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Financial Instruments - Gross Notional Amounts for Outstanding Derivatives (Detail) - Forward contracts - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Derivatives Designated as Hedging Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | $ 128.5 | $ 109.7
Derivatives Not Designated as Hedging Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | 168.4 | 143.7
Prepaid and other current assets | Derivatives Designated as Hedging Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | 0.9 | 6.2
Prepaid and other current assets | Derivatives Not Designated as Hedging Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | 1.2 | 5.6
Other accrued liabilities | Derivatives Designated as Hedging Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | 2.9 | 1.0
Other accrued liabilities | Derivatives Not Designated as Hedging Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | $ 4.6 | $ 0.6

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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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