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Share-based payment arrangements - Summary of movements in number of share options outstanding and weighted average exercise prices (Details)
 12 Months Ended
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Weighted average price CDN$    
Beginning balance (in dollars per share) | $ / shares $ 11.31 $ 11.31
Granted (in dollars per share) | $ / shares 14.74 13.92
Exercised (in dollars per share) | $ / shares 10.11 6.42
Expired (in dollars per share) | $ / shares 12.76 21.98
Forfeited (in dollars per share) | $ / shares 14.06 13.67
Ending balance (in dollars per share) | $ / shares $ 12.42 $ 11.31
Number of options    
Beginning balance (in shares) | shares 3,739,567 4,250,763
Granted (in shares) | shares 1,054,431 1,265,672
Exercised (in shares) | shares (987,649) (885,750)
Expired (in shares) | shares (127,132) (667,980)
Forfeited (in shares) | shares (326,474) (223,138)
Ending balance (in shares) | shares 3,352,743 3,739,567