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Accounting policies - Summary of the Impact of Adopting IFRS 15 (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Revenue | £ 7,492.7 | £ 7,650.4 | [1],[2] | £ 15,804.2 | [1],[2]
Costs of services | (6,218.7) | (6,282.3) | [1],[2] | (12,629.0) | [1],[2]
Gross profit | £ 1,274.0 | 1,368.1 | [1] | 3,175.2 | [1]
Pre IFRS 15 [Member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Revenue |  | 7,403.6 |  | 15,265.4 |
Costs of services |  | (6,035.5) |  | (12,090.2) |
Gross profit |  | 1,368.1 |  | 3,175.2 |
Impact due to adoption of IFRS 15 [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Revenue |  | 246.8 |  | 538.8 |
Costs of services |  | £ (246.8) |  | £ (538.8) |
[1] | Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.
[2] | 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 amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_103&doctype=Standard -URIDate 2017-03-09 + Details
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