Commitments and Contingencies (Details) T in Millions, $ in Millions			12 Months Ended
	Sep. 29, 2020 USD ($)	May 29, 2020 USD ($)	Dec. 31, 2024 USD ($) T	Dec. 31, 2023 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Royalty payment, percentage of net profit			4.00%	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	3.3
Proceeds from sale of royalty to Sprott	$ 30.0	$ 30.0
Smelter royalty obligation, percentage	1.50%	1.50%
Royalty obligation, metal price discount rate			5.00%
Life of mine plan (in years)			34 years
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	$ 0.6