Related party transactions - Narrative (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended
Dec. 31, 2022	Oct. 31, 2021
Disclosure of transactions between related parties [line items]
Key management personnel compensation, directors fees	$ 0.1	$ 0.1

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration