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Segment Information (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Financial information by reportable segment for the years ended December 31 is included in the following summary:

						2025
			In millions			Gas Cylinders						Elektron						Graphic Arts						Total
			Net sales			$	174.8					$	196.4					$	13.4					$	384.6
			Manufacturing fixed costs			(29.4)						(32.5)						(4.0)						(65.9)
			Other cost of sales(1)			(117.2)						(104.9)						(7.4)						(229.5)
			Other segment items(2)			(16.5)						(27.9)						(4.6)						(49.0)
			Segment adjusted EBITA			$	11.7					$	31.1					$	(2.6)					40.2
			Amortization																					(0.8)
			Share-based compensation charges																					(3.6)
			Restructuring charges																					(9.0)
			Other costs																					(0.8)
			Disposal related costs																					(2.0)
			Defined benefit pension credit																					1.3
			Interest expense, net																					(3.1)
			Income before tax from continuing operations																					$	22.2

						2024
			In millions			Gas Cylinders						Elektron						Graphic Arts						Total
			Net sales			$	186.3					$	176.0					$	29.6					$	391.9
			Manufacturing fixed costs			(28.7)						(28.4)						(7.7)						(64.8)
			Other cost of sales(1)			(127.4)						(95.6)						(18.4)						(241.4)
			Other segment items(2)			(15.6)						(18.5)						(6.4)						(40.5)
			Segment adjusted EBITA			$	14.6					$	33.5					$	(2.9)					45.2
			Amortization																					(0.8)
			Share-based compensation charges																					(3.5)
			Restructuring charges																					(4.7)
			Gain on disposal of assets held for sale																					6.1
			Disposal related costs																					(12.2)
			Defined benefit pension charge																					1.6
			Interest expense, net																					(5.2)
			Loss before tax from continuing operations																					$	26.5

						2023
			In millions			Gas Cylinders						Elektron						Graphic Arts						Total
			Net sales			$	186.4					$	187.1					$	31.5					$	405.0
			Manufacturing fixed costs			(29.1)						(29.4)						(10.9)						(69.4)
			Other cost of sales(1)			(129.8)						(107.9)						(21.3)						(259.0)
			Other segment items(2)			(14.9)						(29.0)						(5.8)						(49.7)
			Segment adjusted EBITA			$	12.6					$	20.8					$	(6.5)					26.9
			Amortization																					(0.8)
			Share-based compensation charges																					(2.8)
			Restructuring charges																					(6.4)
			Impairment charges																					(12.7)
			Defined benefit pension credit																					(7.6)
			Interest expense, net																					(6.3)
			Income before tax from continuing operations																					$	(9.7)

During 2025 there were $0.1 million sales made between our Elektron segment and Graphic Arts segment (2024: $0.7 million and 2023: $0.7 million )

(1) Other cost of sales includes material costs and variable costs.

(2) Other segment items primarily consists of sales, marketing, research and development, general and admin costs.

18.    Segment Information (continued)

						Depreciation and amortization																					Restructuring Charges
			In millions			2025						2024						2023									2025						2024						2023
			Gas Cylinders segment			$	3.3					$	3.4					$	4.1								$	6.5					$	4.5					$	5.9
			Elektron segment			6.6						6.7						6.6									2.5						0.2						0.5
			Graphic Arts segment			—						—						2.0									—						—						—
			Consolidated			$	9.9					$	10.1					$	12.7								$	9.0					$	4.7					$	6.4

						Total assets												Capital expenditure
			In millions			2025						2024						2025						2024						2023
			Gas Cylinders segment			$	121.8					$	122.5					$	1.9					$	4.8					$	2.1
			Elektron segment			171.0						173.1						5.8						5.4						6.1
			Graphic Arts segment			—						14.8						0.1						0.3						1.0
			Total reportable segments			292.8						310.4						7.8						10.5						9.2
			Other			71.4						64.3						—						—						—
			Discontinued operations			5.5						7.7						0.2						—						0.1
						$	369.7					$	382.4					$	8.0					$	10.5					$	9.3

The following tables present certain geographic information by geographic region for the years ended December 31:

						Net Sales(1)
						2025									2024									2023
						$M			Percent						$M			Percent						$M			Percent
			United States			$	244.0		63.5		%				$	228.1		58.2		%				$	243.1		60.0		%
			Germany			24.0			6.2		%				22.6			5.8		%				19.2			4.7		%
			U.K.			23.8			6.2		%				26.1			6.7		%				19.7			4.9		%
			Japan			18.2			4.7		%				22.0			5.6		%				19.3			4.8		%
			Canada			11.2			2.9		%				11.3			2.8		%				11.2			2.8		%
			Top five countries			$	321.2		83.5		%				$	310.1		79.1		%				$	312.5		77.2		%
			Rest of Europe			35.6			9.3		%				47.0			12.0		%				47.5			11.7		%
			Asia Pacific			22.1			5.7		%				23.2			5.9		%				28.0			6.9		%
			Rest of the World(2)			5.7			1.5		%				11.6			3.0		%				17.0			4.2		%
						$	384.6								$	391.9								$	405.0

(1) Net sales are based on the geographic destination of sale.

(2) Rest of the World

Revenue from External Customers and Long-term Assets by Geographic Areas

									Property, plant and equipment, net
			In millions						2025						2024
			United States						$	23.3					$	26.7
			United Kingdom						34.1						33.0
			Canada						2.5						2.8
			Asia Pacific						0.3						0.3
									$	60.2					$	62.8

X

- Definition

Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries.

+ References

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-Topic 220
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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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