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Taxation - Additional Information (Detail) - GBP (£) £ in Millions |  | 6 Months Ended
--- | --- | ---
Mar. 03, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure Of Income Taxes [line items] |  |  |
Effective tax rate on reported (loss)/profit before taxation |  | 27.20% | (0.30%)
Increase In UK Corporation Tax Rate | Bottom of range [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Percentage of increase in corporate tax rate | 19.00% |  |
Increase In UK Corporation Tax Rate | Top of range [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Percentage of increase in corporate tax rate | 25.00% |  |
United Kingdom [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Effective Date from which increase in corporate tax rate is applicable | Apr. 01, 2023 |  |
Deferred tax credit |  | £ 27.0 |

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