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Sales of goods (Details Textual) - USD ($) $ in Millions	12 Months Ended
	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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- References

No definition available.

+ Details

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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
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