Part II - Item 8 of the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The results of operations for the three months ended March 31, 2024 are not necessarily indicative of the results to be expected for the full year. The accompanying Consolidated Financial Statements and Notes thereto are unaudited and reflect all adjustments (generally consisting only of normal recurring accruals) which are, in the opinion of management, necessary for the fair presentation of the consolidated financial position, results of operations and cash flows for the interim periods. The Company's significant accounting policies are summarized in Part II - Item 8, Note 1 of the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The Company has reclassified the presentation of certain prior period information to conform to the current year's presentation. Consolidation All intercompany transactions and balances between HMEC and its subsidiaries and affiliates have been eliminated. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the reporting date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. The most significant critical accounting estimates include valuation of hard-to-value fixed maturity securities, evaluation of credit loss impairments for fixed maturity securities, valuation of future policy benefit reserves, and valuation of liabilities for property and casualty unpaid claims and claim expense reserves. Future Adoption of New Accounting Standards Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This update will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 includes: 1) a requirement to disclose 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, 2) a requirement to disclose an amount for other segment items by reportable segment and a description of its composition, 3) a requirement to disclose a reportable segments profit or loss and assets currently required by Topic 280 in interim periods, 4) clarifies that in addition to the measure that is most consistent with the measurement principles under generally accepted accounting principles (GAAP), a public entity is not precluded from reporting additional measures of a segment's profit or loss that are used by the CODM in assessing segment performance and deciding how to allocate resources, and 5) a requirement to disclose 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. This guidance will be effective for the Company for annual periods beginning after December 15, 2023 and interim periods beginning after December 15, 2024. Early adoption is permitted. The guidance will have no net impact on the Company's consolidated financial position, results of operations, or cash flows. Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This update will improve 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. This guidance will be effective for the Company for annual periods beginning after December 15, 2024 and interim periods beginning after December 15, 2025. Early adoption is permitted. The guidance will have no net impact on the Company's consolidated financial position, results of operations, or cash flows.

Investments

Investments	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Net Investment Income The components of net investment income for the following periods were as follows: ($ in millions) Three Months Ended 2024 2023 Fixed maturity securities $ 70.4 $ 67.7 Equity securities 1.2 2.7 Limited partnership interests 6.2 4.4 Short-term and other investments 4.7 3.5 Investment expenses (2.6) (3.6) Net investment income - investment portfolio 79.9 74.7 Investment income - deposit asset on reinsurance 25.5 25.7 Total net investment income $ 105.4 $ 100.4 Net Investment Gains (Losses) Net investment gains (losses) for the following periods were as follows: ($ in millions) Three Months Ended 2024 2023 Fixed maturity securities $ (1.0) $ (2.4) Equity securities 2.6 (1.0) Short-term investments and other 0.6 (0.5) Net investment gains (losses) $ 2.2 $ (3.9) The Company, from time to time, sells fixed maturity securities subsequent to the reporting date but prior to the issuance of the financial statements that were in an unrealized loss position but no credit loss was recognized and there was no intent to sell the securities at the reporting date. Such sales are due to issuer-specific events occurring subsequent to the reporting date that result in a change in the Company's intent to sell a fixed maturity security. The types of events that may result in a sale include significant changes in the economic facts and circumstances related to the invested asset, significant unforeseen changes in liquidity needs, or changes in the Company's investment strategy. Net Investment Gains (Losses) by Transaction Type The breakdown of net investment gains (losses) by transaction type for the following periods were as follows: ($ in millions) Three Months Ended 2024 2023 Credit loss impairments $ (0.9) $ — Intent-to-sell impairments — — Total impairments (0.9) — Sales and other, net (0.1) (2.4) Change in fair value - equity securities 2.6 (1.0) Change in fair value and gains (losses) realized on settlements - derivatives 0.6 (0.5) Net investment gains (losses) $ 2.2 $ (3.9) Allowance for Credit Loss Impairments on Fixed Maturity Securities The following table presents changes in the allowance for credit loss impairments on fixed maturity securities classified as available for sale for the category of other asset-backed securities (no other categories of fixed maturity securities have an allowance for credit loss impairments): ($ in millions) Three Months Ended 2024 2023 Beginning balance $ 1.2 $ 1.2 Credit losses on fixed maturity securities for which credit losses were not previously reported 0.9 — Net increase related to credit losses previously reported — — Reduction of credit allowances related to sales — — Write-offs — — Ending balance $ 2.1 $ 1.2 Fixed Maturity Securities The Company's investment portfolio is comprised primarily of fixed maturity securities. Amortized cost, net, gross unrealized investment gains (losses) and fair values of all fixed maturity securities in the portfolio were as follows: ($ in millions) Amortized Gross Unrealized Gross Unrealized Fair March 31, 2024 Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ 746.5 $ 2.9 $ 71.7 $ 677.7 Other, including U.S. Treasury securities 457.6 0.4 66.8 391.2 Municipal bonds 1,282.2 22.6 97.3 1,207.5 Foreign government bonds 23.1 — 1.2 21.9 Corporate bonds 2,041.1 18.5 229.7 1,829.9 Other asset-backed securities 1,234.9 12.3 32.7 1,214.5 Totals $ 5,785.4 $ 56.7 $ 499.4 $ 5,342.7 December 31, 2023 Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ 713.4 $ 4.4 $ 64.6 $ 653.2 Other, including U.S. Treasury securities 450.8 0.8 62.8 388.8 Municipal bonds 1,333.4 28.6 91.9 1,270.1 Foreign government bonds 23.1 — 1.0 22.1 Corporate bonds 1,969.9 23.1 220.3 1,772.7 Other asset-backed securities 1,162.3 6.0 39.9 1,128.4 Totals $ 5,652.9 $ 62.9 $ 480.5 $ 5,235.3 The following table presents the fair value and gross unrealized losses for fixed maturity securities in an unrealized loss position as of March 31, 2024 and December 31, 2023, respectively. The Company views the decrease in fair value of all of the fixed maturity securities with unrealized losses as of March 31, 2024 as due to factors other than a credit loss. As of March 31, 2024, the Company has not made the decision to sell and it is not more likely than not the Company will be required to sell the fixed maturity securities with unrealized losses before a recovery of the amortized cost basis. In reaching our conclusion that an allowance for credit is unnecessary, we considered the factors described in the evaluation of credit loss impairments for fixed maturity securities critical accounting estimate in our Annual Report on Form 10-K. In the current three months ended March 31, 2024, the performance of fixed maturity securities has been impacted by the change in interest rates, specifically interest rates being at relatively high levels compared to interest rates at the time of acquisition of the securities. In consideration of the factors, we expect to receive cash flows sufficient to recover the entire amortized cost basis of the securities in the following table. ($ in millions) 12 Months or Less More than 12 Months Total Fair Value Gross Fair Value Gross Fair Value Gross March 31, 2024 Fixed maturity securities U.S. Government and federally Mortgage-backed securities $ 63.1 $ 1.0 $ 470.4 $ 70.7 $ 533.5 $ 71.7 Other 100.8 1.6 276.6 65.2 377.4 66.8 Municipal bonds 111.7 1.6 704.9 95.7 816.6 97.3 Foreign government bonds 1.4 0.1 20.5 1.1 21.9 1.2 Corporate bonds 252.8 23.5 1,147.4 206.2 1,400.2 229.7 Other asset-backed securities 52.0 0.6 535.4 32.1 587.4 32.7 Total $ 581.8 $ 28.4 $ 3,155.2 $ 471.0 $ 3,737.0 $ 499.4 Number of positions with a gross unrealized loss 298 2,213 2,511 Fair value as a percentage of total fixed maturity securities at fair value 10.9 % 59.1 % 70.0 % December 31, 2023 Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ 45.3 $ 0.8 $ 458.5 $ 63.8 $ 503.8 $ 64.6 Other 39.5 0.4 288.0 62.4 327.5 62.8 Municipal bonds 64.5 0.9 724.6 91.0 789.1 91.9 Foreign government bonds 1.5 — 20.6 1.0 22.1 1.0 Corporate bonds 195.0 25.4 1,171.3 194.9 1,366.3 220.3 Other asset-backed securities 133.4 0.8 752.5 39.1 885.9 39.9 Total $ 479.2 $ 28.3 $ 3,415.5 $ 452.2 $ 3,894.7 $ 480.5 Number of positions with a gross unrealized loss 195 2,305 2,500 Fair value as a percentage of total fixed maturity securities at fair value 9.2 % 65.2 % 74.4 % With regards to fixed maturity securities that had gross unrealized losses more than 12 months, the number of positions by their respective credit ratings were as follows: Number of Positions March 31, 2024 December 31, 2023 Credit Rating AAA 191 226 AA 984 1,006 A 415 423 BBB 437 448 Total investment grade 2,027 2,103 BB 82 93 B 34 39 CCC or lower 8 7 Total below investment grade 124 139 Not rated 62 63 Totals: 2,213 2,305 Fixed maturity securities with an investment grade rating represented 95.9% of the gross unrealized losses as of March 31, 2024. For the same reasons discussed above, we expect to receive cash flow sufficient to recover the entire amortized cost basis of the securities in the previous table. Maturities of Fixed Maturity Securities The following table presents the distribution of the Company’s fixed maturity securities portfolio by estimated expected maturity. Estimated expected maturities differ from contractual maturities, reflecting assumptions regarding borrowers' utilization of the right to call or prepay obligations with or without call or prepayment penalties. For structured securities, estimated expected maturities consider broker-dealer survey prepayment assumptions and are verified for consistency with the interest rate and economic environments. ($ in millions) March 31, 2024 Amortized Fair Percent of Total Fair Value Estimated expected maturity: Due in 1 year or less $ 287.5 $ 283.8 5.3 % Due after 1 year through 5 years 1,480.5 1,438.2 26.9 % Due after 5 years through 10 years 1,496.8 1,425.0 26.7 % Due after 10 years through 20 years 1,475.8 1,321.7 24.7 % Due after 20 years 1,044.8 874.0 16.4 % Total $ 5,785.4 $ 5,342.7 100.0 % Average option-adjusted duration, in years 5.9 Sales of Fixed Maturity and Equity Securities Proceeds received from sales of fixed maturity and equity securities, each determined using the specific identification method, and gross gains and gross losses realized as a result of those sales for each period were as follows: ($ in millions) Three Months Ended 2024 2023 Fixed maturity securities Proceeds received $ 88.0 $ 62.7 Gross gains realized 1.3 0.3 Gross losses realized (1.4) (2.7) Equity securities Proceeds received $ — $ — Gross gains realized — — Gross losses realized — — Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities The following table reconciles net unrealized investment gains (losses) on fixed maturity securities, net of tax, included in AOCI: ($ in millions) Three Months Ended 2024 2023 Net unrealized investment gains (losses) Beginning of period $ (328.3) $ (449.6) Change in net unrealized investment gains (20.5) 91.3 Reclassification of net investment losses 0.8 1.9 End of period $ (348.0) $ (356.4) Limited Partnership Interests Investments in limited partnership interests are accounted for using the equity method of accounting (EMA) and include interests in commercial mortgage loan funds, real estate equity funds, private equity funds, infrastructure equity funds, infrastructure debt funds and other funds. Principal factors influencing carrying amount appreciation or depreciation include operating performance, comparable public company earnings multiples, capitalization rates and the economic environment. The carrying amounts of EMA limited partnership interests were as follows: ($ in millions) March 31, 2024 December 31, 2023 Commercial mortgage loan funds $ 646.2 $ 660.8 Real estate equity funds 103.3 109.2 Private equity funds 95.5 92.7 Infrastructure equity funds 78.0 77.2 Infrastructure debt funds 62.4 59.1 Other funds (1) 133.9 139.8 Total $ 1,119.3 $ 1,138.8 (1) Other funds consist primarily of limited partnership interests in corporate mezzanine, venture capital and private credit funds. Offsetting of Assets and Liabilities The Company's derivatives are subject to enforceable master netting arrangements. Collateral support agreements associated with each master netting arrangement provides that the Company will receive or pledge financial collateral in the event minimum thresholds have been reached. The Company’s reverse repurchase agreements are also subject to enforceable master netting arrangements but there was no offsetting in their presentation in the Company’s Consolidated Balance Sheets. Information regarding the Company's derivatives is contained in Part II - Item 8, Note 4 in the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The following table presents instruments that were subject to a master netting arrangement for the Company. ($ in millions) Gross Net Amounts Gross Amounts Not Offset Gross Financial Cash Net March 31, 2024 Asset derivatives: Free-standing derivatives $ 23.1 $ — $ 23.1 $ — $ 23.6 $ (0.5) December 31, 2023 Asset derivatives: Free-standing derivatives $ 19.0 $ — $ 19.0 $ — $ 18.5 $ 0.5 Reverse Repurchase Agreements In connection with reverse repurchase agreements, the Company transfers primarily U.S. government, government agency and corporate securities and receives cash. For reverse repurchase agreements, the Company receives cash in an amount equal to at least 95% of the fair value of the securities transferred, and the agreements with third parties contain contractual provisions to allow for additional collateral to be obtained when necessary. The Company accounts for reverse repurchase agreements as secured borrowings. The securities transferred under reverse repurchase agreements are included in Fixed maturity securities with the obligation to repurchase those securities reported in Other liabilities on the Company's Consolidated Balance Sheets. The fair value of the securities transferred was $51.8 million as of March 31, 2024 and $0.0 million as of December 31, 2023. The obligation for securities sold under reverse repurchase agreements was a net amount of $50.0 million as of March 31, 2024 and $0.0 million December 31, 2023. Deposits As of March 31, 2024 and December 31, 2023, fixed maturity securities with a fair value of $27.0 million and $29.2 million were on deposit with governmental agencies as required by law in various states for which the insurance subsidiaries of HMEC conduct business. In addition, as of March 31, 2024 and December 31, 2023, fixed maturity securities with a fair value of $1,014.4 million and $987.2 million, respectively, were on deposit with the Federal Home Loan Bank of Chicago (FHLB) as collateral for amounts subject to funding agreements, advances and borrowings which were equal to $929.5 million as of March 31, 2024 and $904.5 million as of December 31, 2023. The deposited securities are reported as Fixed maturity securities on the Company’s Consolidated Balance Sheets.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company is required to disclose estimated fair values for certain financial and nonfinancial assets and liabilities. Fair values of the Company’s insurance contracts other than annuity contracts (which are investment contracts) and EMA limited partnership interests are not required to be disclosed. However, the estimated fair values of liabilities under all insurance contracts are taken into consideration in the Company’s overall management of interest rate risk through appropriate matching of investment maturities with amounts due under insurance contracts. Information regarding the three-level fair value hierarchy presented below and the valuation methodologies utilized by the Company to estimate fair values at each reporting date is included in Part II - Item 8, Note 3 of the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Financial Instruments Measured and Carried at Fair Value on a Recurring Basis The following table presents the Company's fair value hierarchy for financial assets and financial liabilities measured and carried at fair value on a recurring basis. During the three months ended March 31, 2024 and 2023, there were no transfers between Level 1 and Level 2. As of March 31, 2024, Level 3 invested assets comprised 9.2% of the Company’s total investment portfolio at fair value. ($ in millions) Carrying Fair Fair Value Measurements at Level 1 Level 2 Level 3 March 31, 2024 Financial Assets Investments Fixed maturity securities U.S. Government and federally Mortgage-backed securities $ 677.7 $ 677.7 $ — $ 677.7 $ — Other, including U.S. Treasury securities 391.2 391.2 45.0 346.2 — Municipal bonds 1,207.5 1,207.5 — 1,134.3 73.2 Foreign government bonds 21.9 21.9 — 21.9 — Corporate bonds 1,829.9 1,829.9 8.6 1,475.8 345.5 Other asset-backed securities 1,214.5 1,214.5 — 1,125.8 88.7 Total fixed maturity securities 5,342.7 5,342.7 53.6 4,781.7 507.4 Equity securities 84.7 84.7 18.1 64.1 2.5 Short-term investments 69.4 69.4 69.4 — — Other investments 23.1 23.1 — 23.1 — Totals $ 5,519.9 $ 5,519.9 $ 141.1 $ 4,868.9 $ 509.9 Separate Account variable annuity assets (1) $ 3,516.9 $ 3,516.9 $ 3,516.9 $ — $ — Financial Liabilities (2) $ 85.0 $ 85.0 $ — $ 4.2 $ 80.8 December 31, 2023 Financial Assets Investments Fixed maturity securities U.S. Government and federally Mortgage-backed securities $ 653.2 $ 653.2 $ — $ 653.2 $ — Other, including U.S. Treasury securities 388.8 388.8 45.6 343.2 — Municipal bonds 1,270.1 1,270.1 — 1,196.1 74.0 Foreign government bonds 22.1 22.1 — 22.1 — Corporate bonds 1,772.7 1,772.7 10.1 1,420.1 342.5 Other asset-backed securities 1,128.4 1,128.4 — 1,030.9 97.5 Total fixed maturity securities 5,235.3 5,235.3 55.7 4,665.6 514.0 Equity securities 86.2 86.2 17.9 63.8 4.5 Short-term investments 132.9 132.9 132.9 — — Other investments 19.0 19.0 — 19.0 — Totals $ 5,473.4 $ 5,473.4 $ 206.5 $ 4,748.4 $ 518.5 Separate Account (variable annuity) assets (1) $ 3,294.1 $ 3,294.1 $ 3,294.1 $ — $ — Financial Liabilities (2) $ 86.0 $ 86.0 $ — $ 3.6 $ 82.4 (1) Separate Account variable annuity assets represent contractholder funds invested in various actively traded mutual funds that have daily quoted net asset values that are readily determinable for identical assets that the Company can access. Separate Account variable annuity liabilities are equal to the estimated fair value of the Separate Account variable annuity assets. (2) Represents embedded derivatives related to fixed indexed annuity and indexed universal life products reported in Future policy benefit reserves and Other policyholder funds as well as net MRBs reported in Policyholders' account balances in the Company's Consolidated Balance Sheets. Changes in Level 3 Fair Value Measurements The reconciliation for all financial assets and financial liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) were as follows: ($ in millions) Financial Assets Financial Liabilities (1) Municipal Corporate Mortgage-Backed and Other Asset- Backed Securities (2) Total Equity Total Beginning balance, January 1, 2024 $ 74.0 $ 342.5 $ 97.5 $ 514.0 $ 4.5 $ 518.5 $ 82.4 Transfers into Level 3 (3) — — — — — — — Transfers out of Level 3 (3) — (4.4) — (4.4) — (4.4) — Total gains or losses Net investment gains (losses) included in net income — — — — 0.1 0.1 — Net investment (gains) losses included in net income related to financial liabilities — — — — — — 1.3 Net unrealized gains (losses) included in OCI (0.7) (0.6) 2.4 1.1 — 1.1 (0.1) Purchases — 14.1 — 14.1 — 14.1 — Issuances — — — — — — 1.4 Sales — — — — — — — Settlements — — — — — — — Paydowns, maturities and distributions (0.1) (6.1) (11.2) (17.4) (2.1) (19.5) (4.2) Ending balance, March 31, 2024 $ 73.2 $ 345.5 $ 88.7 $ 507.4 $ 2.5 $ 509.9 $ 80.8 Beginning balance, January 1, 2023 $ 54.4 $ 261.3 $ 107.6 $ 423.3 $ 2.0 $ 425.3 $ 91.0 Transfers into Level 3 (3) — 5.9 0.4 6.3 — 6.3 — Transfers out of Level 3 (3) — — — — — — — Total gains or losses Net investment gains (losses) included in net income — — — — — — — Net investment (gains) losses included in net income related to financial liabilities — — — — — — 0.2 Net unrealized gains (losses) included in OCI 1.2 0.9 (0.4) 1.7 — 1.7 — Purchases — 19.0 0.2 19.2 — 19.2 — Issuances — — — — — — 2.1 Sales — (2.6) — (2.6) — (2.6) — Settlements — — — — — — — Paydowns, maturities and distributions (0.2) (0.5) (3.2) (3.9) — (3.9) (3.4) Ending balance, March 31, 2023 $ 55.4 $ 284.0 $ 104.6 $ 444.0 $ 2.0 $ 446.0 $ 89.9 (1) Represents embedded derivatives related to fixed indexed annuity and indexed universal life products reported in Future policy benefit reserves and Other policyholder funds as well as net MRBs reported in Policyholders' account balances in the Company's Consolidated Balance Sheets. (2) Includes U.S. Government and federally sponsored agency obligations for mortgage-backed securities and other asset-backed securities. (3) Transfers into and out of Level 3 during the three months ended March 31, 2024 and 2023 were related to changes in the primary pricing source and changes in observability of external information used in determining fair value. The Company's policy is to recognize transfers into and out of the levels as having occurred at the end of the reporting period in which the transfers were determined. As of March 31, 2024, the Company had a $0.1 million net investment gain on Level 3 financial assets that was included in net income and was attributable to the change in fair value. As of March 31, 2023, the Company had no net investment losses on Level 3 financial assets. For the three months ended March 31, 2024 and 2023, a net investment loss of $1.3 million and $0.2 million , respectively, were included in net income that were attributable to changes in the fair value of Level 3 financial liabilities. Level 3 Assets and Liabilities by Price Source The table below presents the balances of Level 3 assets and liabilities measured at fair value with their corresponding pricing sources: ($ in millions) Total Internal External March 31, 2024 Financial Assets Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ — $ — $ — Municipal bonds 73.2 — 73.2 Corporate bonds 345.5 185.5 160.0 Other asset-backed securities 88.7 — 88.7 Total fixed maturity securities 507.4 185.5 321.9 Equity securities 2.5 — 2.5 Totals $ 509.9 $ 185.5 $ 324.4 Financial Liabilities (1) $ 80.8 $ 80.8 $ — December 31, 2023 Financial Assets Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ — $ — $ — Municipal bonds 74.0 — 74.0 Corporate bonds 342.5 180.4 162.1 Other asset-backed securities 97.5 — 97.5 Total fixed maturity securities 514.0 180.4 333.6 Equity securities 4.5 — 4.5 Totals $ 518.5 $ 180.4 $ 338.1 Financial Liabilities (1) $ 82.4 $ 82.4 $ — (1) Represents embedded derivatives related to fixed indexed annuity and indexed universal life products reported in Future policy benefit reserves and Other policyholder funds as well as net MRBs reported in Policyholders' account balances in the Company's Consolidated Balance Sheets. External pricing sources for securities represent prices from prior transactions or unadjusted third-party pricing information where pricing inputs are not readily available. Quantitative Information about Level 3 Fair Value Measurements The following table provides quantitative information about the significant unobservable inputs for recurring fair value measurements categorized with Level 3. ($ in millions) Fair Value as of March 31, 2024 Valuation Technique(s) Unobservable Inputs Range (Weighted Average) and Single Point Best Estimate (1) Impact of Increase in Input on Fair Value Financial Assets Corporate bonds $ 185.5 discounted cash flow yield 4.5% - 16.2% decrease discounted cash flow option adjusted spread 116 bps - 852 bps decrease Financial Liabilities Derivatives embedded in fixed indexed annuity products $ 87.1 discounted cash flow lapse rate 5.9% decrease mortality multiplier (2) 69.4% decrease option budget 0.9% - 3.8% increase non-performance adjustment (3) 5.0% decrease Net MRBs $ (6.3) discounted cash flow lapse rate 5.9% decrease mortality multiplier (2) 69.4% increase (1) When a range of unobservable inputs is not readily available, the Company uses a single point best estimate. (2) Mortality multiplier is applied to the Annuity 2000 table. (3) Determined as a percentage of the risk-free rate. The valuation techniques and significant unobservable inputs used in the fair value measurement for financial assets and financial liabilities classified as Level 3 are subject to the processes as described in Part II - Item 8, Note 3 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Generally, valuation techniques for corporate bonds include using discounted cash flow techniques where the unobservable input is the yield. The yield used for the valuation of these fixed maturity securities is less observable than securities classified as Level 2. Financial Instruments Not Carried at Fair Value The Company has various other financial assets and financial liabilities used in the normal course of business that are not carried at fair value, but for which fair value disclosure is required. These financial assets and financial liabilities are further described in Part II - Item 8, Note 3 in the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The following table presents the carrying amount and fair value of the Company’s financial assets and financial liabilities not carried at fair value and the level within the fair value hierarchy at which such financial assets and liabilities are categorized. ($ in millions) Carrying Fair Fair Value Measurements at Level 1 Level 2 Level 3 March 31, 2024 Financial Assets Other investments $ 218.7 $ 222.0 $ — $ 34.9 $ 187.1 Deposit asset on reinsurance 2,472.4 2,192.2 — — 2,192.2 Financial Liabilities Policyholders' account balances 5,052.6 4,657.8 — — 4,657.8 Reverse repurchase agreement 50.0 51.8 — 51.8 — Other policyholder funds 941.1 941.1 — 933.7 7.4 Long-term debt 546.2 569.8 — 569.8 — December 31, 2023 Financial Assets Other investments $ 218.4 $ 221.7 $ — $ 33.8 $ 187.9 Deposit asset on reinsurance 2,496.6 2,259.6 — — 2,259.6 Financial Liabilities Policyholders' account balances 4,996.3 4,861.8 — — 4,861.8 Other policyholder funds 916.0 916.0 — 908.7 7.3 Long-term debt 546.0 571.4 — 571.4 —

