Operating costs - Narrative (Details) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Jun. 30, 2026
USD ($)
employee
|
Jun. 30, 2025
USD ($)
employee
|
Jun. 30, 2024
USD ($)
employee
|
|
| Disclosure of operating costs [line items] | |||
| Number of employees on full time equivalent basis | employee | 27,972 | 29,632 | 30,092 |
| Average number of employees, including part time | employee | 28,400 | 30,232 | 30,839 |
| Other than principal auditor | |||
| Disclosure of operating costs [line items] | |||
| Auditor's remuneration for audit services | $ 2.9 | $ 0.5 | $ 0.1 |
| Principal auditor | |||
| Disclosure of operating costs [line items] | |||
| Auditor's remuneration | 16.3 | 18.8 | 18.0 |
| Auditor's remuneration for audit services | 15.1 | 18.0 | 17.0 |
| Auditors Remuneration For Audit Related Fees | 1.2 | 0.8 | 1.0 |
| Audit services in respect of employee pension plans | $ 0.6 | $ 0.6 | $ 0.4 |