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Earnings per share - Additional Information (Detail) - shares	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Treasury shares [member]
Earnings per share [line items]
Ordinary shares in issue	70,750,170	70,787,730	70,799,200
Ordinary shares [member]
Earnings per share [line items]
Ordinary shares in issue	1,296,079,242	1,328,167,813	1,332,703,852

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2019-03-27

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- Details

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- Details

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