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Deferred Acquisition Costs and Other Actuarial Balances - Benefits and Protection - Balances and changes in DAC (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs $ 3,950.5    
Amortized to expense (392.5) $ (389.8) $ (386.9)
Ending balance, Deferred acquisition costs 4,006.9 3,950.5  
Benefits and Protection      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 3,023.9    
Amortized to expense (296.2) (292.9) (284.8)
Ending balance, Deferred acquisition costs 3,043.8 3,023.9  
Individual disability | Benefits and Protection | Specialty Benefits      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 667.7 626.1  
Costs deferred 79.0 86.7  
Amortized to expense (49.8) (45.1)  
Ending balance, Deferred acquisition costs 696.9 667.7 626.1
Universal life | Benefits and Protection | Life Insurance      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 1,545.3 1,569.7  
Costs deferred 76.7 70.7  
Amortized to expense (94.3) (95.1)  
Ending balance, Deferred acquisition costs 1,527.7 1,545.3 1,569.7
Term life | Benefits and Protection | Life Insurance      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 695.1 685.7  
Costs deferred 78.3 71.3  
Amortized to expense (62.6) (61.9)  
Ending balance, Deferred acquisition costs 710.8 695.1 685.7
Participating life | Benefits and Protection | Life Insurance      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 84.7 93.0  
Costs deferred 1.7 1.4  
Amortized to expense (8.6) (9.7)  
Ending balance, Deferred acquisition costs $ 77.8 $ 84.7 $ 93.0