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Restructuring Restructuring - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 1.4
Gas Cylinders segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs	7.5	$ 20.1
Severance costs	0.4
Elektron segment
Restructuring Cost and Reserve [Line Items]
Severance costs	0.9
Asset write down and one time employee benefits		4.6
Other
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 0.1
Gas Cylinders and Elektron Segments
Restructuring Cost and Reserve [Line Items]
Other restructuring costs		$ 1.2

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