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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue recognized in contract liability | $ 0.2 | $ 0.2
Contract assets recognized | 0.0 |
Thacker Pass |  |
Disaggregation of Revenue [Line Items] |  |
Reimbursable costs revenue | 1.5 | $ 0.1
Advance paid | 3.5 |
Cost reimbursement, commercial mining milestone, fee | $ 4.7 |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Primary term of contract | 3 years |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Primary term of contract | 5 years |
Maximum | Thacker Pass |  |
Disaggregation of Revenue [Line Items] |  |
Capital expenditures | $ 50.0 |

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