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Commitments - Disclosure of detailed information about significant commitments for streams and offtakes (Details) | 12 Months Ended
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Dec. 31, 2019
Amulsar stream [Member] |
Disclosure Of Commitments [Line Items] |
Term of agreement | 40 years
Amulsar Offtake [Member] |
Disclosure Of Commitments [Line Items] |
Term of agreement | Until delivery of 2,110,425 ounces Au
Back Forty stream [Member] |
Disclosure Of Commitments [Line Items] |
Term of agreement | Life of mine
Mantos Blancos stream [Member] |
Disclosure Of Commitments [Line Items] |
Term of agreement | Life of mine
Renard stream [Member] |
Disclosure Of Commitments [Line Items] |
Term of agreement | 40 years
Sasa stream [Member] |
Disclosure Of Commitments [Line Items] |
Term of agreement | 40 years
Gibraltar stream [Member] |
Disclosure Of Commitments [Line Items] |
Per ounce/carat price | 2.75
Term of agreement | Life of mine
Gold Metal Member | Amulsar stream [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 4.22%
Per ounce/carat price | 400
Gold Metal Member | Amulsar Offtake [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 81.91%
Per ounce/carat price | Based on quotational period
Gold Metal Member | Back Forty stream [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 18.50%
Per ounce/carat price | 30% spot price (max $600)
Silver [Member] | Amulsar stream [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 62.50%
Per ounce/carat price | 4
Silver [Member] | Back Forty stream [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 75.00%
Per ounce/carat price | 4
Silver [Member] | Mantos Blancos stream [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 100.00%
Per ounce/carat price | 8% spot
Silver [Member] | Sasa stream [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 100.00%
Per ounce/carat price | 5
Silver [Member] | Gibraltar stream [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 75.00%
Per ounce/carat price | 2.75
Diamond [Member] | Renard stream [Member] |
Disclosure Of Commitments [Line Items] |
Attributable payable production to be purchased, percentage | 9.60%
Per ounce/carat price | Lesser of 40% of sales price or $40

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- Definition Attributable payable production to be purchased, percentage + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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_
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- Definition Per ounce/carat price + 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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- Definition Term of agreement + References No definition available. + Details
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Namespace Prefix: | or_
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Balance Type: | na
Period Type: | duration

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

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

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

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

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

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

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

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- Details
Name: | or_CategoriesOfResourcesAxis=or_GoldMetalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | or_CategoriesOfResourcesAxis=or_SilverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | or_CategoriesOfResourcesAxis=or_DiamondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |