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Finance income, finance costs and revaluation of financial instruments - Summary of Finance Income, Finance Costs and Revaluation of Financial Instruments (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]      
Income from equity investments £ 15.4 £ 16.8 £ 12.5
Interest income 89.4 78.4 67.9
Finance income 104.8 95.2 [1] 80.4 [1]
Net interest expense on pension plans 4.4 6.3 6.7
Interest on other long-term employee benefits 4.0 3.9 2.7
Interest expense and similar charges 280.9 259.6 245.1
Finance costs 289.3 269.8 [1] 254.5 [1]
Movements in fair value of treasury instruments (12.4) 1.1 (19.5)
Revaluation of investments held at fair value through profit or loss 68.2    
Revaluation of put options over non-controlling interests 34.5 52.5 (17.2)
Revaluation of payments due to vendors (earnout agreements) 82.6 208.6 (11.6)
Revaluation of financial instruments £ 172.9 £ 262.2 £ (48.3)
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.