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Restructuring - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 9.0	$ 0.7
Gas Cylinders segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	8.9	0.2
Elektron segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.1	$ 0.5

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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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