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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
The following table summarizes the components of gross intangible asset, accumulated amortization, and net intangible asset balances as of December 31, 2017, and 2016 (in millions):
 
 
December 31, 2017
 
December 31, 2016
 
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Patents and developed technology
 
$
156.0

 
$
(140.2
)
 
$
15.8

 
$
158.7

 
$
(141.6
)
 
$
17.1

Distribution rights and others
 
9.2

 
(9.2
)
 
—

 
9.2

 
(9.1
)
 
0.1

Customer relationships
 
28.6

 
(18.4
)
 
10.2

 
28.6

 
(14.3
)
 
14.3

Total intangible assets
 
$
193.8

 
$
(167.8
)
 
$
26.0

 
$
196.5

 
$
(165.0
)
 
$
31.5
Schedule Of Estimated Future Amortization Expense Of Intangible Assets
The estimated future amortization expense related to intangible assets as of December 31, 2017, is as follows (in millions):
Fiscal Year
Amount
2018
$
9.6

2019
4.6

2020
4.6

2021
3.4

2022
2.1

2023 and thereafter
1.7

Total
$
26.0