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Costs of services and general and administrative costs - Summary of Operating Costs (Detail) - GBP (£) £ in Millions | 6 Months Ended
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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.

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