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Share-based payments - Outstanding Stock Options (Details) | 12 Months Ended
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Dec. 31, 2017 CAD ($) shares $ / shares | Dec. 31, 2016 CAD ($) shares $ / shares
Share-based Payment Arrangements [Abstract] |  |
Outstanding, beginning balance (in shares) | shares | 10,242,162 | 9,666,904
Granted (in shares) | shares | 3,043,448 | 2,968,062
Exercised (in shares) | shares | (2,555,863) | (2,236,891)
Forfeited (in shares) | shares | (239,498) | (155,913)
Outstanding, ending balance (in shares) | shares | 10,490,249 | 10,242,162
Exercisable at December 31 (in shares) | shares | 2,013,983 | 1,786,251
Weighted average exercise price of share options outstanding, beginning balance (CAD per share) | $ | $ 52 | $ 48
Weighted average exercise price of share options granted (CAD per share) | $ | 59 | 58
Weighted average exercise price of share options exercised (CAD per share) | $ | 45 | 44
Weighted average exercise price of share options forfeited (CAD per share) | $ | 58 | 52
Weighted average exercise price of share options outstanding, ending balance (CAD per share) | $ | 55 | 52
Weighted average exercise price of share options exercisable at December 31 (CAD per share) | $ | $ 45 | $ 42
Weighted average share price, share options exercised (CAD per share) | $ / shares | $ 60 | $ 59

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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 exercised 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 iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iv&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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