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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 27, 2021 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 70.2
Additions	2.4
Exchange difference	0.7
Ending balance	73.3
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	27.9
Additions	2.4
Exchange difference	0.5
Ending balance	30.8
Elektron
Goodwill [Roll Forward]
Beginning balance	42.3
Additions	0.0
Exchange difference	0.2
Ending balance	$ 42.5

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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-Topic 350
-SubTopic 20
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 55
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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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-Publisher FASB
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-SubTopic 20
-Section 50
-Paragraph 1
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- 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

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- 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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