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Deposit Asset on Reinsurance - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Effects of Reinsurance        
Reinsurance block of in-force fixed and variable annuity business $ 3,200.0   $ 2,900.0 $ 2,900.0
Percentage of forced fixed annuities (percent) 50.00%      
Fixed annuity reserves reinsured on a coinsurance basis $ 2,400.0      
Separate account asset 3,441.0 $ 2,891.4    
Separate account liability 3,441.0 2,891.4    
Net Investment Income 422.5 357.6 365.1  
Reinsurance Contract Modified Coinsurance Basis        
Effects of Reinsurance        
Separate account asset 800.0      
Separate account liability $ 800.0      
Minimum        
Effects of Reinsurance        
Minimum crediting rating 4.50%      
Deposit Asset On Reinsurance        
Effects of Reinsurance        
Net Investment Income $ 101.1 $ 97.3 $ 70.8