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Segmented information - Schedule of segment information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
OPERATING SEGMENT RESULTS    
Gold revenues $ 707.7 $ 612.7
Copper revenues 198.5 160.3
Silver revenues 18.3 13.5
Total revenues 924.5 786.5
Operating expenses 436.3 450.4
Depreciation and depletion 247.5 234.2
Revenue less cost of goods sold 240.7 101.9
Corporate administration 24.9 24.5
Share-based payment expenses 13.7 5.4
Exploration and business development 19.8 10.2
Earnings from operations 182.3 61.8
Finance income 6.9 7.5
Finance costs (17.1) (13.2)
Other losses 88.9 115.3
Earnings (loss) before taxes 83.2 (59.2)
BC Exploration tax credit received 3.2  
Other    
OPERATING SEGMENT RESULTS    
Gold revenues 0.0 0.0
Copper revenues 0.0 0.0
Silver revenues 0.0 0.0
Total revenues 0.0 0.0
Operating expenses 0.0 0.0
Depreciation and depletion 0.0 0.0
Revenue less cost of goods sold 0.0 0.0
Corporate administration 24.9 24.5
Share-based payment expenses 13.7 5.4
Exploration and business development (2.0) 0.8
Earnings from operations (36.6) (30.7)
Intersegment amounts    
OPERATING SEGMENT RESULTS    
Total revenues 0.0 0.0
Rainy River | Operating segments    
OPERATING SEGMENT RESULTS    
Gold revenues 551.1 494.3
Copper revenues 0.0 0.0
Silver revenues 14.7 11.1
Total revenues 565.8 505.4
Operating expenses 275.6 284.7
Depreciation and depletion 175.4 166.9
Revenue less cost of goods sold 114.8 53.8
Corporate administration 0.0 0.0
Share-based payment expenses 0.0 0.0
Exploration and business development 9.1 0.2
Earnings from operations 105.7 53.6
New Afton | Operating segments    
OPERATING SEGMENT RESULTS    
Gold revenues 156.6 118.4
Copper revenues 198.5 160.3
Silver revenues 3.6 2.4
Total revenues 358.7 281.1
Operating expenses 160.7 165.7
Depreciation and depletion 72.1 67.3
Revenue less cost of goods sold 125.9 48.1
Corporate administration 0.0 0.0
Share-based payment expenses 0.0 0.0
Exploration and business development 12.7 9.2
Earnings from operations $ 113.2 $ 38.9