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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, 2021 USD ($) award | Dec. 31, 2020 USD ($) award | Dec. 31, 2019 USD ($) award
Annual Performance Plan [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 413,000 | 496,000 | 591,000
Granted | 90,000 | 138,000 | 217,000
Vested | (147,000) | (188,000) | (276,000)
Share capital consolidation |  |  | (21,000)
Lapsed or cancelled | (8,000) | (33,000) | (15,000)
Ending balance | 348,000 | 413,000 | 496,000
Fair value of awards granted during the year | $ | $ 68.885 | $ 49.650 | $ 58.887
Weighted average remaining contract life (years) | 6 months | 1 year | 1 year 1 month 6 days
LTIP Performance-related awards [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 814,000 | 695,000 | 1,088,000
Granted | 281,000 | 383,000 | 287,000
Vested | (70,000) | (179,000) | (293,000)
Lapsed or cancelled | (153,000) | (85,000) | (387,000)
Ending balance | 872,000 | 814,000 | 695,000
Fair value of awards granted during the year | $ | $ 46.763 | $ 24.735 | $ 49.856
Weighted average remaining contract life (years) | 1 year 2 months 12 days | 1 year 4 months 24 days | 1 year 3 months 18 days
LTIP Restricted stock units [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 1,421,000 | 1,275,000 | 1,301,000
Granted | 442,000 | 696,000 | 540,000
Vested | (391,000) | (413,000) | (422,000)
Lapsed or cancelled | (122,000) | (137,000) | (144,000)
Ending balance | 1,350,000 | 1,421,000 | 1,275,000
Fair value of awards granted during the year | $ | $ 65.597 | $ 43.975 | $ 58.621
Weighted average remaining contract life (years) | 1 year 2 months 12 days | 1 year 3 months 18 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/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
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