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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, 2022
Jun. 30, 2021
Costs of service and general and administrative costs [Abstract]    
Costs of services £ 5,708.1 £ 5,196.1
General and administrative costs 508.5 452.8
Costs of services and general and administrative costs 6,216.6 5,648.9
Costs of services and general and administrative costs include:    
Staff costs 3,930.7 3,473.3
Establishment costs 262.8 264.8
Media pass-through costs 1,016.7 857.0
Other costs of services and general and administrative costs 1,006.4 1,053.8
Costs of services and general and administrative costs 6,216.6 5,648.9
Other pass-through costs 229.1 376.3
Staff costs include:    
Wages and salaries 2,718.5 2,329.8
Cash-based incentive plans 93.5 200.2
Share-based incentive plans 67.3 43.9
Severance 17.4 14.5
Other staff costs 1,034.0 884.9
Staff costs 3,930.7 3,473.3
Other costs of services and general and administrative costs include:    
Amortisation and impairment of acquired intangible assets 31.5 30.1
Losses on disposal of investments and subsidiaries 48.1 1.0
Gains (losses) on remeasurement of equity interests arising from change in scope of ownership (60.4) 0.0
Restructuring and transformation costs 75.3 34.3
Restructuring costs in relation to COVID-19 5.9 19.7
Litigation settlement £ 0.0 £ 21.7