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Dividends (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure [Abstract] |
Summary of Dividends Paid |
|  |  |  | 2024 |  |  |  |  |  | 2023 |  |  |  |  |  | 2022 |
Paid during the year |  |  |  | cents per share |  |  | $m |  |  |  |  |  | cents per share |  |  | $m |  |  |  |  |  | cents per share |  |  | $m |
Final (declared for previous year) |  |  |  |  | 104.0 |  |  |  | 172 |  |  |  |  |  |  |  | 94.5 |  |  |  | 166 |  |  |  |  |  |  |  | 85.9 |  |  |  | 154 |
Interim |  |  |  |  | 53.2 |  |  |  | 87 |  |  |  |  |  |  |  | 48.3 |  |  |  | 79 |  |  |  |  |  |  |  | 43.9 |  |  |  | 79 |
|  |  |  |  | 157.2 |  |  |  | 259 |  |  |  |  |  |  |  | 142.8 |  |  |  | 245 |  |  |  |  |  |  |  | 129.8 |  |  |  | 233 |

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