Revenue - product sales and recycling services (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 5.9	$ 18.3	$ 13.4	$ 7.3
Product revenue
Disaggregation of Revenue [Line Items]
Product revenue recognized in the period	3.5	17.9	14.3	6.1
Fair value pricing adjustments	2.3	(5.3)	(2.2)	0.8
Revenue	5.8	12.6	12.1	6.9
Recycling service revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 0.1	$ 5.7	$ 1.3	$ 0.4