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Finance income and charges - Narrative (Details) | 6 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
TURKEY |  |
Disclosure of geographical areas [line items] |  |
Movement in Price Index in hyperinflationary economy | 38.00% | 15.00%
Venezuela |  |
Disclosure of geographical areas [line items] |  |
Movement in Price Index in hyperinflationary economy | 54.00% | 105.00%
GHANA |  |
Disclosure of geographical areas [line items] |  |
Movement in Price Index in hyperinflationary economy | 9.00% |

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