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Spin-out transaction of the mining activities (Narrative) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
CAD ($)
share
shares
$ / shares
Barolo Ventures Corp [Member] | RTO Financing [Member]    
Disclosure of Spin-out transaction of the mining activities [Line Items]    
Transaction costs related to the RTO transaction | $   $ 1.3
Osisko Development Corp [Member]    
Disclosure of Spin-out transaction of the mining activities [Line Items]    
Ownership interest 75.10% 84.10%
Osisko Development Corp [Member] | Cariboo gold project And Bonanza Ledge II gold project [Member]    
Disclosure of Spin-out transaction of the mining activities [Line Items]    
Net smelter return   5.00%
Osisko Development Corp [Member] | San Antonio gold project [Member]    
Disclosure of Spin-out transaction of the mining activities [Line Items]    
Percentage of gold and silver stream   15.00%
Osisko Development Corp [Member] | James Bay and Guerrero exploration properties [Member]    
Disclosure of Spin-out transaction of the mining activities [Line Items]    
Net smelter return   3.00%
Osisko Development Corp [Member] | RTO Financing [Member]    
Disclosure of Spin-out transaction of the mining activities [Line Items]    
Number of shares issued | shares   13,350,000
Subscription price per share | $ / shares   $ 7.50
Proceeds from issuing other equity instruments | $   $ 100.1
Number of instrument converted into common shares | shares   13,350,000
Number of instrument converted into common shares purchase warrants | shares   6,675,000
Exercise price of warrants granted | $ / shares   $ 10
Transaction costs related to the RTO transaction including underwriters commission | $   $ 3.0
Number of shares of subsidiary held | shares   100,000,100
Ownership interest   88.00%
Osisko Development Corp [Member] | Brokered private placement [Member]    
Disclosure of Spin-out transaction of the mining activities [Line Items]    
Number of shares issued | share   5,367,050
Subscription price per share | $ / shares   $ 7.50
Proceeds from issuing other equity instruments | $   $ 40.2
Exercise price of warrants granted | $ / shares   $ 10.00
Number of shares of subsidiary held | shares   100,000,100
Ownership interest   84.10%
Transaction costs related to brokered private placement including underwriters commission | $   $ 2.1