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Costs of services and general and administrative costs - Additional Information (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Information About Operating Cost [line items]      
Adjustments for amortisation and impairment of acquired intangible assets continue operation £ 93.0 £ 728.0 £ 62.0
Other impairment charges 26.0 18.0 77.0
Impairments related to capitalized configuration and customization costs     29.0
Restructuring and transformation costs 251.0 196.0 219.0
Restructuring and transformation costs, IT Transformation Program 90.0 113.0 134.0
Restructuring and transformation costs in relation to the continuing restructuring plan 144.0 73.0 70.0
Property-related restructuring costs 26.0 232.0 18.0
Impairments loss recognized in property related costs 23.0 0.0 0.0
Impairment loss, right of use assets 1.0 129.0 18.0
Impairment charges included within restructuring costs 2.0 56.0 0.0
Gains (losses) on disposals of investments 322.0 7.0 (36.0)
Legal provision charges/(gains) 68.0 (11.0) 0.0
Amortisation and impairment      
Disclosure Of Information About Operating Cost [line items]      
Charge for the year 125.0 753.0  
FGS Global      
Disclosure Of Information About Operating Cost [line items]      
Gains (losses) on disposals of investments 275.0    
ERP System      
Disclosure Of Information About Operating Cost [line items]      
Restructuring and transformation costs 56.0 52.0 97.0
Transformation Costs      
Disclosure Of Information About Operating Cost [line items]      
Restructuring and transformation costs 29.0 38.0 0.0
Covid-19 Pandemic      
Disclosure Of Information About Operating Cost [line items]      
Restructuring costs due to covid nineteen pandemic 17.0 10.0 15.0
Brand names      
Disclosure Of Information About Operating Cost [line items]      
Impairment loss recognised in profit or loss, intangible assets other than goodwill 21.0 650.0 1.0
Brand Names No Longer In Use      
Disclosure Of Information About Operating Cost [line items]      
Impairment loss recognised in profit or loss, intangible assets other than goodwill   650.0 £ 1.0
Brand Names No Longer In Use | Burson      
Disclosure Of Information About Operating Cost [line items]      
Impairment loss recognised in profit or loss, intangible assets other than goodwill 20.0    
Acquired intangibles | Amortisation and impairment      
Disclosure Of Information About Operating Cost [line items]      
Charge for the year £ 93.0 £ 728.0