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Financial Instruments - Valuation Techniques and Fair Value Hierarchy Level (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Foreign currency contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | $ (3.4) | $ (22.8)
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Marketable equity securities | 47.5 | 43.8
Recurring | Foreign currency contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | (3.4) | (22.8)
Recurring | Interest rate swap |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | (2.9) |
Level 1 | Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Marketable equity securities | 47.5 | 43.8
Level 1 | Recurring | Foreign currency contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | 0.0 | 0.0
Level 1 | Recurring | Interest rate swap |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | 0.0 |
Level 2 | Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Marketable equity securities | 0.0 | 0.0
Level 2 | Recurring | Foreign currency contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | (3.4) | (22.8)
Level 2 | Recurring | Interest rate swap |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | (2.9) |
Level 3 | Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Marketable equity securities | 0.0 | 0.0
Level 3 | Recurring | Foreign currency contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | 0.0 | $ 0.0
Level 3 | Recurring | Interest rate swap |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, fair value, asset (liability), net | $ 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://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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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + 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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