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Share-based payment arrangements - Summary of Status and Movements in RSUs and PSUs (Details) - Options | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Restricted Shares Without Performance Criteria |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance (in shares) | 333,119 | 341,198
Granted (in shares) | 391,092 | 214,859
Redeemed (in shares) | (137,594) | (181,491)
Forfeited (in shares) | (50,287) | (41,447)
Ending balance (in shares) | 536,330 | 333,119
Restricted Shares With Performance Criteria |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance (in shares) | 152,927 | 0
Granted (in shares) | 412,473 | 167,976
Forfeited (in shares) | (107,902) | (15,049)
Ending balance (in shares) | 457,498 | 152,927
Performance share unit |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance (in shares) | 484,899 | 381,293
Granted (in shares) | 264,083 | 261,522
Redeemed (in shares) | (129,109) | (118,605)
Forfeited (in shares) | (8,988) | (39,311)
Ending balance (in shares) | 610,885 | 484,899

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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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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: 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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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: 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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