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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 27, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets
Gross	$ 21.1	$ 21.5
Accumulated amortization	(8.4)	(7.9)
Net	12.7	13.6
Customer relationships
Finite-Lived Intangible Assets
Gross	13.4	13.4
Accumulated amortization	(5.0)	(4.6)
Net	8.4	8.8
Technology and trading related
Finite-Lived Intangible Assets
Gross	7.7	8.1
Accumulated amortization	(3.4)	(3.3)
Net	$ 4.3	$ 4.8

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
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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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
-Section 50
-Paragraph 5
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