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Segmental analysis - Contributions by reportable segments (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of operating segments [line items]    
Revenue £ 6,755.3 £ 6,132.5
Revenue less pass-through costs
Headline operating profit 639.1 590.4
Reportable segments | Operating segments | Global Integrated Agencies    
Disclosure of operating segments [line items]    
Revenue 5,701.0 5,202.9
Revenue less pass-through costs 4,538.2 4,097.3
Headline operating profit 507.5 488.6
Reportable segments | Operating segments | Public Relations    
Disclosure of operating segments [line items]    
Revenue 572.4 449.9
Revenue less pass-through costs 545.4 429.4
Headline operating profit 83.0 63.5
Reportable segments | Operating segments | Specialist Agencies    
Disclosure of operating segments [line items]    
Revenue 481.9 479.7
Revenue less pass-through costs 425.9 372.5
Headline operating profit £ 48.6 £ 38.3