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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Statement [Line Items] |  |  |
Income from equity investments | £ 5.0 | £ 6.8 | [1]
Finance income | 30.1 | 51.2 | [1]
Finance costs | 147.2 | 157.3 | [1]
Revaluation and Retranslation of Financial Instruments | (12.1) | (268.6) | [1]
Continuing Operations [member] |  |  |
Statement [Line Items] |  |  |
Income from equity investments | 5.0 | 6.8 |
Interest income | 25.1 | 44.4 |
Finance income | 30.1 | 51.2 |
Interest expense and similar charges | 101.5 | 107.1 |
Interest expense related to lease liabilities | 45.7 | 50.2 |
Finance costs | 147.2 | 157.3 |
Movements in fair value of treasury instruments | 4.7 | (2.0) | [1]
Premium on the early repayment of bonds |  |  |
Revaluation of investments held at fair value through profit or loss | 30.5 | 1.7 | [1]
Revaluation of put options over non-controlling interests | (44.4) | 25.4 | [1]
Revaluation of payments due to vendors (earnout agreements) | (9.4) | 7.4 | [1]
Retranslation of financial instruments | 19.6 | (301.1) | [1]
Revaluation and Retranslation of Financial Instruments | £ (12.1) | £ (268.6) | [1]
[1] | Figures have been restated as described in the accounting policies.

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