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Share-Based Payments - Activities in Stock Option Plans (Details) shares in Thousands | 12 Months Ended
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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

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