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Costs of services and general and administrative costs - Summary of Operating Costs (Parenthetical) (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Analysis of income and expense [abstract] |  |  |
Other pass-through costs | £ 731.4 | £ 713.0 | £ 573.1

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