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Employee benefits and share-based payments (Details) - shares
shares in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
At the beginning 2.1 2.4 2.8
Granted (0.1) (0.3) (0.4)
At the end 2.0 2.1 2.4