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Subsequent Events (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Feb. 27, 2024
Subsequent Event [Line Items]              
Debt securities, available-for-sale, realized loss   $ 176.4 $ (6.9) $ 169.5 $ 214.0 $ 0.3  
Subsequent Event              
Subsequent Event [Line Items]              
Debt securities, available-for-sale, sold $ 2,200.0            
Debt securities, available-for-sale, realized loss $ 189.4            
Subsequent Event | Debt Securities              
Subsequent Event [Line Items]              
Deferred (gain) loss on discontinuation of fair value hedge             $ 18.4