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Segmented Information (Segment assets and liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of operating segments [line items] |  |
Total Assets | $ 5,336.1 | $ 4,001.2
Total liabilities | 1,751.9 | 1,077.7
Corporate/Other |  |
Disclosure of operating segments [line items] |  |
Total Assets | 280.0 | 222.9
Total liabilities | 559.3 | 46.8
Operating segments | Young-Davidson |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,758.6 | 1,693.2
Total liabilities | 459.8 | 381.8
Operating segments | Island Gold |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,683.1 | 1,453.6
Total liabilities | 534.5 | 476.4
Operating segments | Magino |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,073.5 | 0.0
Total liabilities | 37.9 | 0.0
Operating segments | Mulatos |  |
Disclosure of operating segments [line items] |  |
Total Assets | 540.9 | 631.5
Total liabilities | $ 160.4 | $ 172.7

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