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Restructuring charges (Tables)

12 Months Ended

Dec. 31, 2023

Restructuring and Related Activities [Abstract]

Restructuring and Related Costs

Restructuring costs by reportable segment were as follows:

									Years ended December 31,
			In millions						2023						2022						2021
			Severance and other costs
			Gas Cylinders Segment						$	(2.9)					$	(1.7)					$	(5.3)
			Elektron Segment						(0.3)						(0.2)						(0.9)
									$	(3.2)					$	(1.9)					$	(6.2)
			Asset impairments
			Gas Cylinders Segment						$	(3.0)					$	—					$	—
			Elektron Segment						(0.2)						—						—
									$	(3.2)					$	—					$	—
			Total restructuring charges						(6.4)						(1.9)						(6.2)

Schedule of Restructuring Reserve

Activity related to restructuring, recorded in other current liabilities in the consolidated balance sheets is summarized as follows:

			In millions			2023						2022
			Balance at January 1,			$	3.7					$	11.7
			Costs incurred			3.2						1.9
			Cash payments and other			(3.6)						(9.9)
			Balance at December 31,			$	3.3					$	3.7

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- Definition

Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets.

+ References

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- Definition

Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period.

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