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Deposit Asset on Reinsurance - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2019
Dec. 31, 2020
Apr. 01, 2019
Effects of Reinsurance [Line Items]          
Reinsurance block of in-force fixed and variable annuity business     $ 2,900.0    
Fixed annuity reserves reinsured on a coinsurance basis         $ 2,200.0
Separate account asset $ 3,052.9     $ 2,891.4  
Separate account liability 3,052.9     $ 2,891.4  
Interest accrued on reinsurance deposit 24.4 $ 23.7      
Reinsurance Contract Modified Coinsurance Basis          
Effects of Reinsurance [Line Items]          
Separate account asset 700.0        
Separate account liability $ 700.0        
Reinsurance Deposit Receivable | Third Party Reinsurer Risk          
Effects of Reinsurance [Line Items]          
Concentration risk, percent     50.00%    
Minimum          
Effects of Reinsurance [Line Items]          
Minimum crediting rating     4.50%