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Deferred Acquisition Costs and Other Actuarial Balances - Retirement and Income Solutions - Balances and changes in DAC (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs $ 4,006.9  
Ending balance, Deferred acquisition costs 4,034.1 $ 4,006.9
Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 957.2  
Ending balance, Deferred acquisition costs 971.5 957.2
Workplace savings and retirement solutions | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 515.5 506.4
Costs deferred 13.3 47.7
Amortized to expense (9.4) (38.6)
Ending balance, Deferred acquisition costs 519.4 515.5
Individual variable annuities | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 323.4 279.5
Costs deferred 22.0 72.7
Amortized to expense (8.2) (28.8)
Ending balance, Deferred acquisition costs 337.2 323.4
Pension risk transfer | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 21.1 15.4
Costs deferred 1.5 6.6
Amortized to expense (0.3) (0.9)
Ending balance, Deferred acquisition costs 22.3 21.1
Individual fixed deferred annuities | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 84.2 106.1
Amortized to expense (4.4) (21.9)
Ending balance, Deferred acquisition costs 79.8 84.2
Investment only | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 13.0 11.5
Costs deferred 1.1 6.5
Amortized to expense (1.3) (5.0)
Ending balance, Deferred acquisition costs $ 12.8 $ 13.0