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Derivative Financial Instruments - Clearinghouse Margin and Collateral (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative contracts |  |
Initial margin cash collateral posted | $ 0.2 |
Initial margin cash collateral received |  | $ 1.7
Interest rate swaps |  |
Derivative contracts |  |
Cash collateral posted | 47.5 |
Financial instruments pledged as collateral | 29.7 | 30.3
Cash pledged as collateral | 0.2 | 18.1
Chicago Mercantile Exchange (CME) and London Clearing House (LCH) |  |
Derivative contracts |  |
Variation margin | $ 40.8 | $ 50.9

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