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Segmental Information - Financial information by reportable segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net Sales	$ 99.5	$ 107.1	$ 116.5	$ 120.4	$ 110.9	$ 129.1	$ 128.2	$ 119.7	$ 443.5	$ 487.9	$ 441.3
Adjusted EBITDA									68.1	79.6	59.3
Depreciation and amortization									15.3	19.0	18.3
Restructuring charges	1.6								25.9	13.4	8.4
Total assets	390.3				408.8				390.3	408.8	415.8
Capital expenditure									14.8	13.6	10.0
Intersegment Revenues Between Elektron Segment and Gas Cylinders Segment
Segment Reporting Information [Line Items]
Net Sales									0.4	0.4	0.4
Gas Cylinders segment
Segment Reporting Information [Line Items]
Net Sales									223.6	238.1	220.2
Elektron segment
Segment Reporting Information [Line Items]
Net Sales									219.9	249.8	221.1
Operating Segments | Gas Cylinders segment
Segment Reporting Information [Line Items]
Net Sales									223.6	238.1	220.2
Adjusted EBITDA									23.3	23.4	17.0
Depreciation and amortization									5.7	7.3	7.2
Restructuring charges									20.7	10.0	2.9
Total assets	156.0				157.0				156.0	157.0	156.9
Capital expenditure									3.9	2.8	3.5
Operating Segments | Elektron segment
Segment Reporting Information [Line Items]
Net Sales									219.9	249.8	221.1
Adjusted EBITDA									44.8	56.2	42.3
Depreciation and amortization									9.6	11.7	11.1
Restructuring charges									5.2	3.4	5.5
Total assets	200.8				217.5				200.8	217.5	210.4
Capital expenditure									10.9	10.5	5.8
Other
Segment Reporting Information [Line Items]
Total assets	$ 33.5				$ 34.3				33.5	34.3	48.5
Capital expenditure									$ 0.0	$ 0.3	$ 0.7

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