Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Disaggregation of Revenue [Line Items] | ||||
| Third-party lessee payment lag for oil and natural gas delivery | 90 days | |||
| Change in prior period estimate | $ 1.6 | $ 0.0 | $ 0.0 | $ 0.0 |
| Production performance obligations satisfied in prior period, amount recognized | 0.0 | $ 0.0 | 0.0 | $ 1.5 |
| Contract assets recognized | 0.0 | 0.0 | ||
| Thacker Pass | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Advance paid | 3.5 | 3.5 | ||
| Cost reimbursement, commercial mining milestone, fee | $ 4.7 | $ 4.7 | ||
| X | ||||||||||
- Definition Commercial Mining Milestone Success Fee No definition available.
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| X | ||||||||||
- Definition Contract With Customer, Variable Consideration From Uncertainty Of Collectability, Change In Prior Period Estimate No definition available.
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| X | ||||||||||
- Definition Contract With Customer, Variable Consideration From Uncertainty Of Collectability, Production Performance Obligation Satisfied in Previous Period No definition available.
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- Definition Long Term Contract Asset, Customer Advance No definition available.
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| X | ||||||||||
- Definition Third-Party Lessee Payment Lag for Oil and Natural Gas Delivery No definition available.
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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