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Segmented Information (Segment assets and liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of operating segments [line items] |  |
Total Assets | $ 3,621.5 | $ 3,636.5
Total liabilities | 885.9 | 785.0
Operating segments [member] | Young-Davidson [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,684.5 | 1,652.8
Total liabilities | 319.3 | 275.8
Operating segments [member] | Mulatos [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 539.2 | 420.9
Total liabilities | 155.0 | 120.1
Operating segments [member] | Island Gold [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,094.1 | 995.0
Total liabilities | 350.5 | 301.1
Corporate and other [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 303.7 | 567.8
Total liabilities | $ 61.1 | $ 88.0

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