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Share-based payments - Outstanding Stock Options (Details)
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Share-based Payment Arrangements [Abstract]    
Outstanding, beginning balance (in shares) | shares 12,825,541 14,072,332
Granted (in shares) | shares 3,420,407 3,357,303
Exercised (in shares) | shares (506,828) (4,459,559)
Forfeited or expired (in shares) | shares (88,886) (144,535)
Outstanding, ending balance (in shares) | shares 15,650,234 12,825,541
Exercisable (in shares) | shares 5,186,600 2,786,043
Weighted average exercise price of share options outstanding, beginning balance (CAD per share) | $ / shares $ 57 $ 56
Weighted average exercise price of share options granted (CAD per share) | $ / shares 65 58
Weighted average exercise price of share options exercised (CAD per share) | $ / shares 52 54
Weighted average exercise price of share options forfeited or expired (CAD per share) | $ / shares 61 58
Weighted average exercise price of share options exercisable (CAD per share) | $ / shares 58 56
Weighted average share price, share options exercised (CAD per share) | $ / shares $ 63 $ 62