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Sources of finance - Analysis of Future Anticipated Cash Flows Related to Debt (Detail) - GBP (£) £ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows |  | £ (13,915.7) | £ (16,875.9)
Effect of discounting/financing rates |  | 1,070.4 | 1,793.4
Debt financing |  | (12,845.3) | (15,082.5)
Borrowings [member] | Within one year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows |  | (324.8) | (748.4)
Borrowings [member] | Between one and two years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows |  | (204.0) | (596.8)
Borrowings [member] | Between two and three years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows |  | (692.1) | (937.1)
Borrowings [member] | Between three and four years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows |  | (726.3) | (742.5)
Borrowings [member] | Between four and five years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows |  | (634.2) | (786.8)
Borrowings [member] | Over five years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows |  | (2,761.9) | (4,199.7)
Borrowings [member] | Debt financing (including interest) under the Revolving Credit Facility and in relation to unsecured loan notes [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows |  | (5,343.3) | (8,011.3)
Bank overdrafts [member] | Within one year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |
Future anticipated cash flows | [1] | £ (8,572.4) | £ (8,864.6)
[1] | Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies of the consolidated financial statements.

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