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Share-Based Payments - Activities in Stock Option Plans (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Number of stock options (thousands)    
Beginning balance (in shares) | shares 3,101 3,008
Granted (in shares) | shares 745 517
Exercised (in shares) | shares (772) (399)
Forfeited (in shares) | shares 0 (25)
Ending balance (in shares) | shares 3,074 3,101
Exercisable, December 31 (in shares) | shares 1,670 2,041
Weighted average exercise price    
Beginning balance (in CAD per share) | $ / shares $ 37.06 $ 33.88
Granted (in CAD per share) | $ / shares 50.58 53.96
Exercised (in CAD per share) | $ / shares 29.01 34.57
Forfeited (in CAD per share) | $ / shares (0.00) 43.79
Ending balance (in CAD per share) | $ / shares 42.36 37.06
Exercisable, December 31 (in CAD per share) | $ / shares $ 35.51 $ 30.97