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Segmented Information (Segment assets and liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of operating segments [line items] |  |
Total Assets | $ 4,001.2 | $ 3,674.2
Total liabilities | 1,077.7 | 953.1
Corporate and other |  |
Disclosure of operating segments [line items] |  |
Total Assets | 222.9 | 200.8
Total liabilities | 46.8 | 41.3
Operating segments | Young-Davidson |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,693.2 | 1,644.9
Total liabilities | 381.8 | 353.2
Operating segments | Mulatos1 |  |
Disclosure of operating segments [line items] |  |
Total Assets | 631.5 | 606.0
Total liabilities | 172.7 | 143.1
Operating segments | Island Gold |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,453.6 | 1,222.5
Total liabilities | $ 476.4 | $ 415.5

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