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Liability for Future Policyholder Benefits - Changes in Premiums, Discounts and Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance, Beginning of Year $ 675.4 $ 688.6  
Beginning Balance at Original Discount Rate 694.7 728.9  
Adjusted Beginning of Period Balance 638.4 654.7 $ 661.9
Ending Balance at Original Discount Rate 681.0 694.7 728.9
Balance, End of Year 646.1 675.4 688.6
Balance, Beginning of Year 3,613.2 3,561.0  
Beginning Balance at Original Discount Rate 3,835.9 3,906.2  
Adjusted Beginning of Period Balance 3,760.4 3,801.7 3,858.3
Ending Balance at Original Discount Rate 3,812.1 3,835.9 3,906.2
Balance, End of Year 3,295.9 3,613.2 3,561.0
Net Liability for Future Policyholder Benefits, After Reinsurance Recoverable 2,649.8 2,937.8 2,872.4
Term Life Insurance      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Expected Future Benefit Payments, undiscounted 10,100.0 10,185.2  
Term Life Insurance | Effect of Retrospective Application of Accounting Standards Update 2018-12      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance, Beginning of Year 675.4 688.6 669.0
Beginning Balance at Original Discount Rate 694.7 728.9 599.8
Effect of Changes in Cash Flow Assumptions (56.6) (35.7) 68.5
Effect of Actual Variances from Expected Experience 0.3 (38.5) (6.4)
Issuances 105.4 105.2 133.2
Interest Accrual 31.0 29.7 21.9
Net Premiums Collected (93.8) (94.9) (88.1)
Ending Balance at Original Discount Rate   694.7 728.9
Effect of Changes in Discount Rate Assumptions (34.9) (19.3) (40.3)
Balance, End of Year   675.4 688.6
Balance, Beginning of Year 3,613.2 3,561.0 4,933.1
Beginning Balance at Original Discount Rate 3,835.9 3,906.2 3,788.1
Effect of Changes in Cash Flow Assumptions (68.5) (59.0) 77.2
Effect of Actual Variances From Expected Experience (7.0) (45.5) (7.0)
Issuances 105.5 104.6 133.2
Interest Accrual 170.5 171.0 164.0
Benefit Payments (224.3) (241.4) (249.3)
Ending Balance at Original Discount Rate   3,835.9 3,906.2
Effect of Changes in Discount Rate Assumptions (516.2) (222.7) (345.2)
Balance, End of Year   3,613.2 3,561.0
Expected Future Benefit Payments, undiscounted 2,649.8 2,937.8 2,872.4
Cumulative impact of flooring the future Policyholder Benefits Reserve 0.0 0.0 0.0
Net Liability for Future Policyholder Benefits, post-flooring 2,649.8 2,937.8 2,872.4
Less: Reinsurance Recoverable $ 0.0 $ 0.0 $ 0.0