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Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM - Parenthetical (Details) - Held To Maturity Debt Securities - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Debt securities net unrealized loss remaining in AOCI included in book value for AFS securities transferred to HTM securities $ 658.0 $ 831.0
Asset Not Pledged as Collateral    
Schedule of Held-to-maturity Securities [Line Items]    
Debt securities 67.3 1,500.0
Asset pledged as collateral    
Schedule of Held-to-maturity Securities [Line Items]    
Debt securities $ 8,100.0 $ 6,900.0