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Analysis of cash flows - Summary of Analysis of Cash Flows (Parenthetical) (Detail)
€ in Millions, £ in Millions
Jun. 29, 2021
GBP (£)
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
EUR (€)
Kantar [member]      
Disclosure Of Cash Flow Statement [line items]      
Payments for further investment | £ £ 92.9    
Proceeds from issue of EURO 750 million bonds [member}      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | €     € 750
Proceeds from issue of GBP 250 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | £   £ 250.0  
Repayment of EURO 250 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | €     € 250