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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Gross	$ 21.5	$ 21.3
Accumulated amortization	(7.9)	(6.7)
Net	13.6	14.6
Customer relationships
Finite-Lived Intangible Assets
Gross	13.4	13.4
Accumulated amortization	(4.6)	(3.8)
Net	8.8	9.6
Technology and trading related
Finite-Lived Intangible Assets
Gross	8.1	7.9
Accumulated amortization	(3.3)	(2.9)
Net	$ 4.8	$ 5.0

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 340
-Section 50
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+ References

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-Topic 350
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