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Intangible Assets
 12 Months Ended
Dec. 31, 2013
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):

 
December 31, 2013
 
December 31, 2012
 
Gross
Carrying
Amount
 
Accumulated
Amortization*
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization*
 
Net
Carrying
Amount
Amortized intangible assets
 
 
 
 
 
 
 
 
 
 
 
Customer-related intangibles
(Reconstituted Tobacco)
$
10.0

 
$
10.0

 
$
—

 
$
10.0

 
$
9.6

 
$
0.4

Customer Relationships (Filtration)
45.3

 
0.1

 
45.2

 
—

 
—

 
—

Developed Technology
(Filtration)
13.8

 
0.1

 
13.7

 
—

 
—

 
—

Total
$
69.1

 
$
10.2

 
$
58.9

 
$
10.0

 
$
9.6

 
$
0.4

 
 
 
 
 
 
 
 
 
 
 
 
Unamortized intangible assets (Filtration)
 
 
 
 
 
 
 
 
 
 
Trade names
$
21.8

 
 
 
 
 
$
—

 
 
 
 
 *  Accumulated amortization also includes adjustments for foreign currency translation.

Amortization expense of intangible assets was $0.6 million, $1.1 million and $1.6 million and for the years ended December 31, 2013, 2012 and 2011, respectively. Finite-lived intangibles in the Filtration segment are expensed using the straight-line amortization method. The following table shows the estimated aggregate amortization expense for the next five years ($ in millions):
 
Estimated Amortization Expense
For the year ended December 31, 2014
$
3.1

For the year ended December 31, 2015
3.1

For the year ended December 31, 2016
3.1

For the year ended December 31, 2017
3.1

For the year ended December 31, 2018
3.1