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Share-based compensation - Disclosure of deferred and restricted share units (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
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