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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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