Short-Duration Insurance Contra

Short-Duration Insurance Contracts	3 Months Ended
	Mar. 31, 2024
Insurance Loss Reserves [Abstract]
Short-Duration Insurance Contracts	Short-Duration Insurance Contracts Property & Casualty Unpaid Claims and Claim Expense Reserves The following table is a summary reconciliation of the beginning and ending Property & Casualty unpaid claims and claim expense reserves for the periods indicated. The table presents reserves on both a gross and net (after reinsurance) basis. The total net Property & Casualty insurance claims and claim expense incurred amounts are reflected in the Consolidated Statements of Operations and Comprehensive Income (Loss). The end of period gross reserves (before reinsurance balances and reinsurance recoverable balances) are reflected on a gross basis in the Consolidated Balance Sheets. ($ in millions) Three Months Ended 2024 2023 Property & Casualty Beginning gross reserves $ 416.8 $ 388.7 Less: reinsurance recoverables 104.0 100.8 Net reserves, beginning of period (1) 312.8 287.9 Incurred claims and claim expenses: Claims occurring in the current period 124.7 128.8 Increase (decrease) in estimated reserves for claims occurring in prior periods (2) — — Total claims and claim expenses incurred 124.7 128.8 Claims and claim expense payments for claims occurring during: Current period 44.6 40.6 Prior periods 78.3 79.6 Total claims and claim expense payments 122.9 120.2 Net reserves, end of period (1) 314.6 296.5 Plus: reinsurance recoverables 103.6 101.3 Ending gross reserves $ 418.2 $ 397.8 (1) Reserves net of expected reinsurance recoverables. (2) Shows the amounts by which the Company increased (decreased) its reserves in each of the periods indicated for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs - also known as prior years' reserve development. There was no prior years' reserve development for Property & Casualty claims for the three months ended March 31, 2024 or March 31, 2023. Group Benefits Unpaid Claims and Claim Expense Reserves The following table is a summary reconciliation of the beginning and ending Group Benefits unpaid claims and claim expense reserves for the periods indicated. The table presents reserves on both a gross and net (after reinsurance). The total net Group Benefits insurance claims and claim expense incurred amounts are reflected in the Consolidated Statements of Operations and Comprehensive Income (Loss). The end of period gross reserves (before reinsurance balances and reinsurance recoverable balances) are reflected on a gross basis in the Consolidated Balance Sheets. ($ in millions) Three Months Ended 2024 2023 Group Benefits Beginning gross reserves $ 116.6 $ 121.6 Less: reinsurance recoverables 27.7 27.9 Net reserves, beginning of period (1) 88.9 93.7 Incurred claims and claim expenses: Claims occurring in the current period 20.2 20.2 Increase (decrease) in estimated reserves for claims occurring in prior periods (2) (6.1) (4.9) Total claims and claim expenses incurred 14.1 15.3 Claims and claim expense payments for claims occurring during: Current period 3.9 4.2 Prior periods 12.4 12.4 Total claims and claim expense payments 16.3 16.6 Net reserves, end of period (1) 86.7 92.3 Plus: reinsurance recoverables 27.6 28.0 Ending gross reserves $ 114.3 $ 120.3 (1) Reserves net of expected reinsurance recoverables. (2) Shows the amounts by which the Company increased (decreased) its reserves in each of the periods indicated for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs - also known as prior years' reserve development. Favorable prior years' reserve development for Group Benefits wa s $6.1 million and $4.9 million f or the three months ended March 31, 2024 and 2023, respectively. The favorable development for the three months ended March 31, 2024 was primarily the result of favorable loss trends in specialty health and group life and disability for loss years 2023 and prior. The favorable development for the three months ended March 31, 2023 was primarily the result of favorable loss trends in specialty health for loss years 2022 and prior. Reconciliation of Property & Casualty and Group Benefits Unpaid Claims and Claim Expense Reserves to the Consolidated Balance Sheets ($ in millions) As of March 31, 2024 As of December 31, 2023 Ending gross reserves Property & Casualty $ 418.2 $ 416.8 Group Benefits 114.3 116.6 Total short-duration insurance contracts 532.5 533.4 Other than short-duration (1) 51.9 48.3 Total unpaid claims and claims expenses $ 584.4 $ 581.7 (1)

Long-Duration Insurance Contrac

Long-Duration Insurance Contracts	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Long-Duration Insurance Contracts	Long-Duration Insurance Contracts Liability for Future Policy Benefits As of and for the three months ended March 31, 2024 and 2023, the Company updated the net premium ratio when updating for actual historical experience for the quarter; future cash flow assumptions were reviewed but not changed. The following tables summarize balances and changes in LFPB for traditional and limited-payment contracts. The balances of and changes in LFPB as of and for the three months ended March 31, 2024 were as follows: ($ in millions) Whole Life Term Life Experience Life (1) Limited-Pay Whole Life Supplemental Health (2) SPIA (life contingent) Present value of expected net premiums: Balance at January 1, 2024 $ 223.2 $ 240.0 $ 71.7 $ 32.2 $ 182.0 $ — January 1, 2024 balance at original discount rate 247.1 256.6 67.0 33.9 213.4 — Effect of: Change in cash flow assumptions — — — — — — Actual variances from expected experience 0.3 0.3 (0.1) 0.2 0.2 — Adjusted balance at January 1, 2024 247.4 256.9 66.9 34.1 213.6 — Issuances (3) 2.5 6.1 — 1.0 5.6 0.6 Interest accruals (4) 1.9 2.6 0.9 0.3 1.6 — Net premiums collected (5) (7.8) (6.2) (1.7) (1.2) (6.2) (0.6) March 31, 2024 balance at original discount rate 244.0 259.4 66.1 34.2 214.6 — Effect of changes in discount rate assumptions (28.5) (21.7) 2.9 (2.3) (35.1) — Balance at March 31, 2024 215.5 237.7 69.0 31.9 179.5 — Present value of expected future policy benefits: Balance at January 1, 2024 522.0 370.1 883.0 89.6 427.6 104.2 January 1, 2024 balance at original discount rate 592.1 405.4 797.5 105.6 517.9 111.4 Effect of: Changes in cash flow assumptions — — — — — — Actual variances from expected experience 0.5 1.0 — 0.1 0.1 0.3 Adjusted balance at January 1, 2024 592.6 406.4 797.5 105.7 518.0 111.7 Issuances 2.5 6.2 — 1.0 5.6 0.6 Interest accruals 4.8 3.9 11.8 1.0 3.6 1.1 Benefit payments (6) (7.9) (5.4) (17.6) (0.4) (16.7) (3.1) March 31, 2024 balance at original discount rate 592.0 411.1 791.7 107.3 510.5 110.3 Effect of changes in discount rate assumptions (88.2) (45.0) 57.9 (20.1) (98.9) (9.0) Balance at March 31, 2024 503.8 366.1 849.6 87.2 411.6 101.3 Net liability for future policy benefits 288.3 128.3 780.6 55.3 231.8 101.3 Less: Reinsurance recoverable (62.5) (19.0) (1.1) (1.1) (3.8) (3.5) Net liability for future policy benefits, after reinsurance recoverable 225.8 109.3 779.5 54.2 228.0 97.8 Impact of flooring on net liability for future policy benefits — — — — — — Net liability for future policy benefits at March 31, 2024 $ 225.8 $ 109.3 $ 779.5 $ 54.2 $ 228.0 $ 97.8 (1) Experience Life contains both whole life and term elements. (2) As of March 31, 2024, the net LFPB for Supplemental Health was $113.1 million for cancer, $20.7 million for accident, $26.5 million for disability and $122.6 million for other supplemental health policies. (3) Issuances are calculated at present value, using the original discount rate, of the expected net premiums or the expected future policy benefits related to new policies issued during the current period. (4) Interest accruals represent the interest earned on the beginning present value of either the expected net premiums or the expected future policy benefits using the original interest rate. (5) Net premiums collected represent the product of the current period net premium ratio and the gross premiums collected during the period of in force business. (6) Benefit payments represent the release of the present value, using the original discount rate, of the expected future policy benefits due to death, lapse/withdrawal and maturity payments based on revised expected assumptions. The balances of and changes in LFPB as of and for the year ended December 31, 2023 were as follows: ($ in millions) Whole Life Term Life Experience Life (1) Limited-Pay Whole Life Supplemental Health (2) SPIA (life contingent) Present value of expected net premiums: Balance at January 1, 2023 $ 215.1 $ 234.7 $ 68.3 $ 29.7 $ 167.4 $ — January 1, 2023 balance at original discount rate 245.9 265.4 65.5 32.4 205.1 — Effect of: Change in cash flow assumptions — (16.8) 3.7 (0.2) 6.5 — Actual variances from expected experience 3.8 (2.7) 0.7 1.0 (1.6) — Adjusted balance at January 1, 2023 249.7 245.9 69.9 33.2 210.0 — Issuances (3) 10.8 25.2 — 4.3 19.4 5.6 Interest accruals (4) 7.2 10.3 3.7 1.2 6.0 — Net premiums collected (5) (20.6) (24.8) (6.6) (4.8) (22.0) (5.6) December 31, 2023 balance at original discount rate 247.1 256.6 67.0 33.9 213.4 — Effect of changes in discount rate assumptions (23.9) (16.6) 4.7 (1.7) (31.4) — Balance at December 31, 2023 223.2 240.0 71.7 32.2 182.0 — Present value of expected future policy benefits: Balance at January 1, 2023 493.6 347.0 867.5 79.4 431.7 103.3 January 1, 2023 balance at original discount rate 581.9 401.0 805.2 98.6 537.1 113.4 Effect of: Changes in cash flow assumptions (0.6) (16.7) 5.0 (0.2) 8.9 — Actual variances from expected experience 4.0 1.3 1.1 1.0 (2.4) (0.8) Adjusted balance at January 1, 2023 585.3 385.6 811.3 99.4 543.6 112.6 Issuances 10.7 25.8 — 4.3 19.4 6.3 Interest accruals 19.0 15.2 47.4 3.9 14.4 4.4 Benefit payments (6) (22.9) (21.2) (61.2) (2.0) (59.5) (11.9) December 31, 2023 balance at original discount rate 592.1 405.4 797.5 105.6 517.9 111.4 Effect of changes in discount rate assumptions (70.1) (35.3) 85.5 (16.0) (90.3) (7.2) Balance at December 31, 2023 522.0 370.1 883.0 89.6 427.6 104.2 Net liability for future policy benefits 298.8 130.2 811.3 57.4 245.6 104.2 Less: Reinsurance recoverable (64.3) (19.1) (1.0) (1.2) (4.0) (3.6) Net liability for future policy benefits, after reinsurance recoverable 234.5 111.1 810.3 56.2 241.6 100.6 Impact of flooring on net liability for future policy benefits — — — — — — Net liability for future policy benefits at December 31, 2023 $ 234.5 $ 111.1 $ 810.3 $ 56.2 $ 241.6 $ 100.6 (1) Experience Life contains both whole life and term elements. (2) As of December 31, 2023, the net LFPB for Supplemental Health was $92.7 million for cancer, $21.4 million for accident, $23.5 million for disability and $104.0 million for other supplemental health policies. (3) Issuances are calculated at present value, using the original discount rate, of the expected net premiums or the expected future policy benefits related to new policies issued during the current period. (4) Interest accruals represent the interest earned on the beginning present value of either the expected net premiums or the expected future policy benefits using the original interest rate. (5) Net premiums collected represent the product of the current period net premium ratio and the gross premiums collected during the period of in force business. (6) Benefit payments represent the release of the present value, using the original discount rate, of the expected future policy benefits due to death, lapse/withdrawal and maturity payments based on revised expected assumptions. The following table reconciles the net LFPB to LFPB in the Consolidated Balance Sheets. DPL for single premium and immediate annuity products is presented together with LFPB in the Consolidated Balance Sheets: ($ in millions) March 31, 2024 December 31, 2023 Whole life $ 288.3 $ 298.8 Term life 128.3 130.2 Experience life 780.6 811.3 Limited-pay whole life 55.3 57.4 Supplemental health 231.8 245.6 SPIA (life contingent) 101.3 104.2 Limited-pay whole life DPL 4.3 4.1 SPIA (life contingent) DPL 1.3 1.3 Reconciling items (1) 110.9 108.9 Total $ 1,702.1 $ 1,761.8 (1) Reconciling items primarily relate to products not in scope of ASU 2018-12 and return of premium reserves. The following table summarizes the amount of revenue and interest related to traditional and limited-payment contracts recognized in the Consolidated Statements of Operations and Comprehensive Income (Loss): ($ in millions) Gross premiums or assessments Three Months Ended March 31, 2024 2023 Whole life $ 6.9 $ 6.6 Term life 11.2 10.8 Experience life 7.7 8.2 Limited-pay whole life 1.8 1.6 Supplemental health 30.4 29.7 SPIA (life contingent) 1.2 2.2 Total $ 59.2 $ 59.1 ($ in millions) Interest expense Three Months Ended March 31, 2024 2023 Whole life $ 3.0 $ 2.9 Term life 1.3 1.2 Experience life 10.8 11.0 Limited-pay whole life 0.7 0.6 Supplemental health 2.0 2.2 SPIA (life contingent) 1.1 1.1 Total $ 18.9 $ 19.0 The following table provides the amount of undiscounted and discounted expected gross premiums and expected future benefits and expenses for traditional and limited-payment contracts: ($ in millions) As of March 31, 2024 As of December 31, 2023 Undiscounted Discounted Undiscounted Discounted Whole life Expected future gross premiums $ 473.5 $ 323.0 $ 478.8 $ 325.0 Expected future benefits and expenses 1,151.5 592.0 1,152.8 592.1 Term life Expected future gross premiums 695.7 452.3 689.0 449.4 Expected future benefits and expenses 694.7 411.1 682.7 405.4 Experience Life Expected future gross premiums 519.4 290.6 530.0 296.1 Expected future benefits and expenses 1,684.3 791.7 1,703.1 797.5 Limited-pay whole life Expected future gross premiums 65.6 49.6 64.7 49.1 Expected future benefits and expenses 249.2 107.3 244.9 105.6 Supplemental health Expected future gross premiums 1,619.2 1,187.4 1,624.1 1,192.5 Expected future benefits and expenses 712.7 510.5 719.4 517.9 SPIA (life contingent) Expected future gross premiums — — — — Expected future benefits and expenses 155.0 110.3 156.1 111.4 For the three months ended March 31, 2024 and for the year ended December 31, 2023, net premiums exceeded gross premiums for several cohorts in the Whole Life and Term Life product lines. This resulted in an immaterial change to current period benefit expense for both periods. The following table summarizes the ranges of actual experience and expected experience for mortality and lapses of LFPB: March 31, 2024 Whole Life Term Life Experience Life Limited-Pay Whole Life SPIA (life contingent) Mortality Actual experience 0.7 % 0.1% - 0.2% 2.1 % — % N.M. Expected experience 0.7 % 0.1% - 0.4% 1.7 % 0.3 % N.M. Lapses Actual experience 3.4 % 3.6% - 22.0% 3.4 % 3.6 % N.M. Expected experience 4.3 % 5.1% - 6.9% 3.0 % 4.6 % N.M. March 31, 2023 Whole Life Term Life Experience Life Limited-Pay Whole Life SPIA (life contingent) Mortality Actual experience 0.7 % 0.1% - 0.3% 1.9 % — % N.M. Expected experience 0.7 % 0.1% - 0.6% 1.6 % 0.2 % N.M. Lapses Actual experience 3.6 % 5.6% - 8.3% 3.4 % 3.6 % N.M. Expected experience 4.6 % 2.8% - 5.6% 3.0 % 5.1 % N.M. The following table provides the weighted-average durations of LFPB, in years: As of March 31, 2024 2023 Whole life 17.9 18.0 Term life 16.6 17.0 Experience life 10.3 11.0 Limited-pay whole life 21.9 23.0 Supplemental health 10.8 10.2 SPIA (life contingent) 7.6 8.0 The following table provides ranges of the weighted-average interest rates for LFPB: As of March 31, 2024 2023 Whole life Interest accretion rate 1.7% - 4.9% 1.7% - 4.9% Current discount rate 4.6% - 5.4% 4.7% - 5.0% Term life Interest accretion rate 4.2% - 4.2% 4.1% - 4.3% Current discount rate 5.2% - 5.3% 4.9% - 5.0% Experience life Interest accretion rate 6.1 % 6.1 % Current discount rate 5.3 % 5.0 % Limited-pay whole life Interest accretion rate 4.0 % 3.9 % Current discount rate 5.4 % 5.0 % Supplemental health Interest accretion rate 1.7% - 2.7% 1.7% - 2.7% Current discount rate 5.3% - 5.4% 5.0% - 5.2% SPIA (life contingent) Interest accretion rate 1.7% - 4.1% 1.7% - 4.1% Current discount rate 5.2% - 5.2% 4.9% - 5.0% Liability for Policyholders' Account Balances The Company recognizes a liability for policyholders' account balances. The following tables summarize balances of and changes in policyholders' account balances: ($ in millions) Three Months Ended March 31, 2024 Indexed Universal Life Experience Life Fixed Account Annuities Fixed Indexed Account Annuities SPIA (non-life contingent) Balance at January 1, 2024 $ 57.8 $ 61.2 $ 4,556.0 $ 449.0 $ 32.6 Premiums received (1) $ 3.9 $ (0.1) $ 49.0 $ 3.6 $ 0.8 Surrenders and withdrawals (2) (0.5) (1.3) (112.2) (13.3) (0.6) Benefit payments (3) — (0.5) (20.6) (0.8) (1.4) Net transfers from (to) separate account (0.1) — 1.9 (0.8) — Interest credited (4) 0.8 0.7 41.7 2.7 0.2 Other (0.9) 0.1 4.1 (3.0) — Balance at March 31, 2024 $ 61.0 $ 60.1 $ 4,519.9 $ 437.4 $ 31.6 Weighted-average crediting rate 5.6 % 4.9 % 3.7 % 2.5 % 3.1 % Net amount at risk (5) $ — $ — $ 32.0 $ — $ — Cash surrender value $ 43.3 $ 59.5 $ 4,468.2 $ 428.4 $ 31.4 ($ in millions) Three Months Ended March 31, 2023 Indexed Universal Life Experience Life Fixed Account Annuities Fixed Indexed Account Annuities SPIA (non-life contingent) Balance at January 1, 2023 $ 47.6 $ 64.3 $ 4,591.1 $ 510.3 $ 34.4 Premiums received (1) $ 3.6 $ (0.2) $ 54.9 $ 5.1 $ 1.1 Surrenders and withdrawals (2) (0.4) (0.9) (98.1) (13.9) (0.1) Benefit payments (3) — (0.5) (19.1) (0.6) (1.7) Net transfers from (to) separate account — — 6.6 (0.9) — Interest credited (4) — 0.8 40.1 — 0.3 Other (0.9) — 1.9 (1.6) (0.2) Balance at March 31, 2023 $ 49.9 $ 63.5 $ 4,577.4 $ 498.4 $ 33.8 Weighted-average crediting rate 0.1 % 5.0 % 3.6 % — % 3.0 % Net amount at risk (5) $ — $ — $ 39.5 $ — $ — Cash surrender value $ 32.9 $ 62.8 $ 4,540.9 $ 486.7 $ 33.7 (1) Premiums received represents premiums collected from policyholder during the period of in force business. (2) Surrenders and withdrawals represent reductions to the policyholders' account balance due to policyholders surrendering the policy or withdrawing funds from the account balance. (3) Benefit payments represent benefits due under contract that were paid to a policyholder during the periods. (4) Interest credited represents interest earned and credited to policyholders' account balance during the periods. (5) Net amount at risk represents guaranteed benefit amounts less current policyholders' account balance at the reporting date. The following table reconciles policyholders' account balances to the policyholders' account balance liability in the Consolidated Balances Sheets: ($ in millions) March 31, 2024 December 31, 2023 Indexed universal life $ 61.0 $ 57.8 Experience Life 60.1 61.2 Fixed account annuities 4,519.9 4,556.0 Fixed indexed account annuities 437.4 449.0 SPIA (non-life contingent) 31.6 32.6 Reconciling items (1) 27.6 30.4 Total $ 5,137.6 $ 5,187.0 (1) Reconciling items primarily relate to FIA reserves net of account balances, miscellaneous fixed annuity reserves, personal promise accounts and MRBs. The following tables present the gross account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders and the respective guaranteed minimums: ($ in millions) March 31, 2024 At Guaranteed Minimum 1-50 Basis Points Above 51-150 Basis Points Above Greater Than 150 Basis Points Above Total (1) Guaranteed minimum crediting rates: Less than 2% $ 22.4 $ 114.3 $ 506.5 $ 216.5 $ 859.7 Equal to 2% but less than 3% 132.2 101.2 77.1 107.8 418.3 Equal to 3% but less than 4% 546.4 42.2 0.7 — 589.3 Equal to 4% but less than 5% 2,644.1 — — — 2,644.1 5% or higher 85.6 — — — 85.6 Total $ 3,430.7 $ 257.7 $ 584.3 $ 324.3 $ 4,597.0 ($ in millions) December 31, 2023 At Guaranteed Minimum 1-50 Basis Points Above 51-150 Basis Points Above Greater Than 150 Basis Points Above Total (1) Guaranteed minimum crediting rates: Less than 2% $ 36.7 $ 159.8 $ 489.4 $ 200.2 $ 886.1 Equal to 2% but less than 3% 162.9 77.9 65.8 76.1 382.7 Equal to 3% but less than 4% 571.3 36.9 0.7 — 609.0 Equal to 4% but less than 5% 2,670.5 — — — 2,670.5 5% or higher 86.9 — — — 86.9 Total $ 3,528.3 $ 274.6 $ 555.9 $ 276.3 $ 4,635.2 (1) Excludes products not containing a fixed guaranteed minimum crediting rate. Separate Account Liabilities Separate account assets and liabilities consist of investment accounts established and maintained by the Company for certain variable contracts. Some of these variable contracts include minimum guarantees such as GMDBs that guarantee a minimum payment to the policyholder in the event of death. The assets that support variable contracts are measured at fair value and are reported as separate account assets on the Consolidated Balance Sheets. An equivalent amount is reported as separate account liabilities. MRB assets and liabilities for minimum guarantees are valued and presented separately from separate account assets and separate account liabilities. MRBs are discussed further in the market risk benefits section of this Note to the Consolidated Financial Statements. Policy charges assessed against the policyholders for mortality, administration and other services are included in the life premiums and contract charges line item on the Consolidated Statements of Operations and Comprehensive Income (Loss). The following table presents the balances of and changes in the Separate Account variable annuity liabilities presented in the Consolidated Balance Sheets (1) : ($ in millions) Retirement Services Variable Account Annuities March 31, 2024 December 31, 2023 Balance, beginning of year $ 3,294.1 $ 2,792.3 Deposits 59.3 234.2 Withdrawals (69.7) (213.4) Net transfers (1.1) (15.5) Fees and charges (12.3) (37.6) Market appreciation (depreciation) 246.6 541.5 Other — (7.4) Balance, end of period $ 3,516.9 $ 3,294.1 (1) The Separate Account variable annuity liabilities are backed by, and are equal to, the Separate Account variable annuity assets that represent contractholder funds invested in various actively traded mutual funds that have daily quoted net asset values that are readily determinable for identical assets that the Company can access. Market Risk Benefits The following table presents the balances of and changes in MRBs associated with deferred variable annuities as of and for the three months ended March 31, 2024 and 2023, respectively: ($ in millions) Three Months Ended 2024 2023 Balance, beginning of period $ (3.9) $ 0.2 Balance, beginning of period, before effects of changes in the instrument-specific credit risk (4.5) — Changes in market risk benefits (1) (2.3) 0.9 Balance, end of period (2) $ (6.8) $ 0.9 Effect of changes in the instrument-specific credit risk 0.5 0.4 Balance, end of period $ (6.3) $ 1.3 Net amount at risk (3) $ 16.6 $ 38.3 Weighted-average attained age of contract holders 62 63 (1) Reflects interest accruals and effect of changes in interest rates, equity markets, equity index volatility and future assumptions. (2) Balance, end of period, before the effect of changes in the instrument-specific credit risk. (3) Net amount at risk represents the current guaranteed benefit less current account balance at the reporting date. The following table presents MRBs by amounts in an asset position and amounts in a liability position. The net liabilities (assets) are included in Policyholders' account balances presented in the Consolidated Balance Sheets. ($ in millions) As of March 31, 2024 As of December 31, 2023 (Asset) Liability Net (Asset) Liability Net Deferred variable annuities $ (8.3) $ 2.0 $ (6.3) $ (6.7) $ 2.8 $ (3.9) Deferred Acquisition Costs The following tables roll-forward DAC for the periods indicated: ($ in millions) Three Months Ended March 31, 2024 Whole Life Term Life Experience Life Limited-Pay Whole Life Indexed Universal Life Supplemental Health Total Annuities Balance, beginning of period $ 22.3 $ 32.6 $ 5.7 $ 7.4 $ 16.8 $ 8.2 $ 214.0 Capitalizations 0.7 1.2 0.1 0.2 0.7 0.8 3.9 Amortization expense (0.3) (0.9) (0.1) (0.1) (0.3) (0.2) (3.7) Experience adjustment (0.1) — — — (0.1) (0.1) (1.3) Balance, end of period $ 22.6 $ 32.9 $ 5.7 $ 7.5 $ 17.1 $ 8.7 $ 212.9 ($ in millions) Three Months Ended March 31, 2023 Whole Life Term Life Experience Life Limited-Pay Whole Life Indexed Universal Life Supplemental Health Total Annuities Balance, beginning of period $ 20.9 $ 30.0 $ 5.8 $ 6.7 $ 15.4 $ 6.2 $ 221.1 Capitalizations 0.6 1.3 — 0.2 0.5 0.6 4.0 Amortization expense (0.3) (0.6) — (0.1) (0.2) (0.1) (3.7) Experience adjustment — — — — — — (1.7) Balance, end of period $ 21.2 $ 30.7 $ 5.8 $ 6.8 $ 15.7 $ 6.7 $ 219.7 The following table presents a reconciliation of DAC to the Consolidated Balance Sheets: ($ in millions) March 31, 2024 December 31, 2023 Whole life $ 22.6 $ 22.3 Term life 32.9 32.6 Experience life 5.7 5.7 Limited pay whole life 7.5 7.4 Indexed universal life 17.1 16.8 Supplemental health 8.7 8.2 Total annuities 212.9 214.0 Reconciling item (1) 29.9 29.3 Total $ 337.3 $ 336.3 (1) Reconciling item relates to DAC associated with the Property & Casualty reporting segment. The assumptions used to amortize DAC were consistent with the assumptions used to estimate LFPB for traditional and limited-payment contracts. The underlying assumptions for DAC and LFPB were updated at the same time. In the first quarter of 2024 and 2023, the Company conducted a review of all significant assumptions and did not make any changes to future assumptions because actual experience for mortality and lapses was materially consistent with underlying assumptions.

