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Goodwill and other intangible assets, net - Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets, Net |  |
Net | $ 6.1 | $ 7.3
Performance Chemicals |  |
Finite-Lived Intangible Assets, Net |  |
Gross carrying amount | 42.1 | 42.1
Accumulated amortization | 36.0 | 34.8
Net | 6.1 | 7.3
Performance Chemicals | Brands |  |
Finite-Lived Intangible Assets, Net |  |
Gross carrying amount | 13.9 | 13.9
Accumulated amortization | 11.6 | 11.3
Net | 2.3 | 2.6
Performance Chemicals | Customer contracts and relationships |  |
Finite-Lived Intangible Assets, Net |  |
Gross carrying amount | 28.2 | 28.2
Accumulated amortization | 24.4 | 23.5
Net | $ 3.8 | $ 4.7

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- 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/presentationRef -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 + Details
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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/presentationRef -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 + Details
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