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Share Plans - Schedule of Movement in Number of Shares held by ESOP Trustees (Details) - Ordinary shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 $ / shares shares | Dec. 31, 2023 £ / shares | Dec. 31, 2022 $ / shares | Dec. 31, 2022 £ / shares | Dec. 31, 2021 $ / shares
Class of Stock [Line Items] |  |  |  |  |
Common stock, par value (in GBP per share) | (per share) | $ 0.50 | £ 0.50 | $ 0.50 | £ 0.50 | $ 0.50
Movement in Number of Shares held by ESOP Trustees [Roll Forward] |  |  |  |  |
Shares utilized during the year | (85,460) |  |  |  |
Own shares held by ESOP |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares |  | £ 0.50 |  | £ 0.50 |
Movement in Number of Shares held by ESOP Trustees [Roll Forward] |  |  |  |  |
Beginning balance | 721,261 |  |  |  |
Ending balance | 635,801 |  |  |  |

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