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Investments - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Investment Holdings    
Investment grade rating 94.90%  
Fair Value $ 5,272.1 $ 6,239.3
FHLB funding agreements $ 842.5 $ 787.5
Investment Grade    
Investment Holdings    
Increase in credit spread (percent) 0.69%  
Decrease in total returns (percent) 18.30%  
Increase to Bloomberg Barclays Index Yield-To-Worst (percent) 3.40%  
Bloomberg Barclays Index Yield-to-Worst 5.70%  
High Yield    
Investment Holdings    
Increase in credit spread (percent) 2.33%  
Decrease in total returns (percent) 14.60%  
Increase to Bloomberg Barclays Index Yield-To-Worst (percent) 5.50%  
Bloomberg Barclays Index Yield-to-Worst 9.70%  
10-year U.S. Treasury    
Investment Holdings    
Increase in interest rates 2.32%  
Federal interest rate on securities (percent) 3.83% 1.51%
FHLB of Chicago    
Investment Holdings    
Fair Value $ 920.7 $ 870.1
Governmental Agencies as Required by Law in Various States    
Investment Holdings    
Fair Value $ 30.0 $ 26.2