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Goodwill and other identifiable intangible assets (Tables)

3 Months Ended

Mar. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in goodwill during the first three months ended March 30, 2025, were as follows:

			In millions			Gas Cylinders						Elektron						Total
			At January 1, 2025			$	25.9					$	41.1					$	67.0
			Exchange difference			0.7						0.4						1.1
			Net balance at March 30, 2025			$	26.6					$	41.5					$	68.1

Schedule of Intangible Assets

Identifiable intangible assets consisted of the following:

			In millions			Customer relationships						Technology and trading related						Total
			Cost:
			At January 1, 2025			$	15.6					$	7.7					$	23.3
			Exchange movements			—						0.2						0.2
			At March 30, 2025			$	15.6					$	7.9					$	23.5
			Accumulated amortization:
			At January 1, 2025			$	7.0					$	4.8					$	11.8
			Provided during the period			0.1						0.1						0.2
			Exchange movements			—						0.1						0.1
			At March 30, 2025			$	7.1					$	5.0					$	12.1
			Net book values:
			At January 1, 2025			$	8.6					$	2.9					$	11.5
			At March 30, 2025			$	8.5					$	2.9					$	11.4

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Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

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Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

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