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Reinsurance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Effects of Reinsurance              
Net Investment Gain (Loss) $ (4.4) $ (0.1) $ (22.3) $ 85.4      
Other Expenses 247.3 251.5 744.4 746.8      
Reinsurance Recoverables, Incurred but Not Reported Claims $ 8,401.4 $ 8,854.8 8,401.4 8,854.8 $ 8,697.8   $ 8,378.9
Closed Block Individual Disability Reinsurance Transaction | Phase 2              
Effects of Reinsurance              
Negative Ceding Commission           $ (18.2)  
Net Investment Gain (Loss)       67.6      
Increase in Benefits and Change in Reserves for Future Benefits     $ 133.1 133.1      
Other Expenses       $ 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