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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
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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

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