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Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Asset impairments			$ 0.0	$ 4.8
Total restructuring charges	$ 0.8	$ 12.7	3.6	21.7
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.8	7.7	3.6	16.7
Asset impairments	0.0	5.0	0.0	5.0
Total restructuring charges	0.8	12.7	3.6	21.7
Gas Cylinders segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0.6
Gas Cylinders segment | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.8	7.7	3.4	16.6
Asset impairments	0.0	0.6	0.0	0.6
Elektron segment | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	0.1	0.0	0.1	0.1
Asset impairments	0.0	4.4	0.0	4.4
Other | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance and related costs	$ (0.1)	$ 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 restructuring charges, remediation cost, and asset impairment loss.

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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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