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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