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Reinsurance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Effects of Reinsurance [Line Items]            
Net Realized Investment Gain (Loss) $ (0.1) $ 4.4 $ 85.4 $ (105.8)    
Other Expenses 251.5 232.3 746.8 724.2    
Reinsurance Recoverables, Incurred but Not Reported Claims 8,854.8 $ 2,261.7 8,854.8 $ 2,261.7 $ 8,378.9 $ 2,246.8
Closed Block Individual Disability Reinsurance Transaction            
Effects of Reinsurance [Line Items]            
Amortization of Prepaid Reinsurance Premium (19.7)   (59.4)      
Closed Block Individual Disability Reinsurance Transaction | Phase 2            
Effects of Reinsurance [Line Items]            
Negative Ceding Commission (18.2)   (18.2)      
Net Realized Investment Gain (Loss)     67.6      
Increase in Benefits and Change in Reserves for Future Benefits     133.1      
Other Expenses     6.2      
Reinsurance Recoverables, Incurred but Not Reported Claims 990.0   990.0      
Prepaid Reinsurance Premiums 43.1   43.1      
Deposit Contracts, Assets 5.0   5.0      
Closed Block Individual Disability Reinsurance Transaction | Phases 1 and 2 [Member]            
Effects of Reinsurance [Line Items]            
Prepaid Reinsurance Premiums 854.8   854.8      
Deposit Contracts, Assets $ 91.8   $ 91.8