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Long-Duration Insurance Contracts - Undiscounted and Discounted Expected Gross Premiums and Expected Future Benefits and Expenses (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Whole Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Expected future gross premiums, undiscounted $ 473.9 $ 469.0
Expected future benefits and expenses, undiscounted 1,138.5 1,121.4
Expected future gross premiums, discounted 323.6 322.5
Expected future benefits and expenses, discounted 591.2 580.4
Term Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Expected future gross premiums, undiscounted 757.0 739.3
Expected future benefits and expenses, undiscounted 704.2 678.0
Expected future gross premiums, discounted 471.7 464.2
Expected future benefits and expenses, discounted 411.4 401.0
Experience Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Expected future gross premiums, undiscounted 542.1 569.6
Expected future benefits and expenses, undiscounted 1,713.6 1,755.4
Expected future gross premiums, discounted 301.8 315.5
Expected future benefits and expenses, discounted 796.4 805.2
Limited Pay Whole Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Expected future gross premiums, undiscounted 63.3 60.8
Expected future benefits and expenses, undiscounted 238.3 226.8
Expected future gross premiums, discounted 48.2 46.5
Expected future benefits and expenses, discounted 104.3 98.6
Supplemental health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Expected future gross premiums, undiscounted 1,639.2 1,615.5
Expected future benefits and expenses, undiscounted 713.5 761.4
Expected future gross premiums, discounted 1,206.3 1,208.1
Expected future benefits and expenses, discounted 517.2 563.6
SPIA (life contingent)    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Expected future gross premiums, undiscounted 0.0 0.0
Expected future benefits and expenses, undiscounted 156.7 157.7
Expected future gross premiums, discounted 0.0 0.0
Expected future benefits and expenses, discounted $ 111.9 $ 113.4