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Subsequent event (Details)
$ / shares in Units, $ in Millions
Jul. 27, 2021
USD ($)
$ / shares
Dividends declared [Member]  
Disclosure of non-adjusting events after reporting period [line items]  
Dividends declared per share | $ / shares $ 0.18
Share transactions [Member] | Share buyback programme [Member]  
Disclosure of non-adjusting events after reporting period [line items]  
Treasury shares purchased | $ $ 300