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Segmental analysis - Contributions by Reportable Segments (Details) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of operating segments [line items]    
Revenue £ 6,663 £ 7,227
Revenue less pass-through costs 5,026 5,599
Headline operating profit 412 646
Adjusting items within IFRS operating profit (191) (223)
Financing items (140) (101)
Earnings from associates 17 16
Profit before taxation 98 338
Reportable segments | Operating segments | Global Integrated Agencies    
Disclosure of operating segments [line items]    
Revenue 5,871 6,117
Revenue less pass-through costs 4,302 4,595
Headline operating profit 352 551
Reportable segments | Operating segments | Public Relations    
Disclosure of operating segments [line items]    
Revenue 351 601
Revenue less pass-through costs 335 568
Headline operating profit 39 80
Reportable segments | Operating segments | Specialist Agencies    
Disclosure of operating segments [line items]    
Revenue 441 509
Revenue less pass-through costs 389 436
Headline operating profit £ 21 £ 15