Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 193.8	$ 196.5
Accumulated Amortization	(167.8)	(165.0)
Net Carrying Amount	26.0	31.5
Patents and developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	156.0	158.7
Accumulated Amortization	(140.2)	(141.6)
Net Carrying Amount	15.8	17.1
Distribution rights and others
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9.2	9.2
Accumulated Amortization	(9.2)	(9.1)
Net Carrying Amount	0.0	0.1
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28.6	28.6
Accumulated Amortization	(18.4)	(14.3)
Net Carrying Amount	$ 10.2	$ 14.3

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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