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v3.20.1

Other investments (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 CAD ($)
Other Investment Abstract |
Non-cash transaction, simultaneous disposal and acquisition of investment | $ 5.7

X
- Definition Represents amount of about non-cash transaction, simultaneous disposal and acquisition of investment. + References No definition available. + Details
Name: | or_NonCashTransactionSimultaneousDisposalAndAcquisitionOfInvestment
Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | or_OtherInvestmentAbstract
Namespace Prefix: | or_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration