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Intangible Assets
 9 Months Ended
Sep. 30, 2019
Intangible Assets Abstract  
Intangible Assets Intangible Assets
Indefinite-lived intangible assets are tested and reviewed annually for impairment during the fourth quarter or whenever there is a significant change in events or circumstances that indicate that the fair value of the asset may be less than the carrying amount of the asset. All other intangible assets with finite useful lives are amortized on a straight-line basis over their estimated useful lives.
The gross amount of the Company’s intangible assets and related accumulated amortization were as follows:
 
 
September 30, 2019
 
December 31, 2018
In millions
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
Customer relationships
 
$
2,542.6

 
$
(1,278.4
)
 
$
1,264.2

 
$
2,086.8

 
$
(1,176.3
)
 
$
910.5

Completed technologies/patents
 
206.0

 
(184.9
)
 
21.1

 
206.6

 
(182.0
)
 
24.6

Other
 
119.4

 
(66.0
)
 
53.4

 
84.5

 
(54.4
)
 
30.1

Total finite-lived intangible assets
 
2,868.0

 
(1,529.3
)
 
1,338.7

 
2,377.9

 
(1,412.7
)
 
965.2

Trademarks (indefinite-lived)
 
2,835.7

 
—

 
2,835.7

 
2,669.5

 
—

 
2,669.5

Total
 
$
5,703.7

 
$
(1,529.3
)
 
$
4,174.4

 
$
5,047.4

 
$
(1,412.7
)
 
$
3,634.7


Intangible asset amortization expense was $47.5 million and $34.7 million for the three months ended September 30, 2019 and 2018, respectively. Intangible asset amortization expense was $123.4 million and $105.1 million for the nine months ended September 30, 2019 and 2018, respectively.