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Financial Instruments - Valuation Techniques and Fair Value Hierarchy Level (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Marketable Securities, Equity Securities | $ 45.6 | $ 43.8
Foreign currency contract |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Foreign currency derivative contracts, net | 31.1 | (22.8)
Recurring |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Marketable Securities, Equity Securities | 45.6 | 43.8
Recurring | Foreign currency contract |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Foreign currency derivative contracts, net | 31.1 | (22.8)
Level 1 | Recurring |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Marketable Securities, Equity Securities | 45.6 | 43.8
Level 1 | Recurring | Foreign currency contract |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Foreign currency derivative contracts, net | 0.0 | 0.0
Level 2 | Recurring |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Marketable Securities, Equity Securities | 0.0 | 0.0
Level 2 | Recurring | Foreign currency contract |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Foreign currency derivative contracts, net | 31.1 | (22.8)
Level 3 | Recurring |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Marketable Securities, Equity Securities | 0.0 | 0.0
Level 3 | Recurring | Foreign currency contract |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Foreign currency derivative contracts, net | $ 0.0 | $ 0.0

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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://www.xbrl.org/2003/role/presentationRef -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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- Definition For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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