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Share-based compensation - Changes in other equity instruments (Details) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period | 224,846 | 251,017
Number of outstanding units granted | 7,752 | 10,452
Number of outstanding units performance factor impact on redemption | 0 | 0
Number of outstanding units granted in lieu of dividends | 4,495 | 5,669
Number of outstanding units redeemed | (28,001) | (42,292)
Number of outstanding units cancelled | 0 | 0
Number of outstanding units, end of period | 209,092 | 224,846
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period | 20,455 | 18,649
Number of outstanding units granted | 8,700 | 8,100
Number of outstanding units performance factor impact on redemption | 0 | 0
Number of outstanding units granted in lieu of dividends | 545 | 613
Number of outstanding units redeemed | (12,339) | (6,907)
Number of outstanding units cancelled | 0 | 0
Number of outstanding units, end of period | 17,361 | 20,455
Performance share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period | 604,895 | 572,272
Number of outstanding units granted | 149,200 | 163,500
Number of outstanding units performance factor impact on redemption | (127,733) | (102,557)
Number of outstanding units granted in lieu of dividends | 12,303 | 14,383
Number of outstanding units redeemed | (42,577) | (34,186)
Number of outstanding units cancelled | (16,310) | (8,517)
Number of outstanding units, end of period | 579,778 | 604,895

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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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