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Debt financing - Analysis of Future Anticipated Cash Flows Related to Debt (Detail) - GBP (£)
£ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Future anticipated cash flows £ (6,776.0) £ (5,579.0) £ (7,701.3)
Effect of discounting/financing rates 1,287.9 1,070.4 1,257.1
Debt financing (5,488.1) (4,508.6) (6,444.2)
Borrowings [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Future anticipated cash flows (6,549.5) (5,343.3) (7,365.4)
Borrowings [member] | Within one year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Corporate bonds, bank loans and overdrafts (249.8) (324.8) (936.6)
Borrowings [member] | Between one and two years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Corporate bonds, bank loans and overdrafts (366.9) (204.0) (327.7)
Borrowings [member] | Between two and three years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Corporate bonds, bank loans and overdrafts (532.0) (692.1) (990.0)
Borrowings [member] | Between three and four years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Corporate bonds, bank loans and overdrafts (793.7) (726.3) (496.1)
Borrowings [member] | Between four and five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Corporate bonds, bank loans and overdrafts (1,145.4) (634.2) (1,114.7)
Borrowings [member] | Over five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Corporate bonds, bank loans and overdrafts (3,461.7) (2,761.9) (3,500.3)
Bank overdrafts [member] | Within one year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Future anticipated cash flows £ (226.5) £ (235.7) £ (335.9)