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Share-based compensation - Disclosure of deferred and restricted share units (Details) - shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
DSU [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period 376,203 408,564
Number of units, granted 78,200 64,720
Number of units reinvested dividends 6,018 5,185
Number of units, settled (30,846) (102,266)
Number of units, forfeited 0 0
Number of units, end of period 429,575 376,203
Number of units, vested 350,822 311,010
RSU [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period 878,397 1,242,902
Number of units, granted 275,520 293,610
Number of units reinvested dividends 13,483 15,102
Number of units, settled (278,806) (398,173)
Number of units, forfeited (35,791) (275,044)
Number of units, end of period 852,803 878,397
Number of units, vested 0 0