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Segmented information - Schedule of segment information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
OPERATING SEGMENT RESULTS |  |  |
Gold revenues |  | $ 482,100,000 | $ 492,600,000
Copper revenues |  | 111,800,000 | 232,700,000
Silver revenues |  | 10,500,000 | 20,200,000
Total revenues |  | 604,400,000 | 745,500,000
Operating expenses |  | 382,700,000 | 377,300,000
Depreciation and depletion |  | 195,400,000 | 195,700,000
Revenue less cost of goods sold |  | 26,300,000 | 172,500,000
Corporate administration |  | 21,300,000 | 21,800,000
Corporate restructuring | $ 2,100,000 | 2,100,000 | 0
Share-based payment expenses |  | 2,600,000 | 2,200,000
Exploration and business development |  | 16,000,000.0 | 11,200,000
(Loss) income from operations |  | (15,700,000) | 137,300,000
Intersegment amounts |  |  |
OPERATING SEGMENT RESULTS |  |  |
Total revenues |  | 0 | 0
Corporate & Other |  |  |
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 |  | 21,300,000 | 21,800,000
Corporate restructuring |  | 2,100,000 |
Share-based payment expenses |  | 2,600,000 | 2,200,000
Exploration and business development |  | 500,000 | 800,000
(Loss) income from operations |  | (26,500,000) | (24,800,000)
Rainy River | Operating segments |  |  |
OPERATING SEGMENT RESULTS |  |  |
Gold revenues |  | 413,100,000 | 410,900,000
Copper revenues |  | 0 | 0
Silver revenues |  | 8,600,000 | 15,000,000.0
Total revenues |  | 421,700,000 | 425,900,000
Operating expenses |  | 230,400,000 | 226,500,000
Depreciation and depletion |  | 148,100,000 | 148,000,000.0
Revenue less cost of goods sold |  | 43,200,000 | 51,400,000
Corporate administration |  | 0 | 0
Corporate restructuring |  | 0 |
Share-based payment expenses |  | 0 | 0
Exploration and business development |  | 2,700,000 | 1,700,000
(Loss) income from operations |  | 40,500,000 | 49,700,000
New Afton | Operating segments |  |  |
OPERATING SEGMENT RESULTS |  |  |
Gold revenues |  | 69,000,000.0 | 81,700,000
Copper revenues |  | 111,800,000 | 232,700,000
Silver revenues |  | 1,900,000 | 5,200,000
Total revenues |  | 182,700,000 | 319,600,000
Operating expenses |  | 152,300,000 | 150,800,000
Depreciation and depletion |  | 47,300,000 | 47,700,000
Revenue less cost of goods sold |  | (16,900,000) | 121,100,000
Corporate administration |  | 0 | 0
Corporate restructuring |  | 0 |
Share-based payment expenses |  | 0 | 0
Exploration and business development |  | 12,800,000 | 8,700,000
(Loss) income from operations |  | $ (29,700,000) | $ 112,400,000

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