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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, and 2017 (in millions):
 
 
December 31, 2018
 
December 31, 2017
 
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Patents and developed technology
 
$
158.7

 
$
(144.7
)
 
$
14.0

 
$
156.0

 
$
(140.2
)
 
$
15.8

Distribution rights and others
 
40.2

 
(12.9
)
 
27.3

 
9.2

 
(9.2
)
 
—

Customer relationships
 
48.5

 
(23.1
)
 
25.4

 
28.6

 
(18.4
)
 
10.2

Total intangible assets
 
$
247.4

 
$
(180.7
)
 
$
66.7

 
$
193.8

 
$
(167.8
)
 
$
26.0
Schedule Of Estimated Future Amortization Expense Of Intangible Assets
The estimated future amortization expense related to intangible assets as of December 31, 2018, is as follows (in millions):
Fiscal Year
Amount
2019
$
15.9

2020
15.8

2021
12.5

2022
10.1

2023
6.2

2024 and thereafter
6.2

Total
$
66.7