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Segmental Analysis - Contributions by Geographical Area (Parenthetical) (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |  |  |
Revenue |  | £ 7,616.0 | £ 7,492.7 | £ 15,602.4
Headline operating profit | [1] | 729.6 | 782.9 | 1,962.1
Ongoing restructuring [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Revenue |  | 2,452.5 | 2,454.1 | 5,074.1
Revenue less pass-through costs |  | 2,041.3 | 2,038.6 | 4,236.7
Headline operating profit |  | £ 283.5 | £ 323.1 | £ 747.8
[1] | A reconciliation from operating profit to headline operating profit is provided in note 22.

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