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Segmental analysis - Contributions by reportable segments (Detail) - GBP (£) £ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Disclosure of operating segments [line items] |  |
Revenue | £ 6,755.3 | £ 6,132.5
Revenue less pass-through costs |  |
Headline operating profit | 639.1 | 590.4
Reportable segments | Operating segments | Global Integrated Agencies |  |
Disclosure of operating segments [line items] |  |
Revenue | 5,701.0 | 5,202.9
Revenue less pass-through costs | 4,538.2 | 4,097.3
Headline operating profit | 507.5 | 488.6
Reportable segments | Operating segments | Public Relations |  |
Disclosure of operating segments [line items] |  |
Revenue | 572.4 | 449.9
Revenue less pass-through costs | 545.4 | 429.4
Headline operating profit | 83.0 | 63.5
Reportable segments | Operating segments | Specialist Agencies |  |
Disclosure of operating segments [line items] |  |
Revenue | 481.9 | 479.7
Revenue less pass-through costs | 425.9 | 372.5
Headline operating profit | £ 48.6 | £ 38.3

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