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Earnings/(loss) per ordinary share (Tables) | 12 Months Ended
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Dec. 31, 2022
Text Block [Abstract] |
Summary of Earnings/(loss) per ordinary share |
Basic earnings/(loss) per ordinary share |  |  |  |  | 2022 |  |  |  |  |  | 2021 |  |  |  |  |  | 2020 |
Profit/(loss) available for equity holders ($m) |  |  |  |  |  |  | 375 |  |  |  |  |  |  |  | 266 |  |  |  |  |  |  |  | (260 | )
Basic weighted average number of ordinary shares (millions) |  |  |  |  |  |  | 181 |  |  |  |  |  |  |  | 183 |  |  |  |  |  |  |  | 182 |
Basic earnings/(loss) per ordinary share (cents) |  |  |  |  |  |  | 207.2 |  |  |  |  |  |  |  | 145.4 |  |  |  |  |  |  |  | (142.9 | )
Diluted earnings/(loss) per ordinary share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit/(loss) available for equity holders ($m) |  |  |  |  |  |  | 375 |  |  |  |  |  |  |  | 266 |  |  |  |  |  |  |  | (260 | )
Diluted weighted average number of ordinary shares (millions) |  |  |  |  |  |  | 182 |  |  |  |  |  |  |  | 184 |  |  |  |  |  |  |  | 182 |
Diluted earnings/(loss) per ordinary share (cents) |  |  |  |  |  |  | 206.0 |  |  |  |  |  |  |  | 144.6 |  |  |  |  |  |  |  | (142.9) |
Basic and diluted share denominators are calculated as follows:
|  |  |  |  | 2022 millions |  |  |  |  |  | 2021 millions |  |  |  |  |  | 2020 millions |
Weighted average number of ordinary shares in issue |  |  |  |  |  |  | 187 |  |  |  |  |  |  |  | 187 |  |  |  |  |  |  |  | 187 |
Weighted average number of treasury shares |  |  |  |  |  |  | (6 | ) |  |  |  |  |  |  | (4 | ) |  |  |  |  |  |  | (5 | )
Basic weighted average number of ordinary shares |  |  |  |  |  |  | 181 |  |  |  |  |  |  |  | 183 |  |  |  |  |  |  |  | 182 |
Dilutive potential ordinary shares |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  | – |
Diluted weighted average number of ordinary shares |  |  |  |  |  |  | 182 |  |  |  |  |  |  |  | 184 |  |  |  |  |  |  |  | 182 |

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