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Dividends (Details)
3 Months Ended 6 Months Ended
Aug. 30, 2024
day
Jul. 30, 2024
$ / shares
Jun. 30, 2024
$ / shares
Jun. 30, 2024
£ / shares
Jun. 30, 2023
$ / shares
Jun. 30, 2023
£ / shares
Jun. 30, 2024
$ / shares
Jun. 30, 2024
£ / shares
Jun. 30, 2023
$ / shares
Jun. 30, 2023
£ / shares
Disclosure of classes of share capital [line items]                    
Dividends Proposed Or Declared, Average Of Market Exchange Rates, Number Of Days | day 3                  
Ordinary shares [member]                    
Disclosure of classes of share capital [line items]                    
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share   $ 0.08000                
Dividends paid, ordinary shares per share | (per share)     $ 0.07270 £ 0.05683 $ 0.06610 £ 0.05309 $ 0.14540 £ 0.11375 $ 0.13220 £ 0.10860
ADS [Member]                    
Disclosure of classes of share capital [line items]                    
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share   $ 0.48                
Dividends paid, ordinary shares per share     $ 0.4362   $ 0.3966   $ 0.8724   $ 0.7932