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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Income statement      
Revenue [1] £ 13,234.1 £ 13,046.7 [2] £ 13,146.4 [2]
Operating profit 1,295.9 1,237.9 1,577.9
Profit before taxation 982.1 1,257.6 1,746.9
Profit for the year 717.9 1,139.4 1,912.3
Balance sheet      
Net assets 8,443.5 9,806.6  
Associates and Joint Ventures [member]      
Income statement      
Revenue 3,619.1 3,685.8 3,800.8
Operating profit 365.6 378.4 440.4
Profit before taxation (385.9) 194.7 381.9
Profit for the year (429.6) 118.1 312.5
Balance sheet      
Assets 8,855.1 2,940.9 3,192.9
Liabilities (6,765.7) (1,570.6) (1,633.7)
Net assets £ 2,089.4 £ 1,370.3 £ 1,559.2
[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.