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Costs of services and general and administrative costs - Summary of Operating Costs (Parenthetical) (Detail) - GBP (£) £ in Millions	12 Months Ended
	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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Other pass through costs

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