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Share-based payments - Outstanding Stock Options (Details)
 12 Months Ended
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Share-based Payment Arrangements [Abstract]    
Outstanding, beginning balance (in shares) | shares 10,778,724 15,650,234
Exercised (in shares) | shares (2,952,992) (4,603,861)
Forfeited or expired (in shares) | shares (23,624) (267,649)
Outstanding, ending balance (in shares) | shares 7,802,108 10,778,724
Exercisable (in shares) | shares 4,539,188 4,316,424
Weighted average exercise price of share options outstanding, beginning balance (in cad per share) | $ / shares $ 60 $ 59
Weighted average exercise price of share options exercised (in cad per share) | $ / shares 58 57
Weighted average exercise price of share options forfeited or expired (in cad per share) | $ / shares 65 60
Weighted average exercise price of share options exercisable (in cad per share) | $ / shares 58 58
Weighted average share price, share options exercised (in cad per share) | $ / shares $ 69 $ 64