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Share-based compensation - Disclosure of deferred and restricted share units - Osisko Development Corp (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
DSU [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period 408,564 325,207
Number of units, granted 64,720 97,995
Number of units reinvested dividends 5,185 5,558
Number of units, settled (102,266) (20,196)
Number of units, forfeited 0 0
Number of units, end of period 376,203 408,564
Number of units, vested 311,010 309,862
DSU [Member] | Osisko Development Corp [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period 170,620 0
Number of Replacement restricted stock units granted 0 0
Number of units, granted 68,730 170,620
Number of units, forfeited 0 0
Number of units, end of period 239,350 170,620
Number of units, vested 0 0
RSU [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period 1,242,902 1,190,038
Number of units, granted 293,610 504,560
Number of units reinvested dividends 15,102 17,143
Number of units, settled (398,173) (365,399)
Number of units, forfeited (275,044) (103,440)
Number of units, end of period 878,397 1,242,902
Number of units, vested 0 0
RSU [Member] | Osisko Development Corp [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period 0 0
Number of Replacement restricted stock units granted 458,450 0
Number of units, granted 599,000 0
Number of units, forfeited (21,270) 0
Number of units, end of period 1,036,180 0
Number of units, vested 0 0