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Sales of goods (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods, related party transactions | $ 2,900.0 | $ 3,000.0 | $ 2,300.0
Increase decrease in revenue from sale of copper through adjustments arising from change in provisional price | $ 88.8 | $ 1.3 |

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- Definition The increase (decrease) in revenue from sale of copper through adjustments arising from change in provisional price. + References No definition available. + Details
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- Definition The amount of revenue arising from the sale of goods in related party transactions. [Refer: Revenue; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_21_a&doctype=Standard -URIDate 2018-03-16 + Details
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