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Share-based compensation - Disclosure of deferred and restricted share units (Details) - share | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
DSU (cash) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units, beginning of period | 317,209 | 266,442
Number of units, granted | 0 | 82,600
Number of units reinvested (dividends on common shares) | 2,352 | 4,696
Number of units, settled | (37,185) | (36,529)
Number of units, transfer from cash-settled to equity-settled | (282,376) | 0
Number of units, forfeited | 0 | 0
Number of units, end of period | 0 | 317,209
Number of units, vested | 0 | 233,883
DSU (equity) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units, beginning of period | 0 |
Number of units, granted | 66,000 |
Number of units reinvested (dividends on common shares) | 2,529 |
Number of units, settled | (16,866) |
Number of units, transfer from cash-settled to equity-settled | 282,376 |
Number of units, forfeited | (8,832) |
Number of units, end of period | 325,207 |
Number of units, vested | 267,565 |
Restricted Share Units ("RSU") [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units, beginning of period | 3,046 | 600,627
Number of units, granted | 0 | 23,700
Number of units reinvested (dividends on common shares) | 23 | 7,064
Number of units, settled | (3,069) | (192,719)
Number of units, transfer from cash-settled to equity-settled | 0 | (428,090)
Number of units, forfeited | 0 | (7,536)
Number of units, end of period | 0 | 3,046
Number of units, vested | 0 | 0
RSU (equity) [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units, beginning of period | 848,759 | 0
Number of units, granted | 592,300 | 429,262
Number of units reinvested (dividends on common shares) | 14,600 | 6,277
Number of units, settled | (176,704) | 0
Number of units, transfer from cash-settled to equity-settled | 0 | 428,090
Number of units, forfeited | (88,917) | (14,870)
Number of units, end of period | 1,190,038 | 848,759
Number of units, vested | 70,320 | 69,257

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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 2018-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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