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Market Risk Benefits - Net Asset (Liability) Balances and Changes in Valuation of MRBs for Asia - Guaranteed Pension (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
Principal Asset Management | International Pension | Guaranteed pension | Asia    
Net asset (liability) balances and the changes in the valuation of the MRBs    
Balance at beginning of period, market risk benefits (21.3) (26.0)
Effect of changes in nonperformance risk at beginning of period 1.0 1.2
Adjusted balance at beginning of period, market risk benefits (20.3) (24.8)
Interest accrual and expected policyholder behavior (0.2) (10.1)
Benefit payments 20.2 13.8
Changes in interest rates (0.6) 1.2
Changes in equity markets 0.7 0.2
Actual policyholder behavior different from expected behavior $ 0.2 (0.6)
Adjusted balance at end of period, market risk benefits   (20.3)
Effect of changes in nonperformance risk at end of period   1.0
Balance at end of period, market risk benefits   $ (21.3)
Weighted-average attained age of policyholders (years)   54 years
Net amount at risk   $ 25.1