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Intangible assets - Schedule of Pre-tax discount rates and terminal growth rates used for impairment testing (Details)
Jun. 30, 2022
Jun. 30, 2021
North America – United States    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 8.00% 7.00%
Terminal growth rate 2.00% 2.00%
Long-term growth rate 4.00% 4.00%
United Kingdom    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 8.00% 6.00%
Terminal growth rate 2.00% 2.00%
Long-term growth rate 4.00% 4.00%
Turkey    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 31.00% 22.00%
Terminal growth rate 15.00% 11.00%
Long-term growth rate 25.00% 16.00%
Australia    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 7.00% 6.00%
Terminal growth rate 2.00% 2.00%
Long-term growth rate 5.00% 5.00%
India    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 14.00% 12.00%
Terminal growth rate 4.00% 4.00%
Long-term growth rate 11.00% 11.00%
South Africa    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 16.00% 13.00%
Terminal growth rate 0.00% 0.00%
Long-term growth rate 6.00% 6.00%
Nigeria    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 24.00% 19.00%
Terminal growth rate 12.00% 10.00%
Long-term growth rate 15.00% 14.00%
Brazil    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 12.00% 11.00%
Terminal growth rate 3.00% 3.00%
Long-term growth rate 6.00% 6.00%