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Commitments and Contingencies - Crude Oil Releases (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) crudeOilRelease | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of crude oil releases | crudeOilRelease | 1 |  |
Environmental exit costs, costs accrued to date |  | $ 0.5 | $ 7.1
Operating and maintenance expenses |  |  |
Loss Contingencies [Line Items] |  |  |
Accrual for environmental loss contingencies | $ 0.3 |  |
Greenville Dixon Release |  |  |
Loss Contingencies [Line Items] |  |  |
Accrual for environmental loss contingencies, charges to expenses | 2.7 |  |
Accrual for environmental loss contingencies | $ 0.8 |  |

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