Asset retirement obligations - Reconciliation of Asset Retirement Obligations (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
Dec. 31, 2022	Dec. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance, beginning of the year	$ 0.4	$ 0.4	$ 0.4	$ 0.0
Non-cash additions	0.0	0.5	0.0	0.4
Accretion of liability and foreign exchange	0.0	0.1	0.0	0.0
Balance, end of year	$ 0.4	$ 1.0	$ 0.4	$ 0.4

Asset Retirement Obligation, Accretion And Foreign Exchange Expense

No definition available.

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- Definition

Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481850/410-20-50-1

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481850/410-20-50-1

+ Details

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