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Equity - Summary of Treasury shares (Detail) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Treasury Shares [Line Items]      
Repurchased under share repurchase programme (in shares) 7.6 7.5 10.9
Repurchased under share repurchase programme $ 0.0 $ 0.0 $ 0.0
Number of shares | Treasury shares      
Disclosure Of Treasury Shares [Line Items]      
Beginning Balance (in shares) 6.2 7.0 7.5
Transferred to employee share trusts (in shares) (0.7) (0.8) (0.5)
Repurchased under share repurchase programme (in shares)     0.0
Exchange adjustments (in shares) 0.0 0.0  
Ending Balance (in shares) 5.5 6.2 7.0
Nominal value | Treasury shares      
Disclosure Of Treasury Shares [Line Items]      
Beginning Balance $ 1.6 $ 1.9 $ 1.9
Transferred to employee share trusts (0.2) (0.2) (0.1)
Repurchased under share repurchase programme     0.1
Exchange adjustments 0.1 (0.1)  
Ending Balance $ 1.5 $ 1.6 $ 1.9