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Segmented Information (Segment revenues and results) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]    
Operating revenues $ 542.8 $ 482.2
Cost of sales    
Cost of sales 315.6 297.0
Royalties 15.6 13.3
Amortization 125.6  
Cost of sales 456.8 429.3
Expenses    
Exploration 8.3 5.1
Corporate and administrative 15.5 16.3
Share-based compensation 6.2  
EARNINGS FROM OPERATIONS 56.0 21.3
Finance expense (9.1) (24.0)
Foreign exchange loss 5.0 (12.5)
Other gains (loss) (0.6) 7.6
Loss on redemption of senior secured notes (29.1) 0.0
EARNINGS (LOSS) BEFORE INCOME TAXES 22.2 (7.6)
Operating segments [member] | Young-Davidson [Member]    
Disclosure of operating segments [line items]    
Operating revenues 249.7 211.9
Cost of sales    
Cost of sales 125.9 107.4
Royalties 4.4 3.7
Amortization 83.1 72.6
Cost of sales 213.4 183.7
Expenses    
Exploration 0.0 0.0
Corporate and administrative 0.0 0.0
Share-based compensation 0.0 0.0
EARNINGS FROM OPERATIONS 36.3 28.2
Operating segments [member] | Mulatos [Member]    
Disclosure of operating segments [line items]    
Operating revenues 201.4 187.3
Cost of sales    
Cost of sales 112.9 117.2
Royalties 10.6 9.6
Amortization 29.5 37.8
Cost of sales 153.0 164.6
Expenses    
Exploration 6.7 2.0
Corporate and administrative 0.0 0.0
Share-based compensation 0.0 0.0
EARNINGS FROM OPERATIONS 41.7 20.7
Operating segments [member] | Island Gold [Member]    
Disclosure of operating segments [line items]    
Operating revenues 14.9 83.0
Cost of sales    
Cost of sales 4.1 72.4
Royalties 0.6 0.0
Amortization 8.7 8.6
Cost of sales 13.4 81.0
Expenses    
Exploration 0.0 0.0
Corporate and administrative 0.0 0.0
Share-based compensation 0.0 0.0
EARNINGS FROM OPERATIONS 1.5 2.0
Operating segments [member] | El Chanate [Member]    
Disclosure of operating segments [line items]    
Operating revenues 76.8 0.0
Cost of sales    
Cost of sales 72.7 0.0
Royalties 0.0 0.0
Amortization 4.3 0.0
Cost of sales 77.0 0.0
Expenses    
Exploration 0.0 3.1
Corporate and administrative 0.0 16.3
Share-based compensation 0.0 10.2
EARNINGS FROM OPERATIONS (0.2) (29.6)
Corporate and other [Member]    
Disclosure of operating segments [line items]    
Operating revenues 0.0 482.2
Cost of sales    
Cost of sales 0.0 297.0
Royalties 0.0 13.3
Amortization 0.0 119.0
Cost of sales 0.0 429.3
Expenses    
Exploration 1.6 5.1
Corporate and administrative 15.5 16.3
Share-based compensation 6.2 10.2
EARNINGS FROM OPERATIONS $ (23.3) $ 21.3