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Tax - Deferred Tax - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax assets | $ 134.0 | $ 126.0 | [1]
Uncertain tax positions current liability | 14.0 | 9.0 |
Deferred tax assets recognized related to legal entities which suffered tax loss | 0.0 | 107.0 |
Deferred tax assets liabilities net threshold | 10.0 |  |
Top of range [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Uncertain tax positions current liability | 3.0 | 3.0 |
United Kingdom [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax assets | $ 113.0 | 109.0 |
Deferred Tax Asset Offset Percentage On Annual Profits (50% restriction on deferred tax losses) | 50.00% |  |
Deferred Tax Assets Relating To Revenue Losses | $ 73.0 | $ 73.0 |
United Kingdom [member] | Bottom of range [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred Tax Asset Reverse Period | 7 years | 7 years |
United Kingdom [member] | Top of range [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred Tax Asset Reverse Period | 10 years | 10 years |
UNITED STATES | Internal Revenue Service [Member] | Tax Uncertainties [Member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Uncertain tax positions current liability | $ 6.0 | $ 3.0 |
Unprovided deferred tax on unremitted earnings [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Unremitted earnings on which no deferred tax provided | $ 0.5 | $ 0.5 |
[1] | Re-presented for the adoption of IFRS 17 ‘Insurance Contracts’ (see New accounting standards and other presentational changes).

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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_f&doctype=Standard -URIDate 2023-03-23 + Details
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