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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, 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

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