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Costs of services and general and administrative costs - Summary of Operating Costs (Parenthetical) (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Analysis of income and expense [abstract] |  |  |  |  |
Other pass-through costs | £ 316.3 | £ 258.5 | [1] | £ 558.8 | [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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