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Segmented information - Segmented assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
SEGMENTED ASSETS AND LIABILITIES    
Capital expenditure $ 271.1 $ 265.9
Total assets 2,003.8 2,286.0
Total liabilities 951.5 1,496.8
Total capital expenditures 271.1 265.9
Other    
SEGMENTED ASSETS AND LIABILITIES    
Assets 94.8 169.5
Liabilities 443.2 431.7
Capital expenditure 0.1 0.2
Rainy River    
SEGMENTED ASSETS AND LIABILITIES    
Assets 985.9 1,015.4
Liabilities 361.1 357.1
Capital expenditure 131.1 120.6
New Afton    
SEGMENTED ASSETS AND LIABILITIES    
Assets 923.1 1,101.1
Liabilities 147.1 708.0
Capital expenditure $ 139.9 $ 145.1