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Deferred Acquisition Costs and Other Actuarial Balances - Benefits and Protection - Balances and changes in DAC (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs $ 4,006.9  
Ending balance, Deferred acquisition costs 4,034.1 $ 4,006.9
Benefits and Protection    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 3,013.2  
Ending balance, Deferred acquisition costs 3,016.9 3,013.2
Individual disability | Benefits and Protection | Specialty Benefits    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 696.9 667.7
Costs deferred 18.3 79.0
Amortized to expense (13.3) (49.8)
Ending balance, Deferred acquisition costs 701.9 696.9
Universal life | Benefits and Protection | Life Insurance    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 1,527.7 1,545.3
Costs deferred 22.0 76.7
Amortized to expense (23.8) (94.3)
Ending balance, Deferred acquisition costs 1,525.9 1,527.7
Term life | Benefits and Protection | Life Insurance    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 710.8 695.1
Costs deferred 17.9 78.3
Amortized to expense (15.6) (62.6)
Ending balance, Deferred acquisition costs 713.1 710.8
Participating life | Benefits and Protection | Life Insurance    
Deferred Acquisition Costs    
Beginning balance, Deferred acquisition costs 77.8 84.7
Costs deferred 0.3 1.7
Amortized to expense (2.1) (8.6)
Ending balance, Deferred acquisition costs $ 76.0 $ 77.8