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Accounting Policies (Detail) - GBP (£) £ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity |  | £ 4,065.1 | £ 4,160.4 | £ 4,270.4 | £ 4,069.0
Retained earnings |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity |  | 3,854.5 | 3,759.7 | 3,909.2 | 4,367.3
Other reserves |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |
Equity | [1] | £ 104.9 | £ 285.2 | £ 274.0 | £ (335.9)
[1] | Accumulated losses on existing equity investments held at fair value through other comprehensive income are £347.2 million at 30 June 2023 (31 December 2022: £343.4 million).

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