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Segmented Information (Segment assets and liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of operating segments [line items] |  |
Total Assets | $ 3,674.2 | $ 3,621.5
Total liabilities | 953.1 | 885.9
Corporate and other |  |
Disclosure of operating segments [line items] |  |
Total Assets | 200.8 | 283.4
Total liabilities | 41.3 | 61.1
Operating segments | Young-Davidson |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,644.9 | 1,684.5
Total liabilities | 353.2 | 319.3
Operating segments | Mulatos1 |  |
Disclosure of operating segments [line items] |  |
Total Assets | 606.0 | 539.2
Total liabilities | 143.1 | 155.0
Operating segments | Island Gold |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,222.5 | 1,114.4
Total liabilities | $ 415.5 | $ 350.5

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