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Segmental analysis - Contributions by Geographical Area (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
 [2]
Dec. 31, 2017
 [2]
Disclosure of geographical areas [line items]      
Revenue £ 7,492.7 £ 7,650.4 [1] £ 15,804.2 [1]
Headline PBIT [3] 820.7 882.0 2,267.1
North America [member]      
Disclosure of geographical areas [line items]      
Revenue [4] 2,598.1 2,818.5 5,659.2
Revenue less pass-through costs [4],[5] 2,155.2 2,407.2 4,793.9
Headline PBIT [3],[4] £ 348.1 £ 400.9 £ 937.4
Headline PBIT margin [4],[6] 16.20% 16.70% 19.60%
United Kingdom [member]      
Disclosure of geographical areas [line items]      
Revenue £ 1,091.5 £ 1,047.5 £ 2,133.4
Revenue less pass-through costs [5] 832.9 814.7 1,688.0
Headline PBIT [3] £ 109.7 £ 112.4 £ 280.0
Headline PBIT margin [6] 13.20% 13.80% 16.60%
Western Continental Europe [member]      
Disclosure of geographical areas [line items]      
Revenue £ 1,609.9 £ 1,525.5 £ 3,230.6
Revenue less pass-through costs [5] 1,319.2 1,236.5 2,630.6
Headline PBIT [3] £ 136.3 £ 153.1 £ 376.0
Headline PBIT margin [6] 10.30% 12.40% 14.30%
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member]      
Disclosure of geographical areas [line items]      
Revenue £ 2,193.2 £ 2,258.9 £ 4,781.0
Revenue less pass-through costs [5] 1,841.6 1,917.7 4,057.1
Headline PBIT [3] £ 226.6 £ 215.6 £ 673.7
Headline PBIT margin [6] 12.30% 11.20% 16.60%
[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] North America includes the US with revenue of £2,454.1 million (period ended 30 June 2017: £2,660.8 million; year ended 31 December 2017: £5,336.3 million), revenue less pass-through costs of £2,038.6 million (period ended 30 June 2017: £2,279.3 million; year ended 31 December 2017: £4,535.3 million) and headline PBIT of £328.9 million (period ended 30 June 2017: £382.2 million; year ended 31 December 2017: £937.4 million).
[5] 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.
[6] 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.