v3.26.1
Segmented Information (Segment revenues and results) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of operating segments [line items]    
Operating revenues $ 1,808.8 $ 1,346.9
Cost of sales    
Mining and processing 572.8 518.9
Royalties 27.0 13.8
Amortization 209.7 218.4
Cost of sales 809.5 751.1
Expenses    
Exploration 26.3 26.7
Corporate and administrative 39.3 32.6
Share-based compensation 55.0 31.7
Reversal of impairment (Note 10) (218.8) (57.1)
EARNINGS FROM OPERATIONS 1,097.5 561.9
Finance income (expense) (Note 20) 6.4 (3.8)
Foreign exchange (loss) gain (5.1) 8.0
Loss on commodity derivatives (230.5) (24.2)
Other loss (9.6) (39.7)
EARNINGS BEFORE INCOME TAXES 1,089.7 502.2
Young-Davidson    
Expenses    
Reversal of impairment (Note 10) (218.8) (57.1)
Corporate/Other    
Disclosure of operating segments [line items]    
Operating revenues (45.0)  
Cost of sales    
Amortization 0.5  
Cost of sales 0.5  
Expenses    
Exploration 9.7  
Corporate and administrative 39.3  
Share-based compensation 55.0  
EARNINGS FROM OPERATIONS 69.3  
Operating segments | Young-Davidson    
Disclosure of operating segments [line items]    
Operating revenues 534.1 415.3
Cost of sales    
Mining and processing 190.8 178.4
Royalties 8.0 6.2
Amortization 71.3 77.3
Cost of sales 270.1 261.9
Expenses    
Exploration 3.4 3.0
EARNINGS FROM OPERATIONS 260.6 207.5
Operating segments | Island Gold District    
Disclosure of operating segments [line items]    
Operating revenues 833.9 444.3
Cost of sales    
Mining and processing 243.7 143.5
Royalties 14.1 5.2
Amortization 86.4 57.4
Cost of sales 344.2 206.1
Expenses    
Exploration 5.8 5.7
EARNINGS FROM OPERATIONS 483.9 232.5
Operating segments | Mulatos    
Disclosure of operating segments [line items]    
Operating revenues 485.8 487.3
Cost of sales    
Mining and processing 138.3 197.0
Royalties 4.9 2.4
Amortization 51.5 83.7
Cost of sales 194.7 283.1
Expenses    
Exploration 7.4 13.1
EARNINGS FROM OPERATIONS $ 283.7 191.1
Operating segments | Corporate/Other    
Expenses    
Exploration   4.9
Corporate and administrative   32.6
Share-based compensation   31.7
EARNINGS FROM OPERATIONS   $ (69.2)