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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] | £ 13,146.4 | [2]
Headline PBIT (as above) | [3] | 1,560.6 | 1,651.2 | [2] | 1,793.1 | [2]
Share-based payments |  | 66.0 | 78.3 | [2] | 98.3 | [2]
Capital additions | [4] | 329.8 | 314.0 | [2] | 271.0 | [2]
Depreciation and amortisation | [5] | 508.3 | 209.3 | [2] | 209.1 | [2]
Goodwill impairment |  | 47.7 | 183.9 | [2] | 27.1 | [2]
Share of results of associates |  | 14.7 | 30.5 | [2] | 98.0 | [2]
Interests in associates and joint ventures |  | 813.0 | 796.8 | [2] | 1,065.2 | [2]
Global integrated agencies [Member] |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Revenue | [1],[6] | 10,205.2 | 9,930.7 | [7] | 10,028.6 | [7]
Revenue less pass-through costs | [6],[8] | 8,108.1 | 8,070.8 | [7] | 8,315.5 | [7]
Headline PBIT (as above) | [6] | £ 1,219.5 | £ 1,228.2 | [7],[9] | £ 1,321.3 | [7],[9]
Headline PBIT margin | [6],[9] | 15.00% | 15.20% | [7] | 15.90% | [7]
Share-based payments |  | £ 54.3 | £ 59.5 | [2] | £ 77.8 | [2]
Capital additions | [4] | 265.6 | 255.6 | [2] | 214.3 | [2]
Depreciation and amortisation | [5] | 392.8 | 159.1 | [2] | 157.1 | [2]
Goodwill impairment |  | 4.8 | 148.0 | [2] | 0.0 | [2]
Share of results of associates |  | 17.0 | 25.4 | [2] | 16.2 | [2]
Interests in associates and joint ventures |  | 164.2 | 175.1 | [2] | 179.9 | [2]
Public relations [member] |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Revenue | [1],[10] | 956.5 | 931.7 | [7] | 915.0 | [7]
Revenue less pass-through costs | [8],[10] | 898.0 | 879.9 | [7] | 864.3 | [7]
Headline PBIT (as above) | [10] | £ 140.6 | £ 139.2 | [7],[9] | £ 123.5 | [7],[9]
Headline PBIT margin | [9],[10] | 15.70% | 15.80% | [7] | 14.30% | [7]
Share-based payments |  | £ 4.6 | £ 7.1 | [2] | £ 7.2 | [2]
Capital additions | [4] | 17.5 | 12.5 | [2] | 9.5 | [2]
Depreciation and amortisation | [5] | 31.5 | 10.8 | [2] | 9.8 | [2]
Goodwill impairment |  | 0.0 | 0.0 | [2] | 7.5 | [2]
Share of results of associates |  | (0.3) | 1.3 | [2] | 0.9 | [2]
Interests in associates and joint ventures |  | 5.5 | 6.2 | [2] | 5.6 | [2]
Specialist agencies [Member] |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Revenue | [1],[11] | 2,072.4 | 2,184.3 | [7] | 2,202.8 | [7]
Revenue less pass-through costs | [8],[11] | 1,840.4 | 1,925.0 | [7] | 1,964.3 | [7]
Headline PBIT (as above) | [11] | £ 200.5 | £ 283.8 | [7],[9] | £ 348.3 | [7],[9]
Headline PBIT margin | [9],[11] | 10.90% | 14.70% | [7] | 17.70% | [7]
Share-based payments | [12] | £ 7.1 | £ 11.7 | [2] | £ 13.3 | [2]
Capital additions | [12] | 46.7 | 45.9 | [2] | 47.2 | [2],[4]
Depreciation and amortisation | [12] | 84.0 | 39.4 | [2],[5] | 42.2 | [2],[5]
Goodwill impairment | [12] | 42.9 | 35.9 | [2] | 19.6 | [2]
Share of results of associates | [12] | (2.0) | 3.8 | [2] | 80.9 | [2]
Interests in associates and joint ventures | [12] | £ 643.3 | £ 615.5 | [2] | £ 879.7 | [2]
[1] | Intersegment sales have not been separately disclosed as they are not material.
[2] | 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.
[3] | A reconciliation from operating profit to headline operating profit is provided in note 32
[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, depreciation of right-of-use assets and amortisation of other intangible assets.
[6] | Global Integrated Agencies includes all of Grey, GroupM, Hogarth, Ogilvy, VMLY&R and Wunderman Thompson.
[7] | 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.
[8] | 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.
[9] | Headline operating profit margin is calculated as headline operating profit (defined above) as a percentage of revenue less pass-through costs.
[10] | 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.
[11] | Specialist Agencies represent the Group’s other agencies that specialise in certain areas, whether by region or range of services.
[12] | Specialist Agencies includes the Kantar associate and amounts previously reported under the Data Investment Management segment.

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