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Equity - Summary of Treasury shares (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Treasury Shares [Line Items] |  |  |
Repurchased under share repurchase programme (Shares) | 9.1 |  |
Number of shares [Member] | Treasury shares [member] |  |  |
Disclosure Of Treasury Shares [Line Items] |  |  |
Beginning Balance (Shares) | 3.7 | 5.1 | 5.7
Transferred to employee share trusts (Shares) | (0.7) | (1.4) | (0.6)
Repurchased under share repurchase programme (Shares) | 4.5 |  |
Ending Balance (Shares) | 7.5 | 3.7 | 5.1
Nominal value [Member] | Treasury shares [member] |  |  |
Disclosure Of Treasury Shares [Line Items] |  |  |
Beginning Balance | $ 1.0 | $ 1.4 | $ 1.6
Transferred to employee share trusts | (0.2) | (0.4) | (0.2)
Repurchased under share repurchase programme | 1.1 |  |
Ending Balance | $ 1.9 | $ 1.0 | $ 1.4

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- Definition An entity’s own equity instruments, held by the entity or other members of the consolidated group. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_e&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 32 -IssueDate 2022-03-24 -Paragraph 34 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=32&code=ifrs-tx-2022-en-r&anchor=para_34&doctype=Standard -URIDate 2022-03-24 + Details
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