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Segmental Analysis - Contributions by Reportable Segments (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |  |  |
Revenue |  | £ 7,616.0 | £ 7,492.7 | £ 15,602.4
Headline operating profit | [1] | 729.6 | 782.9 | 1,962.1
Global Integrated Agencies [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | [2] | 4,873.6 | 4,755.5 | 9,930.7
Revenue less pass-through costs | [2],[3] | 3,858.1 | 3,844.2 | 8,070.8
Headline operating profit | [1],[2] | £ 471.2 | £ 484.8 | £ 1,239.5
Headline operating profit margin | [2],[4] | 12.20% | 12.60% | 15.40%
Data investment management [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | [5] | £ 1,247.5 | £ 1,225.8 | £ 2,560.9
Revenue less pass-through costs | [3],[5] | 949.2 | 940.1 | 1,953.3
Headline operating profit | [1],[5] | £ 101.2 | £ 110.4 | £ 296.3
Headline operating profit margin | [4],[5] | 10.70% | 11.70% | 15.20%
Public Relations [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | [6] | £ 471.5 | £ 454.0 | £ 931.7
Revenue less pass-through costs | [3],[6] | 442.2 | 430.0 | 879.9
Headline operating profit | [1],[6] | £ 69.6 | £ 69.0 | £ 140.6
Headline operating profit margin | [4],[6] | 15.70% | 16.00% | 16.00%
Specialist Agencies [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | [7] | £ 1,023.4 | £ 1,057.4 | £ 2,179.1
Revenue less pass-through costs | [3],[7] | 899.4 | 934.6 | 1,922.6
Headline operating profit | [1],[7] | £ 87.6 | £ 118.7 | £ 285.7
Headline operating profit margin | [4],[7] | 9.70% | 12.70% | 14.90%
[1] | A reconciliation from operating profit to headline operating profit is provided in note 22.
[2] | Global Integrated Agencies includes all of Grey, GroupM, Hogarth, Ogilvy, VMLY&R & Wunderman Thompson.
[3] | Revenue less pass-through costs is revenue less media, data collection 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 and data collection costs. See note 4 for more details of the pass-through costs.
[4] | Headline operating profit margin is calculated as headline operating profit (defined above) as a percentage of revenue less pass-through costs.
[5] | Data Investment Management represents Kantar, which has been classified as a disposal group subsequent to the period ended 30 June 2019
[6] | Public Relations represents the Group's specialists in this area and remains as previously reported but excludes Ogilvy PR which now sits within Global Integrated Agencies as part of Ogilvy.
[7] | Specialist Agencies represent the Group's other agencies that specialise in certain areas, whether by region or range of services.

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