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Segmented Information (Segment assets and liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]    
Total Assets $ 3,313.8 $ 2,492.2
Total liabilities 632.6 732.8
Operating segments [member] | Young-Davidson [Member]    
Disclosure of operating segments [line items]    
Total Assets 1,580.9 1,548.9
Total liabilities 243.4 260.4
Operating segments [member] | Mulatos [Member]    
Disclosure of operating segments [line items]    
Total Assets 350.0 335.5
Total liabilities 93.8 88.4
Operating segments [member] | Island Gold [Member]    
Disclosure of operating segments [line items]    
Total Assets 849.6 0.0
Total liabilities 222.5 0.0
Operating segments [member] | El Chanate [Member]    
Disclosure of operating segments [line items]    
Total Assets 111.4 113.5
Total liabilities 24.3 27.8
Corporate and other [Member]    
Disclosure of operating segments [line items]    
Total Assets 421.9 494.3
Total liabilities $ 48.6 $ 356.2