Reinsurance

Reinsurance	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Reinsurance	Reinsurance The Company recognizes the cost of reinsurance premiums over the contract periods for such premiums in proportion to the insurance protection provided. Amounts recoverable from reinsurers for unpaid claims and claim settlement expenses, including estimated amounts for unsettled claims, claims incurred but not yet reported and policy benefits, are estimated in a manner consistent with the insurance liability associated with the policy. The effects of reinsurance on net premiums written and contract deposits; net premiums and contract charges earned; and benefits, claims and settlement expenses were as follows: ($ in millions) Direct Ceded to Other Companies (1) Assumed Net Three months ended March 31, 2024 Net premiums written and contract deposits (2) $ 386.4 $ 18.1 $ 7.3 $ 375.6 Net premiums and contract charges earned 288.0 19.8 7.0 275.2 Benefits, claims and settlement expenses 186.9 14.6 4.0 176.3 Three months ended March 31, 2023 Net premiums written and contract deposits (2) $ 367.8 $ 16.6 $ 10.4 $ 361.6 Net premiums and contract charges earned 264.0 18.5 10.4 255.9 Benefits, claims and settlement expenses 192.9 12.7 3.0 183.2 (1) Excludes the annuity reinsurance transaction accounted for using the deposit method. (2) This measure is not based on accounting principles generally accepted in the United States of America (non-GAAP). An explanation of this non-GAAP measure is contained in the Glossary of Selected Terms included as Exhibit 99.1 in the Company's reports filed with the SEC.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information The Company conducts and manages its business in four reporting segments. The three operating segments, representing the major lines of business, are: (1) Property & Casualty (primarily personal lines of auto and property insurance products), (2) Life & Retirement (primarily tax-qualified fixed and variable annuities as well as life insurance products), and (3) Supplemental & Group Benefits (primarily cancer, heart, hospital, supplemental disability, accident, short-term and long-term group disability, and group term life coverages). The Company does not allocate the impact of corporate-level transactions to these operating segments, consistent with the basis for management's evaluation of the results of those segments, but classifies those items in the fourth reporting segment, Corporate & Other. In addition to ongoing transactions such as corporate debt service, net investment gains (losses) and certain public company expenses, such items in Corporate & Other have also included corporate debt retirement costs, when applicable. Summarized financial information for these segments is as follows: ($ in millions) Three Months Ended 2024 2023 Net premiums and contract charges earned Property & Casualty $ 173.2 $ 152.4 Life & Retirement 37.8 37.7 Supplemental & Group Benefits 64.2 65.8 Total $ 275.2 $ 255.9 Net investment income Property & Casualty $ 12.3 $ 4.0 Life & Retirement 85.8 87.9 Supplemental & Group Benefits 7.8 9.1 Corporate & Other — — Intersegment eliminations (0.5) (0.6) Total $ 105.4 $ 100.4 Net income (loss) Property & Casualty $ 10.6 $ (11.6) Life & Retirement 11.7 14.0 Supplemental & Group Benefits 11.0 14.0 Corporate & Other (6.8) (9.8) Total $ 26.5 $ 6.6 ($ in millions) March 31, 2024 December 31, 2023 Assets Property & Casualty $ 1,229.2 $ 1,218.1 Life & Retirement 11,568.3 11,365.0 Supplemental & Group Benefits 1,319.4 1,338.8 Corporate & Other 184.7 190.4 Intersegment eliminations (65.3) (62.4) Total $ 14,236.3 $ 14,049.9

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) AOCI represents the accumulated change in shareholders’ equity from transactions and other events and circumstances from non-shareholder sources. For the Company, AOCI includes the after tax change in net unrealized investment gains (losses) on fixed maturity securities, the after tax change in net reserve remeasurements attributable to discount rates and the after tax change in net funded status of benefit plans for the periods as shown in the Consolidated Statements of Changes in Shareholders’ Equity. The following table reconciles these components. ($ in millions) Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities (1) Net Reserve Remeasurements Attributable to Discount Rates (1) Net Funded Status of Benefit Plans (1) Total (1) Beginning balance, January 1, 2024 $ (328.3) $ 21.9 $ (7.6) $ (314.0) Other comprehensive income (loss) before reclassifications (20.5) 41.4 — 20.9 Amounts reclassified from AOCI (2) 0.8 — — 0.8 Net current period other comprehensive income (loss) (19.7) 41.4 — 21.7 Ending balance, March 31, 2024 $ (348.0) $ 63.3 $ (7.6) $ (292.3) Beginning balance, January 1, 2023 $ (449.6) $ 59.0 $ (8.8) $ (399.4) Other comprehensive income (loss) before reclassifications 91.3 (41.2) — 50.1 Amounts reclassified from AOCI (2) 1.9 — — 1.9 Net current period other comprehensive income (loss) 93.2 (41.2) — 52.0 Ending balance, March 31, 2023 $ (356.4) $ 17.8 $ (8.8) $ (347.4) (1) All amounts are net of tax. (2) The pretax amounts reclassified from AOCI, $(1.0) million and $(2.4) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.2) million and $(0.5) million, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2024 and 2023, respectively. Comparative information for elements that are not required to be reclassified in their entirety to net income in the same reporting period is disclosed in Note 2.

Supplemental Consolidated Cash

Supplemental Consolidated Cash and Cash Flow Information	3 Months Ended
	Mar. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Supplemental Consolidated Cash and Cash Flow Information	Supplemental Consolidated Cash and Cash Flow Information ($ in millions) March 31, 2024 December 31, 2023 Cash $ 19.8 $ 29.0 Restricted cash 0.6 0.7 Total cash and restricted cash reported in the Consolidated Balance Sheets $ 20.4 $ 29.7 ($ in millions) Three Months Ended 2024 2023 Cash paid for: Interest $ 11.0 $ 1.2 Income taxes — 0.1 Non-cash activities were not material for the three months ended March 31, 2024 and 2023, respectively.

Contingencies and Commitments

Contingencies and Commitments	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Contingencies and Commitments Lawsuits and Legal Proceedings Companies in the insurance industry have been subject to substantial litigation resulting from claims, disputes and other matters. For instance, they have faced expensive claims, including class action lawsuits, alleging, among other things, improper sales practices and improper claims settlement procedures. Negotiated settlements of certain such actions have had a material adverse effect on many insurance companies. At the time of issuance of this Interim Report on Form 10-Q, except as noted below, the Company does not have pending litigation from which there is a reasonable possibility of material loss. In 2023, the Horace Mann Insurance Company (HMIC) was named as a defendant in one lawsuit and received various demands for reimbursement and notices of claims related to legacy, long-tail commercial lines claims, including asbestos, environmental, and sexual molestation claims. It is alleged that HMIC reinsured certain commercial lines policies as a member of various insurance pooling arrangements in the late 1960s and early 1970s. The related policies were written prior to the 1975 acquisition of Horace Mann by INA discussed in Part I - Item 1 of the Annual Report on Form 10-K. HMEC’s available records indicate that on January 1, 1975, HMIC entered a quota share retrocession treaty with INA. It is the Company’s understanding that claims arising under these legacy policies were handled by various third parties pursuant to the terms of that treaty and its subsequent amendments entered into on behalf of HMIC. Ultimately, after amendments to the treaty and various corporate transactions involving the reinsurer, these obligations were assumed by companies that were affiliated with R&Q Reinsurance Company (R&Q). The matters noted above arose following the March 23, 2023, Order of Liquidation in Pennsylvania of R&Q. HMIC is defending itself against the pending litigation and is in the process of investigating and evaluating the other demands and claims notices under a complete reservation of rights. In addition, in order to preserve its rights, HMIC submitted a proof of claim in the pending R&Q liquidation proceeding. The amounts claimed against HMIC, if successful, could be material. However, based on the preliminary nature of the matters, the information available to date and considering the legal and factual challenges to the litigation and claims, it is not possible to provide a reasonable estimate of any resultant payment. Investment Commitments The Company has outstanding commitments to fund investments primarily in limited partnership interests. Such unfunded commitments were $524.6 million and $502.6 million as of March 31, 2024 and December 31, 2023, respectively.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net income (loss)	$ 26.5	$ 6.6

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Marita Zuraitis [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	During the three months ended March 31, 2024, Marita Zuraitis adopted a new 10b5-1 plan. The Plan was adopted on March 14, 2024. The Plan expires on the earlier of March 31, 2025, or upon execution of all trades or expiration of all orders relating to such trades. The Plan allows for the sale of up to 32,000 shares and the exercise of up to 28,051 vested options.
Name	Marita Zuraitis
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 14, 2024
Arrangement Duration	382 days
Marita Zuraitis Trading Arrangement, Shares [Member] | Marita Zuraitis [Member]
Trading Arrangements, by Individual
Aggregate Available	32,000
Marita Zuraitis Trading Arrangement, Vested Options [Member] | Marita Zuraitis [Member]
Trading Arrangements, by Individual
Aggregate Available	28,051

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP) and with the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and disclosures normally included in annual financial statements prepared in conformity with GAAP, but are not required for interim reporting purposes, have been omitted. These Consolidated Financial Statements and Notes thereto should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in Part II - Item 8 of the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The results of operations for the three months ended March 31, 2024 are not necessarily indicative of the results to be expected for the full year. The accompanying Consolidated Financial Statements and Notes thereto are unaudited and reflect all adjustments (generally consisting only of normal recurring accruals) which are, in the opinion of management, necessary for the fair presentation of the consolidated financial position, results of operations and cash flows for the interim periods. The Company's significant accounting policies are summarized in Part II - Item 8, Note 1 of the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The Company has reclassified the presentation of certain prior period information to conform to the current year's presentation.
Consolidation	Consolidation All intercompany transactions and balances between HMEC and its subsidiaries and affiliates have been eliminated.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the reporting date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. The most significant critical accounting estimates include valuation of hard-to-value fixed maturity securities, evaluation of credit loss impairments for fixed maturity securities, valuation of future policy benefit reserves, and valuation of liabilities for property and casualty unpaid claims and claim expense reserves.
Future Adoption of New Accounting Standards	Future Adoption of New Accounting Standards Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This update will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 includes: 1) a requirement to disclose 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, 2) a requirement to disclose an amount for other segment items by reportable segment and a description of its composition, 3) a requirement to disclose a reportable segments profit or loss and assets currently required by Topic 280 in interim periods, 4) clarifies that in addition to the measure that is most consistent with the measurement principles under generally accepted accounting principles (GAAP), a public entity is not precluded from reporting additional measures of a segment's profit or loss that are used by the CODM in assessing segment performance and deciding how to allocate resources, and 5) a requirement to disclose 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. This guidance will be effective for the Company for annual periods beginning after December 15, 2023 and interim periods beginning after December 15, 2024. Early adoption is permitted. The guidance will have no net impact on the Company's consolidated financial position, results of operations, or cash flows. Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This update will improve 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. This guidance will be effective for the Company for annual periods beginning after December 15, 2024 and interim periods beginning after December 15, 2025. Early adoption is permitted. The guidance will have no net impact on the Company's consolidated financial position, results of operations, or cash flows.

