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Restructuring - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 2.6	$ 1.1	$ 24.3	$ 2.1
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	2.6	0.4	19.3	2.1
Severance and related costs | Gas Cylinders
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	2.3	0.0	18.9	0.1
Severance and related costs | Elektron
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0.3	0.4	0.4	2.0
Asset impairments
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0.0	0.7	5.0	0.0
Asset impairments | Gas Cylinders
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0.0	0.0	0.6	0.0
Asset impairments | Elektron
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0.0	$ 0.7	$ 4.4	$ 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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