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Intangible assets - Schedule of Pre-tax discount rates and terminal growth rates used for impairment testing (Details)
Jun. 30, 2024
Jun. 30, 2023
United States    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 9.00% 9.00%
Terminal growth rate 2.00% 2.00%
United Kingdom    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 9.00% 9.00%
Terminal growth rate 2.00% 2.00%
Türkiye    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 27.00% 28.00%
Terminal growth rate 14.00% 16.00%
India    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 12.00% 14.00%
Terminal growth rate 3.00% 4.00%
Greater China    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 10.00% 11.00%
Terminal growth rate 2.00% 2.00%
Mexico    
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate 13.00% 13.00%
Terminal growth rate 3.00% 3.00%