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Derivative Financial Instruments - Clearinghouse Margin and Collateral (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Derivative contracts    
Initial margin cash collateral posted $ 0.0 $ 0.4
Interest rate derivatives    
Derivative contracts    
Cash pledged as collateral 0.0 0.4
Received cash as collateral 18.1 30.0
Securities received as collateral 25.4 43.7
Chicago Mercantile Exchange (CME) and London Clearing House (LCH)    
Derivative contracts    
Variation margin $ 0.8 $ 1.2