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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.

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