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Future Policy Benefits and Claims - Retirement and Income Solutions (Details) - Retirement and Income Solutions - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension risk transfer    
Present value of expected future policy benefit payments    
Balance at beginning of period, Present value of expected future policy benefit payments $ 23,855.8 $ 21,211.4
Effect of changes in discount rate assumptions at beginning of period 1,036.1 1,799.6
Balance at beginning of period at original discount rate 24,891.9 23,011.0
Effect of changes in cash flow assumptions (3.4) (53.4)
Effect of actual variances from expected experience (1.5) (14.6)
Adjusted beginning of period balance at original discount rate 24,887.0 22,943.0
Interest accrual 1,135.1 1,008.6
Benefit payments (2,238.1) (1,981.4)
Issuances 3,112.9 2,921.7
Balance at end of period at original discount rate 26,896.9 24,891.9
Effect of changes in discount rate assumptions at end of period (1,938.8) (1,036.1)
Balance at end of period, Present value of expected future policy benefit payments 24,958.1 23,855.8
Future policy benefits after reinsurance $ 24,958.1 $ 23,855.8
Weighted-average duration for future policy benefits (in years) 8 years 8 years 6 months
Individual fixed income annuities    
Present value of expected future policy benefit payments    
Balance at beginning of period, Present value of expected future policy benefit payments $ 4,914.1 $ 5,019.4
Effect of changes in discount rate assumptions at beginning of period 296.7 439.0
Balance at beginning of period at original discount rate 5,210.8 5,458.4
Effect of changes in cash flow assumptions (38.4) (1.3)
Effect of actual variances from expected experience (1.7) (0.1)
Adjusted beginning of period balance at original discount rate 5,170.7 5,457.0
Interest accrual 208.4 219.1
Benefit payments (500.2) (507.3)
Issuances 46.1 42.0
Balance at end of period at original discount rate 4,925.0 5,210.8
Effect of changes in discount rate assumptions at end of period (420.4) (296.7)
Balance at end of period, Present value of expected future policy benefit payments 4,504.6 4,914.1
Reinsurance impact (4,469.4) (4,869.1)
Future policy benefits after reinsurance $ 35.2 $ 45.0
Weighted-average duration for future policy benefits (in years) 7 years 2 months 12 days 7 years 10 months 24 days