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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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Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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