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Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
INTANGIBLE ASSETS
The following table summarizes the components of gross intangible asset, accumulated amortization, and net intangible asset balances as of December 31, 2016, and 2015 (in millions):
 
 
December 31, 2016
 
December 31, 2015
 
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Patents and developed technology
 
$
158.7

 
$
(141.6
)
 
$
17.1

 
$
159.7

 
$
(129.6
)
 
$
30.1

Distribution rights and others
 
9.2

 
(9.1
)
 
0.1

 
9.2

 
(8.0
)
 
1.2

Customer relationships
 
28.6

 
(14.3
)
 
14.3

 
28.6

 
(10.2
)
 
18.4

Total intangible assets
 
$
196.5

 
$
(165.0
)
 
$
31.5

 
$
197.5

 
$
(147.8
)
 
$
49.7


Amortization expense related to intangible assets was $18.2 million, $24.4 million, and $22.4 million for the years ended December 31, 2016, 2015, and 2014, respectively.
The estimated future amortization expense related to intangible assets as of December 31, 2016, is as follows (in millions):
Fiscal Year
Amount
2017
$
12.5

2018
8.6

2019
3.6

2020
3.4

2021
2.3

2022 and thereafter
1.1

Total
$
31.5