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Goodwill and other identifiable intangible assets (Tables)

3 Months Ended

Mar. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in goodwill during the first three months ended March 31, 2024, were as follows:

			In millions			Gas Cylinders						Elektron						Total
			At January 1, 2024			$	26.2					$	41.3					$	67.5
			Exchange difference			(0.2)						(0.1)						(0.3)
			Net balance at March 31, 2024			$	26.0					$	41.2					$	67.2

Schedule of Intangible Assets

Identifiable intangible assets consisted of the following:

			In millions			Customer relationships						Technology and trading related						Total
			Cost:
			At January 1, 2024			$	15.2					$	7.8					$	23.0
			Exchange movements			—						(0.1)						(0.1)
			At March 31, 2024			$	15.2					$	7.7					$	22.9
			Accumulated amortization:
			At January 1, 2024			$	6.6					$	4.4					$	11.0
			Provided during the period			0.1						0.1						0.2
			Exchange movements			—						(0.1)						(0.1)
			At March 31, 2024			$	6.7					$	4.4					$	11.1
			Net book values:
			At January 1, 2024			$	8.6					$	3.4					$	12.0
			At March 31, 2024			$	8.5					$	3.3					$	11.8

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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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