Commitments and Contingencies (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Jan. 01, 2026 |
Dec. 31, 2025 |
|---|---|---|---|
| Other Commitments [Line Items] | |||
| Restricted cash, long-term | $ 9.2 | $ 8.5 | |
| Supply agreement performance bond | 3.9 | $ 4.0 | |
| Supply agreement performance bond outstanding amount | $ 0.3 | ||
| 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 |