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Costs of services and general and administrative costs - Summary of Operating Costs (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]      
Costs of services [1] £ 10,825.1 £ 10,559.1 [2] £ 10,481.6 [2]
General and administrative costs [1] 1,113.1 1,242.3 [2] 1,086.9 [2]
Costs of services and general and administrative costs 11,938.2 11,801.4 11,568.5
Costs of services and general and administrative costs include:      
Staff costs (note 5) 7,090.6 6,950.6 [2] 7,065.1 [2]
Establishment costs 672.9 756.6 769.5
Media pass-through costs 1,656.2 1,458.0 1,429.4
Other costs of services and general and administrative costs [3] 2,518.5 2,636.2 2,304.5
Goodwill impairment (note 14) [4] 47.7 176.5 [2] 27.1 [2]
Investment write-downs 7.5 2.0 91.7
Restructuring and transformation costs 153.5 265.5 56.8
Litigation settlement (16.8)    
Gain on sale of freehold property in New York [1] (7.9)    
Amortisation and impairment of acquired intangible assets 121.5 201.8 138.0
Amortisation of other intangible assets 21.2 20.7 20.1
Depreciation of property, plant and equipment 185.5 188.6 189.0
Depreciation of right-of-use assets 301.6    
Losses on sale of property, plant and equipment 3.2 0.6 1.2
Gains on disposal of investments and subsidiaries (40.4) (237.9) (98.7)
(Gains)/losses on remeasurement of equity interests arising from a change in scope of ownership (0.4) (2.0) 0.3
Net foreign exchange losses/(gains) 6.1 £ (13.0) £ 8.0
Short-term lease expense 83.8    
Low-value lease expense £ 2.9    
[1] Figures have been restated, as described in the accounting policies.
[2] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[3] Other costs of services and general and administrative costs include £731.4 million (2018: £713.0 million, 2017: £573.1 million) of other pass-through costs.
[4] Figures in 2018 have been restated, as described in the accounting policies.