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Goodwill and Purchased Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
The following table presents the goodwill activity (in millions):
 
Total
December 31, 2015
$
2,981.3

Additions due to business combinations
100.4

December 31, 2016
3,081.7

Additions due to business combination
16.7

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


________________________________
(*) Other primarily consists of certain purchase accounting adjustments related to the acquisition of BTI.
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, 2017
 
As of December 31, 2016
 
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
$
640.3

 
$
(518.1
)
 
$
(49.9
)
 
$
72.3

 
$
624.9

 
$
(504.2
)
 
$
(49.9
)
 
$
70.8

  Customer contracts, support agreements, and related relationships
83.6

 
(74.1
)
 
(2.8
)
 
6.7

 
83.6

 
(70.8
)
 
(2.8
)
 
10.0

  Other
2.0

 
(1.9
)
 
—

 
0.1

 
2.0

 
(1.6
)
 
—

 
0.4

    Total
725.9

 
(594.1
)
 
(52.7
)
 
79.1

 
710.5

 
(576.6
)
 
(52.7
)
 
81.2

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  IPR&D
49.0

 
—

 
—

 
49.0

 
49.0

 
—

 
—

 
49.0

Total purchased intangible assets
$
774.9

 
$
(594.1
)
 
$
(52.7
)
 
$
128.1

 
$
759.5

 
$
(576.6
)
 
$
(52.7
)
 
$
130.2
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, 2017
 
As of December 31, 2016
 
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
$
640.3

 
$
(518.1
)
 
$
(49.9
)
 
$
72.3

 
$
624.9

 
$
(504.2
)
 
$
(49.9
)
 
$
70.8

  Customer contracts, support agreements, and related relationships
83.6

 
(74.1
)
 
(2.8
)
 
6.7

 
83.6

 
(70.8
)
 
(2.8
)
 
10.0

  Other
2.0

 
(1.9
)
 
—

 
0.1

 
2.0

 
(1.6
)
 
—

 
0.4

    Total
725.9

 
(594.1
)
 
(52.7
)
 
79.1

 
710.5

 
(576.6
)
 
(52.7
)
 
81.2

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  IPR&D
49.0

 
—

 
—

 
49.0

 
49.0

 
—

 
—

 
49.0

Total purchased intangible assets
$
774.9

 
$
(594.1
)
 
$
(52.7
)
 
$
128.1

 
$
759.5

 
$
(576.6
)
 
$
(52.7
)
 
$
130.2
Estimated Future Amortization Expense of Purchased Intangible Assets with Finite Lives
As of December 31, 2017, the estimated future amortization expense of purchased intangible assets with finite lives is as follows (in millions):
Years Ending December 31,
Amount
2018
$
17.5

2019
17.3

2020
17.2

2021
12.9

2022
7.7

Thereafter
6.5

Total
$
79.1