Intangible Assets

12 Months Ended

Dec. 31, 2014

INTANGIBLE ASSETS

The following table sets forth the gross amount and related accumulated amortization of the Company’s intangible assets at December 31:



	2014							2013
In millions	Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
Completed technologies/patents	$	172.2	$	(146.8	)	$	25.4	$	174.1	$	(128.7	)	$	45.4
Customer relationships	1,850.6		(699.8		)	1,150.8		1,865.9		(599.5		)	1,266.4
Other	55.9		(50.2		)	5.7		60.4		(52.2		)	8.2
Total finite-lived intangible assets	2,078.7		$	(896.8	)	1,181.9		2,100.4		$	(780.4	)	1,320.0
Trademarks (indefinite-lived)	2,602.0					2,602.0		2,602.0					2,602.0
Total	$	4,680.7				$	3,783.9	$	4,702.4				$	3,922.0

The Company amortizes intangible assets with finite useful lives on a straight-line basis over their estimated economic lives in accordance with GAAP. Indefinite-lived intangible assets are not subject to amortization, but instead, are tested for impairment at least annually (more frequently if certain indicators are present).

Intangible asset amortization expense for 2014, 2013 and 2012 was $128.3 million, $128.9 million and $129.2 million, respectively. Future estimated amortization expense on existing intangible assets in each of the next five years amounts to approximately $116 million for 2015, $101 million for 2016, $101 million for 2017, $100 million for 2018, and $99 million for 2019.

In accordance with the Company’s indefinite-lived intangible asset impairment testing policy outlined in Note 2, the Company performed its annual impairment test in the fourth quarter of each 2014, 2013 and 2012. In each year, the Company determined the fair value of all indefinite-lived intangible assets to exceed their respective carrying values. Therefore, no impairment charges were recorded during 2014, 2013 and 2012.