Restructuring - Schedule of restructuring related costs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Restructuring Cost and Reserve [Line Items]
Severance and other costs	$ 0.5	$ 1.2	$ 2.3	$ 1.7
Asset impairments	0.0	0.4	0.0	2.7
Total restructuring charges	0.5	1.6	2.3	4.4
Gas Cylinders
Restructuring Cost and Reserve [Line Items]
Severance and other costs	0.5	1.1	2.1	1.6
Asset impairments	0.0	0.3	0.0	2.6
Elektron
Restructuring Cost and Reserve [Line Items]
Severance and other costs	0.0	0.1	0.2	0.1
Elektron \| Other restructuring
Restructuring Cost and Reserve [Line Items]
Asset impairments	$ 0.0	$ 0.1	$ 0.0	$ 0.1

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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