Costs of Sales (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Costs of Sales | ||||
| Costs of stream sales | $ 30.3 | $ 25.9 | $ 63.7 | $ 56.0 |
| Mineral production taxes | 0.8 | 0.7 | 1.4 | 1.2 |
| Mining costs of sales | 31.1 | 26.6 | 65.1 | 57.2 |
| Energy costs of sales | 2.4 | 2.5 | 6.9 | 5.5 |
| Total costs of sales | $ 33.5 | $ 29.1 | $ 72.0 | $ 62.7 |