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Share-based payments - Outstanding Stock Options (Details) | 12 Months Ended
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Dec. 31, 2018 CAD ($) shares $ / shares | Dec. 31, 2017 CAD ($) shares $ / shares
Share-based Payment Arrangements [Abstract] |  |
Outstanding, beginning balance (in shares) | shares | 10,490,249 | 10,242,162
Granted (in shares) | shares | 3,888,693 | 3,043,448
Exercised (in shares) | shares | (266,941) | (2,555,863)
Forfeited (in shares) | shares | (39,669) | (239,498)
Outstanding, ending balance (in shares) | shares | 14,072,332 | 10,490,249
Exercisable (in shares) | shares | 4,399,588 | 2,013,983
Weighted average exercise price of share options outstanding, beginning balance (CAD per share) | $ | $ 55 | $ 52
Weighted average exercise price of share options granted (CAD per share) | $ | 56 | 59
Weighted average exercise price of share options exercised (CAD per share) | $ | 42 | 45
Weighted average exercise price of share options forfeited (CAD per share) | $ | 58 | 58
Weighted average exercise price of share options outstanding, ending balance (CAD per share) | $ | 56 | 55
Weighted average exercise price of share options exercisable (CAD per share) | $ | $ 52 | $ 45
Weighted average share price, share options exercised (CAD per share) | $ / shares | $ 55 | $ 60

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2018-03-16 + Details
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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 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vii&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_iii&doctype=Standard -URIDate 2018-03-16 + Details
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