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Accounting policies - Additional Information (Restatement) (Detail) - GBP (£) £ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jan. 01, 2020
Disclosure of Restatements [Line Items] |  |  |  |  |
Retained earnings | £ 4,952.1 |  |  | £ 5,070.7 |
Other reserves | (43.4) |  |  | 196.0 |
Goodwill impairment charge |  | £ 2,812.9 | [1] |  |
Revaluation and retranslation of financial instruments | (12.1) | (268.6) | [1] |  |
Deferred tax liabilities | £ (329.9) |  |  | £ (304.1) |
Financial Statement Impact of Restatements [member] |  |  |  |  |
Disclosure of Restatements [Line Items] |  |  |  |  |
Gain (loss) recognised in revaluation and retranslation on financial instruments |  | (301.1) |  |  |
Retained earnings |  | 87.3 |  |  | £ 271.7
Other reserves |  | 59.6 |  |  |
Goodwill impairment charge |  | 328.2 |  |  |
Revaluation and retranslation of financial instruments |  | 2.5 |  |  |
Impairment of right of use asset and other assets |  | 5.1 |  |  |
Deferred tax credit |  | 13.1 |  |  |
Deferred tax liabilities |  | (13.1) |  |  |
Decrease in goodwill impairment charge |  | £ (36.1) |  |  |
[1] | Figures have been restated as described in the accounting policies.

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