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Operating costs - Narrative (Details)
$ in Millions
 12 Months Ended
Jun. 30, 2024
USD ($)
employee
Jun. 30, 2023
USD ($)
employee
Jun. 30, 2022
USD ($)
employee
Disclosure of operating costs [line items]      
Number of employees on full time equivalent basis | employee 30,092 30,269 28,558
Average number of employees, including part time | employee 30,839 30,419 28,137
Other than principal auditor      
Disclosure of operating costs [line items]      
Auditor's remuneration for audit services $ 0.1 $ 0.1 $ 0.2
Principal auditor      
Disclosure of operating costs [line items]      
Auditor's remuneration for audit services 16.3 16.3 17.0
Audit services in respect of employee pension plans $ 0.4 $ 0.3 $ 0.3