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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 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 $ 0.0 $ 0.0
Production performance obligations satisfied in prior period, amount recognized 0.0 0.0 0.0 1.4
Revenue recognized in contract liability 0.1 $ 0.3 0.5 $ 0.7
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  
Minimum        
Disaggregation of Revenue [Line Items]        
Primary term of contract     3 years  
Maximum        
Disaggregation of Revenue [Line Items]        
Primary term of contract     5 years