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Accounting Policies (Detail) - GBP (£) £ in Millions | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | [1] | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity | £ 4,270.4 | £ 4,069.0 | £ 4,686.3 | £ 5,050.1 | [1]
Retained earnings |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity | 3,909.2 | 4,367.3 | 4,840.6 | 4,959.2 | [1]
Other reserves |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity | 274.0 | £ (335.9) | £ (48.2) | 191.2 | [1]
Increase (decrease) due to corrections of prior period errors [member] |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity |  |  |  | £ 116.3 |
Increase (decrease) due to corrections of prior period errors [member] | Retained earnings |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity | (111.5) |  |  |  |
Increase (decrease) due to corrections of prior period errors [member] | Other reserves |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity | £ (4.8) |  |  |  |
[1] | Figures have been restated as described in Note 2: Accounting Policies.

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