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SEGMENTED INFORMATION - Geographic segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Segmented Information    
Metal sales $ 3,212.6 $ 3,303.0
Property, plant and equipment 5,519.1 4,887.2
United States    
Segmented Information    
Metal sales 1,214.4 1,461.1
Property, plant and equipment 1,315.6 1,067.4
Russian Federation    
Segmented Information    
Metal sales 627.7 726.9
Property, plant and equipment 423.9 482.3
Brazil    
Segmented Information    
Metal sales 663.1 447.0
Property, plant and equipment 1,585.5 1,383.1
Chile    
Segmented Information    
Metal sales 113.6 52.0
Property, plant and equipment 358.2 308.8
Mauritania    
Segmented Information    
Metal sales 307.8 298.4
Property, plant and equipment 1,594.8 1,302.1
Ghana    
Segmented Information    
Metal sales 286.0 317.6
Property, plant and equipment $ 241.1 $ 343.5