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Long-Duration Insurance Contracts - Amounts Recognized in the Statement of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Gross premiums or assessments $ 59.4 $ 59.2
Interest expense 18.8 18.9
Whole Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Gross premiums or assessments 7.0 6.9
Interest expense 3.1 3.0
Term Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Gross premiums or assessments 11.7 11.2
Interest expense 1.4 1.3
Experience life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Gross premiums or assessments 7.4 7.7
Interest expense 10.6 10.8
Limited-Pay Whole Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Gross premiums or assessments 1.8 1.8
Interest expense 0.8 0.7
Supplemental health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Gross premiums or assessments 30.9 30.4
Interest expense 1.8 2.0
SPIA (life contingent)    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Gross premiums or assessments 0.6 1.2
Interest expense $ 1.1 $ 1.1