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Derivative Financial Instruments - Clearinghouse Margin and Collateral (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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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

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- Definition Amount of variation margin cash paid under certain derivative contracts cleared through clearinghouses that is treated as a settlement and applied as a direct reduction of the fair value of the net derivative liability with such clearinghouses. + References No definition available. + Details
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