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Components of Net Investment	The components of net investment income for the following periods were as follows: ($ in millions) Three Months Ended 2024 2023 Fixed maturity securities $ 70.4 $ 67.7 Equity securities 1.2 2.7 Limited partnership interests 6.2 4.4 Short-term and other investments 4.7 3.5 Investment expenses (2.6) (3.6) Net investment income - investment portfolio 79.9 74.7 Investment income - deposit asset on reinsurance 25.5 25.7 Total net investment income $ 105.4 $ 100.4
Schedule of Net Investment Gains (Losses)	Net investment gains (losses) for the following periods were as follows: ($ in millions) Three Months Ended 2024 2023 Fixed maturity securities $ (1.0) $ (2.4) Equity securities 2.6 (1.0) Short-term investments and other 0.6 (0.5) Net investment gains (losses) $ 2.2 $ (3.9) The breakdown of net investment gains (losses) by transaction type for the following periods were as follows: ($ in millions) Three Months Ended 2024 2023 Credit loss impairments $ (0.9) $ — Intent-to-sell impairments — — Total impairments (0.9) — Sales and other, net (0.1) (2.4) Change in fair value - equity securities 2.6 (1.0) Change in fair value and gains (losses) realized on settlements - derivatives 0.6 (0.5) Net investment gains (losses) $ 2.2 $ (3.9)
Schedule of Allowance for Credit Loss Impairments on Fixed Maturity Securities	The following table presents changes in the allowance for credit loss impairments on fixed maturity securities classified as available for sale for the category of other asset-backed securities (no other categories of fixed maturity securities have an allowance for credit loss impairments): ($ in millions) Three Months Ended 2024 2023 Beginning balance $ 1.2 $ 1.2 Credit losses on fixed maturity securities for which credit losses were not previously reported 0.9 — Net increase related to credit losses previously reported — — Reduction of credit allowances related to sales — — Write-offs — — Ending balance $ 2.1 $ 1.2
Schedule of Available-for-sale Securities Reconciliation	Amortized cost, net, gross unrealized investment gains (losses) and fair values of all fixed maturity securities in the portfolio were as follows: ($ in millions) Amortized Gross Unrealized Gross Unrealized Fair March 31, 2024 Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ 746.5 $ 2.9 $ 71.7 $ 677.7 Other, including U.S. Treasury securities 457.6 0.4 66.8 391.2 Municipal bonds 1,282.2 22.6 97.3 1,207.5 Foreign government bonds 23.1 — 1.2 21.9 Corporate bonds 2,041.1 18.5 229.7 1,829.9 Other asset-backed securities 1,234.9 12.3 32.7 1,214.5 Totals $ 5,785.4 $ 56.7 $ 499.4 $ 5,342.7 December 31, 2023 Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ 713.4 $ 4.4 $ 64.6 $ 653.2 Other, including U.S. Treasury securities 450.8 0.8 62.8 388.8 Municipal bonds 1,333.4 28.6 91.9 1,270.1 Foreign government bonds 23.1 — 1.0 22.1 Corporate bonds 1,969.9 23.1 220.3 1,772.7 Other asset-backed securities 1,162.3 6.0 39.9 1,128.4 Totals $ 5,652.9 $ 62.9 $ 480.5 $ 5,235.3
Schedule of Fair Value and Gross Unrealized Losses of Fixed Maturity Securities and Equity Securities in an Unrealized Loss Position	($ in millions) 12 Months or Less More than 12 Months Total Fair Value Gross Fair Value Gross Fair Value Gross March 31, 2024 Fixed maturity securities U.S. Government and federally Mortgage-backed securities $ 63.1 $ 1.0 $ 470.4 $ 70.7 $ 533.5 $ 71.7 Other 100.8 1.6 276.6 65.2 377.4 66.8 Municipal bonds 111.7 1.6 704.9 95.7 816.6 97.3 Foreign government bonds 1.4 0.1 20.5 1.1 21.9 1.2 Corporate bonds 252.8 23.5 1,147.4 206.2 1,400.2 229.7 Other asset-backed securities 52.0 0.6 535.4 32.1 587.4 32.7 Total $ 581.8 $ 28.4 $ 3,155.2 $ 471.0 $ 3,737.0 $ 499.4 Number of positions with a gross unrealized loss 298 2,213 2,511 Fair value as a percentage of total fixed maturity securities at fair value 10.9 % 59.1 % 70.0 % December 31, 2023 Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ 45.3 $ 0.8 $ 458.5 $ 63.8 $ 503.8 $ 64.6 Other 39.5 0.4 288.0 62.4 327.5 62.8 Municipal bonds 64.5 0.9 724.6 91.0 789.1 91.9 Foreign government bonds 1.5 — 20.6 1.0 22.1 1.0 Corporate bonds 195.0 25.4 1,171.3 194.9 1,366.3 220.3 Other asset-backed securities 133.4 0.8 752.5 39.1 885.9 39.9 Total $ 479.2 $ 28.3 $ 3,415.5 $ 452.2 $ 3,894.7 $ 480.5 Number of positions with a gross unrealized loss 195 2,305 2,500 Fair value as a percentage of total fixed maturity securities at fair value 9.2 % 65.2 % 74.4 %
Schedule of Distribution of the Company's Fixed Maturity Portfolio by Estimated Expected Maturity	With regards to fixed maturity securities that had gross unrealized losses more than 12 months, the number of positions by their respective credit ratings were as follows: Number of Positions March 31, 2024 December 31, 2023 Credit Rating AAA 191 226 AA 984 1,006 A 415 423 BBB 437 448 Total investment grade 2,027 2,103 BB 82 93 B 34 39 CCC or lower 8 7 Total below investment grade 124 139 Not rated 62 63 Totals: 2,213 2,305 The following table presents the distribution of the Company’s fixed maturity securities portfolio by estimated expected maturity. Estimated expected maturities differ from contractual maturities, reflecting assumptions regarding borrowers' utilization of the right to call or prepay obligations with or without call or prepayment penalties. For structured securities, estimated expected maturities consider broker-dealer survey prepayment assumptions and are verified for consistency with the interest rate and economic environments. ($ in millions) March 31, 2024 Amortized Fair Percent of Total Fair Value Estimated expected maturity: Due in 1 year or less $ 287.5 $ 283.8 5.3 % Due after 1 year through 5 years 1,480.5 1,438.2 26.9 % Due after 5 years through 10 years 1,496.8 1,425.0 26.7 % Due after 10 years through 20 years 1,475.8 1,321.7 24.7 % Due after 20 years 1,044.8 874.0 16.4 % Total $ 5,785.4 $ 5,342.7 100.0 % Average option-adjusted duration, in years 5.9
Schedule of Proceeds Received From Sales of Fixed Maturities and Equity Securities	Proceeds received from sales of fixed maturity and equity securities, each determined using the specific identification method, and gross gains and gross losses realized as a result of those sales for each period were as follows: ($ in millions) Three Months Ended 2024 2023 Fixed maturity securities Proceeds received $ 88.0 $ 62.7 Gross gains realized 1.3 0.3 Gross losses realized (1.4) (2.7) Equity securities Proceeds received $ — $ — Gross gains realized — — Gross losses realized — —
Schedule of Reconciliation of Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities and Equity Securities	The following table reconciles net unrealized investment gains (losses) on fixed maturity securities, net of tax, included in AOCI: ($ in millions) Three Months Ended 2024 2023 Net unrealized investment gains (losses) Beginning of period $ (328.3) $ (449.6) Change in net unrealized investment gains (20.5) 91.3 Reclassification of net investment losses 0.8 1.9 End of period $ (348.0) $ (356.4)
Schedule of Carrying Amounts of Equity Method Limited Partnership Interests	The carrying amounts of EMA limited partnership interests were as follows: ($ in millions) March 31, 2024 December 31, 2023 Commercial mortgage loan funds $ 646.2 $ 660.8 Real estate equity funds 103.3 109.2 Private equity funds 95.5 92.7 Infrastructure equity funds 78.0 77.2 Infrastructure debt funds 62.4 59.1 Other funds (1) 133.9 139.8 Total $ 1,119.3 $ 1,138.8 (1) Other funds consist primarily of limited partnership interests in corporate mezzanine, venture capital and private credit funds.
Schedule of Offsetting Assets and Liability	The following table presents instruments that were subject to a master netting arrangement for the Company. ($ in millions) Gross Net Amounts Gross Amounts Not Offset Gross Financial Cash Net March 31, 2024 Asset derivatives: Free-standing derivatives $ 23.1 $ — $ 23.1 $ — $ 23.6 $ (0.5) December 31, 2023 Asset derivatives: Free-standing derivatives $ 19.0 $ — $ 19.0 $ — $ 18.5 $ 0.5

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Company's Fair Value Hierarchy Measured at Recurring Basis	The following table presents the Company's fair value hierarchy for financial assets and financial liabilities measured and carried at fair value on a recurring basis. During the three months ended March 31, 2024 and 2023, there were no transfers between Level 1 and Level 2. As of March 31, 2024, Level 3 invested assets comprised 9.2% of the Company’s total investment portfolio at fair value. ($ in millions) Carrying Fair Fair Value Measurements at Level 1 Level 2 Level 3 March 31, 2024 Financial Assets Investments Fixed maturity securities U.S. Government and federally Mortgage-backed securities $ 677.7 $ 677.7 $ — $ 677.7 $ — Other, including U.S. Treasury securities 391.2 391.2 45.0 346.2 — Municipal bonds 1,207.5 1,207.5 — 1,134.3 73.2 Foreign government bonds 21.9 21.9 — 21.9 — Corporate bonds 1,829.9 1,829.9 8.6 1,475.8 345.5 Other asset-backed securities 1,214.5 1,214.5 — 1,125.8 88.7 Total fixed maturity securities 5,342.7 5,342.7 53.6 4,781.7 507.4 Equity securities 84.7 84.7 18.1 64.1 2.5 Short-term investments 69.4 69.4 69.4 — — Other investments 23.1 23.1 — 23.1 — Totals $ 5,519.9 $ 5,519.9 $ 141.1 $ 4,868.9 $ 509.9 Separate Account variable annuity assets (1) $ 3,516.9 $ 3,516.9 $ 3,516.9 $ — $ — Financial Liabilities (2) $ 85.0 $ 85.0 $ — $ 4.2 $ 80.8 December 31, 2023 Financial Assets Investments Fixed maturity securities U.S. Government and federally Mortgage-backed securities $ 653.2 $ 653.2 $ — $ 653.2 $ — Other, including U.S. Treasury securities 388.8 388.8 45.6 343.2 — Municipal bonds 1,270.1 1,270.1 — 1,196.1 74.0 Foreign government bonds 22.1 22.1 — 22.1 — Corporate bonds 1,772.7 1,772.7 10.1 1,420.1 342.5 Other asset-backed securities 1,128.4 1,128.4 — 1,030.9 97.5 Total fixed maturity securities 5,235.3 5,235.3 55.7 4,665.6 514.0 Equity securities 86.2 86.2 17.9 63.8 4.5 Short-term investments 132.9 132.9 132.9 — — Other investments 19.0 19.0 — 19.0 — Totals $ 5,473.4 $ 5,473.4 $ 206.5 $ 4,748.4 $ 518.5 Separate Account (variable annuity) assets (1) $ 3,294.1 $ 3,294.1 $ 3,294.1 $ — $ — Financial Liabilities (2) $ 86.0 $ 86.0 $ — $ 3.6 $ 82.4 (1) Separate Account variable annuity assets represent contractholder funds invested in various actively traded mutual funds that have daily quoted net asset values that are readily determinable for identical assets that the Company can access. Separate Account variable annuity liabilities are equal to the estimated fair value of the Separate Account variable annuity assets. (2) Represents embedded derivatives related to fixed indexed annuity and indexed universal life products reported in Future policy benefit reserves and Other policyholder funds as well as net MRBs reported in Policyholders' account balances in the Company's Consolidated Balance Sheets.
Schedule of Table for Reconciliations for All Level 3 Assets Measured at Fair Value on a Recurring Basis	The reconciliation for all financial assets and financial liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) were as follows: ($ in millions) Financial Assets Financial Liabilities (1) Municipal Corporate Mortgage-Backed and Other Asset- Backed Securities (2) Total Equity Total Beginning balance, January 1, 2024 $ 74.0 $ 342.5 $ 97.5 $ 514.0 $ 4.5 $ 518.5 $ 82.4 Transfers into Level 3 (3) — — — — — — — Transfers out of Level 3 (3) — (4.4) — (4.4) — (4.4) — Total gains or losses Net investment gains (losses) included in net income — — — — 0.1 0.1 — Net investment (gains) losses included in net income related to financial liabilities — — — — — — 1.3 Net unrealized gains (losses) included in OCI (0.7) (0.6) 2.4 1.1 — 1.1 (0.1) Purchases — 14.1 — 14.1 — 14.1 — Issuances — — — — — — 1.4 Sales — — — — — — — Settlements — — — — — — — Paydowns, maturities and distributions (0.1) (6.1) (11.2) (17.4) (2.1) (19.5) (4.2) Ending balance, March 31, 2024 $ 73.2 $ 345.5 $ 88.7 $ 507.4 $ 2.5 $ 509.9 $ 80.8 Beginning balance, January 1, 2023 $ 54.4 $ 261.3 $ 107.6 $ 423.3 $ 2.0 $ 425.3 $ 91.0 Transfers into Level 3 (3) — 5.9 0.4 6.3 — 6.3 — Transfers out of Level 3 (3) — — — — — — — Total gains or losses Net investment gains (losses) included in net income — — — — — — — Net investment (gains) losses included in net income related to financial liabilities — — — — — — 0.2 Net unrealized gains (losses) included in OCI 1.2 0.9 (0.4) 1.7 — 1.7 — Purchases — 19.0 0.2 19.2 — 19.2 — Issuances — — — — — — 2.1 Sales — (2.6) — (2.6) — (2.6) — Settlements — — — — — — — Paydowns, maturities and distributions (0.2) (0.5) (3.2) (3.9) — (3.9) (3.4) Ending balance, March 31, 2023 $ 55.4 $ 284.0 $ 104.6 $ 444.0 $ 2.0 $ 446.0 $ 89.9 (1) Represents embedded derivatives related to fixed indexed annuity and indexed universal life products reported in Future policy benefit reserves and Other policyholder funds as well as net MRBs reported in Policyholders' account balances in the Company's Consolidated Balance Sheets. (2) Includes U.S. Government and federally sponsored agency obligations for mortgage-backed securities and other asset-backed securities. (3) Transfers into and out of Level 3 during the three months ended March 31, 2024 and 2023 were related to changes in the primary pricing source and changes in observability of external information used in determining fair value. The Company's policy is to recognize transfers into and out of the levels as having occurred at the end of the reporting period in which the transfers were determined.
Schedule of Fair Value Measurement Inputs and Valuation Techniques	Level 3 Assets and Liabilities by Price Source The table below presents the balances of Level 3 assets and liabilities measured at fair value with their corresponding pricing sources: ($ in millions) Total Internal External March 31, 2024 Financial Assets Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ — $ — $ — Municipal bonds 73.2 — 73.2 Corporate bonds 345.5 185.5 160.0 Other asset-backed securities 88.7 — 88.7 Total fixed maturity securities 507.4 185.5 321.9 Equity securities 2.5 — 2.5 Totals $ 509.9 $ 185.5 $ 324.4 Financial Liabilities (1) $ 80.8 $ 80.8 $ — December 31, 2023 Financial Assets Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ — $ — $ — Municipal bonds 74.0 — 74.0 Corporate bonds 342.5 180.4 162.1 Other asset-backed securities 97.5 — 97.5 Total fixed maturity securities 514.0 180.4 333.6 Equity securities 4.5 — 4.5 Totals $ 518.5 $ 180.4 $ 338.1 Financial Liabilities (1) $ 82.4 $ 82.4 $ — (1) Represents embedded derivatives related to fixed indexed annuity and indexed universal life products reported in Future policy benefit reserves and Other policyholder funds as well as net MRBs reported in Policyholders' account balances in the Company's Consolidated Balance Sheets. External pricing sources for securities represent prices from prior transactions or unadjusted third-party pricing information where pricing inputs are not readily available. Quantitative Information about Level 3 Fair Value Measurements The following table provides quantitative information about the significant unobservable inputs for recurring fair value measurements categorized with Level 3. ($ in millions) Fair Value as of March 31, 2024 Valuation Technique(s) Unobservable Inputs Range (Weighted Average) and Single Point Best Estimate (1) Impact of Increase in Input on Fair Value Financial Assets Corporate bonds $ 185.5 discounted cash flow yield 4.5% - 16.2% decrease discounted cash flow option adjusted spread 116 bps - 852 bps decrease Financial Liabilities Derivatives embedded in fixed indexed annuity products $ 87.1 discounted cash flow lapse rate 5.9% decrease mortality multiplier (2) 69.4% decrease option budget 0.9% - 3.8% increase non-performance adjustment (3) 5.0% decrease Net MRBs $ (6.3) discounted cash flow lapse rate 5.9% decrease mortality multiplier (2) 69.4% increase (1) When a range of unobservable inputs is not readily available, the Company uses a single point best estimate. (2) Mortality multiplier is applied to the Annuity 2000 table. (3) Determined as a percentage of the risk-free rate. The following table summarizes the ranges of actual experience and expected experience for mortality and lapses of LFPB: March 31, 2024 Whole Life Term Life Experience Life Limited-Pay Whole Life SPIA (life contingent) Mortality Actual experience 0.7 % 0.1% - 0.2% 2.1 % — % N.M. Expected experience 0.7 % 0.1% - 0.4% 1.7 % 0.3 % N.M. Lapses Actual experience 3.4 % 3.6% - 22.0% 3.4 % 3.6 % N.M. Expected experience 4.3 % 5.1% - 6.9% 3.0 % 4.6 % N.M. March 31, 2023 Whole Life Term Life Experience Life Limited-Pay Whole Life SPIA (life contingent) Mortality Actual experience 0.7 % 0.1% - 0.3% 1.9 % — % N.M. Expected experience 0.7 % 0.1% - 0.6% 1.6 % 0.2 % N.M. Lapses Actual experience 3.6 % 5.6% - 8.3% 3.4 % 3.6 % N.M. Expected experience 4.6 % 2.8% - 5.6% 3.0 % 5.1 % N.M.
Schedule of Fair Value Assets and Liabilities Measured on Nonrecurring Basis	($ in millions) Carrying Fair Fair Value Measurements at Level 1 Level 2 Level 3 March 31, 2024 Financial Assets Other investments $ 218.7 $ 222.0 $ — $ 34.9 $ 187.1 Deposit asset on reinsurance 2,472.4 2,192.2 — — 2,192.2 Financial Liabilities Policyholders' account balances 5,052.6 4,657.8 — — 4,657.8 Reverse repurchase agreement 50.0 51.8 — 51.8 — Other policyholder funds 941.1 941.1 — 933.7 7.4 Long-term debt 546.2 569.8 — 569.8 — December 31, 2023 Financial Assets Other investments $ 218.4 $ 221.7 $ — $ 33.8 $ 187.9 Deposit asset on reinsurance 2,496.6 2,259.6 — — 2,259.6 Financial Liabilities Policyholders' account balances 4,996.3 4,861.8 — — 4,861.8 Other policyholder funds 916.0 916.0 — 908.7 7.3 Long-term debt 546.0 571.4 — 571.4 —

Short-Duration Insurance Cont_2

Short-Duration Insurance Contracts (Tables)	3 Months Ended
	Mar. 31, 2024
Insurance Loss Reserves [Abstract]
Schedule of Reconciliation of Property and Casualty Unpaid Claims and Claim Expense	The following table is a summary reconciliation of the beginning and ending Property & Casualty unpaid claims and claim expense reserves for the periods indicated. The table presents reserves on both a gross and net (after reinsurance) basis. The total net Property & Casualty insurance claims and claim expense incurred amounts are reflected in the Consolidated Statements of Operations and Comprehensive Income (Loss). The end of period gross reserves (before reinsurance balances and reinsurance recoverable balances) are reflected on a gross basis in the Consolidated Balance Sheets. ($ in millions) Three Months Ended 2024 2023 Property & Casualty Beginning gross reserves $ 416.8 $ 388.7 Less: reinsurance recoverables 104.0 100.8 Net reserves, beginning of period (1) 312.8 287.9 Incurred claims and claim expenses: Claims occurring in the current period 124.7 128.8 Increase (decrease) in estimated reserves for claims occurring in prior periods (2) — — Total claims and claim expenses incurred 124.7 128.8 Claims and claim expense payments for claims occurring during: Current period 44.6 40.6 Prior periods 78.3 79.6 Total claims and claim expense payments 122.9 120.2 Net reserves, end of period (1) 314.6 296.5 Plus: reinsurance recoverables 103.6 101.3 Ending gross reserves $ 418.2 $ 397.8 (1) Reserves net of expected reinsurance recoverables. (2) Shows the amounts by which the Company increased (decreased) its reserves in each of the periods indicated for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs - also known as prior years' reserve development. The following table is a summary reconciliation of the beginning and ending Group Benefits unpaid claims and claim expense reserves for the periods indicated. The table presents reserves on both a gross and net (after reinsurance). The total net Group Benefits insurance claims and claim expense incurred amounts are reflected in the Consolidated Statements of Operations and Comprehensive Income (Loss). The end of period gross reserves (before reinsurance balances and reinsurance recoverable balances) are reflected on a gross basis in the Consolidated Balance Sheets. ($ in millions) Three Months Ended 2024 2023 Group Benefits Beginning gross reserves $ 116.6 $ 121.6 Less: reinsurance recoverables 27.7 27.9 Net reserves, beginning of period (1) 88.9 93.7 Incurred claims and claim expenses: Claims occurring in the current period 20.2 20.2 Increase (decrease) in estimated reserves for claims occurring in prior periods (2) (6.1) (4.9) Total claims and claim expenses incurred 14.1 15.3 Claims and claim expense payments for claims occurring during: Current period 3.9 4.2 Prior periods 12.4 12.4 Total claims and claim expense payments 16.3 16.6 Net reserves, end of period (1) 86.7 92.3 Plus: reinsurance recoverables 27.6 28.0 Ending gross reserves $ 114.3 $ 120.3 (1) Reserves net of expected reinsurance recoverables. (2) Shows the amounts by which the Company increased (decreased) its reserves in each of the periods indicated for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs - also known as prior years' reserve development.
Schedule of Reconciliation of Net Incurred and Paid Claims Development To Liability for Claims and Claim Adjustment Expenses	($ in millions) As of March 31, 2024 As of December 31, 2023 Ending gross reserves Property & Casualty $ 418.2 $ 416.8 Group Benefits 114.3 116.6 Total short-duration insurance contracts 532.5 533.4 Other than short-duration (1) 51.9 48.3 Total unpaid claims and claims expenses $ 584.4 $ 581.7 (1)

