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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):
 
December 31, 2015
 
December 31, 2014
 
Gross
Carrying
Amount
 
Accumulated
Amortization*
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization*
 
Net
Carrying
Amount
Amortized intangible assets
 
 
 
 
 
 
 
 
 
 
 
Engineered Papers
Customer-related intangibles
$
10.0

 
$
10.0

 
$

 
$
10.0

 
$
10.0

 
$

Advanced Materials & Structures
Customer Relationships
167.7

 
6.4

 
161.3

 
52.4

 
2.1

 
50.3

Developed Technology
16.0

 
2.4

 
13.6

 
16.0

 
1.2

 
14.8

Customer Contracts
0.9

 
0.5

 
0.4

 
0.9

 

 
0.9

Non-Compete Agreements
1.7

 
0.1

 
1.6

 

 

 

Patents
1.5

 
0.1

 
1.4

 
1.5

 

 
1.5

Total
$
197.8

 
$
19.5

 
$
178.3

 
$
80.8

 
$
13.3

 
$
67.5

 
 
 
 
 
 
 
 
 
 
 
 
Unamortized intangible assets (Advanced Materials & Structures)
 
 
 
 
Trade names
$
35.6

 
 
 
 
 
$
21.8

 
 
 
 
 *  Accumulated amortization also includes adjustments for foreign currency translation.
Schedule of Future Amortization Expense
The following table shows the estimated aggregate amortization expense for the next five years ($ in millions):
For the year ended December 31,
Estimated Amortization Expense
2016
$
12.3

2017
11.9

2018
11.9

2019
11.8

2020
11.5