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Trade and other payables - Payments Due to Vendors (Detail) - GBP (£) £ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |  |
Payments due to vendors, Current | £ 193.7 | £ 180.7 | £ 283.9 |
Payments due to vendors, Non-current | 349.2 | 450.0 | 586.8 |
Payments due to vendors | 542.9 | 630.7 | 870.7 | £ 976.5
Within one year [member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |  |
Payments due to vendors, Current | 193.7 | 180.7 | 283.9 |
Between one and two years [member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |  |
Payments due to vendors, Non-current | 131.4 | 128.3 | 163.0 |
Between two and three years [member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |  |
Payments due to vendors, Non-current | 96.5 | 144.1 | 167.0 |
Between three and four years [member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |  |
Payments due to vendors, Non-current | 61.3 | 58.3 | 148.5 |
Between four and five years [member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |  |
Payments due to vendors, Non-current | 49.9 | 103.1 | 83.5 |
Over five years [member] |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |  |  |
Payments due to vendors, Non-current | £ 10.1 | £ 16.2 | £ 24.8 |

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