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Finance and investment 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, 2019
Jun. 30, 2018
Dec. 31, 2018
Analysis of income and expense [abstract]      
Income from equity investments £ 9.3 £ 10.3 £ 15.4
Interest income 34.3 38.0 89.4
Finance and investment income 43.6 48.3 104.8
Net interest expense on pension plans 2.1 2.2 4.4
Interest on other long-term employee benefits 1.9 1.9 4.0
Interest payable and similar charges 133.5 130.1 280.9
Interest expense related to lease liabilities 51.7    
Finance costs 189.2 134.2 289.3
Movements in fair value of treasury instruments (24.9) 3.6 (12.4)
Revaluation of investments held at fair value through profit or loss 1.5 26.5 68.2
Revaluation of put options over non-controlling interests (25.4) 21.3 34.5
Revaluation of payments due to vendors (earnout agreements) (8.4) 29.7 82.6
Revaluation of financial instruments £ (57.2) £ 81.1 £ 172.9