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Segment analysis - Contributions by Geographical Area (Parenthetical) (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of geographical areas [line items]    
Revenue £ 6,132.5 £ 5,582.7 [1],[2]
Headline operating profit [3] 590.4 382.3 [1]
United States [member]    
Disclosure of geographical areas [line items]    
Revenue 2,046.9 2,065.2
Revenue less pass-through costs 1,695.9 1,757.5
Headline operating profit £ 254.1 £ 207.1
[1] During 2020, the Group announced the intention to combine Grey and AKQA into AKQA Group, and to bring Geometry and GTB into VMLY&R, and International Healthcare into VMLY&R and Ogilvy. As a result AKQA, Geometry, GTB and International Healthcare are now reported within Global Integrated Agencies, having previously been reported within Specialist Agencies. Prior year figure have been re-presented to reflect these changes.
[2] Figures have been restated as described in the accounting policies.
[3] A reconciliation from operating profit/(loss) to headline operating profit is provided in note 20.