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Derivative Financial Instruments - Clearinghouse Margin and Collateral (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Derivative contracts    
Initial margin collateral posted $ 1.2 $ 1.7
Interest rate swaps    
Derivative contracts    
Cash collateral posted 48.1  
Financial instruments pledged as collateral 29.9 30.3
Cash pledged as collateral 1.2 18.1
Chicago Mercantile Exchange (CME) and London Clearing House (LCH)    
Derivative contracts    
Variation margin $ 39.2 $ 50.9