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Intangible Assets
 9 Months Ended
Sep. 30, 2015
Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
The gross amount of the Company’s intangible assets and related accumulated amortization were as follows:
 
 
September 30, 2015
 
December 31, 2014
In millions
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
Completed technologies/patents
 
$
29.1

 
$
(22.5
)
 
$
6.6

 
$
27.1

 
$
(22.8
)
 
$
4.3

Customer relationships
 
198.0

 
(38.0
)
 
160.0

 
94.7

 
(37.0
)
 
57.7

Trademarks (finite-lived)
 
82.0

 
(35.5
)
 
46.5

 
89.3

 
(36.0
)
 
53.3

Other
 
17.0

 
(9.0
)
 
8.0

 
10.2

 
(10.2
)
 
—

Total finite-lived intangible assets
 
326.1

 
$
(105.0
)
 
221.1

 
221.3

 
$
(106.0
)
 
115.3

Trademarks (indefinite-lived)
 
39.2

 
 
 
39.2

 
10.1

 
 
 
10.1

Total
 
$
365.3

 
 
 
$
260.3

 
$
231.4

 
 
 
$
125.4



Intangible asset amortization expense was $6.6 million and $7.2 million for the nine months ended September 30, 2015 and 2014, respectively. Future estimated amortization expense on existing intangible assets in each of the next five years amounts to approximately $10.9 million for full year 2015, $17.2 million for 2016, $17.2 million for 2017, $17.2 million for 2018, and $17.2 million for 2019.