Segmented Information (Segment assets and liabilities) (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of operating segments [line items] | ||
| Total Assets | $ 6,384.6 | $ 5,336.1 |
| Total liabilities | 1,938.8 | 1,751.9 |
| Corporate/Other | ||
| Disclosure of operating segments [line items] | ||
| Total Assets | 669.7 | 280.0 |
| Total liabilities | 582.3 | 559.3 |
| Operating segments | Young-Davidson | ||
| Disclosure of operating segments [line items] | ||
| Total Assets | 1,838.4 | 1,758.6 |
| Total liabilities | 584.0 | 459.8 |
| Operating segments | Island Gold District | ||
| Disclosure of operating segments [line items] | ||
| Total Assets | 3,179.3 | 2,756.6 |
| Total liabilities | 607.9 | 572.4 |
| Operating segments | Mulatos | ||
| Disclosure of operating segments [line items] | ||
| Total Assets | 697.2 | 540.9 |
| Total liabilities | $ 164.6 | $ 160.4 |