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Share-based payments - Summary of Movements in Awards Outstanding Under the Schemes (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
APP/DAP      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Beginning balance (in shares) 386 332 321
Granted (in shares) 82 104 214
Vested (in shares) (174) (44) (186)
Lapsed or cancelled (in shares) (5) (6) (17)
Ending balance (in shares) 289 386 332
Average fair value of awards granted during the year (cents) | $ $ 124.122 $ 108.376 $ 69.264
Weighted average remaining contract life (years) 1 year 10 months 24 days 1 year 6 months
Performance-related awards/LTI      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Beginning balance (in shares) 831 836 933
Granted (in shares) 270 279 329
Vested (in shares) (246) (136) (180)
Lapsed or cancelled (in shares) (77) (148) (246)
Ending balance (in shares) 778 831 836
Average fair value of awards granted during the year (cents) | $ $ 66.981 $ 58.126 $ 31.697
Weighted average remaining contract life (years) 1 year 1 month 6 days 1 year 1 month 6 days 1 year 3 months 18 days
LTIP/DAP      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Beginning balance (in shares) 1,649 1,662 1,575
Granted (in shares) 470 495 683
Vested (in shares) (599) (402) (533)
Lapsed or cancelled (in shares) (93) (106) (63)
Ending balance (in shares) 1,427 1,649 1,662
Average fair value of awards granted during the year (cents) | $ $ 117.54 $ 103.023 $ 63.51
Weighted average remaining contract life (years) 1 year 1 month 6 days 1 year 1 month 6 days 1 year 3 months 18 days