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Our people - Geographical Distribution of staff (Details) - number_of_employee
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of geographical areas [line items]      
Average number of staff 114,732 114,129 104,808
North America      
Disclosure of geographical areas [line items]      
Average number of staff 23,562 23,740 21,764
United Kingdom      
Disclosure of geographical areas [line items]      
Average number of staff 12,457 12,490 10,995
Western Continental Europe      
Disclosure of geographical areas [line items]      
Average number of staff 23,580 22,717 21,514
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe      
Disclosure of geographical areas [line items]      
Average number of staff 55,133 55,182 50,535