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Segmental Information - Financial information by reportable segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 110.9	$ 129.1	$ 128.2	$ 119.7	$ 116.1	$ 115.2	$ 106.6	$ 103.4	$ 487.9	$ 441.3	$ 414.8
Adjusted EBITDA									79.6	59.3	51.3
Depreciation and amortization									19.0	18.3	18.0
Restructuring charges	11.3								13.4	8.4	0.4
Total assets	390.4				415.8				390.4	415.8	399.8
Capital expenditure									13.6	10.0	17.3
Gas Cylinders segment
Segment Reporting Information [Line Items]
Net Sales									238.1	220.2	225.8
Adjusted EBITDA									23.4	17.0	18.3
Depreciation and amortization									7.3	7.2	7.4
Restructuring charges									10.0	2.9	0.0
Elektron segment
Segment Reporting Information [Line Items]
Net Sales									249.8	221.1	189.0
Adjusted EBITDA									56.2	42.3	33.0
Depreciation and amortization									11.7	11.1	10.6
Restructuring charges									3.4	5.5	0.4
Operating Segments | Gas Cylinders segment
Segment Reporting Information [Line Items]
Total assets	145.6				156.9				145.6	156.9	151.9
Capital expenditure									2.8	3.5	7.2
Operating Segments | Elektron segment
Segment Reporting Information [Line Items]
Total assets	210.5				210.4				210.5	210.4	190.9
Capital expenditure									10.5	5.8	10.1
Other
Segment Reporting Information [Line Items]
Total assets	$ 34.3				$ 48.5				34.3	48.5	57.0
Capital expenditure									$ 0.3	$ 0.7	$ 0.0

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