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Deferred Acquisition Costs and Other Actuarial Balances - Benefits and Protection - Balances and changes in DAC (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs $ 4,006.9  
Ending balance, Deferred acquisition costs 4,057.3 $ 4,006.9
Benefits and Protection    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 3,013.2  
Ending balance, Deferred acquisition costs 3,021.2 3,013.2
Individual disability | Benefits and Protection | Specialty Benefits    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 696.9 667.7
Costs deferred 54.0 79.0
Amortized to expense (40.3) (49.8)
Ending balance, Deferred acquisition costs 710.6 696.9
Universal life | Benefits and Protection | Life Insurance    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 1,527.7 1,545.3
Costs deferred 61.2 76.7
Amortized to expense (71.1) (94.3)
Ending balance, Deferred acquisition costs 1,517.8 1,527.7
Term life | Benefits and Protection | Life Insurance    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 710.8 695.1
Costs deferred 56.3 78.3
Amortized to expense (47.1) (62.6)
Ending balance, Deferred acquisition costs 720.0 710.8
Participating life | Benefits and Protection | Life Insurance    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 77.8 84.7
Costs deferred 1.0 1.7
Amortized to expense (6.0) (8.6)
Ending balance, Deferred acquisition costs $ 72.8 $ 77.8