Long-Duration Insurance Contr_2

Long-Duration Insurance Contracts (Tables)	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Schedule of Liability for Future Policy Benefit, Activity	The following tables summarize balances and changes in LFPB for traditional and limited-payment contracts. The balances of and changes in LFPB as of and for the three months ended March 31, 2024 were as follows: ($ in millions) Whole Life Term Life Experience Life (1) Limited-Pay Whole Life Supplemental Health (2) SPIA (life contingent) Present value of expected net premiums: Balance at January 1, 2024 $ 223.2 $ 240.0 $ 71.7 $ 32.2 $ 182.0 $ — January 1, 2024 balance at original discount rate 247.1 256.6 67.0 33.9 213.4 — Effect of: Change in cash flow assumptions — — — — — — Actual variances from expected experience 0.3 0.3 (0.1) 0.2 0.2 — Adjusted balance at January 1, 2024 247.4 256.9 66.9 34.1 213.6 — Issuances (3) 2.5 6.1 — 1.0 5.6 0.6 Interest accruals (4) 1.9 2.6 0.9 0.3 1.6 — Net premiums collected (5) (7.8) (6.2) (1.7) (1.2) (6.2) (0.6) March 31, 2024 balance at original discount rate 244.0 259.4 66.1 34.2 214.6 — Effect of changes in discount rate assumptions (28.5) (21.7) 2.9 (2.3) (35.1) — Balance at March 31, 2024 215.5 237.7 69.0 31.9 179.5 — Present value of expected future policy benefits: Balance at January 1, 2024 522.0 370.1 883.0 89.6 427.6 104.2 January 1, 2024 balance at original discount rate 592.1 405.4 797.5 105.6 517.9 111.4 Effect of: Changes in cash flow assumptions — — — — — — Actual variances from expected experience 0.5 1.0 — 0.1 0.1 0.3 Adjusted balance at January 1, 2024 592.6 406.4 797.5 105.7 518.0 111.7 Issuances 2.5 6.2 — 1.0 5.6 0.6 Interest accruals 4.8 3.9 11.8 1.0 3.6 1.1 Benefit payments (6) (7.9) (5.4) (17.6) (0.4) (16.7) (3.1) March 31, 2024 balance at original discount rate 592.0 411.1 791.7 107.3 510.5 110.3 Effect of changes in discount rate assumptions (88.2) (45.0) 57.9 (20.1) (98.9) (9.0) Balance at March 31, 2024 503.8 366.1 849.6 87.2 411.6 101.3 Net liability for future policy benefits 288.3 128.3 780.6 55.3 231.8 101.3 Less: Reinsurance recoverable (62.5) (19.0) (1.1) (1.1) (3.8) (3.5) Net liability for future policy benefits, after reinsurance recoverable 225.8 109.3 779.5 54.2 228.0 97.8 Impact of flooring on net liability for future policy benefits — — — — — — Net liability for future policy benefits at March 31, 2024 $ 225.8 $ 109.3 $ 779.5 $ 54.2 $ 228.0 $ 97.8 (1) Experience Life contains both whole life and term elements. (2) As of March 31, 2024, the net LFPB for Supplemental Health was $113.1 million for cancer, $20.7 million for accident, $26.5 million for disability and $122.6 million for other supplemental health policies. (3) Issuances are calculated at present value, using the original discount rate, of the expected net premiums or the expected future policy benefits related to new policies issued during the current period. (4) Interest accruals represent the interest earned on the beginning present value of either the expected net premiums or the expected future policy benefits using the original interest rate. (5) Net premiums collected represent the product of the current period net premium ratio and the gross premiums collected during the period of in force business. (6) Benefit payments represent the release of the present value, using the original discount rate, of the expected future policy benefits due to death, lapse/withdrawal and maturity payments based on revised expected assumptions. The balances of and changes in LFPB as of and for the year ended December 31, 2023 were as follows: ($ in millions) Whole Life Term Life Experience Life (1) Limited-Pay Whole Life Supplemental Health (2) SPIA (life contingent) Present value of expected net premiums: Balance at January 1, 2023 $ 215.1 $ 234.7 $ 68.3 $ 29.7 $ 167.4 $ — January 1, 2023 balance at original discount rate 245.9 265.4 65.5 32.4 205.1 — Effect of: Change in cash flow assumptions — (16.8) 3.7 (0.2) 6.5 — Actual variances from expected experience 3.8 (2.7) 0.7 1.0 (1.6) — Adjusted balance at January 1, 2023 249.7 245.9 69.9 33.2 210.0 — Issuances (3) 10.8 25.2 — 4.3 19.4 5.6 Interest accruals (4) 7.2 10.3 3.7 1.2 6.0 — Net premiums collected (5) (20.6) (24.8) (6.6) (4.8) (22.0) (5.6) December 31, 2023 balance at original discount rate 247.1 256.6 67.0 33.9 213.4 — Effect of changes in discount rate assumptions (23.9) (16.6) 4.7 (1.7) (31.4) — Balance at December 31, 2023 223.2 240.0 71.7 32.2 182.0 — Present value of expected future policy benefits: Balance at January 1, 2023 493.6 347.0 867.5 79.4 431.7 103.3 January 1, 2023 balance at original discount rate 581.9 401.0 805.2 98.6 537.1 113.4 Effect of: Changes in cash flow assumptions (0.6) (16.7) 5.0 (0.2) 8.9 — Actual variances from expected experience 4.0 1.3 1.1 1.0 (2.4) (0.8) Adjusted balance at January 1, 2023 585.3 385.6 811.3 99.4 543.6 112.6 Issuances 10.7 25.8 — 4.3 19.4 6.3 Interest accruals 19.0 15.2 47.4 3.9 14.4 4.4 Benefit payments (6) (22.9) (21.2) (61.2) (2.0) (59.5) (11.9) December 31, 2023 balance at original discount rate 592.1 405.4 797.5 105.6 517.9 111.4 Effect of changes in discount rate assumptions (70.1) (35.3) 85.5 (16.0) (90.3) (7.2) Balance at December 31, 2023 522.0 370.1 883.0 89.6 427.6 104.2 Net liability for future policy benefits 298.8 130.2 811.3 57.4 245.6 104.2 Less: Reinsurance recoverable (64.3) (19.1) (1.0) (1.2) (4.0) (3.6) Net liability for future policy benefits, after reinsurance recoverable 234.5 111.1 810.3 56.2 241.6 100.6 Impact of flooring on net liability for future policy benefits — — — — — — Net liability for future policy benefits at December 31, 2023 $ 234.5 $ 111.1 $ 810.3 $ 56.2 $ 241.6 $ 100.6 (1) Experience Life contains both whole life and term elements. (2) As of December 31, 2023, the net LFPB for Supplemental Health was $92.7 million for cancer, $21.4 million for accident, $23.5 million for disability and $104.0 million for other supplemental health policies. (3) Issuances are calculated at present value, using the original discount rate, of the expected net premiums or the expected future policy benefits related to new policies issued during the current period. (4) Interest accruals represent the interest earned on the beginning present value of either the expected net premiums or the expected future policy benefits using the original interest rate. (5) Net premiums collected represent the product of the current period net premium ratio and the gross premiums collected during the period of in force business. (6) Benefit payments represent the release of the present value, using the original discount rate, of the expected future policy benefits due to death, lapse/withdrawal and maturity payments based on revised expected assumptions. The following table summarizes the amount of revenue and interest related to traditional and limited-payment contracts recognized in the Consolidated Statements of Operations and Comprehensive Income (Loss): ($ in millions) Gross premiums or assessments Three Months Ended March 31, 2024 2023 Whole life $ 6.9 $ 6.6 Term life 11.2 10.8 Experience life 7.7 8.2 Limited-pay whole life 1.8 1.6 Supplemental health 30.4 29.7 SPIA (life contingent) 1.2 2.2 Total $ 59.2 $ 59.1 ($ in millions) Interest expense Three Months Ended March 31, 2024 2023 Whole life $ 3.0 $ 2.9 Term life 1.3 1.2 Experience life 10.8 11.0 Limited-pay whole life 0.7 0.6 Supplemental health 2.0 2.2 SPIA (life contingent) 1.1 1.1 Total $ 18.9 $ 19.0 The following table provides the amount of undiscounted and discounted expected gross premiums and expected future benefits and expenses for traditional and limited-payment contracts: ($ in millions) As of March 31, 2024 As of December 31, 2023 Undiscounted Discounted Undiscounted Discounted Whole life Expected future gross premiums $ 473.5 $ 323.0 $ 478.8 $ 325.0 Expected future benefits and expenses 1,151.5 592.0 1,152.8 592.1 Term life Expected future gross premiums 695.7 452.3 689.0 449.4 Expected future benefits and expenses 694.7 411.1 682.7 405.4 Experience Life Expected future gross premiums 519.4 290.6 530.0 296.1 Expected future benefits and expenses 1,684.3 791.7 1,703.1 797.5 Limited-pay whole life Expected future gross premiums 65.6 49.6 64.7 49.1 Expected future benefits and expenses 249.2 107.3 244.9 105.6 Supplemental health Expected future gross premiums 1,619.2 1,187.4 1,624.1 1,192.5 Expected future benefits and expenses 712.7 510.5 719.4 517.9 SPIA (life contingent) Expected future gross premiums — — — — Expected future benefits and expenses 155.0 110.3 156.1 111.4 The following table provides the weighted-average durations of LFPB, in years: As of March 31, 2024 2023 Whole life 17.9 18.0 Term life 16.6 17.0 Experience life 10.3 11.0 Limited-pay whole life 21.9 23.0 Supplemental health 10.8 10.2 SPIA (life contingent) 7.6 8.0 The following table provides ranges of the weighted-average interest rates for LFPB: As of March 31, 2024 2023 Whole life Interest accretion rate 1.7% - 4.9% 1.7% - 4.9% Current discount rate 4.6% - 5.4% 4.7% - 5.0% Term life Interest accretion rate 4.2% - 4.2% 4.1% - 4.3% Current discount rate 5.2% - 5.3% 4.9% - 5.0% Experience life Interest accretion rate 6.1 % 6.1 % Current discount rate 5.3 % 5.0 % Limited-pay whole life Interest accretion rate 4.0 % 3.9 % Current discount rate 5.4 % 5.0 % Supplemental health Interest accretion rate 1.7% - 2.7% 1.7% - 2.7% Current discount rate 5.3% - 5.4% 5.0% - 5.2% SPIA (life contingent) Interest accretion rate 1.7% - 4.1% 1.7% - 4.1% Current discount rate 5.2% - 5.2% 4.9% - 5.0%
Schedule of Liability for Future Policy Benefits, by Product Segment	The following table reconciles the net LFPB to LFPB in the Consolidated Balance Sheets. DPL for single premium and immediate annuity products is presented together with LFPB in the Consolidated Balance Sheets: ($ in millions) March 31, 2024 December 31, 2023 Whole life $ 288.3 $ 298.8 Term life 128.3 130.2 Experience life 780.6 811.3 Limited-pay whole life 55.3 57.4 Supplemental health 231.8 245.6 SPIA (life contingent) 101.3 104.2 Limited-pay whole life DPL 4.3 4.1 SPIA (life contingent) DPL 1.3 1.3 Reconciling items (1) 110.9 108.9 Total $ 1,702.1 $ 1,761.8 (1) Reconciling items primarily relate to products not in scope of ASU 2018-12 and return of premium reserves.
Schedule of Fair Value Measurement Inputs and Valuation Techniques	Level 3 Assets and Liabilities by Price Source The table below presents the balances of Level 3 assets and liabilities measured at fair value with their corresponding pricing sources: ($ in millions) Total Internal External March 31, 2024 Financial Assets Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ — $ — $ — Municipal bonds 73.2 — 73.2 Corporate bonds 345.5 185.5 160.0 Other asset-backed securities 88.7 — 88.7 Total fixed maturity securities 507.4 185.5 321.9 Equity securities 2.5 — 2.5 Totals $ 509.9 $ 185.5 $ 324.4 Financial Liabilities (1) $ 80.8 $ 80.8 $ — December 31, 2023 Financial Assets Fixed maturity securities U.S. Government and federally sponsored agency obligations: Mortgage-backed securities $ — $ — $ — Municipal bonds 74.0 — 74.0 Corporate bonds 342.5 180.4 162.1 Other asset-backed securities 97.5 — 97.5 Total fixed maturity securities 514.0 180.4 333.6 Equity securities 4.5 — 4.5 Totals $ 518.5 $ 180.4 $ 338.1 Financial Liabilities (1) $ 82.4 $ 82.4 $ — (1) Represents embedded derivatives related to fixed indexed annuity and indexed universal life products reported in Future policy benefit reserves and Other policyholder funds as well as net MRBs reported in Policyholders' account balances in the Company's Consolidated Balance Sheets. External pricing sources for securities represent prices from prior transactions or unadjusted third-party pricing information where pricing inputs are not readily available. Quantitative Information about Level 3 Fair Value Measurements The following table provides quantitative information about the significant unobservable inputs for recurring fair value measurements categorized with Level 3. ($ in millions) Fair Value as of March 31, 2024 Valuation Technique(s) Unobservable Inputs Range (Weighted Average) and Single Point Best Estimate (1) Impact of Increase in Input on Fair Value Financial Assets Corporate bonds $ 185.5 discounted cash flow yield 4.5% - 16.2% decrease discounted cash flow option adjusted spread 116 bps - 852 bps decrease Financial Liabilities Derivatives embedded in fixed indexed annuity products $ 87.1 discounted cash flow lapse rate 5.9% decrease mortality multiplier (2) 69.4% decrease option budget 0.9% - 3.8% increase non-performance adjustment (3) 5.0% decrease Net MRBs $ (6.3) discounted cash flow lapse rate 5.9% decrease mortality multiplier (2) 69.4% increase (1) When a range of unobservable inputs is not readily available, the Company uses a single point best estimate. (2) Mortality multiplier is applied to the Annuity 2000 table. (3) Determined as a percentage of the risk-free rate. The following table summarizes the ranges of actual experience and expected experience for mortality and lapses of LFPB: March 31, 2024 Whole Life Term Life Experience Life Limited-Pay Whole Life SPIA (life contingent) Mortality Actual experience 0.7 % 0.1% - 0.2% 2.1 % — % N.M. Expected experience 0.7 % 0.1% - 0.4% 1.7 % 0.3 % N.M. Lapses Actual experience 3.4 % 3.6% - 22.0% 3.4 % 3.6 % N.M. Expected experience 4.3 % 5.1% - 6.9% 3.0 % 4.6 % N.M. March 31, 2023 Whole Life Term Life Experience Life Limited-Pay Whole Life SPIA (life contingent) Mortality Actual experience 0.7 % 0.1% - 0.3% 1.9 % — % N.M. Expected experience 0.7 % 0.1% - 0.6% 1.6 % 0.2 % N.M. Lapses Actual experience 3.6 % 5.6% - 8.3% 3.4 % 3.6 % N.M. Expected experience 4.6 % 2.8% - 5.6% 3.0 % 5.1 % N.M.
Schedule of Policyholder Account Balance	The Company recognizes a liability for policyholders' account balances. The following tables summarize balances of and changes in policyholders' account balances: ($ in millions) Three Months Ended March 31, 2024 Indexed Universal Life Experience Life Fixed Account Annuities Fixed Indexed Account Annuities SPIA (non-life contingent) Balance at January 1, 2024 $ 57.8 $ 61.2 $ 4,556.0 $ 449.0 $ 32.6 Premiums received (1) $ 3.9 $ (0.1) $ 49.0 $ 3.6 $ 0.8 Surrenders and withdrawals (2) (0.5) (1.3) (112.2) (13.3) (0.6) Benefit payments (3) — (0.5) (20.6) (0.8) (1.4) Net transfers from (to) separate account (0.1) — 1.9 (0.8) — Interest credited (4) 0.8 0.7 41.7 2.7 0.2 Other (0.9) 0.1 4.1 (3.0) — Balance at March 31, 2024 $ 61.0 $ 60.1 $ 4,519.9 $ 437.4 $ 31.6 Weighted-average crediting rate 5.6 % 4.9 % 3.7 % 2.5 % 3.1 % Net amount at risk (5) $ — $ — $ 32.0 $ — $ — Cash surrender value $ 43.3 $ 59.5 $ 4,468.2 $ 428.4 $ 31.4 ($ in millions) Three Months Ended March 31, 2023 Indexed Universal Life Experience Life Fixed Account Annuities Fixed Indexed Account Annuities SPIA (non-life contingent) Balance at January 1, 2023 $ 47.6 $ 64.3 $ 4,591.1 $ 510.3 $ 34.4 Premiums received (1) $ 3.6 $ (0.2) $ 54.9 $ 5.1 $ 1.1 Surrenders and withdrawals (2) (0.4) (0.9) (98.1) (13.9) (0.1) Benefit payments (3) — (0.5) (19.1) (0.6) (1.7) Net transfers from (to) separate account — — 6.6 (0.9) — Interest credited (4) — 0.8 40.1 — 0.3 Other (0.9) — 1.9 (1.6) (0.2) Balance at March 31, 2023 $ 49.9 $ 63.5 $ 4,577.4 $ 498.4 $ 33.8 Weighted-average crediting rate 0.1 % 5.0 % 3.6 % — % 3.0 % Net amount at risk (5) $ — $ — $ 39.5 $ — $ — Cash surrender value $ 32.9 $ 62.8 $ 4,540.9 $ 486.7 $ 33.7 (1) Premiums received represents premiums collected from policyholder during the period of in force business. (2) Surrenders and withdrawals represent reductions to the policyholders' account balance due to policyholders surrendering the policy or withdrawing funds from the account balance. (3) Benefit payments represent benefits due under contract that were paid to a policyholder during the periods. (4) Interest credited represents interest earned and credited to policyholders' account balance during the periods. (5) Net amount at risk represents guaranteed benefit amounts less current policyholders' account balance at the reporting date. The following table reconciles policyholders' account balances to the policyholders' account balance liability in the Consolidated Balances Sheets: ($ in millions) March 31, 2024 December 31, 2023 Indexed universal life $ 61.0 $ 57.8 Experience Life 60.1 61.2 Fixed account annuities 4,519.9 4,556.0 Fixed indexed account annuities 437.4 449.0 SPIA (non-life contingent) 31.6 32.6 Reconciling items (1) 27.6 30.4 Total $ 5,137.6 $ 5,187.0 (1) Reconciling items primarily relate to FIA reserves net of account balances, miscellaneous fixed annuity reserves, personal promise accounts and MRBs.
Schedule of Policyholder Account Balance, Guaranteed Minimum Crediting Rate	The following tables present the gross account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders and the respective guaranteed minimums: ($ in millions) March 31, 2024 At Guaranteed Minimum 1-50 Basis Points Above 51-150 Basis Points Above Greater Than 150 Basis Points Above Total (1) Guaranteed minimum crediting rates: Less than 2% $ 22.4 $ 114.3 $ 506.5 $ 216.5 $ 859.7 Equal to 2% but less than 3% 132.2 101.2 77.1 107.8 418.3 Equal to 3% but less than 4% 546.4 42.2 0.7 — 589.3 Equal to 4% but less than 5% 2,644.1 — — — 2,644.1 5% or higher 85.6 — — — 85.6 Total $ 3,430.7 $ 257.7 $ 584.3 $ 324.3 $ 4,597.0 ($ in millions) December 31, 2023 At Guaranteed Minimum 1-50 Basis Points Above 51-150 Basis Points Above Greater Than 150 Basis Points Above Total (1) Guaranteed minimum crediting rates: Less than 2% $ 36.7 $ 159.8 $ 489.4 $ 200.2 $ 886.1 Equal to 2% but less than 3% 162.9 77.9 65.8 76.1 382.7 Equal to 3% but less than 4% 571.3 36.9 0.7 — 609.0 Equal to 4% but less than 5% 2,670.5 — — — 2,670.5 5% or higher 86.9 — — — 86.9 Total $ 3,528.3 $ 274.6 $ 555.9 $ 276.3 $ 4,635.2 (1) Excludes products not containing a fixed guaranteed minimum crediting rate.
Schedule of Separate Account, Liability	The following table presents the balances of and changes in the Separate Account variable annuity liabilities presented in the Consolidated Balance Sheets (1) : ($ in millions) Retirement Services Variable Account Annuities March 31, 2024 December 31, 2023 Balance, beginning of year $ 3,294.1 $ 2,792.3 Deposits 59.3 234.2 Withdrawals (69.7) (213.4) Net transfers (1.1) (15.5) Fees and charges (12.3) (37.6) Market appreciation (depreciation) 246.6 541.5 Other — (7.4) Balance, end of period $ 3,516.9 $ 3,294.1 (1) The Separate Account variable annuity liabilities are backed by, and are equal to, the Separate Account variable annuity assets that represent contractholder funds invested in various actively traded mutual funds that have daily quoted net asset values that are readily determinable for identical assets that the Company can access.
Schedule of Market Risk Benefit, Activity	The following table presents the balances of and changes in MRBs associated with deferred variable annuities as of and for the three months ended March 31, 2024 and 2023, respectively: ($ in millions) Three Months Ended 2024 2023 Balance, beginning of period $ (3.9) $ 0.2 Balance, beginning of period, before effects of changes in the instrument-specific credit risk (4.5) — Changes in market risk benefits (1) (2.3) 0.9 Balance, end of period (2) $ (6.8) $ 0.9 Effect of changes in the instrument-specific credit risk 0.5 0.4 Balance, end of period $ (6.3) $ 1.3 Net amount at risk (3) $ 16.6 $ 38.3 Weighted-average attained age of contract holders 62 63 (1) Reflects interest accruals and effect of changes in interest rates, equity markets, equity index volatility and future assumptions. (2) Balance, end of period, before the effect of changes in the instrument-specific credit risk. (3) Net amount at risk represents the current guaranteed benefit less current account balance at the reporting date. The following table presents MRBs by amounts in an asset position and amounts in a liability position. The net liabilities (assets) are included in Policyholders' account balances presented in the Consolidated Balance Sheets. ($ in millions) As of March 31, 2024 As of December 31, 2023 (Asset) Liability Net (Asset) Liability Net Deferred variable annuities $ (8.3) $ 2.0 $ (6.3) $ (6.7) $ 2.8 $ (3.9)
Schedule of Deferred Policy Acquisition Costs	Deferred Acquisition Costs The following tables roll-forward DAC for the periods indicated: ($ in millions) Three Months Ended March 31, 2024 Whole Life Term Life Experience Life Limited-Pay Whole Life Indexed Universal Life Supplemental Health Total Annuities Balance, beginning of period $ 22.3 $ 32.6 $ 5.7 $ 7.4 $ 16.8 $ 8.2 $ 214.0 Capitalizations 0.7 1.2 0.1 0.2 0.7 0.8 3.9 Amortization expense (0.3) (0.9) (0.1) (0.1) (0.3) (0.2) (3.7) Experience adjustment (0.1) — — — (0.1) (0.1) (1.3) Balance, end of period $ 22.6 $ 32.9 $ 5.7 $ 7.5 $ 17.1 $ 8.7 $ 212.9 ($ in millions) Three Months Ended March 31, 2023 Whole Life Term Life Experience Life Limited-Pay Whole Life Indexed Universal Life Supplemental Health Total Annuities Balance, beginning of period $ 20.9 $ 30.0 $ 5.8 $ 6.7 $ 15.4 $ 6.2 $ 221.1 Capitalizations 0.6 1.3 — 0.2 0.5 0.6 4.0 Amortization expense (0.3) (0.6) — (0.1) (0.2) (0.1) (3.7) Experience adjustment — — — — — — (1.7) Balance, end of period $ 21.2 $ 30.7 $ 5.8 $ 6.8 $ 15.7 $ 6.7 $ 219.7 The following table presents a reconciliation of DAC to the Consolidated Balance Sheets: ($ in millions) March 31, 2024 December 31, 2023 Whole life $ 22.6 $ 22.3 Term life 32.9 32.6 Experience life 5.7 5.7 Limited pay whole life 7.5 7.4 Indexed universal life 17.1 16.8 Supplemental health 8.7 8.2 Total annuities 212.9 214.0 Reconciling item (1) 29.9 29.3 Total $ 337.3 $ 336.3 (1) Reconciling item relates to DAC associated with the Property & Casualty reporting segment.

