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Segmented information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
OPERATING SEGMENT RESULTS    
Gold revenues $ 492,600,000 $ 449,300,000
Copper revenues 232,700,000 180,900,000
Silver revenues 20,200,000 13,200,000
Total revenues 745,500,000 643,400,000
Operating expenses 377,300,000 339,900,000
Depreciation and depletion 195,700,000 193,100,000
Revenue less cost of goods sold 172,500,000 110,400,000
Corporate administration 21,800,000 15,600,000
Share-based payment expenses 2,200,000 7,600,000
Exploration and business development 11,200,000 5,800,000
Income from operations 137,300,000 81,400,000
Intersegment amounts    
OPERATING SEGMENT RESULTS    
Total revenues 0 0
Rainy River    
OPERATING SEGMENT RESULTS    
Gold revenues 410,900,000 360,700,000
Copper revenues 0 0
Silver revenues 15,000,000.0 8,000,000.0
Total revenues 425,900,000 368,700,000
Operating expenses 226,500,000 213,200,000
Depreciation and depletion 148,000,000.0 141,300,000
Revenue less cost of goods sold 51,400,000 14,200,000
Corporate administration 0 0
Share-based payment expenses 0 0
Exploration and business development 1,700,000 1,000,000.0
Income from operations 49,700,000 13,200,000
New Afton    
OPERATING SEGMENT RESULTS    
Gold revenues 81,700,000 88,600,000
Copper revenues 232,700,000 180,900,000
Silver revenues 5,200,000 5,200,000
Total revenues 319,600,000 274,700,000
Operating expenses 150,800,000 126,700,000
Depreciation and depletion 47,700,000 51,800,000
Revenue less cost of goods sold 121,100,000 96,200,000
Corporate administration 0 0
Share-based payment expenses 0 0
Exploration and business development 8,700,000 4,500,000
Income from operations 112,400,000 91,700,000
Corporate    
OPERATING SEGMENT RESULTS    
Gold revenues 0 0
Copper revenues 0 0
Silver revenues 0 0
Total revenues 0 0
Operating expenses 0 0
Depreciation and depletion 0 0
Revenue less cost of goods sold 0 0
Corporate administration 21,800,000 15,600,000
Share-based payment expenses 2,200,000 7,600,000
Exploration and business development 800,000 300,000
Income from operations $ (24,800,000) $ (23,500,000)