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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

X

- 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

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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

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- Definition

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+ References

No definition available.

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