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Restructuring - Restructuring Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ (8.9)	$ (25.9)	$ (13.2)
Gas Cylinders segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(7.9)	(20.7)	(9.8)
Elektron segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(0.9)	(5.2)	(3.4)
Other
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(0.1)	0.0	0.0
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(8.9)	(20.9)	(6.5)
Asset impairment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0.0	(5.0)	(6.8)
Other
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.0	$ 0.0	$ 0.1

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- Definition

Amount of restructuring charges, remediation cost, and asset impairment loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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