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Intangible Assets
 3 Months Ended
Mar. 31, 2012
Intangible Assets Abstract  
Intangible Assets
Intangible Assets
The following table sets forth the gross amount of the Company’s intangible assets and related accumulated amortization:
 
 
March 31, 2012
 
December 31, 2011
In millions
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
Completed technologies/patents
 
$
208.5

 
$
(118.9
)
 
$
89.6

 
$
207.1

 
$
(112.6
)
 
$
94.5

Customer relationships
 
1,965.8

 
(439.3
)
 
1,526.5

 
1,962.0

 
(412.7
)
 
1,549.3

Trademarks (finite-lived)
 
98.6

 
(29.3
)
 
69.3

 
96.1

 
(27.6
)
 
68.5

Other
 
70.4

 
(57.5
)
 
12.9

 
70.0

 
(56.2
)
 
13.8

Total finite-lived intangible assets
 
2,343.3

 
$
(645.0
)
 
1,698.3

 
2,335.2

 
$
(609.1
)
 
1,726.1

Trademarks (indefinite-lived)
 
2,611.0

 
 
 
2,611.0

 
2,611.0

 
 
 
2,611.0

Total
 
$
4,954.3

 
 
 
$
4,309.3

 
$
4,946.2

 
 
 
$
4,337.1


Intangible asset amortization expense was $35.1 million and $38.0 million for the three months ended March 31, 2012 and 2011, 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.