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Earnings per share - Summary of Weighted Average Shares and Adjusted Weighted Average Shares (Details) - shares	12 Months Ended
	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

Antidilutive Securities Excluded From Computation of Earnings Per Share

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Dilutive effect of restricted share units on number of ordinary shares

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- Definition

Dilutive impact of performance share units and restricted share units with performance criteria

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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
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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
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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.

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