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Share-based compensation - Changes in other equity instruments (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in shares) | 209,092 | 224,846
Number of outstanding units granted (in shares) | 14,158 | 7,752
Number of outstanding units performance factor impact on redemption (in shares) | 0 | 0
Number of outstanding units granted in lieu of dividends (in shares) | 4,031 | 4,495
Number of outstanding units redeemed (in shares) | (137,515) | (28,001)
Number of outstanding units cancelled (in shares) | 0 | 0
Number of outstanding units, end of period (in shares) | 89,766 | 209,092
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in shares) | 17,361 | 20,455
Number of outstanding units granted (in shares) | 79,240 | 8,700
Number of outstanding units performance factor impact on redemption (in shares) | 0 | 0
Number of outstanding units granted in lieu of dividends (in shares) | 2,840 | 545
Number of outstanding units redeemed (in shares) | (15,428) | (12,339)
Number of outstanding units cancelled (in shares) | (845) | 0
Number of outstanding units, end of period (in shares) | 83,168 | 17,361
Performance share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units, beginning of period (in shares) | 579,778 | 604,895
Number of outstanding units granted (in shares) | 0 | 149,200
Number of outstanding units performance factor impact on redemption (in shares) | 132,215 | (127,733)
Number of outstanding units granted in lieu of dividends (in shares) | 9,909 | 12,303
Number of outstanding units redeemed (in shares) | (396,635) | (42,577)
Number of outstanding units cancelled (in shares) | (21,822) | (16,310)
Number of outstanding units, end of period (in shares) | 303,445 | 579,778
Performance Share Units (PSU) New Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding units granted (in shares) | 134,930 |
Number of outstanding units performance factor impact on redemption (in shares) | 0 |
Number of outstanding units granted in lieu of dividends (in shares) | 4,464 |
Number of outstanding units redeemed (in shares) | 0 |
Number of outstanding units cancelled (in shares) | (1,356) |
Number of outstanding units, end of period (in shares) | 138,038 |

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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 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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