v3.25.2

Nature of activities (Narrative) (Details) - Canadian Malartic Mine [Member] | 12 Months Ended
--- | ---
Dec. 31, 2025
Minimum [Member] |
Nature of activities [Line Items] |
Net smelter return | 3.00%
Maximum [Member] |
Nature of activities [Line Items] |
Net smelter return | 5.00%

X
- 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

X
- 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

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

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |