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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, 2022
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Weighted average price CDN$    
Beginning balance (in dollars per share) | $ / shares $ 11.32 $ 11.56
Granted (in dollars per share) | $ / shares 13.92 13.27
Exercised (in dollars per share) | $ / shares 6.42 6.36
Expired (in dollars per share) | $ / shares 22.28 16.27
Forfeited (in dollars per share) | $ / shares 13.62 12.68
Ending balance (in dollars per share) | $ / shares $ 11.32 $ 11.32
Number of options    
Beginning balance (in shares) | shares 4,250,738 5,092,388
Granted (in shares) | shares 1,265,672 1,091,891
Exercised (in shares) | shares (885,750) (339,540)
Expired (in shares) | shares (646,583) (803,771)
Forfeited (in shares) | shares (234,847) (790,230)
Ending balance (in shares) | shares 3,749,230 4,250,738