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Income taxes - Deductible Temporary Difference, losses and Unused Tax Credits (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference and unused tax credits
Unused tax credits for which no deferred tax asset recognised	$ 48.7	$ 72.7
Royalty, stream and working interests
Disclosure of temporary difference and unused tax credits
Unused tax credits for which no deferred tax asset recognised	25.1	48.0
Tax losses (expiry dates - 2029-2033)
Disclosure of temporary difference and unused tax credits
Unused tax credits for which no deferred tax asset recognised	$ 23.6	$ 24.7

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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 2020-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2020-01-01

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