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Intangible Assets
 12 Months Ended
Dec. 31, 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 being amortized on a straight-line basis over their estimated useful lives.
The following table sets forth the gross amount and related accumulated amortization of the Company’s intangible assets at December 31:
 
 
2019
 
2018
In millions
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
Customer relationships
 
$
2,562.1

 
$
(1,321.8
)
 
$
1,240.3

 
$
2,086.8

 
$
(1,176.3
)
 
$
910.5

Patents
 
207.6

 
(187.6
)
 
20.0

 
206.6

 
(182.0
)
 
24.6

Other
 
124.5

 
(73.1
)
 
51.4

 
84.5

 
(54.4
)
 
30.1

Total finite-lived intangible assets
 
$
2,894.2

 
$
(1,582.5
)
 
$
1,311.7

 
$
2,377.9

 
$
(1,412.7
)
 
$
965.2

Trademarks (indefinite-lived)
 
2,837.1

 
—

 
2,837.1

 
2,669.5

 
—

 
2,669.5

Total
 
$
5,731.3

 
$
(1,582.5
)
 
$
4,148.8

 
$
5,047.4

 
$
(1,412.7
)
 
$
3,634.7


Intangible asset amortization expense for 2019, 2018 and 2017 was $171.3 million, $139.3 million and $132.0 million, respectively. Future estimated amortization expense on existing intangible assets in each of the next five years amounts to approximately $177 million for 2020, $174 million for 2021, $174 million for 2022, $173 million for 2023, and $169 million for 2024. As a result of acquisitions that occurred throughout 2019, the Company recorded $687.7 million of intangible assets based on their estimated fair value. Refer to Note 19, "Acquisitions and Divestitures" for more information regarding acquisitions.