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Investments - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Investment Holdings    
Investment grade rating 92.70%  
Debt securities, available-for-sale $ 5,688.0 $ 6,239.3
FHLB funding agreements $ 866.5 $ 787.5
Investment Grade    
Investment Holdings    
Increase in credit spread (percent) 0.66%  
Decrease in total returns (percent) 13.90%  
Increase to Bloomberg Barclays Index Yield-To-Worst (percent) 2.40%  
Bloomberg Barclays Index Yield-to-Worst 4.70%  
High Yield    
Investment Holdings    
Increase in credit spread (percent) 2.77%  
Decrease in total returns (percent) 14.00%  
Increase to Bloomberg Barclays Index Yield-To-Worst (percent) 4.70%  
Bloomberg Barclays Index Yield-to-Worst 8.90%  
10-year U.S. Treasury    
Investment Holdings    
Increase in interest rates 1.50%  
Federal interest rate on securities (percent) 3.01% 1.51%
FHLB of Chicago    
Investment Holdings    
Debt securities, available-for-sale $ 959.6 $ 870.1
Governmental Agencies as Required by Law in Various States    
Investment Holdings    
Debt securities, available-for-sale $ 28.6 $ 26.2