Reinsurance (Tables)

Reinsurance (Tables)	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Schedule of Effects of Reinsurance on Premiums and Benefits	The effects of reinsurance on net premiums written and contract deposits; net premiums and contract charges earned; and benefits, claims and settlement expenses were as follows: ($ in millions) Direct Ceded to Other Companies (1) Assumed Net Three months ended March 31, 2024 Net premiums written and contract deposits (2) $ 386.4 $ 18.1 $ 7.3 $ 375.6 Net premiums and contract charges earned 288.0 19.8 7.0 275.2 Benefits, claims and settlement expenses 186.9 14.6 4.0 176.3 Three months ended March 31, 2023 Net premiums written and contract deposits (2) $ 367.8 $ 16.6 $ 10.4 $ 361.6 Net premiums and contract charges earned 264.0 18.5 10.4 255.9 Benefits, claims and settlement expenses 192.9 12.7 3.0 183.2 (1) Excludes the annuity reinsurance transaction accounted for using the deposit method. (2) This measure is not based on accounting principles generally accepted in the United States of America (non-GAAP). An explanation of this non-GAAP measure is contained in the Glossary of Selected Terms included as Exhibit 99.1 in the Company's reports filed with the SEC.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Schedule of Summarized Financial Information for These Segments	Summarized financial information for these segments is as follows: ($ in millions) Three Months Ended 2024 2023 Net premiums and contract charges earned Property & Casualty $ 173.2 $ 152.4 Life & Retirement 37.8 37.7 Supplemental & Group Benefits 64.2 65.8 Total $ 275.2 $ 255.9 Net investment income Property & Casualty $ 12.3 $ 4.0 Life & Retirement 85.8 87.9 Supplemental & Group Benefits 7.8 9.1 Corporate & Other — — Intersegment eliminations (0.5) (0.6) Total $ 105.4 $ 100.4 Net income (loss) Property & Casualty $ 10.6 $ (11.6) Life & Retirement 11.7 14.0 Supplemental & Group Benefits 11.0 14.0 Corporate & Other (6.8) (9.8) Total $ 26.5 $ 6.6 ($ in millions) March 31, 2024 December 31, 2023 Assets Property & Casualty $ 1,229.2 $ 1,218.1 Life & Retirement 11,568.3 11,365.0 Supplemental & Group Benefits 1,319.4 1,338.8 Corporate & Other 184.7 190.4 Intersegment eliminations (65.3) (62.4) Total $ 14,236.3 $ 14,049.9

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table reconciles these components. ($ in millions) Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities (1) Net Reserve Remeasurements Attributable to Discount Rates (1) Net Funded Status of Benefit Plans (1) Total (1) Beginning balance, January 1, 2024 $ (328.3) $ 21.9 $ (7.6) $ (314.0) Other comprehensive income (loss) before reclassifications (20.5) 41.4 — 20.9 Amounts reclassified from AOCI (2) 0.8 — — 0.8 Net current period other comprehensive income (loss) (19.7) 41.4 — 21.7 Ending balance, March 31, 2024 $ (348.0) $ 63.3 $ (7.6) $ (292.3) Beginning balance, January 1, 2023 $ (449.6) $ 59.0 $ (8.8) $ (399.4) Other comprehensive income (loss) before reclassifications 91.3 (41.2) — 50.1 Amounts reclassified from AOCI (2) 1.9 — — 1.9 Net current period other comprehensive income (loss) 93.2 (41.2) — 52.0 Ending balance, March 31, 2023 $ (356.4) $ 17.8 $ (8.8) $ (347.4) (1) All amounts are net of tax. (2) The pretax amounts reclassified from AOCI, $(1.0) million and $(2.4) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.2) million and $(0.5) million, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2024 and 2023, respectively.

Supplemental Consolidated Cas_2

Supplemental Consolidated Cash and Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash and Cash Equivalents	($ in millions) March 31, 2024 December 31, 2023 Cash $ 19.8 $ 29.0 Restricted cash 0.6 0.7 Total cash and restricted cash reported in the Consolidated Balance Sheets $ 20.4 $ 29.7
Schedule of Restrictions on Cash and Cash Equivalents	($ in millions) March 31, 2024 December 31, 2023 Cash $ 19.8 $ 29.0 Restricted cash 0.6 0.7 Total cash and restricted cash reported in the Consolidated Balance Sheets $ 20.4 $ 29.7
Schedule of Supplemental Cash Flow Information	($ in millions) Three Months Ended 2024 2023 Cash paid for: Interest $ 11.0 $ 1.2 Income taxes — 0.1

Basis of Presentation and Sig_3

Basis of Presentation and Significant Accounting Policies - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments (segments)	4

Investments - Net Investment In

Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Investment Income
Total net investment income	$ 105.4	$ 100.4
Investment Portfolio
Net Investment Income
Investment expenses	(2.6)	(3.6)
Total net investment income	79.9	74.7
Deposit Asset on Reinsurance
Net Investment Income
Total net investment income	25.5	25.7
Fixed maturity securities | Investment Portfolio
Net Investment Income
Net investment income	70.4	67.7
Equity securities | Investment Portfolio
Net Investment Income
Net investment income	1.2	2.7
Limited partnership interests | Investment Portfolio
Net Investment Income
Net investment income	6.2	4.4
Short-term and other investments | Investment Portfolio
Net Investment Income
Net investment income	$ 4.7	$ 3.5

Investments - Net Investment Lo

Investments - Net Investment Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Gain (Loss) on Securities
Net investment gains (losses)	$ 2.2	$ (3.9)
Fixed maturity securities
Gain (Loss) on Securities
Net investment gains (losses)	(1)	(2.4)
Equity securities
Gain (Loss) on Securities
Net investment gains (losses)	2.6	(1)
Short-term investments and other
Gain (Loss) on Securities
Net investment gains (losses)	$ 0.6	$ (0.5)

Investments - Net Investment Ga

Investments - Net Investment Gains (Losses) by Transaction Type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Credit loss impairments	$ (0.9)	$ 0
Intent-to-sell impairments	0	0
Total impairments	(0.9)	0
Sales and other, net	(0.1)	(2.4)
Change in fair value - equity securities	2.6	(1)
Change in fair value and gains (losses) realized on settlements - derivatives	0.6	(0.5)
Net investment gains (losses)	$ 2.2	$ (3.9)

Investments- Allowance for Cred

Investments- Allowance for Credit Loss Impairments on Fixed Maturity Securities (Details) - Fixed maturity securities - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss
Beginning balance	$ 1.2	$ 1.2
Credit losses on fixed maturity securities for which credit losses were not previously reported	0.9	0
Net increase related to credit losses previously reported	0	0
Reduction of credit allowances related to sales	0	0
Write-offs	0	0
Ending balance	$ 2.1	$ 1.2

Investments - Summary of Fair V

Investments - Summary of Fair Value and Amortized Costs (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Amortized Cost, net	$ 5,785.4	$ 5,652.9
Fair Value	5,342.7	5,235.3
Fixed maturity securities
Schedule of Investments [Line Items]
Amortized Cost, net	5,785.4	5,652.9
Gross Unrealized Gains	56.7	62.9
Gross Unrealized Losses	499.4	480.5
Fair Value	5,342.7	5,235.3
Mortgage-backed securities
Schedule of Investments [Line Items]
Amortized Cost, net	746.5	713.4
Gross Unrealized Gains	2.9	4.4
Gross Unrealized Losses	71.7	64.6
Fair Value	677.7	653.2
Other, including U.S. Treasury securities
Schedule of Investments [Line Items]
Amortized Cost, net	457.6	450.8
Gross Unrealized Gains	0.4	0.8
Gross Unrealized Losses	66.8	62.8
Fair Value	391.2	388.8
Municipal bonds
Schedule of Investments [Line Items]
Amortized Cost, net	1,282.2	1,333.4
Gross Unrealized Gains	22.6	28.6
Gross Unrealized Losses	97.3	91.9
Fair Value	1,207.5	1,270.1
Foreign government bonds
Schedule of Investments [Line Items]
Amortized Cost, net	23.1	23.1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1.2	1
Fair Value	21.9	22.1
Corporate bonds
Schedule of Investments [Line Items]
Amortized Cost, net	2,041.1	1,969.9
Gross Unrealized Gains	18.5	23.1
Gross Unrealized Losses	229.7	220.3
Fair Value	1,829.9	1,772.7
Other asset-backed securities
Schedule of Investments [Line Items]
Amortized Cost, net	1,234.9	1,162.3
Gross Unrealized Gains	12.3	6
Gross Unrealized Losses	32.7	39.9
Fair Value	$ 1,214.5	$ 1,128.4

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Securities sold under agreements to repurchase	$ 50	$ 0
Reverse repurchase agreement, cash to value percentage	95%
Investment grade rating	95.90%
Fair Value	$ 5,342.7	5,235.3
FHLB funding agreements	929.5	904.5
Fair Value
Schedule of Investments [Line Items]
Securities sold under agreements to repurchase	51.8	0
FHLB of Chicago
Schedule of Investments [Line Items]
Fair Value	1,014.4	987.2
Governmental Agencies as Required by Law in Various States
Schedule of Investments [Line Items]
Fair Value	$ 27	$ 29.2

Investments - Fair Value and Gr

Investments - Fair Value and Gross Unrealized Losses (Details) $ in Millions	Mar. 31, 2024 USD ($)	Mar. 31, 2024 security	Mar. 31, 2024	Mar. 31, 2024 position	Dec. 31, 2023 USD ($)	Dec. 31, 2023 security	Dec. 31, 2023	Dec. 31, 2023 position
Fixed maturity securities, Gross Unrealized Losses
Number of positions with a gross unrealized loss, 12 Months or Less (security) | security		298				195
Number of positions with a gross unrealized loss, more than 12 months (security)		2,213		2,213		2,305		2,305
Number of positions with a gross unrealized loss, Total (security) | security		2,511				2,500
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent)			10.90%				9.20%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent)			59.10%				65.20%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent)			70%				74.40%
Fixed maturity securities
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	$ 581.8				$ 479.2
Fixed maturity securities, Fair Value, More than 12 Months	3,155.2				3,415.5
Fixed maturity securities, Fair Value, Total	3,737				3,894.7
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	28.4				28.3
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	471				452.2
Fixed maturity securities, Gross Unrealized Losses, Total	499.4				480.5
Mortgage-backed securities
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	63.1				45.3
Fixed maturity securities, Fair Value, More than 12 Months	470.4				458.5
Fixed maturity securities, Fair Value, Total	533.5				503.8
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	1				0.8
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	70.7				63.8
Fixed maturity securities, Gross Unrealized Losses, Total	71.7				64.6
Other
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	100.8				39.5
Fixed maturity securities, Fair Value, More than 12 Months	276.6				288
Fixed maturity securities, Fair Value, Total	377.4				327.5
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	1.6				0.4
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	65.2				62.4
Fixed maturity securities, Gross Unrealized Losses, Total	66.8				62.8
Municipal bonds
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	111.7				64.5
Fixed maturity securities, Fair Value, More than 12 Months	704.9				724.6
Fixed maturity securities, Fair Value, Total	816.6				789.1
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	1.6				0.9
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	95.7				91
Fixed maturity securities, Gross Unrealized Losses, Total	97.3				91.9
Foreign government bonds
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	1.4				1.5
Fixed maturity securities, Fair Value, More than 12 Months	20.5				20.6
Fixed maturity securities, Fair Value, Total	21.9				22.1
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	0.1				0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	1.1				1
Fixed maturity securities, Gross Unrealized Losses, Total	1.2				1
Corporate bonds
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	252.8				195
Fixed maturity securities, Fair Value, More than 12 Months	1,147.4				1,171.3
Fixed maturity securities, Fair Value, Total	1,400.2				1,366.3
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	23.5				25.4
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	206.2				194.9
Fixed maturity securities, Gross Unrealized Losses, Total	229.7				220.3
Other asset-backed securities
Fixed maturity securities, Fair Value
Fixed maturity securities, Fair Value, 12 Months or Less	52				133.4
Fixed maturity securities, Fair Value, More than 12 Months	535.4				752.5
Fixed maturity securities, Fair Value, Total	587.4				885.9
Fixed maturity securities, Gross Unrealized Losses
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less	0.6				0.8
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months	32.1				39.1
Fixed maturity securities, Gross Unrealized Losses, Total	$ 32.7				$ 39.9

Investments - Fixed Maturity Se

Investments - Fixed Maturity Securities in Continuous Loss Position (Details)	Mar. 31, 2024 security	Mar. 31, 2024 position	Dec. 31, 2023 security	Dec. 31, 2023 position
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months	2,213	2,213	2,305	2,305
Investment Grade
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		2,027		2,103
Non Investment Grade
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		124		139
AAA
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		191		226
AA
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		984		1,006
A
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		415		423
BBB
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		437		448
BB
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		82		93
B
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		34		39
CCC or lower
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		8		7
Not rated
Gain (Loss) on Securities
Number of position with a gross unrealized loss, more than 12 months		62		63

Investments - Distribution of F

Investments - Distribution of Fixed Maturity Securities by Expected Maturity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost, net
Due in 1 year or less	$ 287.5
Due after 1 year through 5 years	1,480.5
Due after 5 years through 10 years	1,496.8
Due after 10 years through 20 years	1,475.8
Due after 20 years	1,044.8
Amortized Cost, net	5,785.4	$ 5,652.9
Fair Value
Due in 1 year or less	283.8
Due after 1 year through 5 years	1,438.2
Due after 5 years through 10 years	1,425
Due after 10 years through 20 years	1,321.7
Due after 20 years	874
Total	$ 5,342.7	$ 5,235.3
Percent of Total Fair Value
Due in 1 year Or less (percent)	5.30%
Due after 1 year through 5 years (percent)	26.90%
Due after 5 years through 10 years (percent)	26.70%
Due after 10 years through 20 years (percent)	24.70%
Due after 20 years (percent)	16.40%
Total (percent)	100%
Average option-adjusted duration, in years	5 years 10 months 24 days

Investments - Sales of Fixed Ma

Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fixed maturity securities
Proceeds received	$ 88	$ 62.7
Gross gains realized	1.3	0.3
Gross losses realized	(1.4)	(2.7)
Equity securities
Proceeds received	0	0
Gross gains realized	0	0
Gross losses realized	$ 0	$ 0

Investments - Reconciliation of

Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	$ 1,175.3
Ending balance	1,211.4	$ 1,139.2
Net unrealized investment gains (losses) on securities
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	(328.3)	(449.6)
Ending balance	(348)	(356.4)
Net unrealized investment gains (losses) on securities | Fixed maturity securities
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	(328.3)	(449.6)
Change in net unrealized investment gains (losses) on fixed maturity securities	(20.5)	91.3
Reclassification of net investment losses on fixed maturity securities to net income	0.8	1.9
Ending balance	$ (348)	$ (356.4)

Investments - Carrying Amount o

Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments
Limited partnership interests	$ 1,119.3	$ 1,138.8
Commercial mortgage loan funds
Schedule of Equity Method Investments
Limited partnership interests	646.2	660.8
Real estate equity funds
Schedule of Equity Method Investments
Limited partnership interests	103.3	109.2
Private equity funds
Schedule of Equity Method Investments
Limited partnership interests	95.5	92.7
Infrastructure equity funds
Schedule of Equity Method Investments
Limited partnership interests	78	77.2
Infrastructure debt funds
Schedule of Equity Method Investments
Limited partnership interests	62.4	59.1
Other funds
Schedule of Equity Method Investments
Limited partnership interests	$ 133.9	$ 139.8

Investments - Offsetting of Ass

Investments - Offsetting of Assets and Liabilities (Details) - Free-standing derivatives - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Asset derivatives:
Gross Amounts	$ 23.1	$ 19
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheets	23.1	19
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	23.6	18.5
Net Amount	$ (0.5)
Net Amount		$ 0.5

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Percentage of level 3 invested assets in total investment portfolio	9.20%
Net investment gains (losses) included in net income related to financial liabilities	$ 1.3	$ 0.2

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financial Assets
Total fixed maturity securities	$ 5,342.7	$ 5,235.3
Equity securities	84.7	86.2
Mortgage-backed securities
Financial Assets
Total fixed maturity securities	677.7	653.2
Other, including U.S. Treasury securities
Financial Assets
Total fixed maturity securities	391.2	388.8
Municipal bonds
Financial Assets
Total fixed maturity securities	1,207.5	1,270.1
Foreign government bonds
Financial Assets
Total fixed maturity securities	21.9	22.1
Corporate bonds
Financial Assets
Total fixed maturity securities	1,829.9	1,772.7
Other asset-backed securities
Financial Assets
Total fixed maturity securities	1,214.5	1,128.4
Carrying Amount | Recurring
Financial Assets
Total fixed maturity securities	5,342.7	5,235.3
Equity securities	84.7	86.2
Short-term investments	69.4	132.9
Other investments	23.1	19
Totals	5,519.9	5,473.4
Separate Account variable annuity assets	3,516.9	3,294.1
Financial Liabilities	85	86
Carrying Amount | Recurring | Mortgage-backed securities
Financial Assets
Total fixed maturity securities	677.7	653.2
Carrying Amount | Recurring | Other, including U.S. Treasury securities
Financial Assets
Total fixed maturity securities	391.2	388.8
Carrying Amount | Recurring | Municipal bonds
Financial Assets
Total fixed maturity securities	1,207.5	1,270.1
Carrying Amount | Recurring | Foreign government bonds
Financial Assets
Total fixed maturity securities	21.9	22.1
Carrying Amount | Recurring | Corporate bonds
Financial Assets
Total fixed maturity securities	1,829.9	1,772.7
Carrying Amount | Recurring | Other asset-backed securities
Financial Assets
Total fixed maturity securities	1,214.5	1,128.4
Fair Value | Recurring
Financial Assets
Total fixed maturity securities	5,342.7	5,235.3
Equity securities	84.7	86.2
Short-term investments	69.4	132.9
Other investments	23.1	19
Totals	5,519.9	5,473.4
Separate Account variable annuity assets	3,516.9	3,294.1
Financial Liabilities	85	86
Fair Value | Recurring | Level 1
Financial Assets
Total fixed maturity securities	53.6	55.7
Equity securities	18.1	17.9
Short-term investments	69.4	132.9
Other investments	0	0
Totals	141.1	206.5
Separate Account variable annuity assets	3,516.9	3,294.1
Financial Liabilities	0	0
Fair Value | Recurring | Level 2
Financial Assets
Total fixed maturity securities	4,781.7	4,665.6
Equity securities	64.1	63.8
Short-term investments	0	0
Other investments	23.1	19
Totals	4,868.9	4,748.4
Separate Account variable annuity assets	0	0
Financial Liabilities	4.2	3.6
Fair Value | Recurring | Level 3
Financial Assets
Total fixed maturity securities	507.4	514
Equity securities	2.5	4.5
Short-term investments	0	0
Other investments	0	0
Totals	509.9	518.5
Separate Account variable annuity assets	0	0
Financial Liabilities	80.8	82.4
Fair Value | Recurring | Mortgage-backed securities
Financial Assets
Total fixed maturity securities	677.7	653.2
Fair Value | Recurring | Mortgage-backed securities | Level 1
Financial Assets
Total fixed maturity securities	0	0
Fair Value | Recurring | Mortgage-backed securities | Level 2
Financial Assets
Total fixed maturity securities	677.7	653.2
Fair Value | Recurring | Mortgage-backed securities | Level 3
Financial Assets
Total fixed maturity securities	0	0
Fair Value | Recurring | Other, including U.S. Treasury securities
Financial Assets
Total fixed maturity securities	391.2	388.8
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 1
Financial Assets
Total fixed maturity securities	45	45.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 2
Financial Assets
Total fixed maturity securities	346.2	343.2
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 3
Financial Assets
Total fixed maturity securities	0	0
Fair Value | Recurring | Municipal bonds
Financial Assets
Total fixed maturity securities	1,207.5	1,270.1
Fair Value | Recurring | Municipal bonds | Level 1
Financial Assets
Total fixed maturity securities	0	0
Fair Value | Recurring | Municipal bonds | Level 2
Financial Assets
Total fixed maturity securities	1,134.3	1,196.1
Fair Value | Recurring | Municipal bonds | Level 3
Financial Assets
Total fixed maturity securities	73.2	74
Fair Value | Recurring | Foreign government bonds
Financial Assets
Total fixed maturity securities	21.9	22.1
Fair Value | Recurring | Foreign government bonds | Level 1
Financial Assets
Total fixed maturity securities	0	0
Fair Value | Recurring | Foreign government bonds | Level 2
Financial Assets
Total fixed maturity securities	21.9	22.1
Fair Value | Recurring | Foreign government bonds | Level 3
Financial Assets
Total fixed maturity securities	0	0
Fair Value | Recurring | Corporate bonds
Financial Assets
Total fixed maturity securities	1,829.9	1,772.7
Fair Value | Recurring | Corporate bonds | Level 1
Financial Assets
Total fixed maturity securities	8.6	10.1
Fair Value | Recurring | Corporate bonds | Level 2
Financial Assets
Total fixed maturity securities	1,475.8	1,420.1
Fair Value | Recurring | Corporate bonds | Level 3
Financial Assets
Total fixed maturity securities	345.5	342.5
Fair Value | Recurring | Other asset-backed securities
Financial Assets
Total fixed maturity securities	1,214.5	1,128.4
Fair Value | Recurring | Other asset-backed securities | Level 1
Financial Assets
Total fixed maturity securities	0	0
Fair Value | Recurring | Other asset-backed securities | Level 2
Financial Assets
Total fixed maturity securities	1,125.8	1,030.9
Fair Value | Recurring | Other asset-backed securities | Level 3
Financial Assets
Total fixed maturity securities	$ 88.7	$ 97.5

