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Derivative Financial Instruments - Clearinghouse Margin and Collateral (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Derivative contracts    
Cash collateral received $ 1.5 $ 1.7
Interest rate swaps    
Derivative contracts    
Cash collateral received 9.1  
Financial instruments pledged as collateral 29.9 30.3
Cash pledged as collateral   18.1
Chicago Mercantile Exchange (CME) and London Clearing House (LCH)    
Derivative contracts    
Variation margin $ 4.4 $ 50.9