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Segmented Information (Segment assets and liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of operating segments [line items] |  |
Total Assets | $ 3,636.5 | $ 3,396.5
Total liabilities | 785.0 | 701.2
Operating segments [member] | Young-Davidson [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,652.8 | 1,595.8
Total liabilities | 275.8 | 264.6
Operating segments [member] | Mulatos [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 420.9 | 411.3
Total liabilities | 120.1 | 102.6
Operating segments [member] | Island Gold [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 995.0 | 921.4
Total liabilities | 301.1 | 269.4
Operating segments [member] | Kirazli Segment [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 152.6 | 147.5
Total liabilities | 15.6 | 14.9
Corporate and other [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 415.2 | 320.5
Total liabilities | $ 72.4 | $ 49.7

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