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Market Risk Benefits - Net Asset (Liability) Balances and Changes in Valuation of the MRBs for Individual Variable Annuities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Net asset (liability) balances and the changes in the valuation of the MRBs    
Balance at beginning of period, market risk benefits $ 20.2  
Balance at end of period, market risk benefits 137.4 $ 20.2
Retirement and Income Solutions | Individual variable annuities    
Net asset (liability) balances and the changes in the valuation of the MRBs    
Balance at beginning of period, market risk benefits 41.5 (72.2)
Effect of changes in nonperformance risk at beginning of period 7.7 (31.7)
Adjusted balance at beginning of period, market risk benefits 49.2 (103.9)
Interest accrual and expected policyholder behavior (66.8) (80.9)
Benefit payments 0.6 0.4
Changes in interest rates 100.4 39.9
Changes in equity markets 92.4 155.1
Changes in equity index volatility 12.0 47.9
Actual policyholder behavior different from expected behavior (12.7) (4.0)
Changes in future expected policyholder behavior (20.2)  
Changes in other future expected assumptions 1.5 (5.3)
Adjusted balance at end of period, market risk benefits 156.4 49.2
Effect of changes in nonperformance risk at end of period 19.0 7.7
Balance at end of period, market risk benefits $ 137.4 $ 41.5
Weighted-average attained age of policyholders (years) 67 years 4 months 24 days 67 years 8 months 12 days
Net amount at risk $ 46.8 $ 111.2