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Income taxes - Deductible Temporary Difference and Unused Tax Credits (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of temporary difference and unused tax credits
Unused tax credits for which no deferred tax asset recognised	$ 75.7	$ 4.0
Mineral Interests
Disclosure of temporary difference and unused tax credits
Unused tax credits for which no deferred tax asset recognised	50.9
Tax loss
Disclosure of temporary difference and unused tax credits
Unused tax credits for which no deferred tax asset recognised	$ 24.8	$ 4.0

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

+ Details

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- Definition

The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_e&doctype=Standard
-URIDate 2018-03-16

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