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Earnings per ordinary share
 12 Months Ended
Dec. 31, 2025
Earnings per share [abstract]  
Earnings per ordinary share 10. Earnings per ordinary share
Basic earnings per ordinary share
2025
2024
2023
Profit available for equity holders ($m)
758
628
750
Basic weighted average number of ordinary shares (millions)
154.4
161.2
169.0
Basic earnings per ordinary share (cents)
490.9
389.6
443.8
Diluted earnings per ordinary share
Profit available for equity holders ($m)
758
628
750
Diluted weighted average number of ordinary shares (millions)
155.8
163.0
170.0
Diluted earnings per ordinary share (cents)
486.5
385.3
441.2
Basic and diluted share denominators are calculated as follows:
2025
millions
2024
millions
2023
millions
Weighted average number of ordinary shares in issue
161.0
168.6
177.0
Weighted average number of treasury sharesa
(6.6)
(7.4)
(8.0)
Basic weighted average number of ordinary shares
154.4
161.2
169.0
Dilutive potential ordinary shares
1.4
1.8
1.0
Diluted weighted average number of ordinary shares
155.8
163.0
170.0
a.Includes other shares that do not receive dividends.