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Deferred Acquisition Costs and Other Actuarial Balances - Disaggregated DAC amounts (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Deferred Acquisition Costs      
Deferred acquisition costs $ 4,057.3 $ 4,006.9  
Short-duration contracts      
Deferred Acquisition Costs      
Deferred acquisition costs 34.5 30.6  
Other balances      
Deferred Acquisition Costs      
Deferred acquisition costs 1.2 5.9  
Retirement and Income Solutions      
Deferred Acquisition Costs      
Deferred acquisition costs 1,000.4 957.2  
Retirement and Income Solutions | Workplace savings and retirement solutions      
Deferred Acquisition Costs      
Deferred acquisition costs 525.0 515.5 $ 506.4
Retirement and Income Solutions | Individual variable annuities      
Deferred Acquisition Costs      
Deferred acquisition costs 368.6 323.4 279.5
Retirement and Income Solutions | Pension risk transfer      
Deferred Acquisition Costs      
Deferred acquisition costs 23.8 21.1 15.4
Retirement and Income Solutions | Individual fixed deferred annuities      
Deferred Acquisition Costs      
Deferred acquisition costs 71.1 84.2 106.1
Retirement and Income Solutions | Investment only      
Deferred Acquisition Costs      
Deferred acquisition costs 11.9 13.0 11.5
Benefits and Protection      
Deferred Acquisition Costs      
Deferred acquisition costs 3,021.2 3,013.2  
Benefits and Protection | Life Insurance | Universal life      
Deferred Acquisition Costs      
Deferred acquisition costs excluding short-duration contracts and other balances 1,517.8 1,527.7 1,545.3
Benefits and Protection | Life Insurance | Term life      
Deferred Acquisition Costs      
Deferred acquisition costs excluding short-duration contracts and other balances 720.0 710.8 695.1
Benefits and Protection | Life Insurance | Participating life      
Deferred Acquisition Costs      
Deferred acquisition costs excluding short-duration contracts and other balances 72.8 77.8 84.7
Benefits and Protection | Specialty Benefits | Individual disability      
Deferred Acquisition Costs      
Deferred acquisition costs excluding short-duration contracts and other balances $ 710.6 $ 696.9 $ 667.7