Commitments and Contingencies (Details) T in Millions, $ in Millions		3 Months Ended
	Sep. 29, 2020 USD ($)	Mar. 31, 2025 USD ($) officer lawsuit plaintiff T	Dec. 31, 2024 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of class action lawsuits | lawsuit		4
Number of officers | officer		2
Number of plaintiffs | plaintiff		2
Royalty payment, percentage of net profit		4.00%
Royalty payment, annual advance		$ 0.1	$ 0.1
Royalty payment, annual tons mined threshold | T		5.0
Royalty payment, maximum lease payments		$ 7.6	7.6
Payments for royalties to date		$ 3.3
Proceeds from sale of royalty to Sprott	$ 30.0
Smelter royalty obligation, percentage	1.50%
Royalty obligation, metal price discount rate (percent)		5.00%
Royalty obligation
Unrecorded Unconditional Purchase Obligation [Line Items]
Royalty obligation, fair value		$ 146.7	146.7
Other assets, noncurrent
Unrecorded Unconditional Purchase Obligation [Line Items]
Payments for royalties to date			$ 0.6