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Segment information - Contributions by Geographical Area (Parenthetical) (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [line items]      
Revenue [1],[2] £ 15,602.4 £ 15,804.2 £ 14,887.3
Headline PBIT [3] 2,047.3 2,267.1 2,160.3
Non-current assets [4] 17,762.9 18,343.6  
United States [member]      
Disclosure of geographical areas [line items]      
Revenue 5,074.1 5,336.3 5,107.2
Revenue less pass-through costs 4,236.7 4,535.3 4,359.7
Headline PBIT 761.6 890.3 £ 849.4
Non-current assets £ 6,791.9 £ 7,202.7  
[1] Intersegment sales have not been separately disclosed as they are not material.
[2] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.
[3] A reconciliation from profit before interest and taxation to headline PBIT is provided in note 29. PBIT is reconciled to reported profit before taxation in the consolidated income statement.
[4] Non-current assets excluding financial instruments and deferred tax.