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Segment information - Contributions by Geographical Area (Detail) - GBP (£)
£ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Disclosure of geographical areas [line items]

Revenue

^[1],[2]

£ 15,602.4

£ 15,804.2

£ 14,887.3

Headline PBIT

^[3]

2,047.3

2,267.1

2,160.3

Non-current assets

^[4]

17,762.9

18,343.6

North America [member]

Disclosure of geographical areas [line items]

Revenue

5,371.0

5,659.2

5,400.9

Revenue less pass-through costs

4,474.2

4,793.9

4,598.4

Headline PBIT

£ 804.0

£ 937.4

£ 895.4

Headline PBIT margin

18.00%

19.60%

19.50%

Non-current assets

^[4],[5]

£ 7,269.7

£ 7,667.5

United Kingdom [member]

Disclosure of geographical areas [line items]

Revenue

2,189.4

2,133.4

£ 1,970.7

Revenue less pass-through costs

1,691.3

1,688.0

1,590.2

Headline PBIT

£ 244.6

£ 280.0

£ 261.4

Headline PBIT margin

14.50%

16.60%

16.40%

Non-current assets

^[4]

£ 2,079.2

£ 2,098.2

Western Continental Europe [member]

Disclosure of geographical areas [line items]

Revenue

3,335.3

3,230.6

£ 3,008.5

Revenue less pass-through costs

2,735.4

2,630.6

2,438.3

Headline PBIT

£ 372.7

£ 376.0

£ 351.7

Headline PBIT margin

13.60%

14.30%

14.40%

Non-current assets

^[4]

£ 4,385.6

£ 4,542.1

Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member]

Disclosure of geographical areas [line items]

Revenue

4,706.7

4,781.0

£ 4,507.2

Revenue less pass-through costs

3,925.7

4,057.1

3,801.7

Headline PBIT

£ 626.0

£ 673.7

£ 651.8

Headline PBIT margin

15.90%

16.60%

17.10%

Non-current assets

^[4]

£ 4,028.4

£ 4,035.8

[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.
[3]	A reconciliation from profit before interest and taxation to headline PBIT is provided in note 29. PBIT is reconciled to reported profit before taxation in the consolidated income statement.
[4]	Non-current assets excluding financial instruments and deferred tax.
[5]	North America includes the US with non-current assets of £6,791.9 million (2017: £7,202.7 million).

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