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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, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Statement [LineItems] |  |  |  |
Income from equity investments | £ 6.8 | £ 9.3 |  | £ 18.3
Interest expense related to lease liabilities | 48.6 | 51.7 |  | 105.1
Continuing Operation [member] |  |  |  |
Statement [LineItems] |  |  |  |
Income from equity investments | 6.8 | 9.3 | [1] | 18.3
Interest income | 44.4 | 32.5 | [1] | 80.7
Finance income | 51.2 | 41.8 | [1] | 99.0
Net interest expense on pension plans | 1.4 | 1.8 | [1] | 3.5
Interest on other long-term employee benefits | 1.4 | 1.8 | [1] | 3.9
Interest payable and similar charges | 104.3 | 127.8 | [1] | 252.0
Interest expense related to lease liabilities | 50.2 | 48.7 | [1] | 99.7
Finance costs | 157.3 | 180.1 | [1] | 359.1
Movements in fair value of treasury instruments | (2.0) | 7.3 | [1] | 0.4
Premium on the early repayment of bonds |  | (32.2) | [1] | (63.4)
Revaluation of investments held at fair value through profit or loss | 1.7 | 1.6 | [1] | 9.1
Revaluation of put options over non-controlling interests | 26.0 | (19.5) | [1] | (13.5)
Revaluation of payments due to vendors (earnout agreements) | 4.3 | (7.7) | [1] | (1.0)
Revaluation of financial instruments | £ 30.0 | £ (50.5) | [1] | £ (68.4)
[1] | Figures for the period ended 30 June 2019 have been re-presented in accordance with IFRS 5: Non-current Assets Held for Sale and Discontinued Operations, as described in note 13.

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