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Segmental Analysis - Contributions by Geographical Area (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disclosure of geographical areas [line items]      
Revenue £ 7,616.0 £ 7,492.7 £ 15,602.4
Headline operating profit [1] 729.6 782.9 1,962.1
North America [member]      
Disclosure of geographical areas [line items]      
Revenue [2] 2,592.3 2,598.1 5,371.0
Revenue less pass-through costs [3] 2,156.6 2,155.2 4,474.2
Headline operating profit [1] £ 301.1 £ 341.6 £ 788.7
Headline operating profit margin [4] 14.00% 15.90% 17.60%
United Kingdom [member]      
Disclosure of geographical areas [line items]      
Revenue £ 1,103.8 £ 1,091.5 £ 2,189.4
Revenue less pass-through costs [3] 831.2 832.9 1,691.3
Headline operating profit [1] £ 106.7 £ 107.3 £ 236.8
Headline operating profit margin [4] 12.80% 12.90% 14.00%
Western Continental Europe [member]      
Disclosure of geographical areas [line items]      
Revenue £ 1,625.0 £ 1,609.9 £ 3,335.3
Revenue less pass-through costs [3] 1,305.9 1,319.2 2,735.4
Headline operating profit [1] £ 118.6 £ 122.1 £ 346.9
Headline operating profit margin [4] 9.10% 9.30% 12.70%
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member]      
Disclosure of geographical areas [line items]      
Revenue £ 2,294.9 £ 2,193.2 £ 4,706.7
Revenue less pass-through costs [3] 1,855.2 1,841.6 3,925.7
Headline operating profit [1] £ 203.2 £ 211.9 £ 589.7
Headline operating profit margin [4] 11.00% 11.50% 15.00%
[1] A reconciliation from operating profit to headline operating profit is provided in note 22.
[2] North America includes the US with revenue of £2,452.5 million (period ended 30 June 2018: £2,454.1 million; year ended 31 December 2018: £5,074.1 million), revenue less pass-through costs of £2,041.3 million (period ended 30 June 2018: £2,038.6 million; year ended 31 December 2018: £4,236.7 million) and headline operating profit of £283.5 million (period ended 30 June 2018: £323.1 million; year ended 31 December 2018: £747.8 million).
[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.