Related party transactions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disclosure of transactions between related parties [abstract]
Key management personnel compensation, directors fees	$ 0.1	$ 0.1	$ 0.2	$ 0.2
Services received, related party transactions	$ 0.1	$ 0.1	$ 0.1	$ 0.2

The amount of services received in related party transactions. [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2023-01-01
-Paragraph 21
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2023-en-r&anchor=para_21_c&doctype=Standard
-URIDate 2023-03-23

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