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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, 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

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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2019-03-27 + Details
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