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Deferred Acquisition Costs and Other Actuarial Balances - Retirement and Income Solutions - Balances and changes in DAC (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs $ 3,950.5  
Ending balance, Deferred acquisition costs 3,972.9 $ 3,950.5
Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 918.9  
Ending balance, Deferred acquisition costs 925.1 918.9
Workplace savings and retirement solutions | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 506.4 498.0
Costs deferred 23.4 48.1
Amortized to expense (20.1) (39.7)
Ending balance, Deferred acquisition costs 509.7 506.4
Individual variable annuities | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 279.5 278.0
Costs deferred 23.9 27.4
Amortized to expense (13.5) (25.9)
Ending balance, Deferred acquisition costs 289.9 279.5
Pension risk transfer | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 15.4 8.1
Costs deferred 2.7 7.9
Amortized to expense (0.4) (0.6)
Ending balance, Deferred acquisition costs 17.7 15.4
Individual fixed deferred annuities | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 106.1 131.0
Amortized to expense (10.6) (24.9)
Ending balance, Deferred acquisition costs 95.5 106.1
Investment only | Retirement and Income Solutions    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 11.5 14.9
Costs deferred 3.3 1.3
Amortized to expense (2.5) (4.7)
Ending balance, Deferred acquisition costs $ 12.3 $ 11.5