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Segmented Information (Segment revenues and results) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Operating revenues $ 748.1 $ 683.1
Cost of sales    
Cost of sales 312.6 339.0
Royalties 10.2 17.4
COVID costs 6.5 0.0
Amortization 152.7 165.0
Cost of sales 482.0 521.4
Expenses    
Exploration 7.2 6.7
Corporate and administrative 21.0 19.8
Share-based compensation 10.3 9.2
EARNINGS FROM OPERATIONS 227.6 126.0
Finance expense (4.3) (2.5)
Foreign exchange loss (1.4) 0.3
Other gain (3.7) 5.1
EARNINGS BEFORE INCOME TAXES 218.2 128.9
Operating segments [member] | Young-Davidson [Member]    
Disclosure of operating segments [line items]    
Operating revenues 239.4 262.1
Cost of sales    
Cost of sales 133.9 146.6
Royalties 3.7 4.4
COVID costs 0.0  
Amortization 63.7 80.1
Cost of sales 201.3 231.1
Expenses    
Exploration 0.0 0.0
Corporate and administrative 0.0 0.0
Share-based compensation 0.0 0.0
EARNINGS FROM OPERATIONS 38.1 31.0
Operating segments [member] | Mulatos [Member]    
Disclosure of operating segments [line items]    
Operating revenues 261.7 194.4
Cost of sales    
Cost of sales 120.9 107.8
Royalties 1.3 3.1
COVID costs 2.0  
Amortization 44.6 28.0
Cost of sales 168.8 138.9
Expenses    
Exploration 4.2 3.6
Corporate and administrative 0.0 0.0
Share-based compensation 0.0 0.0
EARNINGS FROM OPERATIONS 88.7 51.9
Operating segments [member] | Island Gold [Member]    
Disclosure of operating segments [line items]    
Operating revenues 247.0 207.3
Cost of sales    
Cost of sales 57.8 64.2
Royalties 5.2 9.9
COVID costs 4.5  
Amortization 44.4 55.3
Cost of sales 111.9 129.4
Expenses    
Exploration 1.0 1.1
Corporate and administrative 0.0
Share-based compensation 0.0
EARNINGS FROM OPERATIONS 134.1 76.8
Operating segments [member] | El Chanate [Member]    
Disclosure of operating segments [line items]    
Operating revenues   19.3
Cost of sales    
Cost of sales   20.4
Royalties   0.0
Amortization   1.6
Cost of sales   22.0
Expenses    
Exploration   0.0
Corporate and administrative   0.0
Share-based compensation   0.0
EARNINGS FROM OPERATIONS   (2.7)
Corporate and other [Member]    
Disclosure of operating segments [line items]    
Operating revenues 0.0 0.0
Cost of sales    
Cost of sales 0.0 0.0
Royalties 0.0 0.0
COVID costs 0.0  
Amortization 0.0 0.0
Cost of sales 0.0 0.0
Expenses    
Exploration 2.0 2.0
Corporate and administrative 21.0 19.8
Share-based compensation 10.3 9.2
EARNINGS FROM OPERATIONS $ (33.3) $ (31.0)