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Pledged and Restricted Assets - Fair Value of Available for Sale Debt Securities Included In Pledged Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged $ 54,600.0 $ 47,500.0
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged 524.1 33.0
Derivative contracts    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Amount of securities and loans pledged $ 17.6 $ 27.1