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Reinsurance (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Effects of Reinsurance        
Net Realized Investment Gain (Loss) $ 84.6 $ (144.0)    
Transaction Costs Related to Reinsurance Transaction 245.0 235.6    
Reinsurance Recoverables, Incurred but Not Reported Claims 9,225.8 $ 2,260.7 $ 8,378.9 $ 2,246.8
Closed Block Individual Disability Reinsurance Transaction        
Effects of Reinsurance        
Amortization of the Cost of Reinsurance 20.0      
Closed Block Individual Disability Reinsurance Transaction | Phase 2        
Effects of Reinsurance        
Negative Ceding Commission (18.2)      
Net Realized Investment Gain (Loss) 67.6      
Increase in Benefits and Change in Reserves for Future Benefits 133.1      
Transaction Costs Related to Reinsurance Transaction 6.2      
Reinsurance Recoverables, Incurred but Not Reported Claims 990.0      
Prepaid Reinsurance Premiums 43.1      
Deposit Contracts, Assets 5.0      
Closed Block Individual Disability Reinsurance Transaction | Phases 1 and 2        
Effects of Reinsurance        
Prepaid Reinsurance Premiums 854.8      
Deposit Contracts, Assets $ 91.8