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Costs of services and general and administrative costs - Summary of Operating Costs (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Costs of service and general and administrative costs [Abstract]    
Costs of services £ 6,157.0 £ 5,708.1
General and administrative costs 758.1 508.5
Costs of services and general and administrative costs 6,915.1 6,216.6
Costs of services and general and administrative costs include:    
Staff costs 4,141.5 3,930.7
Establishment costs 272.1 262.8
Media pass-through costs 1,022.8 1,016.7
Other costs of services and general and administrative costs 1,478.7 1,006.4
Costs of services and general and administrative costs 6,915.1 6,216.6
Other pass-through costs 387.2 229.1
Staff costs include:    
Wages and salaries 2,944.0 2,718.5
Cash-based incentive plans 91.7 93.5
Share-based incentive plans 75.5 67.3
Severance 40.1 17.4
Other staff costs 990.2 1,034.0
Staff costs 4,141.5 3,930.7
Other costs of services and general and administrative costs include:    
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 86.8 81.2
Property related costs 180.0 0.0
Litigation settlement £ (10.0) £ 0.0