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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, 2023
Dec. 31, 2022
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Future anticipated cash flows £ (6,448.0) £ (5,969.7)
Effect of discounting/financing rates 1,017.1 998.9
Debt financing (5,430.9) (4,970.8)
Borrowings    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Future anticipated cash flows (6,000.5) (5,464.0)
Borrowings | Within one year    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (779.7) (791.6)
Borrowings | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (1,129.2) (724.3)
Borrowings | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (99.1) (524.2)
Borrowings | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (1,376.0) (740.3)
Borrowings | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (711.6) (719.9)
Borrowings | Over five years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Corporate bonds, bank loans and overdrafts (1,904.9) (1,963.7)
Bank overdrafts | Within one year    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Future anticipated cash flows £ (447.5) £ (505.7)