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Goodwill and other intangible assets, net
6 Months Ended
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.