Decommissioning Liabilities (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Asset Retirement Obligation Disclosure [Line Items] | ||
| Estimated reclamation discount rate | 3.30% | 3.00% |
| Closure cost obligations discount rate | 8.60% | 7.40% |
| Decommissioning liabilities | $ 193.8 | $ 165.2 |
| Bottom of range | ||
| Asset Retirement Obligation Disclosure [Line Items] | ||
| Inflation rate | 1.80% | 1.70% |
| Top of range | ||
| Asset Retirement Obligation Disclosure [Line Items] | ||
| Inflation rate | 3.70% | 3.60% |