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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, 2021
Jun. 30, 2020
Analysis of income and expense [abstract]    
Costs of services £ 5,196.1 £ 4,804.7 [1]
General and administrative costs 452.8 3,528.6 [1]
Costs of services and general and administrative costs 5,648.9 8,333.3 [1]
Costs of services and general and administrative costs include:    
Staff costs 3,473.3 3,330.0 [1]
Establishment costs 264.8 314.4 [1]
Media pass-through costs 857.0 613.7 [1]
Other costs of services and general and administrative costs [2] 1,053.8 4,075.2 [1]
Wages and salaries 2,329.8 2,417.5
Cash-based incentive plans 200.2 17.2
Share-based incentive plans 43.9 30.6
Severance 14.5 18.8
Other staff costs 884.9 845.9
Staffing costs 3,473.3 3,330.0 [1]
Amortisation and impairment of acquired intangible assets 30.1 53.1 [1]
Goodwill impairment 2,812.9 [1]
Losses/(gains) on disposal of investments and subsidiaries 1.0 (16.0) [1]
Investment and other write-downs 225.7 [1]
Restructuring and transformation costs 34.3 17.9 [1]
Restructuring costs in relation to Covid-19 19.7 39.3 [1]
Litigation settlement £ 21.7 [1]
[1] Figures have been restated as described in the accounting policies.
[2] Other costs of services and general and administrative costs include £376.3 million (period ended 30 June 2020: £301.3 million) of other pass-through costs.