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Cash and cash equivalents and debt financing - Analysis of future anticipated cash flows related to debt (Detail) - GBP (£)
£ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Future anticipated cash flows £ (5,658.3) £ (5,798.1)
Effect of discounting/financing rates 748.5 1,014.1
Debt financing (4,909.8) (4,784.0)
Borrowings    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Future anticipated cash flows (5,372.6) (5,455.8)
Borrowings | Within one year    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (121.6) (326.8)
Borrowings | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (755.9) (745.4)
Borrowings | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (1,129.7) (646.5)
Borrowings | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (73.2) (492.8)
Borrowings | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (1,352.2) (698.0)
Borrowings | Over 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (1,940.0) (2,546.3)
Bank overdrafts | Within one year    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Future anticipated cash flows £ (285.7) £ (342.3)