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Commitments and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Long-term Purchase Commitment [Line Items] |  |  |
Take-or-pay arrangement term (up to) | 19 years |  |
Take-or-pay obligations | $ 1,000.0 |  |
Take or pay obligations due in one year | 113.0 |  |
Returned deposit related to terminated acquisition | 29.0 | $ 0.0 | $ 0.0
Deposit associated with terminated acquisition | 0.0 | $ 75.0 | $ 0.0
Arbitration Relating to Terminated Anglo American Acquisition [Domain] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Returned deposit related to terminated acquisition | 29.0 |  |
Deposit associated with terminated acquisition | 75.0 |  |
Metropolitan Mine Stormwater Discharge |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Litigation Settlement, Fee Expense | 0.2 |  |
Litigation Settlement, Other Cost | 0.3 |  |
Capital Additions |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Unrecorded unconditional purchase obligation (within next twelve months) | $ 49.8 |  |

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- Definition Represents the estimated contractual cash spend in the next twelve months after the balance sheet date related to various short term take or pay arrangements in the U.S. and Australia associated with rail and port commitments for the delivery of coal including amounts relating to export facilities. + References No definition available. + Details
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