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Segment information - Contributions by Geographical Area (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
 [2]
Disclosure of geographical areas [line items]      
Revenue [1] £ 13,234.1 £ 13,046.7 [2] £ 13,146.4
Headline PBIT [3] 1,560.6 1,651.2 [2] 1,793.1
Non-current assets 15,698.9 17,762.9  
North America [member]      
Disclosure of geographical areas [line items]      
Revenue [1],[4] 4,854.7 4,851.7 [2] 5,083.5
Revenue less pass-through costs [4],[5] 4,034.3 4,059.7 [2] 4,335.2
Headline PBIT [3],[4] £ 662.0 £ 710.6 [2] £ 816.3
Headline PBIT margin [6] 16.40% 17.50% [2] 18.80%
Non-current assets £ 6,833.1 £ 7,269.7  
United Kingdom [member]      
Disclosure of geographical areas [line items]      
Revenue [1] 1,797.1 1,785.6 [2] £ 1,737.4
Revenue less pass-through costs [5] 1,390.1 1,393.8 [2] 1,390.0
Headline PBIT [3] £ 188.5 £ 179.6 [2] £ 218.1
Headline PBIT margin [6] 13.60% 12.90% [2] 15.70%
Non-current assets £ 1,754.6 £ 2,079.2  
Western Continental Europe [member]      
Disclosure of geographical areas [line items]      
Revenue [1] 2,628.8 2,589.6 [2] £ 2,455.7
Revenue less pass-through costs [5] 2,176.4 2,182.9 [2] 2,063.7
Headline PBIT [3] £ 261.5 £ 289.4 [2] £ 249.8
Headline PBIT margin [6] 12.00% 13.30% [2] 12.10%
Non-current assets £ 3,429.8 £ 4,385.6  
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member]      
Disclosure of geographical areas [line items]      
Revenue [1] 3,953.5 3,819.8 [2] £ 3,869.8
Revenue less pass-through costs [5] 3,245.7 3,239.3 [2] 3,355.0
Headline PBIT [3] £ 448.6 £ 471.6 [2] £ 508.9
Headline PBIT margin [6] 13.80% 14.60% [2] 15.20%
Non-current assets £ 3,681.4 £ 4,028.4  
[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] North America includes the US with revenue of £4,576.5 million (2018: £4,576.1 million, 2017: £4,782.0 million), revenue less pass-through costs of £3,806.3 million (2018: £3,836.0 million, 2017: £4,089.9 million) and headline operating profit of £620.6 million (2018: £674.4 million, 2017: £773.5 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 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.
[6] Headline operating profit margin is calculated as headline operating profit (defined above) as a percentage of revenue less pass-through costs.