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Interests in associates, joint ventures and other investments - Summary of Aggregate Financial Performance and Net Asset Position of Associates and Joint Ventures (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income statement      
Revenue [1],[2] £ 15,602.4 £ 15,804.2 £ 14,887.3
Operating profit 1,431.4 1,908.2 [2] 2,063.1 [2]
Profit before taxation 1,463.3 2,109.3 [2] 1,890.5 [2]
Profit for the year 1,139.4 1,912.3 [2] 1,501.6 [2]
Balance sheet      
Net assets 9,806.6 9,956.1 [2]  
Associates and Joint Ventures [member]      
Income statement      
Revenue 3,685.8 3,800.8 2,254.5
Operating profit 378.4 440.4 308.3
Profit before taxation 194.7 381.9 237.2
Profit for the year 118.1 312.5 156.7
Balance sheet      
Assets 2,940.9 3,192.9 4,223.1
Liabilities (1,570.6) (1,633.7) (1,900.0)
Net assets £ 1,370.3 £ 1,559.2 £ 2,323.1
[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.