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Equity - Summary of Treasury shares (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Treasury Shares [Line Items] |  |  |
Repurchased under share repurchase programme (Shares) | 7.5 | 10.9 | 9.1
Number of shares [Member] | Treasury shares [member] |  |  |
Disclosure Of Treasury Shares [Line Items] |  |  |
Beginning Balance (Shares) | 7.0 | 7.5 | 3.7
Transferred to employee share trusts (Shares) | (0.8) | (0.5) | (0.7)
Repurchased under share repurchase programme (Shares) |  |  | 4.5
Exchange adjustments (Share) | 0.0 | 0.0 |
Ending Balance (Shares) | 6.2 | 7.0 | 7.5
Nominal value [Member] | Treasury shares [member] |  |  |
Disclosure Of Treasury Shares [Line Items] |  |  |
Beginning Balance | $ 1.9 | $ 1.9 | $ 1.0
Transferred to employee share trusts | (0.2) | (0.1) | (0.2)
Repurchased under share repurchase programme |  |  | 1.1
Exchange adjustments | (0.1) | 0.1 |
Ending Balance | $ 1.6 | $ 1.9 | $ 1.9

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