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Nature of activities (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2022
Canadian Malartic Mine [Member] |
Nature Of Activities [Line Items] |
Net smelter return | 5.00%

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

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- Definition Net smelter return + References No definition available. + Details
Name: | or_NetSmelterReturn
Namespace Prefix: | or_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | or_RoyaltyStreamAndOtherInterestsAxis=or_CanadianMalarticMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |