Prepayments, deposits and other current assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Oct. 31, 2022	Oct. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid equipment deposits	$ 40.1	$ 86.1	$ 76.4	$ 3.2
Prepaid transaction costs	7.8	0.6	0.3	0.0
Prepaid lease deposits	5.6	2.9	2.8	0.9
Prepaid insurance	4.6	6.0	5.7	3.8
Prepaid construction charges	2.6	1.4	1.4	0.0
Other prepaids	3.3	2.4	2.8	0.7
Total prepayments, deposits and other current assets	64.0	99.4	89.4	8.6
Non-current security deposits	(5.0)	(2.4)	(3.6)	0.0
Non-current insurance	(2.8)	(1.8)	0.0	0.0
Prepayments, deposits and other current assets	$ 56.2	$ 95.2	$ 85.8	$ 8.6