Related party transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Related Party Transaction [Line Items]
Total expenses incurred with related parties	$ 0.2	$ 0.4	$ 0.9	$ 0.4
Related party lease and expense - Ashlin BPG
Related Party Transaction [Line Items]
Total expenses incurred with related parties	0.0	0.0	0.1	0.1
Related party expense - Fade In Production Pty.
Related Party Transaction [Line Items]
Total expenses incurred with related parties	0.0	0.1	0.2	0.1
Related party expense - Consulero Inc.
Related Party Transaction [Line Items]
Total expenses incurred with related parties	0.1	0.0	0.1	0.1
Related party expense - Glencore
Related Party Transaction [Line Items]
Total expenses incurred with related parties	0.1	0.3	0.5	0.0
Consulting agreement - Atria Ltd
Related Party Transaction [Line Items]
Total expenses incurred with related parties	0.0	0.0	0.0	0.0
Director Consulting Agreement - Anthony Tse
Related Party Transaction [Line Items]
Total expenses incurred with related parties	$ 0.0	$ 0.0	$ 0.0	$ 0.1