Intangible Assets

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):



	December 31, 2014						December 31, 2013
	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	$	10.0	$	—
Customer Relationships (Filtration)	51.4		2.1		49.3		45.3		0.1		45.2
Developed Technology (Filtration)	16.0		1.2		14.8		13.8		0.1		13.7
Customer Contracts (Filtration)	1.9		—		1.9		—		—		—
Patents (Filtration)	1.5		—		1.5		—		—		—
Total	$	80.8	$	13.3	$	67.5	$	69.1	$	10.2	$	58.9

Unamortized intangible assets (Filtration)
Trade names	$	21.8					$	21.8

* Accumulated amortization also includes adjustments for foreign currency translation.

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



For the year ended December 31,	Estimated Amortization Expense
2015	$	4.2
2016	4.2
2017	3.8
2018	3.8
2019	3.8