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Commitments and Contingencies (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 29, 2022 USD ($) | Oct. 09, 2015 buyer | Dec. 31, 2007 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Take-or-pay arrangement term (up to) | 20 years |  |  |  |  |
Take-or-pay obligations | $ 1,400.0 |  |  |  |  |
Take or pay obligations due in one year | 103.0 |  |  |  |  |
Securities class action settlement |  |  |  | $ 4.6 |  |
Patriot Coal Corporation |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Number of buyers | buyer |  |  |  |  | 2 |
Patriot Coal Corporation | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Black Lung Occupational Disease Liability |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Loss contingency accrual | 82.3 | $ 87.2 |  |  |  | $ 150.0
Loss contingency accrual, mark-to-market adjustment | 2.7 | $ 2.1 | $ 4.2 |  |  |
Capital Additions |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Unrecorded unconditional purchase obligation (within next five years) | 102.1 |  |  |  |  |
Unrecorded unconditional purchase obligation (within next 12 months) | $ 94.1 |  |  |  |  |

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