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Our people - Summary of Reportable Segment Distribution of Staff (Details) - number_of_employee | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
Average number of staff | 111,281 | 114,732 | 114,129
Global Integrated Agencies |  |  |
Disclosure of operating segments [line items] |  |  |
Average number of staff | 95,053 | 97,838 | 97,288
Public Relations |  |  |
Disclosure of operating segments [line items] |  |  |
Average number of staff | 7,742 | 8,377 | 8,125
Specialist Agencies |  |  |
Disclosure of operating segments [line items] |  |  |
Average number of staff | 8,486 | 8,517 | 8,716

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- Definition The average number of personnel employed by the entity during a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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