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Segmental Analysis - Summary of Reported Contributions by Operating Sector (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
 [2]
Dec. 31, 2017
 [2]
Disclosure of operating segments [line items]      
Revenue £ 7,492.7 £ 7,650.4 [1] £ 15,804.2 [1]
Headline PBIT [3] 820.7 882.0 2,267.1
Advertising and media investment management [member]      
Disclosure of operating segments [line items]      
Revenue 3,441.1 3,570.1 7,368.7
Revenue less pass-through costs [4] 2,639.0 2,848.2 5,889.3
Headline PBIT [3] £ 380.3 £ 431.8 £ 1,109.0
Headline PBIT margin [5] 14.40% 15.20% 18.80%
Data investment management [member]      
Disclosure of operating segments [line items]      
Revenue £ 1,236.0 £ 1,313.5 £ 2,703.4
Revenue less pass-through costs [4] 946.0 996.7 2,052.1
Headline PBIT [3] £ 112.3 £ 129.2 £ 350.3
Headline PBIT margin [5] 11.90% 13.00% 17.10%
Public relations & public affairs [member]      
Disclosure of operating segments [line items]      
Revenue £ 581.1 £ 597.4 £ 1,204.0
Revenue less pass-through costs [4] 550.6 567.9 1,140.6
Headline PBIT [3] £ 85.2 £ 79.7 £ 183.2
Headline PBIT margin [5] 15.50% 14.00% 16.10%
Brand consulting, health & wellness and specialist communications [member]      
Disclosure of operating segments [line items]      
Revenue £ 2,234.5 £ 2,169.4 £ 4,528.1
Revenue less pass-through costs [4] 2,013.3 1,963.3 4,087.6
Headline PBIT [3] £ 242.9 £ 241.3 £ 624.6
Headline PBIT margin [5] 12.10% 12.30% 15.30%
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.
[2] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.
[3] A reconciliation from profit before interest and taxation (PBIT) to headline PBIT is provided in note 21.
[4] 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 5 for more details of the pass-through costs.
[5] Headline PBIT margin is calculated as headline PBIT (defined above) as a percentage of revenue less pass-through costs. Previously referred to as revenue less pass-through costs margin.