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Dividends - Additional Information (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of dividends paid and proposed [line items] |  |  |
Final Proposed (not recognised as a liability at 31 December) | $ 0.859 | $ 0.781 | $ 0.710
Proposed dividends [member] |  |  |
Disclosure of dividends paid and proposed [line items] |  |  |
Final Proposed (not recognised as a liability at 31 December) | $ 0.859 |  |
Final Proposed (not recognised as a liability at 31 December) dividend approval date | May 07, 2020 |  |
Final proposed dividend record date | Apr. 03, 2020 |  |

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- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_137_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of dividends paid and proposed. + References No definition available. + Details
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- Definition Final proposed dividend approval date. + References No definition available. + Details
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- Definition Final proposed dividend record date. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |