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Segmented Information (Segment revenues and results) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]    
Operating revenues $ 823.6 $ 748.1
Cost of sales    
Cost of sales 351.5 312.6
Royalties 11.7 10.2
COVID costs   6.5
Amortization 170.9 152.7
Cost of sales 534.1 482.0
Expenses    
Exploration 14.7 7.2
Corporate and administrative 24.5 21.0
Share-based compensation 11.1 10.3
Pre-tax impairment charge 224.3 0.0
EARNINGS FROM OPERATIONS 14.9 227.6
Finance costs (4.5) (4.3)
Foreign exchange loss (0.9) (1.4)
Other loss (7.2) (3.7)
EARNINGS BEFORE INCOME TAXES 2.3 218.2
Operating segments [member] | Young-Davidson [Member]    
Disclosure of operating segments [line items]    
Operating revenues 350.5 239.4
Cost of sales    
Cost of sales 159.7 133.9
Royalties 5.3 3.7
COVID costs   0.0
Amortization 79.4 63.7
Cost of sales 244.4 201.3
Expenses    
Exploration 0.7 0.0
Corporate and administrative 0.0 0.0
Share-based compensation 0.0 0.0
EARNINGS FROM OPERATIONS 105.4 38.1
Operating segments [member] | Mulatos [Member]    
Disclosure of operating segments [line items]    
Operating revenues 221.1 261.7
Cost of sales    
Cost of sales 123.1 120.9
Royalties 1.1 1.3
COVID costs   2.0
Amortization 53.2 44.6
Cost of sales 177.4 168.8
Expenses    
Exploration 7.3 4.2
Corporate and administrative 0.0 0.0
Share-based compensation 0.0 0.0
EARNINGS FROM OPERATIONS 36.4 88.7
Operating segments [member] | Island Gold [Member]    
Disclosure of operating segments [line items]    
Operating revenues 252.0 247.0
Cost of sales    
Cost of sales 68.7 57.8
Royalties 5.3 5.2
COVID costs   4.5
Amortization 38.3 44.4
Cost of sales 112.3 111.9
Expenses    
Exploration 4.7 1.0
Corporate and administrative 0.0 0.0
Share-based compensation 0.0 0.0
EARNINGS FROM OPERATIONS 135.0 134.1
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 24.5 21.0
Share-based compensation 11.1 10.3
Pre-tax impairment charge 224.3  
EARNINGS FROM OPERATIONS $ (261.9) $ (33.3)