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Segment analysis - Contributions by Reportable Segments (Detail) - GBP (£) £ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | [1]
Disclosure of operating segments [line items] |  |  |  |
Revenue |  | £ 6,132.5 | £ 5,582.7 | [2]
Headline operating profit | [3] | 590.4 | 382.3 |
Global integrated agencies [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue |  | 5,169.7 | 4,725.1 |
Revenue less pass-through costs | [4] | 4,068.9 | 3,896.2 |
Headline operating profit | [3] | 482.9 | 282.3 |
Public relations [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue |  | 449.9 | 446.8 |
Revenue less pass-through costs | [4] | 429.4 | 426.3 |
Headline operating profit | [3] | 63.5 | 71.9 |
Specialist agencies [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue |  | 512.9 | 410.8 |
Revenue less pass-through costs | [4] | 400.9 | 345.2 |
Headline operating profit | [3] | £ 44.0 | £ 28.1 |
[1] | During 2020, the Group announced the intention to combine Grey and AKQA into AKQA Group, and to bring Geometry and GTB into VMLY&R, and International Healthcare into VMLY&R and Ogilvy. As a result AKQA, Geometry, GTB and International Healthcare are now reported within Global Integrated Agencies, having previously been reported within Specialist Agencies. Prior year figure have been re-presented to reflect these changes.
[2] | Figures have been restated as described in the accounting policies.
[3] | A reconciliation from operating profit/(loss) to headline operating profit is provided in note 20.
[4] | Revenue less pass-through costs is revenue less media, and other pass-through costs. Pass-through costs comprise fees paid to external suppliers where they are engaged to perform part or all of a specific project and are charged directly to clients, predominantly media costs. See note 4 for more details of the pass-through costs.

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