Other assets - Schedule of Other 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]
Non-current security deposits	$ 5.0	$ 2.4	$ 3.6	$ 0.0
Non-current insurance	2.8	1.8	0.0	0.0
Intangible assets, net	1.8	0.4	0.3	0.0
Other assets	$ 9.6	$ 4.6	$ 3.9	$ 0.0