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Future Policy Benefits and Claims - Retirement and Income Solutions (Details) - Retirement and Income Solutions - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 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   (53.4)
Effect of actual variances from expected experience (2.8) (14.6)
Adjusted beginning of period balance at original discount rate 24,889.1 22,943.0
Interest accrual 552.6 1,008.6
Benefit payments (1,092.0) (1,981.4)
Issuances 1,751.9 2,921.7
Balance at end of period at original discount rate 26,101.6 24,891.9
Effect of changes in discount rate assumptions at end of period (1,884.0) (1,036.1)
Balance at end of period, Present value of expected future policy benefit payments 24,217.6 23,855.8
Future policy benefits after reinsurance $ 24,217.6 $ 23,855.8
Weighted-average duration for future policy benefits (in years) 8 years 2 months 12 days 8 years 6 months
Increase (decrease) to LFPB due to effect of changes in discount rate assumptions $ (847.9) $ 763.5
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   (1.3)
Effect of actual variances from expected experience (3.9) (0.1)
Adjusted beginning of period balance at original discount rate 5,206.9 5,457.0
Interest accrual 105.8 219.1
Benefit payments (249.5) (507.3)
Issuances 27.9 42.0
Balance at end of period at original discount rate 5,091.1 5,210.8
Effect of changes in discount rate assumptions at end of period (455.0) (296.7)
Balance at end of period, Present value of expected future policy benefit payments 4,636.1 4,914.1
Reinsurance Impact (4,572.2) (4,869.1)
Future policy benefits after reinsurance $ 63.9 $ 45.0
Weighted-average duration for future policy benefits (in years) 7 years 7 months 6 days 7 years 10 months 24 days
Increase (decrease) to LFPB due to effect of changes in discount rate assumptions $ (158.3) $ 142.3