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Share-based payments - Summary of Movements in Awards Outstanding Under the Schemes (Detail) | 12 Months Ended
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Dec. 31, 2023 USD ($) award | Dec. 31, 2022 USD ($) award | Dec. 31, 2021 USD ($) award
Annual Performance Plan [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 321,000 | 348,000 | 413,000
Granted | 214,000 | 236,000 | 90,000
Vested | (186,000) | (254,000) | (147,000)
Lapsed or cancelled | (17,000) | (9,000) | (8,000)
Ending balance | 332,000 | 321,000 | 348,000
Fair value of awards granted during the year | $ | $ 69.264 | $ 61.802 | $ 68.885
Weighted average remaining contract life (years) | 1 year 6 months | 1 year | 6 months
LTIP Performance-related awards [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 933,000 | 872,000 | 814,000
Granted | 329,000 | 323,000 | 281,000
Vested | (180,000) | (23,000) | (70,000)
Lapsed or cancelled | (246,000) | (239,000) | (153,000)
Ending balance | 836,000 | 933,000 | 872,000
Fair value of awards granted during the year | $ | $ 31.697 | $ 37.70 | $ 46.763
Weighted average remaining contract life (years) | 1 year 3 months 18 days | 1 year 1 month 6 days | 1 year 2 months 12 days
LTIP Restricted stock units [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 1,575,000 | 1,350,000 | 1,421,000
Granted | 683,000 | 706,000 | 442,000
Vested | (533,000) | (391,000) | (391,000)
Lapsed or cancelled | (63,000) | (90,000) | (122,000)
Ending balance | 1,662,000 | 1,575,000 | 1,350,000
Fair value of awards granted during the year | $ | $ 63.51 | $ 56.564 | $ 65.597
Weighted average remaining contract life (years) | 1 year 3 months 18 days | 1 year 2 months 12 days | 1 year 2 months 12 days

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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