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Derivative Financial Instruments - Clearinghouse Margin and Collateral (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Derivative contracts    
Initial margin collateral posted $ 1.7 $ 4.8
Interest rate swaps    
Derivative contracts    
Financial instruments pledged as collateral 30.3 30.8
Cash pledged as collateral 18.1 25.2
Chicago Mercantile Exchange (CME) and London Clearing House (LCH)    
Derivative contracts    
Variation margin $ 50.9 $ 129.9