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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, 2022 USD ($) award | Dec. 31, 2021 USD ($) award | Dec. 31, 2020 USD ($) award
Annual Performance Plan [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 348,000 | 413,000 | 496,000
Granted | 236,000 | 90,000 | 138,000
Vested | (254,000) | (147,000) | (188,000)
Lapsed or cancelled | (9,000) | (8,000) | (33,000)
Ending balance | 321,000 | 348,000 | 413,000
Fair value of awards granted during the year | $ | $ 61.802 | $ 68.885 | $ 49.659
Weighted average remaining contract life (years) | 1 year | 6 months | 1 year
LTIP Performance-related awards [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 872,000 | 814,000 | 695,000
Granted | 323,000 | 281,000 | 383,000
Vested | (23,000) | (70,000) | (179,000)
Lapsed or cancelled | (239,000) | (153,000) | (85,000)
Ending balance | 933,000 | 872,000 | 814,000
Fair value of awards granted during the year | $ | $ 37.70 | $ 46.763 | $ 24.735
Weighted average remaining contract life (years) | 1 year 1 month 6 days | 1 year 2 months 12 days | 1 year 4 months 24 days
LTIP Restricted stock units [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 1,350,000 | 1,421,000 | 1,275,000
Granted | 706,000 | 442,000 | 696,000
Vested | (391,000) | (391,000) | (413,000)
Lapsed or cancelled | (90,000) | (122,000) | (137,000)
Ending balance | 1,575,000 | 1,350,000 | 1,421,000
Fair value of awards granted during the year | $ | $ 56.564 | $ 65.597 | $ 43.975
Weighted average remaining contract life (years) | 1 year 2 months 12 days | 1 year 2 months 12 days | 1 year 3 months 18 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/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_45&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard -URIDate 2022-03-24 + Details
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