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Segmented Information (Segment revenues and results) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]    
Operating revenues $ 1,023.3 $ 821.2
Cost of sales    
Mining and processing 437.3 394.4
Inventory net realizable value adjustment 0.0 33.9
Royalties 10.2 9.1
Amortization 190.2 171.5
Cost of sales 637.7 608.9
Expenses    
Exploration 18.2 18.4
Corporate and administrative 27.6 25.9
Share-based compensation 21.7 18.3
Impairment (note 8) 0.0 38.2
EARNINGS FROM OPERATIONS 318.1 111.5
Finance expense (2.5) (5.7)
Foreign exchange gain 1.9 1.7
Other loss (23.8) (5.1)
EARNINGS BEFORE INCOME TAXES 293.7 102.4
Impairment of El Chanate inventory   33.9
Corporate and other    
Expenses    
Exploration 1.7  
Corporate and administrative 27.6  
Share-based compensation 21.7  
EARNINGS FROM OPERATIONS (51.0)  
Operating segments | Young-Davidson    
Disclosure of operating segments [line items]    
Operating revenues 355.3 347.8
Cost of sales    
Mining and processing 166.2 163.4
Royalties 5.3 5.3
Amortization 76.7 81.8
Cost of sales 248.2 250.5
Expenses    
Exploration 2.9 4.3
EARNINGS FROM OPERATIONS 104.2 93.0
Impairment of El Chanate inventory   0.0
Operating segments | Mulatos1    
Disclosure of operating segments [line items]    
Operating revenues 420.2 238.1
Cost of sales    
Mining and processing 188.4 150.4
Royalties 2.2 1.2
Amortization 75.3 52.5
Cost of sales 265.9 238.0
Expenses    
Exploration 9.9 7.5
EARNINGS FROM OPERATIONS 144.4 (7.4)
Impairment of El Chanate inventory   33.9
Operating segments | Island Gold    
Disclosure of operating segments [line items]    
Operating revenues 247.8 235.3
Cost of sales    
Mining and processing 82.7 80.6
Royalties 2.7 2.6
Amortization 38.2 37.2
Cost of sales 123.6 120.4
Expenses    
Exploration 3.7 4.7
EARNINGS FROM OPERATIONS $ 120.5 110.2
Impairment of El Chanate inventory   0.0
Operating segments | Corporate and other    
Expenses    
Exploration   1.9
Corporate and administrative   25.9
Share-based compensation   18.3
Impairment (note 8)   38.2
EARNINGS FROM OPERATIONS   $ (84.3)