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Our people - Summary of Geographical 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 geographical areas [line items] |  |  |
Average number of staff | 111,281 | 114,732 | 114,129
North America |  |  |
Disclosure of geographical areas [line items] |  |  |
Average number of staff | 22,474 | 23,562 | 23,740
United Kingdom |  |  |
Disclosure of geographical areas [line items] |  |  |
Average number of staff | 11,816 | 12,457 | 12,490
Western Continental Europe |  |  |
Disclosure of geographical areas [line items] |  |  |
Average number of staff | 22,533 | 23,580 | 22,717
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe |  |  |
Disclosure of geographical areas [line items] |  |  |
Average number of staff | 54,458 | 55,133 | 55,182

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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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