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Income taxes - Deductible Temporary Difference and Unused Tax Credits (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
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

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.

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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

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