Auditors' remuneration - Additional information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Auditors Remuneration [Line Items]
Total remuneration	$ 30.8	$ 29.3	$ 25.1
Audit fees	27.7	27.0	22.6
Audit-related fees	3.0	2.0	2.3
Tax fees	0.0	0.0	0.0
Other fees	0.1	0.3	0.2
KPMG
Auditors Remuneration [Line Items]
Total remuneration	$ 30.8	$ 29.3	$ 25.1

The amount of fees paid or payable to the entity's auditors for auditing services.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration