Intangible Assets Intangible Assets

3 Months Ended

Mar. 31, 2014

Intangible Assets Disclosure [Abstract]

Intangible Assets Disclosure [Text Block]

Intangible Assets

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



	March 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 Relationships (Filtration)	45.3		0.6		44.7		45.3		0.1		45.2
Developed Technology (Filtration)	13.8		0.3		13.5		13.8		0.1		13.7
Total	$	59.1	$	0.9	$	58.2	$	59.1	$	0.2	$	58.9

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

Amortization expense of intangible assets was $0.8 million and $0.1 million for the three months ended March 31, 2014 and 2013, respectively. Finite-lived intangibles in the Filtration segment are expensed using the straight-line amortization method. The estimated aggregate amortization expense is $3.1 million in each of the next five years.