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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
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Analysis of income and expense [abstract]      
Income from equity investments £ 10.3 £ 5.4 £ 16.8
Interest income 38.0 39.5 78.4
Finance income 48.3 44.9 95.2
Net interest expense on pension plans 2.2 3.3 6.3
Interest on other long-term employee benefits 1.9 1.7 3.9
Interest payable and similar charges 130.1 128.5 259.6
Finance costs 134.2 133.5 269.8
Movements in fair value of treasury instruments 3.6 5.0 1.1
Revaluation of investments held at fair value through profit or loss 26.5    
Revaluation of put options over non-controlling interests 21.3 9.5 52.5
Revaluation of payments due to vendors (earnout agreements) 29.7 69.4 208.6
Revaluation of financial instruments £ 81.1 £ 83.9 £ 262.2