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Basis of preparation - Narrative (Details)
 6 Months Ended
Dec. 31, 2023
£ / $
€ / $
Dec. 31, 2022
€ / $
£ / $
Jun. 30, 2023
€ / $
£ / $
Euro      
Disclosure of foreign exchange rates [Line Items]      
Weighted average exchange rate used in the translation of income statements | € / $ 0.92 0.98  
Exchange rates used to translate assets and liabilities | € / $ 0.90 0.94 0.93
Pound Sterling      
Disclosure of foreign exchange rates [Line Items]      
Weighted average exchange rate used in the translation of income statements | £ / $ 0.80 0.85  
Exchange rates used to translate assets and liabilities | £ / $ 0.79 0.83 0.79