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Segmental analysis - Contributions by Reportable Segments (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
 [1]
Dec. 31, 2019
Disclosure of operating segments [line items]      
Revenue £ 5,582.7 £ 6,368.2 £ 13,234.1
Headline operating profit [2] 382.3 617.3 1,560.6
Global integrated agencies [Member]      
Disclosure of operating segments [line items]      
Revenue 4,249.2 4,873.6 10,205.2
Revenue less pass-through costs [3] 3,461.5 3,858.1 8,108.1
Headline operating profit [2] 256.0 463.5 1,219.5
Public relations [member]      
Disclosure of operating segments [line items]      
Revenue 446.8 471.5 956.5
Revenue less pass-through costs [3] 426.3 442.2 898.0
Headline operating profit [2] 71.9 67.9 140.6
Specialist agencies [Member]      
Disclosure of operating segments [line items]      
Revenue 886.7 1,023.1 2,072.4
Revenue less pass-through costs [3] 779.9 899.1 1,840.4
Headline operating profit [2] £ 54.4 £ 85.9 £ 200.5
[1] Figures for the period ended 30 June 2019 have been re-presented in accordance with IFRS 5: Non-current Assets Held for Sale and Discontinued Operations, as described in note 13.
[2] A reconciliation from operating (loss)/profit to headline operating profit is provided in note 23.
[3] Revenue less pass-through costs is revenue less media and other pass-through costs. Pass-through costs comprise fees paid to external suppliers where they are engaged to perform part or all of a specific project and are charged directly to clients, predominantly media costs. See note 4 for more details of the pass-through costs.