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Share-based payments - Outstanding Stock Options (Details)
 12 Months Ended
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Share-based Payment Arrangements [Abstract]    
Outstanding, beginning balance (in shares) | shares 15,650,234 12,825,541
Granted (in shares) | shares 0 3,420,407
Exercised (in shares) | shares (4,603,861) (506,828)
Forfeited or expired (in shares) | shares (267,649) (88,886)
Outstanding, ending balance (in shares) | shares 10,778,724 15,650,234
Exercisable (in shares) | shares 4,316,424 5,186,600
Weighted average exercise price of share options outstanding, beginning balance (CAD per share) | $ / shares $ 59 $ 57
Weighted average exercise price of share options granted (CAD per share) | $ / shares 0 65
Weighted average exercise price of share options exercised (CAD per share) | $ / shares 57 52
Weighted average exercise price of share options forfeited or expired (CAD per share) | $ / shares 60 61
Weighted average exercise price of share options exercisable (CAD per share) | $ / shares 58 58
Weighted average share price, share options exercised (CAD per share) | $ / shares $ 64 $ 63