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Costs of services and general and administrative costs - Summary of Operating Costs (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Analysis of income and expense [abstract]      
Costs of services £ 6,218.7 £ 6,282.3 [1],[2] £ 12,629.0 [1],[2]
General and administrative costs 432.1 643.7 [1],[2] 1,267.0 [1],[2]
Costs of services and general and administrative costs 6,650.8 6,926.0 [2] 13,896.0 [2]
Costs of services and general and administrative costs include:      
Staff costs 4,032.6 4,177.0 [2] 8,319.0 [2]
Establishment costs 433.7 443.9 [2] 888.6 [2]
Media pass-through costs 740.9 701.6 [2] 1,429.4 [2]
Data collection pass-through costs 286.6 314.2 [2] 646.4 [2]
Other costs of services and general and administrative costs [3] 1,157.0 1,289.3 [2] 2,612.6 [2]
Costs of services and general and administrative costs 6,650.8 6,926.0 [2] 13,896.0 [2]
Staff costs include:      
Wages and salaries 2,805.4 2,919.1 5,832.3
Cash-based incentive plans 74.1 53.8 219.2
Share-based incentive plans 41.6 50.6 105.0
Social security costs 367.7 370.2 720.3
Pension costs 93.1 97.2 192.0
Severance 16.8 34.5 39.5
Other staff costs 633.9 651.6 1,210.7
Staff costs 4,032.6 4,177.0 [2] 8,319.0 [2]
Other costs of services and general and administrative costs include:      
Amortisation and impairment of acquired intangible assets 84.0 97.8 195.1
Goodwill impairment     27.1
Gains on disposal of investments and subsidiaries (189.9) (5.9) (129.0)
(Gains)/losses on remeasurement of equity interests arising from a change in scope of ownership (0.1) 0.2 0.3
Investment write-downs 1.5   95.9
Restructuring costs £ 45.5 £ 19.2 £ 56.8
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.
[2] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.
[3] Other costs of services and general and administrative costs include £316.3 million (period ended 30 June 2017: £258.5 million; year ended 31 December 2017: £558.8 million) of other pass-through costs.