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Segment information - Contributions by Reportable Segments (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Revenue [1],[2] £ 15,602.4 £ 15,804.2 £ 14,887.3
Headline PBIT [3] 2,047.3 2,267.1 2,160.3
Share-based payments 84.8 105.0 106.5
Capital additions [1],[4] 375.2 326.2 285.1
Depreciation and amortisation [1],[5] 263.8 267.0 259.4
Goodwill impairment 183.9 27.1 27.0
Share of results of associates 43.5 113.5 [2] 49.8 [2]
Interests in associates and joint ventures 796.8 1,065.2 1,069.4
Advertising and media investment management [member]      
Disclosure of operating segments [line items]      
Revenue [1],[2] 7,132.4 7,368.7 6,709.4
Revenue less pass-through costs [2],[6] 5,529.7 5,889.3 5,450.9
Headline PBIT [3] £ 972.4 £ 1,109.0 £ 1,027.2
Headline PBIT margin [7] 17.60% 18.80% 18.80%
Share-based payments £ 41.9 £ 57.0 £ 60.7
Capital additions [1],[4] 190.8 171.3 126.2
Depreciation and amortisation [1],[5] 111.8 108.8 105.4
Goodwill impairment 148.0 19.5 20.9
Share of results of associates 16.6 27.0 8.3
Interests in associates and joint ventures 203.4 193.1 285.6
Data investment management [member]      
Disclosure of operating segments [line items]      
Revenue [1],[2] 2,582.5 2,703.4 2,672.4
Revenue less pass-through costs [2],[6] 1,965.4 2,052.1 1,994.0
Headline PBIT [3] £ 301.1 £ 350.3 £ 351.5
Headline PBIT margin [7] 15.30% 17.10% 17.60%
Share-based payments £ 12.8 £ 14.4 £ 13.0
Capital additions [1],[4] 68.9 58.8 61.5
Depreciation and amortisation [1],[5] 56.6 59.9 60.9
Goodwill impairment 0.9    
Share of results of associates 12.5 15.3 13.2
Interests in associates and joint ventures 113.1 106.3 109.4
Public relations & public affairs [member]      
Disclosure of operating segments [line items]      
Revenue [1],[2] 1,210.7 1,204.0 1,130.6
Revenue less pass-through costs [2],[6] 1,136.3 1,140.6 1,078.5
Headline PBIT [3] £ 183.7 £ 183.2 £ 179.8
Headline PBIT margin [7] 16.20% 16.10% 16.70%
Share-based payments £ 8.3 £ 8.6 £ 7.5
Capital additions [1],[4] 13.4 10.6 10.3
Depreciation and amortisation [1],[5] 13.8 12.2 11.6
Goodwill impairment   7.6  
Share of results of associates 5.2 6.3 3.2
Interests in associates and joint ventures 39.5 34.2 108.1
Brand consulting, health & wellness and specialist communications [member]      
Disclosure of operating segments [line items]      
Revenue [1],[2] 4,676.8 4,528.1 4,374.9
Revenue less pass-through costs [2],[6] 4,195.2 4,087.6 3,905.2
Headline PBIT [3] £ 590.1 £ 624.6 £ 601.8
Headline PBIT margin [7] 14.10% 15.30% 15.40%
Share-based payments £ 21.8 £ 25.0 £ 25.3
Capital additions [1],[4] 102.1 85.5 87.1
Depreciation and amortisation [1],[5] 81.6 86.1 81.5
Goodwill impairment 35.0   6.1
Share of results of associates 9.2 64.9 25.1
Interests in associates and joint ventures £ 440.8 £ 731.6 £ 566.3
[1] Intersegment sales have not been separately disclosed as they are not material.
[2] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.
[3] A reconciliation from profit before interest and taxation to headline PBIT is provided in note 29. PBIT is reconciled to reported profit before taxation in the consolidated income statement.
[4] Capital additions include purchases of property, plant and equipment and other intangible assets (including capitalised computer software).
[5] Depreciation of property, plant and equipment and amortisation of other intangible assets.
[6] 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 3 to the consolidated financial statements for more details of the pass-through costs.
[7] 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.