v3.25.4
Liability for Future Policyholder Benefits - Changes in Premiums, Discounts and Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance, Beginning of Year $ 646.1 $ 675.4  
Beginning Balance at Original Discount Rate 681.0 694.7  
Adjusted Beginning of Period Balance 670.1 638.4 $ 654.7
Ending Balance at Original Discount Rate 686.6 681.0 694.7
Balance, End of Year 672.6 646.1 675.4
Balance, Beginning of Year 3,295.9 3,613.2  
Beginning Balance at Original Discount Rate 3,812.1 3,835.9  
Adjusted Beginning of Period Balance 3,786.9 3,760.4 3,801.7
Ending Balance at Original Discount Rate 3,806.6 3,812.1 3,835.9
Balance, End of Year 3,348.5 3,295.9 3,613.2
Net Liability for Future Policyholder Benefits, After Reinsurance Recoverable 2,675.9 2,649.8 2,937.8
Term Life Insurance      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Expected Future Benefit Payments, undiscounted 9,981.3 10,100.0  
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 646.1 675.4 688.6
Beginning Balance at Original Discount Rate 681.0 694.7 728.9
Effect of Changes in Cash Flow Assumptions (28.5) (56.6) (35.7)
Effect of Actual Variances from Expected Experience 17.6 0.3 (38.5)
Issuances 83.1 105.4 105.2
Interest Accrual 29.6 31.0 29.7
Net Premiums Collected (96.2) (93.8) (94.9)
Ending Balance at Original Discount Rate   681.0 694.7
Effect of Changes in Discount Rate Assumptions (14.0) (34.9) (19.3)
Balance, End of Year   646.1 675.4
Balance, Beginning of Year 3,295.9 3,613.2 3,561.0
Beginning Balance at Original Discount Rate 3,812.1 3,835.9 3,906.2
Effect of Changes in Cash Flow Assumptions (37.8) (68.5) (59.0)
Effect of Actual Variances From Expected Experience 12.6 (7.0) (45.5)
Issuances 83.1 105.5 104.6
Interest Accrual 167.9 170.5 171.0
Benefit Payments (231.3) (224.3) (241.4)
Ending Balance at Original Discount Rate   3,812.1 3,835.9
Effect of Changes in Discount Rate Assumptions (458.1) (516.2) (222.7)
Balance, End of Year   3,295.9 3,613.2
Expected Future Benefit Payments, undiscounted 2,675.9 2,649.8 2,937.8
Cumulative impact of flooring the future Policyholder Benefits Reserve 0.0 0.0 0.0
Net Liability for Future Policyholder Benefits, post-flooring 2,675.9 2,649.8 2,937.8
Less: Reinsurance Recoverable $ 0.0 $ 0.0 $ 0.0