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Royalty, stream and other interests (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2021
CAD ($)
Royalties
Apr. 30, 2021
USD ($)
Royalties
Mar. 31, 2020
CAD ($)
Dec. 31, 2021
CAD ($)
Royalties
Rate
Dec. 31, 2021
USD ($)
Royalties
Rate
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Royalty, Stream And Other Interests [Line Items]              
Number of royalties acquired | Royalties 6 6          
Investments in royalty, payment $ 32.6 $ 26,000,000          
Long term gold price per ounce   $ 700          
Spring Valley Project [Member]              
Royalty, Stream And Other Interests [Line Items]              
Number of royalties acquired | Royalties       4 4    
Percentage of NSR acquired | Rate       0.50% 0.50%    
Spring Valley Project [Member] | Minimum [Member]              
Royalty, Stream And Other Interests [Line Items]              
Percentage of NSR acquired | Rate       2.50% 2.50%    
Spring Valley Project [Member] | Maximum [Member]              
Royalty, Stream And Other Interests [Line Items]              
Percentage of NSR acquired | Rate       3.00% 3.00%    
Moonlight exploration property [Member]              
Royalty, Stream And Other Interests [Line Items]              
Percentage of NSR acquired | Rate       1.00% 1.00%    
Almaden project [Member]              
Royalty, Stream And Other Interests [Line Items]              
Percentage of NSR acquired | Rate       0.50% 0.50%    
Gold and silver offtake right acquired | Rate       30.00% 30.00%    
Pine Point zinc project [Member]              
Royalty, Stream And Other Interests [Line Items]              
Investments in royalty, payment           $ 13.0  
Percentage of NSR acquired           2.00% 2.00%
Sailfish Royalty Corp.[Member] | Tocantinzinho Gold Project [Member]              
Royalty, Stream And Other Interests [Line Items]              
Investments in royalty, payment       $ 12.6 $ 10,000,000    
Percentage of NSR acquired | Rate       2.75% 2.75%    
Net smelter return after first 1% buy-down | Rate       1.75% 1.75%    
Buy-down payment option to reduce royalty percentage         $ 5,500,000    
Royalty percentage decrease under buy-down payment option | Rate       2.00% 2.00%    
Royalty interest after buy-down payment option | Rate       0.75% 0.75%    
Buy-down exercised early | Rate       1.00% 1.00%    
Falco [Member]              
Royalty, Stream And Other Interests [Line Items]              
Additional investments in royalty, stream and other interests       $ 10.0      
Amount of second installment payment       $ 20.0      
Barrick TZ Limited [Member] | AfriOre and Gold Rim [Member]              
Royalty, Stream And Other Interests [Line Items]              
Investments in royalty, payment         $ 11,800,000    
Percentage of NSR acquired | Rate       2.00% 2.00%    
Barrick TZ Limited [Member] | Frontier project [Member]              
Royalty, Stream And Other Interests [Line Items]              
Percentage of NSR acquired | Rate       1.00% 1.00%    
Barrick TZ Limited [Member] | Central Hounde project [Member]              
Royalty, Stream And Other Interests [Line Items]              
Percentage of NSR acquired | Rate       1.00% 1.00%    
Caisse de depot et placement du Quebec [Member] | Teck Resources Portfolio [Member]              
Royalty, Stream And Other Interests [Line Items]              
Investments in royalty, payment           $ 12.5  
Percentage of portfolio acquired           15.00% 15.00%
Regulus Resources Inc [Member] | Antakori Project [Member]              
Royalty, Stream And Other Interests [Line Items]              
Investments in royalty, payment           $ 16.4 $ 12,500,000
Regulus' percentage of ownership over the AntaKori project and other claims           100.00% 100.00%
Description of royalty acquired           Regulus has acquired a royalty on the Mina Volare claim of the AntaKori project which represents a 1.5% or 3% NSR depending on location, from a private vendor. As per its right under the partnership, Osisko has elected to acquire 50% of the royalty for 75% of Regulus' purchase price with Osisko's acquisition cost for the royalty included in the Upfront Payment. Regulus has cancelled the remaining 50% of the royalty. As such, the royalty on the Mina Volare claim is now reduced to 0.75% or 1.5% depending on location, in favour of Osisko. Regulus has acquired a royalty on the Mina Volare claim of the AntaKori project which represents a 1.5% or 3% NSR depending on location, from a private vendor. As per its right under the partnership, Osisko has elected to acquire 50% of the royalty for 75% of Regulus' purchase price with Osisko's acquisition cost for the royalty included in the Upfront Payment. Regulus has cancelled the remaining 50% of the royalty. As such, the royalty on the Mina Volare claim is now reduced to 0.75% or 1.5% depending on location, in favour of Osisko.
Stornoway Diamond Corporation [Member] | Renard diamond stream [Member]              
Royalty, Stream And Other Interests [Line Items]              
Impairment of royalty, stream and other interests     $ 26.3        
Impairment of royalty, stream and other interests, net of tax     $ 19.3        
Estimated recoverable amount           $ 40.0  
Additional impairment if the diamond price was 10% lower than estimate           4.1  
Additional impairment if the diamond price was 10% lower than estimate, net of income tax           3.0  
Additional impairment if the post-tax basis discount rate was 100 basis points higher           1.9  
Additional impairment if the post-tax basis discount rate was 100 basis points higher, net of income tax           $ 1.4  
Reasonable increase decrease in estimates for sensitivity analysis           10.00% 10.00%
Additional impairment if the restart scenarios was 10% more negative than management estimate           $ 5.5  
Additional impairment if the restart scenarios was 10% more negative than management estimate, net of income taxes           $ 4.0  
GoGold Resources Inc [Member]              
Royalty, Stream And Other Interests [Line Items]              
Percentage of gold and silver from tailings piles | Rate       2.40% 2.40%    
Percentage of transfer price of gold and silver spot prices | Rate       30.00% 30.00%    
Gibraltar Copper Mine [Member] | Taseko [Member]              
Royalty, Stream And Other Interests [Line Items]              
Reduced price paid by Osisko for each ounce of refined silver           from US$2.75 to nil from US$2.75 to nil
Investments in royalty, payment           $ 8.5