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Segment information - Contributions by Geographical Area (Parenthetical) (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]      
Revenue [1] £ 13,234.1 £ 13,046.7 [2],[3] £ 13,146.4 [2],[3]
Headline PBIT [4] 1,560.6 1,651.2 [3] 1,793.1 [3]
Non-current assets [5] 15,638.8 17,692.7  
United States [member]      
Disclosure of geographical areas [line items]      
Revenue 4,576.5 4,576.1 4,782.0
Revenue less pass-through costs 3,806.3 3,836.0 4,089.9
Headline PBIT 620.6 674.4 £ 773.5
Non-current assets £ 6,354.7 £ 6,770.6  
[1] Intersegment sales have not been separately disclosed as they are not material.
[2] Figures have been restated, as described in the accounting policies.
[3] 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.
[4] A reconciliation from operating profit to headline operating profit is provided in note 32.
[5] Non-current assets excluding financial instruments and deferred tax.