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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

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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