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Segmented Information (Segment revenues and results) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]    
Operating revenues $ 1,346.9 $ 1,023.3
Cost of sales    
Mining and processing 518.9 437.3
Royalties 13.8 10.2
Amortization 218.4 190.2
Cost of sales 751.1 637.7
Expenses    
Exploration 26.7 18.2
Corporate and administrative 32.6 27.6
Share-based compensation 31.7 21.7
Reversal of impairment (Note 9) (57.1) 0.0
EARNINGS FROM OPERATIONS 561.9 318.1
Finance expense (Note 19) (3.8) (2.5)
Foreign exchange gain 8.0 1.9
Unrealized loss on commodity derivatives (24.2) (0.9)
Other loss (39.7) (22.9)
EARNINGS BEFORE INCOME TAXES 502.2 293.7
Young-Davidson    
Expenses    
Reversal of impairment (Note 9) (57.1)  
Corporate/Other    
Expenses    
Exploration 4.9  
Corporate and administrative 32.6  
Share-based compensation 31.7  
EARNINGS FROM OPERATIONS (69.2)  
Operating segments | Young-Davidson    
Disclosure of operating segments [line items]    
Operating revenues 415.3 355.3
Cost of sales    
Mining and processing 178.4 166.2
Royalties 6.2 5.3
Amortization 77.3 76.7
Cost of sales 261.9 248.2
Expenses    
Exploration 3.0 2.9
EARNINGS FROM OPERATIONS 207.5 104.2
Operating segments | Island Gold    
Disclosure of operating segments [line items]    
Operating revenues 363.1 247.8
Cost of sales    
Mining and processing 87.7 82.7
Royalties 3.2 2.7
Amortization 41.3 38.2
Cost of sales 132.2 123.6
Expenses    
Exploration 5.0 3.7
EARNINGS FROM OPERATIONS 225.9 120.5
Operating segments | Magino    
Disclosure of operating segments [line items]    
Operating revenues 81.2  
Cost of sales    
Mining and processing 55.8  
Royalties 2.0  
Amortization 16.1  
Cost of sales 73.9  
Expenses    
Exploration 0.7  
EARNINGS FROM OPERATIONS 6.6  
Operating segments | Mulatos    
Disclosure of operating segments [line items]    
Operating revenues 487.3 420.2
Cost of sales    
Mining and processing 197.0 188.4
Royalties 2.4 2.2
Amortization 83.7 75.3
Cost of sales 283.1 265.9
Expenses    
Exploration 13.1 9.9
EARNINGS FROM OPERATIONS $ 191.1 144.4
Operating segments | Corporate/Other    
Expenses    
Exploration   1.7
Corporate and administrative   27.6
Share-based compensation   21.7
EARNINGS FROM OPERATIONS   $ (51.0)