v3.25.2

Share-based compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
Disclosure of terms and conditions of share-based payment arrangement [Abstract] |
Disclosure of number and weighted average exercise prices of share options [Table Text Block] |
|  | 2025 |  |  | 2024 |
|  |  |  |  | Weighted |  |  |  |  |  | Weighted |
|  | Number of |  |  | average |  |  | Number of |  |  | average |
|  | options |  |  | exercise price |  |  | options |  |  | exercise price |
|  |  |  |  | C$ |  |  |  |  |  | C$ |
Balance - January 1 |  | 2,452,542 |  |  | 15.41 |  |  | 3,122,006 |  |  | 14.50 |
Granted |  | - |  |  | - |  |  | 287,300 |  |  | 18.72 |
Exercised |  | (1,123,809 | ) |  | 14.37 |  |  | (956,758 | ) |  | 13.44 |
Forfeited / Cancelled |  | (14,166 | ) |  | 18.43 |  |  | - |  |  | - |
Expired |  | - |  |  | - |  |  | (6 | ) |  | 13.93 |
Balance - December 31 |  | 1,314,567 |  |  | 16.26 |  |  | 2,452,542 |  |  | 15.41 |
Options exercisable - December 31 |  | 987,766 |  |  | 15.54 |  |  | 1,703,943 |  |  | 14.51 |
Disclosure of range of exercise prices of outstanding share options [Table Text Block] |
|  |  | Options outstanding |  |  | Options exercisable |
|  |  |  |  |  |  |  |  | Weighted |  |  |  |  |  |
|  |  |  |  |  |  | average |  |  |  |  |  |
|  |  |  | Weighted |  |  | remaining |  |  |  |  |  | Weighted |
Exercise |  |  | Number of |  |  | average |  |  | contractual |  |  | Number of |  |  | average |
price range |  |  | options |  |  | exercise price |  |  | life (years) |  |  | options |  |  | exercise price |
C$ |  |  |  |  |  | C$ |  |  |  |  |  |  |  |  | C$ |
12.70 - 14.50 |  |  | 574,801 |  |  | 13.55 |  |  | 0.9 |  |  | 574,801 |  |  | 13.55 |
15.97 - 22.20 |  |  | 739,766 |  |  | 18.36 |  |  | 3.0 |  |  | 412,965 |  |  | 18.31 |
|  |  | 1,314,567 |  |  | 16.26 |  |  | 2.0 |  |  | 987,766 |  |  | 15.54 |
Disclosure of deferred and restricted share units [Table Text Block] |
|  | 2025 |  | 2024 |
|  | DSUs (i) |  |  | RSUs (ii) |  |  | DSUs (i) |  |  | RSUs (ii) |
Balance - January 1 |  | 435,505 |  |  | 742,202 |  |  | 414,278 |  |  | 717,105 |
Granted |  | 35,310 |  |  | 342,340 |  |  | 70,440 |  |  | 308,000 |
Reinvested dividends |  | 3,056 |  |  | 6,608 |  |  | 4,578 |  |  | 8,247 |
Settled |  | (141,570 | ) |  | (301,155 | ) |  | (42,095 | ) |  | (272,160 | )
Forfeited |  | - |  |  | - |  |  | (11,696 | ) |  | (18,990 | )
Balance - December 31 |  | 332,301 |  |  | 789,995 |  |  | 435,505 |  |  | 742,202 |
Balance - Vested |  | 296,872 |  |  | - |  |  | 381,246 |  |  | - |

X
- Definition The disclosure of the number and weighted average exercise prices of share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of the range of exercise prices for outstanding share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_d&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Disclosure of deferred and restricted share units explanatory + References No definition available. + Details
Name: | or_DisclosureOfDeferredAndRestrictedShareUnitsExplanatory
Namespace Prefix: | or_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration