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Share-based payments - Outstanding Stock Options (Details) | 6 Months Ended
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Jun. 30, 2018 CAD ($) shares $ / shares
Share-based Payment Arrangements [Abstract] |
Outstanding, January 1, 2018 (in shares) | shares | 10,490,249
Granted (in shares) | shares | 3,651,802
Exercised (in shares) | shares | (59,756)
Forfeited (in shares) | shares | (4,641)
Outstanding, June 30, 2018 (in shares) | shares | 14,077,654
Exercisable, June 30, 2018 (in shares) | shares | 4,606,773
Weighted average exercise price of share options outstanding, beginning balance (CAD per share) | $ | $ 55
Weighted average exercise price of share options granted (CAD per share) | $ | 57
Weighted average exercise price of share options exercised (CAD per share) | $ | 39
Weighted average exercise price of share options forfeited (CAD per share) | $ | 59
Weighted average exercise price of share options outstanding, ending balance (CAD per share) | $ | 56
Weighted average exercise price of share options exercisable at December 31 (CAD per share) | $ | $ 52
Weighted average share price, share options exercised (CAD per share) | $ / shares | $ 56

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- Definition Weighted Average Share Price, Share Options Exercised1 + References No definition available. + Details
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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 2017-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vii&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iii&doctype=Standard -URIDate 2017-03-09 + Details
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