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Derivatives and Hedging - Derivative Contracts Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Total cost of revenue | Maximum
Derivatives
Recognized gains/losses associated with derivative contracts not designated as hedging instruments		$ 0.1
Deemed embedded derivatives
Derivatives
Total gross notional amount	$ 81.0
Deemed embedded derivatives | Total cost of revenue
Derivatives
Recognized gains/losses associated with derivative contracts not designated as hedging instruments	1.1
Not designated as hedging instrument | Foreign currency contracts
Derivatives
Total gross notional amount	$ 106.0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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