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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, 2020 USD ($) award | Dec. 31, 2019 USD ($) award | Dec. 31, 2018 USD ($) award
Annual Performance Plan [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 496,000 | 591,000 | 616,000
Granted | 138,268 | 217,000 | 175,944
Vested | (188,000) | (276,000) | (199,000)
Share capital consolidation |  | (21,000) |
Lapsed or cancelled | (33,000) | (15,000) | (2,000)
Ending balance | 413,000 | 496,000 | 591,000
Fair value of awards granted during the year | $ | $ 49.659 | $ 58.887 | $ 60.662
Weighted average remaining contract life (years) | 1 year | 1 year 1 month 6 days | 1 year
LTIP Performance-related awards [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 695,000 | 1,088,000 | 2,393,000
Granted | 383,000 | 286,746 | 257,000
Vested | (179,000) | (293,000) | (702,000)
Lapsed or cancelled | (85,000) | (387,000) | (860,000)
Ending balance | 814,000 | 695,000 | 1,088,000
Fair value of awards granted during the year | $ | $ 24.735 | $ 49.856 | $ 47.487
Weighted average remaining contract life (years) | 1 year 4 months 24 days | 1 year 3 months 18 days | 9 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 | 1,275,000 | 1,301,000 | 916,000
Granted | 696,094 | 539,567 | 526,879
Vested | (413,000) | (422,000) |
Lapsed or cancelled | (137,000) | (144,000) | (142,000)
Ending balance | 1,421,000 | 1,275,000 | 1,301,000
Fair value of awards granted during the year | $ | $ 43.975 | $ 58.621 | $ 59.660
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/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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