Fair value gain (loss) on financial instruments (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
Dec. 31, 2022	Dec. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Fair Value Disclosures [Abstract]
Fair value gain (loss) on embedded derivatives	$ 21.4	$ 22.1	$ 31.3	$ (1.4)
Fair value gain (loss) on warrants	0.0	0.0	36.2	(33.8)
Fair value gain (loss) on financial instruments	$ 21.4	$ 22.1	$ 67.5	$ (35.2)

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A

Name:	us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration