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Cash - Disclosure of detailed information about cash position (Details) $ in Thousands, $ in Thousands | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($)
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Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | $ 115,698 |  | $ 302,524 |  | $ 108,223
Osisko Gold Royalties [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | 82,291 |  | 105,097 |  |
Osisko Development Corp [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | 33,407 |  | 197,427 |  |
Cash held in Canadian dollars [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | 53,485 |  | 167,088 |  |
Cash held in Canadian dollars [Member] | Osisko Gold Royalties [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | 40,121 |  | 29,714 |  |
Cash held in Canadian dollars [Member] | Osisko Development Corp [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | 13,364 |  | 137,374 |  |
Cash held in U.S. dollars [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | 62,213 | $ 49,072 | 135,436 | $ 106,375 |
Cash held in U.S. dollars [Member] | Osisko Gold Royalties [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | 42,170 | 33,262 | 75,383 | 59,208 |
Cash held in U.S. dollars [Member] | Osisko Development Corp [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | $ 20,043 | $ 15,810 | $ 60,053 | $ 47,167 |

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- Definition The amount of cash on hand and demand deposits. [Refer: Cash on hand] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
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Namespace Prefix: | or_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | or_SubsidiaryEntitiesAxis=or_OsiskoDevelopmentCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | or_ComponentsOfCashAndCashEquivalentsAxis=or_CashHeldInCadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | or_ComponentsOfCashAndCashEquivalentsAxis=or_CashHeldInUSDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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