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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]    
Third-party lessee payment lag for oil and natural gas delivery 90 days  
Change in prior period estimate $ 0.0 $ 0.0
Performance obligations satisfied in prior period, amount recognized 0.0 1.4
Opening contract liability 0.7 $ 0.8
Contract assets recognized 0.0  
Thacker Pass    
Disaggregation of Revenue [Line Items]    
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