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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Impairments
 
Foreign Exchange
 
Net
Carrying
Amount
Amortized Intangible Assets
 
 
 
 
 
 
 
 
 
Engineered Papers
Customer-related intangibles
$
10.0

 
$
10.0

 
$
—

 
$
—

 
$
—

Advanced Materials & Structures
Customer relationships
168.3

 
15.9

 
—

 
3.1

 
149.3

Developed technology
15.9

 
3.6

 
—

 
0.4

 
11.9

Customer contracts
0.9

 
0.9

 
—

 
—

 
—

Trade names
21.8

 
—

 
20.7

 
0.3

 
0.8

Non-compete agreements
1.7

 
0.5

 
—

 
—

 
1.2

Patents
1.5

 
0.2

 
—

 
—

 
1.3

Total
$
220.1

 
$
31.1

 
$
20.7

 
$
3.8

 
$
164.5

 
 
 
 
 
 
 
 
 
 
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names
$
12.9

 
$
—

 
$
—

 
$
(0.1
)
 
$
13.0
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
2017
$
12.6

2018
11.8

2019
11.7

2020
11.3

2021
11.3