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Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 266.7	$ 693.6
Revenue, performance obligation, description of timing		We generally do not have any contracts or performance obligations with a term of more than one year.
Deferred revenue, revenue recognized	5.0	$ 1.9
Minimum
Disaggregation of Revenue [Line Items]
Receivables, payment terms		30 days
Maximum
Disaggregation of Revenue [Line Items]
Receivables, payment terms		60 days
United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	202.4	$ 537.4
Outside of the United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	64.3	156.2
Distributor
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	154.6	431.3
Direct
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 112.1	$ 262.3

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response))
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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