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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.