Staff costs and Directors' remuneration - Summary of Director's Emoluments (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Director [member]
Disclosure of Directors Emoluments [Line Items]
Base salaries, fees, performance payments and benefits	$ 7.9	$ 8.4	$ 4.2

The amount of remuneration paid or payable to the entity's directors.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 112
-Subparagraph c
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-URIDate 2022-03-24

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Balance Type:	debit
Period Type:	duration