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Fair Value Measurements (Details) - Recurring basis - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value of assets and liabilities measured on recurring basis |  |
Short-term investments | $ 26.7 | $ 34.6
Forward contracts | 11.3 | 2.3
Total | 38.0 | 36.9
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair value of assets and liabilities measured on recurring basis |  |
Short-term investments | 26.7 | 34.6
Total | 26.7 | 34.6
Significant Observable Inputs (Level 2) |  |
Fair value of assets and liabilities measured on recurring basis |  |
Forward contracts | 11.3 | 2.3
Total | $ 11.3 | $ 2.3

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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