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Goodwill and Purchased Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Purchased Intangible Assets Goodwill and Purchased Intangible Assets

Goodwill

The Company's goodwill activity was as follows (in millions):
 
Total
December 31, 2017
$
3,096.2

Additions due to business combination
14.4

Other(*)
(1.8
)
December 31, 2018
3,108.8

Additions due to business combination
228.3

December 31, 2019
$
3,337.1


________________________________
(*)
Other primarily consists of certain purchase accounting adjustments related to the acquisition of Cyphort.

In the fourth quarter of 2019, the Company performed its annual goodwill impairment test for the three reporting units: Routing, Switching, and Security. There was no goodwill impairment during the years ended December 31, 2019, 2018, and 2017.

Purchased Intangible Assets

The Company’s purchased intangible assets, net, were as follows (in millions):
 
As of December 31, 2019
 
As of December 31, 2018
 
Gross
 
Accumulated
Amortization
 
Accumulated Impairments and
Other Charges
 
Net
 
Gross
 
Accumulated
Amortization
 
Accumulated Impairments and
Other Charges
 
Net
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  Technologies and patents
$
729.1

 
$
(564.0
)
 
$
(49.9
)
 
$
115.2

 
$
648.1

 
$
(534.0
)
 
$
(49.9
)
 
$
64.2

  Customer contracts, support agreements, and related relationships
98.6

 
(79.3
)
 
(2.8
)
 
16.5

 
83.6

 
(75.5
)
 
(2.8
)
 
5.3

  Trade names and other
7.9

 
(2.8
)
 
—

 
5.1

 
2.0

 
(2.0
)
 
—

 
—

    Total
835.6

 
(646.1
)
 
(52.7
)
 
136.8

 
733.7

 
(611.5
)
 
(52.7
)
 
69.5

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  IPR&D
49.0

 
—

 
—

 
49.0

 
49.0

 
—

 
—

 
49.0

Total purchased intangible assets
$
884.6

 
$
(646.1
)
 
$
(52.7
)
 
$
185.8

 
$
782.7

 
$
(611.5
)
 
$
(52.7
)
 
$
118.5



Amortization expense related to purchased intangible assets with finite lives was $34.7 million, $17.4 million, and $17.5 million for the years ended December 31, 2019, 2018, and 2017, respectively. There were no impairment charges related to purchased intangible assets during the years ended December 31, 2019, 2018, and 2017.

As of December 31, 2019, the estimated future amortization expense of purchased intangible assets with finite lives is as follows (in millions):
Years Ending December 31,
Amount
2020
$
39.5

2021
35.3

2022
30.0

2023
25.7

2024
6.3

Thereafter
—

Total
$
136.8