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Rollforward of Instruments Measured on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financial Assets
Beginning balance	$ 518.5	$ 425.3
Transfers into Level 3	0	6.3
Transfers out of Level 3	(4.4)	0
Total gains or losses
Net investment gains (losses) included in net income	0.1	0
Net unrealized gains (losses) included in OCI	1.1	1.7
Purchases	14.1	19.2
Issuances	0	0
Sales	0	(2.6)
Settlements	0	0
Paydowns, maturities and distributions	(19.5)	(3.9)
Ending balance	509.9	446
Financial Liabilities
Beginning balance	82.4	91
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Total gains or losses
Net investment (gains) losses included in net income related to financial liabilities	(1.3)	(0.2)
Net unrealized gains (losses) included in OCI	(0.1)	0
Purchases	0	0
Issuances	1.4	2.1
Sales	0	0
Settlements	0	0
Paydowns, maturities and distributions	(4.2)	(3.4)
Ending balance	$ 80.8	$ 89.9
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net investment gains (losses)	Net investment gains (losses)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent
Municipal bonds
Financial Assets
Beginning balance	$ 74	$ 54.4
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Total gains or losses
Net investment gains (losses) included in net income	0	0
Net unrealized gains (losses) included in OCI	(0.7)	1.2
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Paydowns, maturities and distributions	(0.1)	(0.2)
Ending balance	73.2	55.4
Corporate bonds
Financial Assets
Beginning balance	342.5	261.3
Transfers into Level 3	0	5.9
Transfers out of Level 3	(4.4)	0
Total gains or losses
Net investment gains (losses) included in net income	0	0
Net unrealized gains (losses) included in OCI	(0.6)	0.9
Purchases	14.1	19
Issuances	0	0
Sales	0	(2.6)
Settlements	0	0
Paydowns, maturities and distributions	(6.1)	(0.5)
Ending balance	345.5	284
Mortgage Backed and Other Asset- Backed Securities
Financial Assets
Beginning balance	97.5	107.6
Transfers into Level 3	0	0.4
Transfers out of Level 3	0	0
Total gains or losses
Net investment gains (losses) included in net income	0	0
Net unrealized gains (losses) included in OCI	2.4	(0.4)
Purchases	0	0.2
Issuances	0	0
Sales	0	0
Settlements	0	0
Paydowns, maturities and distributions	(11.2)	(3.2)
Ending balance	88.7	104.6
Total Fixed Maturity Securities
Financial Assets
Beginning balance	514	423.3
Transfers into Level 3	0	6.3
Transfers out of Level 3	(4.4)	0
Total gains or losses
Net investment gains (losses) included in net income	0	0
Net unrealized gains (losses) included in OCI	1.1	1.7
Purchases	14.1	19.2
Issuances	0	0
Sales	0	(2.6)
Settlements	0	0
Paydowns, maturities and distributions	(17.4)	(3.9)
Ending balance	507.4	444
Equity securities
Financial Assets
Beginning balance	4.5	2
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Total gains or losses
Net investment gains (losses) included in net income	0.1	0
Net unrealized gains (losses) included in OCI	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Paydowns, maturities and distributions	(2.1)	0
Ending balance	$ 2.5	$ 2

Fair Value of Financial Instr_6

Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	$ 5,342.7	$ 5,235.3
Equity securities at fair value, (cost $101700000 and $86200000)	84.7	86.2
Net MRBs	(6.3)	(3.9)	$ 1.3	$ 0.2
Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	5,342.7	5,235.3
Equity securities at fair value, (cost $101700000 and $86200000)	84.7	86.2
Financial Liabilities	85	86
Mortgage-backed securities
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	677.7	653.2
Mortgage-backed securities | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	677.7	653.2
Municipal bonds
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,207.5	1,270.1
Municipal bonds | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,207.5	1,270.1
Corporate bonds
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,829.9	1,772.7
Corporate bonds | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,829.9	1,772.7
Other asset-backed securities
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,214.5	1,128.4
Other asset-backed securities | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,214.5	1,128.4
Level 3 | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	507.4	514
Equity securities at fair value, (cost $101700000 and $86200000)	2.5	4.5
Totals	509.9	518.5
Financial Liabilities	80.8	82.4
Derivatives embedded in fixed indexed annuity products	87.1
Net MRBs	(6.3)
Level 3 | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	185.5	180.4
Equity securities at fair value, (cost $101700000 and $86200000)	0	0
Totals	185.5	180.4
Financial Liabilities	80.8	82.4
Level 3 | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	321.9	333.6
Equity securities at fair value, (cost $101700000 and $86200000)	2.5	4.5
Totals	324.4	338.1
Financial Liabilities	0	0
Level 3 | Mortgage-backed securities | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0	0
Level 3 | Mortgage-backed securities | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0	0
Level 3 | Mortgage-backed securities | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0	0
Level 3 | Municipal bonds | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	73.2	74
Level 3 | Municipal bonds | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0	0
Level 3 | Municipal bonds | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	73.2	74
Level 3 | Corporate bonds | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	345.5	342.5
Level 3 | Corporate bonds | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	185.5	180.4
Level 3 | Corporate bonds | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	160	162.1
Level 3 | Other asset-backed securities | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	88.7	97.5
Level 3 | Other asset-backed securities | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0	0
Level 3 | Other asset-backed securities | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	$ 88.7	$ 97.5
Minimum | Level 3 | discounted cash flow | option budget
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.009
Minimum | Level 3 | Corporate bonds | discounted cash flow | yield
Fair Value Measurement Inputs and Valuation Techniques
Debt securities, measurement input	0.045
Minimum | Level 3 | Corporate bonds | discounted cash flow | option adjusted spread
Fair Value Measurement Inputs and Valuation Techniques
Debt securities, measurement input	0.0116
Maximum | Level 3 | discounted cash flow | option budget
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.038
Maximum | Level 3 | Corporate bonds | discounted cash flow | yield
Fair Value Measurement Inputs and Valuation Techniques
Debt securities, measurement input	0.162
Maximum | Level 3 | Corporate bonds | discounted cash flow | option adjusted spread
Fair Value Measurement Inputs and Valuation Techniques
Debt securities, measurement input	0.0852
Weighted Average | Level 3 | discounted cash flow | lapse rate
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.059
Net MRBs, measurement input	0.059
Weighted Average | Level 3 | discounted cash flow | mortality multiplier
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.694
Net MRBs, measurement input	0.694
Weighted Average | Level 3 | discounted cash flow | non-performance adjustment
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.050

Fair Value of Financial Instr_7

Fair Value of Financial Instruments - Financial Instrument Not Carried at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Level 1
Investments
Other investments	$ 0	$ 0
Deposit asset on reinsurance	0	0
Financial Liabilities
Policyholders' account balances	0	0
Reverse repurchase agreement	0
Other policyholder funds	0	0
Long-term debt	0	0
Level 2
Investments
Other investments	34.9	33.8
Deposit asset on reinsurance	0	0
Financial Liabilities
Policyholders' account balances	0	0
Reverse repurchase agreement	51.8
Other policyholder funds	933.7	908.7
Long-term debt	569.8	571.4
Level 3
Investments
Other investments	187.1	187.9
Deposit asset on reinsurance	2,192.2	2,259.6
Financial Liabilities
Policyholders' account balances	4,657.8	4,861.8
Reverse repurchase agreement	0
Other policyholder funds	7.4	7.3
Long-term debt	0	0
Carrying Amount
Investments
Other investments	218.7	218.4
Deposit asset on reinsurance	2,472.4	2,496.6
Financial Liabilities
Policyholders' account balances	5,052.6	4,996.3
Reverse repurchase agreement	50
Other policyholder funds	941.1	916
Long-term debt	546.2	546
Fair Value
Investments
Other investments	222	221.7
Deposit asset on reinsurance	2,192.2	2,259.6
Financial Liabilities
Policyholders' account balances	4,657.8	4,861.8
Reverse repurchase agreement	51.8
Other policyholder funds	941.1	916
Long-term debt	$ 569.8	$ 571.4

Short-Duration Insurance Cont_3

Short-Duration Insurance Contracts - Summary of Reinsurance Reserve Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves, beginning of year	$ 581.7
Claims and claim expense payments for claims occurring during:
Gross reserves, end of year	584.4
Group Benefits
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves, beginning of year	116.6	$ 121.6
Less: reinsurance recoverables	27.7	27.9
Net reserves, beginning of year	88.9	93.7
Incurred claims and claim expenses:
Claims occurring in the current year	20.2	20.2
Decrease in estimated reserves for claims occurring in prior years	(6.1)	(4.9)
Total claims and claim expenses incurred	14.1	15.3
Claims and claim expense payments for claims occurring during:
Current year	3.9	4.2
Prior years	12.4	12.4
Total claims and claim expense payments	16.3	16.6
Net reserves, end of year	86.7	92.3
Plus: reinsurance recoverables	27.6	28
Gross reserves, end of year	114.3	120.3
Property & Casualty
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves, beginning of year	416.8	388.7
Less: reinsurance recoverables	104	100.8
Net reserves, beginning of year	312.8	287.9
Incurred claims and claim expenses:
Claims occurring in the current year	124.7	128.8
Decrease in estimated reserves for claims occurring in prior years	0	0
Total claims and claim expenses incurred	124.7	128.8
Claims and claim expense payments for claims occurring during:
Current year	44.6	40.6
Prior years	78.3	79.6
Total claims and claim expense payments	122.9	120.2
Net reserves, end of year	314.6	296.5
Plus: reinsurance recoverables	103.6	101.3
Gross reserves, end of year	$ 418.2	$ 397.8

Short- Duration Insurance Contr

Short- Duration Insurance Contracts - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Property & Casualty
Net Amount at Risk by Product and Guarantee [Line Items]
Favorable (unfavorable) development of total reserves for claims occurring in prior years	$ 0	$ 0
Group Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Favorable (unfavorable) development of total reserves for claims occurring in prior years	$ 6,100,000	$ 4,900,000

Short-Duration Insurance Cont_4

Short-Duration Insurance Contracts - Reconciliation of Net Incurred and Paid Claims (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items]
Unpaid claims and claim expenses	$ 584.4	$ 581.7
Total short-duration insurance contracts
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items]
Unpaid claims and claim expenses	532.5	533.4
Property & Casualty
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items]
Unpaid claims and claim expenses	418.2	416.8
Group Benefits
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items]
Unpaid claims and claim expenses	114.3	116.6	$ 120.3	$ 121.6
Other than short-duration
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items]
Unpaid claims and claim expenses	$ 51.9	$ 48.3

Long-Duration Insurance Contr_3

Long-Duration Insurance Contracts - Balances of and Changes in the LFPB (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, before Reinsurance	$ 1,702.1		$ 1,761.8
Whole Life Insurance
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	223.2
Beginning period (including reserves)				$ 215.1
Beginning balance at original discount rate	247.1
Beginning balance at original discount rate (including reserves)		$ 245.9
Change in cash flow assumptions			0	0
Actual variances from expected experience			0.3	3.8
Adjusted balance			247.4	249.7
Issuances	2.5	10.8
Interest accruals	1.9	7.2
Net premiums collected	(7.8)	(20.6)
Ending balance at original discount rate	244
Effect of changes in discount rate assumptions	(28.5)		(23.9)
Ending balance	215.5
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	522
Beginning balance (including reserves)		493.6
Beginning balance at original discount rate	592		592.1
Beginning balance at original discount rate (including reserves)		581.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			0	(0.6)
Actual variances from expected experience			0.5	4
Adjusted balance			592.6	585.3
Issuances	2.5	10.7
Interest accruals	4.8	19
Benefit payments	(7.9)	(22.9)
Ending balance at original discount rate	592
Effect of changes in discount rate assumptions	(88.2)		(70.1)
Ending balance	503.8
Liability for Future Policy Benefit, before Reinsurance	288.3		298.8
Less: Reinsurance recoverable	(62.5)		(64.3)
Net liability for future policy benefits, after reinsurance recoverable	225.8		234.5
Impact of flooring on net liability for future policy benefits	0		0
Net liability for future policy benefits at March 31, 2024	225.8		234.5
Term Life Insurance
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	240
Beginning period (including reserves)				234.7
Beginning balance at original discount rate	256.6
Beginning balance at original discount rate (including reserves)		265.4
Change in cash flow assumptions			0	(16.8)
Actual variances from expected experience			0.3	(2.7)
Adjusted balance			256.9	245.9
Issuances	6.1	25.2
Interest accruals	2.6	10.3
Net premiums collected	(6.2)	(24.8)
Ending balance at original discount rate	259.4
Effect of changes in discount rate assumptions	(21.7)		(16.6)
Ending balance	237.7
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	370.1
Beginning balance (including reserves)		347
Beginning balance at original discount rate	411.1		405.4
Beginning balance at original discount rate (including reserves)		401
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			0	(16.7)
Actual variances from expected experience			1	1.3
Adjusted balance			406.4	385.6
Issuances	6.2	25.8
Interest accruals	3.9	15.2
Benefit payments	(5.4)	(21.2)
Ending balance at original discount rate	411.1
Effect of changes in discount rate assumptions	(45)		(35.3)
Ending balance	366.1
Liability for Future Policy Benefit, before Reinsurance	128.3		130.2
Less: Reinsurance recoverable	(19)		(19.1)
Net liability for future policy benefits, after reinsurance recoverable	109.3		111.1
Impact of flooring on net liability for future policy benefits	0		0
Net liability for future policy benefits at March 31, 2024	109.3		111.1
Experience Life Insurance
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	71.7
Beginning period (including reserves)				68.3
Beginning balance at original discount rate	67
Beginning balance at original discount rate (including reserves)		65.5
Change in cash flow assumptions			0	3.7
Actual variances from expected experience			(0.1)	0.7
Adjusted balance			66.9	69.9
Issuances	0	0
Interest accruals	0.9	3.7
Net premiums collected	(1.7)	(6.6)
Ending balance at original discount rate	66.1
Effect of changes in discount rate assumptions	2.9		4.7
Ending balance	69
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	883
Beginning balance (including reserves)		867.5
Beginning balance at original discount rate	791.7		797.5
Beginning balance at original discount rate (including reserves)		805.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			0	5
Actual variances from expected experience			0	1.1
Adjusted balance			797.5	811.3
Issuances	0	0
Interest accruals	11.8	47.4
Benefit payments	(17.6)	(61.2)
Ending balance at original discount rate	791.7
Effect of changes in discount rate assumptions	57.9		85.5
Ending balance	849.6
Liability for Future Policy Benefit, before Reinsurance	780.6		811.3
Less: Reinsurance recoverable	(1.1)		(1)
Net liability for future policy benefits, after reinsurance recoverable	779.5		810.3
Impact of flooring on net liability for future policy benefits	0		0
Net liability for future policy benefits at March 31, 2024	779.5		810.3
Limited Pay Whole Life Insurance
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	32.2
Beginning period (including reserves)				29.7
Beginning balance at original discount rate	33.9
Beginning balance at original discount rate (including reserves)		32.4
Change in cash flow assumptions			0	(0.2)
Actual variances from expected experience			0.2	1
Adjusted balance			34.1	33.2
Issuances	1	4.3
Interest accruals	0.3	1.2
Net premiums collected	(1.2)	(4.8)
Ending balance at original discount rate	34.2
Effect of changes in discount rate assumptions	(2.3)		(1.7)
Ending balance	31.9
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	89.6
Beginning balance (including reserves)		79.4
Beginning balance at original discount rate	107.3		105.6
Beginning balance at original discount rate (including reserves)		98.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			0	(0.2)
Actual variances from expected experience			0.1	1
Adjusted balance			105.7	99.4
Issuances	1	4.3
Interest accruals	1	3.9
Benefit payments	(0.4)	(2)
Ending balance at original discount rate	107.3
Effect of changes in discount rate assumptions	(20.1)		(16)
Ending balance	87.2
Liability for Future Policy Benefit, before Reinsurance	55.3		57.4
Less: Reinsurance recoverable	(1.1)		(1.2)
Net liability for future policy benefits, after reinsurance recoverable	54.2		56.2
Impact of flooring on net liability for future policy benefits	0		0
Net liability for future policy benefits at March 31, 2024	54.2		56.2
Supplemental health
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	182
Beginning period (including reserves)				167.4
Beginning balance at original discount rate	213.4
Beginning balance at original discount rate (including reserves)		205.1
Change in cash flow assumptions			0	6.5
Actual variances from expected experience			0.2	(1.6)
Adjusted balance			213.6	210
Issuances	5.6	19.4
Interest accruals	1.6	6
Net premiums collected	(6.2)	(22)
Ending balance at original discount rate	214.6
Effect of changes in discount rate assumptions	(35.1)		(31.4)
Ending balance	179.5
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	427.6
Beginning balance (including reserves)		431.7
Beginning balance at original discount rate	510.5		517.9
Beginning balance at original discount rate (including reserves)		537.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			0	8.9
Actual variances from expected experience			0.1	(2.4)
Adjusted balance			518	543.6
Issuances	5.6	19.4
Interest accruals	3.6	14.4
Benefit payments	(16.7)	(59.5)
Ending balance at original discount rate	510.5
Effect of changes in discount rate assumptions	(98.9)		(90.3)
Ending balance	411.6
Liability for Future Policy Benefit, before Reinsurance	231.8		245.6
Less: Reinsurance recoverable	(3.8)		(4)
Net liability for future policy benefits, after reinsurance recoverable	228		241.6
Impact of flooring on net liability for future policy benefits	0		0
Net liability for future policy benefits at March 31, 2024	228		241.6
Cancer
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits at March 31, 2024	113.1		92.7
Accident
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits at March 31, 2024	20.7		21.4
Disability
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits at March 31, 2024	26.5		23.5
Other
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits at March 31, 2024	122.6		104
Life Contingent SPIA Retirement Insurance
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	0
Beginning period (including reserves)				0
Beginning balance at original discount rate	0
Beginning balance at original discount rate (including reserves)		0
Change in cash flow assumptions			0	0
Actual variances from expected experience			0	0
Adjusted balance			0	0
Issuances	0.6	5.6
Interest accruals	0	0
Net premiums collected	(0.6)	(5.6)
Ending balance at original discount rate	0
Effect of changes in discount rate assumptions	0		0
Ending balance	0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	104.2
Beginning balance (including reserves)		103.3
Beginning balance at original discount rate	110.3		111.4
Beginning balance at original discount rate (including reserves)		113.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			0	0
Actual variances from expected experience			0.3	(0.8)
Adjusted balance			111.7	$ 112.6
Issuances	0.6	6.3
Interest accruals	1.1	4.4
Benefit payments	(3.1)	$ (11.9)
Ending balance at original discount rate	110.3
Effect of changes in discount rate assumptions	(9)		(7.2)
Ending balance	101.3
Liability for Future Policy Benefit, before Reinsurance	101.3		104.2
Less: Reinsurance recoverable	(3.5)		(3.6)
Net liability for future policy benefits, after reinsurance recoverable	97.8		100.6
Impact of flooring on net liability for future policy benefits	0		0
Net liability for future policy benefits at March 31, 2024	$ 97.8		$ 100.6

Long-Duration Insurance Contr_4

Long-Duration Insurance Contracts - Reconciliation of LFPB to Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	$ 1,702.1	$ 1,761.8
Whole life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	288.3	298.8
Term life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	128.3	130.2
Experience Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	780.6	811.3
Limited Pay Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	55.3	57.4
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	231.8	245.6
Life Contingent SPIA Retirement Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	101.3	104.2
Limited-pay whole life DPL
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	4.3	4.1
SPIA (life contingent) DPL
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	1.3	1.3
Reconciling items
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	$ 110.9	$ 108.9

Long-Duration Insurance Contr_5

Long-Duration Insurance Contracts - Amounts Recognized in the Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items]
Gross premiums or assessments	$ 59.2	$ 59.1
Interest expense	18.9	19
Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Gross premiums or assessments	6.9	6.6
Interest expense	3	2.9
Term Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Gross premiums or assessments	11.2	10.8
Interest expense	1.3	1.2
Experience Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Gross premiums or assessments	7.7	8.2
Interest expense	10.8	11
Limited Pay Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Gross premiums or assessments	1.8	1.6
Interest expense	0.7	0.6
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Gross premiums or assessments	30.4	29.7
Interest expense	2	2.2
Life Contingent SPIA Retirement Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Gross premiums or assessments	1.2	2.2
Interest expense	$ 1.1	$ 1.1

Long-Duration Insurance Contr_6

Long-Duration Insurance Contracts - Undiscounted and Discounted Expected Gross Premiums and Expected Future Benefits and Expenses (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Expected future gross premiums, undiscounted	$ 473.5	$ 478.8
Expected future benefits and expenses, undiscounted	1,151.5	1,152.8
Expected future gross premiums, discounted	323	325
Expected future benefits and expenses, discounted	592	592.1
Term Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Expected future gross premiums, undiscounted	695.7	689
Expected future benefits and expenses, undiscounted	694.7	682.7
Expected future gross premiums, discounted	452.3	449.4
Expected future benefits and expenses, discounted	411.1	405.4
Experience Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Expected future gross premiums, undiscounted	519.4	530
Expected future benefits and expenses, undiscounted	1,684.3	1,703.1
Expected future gross premiums, discounted	290.6	296.1
Expected future benefits and expenses, discounted	791.7	797.5
Limited Pay Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Expected future gross premiums, undiscounted	65.6	64.7
Expected future benefits and expenses, undiscounted	249.2	244.9
Expected future gross premiums, discounted	49.6	49.1
Expected future benefits and expenses, discounted	107.3	105.6
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Expected future gross premiums, undiscounted	1,619.2	1,624.1
Expected future benefits and expenses, undiscounted	712.7	719.4
Expected future gross premiums, discounted	1,187.4	1,192.5
Expected future benefits and expenses, discounted	510.5	517.9
Life Contingent SPIA Retirement Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Expected future gross premiums, undiscounted	0	0
Expected future benefits and expenses, undiscounted	155	156.1
Expected future gross premiums, discounted	0	0
Expected future benefits and expenses, discounted	$ 110.3	$ 111.4

Long-Duration Insurance Contr_7

Long-Duration Insurance Contracts - Actual and Expected Experience of Mortality Rate and Lapse Rate (Details)	Mar. 31, 2024	Mar. 31, 2023
Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.70%	0.70%
Mortality, expected experience	0.70%	0.70%
Lapse rate, actual experience	3.40%	3.60%
Lapse rate, expected experience	4.30%	4.60%
Term Life Insurance | Minimum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.10%	0.10%
Mortality, expected experience	0.10%	0.10%
Lapse rate, actual experience	3.60%	5.60%
Lapse rate, expected experience	5.10%	2.80%
Term Life Insurance | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.20%	0.30%
Mortality, expected experience	0.40%	0.60%
Lapse rate, actual experience	22%	8.30%
Lapse rate, expected experience	6.90%	5.60%
Experience Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	2.10%	1.90%
Mortality, expected experience	1.70%	1.60%
Lapse rate, actual experience	3.40%	3.40%
Lapse rate, expected experience	3%	3%
Limited Pay Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0%	0%
Mortality, expected experience	0.30%	0.20%
Lapse rate, actual experience	3.60%	3.60%
Lapse rate, expected experience	4.60%	5.10%

Long-Duration Insurance Contr_8

Long-Duration Insurance Contracts - Weighted-Average Durations of LFPB (Details)	Mar. 31, 2024	Mar. 31, 2023
Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	17 years 10 months 24 days	18 years
Term Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	16 years 7 months 6 days	17 years
Experience Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years 3 months 18 days	11 years
Limited Pay Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	21 years 10 months 24 days	23 years
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years 9 months 18 days	10 years 2 months 12 days
Life Contingent SPIA Retirement Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	7 years 7 months 6 days	8 years

Long-Duration Insurance Contr_9

Long-Duration Insurance Contracts - Discount Rates for LFPB (Details)	Mar. 31, 2024	Mar. 31, 2023
Whole Life Insurance | Minimum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	1.70%	1.70%
Current discount rate	4.60%	4.70%
Whole Life Insurance | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	4.90%	4.90%
Current discount rate	5.40%	5%
Term Life Insurance | Minimum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	4.20%	4.10%
Current discount rate	5.20%	4.90%
Term Life Insurance | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	4.20%	4.30%
Current discount rate	5.30%	5%
Experience Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	6.10%	6.10%
Current discount rate	5.30%	5%
Limited Pay Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	4%	3.90%
Current discount rate	5.40%	5%
Supplemental health | Minimum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	1.70%	1.70%
Current discount rate	5.30%	5%
Supplemental health | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	2.70%	2.70%
Current discount rate	5.40%	5.20%
Life Contingent SPIA Retirement Insurance | Minimum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	1.70%	1.70%
Current discount rate	5.20%	4.90%
Life Contingent SPIA Retirement Insurance | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest accretion rate	4.10%	4.10%
Current discount rate	5.20%	5%

Long-Duration Insurance Cont_10

Long-Duration Insurance Contracts - Policyholder Account Balances (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Policyholder Account Balance [Roll Forward]
Beginning balance	$ 5,187
Interest credited	52.9	$ 48.7
Ending balance	5,137.6		$ 5,187
Indexed Universal Life Insurance
Policyholder Account Balance [Roll Forward]
Beginning balance	57.8	47.6	47.6
Premiums received	3.9	3.6
Surrenders and withdrawals	(0.5)	(0.4)
Benefit payments	0	0
Net transfers from (to) separate account	(0.1)	0
Interest credited	0.8	0
Other	(0.9)	(0.9)
Ending balance	$ 61	$ 49.9	57.8
Weighted average credit rate	5.60%	0.10%
Net amount at risk	$ 0	$ 0
Cash surrender value	43.3	32.9
Experience Life Insurance
Policyholder Account Balance [Roll Forward]
Beginning balance	61.2	64.3	64.3
Premiums received	(0.1)	(0.2)
Surrenders and withdrawals	(1.3)	(0.9)
Benefit payments	(0.5)	(0.5)
Net transfers from (to) separate account	0	0
Interest credited	0.7	0.8
Other	0.1	0
Ending balance	$ 60.1	$ 63.5	61.2
Weighted average credit rate	4.90%	5%
Net amount at risk	$ 0	$ 0
Cash surrender value	59.5	62.8
Fixed Annuity
Policyholder Account Balance [Roll Forward]
Beginning balance	4,556	4,591.1	4,591.1
Premiums received	49	54.9
Surrenders and withdrawals	(112.2)	(98.1)
Benefit payments	(20.6)	(19.1)
Net transfers from (to) separate account	1.9	6.6
Interest credited	41.7	40.1
Other	4.1	1.9
Ending balance	$ 4,519.9	$ 4,577.4	4,556
Weighted average credit rate	3.70%	3.60%
Net amount at risk	$ 32	$ 39.5
Cash surrender value	4,468.2	4,540.9
Indexed Annuity
Policyholder Account Balance [Roll Forward]
Beginning balance	449	510.3	510.3
Premiums received	3.6	5.1
Surrenders and withdrawals	(13.3)	(13.9)
Benefit payments	(0.8)	(0.6)
Net transfers from (to) separate account	(0.8)	(0.9)
Interest credited	2.7	0
Other	(3)	(1.6)
Ending balance	$ 437.4	$ 498.4	449
Weighted average credit rate	2.50%	0%
Net amount at risk	$ 0	$ 0
Cash surrender value	428.4	486.7
Non-Life Contingent Single-Premium Immediate Annuity Insurance
Policyholder Account Balance [Roll Forward]
Beginning balance	32.6	34.4	34.4
Premiums received	0.8	1.1
Surrenders and withdrawals	(0.6)	(0.1)
Benefit payments	(1.4)	(1.7)
Net transfers from (to) separate account	0	0
Interest credited	0.2	0.3
Other	0	(0.2)
Ending balance	$ 31.6	$ 33.8	$ 32.6
Weighted average credit rate	3.10%	3%
Net amount at risk	$ 0	$ 0
Cash surrender value	$ 31.4	$ 33.7

Long-Duration Insurance Cont_11

Long-Duration Insurance Contracts - Reconciliation of Policyholder Account Balances to the Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 5,137.6	$ 5,187
Indexed Universal Life Insurance
Policyholder Account Balance [Line Items]
Policyholders' account balances	61	57.8	$ 49.9	$ 47.6
Experience Life Insurance
Policyholder Account Balance [Line Items]
Policyholders' account balances	60.1	61.2	63.5	64.3
Fixed Annuity
Policyholder Account Balance [Line Items]
Policyholders' account balances	4,519.9	4,556	4,577.4	4,591.1
Indexed Annuity
Policyholder Account Balance [Line Items]
Policyholders' account balances	437.4	449	498.4	510.3
Non-Life Contingent Single-Premium Immediate Annuity Insurance
Policyholder Account Balance [Line Items]
Policyholders' account balances	31.6	32.6	$ 33.8	$ 34.4
Reconciling items
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 27.6	$ 30.4

Long-Duration Insurance Cont_12

Long-Duration Insurance Contracts - Account Balances by Guaranteed Minimum Interest Rates (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 5,137.6	$ 5,187
Less than 2%
Policyholder Account Balance [Line Items]
Policyholders' account balances	859.7	886.1
Equal to 2% but less than 3%
Policyholder Account Balance [Line Items]
Policyholders' account balances	418.3	382.7
Equal to 3% but less than 4%
Policyholder Account Balance [Line Items]
Policyholders' account balances	589.3	609
Equal to 4% but less than 5%
Policyholder Account Balance [Line Items]
Policyholders' account balances	2,644.1	2,670.5
5% or higher
Policyholder Account Balance [Line Items]
Policyholders' account balances	85.6	86.9
Policyholder account balance with a guaranteed minimum crediting rate
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 4,597	$ 4,635.2
Minimum | Equal to 2% but less than 3%
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2%	2%
Minimum | Equal to 3% but less than 4%
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	3%	3%
Minimum | Equal to 4% but less than 5%
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	4%	4%
Minimum | 5% or higher
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	5%	5%
Maximum | Less than 2%
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	2%	2%
Maximum | Equal to 2% but less than 3%
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	3%	3%
Maximum | Equal to 3% but less than 4%
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	4%	4%
Maximum | Equal to 4% but less than 5%
Policyholder Account Balance [Line Items]
Policyholder account balance, guaranteed minimum credit rating	5%	5%
At Guaranteed Minimum | Less than 2%
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 22.4	$ 36.7
At Guaranteed Minimum | Equal to 2% but less than 3%
Policyholder Account Balance [Line Items]
Policyholders' account balances	132.2	162.9
At Guaranteed Minimum | Equal to 3% but less than 4%
Policyholder Account Balance [Line Items]
Policyholders' account balances	546.4	571.3
At Guaranteed Minimum | Equal to 4% but less than 5%
Policyholder Account Balance [Line Items]
Policyholders' account balances	2,644.1	2,670.5
At Guaranteed Minimum | 5% or higher
Policyholder Account Balance [Line Items]
Policyholders' account balances	85.6	86.9
At Guaranteed Minimum | Policyholder account balance with a guaranteed minimum crediting rate
Policyholder Account Balance [Line Items]
Policyholders' account balances	3,430.7	3,528.3
1-50 Basis Points Above | Less than 2%
Policyholder Account Balance [Line Items]
Policyholders' account balances	114.3	159.8
1-50 Basis Points Above | Equal to 2% but less than 3%
Policyholder Account Balance [Line Items]
Policyholders' account balances	101.2	77.9
1-50 Basis Points Above | Equal to 3% but less than 4%
Policyholder Account Balance [Line Items]
Policyholders' account balances	42.2	36.9
1-50 Basis Points Above | Equal to 4% but less than 5%
Policyholder Account Balance [Line Items]
Policyholders' account balances	0	0
1-50 Basis Points Above | 5% or higher
Policyholder Account Balance [Line Items]
Policyholders' account balances	0	0
1-50 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 257.7	$ 274.6
1-50 Basis Points Above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0001	0.0001
1-50 Basis Points Above | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0050	0.0050
51-150 Basis Points Above | Less than 2%
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 506.5	$ 489.4
51-150 Basis Points Above | Equal to 2% but less than 3%
Policyholder Account Balance [Line Items]
Policyholders' account balances	77.1	65.8
51-150 Basis Points Above | Equal to 3% but less than 4%
Policyholder Account Balance [Line Items]
Policyholders' account balances	0.7	0.7
51-150 Basis Points Above | Equal to 4% but less than 5%
Policyholder Account Balance [Line Items]
Policyholders' account balances	0	0
51-150 Basis Points Above | 5% or higher
Policyholder Account Balance [Line Items]
Policyholders' account balances	0	0
51-150 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 584.3	$ 555.9
51-150 Basis Points Above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0051	0.0051
51-150 Basis Points Above | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150
Greater Than 150 Basis Points Above | Less than 2%
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 216.5	$ 200.2
Greater Than 150 Basis Points Above | Equal to 2% but less than 3%
Policyholder Account Balance [Line Items]
Policyholders' account balances	107.8	76.1
Greater Than 150 Basis Points Above | Equal to 3% but less than 4%
Policyholder Account Balance [Line Items]
Policyholders' account balances	0	0
Greater Than 150 Basis Points Above | Equal to 4% but less than 5%
Policyholder Account Balance [Line Items]
Policyholders' account balances	0	0
Greater Than 150 Basis Points Above | 5% or higher
Policyholder Account Balance [Line Items]
Policyholders' account balances	0	0
Greater Than 150 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate
Policyholder Account Balance [Line Items]
Policyholders' account balances	$ 324.3	$ 276.3
Greater Than 150 Basis Points Above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150

Long-Duration Insurance Cont_13

Long-Duration Insurance Contracts - Separate Account Liability Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Separate Account, Liability [Roll Forward]
Balance, beginning of year	$ 3,294.1
Balance, end of period	3,516.9	$ 3,294.1
Variable Account Annuities
Separate Account, Liability [Roll Forward]
Balance, beginning of year	3,294.1	2,792.3
Deposits	59.3	234.2
Withdrawals	(69.7)	(213.4)
Net transfers	(1.1)	(15.5)
Fees and charges	(12.3)	(37.6)
Market appreciation (depreciation)	246.6	541.5
Other	0	(7.4)
Balance, end of period	$ 3,516.9	$ 3,294.1

Long-Duration Insurance Cont_14

Long-Duration Insurance Contracts - Market Risk Benefits Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Market Risk Benefit [Roll Forward]
Balance, beginning of period	$ (3.9)	$ 0.2
Balance, beginning of period, before effects of changes in the instrument-specific credit risk	(4.5)	0
Changes in market risk benefits	(2.3)	0.9
Balance, end of period	(6.8)	0.9
Effect of changes in the instrument-specific credit risk	0.5	0.4
Balance, end of period	(6.3)	1.3
Net amount at risk	$ 16.6	$ 38.3
Weighted-average attained age of contract holders	62 years	63 years

Long-Duration Insurance Cont_15

Long-Duration Insurance Contracts - Market Risk Benefits by Asset and Liability Balance (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Market Risk Benefit [Line Items]
Net	$ (6.3)	$ (3.9)	$ 1.3	$ 0.2
Deferred variable annuities
Market Risk Benefit [Line Items]
(Asset)	(8.3)	(6.7)
Liability	2	2.8
Net	$ (6.3)	$ (3.9)

Long-Duration Insurance Cont_16

Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	$ 336.3
Amortization expense	(27)	$ (23.7)
Balance, end of period	337.3
Whole Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	22.3	20.9
Capitalizations	0.7	0.6
Amortization expense	(0.3)	(0.3)
Experience adjustment	(0.1)	0
Balance, end of period	22.6	21.2
Term Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	32.6	30
Capitalizations	1.2	1.3
Amortization expense	(0.9)	(0.6)
Experience adjustment	0	0
Balance, end of period	32.9	30.7
Experience Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	5.7	5.8
Capitalizations	0.1	0
Amortization expense	(0.1)	0
Experience adjustment	0	0
Balance, end of period	5.7	5.8
Limited Pay Whole Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	7.4	6.7
Capitalizations	0.2	0.2
Amortization expense	(0.1)	(0.1)
Experience adjustment	0	0
Balance, end of period	7.5	6.8
Indexed Universal Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	16.8	15.4
Capitalizations	0.7	0.5
Amortization expense	(0.3)	(0.2)
Experience adjustment	(0.1)	0
Balance, end of period	17.1	15.7
Supplemental health
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	8.2	6.2
Capitalizations	0.8	0.6
Amortization expense	(0.2)	(0.1)
Experience adjustment	(0.1)	0
Balance, end of period	8.7	6.7
Total Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of period	214	221.1
Capitalizations	3.9	4
Amortization expense	(3.7)	(3.7)
Experience adjustment	(1.3)	(1.7)
Balance, end of period	$ 212.9	$ 219.7

Long-Duration Insurance Cont_17

Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Reconciliation to Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	$ 337.3	$ 336.3
Whole Life Insurance
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	22.6	22.3	$ 21.2	$ 20.9
Term Life Insurance
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	32.9	32.6	30.7	30
Experience Life Insurance
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	5.7	5.7	5.8	5.8
Limited Pay Whole Life Insurance
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	7.5	7.4	6.8	6.7
Indexed Universal Life Insurance
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	17.1	16.8	15.7	15.4
Supplemental health
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	8.7	8.2	6.7	6.2
Total Annuities
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	212.9	214	$ 219.7	$ 221.1
Reconciling items
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	$ 29.9	$ 29.3

Reinsurance - Summary of Reinsu

Reinsurance - Summary of Reinsurance Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Direct Amount
Net premiums written and contract deposits, Direct Amount	$ 386.4	$ 367.8
Net premiums and contract charges earned, Direct Amount	288	264
Benefits, claims and settlement expenses, Direct Amount	186.9	192.9
Ceded to Other Companies
Net premiums written and contract deposits, Ceded to Other Companies	18.1	16.6
Net premiums and contract charges earned, Ceded to Other Companies	19.8	18.5
Benefits, claims and settlement expenses, Ceded to Other Companies	14.6	12.7
Assumed from Other Companies
Net premiums written and contract deposits, Assumed from Other Companies	7.3	10.4
Net premiums and contract charges earned, Assumed from Other Companies	7	10.4
Benefits, claims and settlement expenses, Assumed from Other Companies	4	3
Net Amount
Net premiums written and contract deposits, Net Amount	375.6	361.6
Net premiums and contract charges earned, Net Amount	275.2	255.9
Benefits, claims and settlement expenses, Net Amount	$ 176.3	$ 183.2

Segment Information - Narrative

Segment Information - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 segment
Segment Reporting [Abstract]
Number of reportable segments (segments)	4
Number of operating segments (segments)	3

Segment Information - Summary o

Segment Information - Summary of Segment Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information
Net premiums and contract charges earned	$ 275.2	$ 255.9
Net investment income	105.4	100.4
Net income (loss)	26.5	6.6
Assets	14,236.3		$ 14,049.9
Intersegment eliminations
Segment Reporting Information
Net investment income	(0.5)	(0.6)
Assets	(65.3)		(62.4)
Property & Casualty | Operating segments
Segment Reporting Information
Net premiums and contract charges earned	173.2	152.4
Net investment income	12.3	4
Net income (loss)	10.6	(11.6)
Assets	1,229.2		1,218.1
Life & Retirement | Operating segments
Segment Reporting Information
Net premiums and contract charges earned	37.8	37.7
Net investment income	85.8	87.9
Net income (loss)	11.7	14
Assets	11,568.3		11,365
Supplemental & Group Benefits | Operating segments
Segment Reporting Information
Net premiums and contract charges earned	64.2	65.8
Net investment income	7.8	9.1
Net income (loss)	11	14
Assets	1,319.4		1,338.8
Corporate & Other
Segment Reporting Information
Net investment income	0	0
Net income (loss)	(6.8)	$ (9.8)
Assets	$ 184.7		$ 190.4

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	$ 1,175.3
Other comprehensive income (loss) before reclassifications	20.9	$ 50.1
Amounts reclassified from AOCI	0.8	1.9
Other comprehensive income	21.7	52
Ending balance	1,211.4	1,139.2
Pretax reclassification amounts from AOCI, tax	(0.2)	(0.5)
Total
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	(314)	(399.4)
Ending balance	(292.3)	(347.4)
Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	(328.3)	(449.6)
Other comprehensive income (loss) before reclassifications	(20.5)	91.3
Amounts reclassified from AOCI	0.8	1.9
Other comprehensive income	(19.7)	93.2
Ending balance	(348)	(356.4)
Pretax reclassification amounts from accumulated other comprehensive income (loss)	(1)	(2.4)
Net Reserve Remeasurements Attributable to Discount Rates
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	21.9	59
Other comprehensive income (loss) before reclassifications	41.4	(41.2)
Amounts reclassified from AOCI	0	0
Other comprehensive income	41.4	(41.2)
Ending balance	63.3	17.8
Net Funded Status of Benefit Plans
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	(7.6)	(8.8)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	0	0
Other comprehensive income	0	0
Ending balance	$ (7.6)	$ (8.8)

Supplemental Consolidated Cas_3

Supplemental Consolidated Cash and Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Cash	$ 19.8		$ 29
Restricted cash	0.6		0.7
Total cash and restricted cash reported in the Consolidated Balance Sheets	20.4	$ 27.4	$ 29.7	$ 42.8
Interest	11	1.2
Income taxes	$ 0	$ 0.1

Contingencies and Commitments (

Contingencies and Commitments (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) lawsuit
Commitments and Contingencies Disclosure [Abstract]
Number of lawsuits | lawsuit		1
Unfunded commitments to purchase investments | $	$ 524.6	$ 502.6