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Income taxes - Deductible Temporary Difference and Unused Tax Credits (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of temporary difference and unused tax credits |  |
Unused tax credits for which no deferred tax asset recognised | $ 72.7 | $ 75.7
Royalty stream and working interests |  |
Disclosure of temporary difference and unused tax credits |  |
Unused tax credits for which no deferred tax asset recognised | 48.0 | 50.9
Tax loss (expiry dates - 2028-2039) |  |
Disclosure of temporary difference and unused tax credits |  |
Unused tax credits for which no deferred tax asset recognised | $ 24.7 | $ 24.8

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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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + Details
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