Segment Information - Reconciliation of Consolidated Segment Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 391.9	$ 405.0	$ 423.4
Cost of sales	(306.2)	(328.4)	(328.4)
Segment adjusted EBITA		26.9	50.2
Amortization	(10.1)	(12.7)	(13.6)
Share-based compensation charges	(3.5)	(2.8)	(2.5)
Restructuring charges	(4.7)	(6.4)	(1.9)
Gain on disposal of assets held-for-sale	6.1	0.0	0.0
Impairment charges	0.0	(12.7)	0.0
Acquisition and disposal costs	(12.2)	0.0	(0.3)
Defined benefit pension credit	1.6	(7.6)	0.1
Income / (loss) before income taxes	26.5	(9.7)	41.0
Gas Cylinders Segment
Segment Reporting Information [Line Items]
Net sales	186.3	186.4	183.7
Elektron Segment
Segment Reporting Information [Line Items]
Net sales	176.0	187.1	201.0
Graphic Arts
Segment Reporting Information [Line Items]
Net sales	29.6	31.5	38.7
Operating segments
Segment Reporting Information [Line Items]
Net sales	391.9
Manufacturing fixed costs	(64.8)	(69.4)	(68.8)
Cost of sales	(241.4)	(259.0)	(259.6)
Other segment items	(40.5)	(49.7)	(44.8)
Segment adjusted EBITA	45.2
Amortization	(0.8)	(0.8)	(0.7)
Share-based compensation charges	(3.5)	(2.8)	(2.5)
Restructuring charges	(4.7)	(6.4)	(1.9)
Gain on disposal of assets held-for-sale	6.1
Impairment charges		(12.7)
Acquisition and disposal costs	(12.2)		(0.3)
Defined benefit pension credit	1.6	(7.6)	0.1
Interest expense, net	(5.2)	(6.3)	(3.9)
Income / (loss) before income taxes	26.5	(9.7)	41.0
Operating segments \| Gas Cylinders Segment
Segment Reporting Information [Line Items]
Net sales	186.3	186.4	183.7
Manufacturing fixed costs	(28.7)	(29.1)	(30.3)
Cost of sales	(127.4)	(129.8)	(132.3)
Other segment items	(15.6)	(14.9)	(13.1)
Segment adjusted EBITA	14.6	12.6	8.0
Amortization	(3.4)	(4.1)	(4.8)
Operating segments \| Elektron Segment
Segment Reporting Information [Line Items]
Net sales	176.0	187.1	201.0
Manufacturing fixed costs	(28.4)	(29.4)	(27.3)
Cost of sales	(95.6)	(107.9)	(110.6)
Other segment items	(18.5)	(29.0)	(26.5)
Segment adjusted EBITA	33.5	20.8	36.6
Amortization	(6.7)	(6.6)	(6.6)
Operating segments \| Graphic Arts
Segment Reporting Information [Line Items]
Net sales	29.6	31.5	38.7
Manufacturing fixed costs	(7.7)	(10.9)	(11.2)
Cost of sales	(18.4)	(21.3)	(16.7)
Other segment items	(6.4)	(5.8)	(5.2)
Segment adjusted EBITA	(2.9)	(6.5)	5.6
Amortization	0.0	(2.0)	(2.2)
Intersegment eliminations
Segment Reporting Information [Line Items]
Net sales	$ 0.7	$ 0.7	$ 0.4

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