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Finance and investment income, finance costs and revaluation and retranslation of financial instruments - Summary of Finance Income, Finance Costs and Revaluation and Retranslation of Financial Instruments (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement [Line Items] |  |  |  |  |  |
Income from equity investments | [1] | £ 18.3 | £ 15.4 |  | £ 16.8 |
Net interest expense on pension plans |  | 3.5 | 3.6 | [2] | 5.4 | [2]
Interest expense related to lease liabilities | [1] | 105.1 |  |  |  |
Finance costs | [1] | 359.1 | 279.1 | [2] | 261.9 | [2]
Revaluation and retranslation of financial instruments | [3] | 163.8 | (76.3) | [2] | 391.0 | [2]
Continuing Operations [member] |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |
Income from equity investments |  | 18.3 | 15.2 | [2] | 16.7 | [2]
Interest income |  | 80.7 | 83.7 | [2] | 72.3 | [2]
Finance income |  | 99.0 | 98.9 | [2] | 89.0 | [2]
Net interest expense on pension plans |  | 3.5 | 3.6 | [2] | 5.4 | [2]
Interest on other long-term employee benefits |  | 3.9 | 3.5 | [2] | 3.3 | [2]
Interest expense and similar charges | [4] | 252.0 | 272.0 | [2] | 253.2 | [2]
Interest expense related to lease liabilities | [4] | 99.7 |  |  |  |
Finance costs |  | 359.1 | 279.1 | [2] | 261.9 | [2]
Movements in fair value of treasury instruments | [3] | 0.4 | (11.0) | [2] | 0.4 | [2]
Premium on the early repayment of bonds | [3] | (63.4) |  |  |  |
Revaluation of investments held at fair value through profit or loss | [3] | 9.1 | 67.8 | [2] |  |
Revaluation of put options over non-controlling interests | [3] | (24.3) | 25.9 | [2] | 39.5 | [2]
Revaluation of payments due to vendors (earnout agreements) | [3] | (3.7) | 46.1 | [2] | 156.5 | [2]
Revaluation and retranslation of financial instruments | [3] | £ 245.7 | £ (205.1) | [2] | £ 194.6 | [2]
[1] | Figures have been restated, as described in the accounting policies.
[2] | Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[3] | Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.
[4] | Interest expense and similar charges are payable on bank overdrafts, bonds and bank loans held at amortised cost.

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