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Intangible Assets
 12 Months Ended
Dec. 31, 2011
Intangible Assets Abstract  
Intangible Assets
INTANGIBLE ASSETS
The following table sets forth the gross amount and related accumulated amortization of the Company’s intangible assets at December 31:
 
 
 
2011
 
2010
In millions
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
Completed technologies/patents
 
$
207.1

 
$
(112.6
)
 
$
94.5

 
$
199.4

 
$
(81.7
)
 
$
117.7

Customer relationships
 
1,962.0

 
(412.7
)
 
1,549.3

 
1,960.4

 
(300.2
)
 
1,660.2

Trademarks (finite-lived)
 
96.1

 
(27.6
)
 
68.5

 
98.6

 
(24.3
)
 
74.3

Other
 
70.0

 
(56.2
)
 
13.8

 
177.0

 
(161.1
)
 
15.9

Total finite-lived intangible assets
 
2,335.2

 
$
(609.1
)
 
1,726.1

 
2,435.4

 
$
(567.3
)
 
1,868.1

Trademarks (indefinite-lived)
 
2,611.0

 
 
 
2,611.0

 
2,611.0

 
 
 
2,611.0

Total
 
$
4,946.2

 
 
 
$
4,337.1

 
$
5,046.4

 
 
 
$
4,479.1



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 2011, 2010 and 2009 was $144.6 million, $153.2 million and $156.1 million, respectively. Future estimated amortization expense on existing intangible assets in each of the next five years amounts to approximately $145 million for 2012, $142 million for 2013, $138 million for 2014, $112 million for 2015, and $66 million for 2016.
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 2011, 2010 and 2009. 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 2011, 2010 and 2009.