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Financial Instruments - Notional Amount, Estimated Fair Value and Related Balance Sheet Classification of Foreign Currency Derivative Contracts (Detail) - Foreign currency contract - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Contracts balance sheet classification: |  |
Derivative, fair value, asset (liability), net | $ (3.4) | $ (22.8)
Notional amount | 2,413.6 | 2,219.6
Designated as hedging instrument | Cash flow hedge |  |
Contracts balance sheet classification: |  |
Other current assets | 14.1 | 16.9
Other long-term assets | 1.4 | 1.3
Other current liabilities | (18.5) | (28.4)
Other long-term liabilities | (6.9) | (8.0)
Derivative, fair value, asset (liability), net | (9.9) | (18.2)
Notional amount | $ 1,298.5 | $ 1,538.5
Designated as hedging instrument | Cash flow hedge | Maximum |  |
Contracts balance sheet classification: |  |
Outstanding maturities in months, not to exceed | 24 months | 24 months
Not designated as hedging instrument |  |
Contracts balance sheet classification: |  |
Other current assets | $ 10.7 | $ 1.8
Other current liabilities | (4.2) | (6.4)
Notional amount | 1,115.1 | 681.1
Other derivatives not designated as hedging instruments at fair value, net | $ 6.5 | $ (4.6)
Not designated as hedging instrument | Maximum |  |
Contracts balance sheet classification: |  |
Outstanding maturities in months, not to exceed | 12 months | 12 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 Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Period remaining until the derivative contract matures, 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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- Definition Net fair value of all derivative instruments not designated as a hedging instrument. + References No definition available. + Details
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