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Deferred Acquisition Costs and Other Actuarial Balances - Disaggregated DAC amounts (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred Acquisition Costs      
Deferred acquisition costs $ 3,972.9 $ 3,950.5  
Short-duration contracts      
Deferred Acquisition Costs      
Deferred acquisition costs 37.1 31.1  
Other balances      
Deferred Acquisition Costs      
Deferred acquisition costs 6.7 7.7  
Retirement and Income Solutions      
Deferred Acquisition Costs      
Deferred acquisition costs 925.1 918.9  
Retirement and Income Solutions | Workplace savings and retirement solutions      
Deferred Acquisition Costs      
Deferred acquisition costs 509.7 506.4 $ 498.0
Retirement and Income Solutions | Individual variable annuities      
Deferred Acquisition Costs      
Deferred acquisition costs 289.9 279.5 278.0
Retirement and Income Solutions | Pension risk transfer      
Deferred Acquisition Costs      
Deferred acquisition costs 17.7 15.4 8.1
Retirement and Income Solutions | Individual fixed deferred annuities      
Deferred Acquisition Costs      
Deferred acquisition costs 95.5 106.1 131.0
Retirement and Income Solutions | Investment only      
Deferred Acquisition Costs      
Deferred acquisition costs 12.3 11.5 14.9
Benefits and Protection      
Deferred Acquisition Costs      
Deferred acquisition costs excluding short-duration contracts and other balances. 3,004.0 2,992.8  
Benefits and Protection | Life Insurance | Universal life      
Deferred Acquisition Costs      
Deferred acquisition costs 1,537.9 1,545.3 1,569.7
Deferred acquisition costs excluding short-duration contracts and other balances. 1,537.9 1,545.3  
Benefits and Protection | Life Insurance | Term life      
Deferred Acquisition Costs      
Deferred acquisition costs 701.2 695.1 685.7
Deferred acquisition costs excluding short-duration contracts and other balances. 701.2 695.1  
Benefits and Protection | Life Insurance | Participating life      
Deferred Acquisition Costs      
Deferred acquisition costs 81.3 84.7 93.0
Deferred acquisition costs excluding short-duration contracts and other balances. 81.3 84.7  
Benefits and Protection | Specialty Benefits | Individual disability      
Deferred Acquisition Costs      
Deferred acquisition costs $ 683.6 $ 667.7 $ 626.1