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Dividends (Details)
3 Months Ended 6 Months Ended
Sep. 02, 2022
day
Aug. 02, 2022
$ / shares
Jun. 30, 2022
$ / shares
Jun. 30, 2022
£ / shares
Jun. 30, 2021
$ / shares
Jun. 30, 2021
£ / shares
Jun. 30, 2022
$ / shares
Jun. 30, 2022
£ / shares
Jun. 30, 2021
$ / shares
Jun. 30, 2021
£ / 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   $ 0.06006                
Dividends paid, ordinary shares per share | (per share)     $ 0.05460 £ 0.04356 $ 0.05250 £ 0.03712 $ 0.10920 £ 0.08515 $ 0.10500 £ 0.07480
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   $ 0.36036                
Dividends paid, ordinary shares per share     $ 0.3276   $ 0.3150   $ 0.6552   $ 0.6300