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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