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Amounts receivable - Disclosure of detailed information about trade and other receivables (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Trade and other receivables [abstract] |  |
Revenues receivable from royalty, stream and other interests | $ 1,257 | $ 6,643
Interest income receivable | 2,133 | 1,991
Amounts receivable from associates | 641 | 3,225
Sales taxes, tax credits and other receivables | 2,299 | 462
Amounts receivable | $ 6,330 | $ 12,321

X
- Definition The amount of current receivables from taxes other than income tax. [Refer: Receivables from taxes other than income tax] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_CurrentReceivablesFromTaxesOtherThanIncomeTax
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of interest recognised as a receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_InterestReceivable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_h&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_TradeAndOtherCurrentReceivables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents amount of receivables from associates. + References No definition available. + Details
Name: | or_ReceivablesFromAssociates
Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of receivables arising from royalty, stream and other interests. + References No definition available. + Details
Name: | or_RevenuesReceivableFromRoyaltyStreamAndOtherInterests
Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant