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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
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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.

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