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Earnings per ordinary share (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure [Abstract] |
Summary of Earnings/(loss) per ordinary share |
Basic earnings per ordinary share |  |  |  | 2024 |  |  |  |  | 2023 |  |  |  |  |  | 2022 |
Profit available for equity holders ($m) |  |  |  |  | 628 |  |  |  |  |  | 750 |  |  |  |  |  |  |  | 375 |
Basic weighted average number of ordinary shares (millions) |  |  |  |  | 161.2 |  |  |  |  |  | 169.0 |  |  |  |  |  |  |  | 181.0 |
Basic earnings per ordinary share (cents) |  |  |  |  | 389.6 |  |  |  |  |  | 443.8 |  |  |  |  |  |  |  | 207.2 |
Diluted earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit available for equity holders ($m) |  |  |  |  | 628 |  |  |  |  |  | 750 |  |  |  |  |  |  |  | 375 |
Diluted weighted average number of ordinary shares (millions) |  |  |  |  | 163.0 |  |  |  |  |  | 170.0 |  |  |  |  |  |  |  | 182.0 |
Diluted earnings per ordinary share (cents) |  |  |  |  | 385.3 |  |  |  |  |  | 441.2 |  |  |  |  |  |  |  | 206.0 |
Basic and diluted share denominators are calculated as follows: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | 2024 millions |  |  |  |  | 2023 millions |  |  |  |  |  | 2022 millions |
Weighted average number of ordinary shares in issue |  |  |  |  | 168.6 |  |  |  |  |  | 177.0 |  |  |  |  |  |  |  | 187.0 |
Weighted average number of treasury shares a |  |  |  |  | (7.4 | ) |  |  |  |  | (8.0 | ) |  |  |  |  |  |  | (6.0 | )
Basic weighted average number of ordinary shares |  |  |  |  | 161.2 |  |  |  |  |  | 169.0 |  |  |  |  |  |  |  | 181.0 |
Dilutive potential ordinary shares |  |  |  |  | 1.8 |  |  |  |  |  | 1.0 |  |  |  |  |  |  |  | 1.0 |
Diluted weighted average number of ordinary shares |  |  |  |  | 163.0 |  |  |  |  |  | 170.0 |  |  |  |  |  |  |  | 182.0 |
a. | Includes other shares that do not receive dividends.

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