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Restructuring - Restructuring Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ (13.4)	$ (8.4)	$ (0.4)
Gas Cylinders segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(10.0)	(2.9)	0.0
Elektron segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(3.4)	(5.5)	(0.4)
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(6.7)	(4.6)	(0.4)
Asset impairment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	(6.8)	(2.3)	0.0
Other
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.1	$ (1.5)	$ 0.0

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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=115205541&loc=SL114868664-224227

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