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Long-Duration Insurance Contracts - Reconciliation of LFPB to Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits $ 1,636.8 $ 1,622.8
Whole life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits 286.0 275.2
Term life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits 142.1 131.8
Experience life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits 752.3 746.6
Limited-Pay Whole Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits 55.7 52.1
Supplemental health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits 194.5 203.5
SPIA (life contingent)    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits 97.5 97.3
Limited-pay whole life DPL    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits 5.9 5.2
SPIA (life contingent) DPL    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits 1.5 1.5
Reconciling items    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net liability for future policy benefits $ 101.3 $ 109.6