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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 | £ (5,579.0) | £ (8,453.3)
Effect of discounting/financing rates | 1,070.4 | 1,793.4
Debt financing | (4,508.6) | (6,659.9)
Borrowings [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Future anticipated cash flows | (5,343.3) | (8,011.3)
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)
Bank overdrafts [member] | Within one year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Future anticipated cash flows | £ (235.7) | £ (442.0)

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- Definition The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_39_a&doctype=Standard -URIDate 2019-03-27 + Details
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