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Intangible Assets
 9 Months Ended
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):
 
September 30, 2015
 
December 31, 2014
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Foreign Currency Impact
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Foreign Currency Impact
 
Net
Carrying
Amount
Amortized intangible assets
 
 
 
 
 
 
 
 
 
 
 
 
Reconstituted Tobacco
Customer-related intangibles
$
10.0

 
$
10.0

 
$
—

 
$
—

 
$
10.0

 
$
10.0

 
$
—

 
$
—

Advanced Materials & Structures
Customer Relationships
51.4

 
3.9

 
(0.3
)
 
47.2

 
51.4

 
2.1

 
—

 
49.3

Developed Technology
16.0

 
2.1

 
(0.2
)
 
13.7

 
16.0

 
1.2

 
—

 
14.8

Customer Contracts
1.9

 
0.4

 
—

 
1.5

 
1.9

 
—

 
—

 
1.9

Patents
1.5

 
0.1

 
—

 
1.4

 
1.5

 
—

 
—

 
1.5

Total
$
80.8


$
16.5


$
(0.5
)
 
$
63.8


$
80.8


$
13.3


$
—

 
$
67.5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unamortized intangible assets (Advanced Materials & Structures)
Trade names
$
21.8

 
 
 
 
 
 
 
$
21.8

 
 
 
 
 
 

Amortization expense of intangible assets was $1.1 million and $0.8 million for the three months ended September 30, 2015 and 2014, respectively, and $3.2 million and $2.3 million for the nine months ended September 30, 2015 and 2014, respectively. Finite-lived intangibles in the Advanced Materials & Structures segment are expensed using the straight-line amortization method. The estimated average aggregate amortization expense is $4.0 million in each of the next five years.