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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross	$ 21.7	$ 21.7
Accumulated amortization	(9.5)	(8.9)
Net	12.2	12.8
Customer relationships
Finite-Lived Intangible Assets
Gross	13.4	13.4
Accumulated amortization	(5.5)	(5.2)
Net	7.9	8.2
Technology and trading related
Finite-Lived Intangible Assets
Gross	8.3	8.3
Accumulated amortization	(4.0)	(3.7)
Net	$ 4.3	$ 4.6

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
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