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Earnings per share - Summary of Weighted Average Shares and Adjusted Weighted Average Shares (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
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) | 158,856 | 158,509
Dilutive impact of share options (in shares) | 0 | 0
Dilutive impact of restricted share units (in shares) | 526 | 0
Dilutive impact of performance share units and restricted share units with performance criteria (in shares) | 2,157 | 0
Weighted average number of ordinary shares used in the calculation of diluted earnings per share (in shares) | 161,539 | 158,509

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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 2018-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2018-03-01&anchor=para_70_b&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2018-03-01&anchor=para_70_b&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2018-03-01&anchor=para_70_b&doctype=Standard -URIDate 2018-03-16 + Details
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