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Goodwill and other intangible assets, net (Tables) | 6 Months Ended
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Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill by operating segment are as follows:
| Operating Segments |  |
In millions | Performance Chemicals |  | Performance Materials |  | Total
December 31, 2016 | $ | 8.1 |  |  | $ | 4.3 |  |  | $ | 12.4 |
Foreign currency translation | — |  |  | — |  |  | — |
June 30, 2017 | $ | 8.1 |  |  | $ | 4.3 |  |  | $ | 12.4 |
Schedule of Finite-Lived Intangible Assets | All of our other intangible assets, net are related to the Performance Chemicals operating segment. The following table summarizes intangible assets:
| June 30, 2017 |  | December 31, 2016
In millions | Gross carrying amount |  | Accumulated amortization |  | Net |  | Gross carrying amount |  | Accumulated amortization |  | Net
Brands (1) | $ | 13.9 |  |  | $ | 11.6 |  |  | $ | 2.3 |  |  | $ | 13.9 |  |  | $ | 11.3 |  |  | $ | 2.6 |
Customer contracts and relationships | 28.2 |  |  | 24.4 |  |  | 3.8 |  |  | 28.2 |  |  | 23.5 |  |  | 4.7 |
Other intangibles, net | $ | 42.1 |  |  | $ | 36.0 |  |  | $ | 6.1 |  |  | $ | 42.1 |  |  | $ | 34.8 |  |  | $ | 7.3 |
_______________ (1) Represents trademarks, trade names and know-how.
Finite-lived Intangible Assets Amortization Expense | The amortization expense related to our intangible assets in the table above is shown in the table below. Amortization expense is included within Cost of sales and Selling, general and administrative expenses on the Condensed Consolidated Statements of Operations.
| Three Months Ended June 30, |  | Six months ended June 30,
In millions | 2017 |  | 2016 |  | 2017 |  | 2016
Amortization expense | $ | 0.7 |  |  | $ | 0.8 |  |  | $ | 1.3 |  |  | $ | 1.6 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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