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Share-based compensation - Changes in other equity instruments (Details) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period | 251,017 | 285,816
Number of outstanding units granted | 10,452 | 8,269
Number of outstanding units granted in lieu of dividends | 5,669 | 8,430
Number of outstanding units redeemed | (42,292) | (51,498)
Number of outstanding units cancelled | 0 | 0
Number of outstanding units, end of period | 224,846 | 251,017
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period | 18,649 | 13,864
Number of outstanding units granted | 8,100 | 11,500
Number of outstanding units granted in lieu of dividends | 613 | 773
Number of outstanding units redeemed | (6,907) | (7,488)
Number of outstanding units cancelled | 0 | 0
Number of outstanding units, end of period | 20,455 | 18,649
Performance share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period | 572,272 | 610,578
Number of outstanding units granted | 163,500 | 261,760
Number of outstanding units granted performance factor |  | 55,592
Number of outstanding units performance factor impact on redemption | (102,557) |
Number of outstanding units granted in lieu of dividends | 14,383 | 18,082
Number of outstanding units redeemed | (34,186) | (355,415)
Number of outstanding units cancelled | (8,517) | (18,325)
Number of outstanding units, end of period | 604,895 | 572,272

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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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