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Deferred Acquisition Costs and Other Actuarial Balances - Retirement and Income Solutions - Balances and changes in DAC (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs $ 3,950.5    
Amortized to expense (392.5) $ (389.8) $ (386.9)
Ending balance, Deferred acquisition costs 4,006.9 3,950.5  
Retirement and Income Solutions      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 918.9    
Amortized to expense (95.2) (95.8) (101.0)
Ending balance, Deferred acquisition costs 957.2 918.9  
Workplace savings and retirement solutions | Retirement and Income Solutions      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 506.4 498.0  
Costs deferred 47.7 48.1  
Amortized to expense (38.6) (39.7)  
Ending balance, Deferred acquisition costs 515.5 506.4 498.0
Individual variable annuities | Retirement and Income Solutions      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 279.5 278.0  
Costs deferred 72.7 27.4  
Amortized to expense (28.8) (25.9)  
Ending balance, Deferred acquisition costs 323.4 279.5 278.0
Pension risk transfer | Retirement and Income Solutions      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 15.4 8.1  
Costs deferred 6.6 7.9  
Amortized to expense (0.9) (0.6)  
Ending balance, Deferred acquisition costs 21.1 15.4 8.1
Individual fixed deferred annuities | Retirement and Income Solutions      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 106.1 131.0  
Amortized to expense (21.9) (24.9)  
Ending balance, Deferred acquisition costs 84.2 106.1 131.0
Investment only | Retirement and Income Solutions      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 11.5 14.9  
Costs deferred 6.5 1.3  
Amortized to expense (5.0) (4.7)  
Ending balance, Deferred acquisition costs $ 13.0 $ 11.5 $ 14.9