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SEGMENTED INFORMATION - Geographic segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Segmented Information |  |
Metal sales | $ 3,303.0 | $ 3,472.0
Property, plant and equipment | 4,887.2 | 4,917.6
United States |  |
Segmented Information |  |
Metal sales | 1,461.1 | 1,267.3
Property, plant and equipment | 1,067.4 | 1,002.1
Russian Federation |  |
Segmented Information |  |
Metal sales | 726.9 | 919.2
Property, plant and equipment | 482.3 | 630.8
Brazil |  |
Segmented Information |  |
Metal sales | 447.0 | 599.6
Property, plant and equipment | 1,383.1 | 1,647.5
Chile |  |
Segmented Information |  |
Metal sales | 52.0 | 219.4
Property, plant and equipment | 308.8 | 306.6
Mauritania |  |
Segmented Information |  |
Metal sales | 298.4 | 208.0
Property, plant and equipment | 1,302.1 | 832.5
Ghana |  |
Segmented Information |  |
Metal sales | 317.6 | 258.5
Property, plant and equipment | $ 343.5 | 427.9
Canada |  |
Segmented Information |  |
Property, plant and equipment |  | $ 70.2

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