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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

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_b&doctype=Standard -URIDate 2018-03-16 + Details
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