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Liability for Future Policyholder Benefits - Changes in Premiums, Discounts and Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items]                
Liability for Future Policy Benefit, Weighted-Average Duration 14 years 1 month 6 days   14 years 1 month 6 days     15 years    
Accounting Standards Update 2018-12                
Liability for Future Policy Benefit, by Product Segment [Line Items]                
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change $ 692.6 $ 711.7 $ 692.6 $ 711.7        
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance 733.2 745.1 733.2 745.1        
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 700.4 716.6 700.4 716.6 $ 723.5   $ 731.5  
Present Value of Expected Future Policyholder benefits 3,380.1 3,635.9 3,380.1 3,635.9        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 3,874.5 3,915.1 3,874.5 3,915.1        
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 3,840.1 3,893.0 3,840.1 3,893.0 3,864.4   3,903.4  
Liability for Future Policy Benefit, after Reinsurance 2,688.1 2,924.2 2,688.1 2,924.2        
Term Life Insurance                
Liability for Future Policy Benefit, by Product Segment [Line Items]                
Net Liability for Future Policyholder Benefits, post-flooring 10,260.5 10,170.1 10,260.5 10,170.1        
Term Life Insurance | Accounting Standards Update 2018-12                
Liability for Future Policy Benefit, by Product Segment [Line Items]                
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change         690.1 $ 675.4 722.4 $ 688.6
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance         723.1 694.7 744.5 728.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change 0.0 0.0 0.0 0.0        
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience 5.7 (12.3) 5.7 (12.3) 0.4   (13.0)  
Liability for Future Policy Benefit, Expected Net Premium, Issuance 25.3 30.1 63.5 61.9        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 7.9 7.5 15.5 14.5        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (23.5) (24.0) (46.2) (47.9)        
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (40.6) (33.4) (40.6) (33.4)        
Present Value of Expected Future Policyholder benefits         3,488.2 3,613.2 3,699.5 3,561.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance         3,865.7 $ 3,835.9 3,916.9 $ 3,906.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change 0.0 0.0 0.0 0.0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience 4.2 (13.2) 4.2 (13.2) $ (1.3)   $ (13.5)  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 25.2 30.1 63.4 61.9        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 42.6 42.8 85.2 85.2        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (57.7) (61.2) (114.2) (125.0)        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (494.4) (279.2) (494.4) (279.2)        
Net Liability for Future Policyholder Benefits, post-flooring 2,687.5 2,924.2 2,687.5 2,924.2        
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense 0.6 0.0 0.6 0.0        
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments 2,688.1 2,924.2 2,688.1 2,924.2        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance $ 0.0 $ 0.0 $ 0.0 $ 0.0