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Earnings per share - Summary of Weighted Average Shares and Adjusted Weighted Average Shares (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract] |  |
Weighted average number of ordinary shares used in the calculation of basic earnings per share (in shares) | 171,047,400 | 158,855,924
Dilutive impact of share options (in shares) | 1,369,750 | 0
Dilutive impact of restricted share units (in shares) | 433,838 | 526,058
Dilutive impact of performance share units and restricted share units with performance criteria (in shares) | 2,379,892 | 2,156,654
Weighted average number of ordinary shares used in the calculation of diluted earnings per share (in shares) | 175,230,880 | 161,538,636
Antidilutive securities excluded from computation of earnings per share (in shares) | 2,680,593 | 5,714,491

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- Definition Dilutive effect of restricted share units on number of ordinary shares + References No definition available. + Details
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- Definition Dilutive impact of performance share units and restricted share units with performance criteria + References No definition available. + Details
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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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