Revenue - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Percentage of revenue from service contracts and post-shipment obligations (less than)	3.00%
Percentage of sales to distributors	66.67%
Contract liability	$ 28.4	$ 10.2
Increase in net contract liabilities	18.2
Revenue recognized	8.9
Unsatisfied performance obligation	$ 600.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligation, period of recognition	3 years
Minimum
Disaggregation of Revenue [Line Items]
Sales returns as percentage of gross sales, percent	1.00%
Maximum
Disaggregation of Revenue [Line Items]
Sales returns as percentage of gross sales, percent	2.00%

Percentage Of Revenue From Service Contracts And Post-Shipment Performance Obligations

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Percentage Of Sales To Distributors

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Sales Returns As Percentage Of Gross Sales, Percent

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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