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SEGMENTED INFORMATION - Geographic segments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
SEGMENTED INFORMATION    
Metal sales $ 5,148.8 $ 4,239.7
Property, plant and equipment 7,968.6 7,963.2
United States    
SEGMENTED INFORMATION    
Metal sales 1,857.5 1,361.9
Property, plant and equipment 1,652.9 1,668.6
Mauritania    
SEGMENTED INFORMATION    
Metal sales 1,456.5 1,200.8
Property, plant and equipment 2,313.1 2,335.1
Brazil    
SEGMENTED INFORMATION    
Metal sales 1,258.9 1,149.6
Property, plant and equipment 1,604.3 1,658.8
Canada    
SEGMENTED INFORMATION    
Property, plant and equipment 1,599.5 1,495.9
Chile    
SEGMENTED INFORMATION    
Metal sales 575.9 527.4
Property, plant and equipment $ 798.8 $ 804.8