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Debt financing - Analysis of Future Anticipated Cash Flows Related to Debt (Detail) - GBP (£) £ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | £ (8,756.3) | £ (8,810.3) | £ (9,591.8)
Effect of discounting/financing rates | 1,903.4 | 1,935.8 | 2,066.3
Debt financing | (6,852.9) | (6,874.5) | (7,525.5)
Borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | (8,456.9) | (8,417.1) | (8,947.3)
Borrowings [member] | Within one year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | (175.7) | (391.7) | (463.4)
Borrowings [member] | Between one and two years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | (925.6) | (896.3) | (423.7)
Borrowings [member] | Between two and three years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | (594.8) | (584.3) | (914.1)
Borrowings [member] | Between three and four years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | (1,351.2) | (1,537.8) | (358.6)
Borrowings [member] | Between four and five years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | (496.7) | (487.9) | (1,778.3)
Borrowings [member] | Over five years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | (4,912.9) | (4,519.1) | (5,009.2)
Bank overdrafts [member] | Within one year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | £ (299.4) | £ (393.2) | £ (644.5)

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