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Segmental analysis - Contributions by Reportable Segments (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
Revenue | £ 14,741 | £ 14,845 | £ 14,429
Revenue less pass-through costs |  |  |
Headline operating profit | 1,707 | 1,750 | 1,742
Adjusting items within IFRS operating profit | (382) | (1,219) | (384)
Financing items | (330) | (255) | (138)
Earnings/(losses) from associates | 36 | 70 | (60)
Profit before taxation | 1,031 | 346 | 1,160
Reportable Segments | Operating Segments | Global Integrated Agencies |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 12,562 | 12,532 | 12,133
Revenue less pass-through costs | 9,384 | 9,751 | 9,684
Headline operating profit | 1,482 | 1,480 | 1,427
Reportable Segments | Operating Segments | Public Relations |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1,156 | 1,262 | 1,233
Revenue less pass-through costs | 1,089 | 1,180 | 1,161
Headline operating profit | 166 | 191 | 192
Reportable Segments | Operating Segments | Specialist Agencies |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1,023 | 1,051 | 1,063
Revenue less pass-through costs | 886 | 929 | 955
Headline operating profit | £ 59 | £ 79 | £ 123

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