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Equity - Summary of Treasury shares (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Treasury Shares [Line Items] |  |  |
Repurchased under share repurchase programme (Shares) | 10,900,000 | 9,100,000 |
Number of shares [Member] | Treasury shares [member] |  |  |
Disclosure Of Treasury Shares [Line Items] |  |  |
Beginning Balance (Shares) | 7,500,000 | 3,700,000 | 5,100,000
Transferred to employee share trusts (Shares) | (500,000) | (700,000) | (1,400,000)
Repurchased under share repurchase programme (Shares) |  | 4,500,000 |
Exchange adjustments (Share) | 0 |  |
Ending Balance (Shares) | 7,000,000 | 7,500,000 | 3,700,000
Nominal value [Member] | Treasury shares [member] |  |  |
Disclosure Of Treasury Shares [Line Items] |  |  |
Beginning Balance | $ 1.9 | $ 1.0 | $ 1.4
Transferred to employee share trusts | (0.1) | (0.2) | (0.4)
Repurchased under share repurchase programme |  | 1.1 |
Exchange adjustments | 0.1 |  |
Ending Balance | $ 1.9 | $ 1.9 | $ 1.0

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