v3.26.1
Operating profit - Information about the nature and cost of services (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
employee
Dec. 31, 2024
USD ($)
employee
Dec. 31, 2023
USD ($)
employee
Disclosure of operating profit [line items]      
Wages and salaries $ 1,671.0 $ 1,663.0 $ 1,683.0
Social security costs 255.0 244.0 242.0
Pension costs (including retirement healthcare) 94.0 95.0 95.0
Share-based payments 43.0 40.0 39.0
Staff costs $ 2,063.0 $ 2,042.0 $ 2,059.0
Average number of employees | employee 17,530 18,060 19,081
Audit services:      
Group accounts $ 7.3 $ 7.1 $ 7.9
Local statutory audit pursuant to legislation 2.1 2.0 2.1
Audit related services 0.6 0.4 0.3
Total auditor's remuneration 10.0 9.5 10.3
United Kingdom      
Audit services:      
Total auditor's remuneration 7.4 7.0 6.0
Outside the UK      
Audit services:      
Total auditor's remuneration $ 2.6 $ 2.5 $ 4.3