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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Other Commitments [Line Items] |  |
Restricted cash, long-term | $ 8.5 | $ 8.5
Supply agreement performance bond | 4.0 |
Contract with customer, liability | 2.4 |
Tinuum Group, LLC |  |
Other Commitments [Line Items] |  |
Liabilities assumed | $ 1.7 | $ 1.7
Tinuum Group, LLC |  |
Other Commitments [Line Items] |  |
Limited guarantees (as percent) | 50.00% |
Five Forks Mine |  |
Other Commitments [Line Items] |  |
Surety bond amount | $ 7.5 |
Corbin Facilities |  |
Other Commitments [Line Items] |  |
Surety bond amount | 3.0 |
West Virginia ("Mine 4") |  |
Other Commitments [Line Items] |  |
Surety bond amount | 0.7 |
Restricted cash, long-term | $ 0.4 |

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