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Segment information - Contributions by Geographical Area (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of geographical areas [line items]      
Revenue £ 14,741,000 £ 14,845,000 £ 14,429,000
Revenue less pass-through costs
Headline operating profit 1,707,000 1,750,000 1,742,000
Adjusting items within IFRS operating profit (382,000) (1,219,000) (384,000)
Financing items (330,000) (255,000) (138,000)
Earnings/(losses) from associates 36,000 70,000 (60,000)
Profit before taxation 1,031,000 346,000 1,160,000
Non-current assets 11,521,000 12,323,000  
North America      
Disclosure of geographical areas [line items]      
Revenue 5,567,000 5,528,000 5,550,000
Revenue less pass-through costs 4,394,000 4,556,000 4,688,000
Headline operating profit 825,000 834,000 771,000
Non-current assets 4,736,000 5,218,000  
United Kingdom      
Disclosure of geographical areas [line items]      
Revenue 2,185,000 2,155,000 2,004,000
Revenue less pass-through costs 1,588,000 1,626,000 1,537,000
Headline operating profit 237,000 215,000 187,000
Non-current assets 1,666,000 1,670,000  
Western Continental Europe      
Disclosure of geographical areas [line items]      
Revenue 3,013,000 3,037,000 2,876,000
Revenue less pass-through costs 2,375,000 2,411,000 2,319,000
Headline operating profit 259,000 258,000 301,000
Non-current assets 2,512,000 2,696,000  
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe      
Disclosure of geographical areas [line items]      
Revenue 3,976,000 4,125,000 3,999,000
Revenue less pass-through costs 3,002,000 3,267,000 3,256,000
Headline operating profit 386,000 443,000 483,000
Non-current assets 2,607,000 2,739,000  
United States      
Disclosure of geographical areas [line items]      
Revenue 5,203,000 5,187,000 5,231,000
Revenue less pass-through costs 4,115,000 4,271,000 4,402,000
Headline operating profit 766,000 785,000 £ 726,000
Non-current assets £ 4,427,000 £ 5,114,000