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Derivatives and Hedging - Derivative Contracts Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
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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 |

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- 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 + Details
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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 + Details
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