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Goodwill and other intangible assets, net | 6 Months Ended
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Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other intangible assets | Goodwill and other intangible assets, net 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 |
There were no events or circumstances indicating that goodwill might be impaired as of June 30, 2017. 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. 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 |
Based on the current carrying values of intangible assets, estimated pre-tax amortization expense for the next five years is as follows: 2017 - $2.5 million, 2018 - $1.8 million, 2019 - $1.6 million, 2020 - $0.5 million and 2021 - $0.3 million. The estimated pre-tax amortization expense may fluctuate due to changes in foreign currency.

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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