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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement [Line Items] |  |  |  |  |  |
Income from equity investments |  | £ 18.3 | £ 15.4 |  | £ 16.8 |
Net interest expense on pension plans |  | 3.5 | 3.6 | [1] | 5.4 | [1]
Interest expense related to lease liabilities |  | 105.1 |  |  |  |
Finance costs |  | 359.1 | 279.1 |  | 261.9 |
Continuing Operation [member] |  |  |  |  |  |
Statement [Line Items] |  |  |  |  |  |
Income from equity investments |  | 18.3 | 15.2 | [1] | 16.7 | [1]
Interest income |  | 80.7 | 83.7 | [1] | 72.3 | [1]
Finance income |  | 99.0 | 98.9 | [1] | 89.0 | [1]
Net interest expense on pension plans |  | 3.5 | 3.6 | [1] | 5.4 | [1]
Interest on other long-term employee benefits |  | 3.9 | 3.5 | [1] | 3.3 | [1]
Interest expense and similar charges | [2] | 252.0 | 272.0 | [1] | 253.2 | [1]
Interest expense related to lease liabilities |  | 99.7 |  |  |  |
Finance costs |  | 359.1 | 279.1 | [1] | 261.9 | [1]
Movements in fair value of treasury instruments |  | 0.4 | (11.0) | [1] | 0.4 | [1]
Premium on the early repayment of bonds |  | (63.4) |  |  |  |
Revaluation of investments held at fair value through profit or loss |  | 9.1 | 67.8 | [1] |  |
Revaluation of put options over non-controlling interests |  | (13.5) | 34.4 | [1] | 51.4 | [1]
Revaluation of payments due to vendors (earnout agreements) |  | (1.0) | 78.2 | [1] | 192.1 | [1]
Revaluation of financial instruments |  | £ (68.4) | £ 169.4 | [1] | £ 243.9 | [1]
[1] | 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.
[2] | Interest expense and similar charges are payable on bank overdrafts, bonds and bank loans held at amortised cost.

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