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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Gross	$ 21.3	$ 21.3
Accumulated amortization	(7.0)	(6.7)
Net	14.3	14.6
Customer relationships
Finite-Lived Intangible Assets
Gross	13.4	13.4
Accumulated amortization	(4.1)	(3.8)
Net	9.3	9.6
Technology and trading related
Finite-Lived Intangible Assets
Gross	7.9	7.9
Accumulated amortization	(2.9)	(2.9)
Net	$ 5.0	$ 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
-Subparagraph (a)(1)
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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
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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+ References

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-Topic 350
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