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Commitments - Disclosure of detailed information about acquisition of royalties and streams (Details)
$ in Millions, $ in Millions
 12 Months Ended
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%).