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Sources of finance - Analysis of Future Anticipated Cash Flows Related of Financial Derivatives (Detail) - GBP (£) £ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Trade and Other Payable [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | £ 615.9 | £ 1,376.2
Future anticipated cash flows, Financial assets | 44.0 | 632.5
Trade and Other Payable [member] | Within one year [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 113.6 | 229.3
Future anticipated cash flows, Financial assets | 44.0 | 124.6
Trade and Other Payable [member] | Between one and two years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 17.5 | 50.0
Future anticipated cash flows, Financial assets |  | 11.8
Trade and Other Payable [member] | Between two and three years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 11.8 | 688.4
Future anticipated cash flows, Financial assets |  | 11.5
Trade and Other Payable [member] | Between three and four years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 11.6 | 408.5
Future anticipated cash flows, Financial assets |  | 11.6
Trade and Other Payable [member] | Between four and five years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 11.6 |
Future anticipated cash flows, Financial assets |  | 11.6
Trade and Other Payable [member] | Over five years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 449.8 |
Future anticipated cash flows, Financial assets |  | 461.4
Trade and other receivable [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 593.4 | 1,359.1
Future anticipated cash flows, Financial assets | 45.0 | 644.8
Trade and other receivable [member] | Within one year [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 107.8 | 221.9
Future anticipated cash flows, Financial assets | 45.0 | 120.6
Trade and other receivable [member] | Between one and two years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 10.9 | 45.3
Future anticipated cash flows, Financial assets |  | 6.5
Trade and other receivable [member] | Between two and three years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 6.2 | 685.3
Future anticipated cash flows, Financial assets |  | 6.4
Trade and other receivable [member] | Between three and four years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 6.1 | 406.6
Future anticipated cash flows, Financial assets |  | 6.5
Trade and other receivable [member] | Between four and five years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | 6.1 |
Future anticipated cash flows, Financial assets |  | 6.6
Trade and other receivable [member] | Over five years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Future anticipated cash flows, Financial liabilities | £ 456.3 |
Future anticipated cash flows, Financial assets |  | £ 498.2

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- Definition The amount of contractual undiscounted cash flows in relation to derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 39 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_39_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Derivative Financial Assets Undiscounted Cash Flows + References No definition available. + Details
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