Income and Mining Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Valuation Allowance [Line Items]
Change in deferred tax asset, valuation allowance		$ (209,800,000)
Valuation allowance		303,518,000	$ 490,044,000
Operating loss carryforwards, domestic		522,600,000
Operating loss carryforwards, state and local		402,000,000
Operating loss carryforwards subject to expiration		$ 313,800,000
Expiration term		20 years
Operating loss carryforwards not subject to expiration		$ 208,800,000
Unrecognized tax benefits		34,400,000	0	$ 2,000
Income-tax related interest and penalties		15,300,000	$ 0	$ 0
Forecast | Minimum
Valuation Allowance [Line Items]
Unrecognized tax benefits, period increase (decrease)	$ 25,000,000
Forecast | Maximum
Valuation Allowance [Line Items]
Unrecognized tax benefits, period increase (decrease)	$ 26,000,000
Current Year Income
Valuation Allowance [Line Items]
Change in deferred tax asset, valuation allowance		(73,300,000)
Forecasted Future Year Income
Valuation Allowance [Line Items]
Change in deferred tax asset, valuation allowance		(136,500,000)
U.S. Federal And State Deferred Tax Assets
Valuation Allowance [Line Items]
Valuation allowance		$ 52,400,000