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Share-Based Payments - Activities in Stock Option Plans (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Number of stock options (thousands)    
Beginning balance (in shares) | shares 3,008 3,397
Granted (in shares) | shares 517 369
Exercised (in shares) | shares (399) (437)
Forfeited (in shares) | shares (25) (4)
Expired (in shares) | shares 0 (317)
Ending balance (in shares) | shares 3,101 3,008
Weighted average exercise price    
Weighted average exercise price, beginning balance (in CAD per share) | $ $ 33.88 $ 34.19
Weighted average exercise price, granted (in CAD per share) | $ 53.96 48.20
Weighted average exercise price, exercised (in CAD per share) | $ 34.57 34.70
Weighted average exercise price, forfeited (in CAD per share) | $ 43.79 47.96
Weighted average exercise price, expired (in CAD per share) | $ 0.00 52.54
Weighted average exercise price, ending balance, (in CAD per share) | $ $ 37.06 $ 33.88
Exercisable, December 31 (in shares) | shares 2,041 2,071
Weighted average exercise price, exercisable (in CAD per share) | $ $ 30.97 $ 29.76