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Segmented Information (Segment assets and liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of operating segments [line items] |  |
Total Assets | $ 3,396.5 | $ 3,272.2
Total liabilities | 701.2 | 669.9
Operating segments [member] | Young-Davidson [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 1,595.8 | 1,569.4
Total liabilities | 264.6 | 272.3
Operating segments [member] | Mulatos [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 411.3 | 373.9
Total liabilities | 102.6 | 102.4
Operating segments [member] | Island Gold [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 921.4 | 876.2
Total liabilities | 269.4 | 236.3
Operating segments [member] | El Chanate [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 13.4 | 35.9
Total liabilities | 4.2 | 5.9
Operating segments [member] | Kirazli Segment [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 147.5 | 120.9
Total liabilities | 14.9 | 10.1
Corporate and other [Member] |  |
Disclosure of operating segments [line items] |  |
Total Assets | 307.1 | 295.9
Total liabilities | $ 45.5 | $ 42.9

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