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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) $ in Millions	6 Months Ended
	Jul. 02, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 65.6
Exchange difference	1.9
Ending balance	67.5
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	25.0
Exchange difference	1.2
Ending balance	26.2
Elektron
Goodwill [Roll Forward]
Beginning balance	40.6
Exchange difference	0.7
Ending balance	$ 41.3

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Details

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X

- Details

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Period Type: