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Commitments - Disclosure of detailed information about acquisition of royalties and streams (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
Aquila Resources Inc [Member] | Back Forty Project [Member] | First Installments [Member] |  |
Disclosure Of Commitments [Line Items] |  |
Installments |  | $ 10
Triggering Events | Positive construction decision. | Positive construction decision.
Aquila Resources Inc [Member] | Back Forty Project [Member] | Second Installments [Member] |  |
Disclosure Of Commitments [Line Items] |  |
Installments |  | $ 30
Triggering Events | First drawdown on debt finance facility. | First drawdown on debt finance facility.
Falco [Member] | Home 5 [Member] | First Installments [Member] |  |
Disclosure Of Commitments [Line Items] |  |
Installments | $ 20 |
Triggering Events | Receipt of all necessary material third-party approvals, licenses, rights of way and surface rights on the property. | Receipt of all necessary material third-party approvals, licenses, rights of way and surface rights on the property.
Falco [Member] | Home 5 [Member] | Second Installments [Member] |  |
Disclosure Of Commitments [Line Items] |  |
Installments | $ 35 |
Triggering Events | Receipt of all material construction permits, positive construction decision, and raising a minimum of $100.0 million in non-debt financing. | Receipt of all material construction permits, positive construction decision, and raising a minimum of $100.0 million in non-debt financing.
Falco [Member] | Home 5 [Member] | Third Installments [Member] |  |
Disclosure Of Commitments [Line Items] |  |
Installments | $ 60 |
Triggering Events | Upon total projected capital expenditure having been demonstrated to be financed. | Upon total projected capital expenditure having been demonstrated to be financed.
Falco [Member] | Home 5 [Member] | Four Installments [Member] |  |
Disclosure Of Commitments [Line Items] |  |
Installments | $ 40 |
Triggering Events | Payable with fourth installment, at sole election of Osisko, to increase the silver stream to 100% of payable silver (from 90%). | Payable with fourth installment, at sole election of Osisko, to increase the silver stream to 100% of payable silver (from 90%).

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