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Goodwill and Purchased Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
The Company's goodwill activity was as follows (in millions):
 
Total
December 31, 2016
$
3,081.7

Additions due to business combination
16.7

Other(*)
(2.2
)
December 31, 2017
3,096.2

Additions due to business combination
14.4

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


________________________________
(*)
Other primarily consists of certain purchase accounting adjustments related to the acquisitions of BTI and Cyphort.
Schedule of Acquired Indefinite-Lived Intangible Assets by Major Class
The Company’s purchased intangible assets, net, were as follows (in millions):
 
As of December 31, 2018
 
As of December 31, 2017
 
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
$
648.1

 
$
(534.0
)
 
$
(49.9
)
 
$
64.2

 
$
640.3

 
$
(518.1
)
 
$
(49.9
)
 
$
72.3

  Customer contracts, support agreements, and related relationships
83.6

 
(75.5
)
 
(2.8
)
 
5.3

 
83.6

 
(74.1
)
 
(2.8
)
 
6.7

  Other
2.0

 
(2.0
)
 
—

 
—

 
2.0

 
(1.9
)
 
—

 
0.1

    Total
733.7

 
(611.5
)
 
(52.7
)
 
69.5

 
725.9

 
(594.1
)
 
(52.7
)
 
79.1

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  IPR&D
49.0

 
—

 
—

 
49.0

 
49.0

 
—

 
—

 
49.0

Total purchased intangible assets
$
782.7

 
$
(611.5
)
 
$
(52.7
)
 
$
118.5

 
$
774.9

 
$
(594.1
)
 
$
(52.7
)
 
$
128.1
Schedule of Acquired Finite-Lived Intangible Assets by Major Class
The Company’s purchased intangible assets, net, were as follows (in millions):
 
As of December 31, 2018
 
As of December 31, 2017
 
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
$
648.1

 
$
(534.0
)
 
$
(49.9
)
 
$
64.2

 
$
640.3

 
$
(518.1
)
 
$
(49.9
)
 
$
72.3

  Customer contracts, support agreements, and related relationships
83.6

 
(75.5
)
 
(2.8
)
 
5.3

 
83.6

 
(74.1
)
 
(2.8
)
 
6.7

  Other
2.0

 
(2.0
)
 
—

 
—

 
2.0

 
(1.9
)
 
—

 
0.1

    Total
733.7

 
(611.5
)
 
(52.7
)
 
69.5

 
725.9

 
(594.1
)
 
(52.7
)
 
79.1

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  IPR&D
49.0

 
—

 
—

 
49.0

 
49.0

 
—

 
—

 
49.0

Total purchased intangible assets
$
782.7

 
$
(611.5
)
 
$
(52.7
)
 
$
118.5

 
$
774.9

 
$
(594.1
)
 
$
(52.7
)
 
$
128.1
Estimated Future Amortization Expense of Purchased Intangible Assets with Finite Lives
As of December 31, 2018, the estimated future amortization expense of purchased intangible assets with finite lives is as follows (in millions):
Years Ending December 31,
Amount
2019
$
25.1

2020
17.2

2021
12.9

2022
7.7

2023
5.3

Thereafter
1.3

Total
$
69.5