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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]

£ 13,146.4

^[2]

Headline PBIT

^[3]

1,560.6

1,651.2

^[2]

1,793.1

^[2]

Non-current assets

15,698.9

17,762.9

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

£ 6,373.9

£ 6,791.9

[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.
[3]	A reconciliation from operating profit to headline operating profit is provided in note 32

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