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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, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Analysis of income and expense [abstract] |  |  |
Other pass-through costs | £ 350.9 | £ 316.3 | £ 708.6

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- Definition Other pass through costs + References No definition available. + Details
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