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SEGMENTED INFORMATION - Geographic segments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Segmented Information    
Metal sales $ 3,729.4 $ 4,213.4
Property, plant and equipment 7,617.7 7,653.5
United States    
Segmented Information    
Metal sales 1,292.0 1,318.9
Property, plant and equipment 1,818.5 2,043.7
Russia    
Segmented Information    
Metal sales 862.8 904.6
Property, plant and equipment 616.1 604.0
Brazil    
Segmented Information    
Metal sales 987.9 960.7
Property, plant and equipment 1,672.7 1,721.5
Chile    
Segmented Information    
Metal sales 5.0 16.1
Property, plant and equipment 779.9 653.5
Mauritania    
Segmented Information    
Metal sales 314.7 718.0
Property, plant and equipment 2,419.9 2,289.2
Ghana    
Segmented Information    
Metal sales 267.0 295.1
Property, plant and equipment $ 310.6 $ 341.6