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Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Restructuring Cost and Reserve [Line Items]
Asset impairments			$ 0.0	$ 4.8
Total restructuring charges	$ 4.3	$ 2.6	7.9	24.3
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	4.3	2.6	7.9	19.3
Asset impairments	0.0	0.0	0.0	5.0
Total restructuring charges	4.3	2.6	7.9	24.3
Gas Cylinders segment | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	3.4	2.3	6.8	18.9
Asset impairments	0.0	0.0	0.0	0.6
Elektron segment | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.9	0.3	1.0	0.4
Asset impairments	0.0	0.0	0.0	4.4
Other | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	$ 0.0	$ 0.0	$ 0.1	$ 0.0

X

- Definition

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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