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Liability for Future Policyholder Benefits - Changes in Premiums, Discounts and Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Liability for Future Policy Benefit, by Product Segment [Line Items]            
Weighted-Average Liability Duration of the Liability for Future Policyholder Benefits (Years) 14 years 14 years 9 months 18 days 14 years 14 years 9 months 18 days    
Effect of Retrospective Application of Accounting Standards Update 2018-12            
Liability for Future Policy Benefit, by Product Segment [Line Items]            
Adjusted Beginning of Period Balance $ 698.8 $ 699.0 $ 698.8 $ 699.0 $ 706.7 $ 731.8
Ending Balance at Original Discount Rate 711.3 745.2 711.3 745.2    
Balance, End of Period 696.9 733.2 696.9 733.2    
Adjusted Beginning of Period Balance 3,828.1 3,837.5 3,828.1 3,837.5 3,833.6 3,871.9
Ending Balance at Original Discount Rate 3,842.0 3,886.8 3,842.0 3,886.8    
Balance, End of Period 3,427.7 3,630.7 3,427.7 3,630.7    
Net Liability for Future Policyholder Benefits, After Reinsurance Recoverable 2,730.8 2,897.5 2,730.8 2,897.5    
Term Life Insurance            
Liability for Future Policy Benefit, by Product Segment [Line Items]            
Net Liability for Future Policyholder Benefits, post-flooring 10,167.1 10,274.0 10,167.1 10,274.0    
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 Period 683.1 692.6 646.1 675.4    
Beginning Balance at Original Discount Rate 705.6 733.2 681.0 694.7    
Effect of Changes in Cash Flow Assumptions 0.0 0.0 0.0 0.0    
Effect of Actual Variances from Expected Experience 17.8 4.3 17.8 4.3 1.1 (1.4)
Issuances 21.2 29.4 61.9 92.9    
Interest Accrual 7.6 8.0 22.4 23.5    
Net Premiums Collected (24.2) (24.0) (71.8) (70.2)    
Effect of Changes in Discount Rate Assumptions (14.4) (12.0) (14.4) (12.0)    
Balance, Beginning of Period 3,343.4 3,380.1 3,295.9 3,613.2    
Beginning Balance at Original Discount Rate 3,834.3 3,874.5 3,812.1 3,835.9    
Effect of Changes in Cash Flow Assumptions 0.0 0.0 0.0 0.0    
Effect of Actual Variances From Expected Experience 16.0 1.6 16.0 1.6 $ (0.7) $ (2.6)
Issuances 21.3 29.5 62.4 92.9    
Interest Accrual 42.1 43.0 126.1 128.2    
Benefit Payments (55.0) (57.6) (174.6) (171.8)    
Effect of Changes in Discount Rate Assumptions (414.3) (256.1) (414.3) (256.1)    
Net Liability for Future Policyholder Benefits, post-flooring 2,730.8 2,897.5 2,730.8 2,897.5    
Cumulative impact of flooring the future Policyholder Benefits Reserve 0.0 0.0 0.0 0.0    
Net Liability for Future Policyholder Benefits, post-flooring 2,730.8 2,897.5 2,730.8 2,897.5    
Less: Reinsurance Recoverable $ 0.0 $ 0.0 $ 0.0 $ 0.0