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Costs of services and general and administrative costs - Additional Information (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Disclosure Of Information About Operating Cost [line items]    
Amortisation and impairment of acquired intangible assets £ 36.6 £ 31.5
Goodwill impairment 52.9 0.0
Investment and other impairment charges 11.0 0.0
Losses on disposal of investments and subsidiaries 2.9 48.1
Gains on remeasurement of equity interests arising from a change in scope of ownership 0.0 60.4
Restructuring and transformation costs in relation to the continuing restructuring plan 86.8 81.2
Capitalised costs 23.8 46.3
Restructuring and transformation costs 86.8 81.2
Restructuring costs in relation to COVID-19 180.0 0.0
Transformation costs 25.9 15.8
ERP System    
Disclosure Of Information About Operating Cost [line items]    
Restructuring and transformation costs 15.2 0.0
Covid19 Pandemic    
Disclosure Of Information About Operating Cost [line items]    
Restructuring costs in relation to COVID-19 7.0 5.9
Russian Interest    
Disclosure Of Information About Operating Cost [line items]    
Losses on disposals of investments   65.1
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 1.7 1.3
Investor Day    
Disclosure Of Information About Operating Cost [line items]    
Restructuring and transformation costs in relation to the continuing restructuring plan £ 53.9 £ 59.5