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Share-based payments - Outstanding RSUs/PSUs Activity (Details) - RSUs/PSUs | 12 Months Ended
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Dec. 31, 2017 shares | Dec. 31, 2016 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance, outstanding (in shares) | 2,928,698 | 3,333,583
Granted (in shares) | 879,626 | 874,888
Dividends credited (in shares) | 132,402 | 137,583
Settled (in shares) | (1,096,403) | (1,321,846)
Forfeited (in shares) | (103,931) | (95,510)
Ending balance, outstanding (in shares) | 2,740,392 | 2,928,698
Vested, As of December 31(in shares) | 985,382 | 1,058,200
Weighted average fair value at measurement date, other equity instruments granted | $ |  | $ 58

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- Definition The number of other equity instruments (ie other than share options) granted 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 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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