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Events after the balance sheet date (Details) - USD ($)
$ / shares in Units, $ in Billions
3 Months Ended
Aug. 01, 2023
Jul. 28, 2023
Jun. 30, 2023
May 31, 2023
Feb. 28, 2022
Disclosure of non-adjusting events after reporting period [line items]          
Stock repurchase amount       $ 2.0 $ 1.0
Branch operations in Greece          
Disclosure of non-adjusting events after reporting period [line items]          
Impairment loss     $ 0.1    
Sale of operations | Branch operations in Greece          
Disclosure of non-adjusting events after reporting period [line items]          
Impairment loss   $ 0.1      
Share buy-back programme          
Disclosure of non-adjusting events after reporting period [line items]          
Stock repurchase amount $ 2.0        
Ordinary shares | Second interim dividend, 2023          
Disclosure of non-adjusting events after reporting period [line items]          
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share (in USD per share) $ 0.10