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Income taxes - Deductible Temporary Difference and Unused Tax Credits (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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 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 + Details
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