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Derivative Instruments - Narrative (Details) - Foreign currency forward exchange contracts - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional amount | $ 1,100.0 | $ 987.7 | $ 1,480.0
Maximum |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Maximum term for foreign currency forward exchange contracts | 18 months |  |

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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 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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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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- Details
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