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Share Plans - Schedule of Movement in Number of Shares held by ESOP Trustees (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2025 £ / shares shares | Dec. 31, 2025 $ / shares | Dec. 31, 2024 £ / shares | Dec. 31, 2024 $ / shares | Dec. 31, 2023 $ / shares
Class of Stock [Line Items] |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares | £ 0.50 |  | £ 0.50 |  |
Ordinary 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 | (118,128) |  |  |  |
Ordinary shares | 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 | 544,603 |  |  |  |
Ending balance | 426,475 |  |  |  |

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- Definition Line items represent financial concepts included in a table. 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