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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
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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The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities.

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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

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