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Share-Based Payments - Activities in Stock Option Plans (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Number of stock options (thousands)    
Beginning balance (in shares) | shares 3,589 3,042
Granted (in shares) | shares 790 709
Exercised (in shares) | shares (951) (115)
Forfeited (in shares) | shares 0 (47)
Ending balance (in shares) | shares 3,428 3,589
Exercisable, December 31 (in shares) | shares 1,560 1,785
Weighted average exercise price    
Beginning balance (in CAD per share) | $ / shares $ 58.51 $ 55.85
Granted (in CAD per share) | $ / shares 67.68 68.12
Exercised (in CAD per share) | $ / shares 51.60 45.94
Forfeited (in CAD per share) | $ / shares 0 62.38
Ending balance (in CAD per share) | $ / shares 62.54 58.51
Exercisable, December 31 (in CAD per share) | $ / shares $ 57.89 $ 53.33