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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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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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