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Segment information - Contributions by Reportable Segments (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Revenue [1] £ 13,234.1 £ 13,046.7 [2],[3] £ 13,146.4 [2],[3]
Headline PBIT (as above) [4] 1,560.6 1,651.2 [3] 1,793.1 [3]
Share-based payments 66.0 78.3 [3] 98.3 [3]
Capital additions [5] 329.8 314.0 [3] 271.0
Depreciation and amortisation [6] 508.3 209.3 [3] 209.1
Goodwill impairment [7] 47.7 176.5 [3] 27.1 [3]
Share of results of associates [2] 14.7 30.5 [3] 98.0 [3]
Interests in associates and joint ventures [2] 813.0 796.8 1,065.2
Global integrated agencies [Member]      
Disclosure of operating segments [line items]      
Revenue [1],[8] 10,205.2 9,930.7 [9] 10,028.6 [9]
Revenue less pass-through costs [8],[10] 8,108.1 8,070.8 [9] 8,315.5 [9]
Headline PBIT (as above) [4],[8] £ 1,219.5 £ 1,228.2 [9] £ 1,321.3 [9]
Headline PBIT margin [8],[11] 15.00% 15.20% [9] 15.90% [9]
Share-based payments £ 54.3 £ 59.5 [3] £ 77.8 [3]
Capital additions [5] 265.6 255.6 [3] 214.3 [3]
Depreciation and amortisation [6] 392.8 159.1 [3] 157.1 [3]
Goodwill impairment [12] 4.8 142.8 0.0
Share of results of associates 17.0 25.4 [3] 16.2 [3]
Interests in associates and joint ventures 164.2 175.1 [3] 179.9 [3]
Public relations [member]      
Disclosure of operating segments [line items]      
Revenue [1],[13] 956.5 931.7 [9] 915.0 [9]
Revenue less pass-through costs [10],[13] 898.0 879.9 [9] 864.3 [9]
Headline PBIT (as above) [4],[13] £ 140.6 £ 139.2 [9] £ 123.5 [9]
Headline PBIT margin [11],[13] 15.70% 15.80% [9] 14.30% [9]
Share-based payments £ 4.6 £ 7.1 [3] £ 7.2 [3]
Capital additions [5] 17.5 12.5 [3] 9.5 [3]
Depreciation and amortisation [6] 31.5 10.8 [3] 9.8 [3]
Goodwill impairment [12] 0.0 0.0 7.5
Share of results of associates (0.3) 1.3 [3] 0.9 [3]
Interests in associates and joint ventures 5.5 6.2 [3] 5.6 [3]
Specialist agencies [Member]      
Disclosure of operating segments [line items]      
Revenue [1],[14] 2,072.4 2,184.3 [9] 2,202.8 [9]
Revenue less pass-through costs [10],[14] 1,840.4 1,925.0 [9] 1,964.3 [9]
Headline PBIT (as above) [4],[14] £ 200.5 £ 283.8 [9] £ 348.3 [9]
Headline PBIT margin [11],[14] 10.90% 14.70% [9] 17.70% [9]
Share-based payments [15] £ 7.1 £ 11.7 [3] £ 13.3 [3]
Capital additions [5],[15] 46.7 45.9 [3] 47.2 [3]
Depreciation and amortisation [6],[15] 84.0 39.4 [3] 42.2 [3]
Goodwill impairment [12] 42.9 33.7 19.6
Share of results of associates [15] (2.0) 3.8 [3] 80.9 [3]
Interests in associates and joint ventures [15] £ 643.3 £ 615.5 [3] £ 879.7 [3]
[1] Intersegment sales have not been separately disclosed as they are not material.
[2] Figures have been restated, as described in the accounting policies.
[3] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[4] A reconciliation from operating profit to headline operating profit is provided in note 32.
[5] Capital additions include purchases of property, plant and equipment and other intangible assets (including capitalised computer software).
[6] Depreciation of property, plant and equipment, depreciation of right-of-use assets and amortisation of other intangible assets.
[7] Figures in 2018 have been restated, as described in the accounting policies.
[8] Global Integrated Agencies includes all of Grey, GroupM, Hogarth, Ogilvy, VMLY&R and Wunderman Thompson.
[9] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies. As a result Data Investment Management is now excluded from the segment analysis.
[10] 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 changed 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.
[11] Headline operating profit margin is calculated as headline operating profit (defined above) as a percentage of revenue less pass-through costs.
[12] Goodwill impairment figures in 2018 have been restated, as described in the accounting policies.
[13] 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.
[14] Specialist Agencies represent the Group’s other agencies that specialise in certain areas, whether by region or range of services.
[15] Specialist Agencies includes the Kantar associate and amounts previously reported under the Data Investment Management segment.