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Trade and other payables - Summary of Trade and Other Payables, Amounts Falling Due within One Year (Detail) - GBP (£) £ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Trade and other current payables [abstract] |  |  |  |  |
Trade payables | £ 9,611.7 | £ 9,893.0 |  | £ 9,087.5 |
Deferred income | 1,284.5 | 1,212.1 |  | 1,188.3 |
Payments due to vendors (earnout agreements) | 193.7 | 180.7 |  | 283.9 |
Liabilities in respect of put option agreements with vendors | 50.0 | 38.6 |  | 36.7 |
Fair value of derivatives | 2.2 | 3.5 |  | 2.8 |
Other creditors and accruals | 2,874.5 | 2,913.2 |  | 2,829.0 |
Total | £ 14,016.6 | £ 14,241.1 | [1] | £ 13,428.2 | [1]
[1] | Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.

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- Definition The current amount of payment due to suppliers for goods and services used in entity's business. [Refer: Current liabilities; Trade payables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 70 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_70&doctype=Standard -URIDate 2017-03-09 + Details
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