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SEGMENTED INFORMATION - Geographic segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Segmented Information |  |
Metal sales | $ 3,497.3 | $ 3,212.6
Property, plant and equipment | 6,340.0 | 5,519.1
United States |  |
Segmented Information |  |
Metal sales | 1,031.0 | 1,214.4
Property, plant and equipment | 1,765.0 | 1,315.6
Russian Federation |  |
Segmented Information |  |
Metal sales | 734.4 | 627.7
Property, plant and equipment | 337.4 | 423.9
Brazil |  |
Segmented Information |  |
Metal sales | 856.3 | 663.1
Property, plant and equipment | 1,749.3 | 1,585.5
Chile |  |
Segmented Information |  |
Metal sales | 61.2 | 113.6
Property, plant and equipment | 394.1 | 358.2
Mauritania |  |
Segmented Information |  |
Metal sales | 532.8 | 307.8
Property, plant and equipment | 1,932.4 | 1,594.8
Ghana |  |
Segmented Information |  |
Metal sales | 281.6 | 286.0
Property, plant and equipment | $ 161.8 | $ 241.1

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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 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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