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Financial Instruments - Valuation Techniques and Fair Value Hierarchy Level (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Foreign currency contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Foreign currency contracts, net	$ 21.4	$ (54.4)
Recurring | Foreign currency contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Foreign currency contracts, net	21.4	(54.4)
Recurring | Equity contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Marketable equity securities	40.7	30.2
Level 1 | Recurring
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Marketable equity securities	40.7	30.2
Level 1 | Recurring | Foreign currency contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Foreign currency contracts, net	0.0	0.0
Level 1 | Recurring | Equity contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Marketable equity securities	40.7	30.2
Level 2 | Recurring | Foreign currency contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Foreign currency contracts, net	21.4	(54.4)
Level 2 | Recurring | Equity contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Marketable equity securities	0.0	0.0
Level 3 | Recurring | Foreign currency contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Foreign currency contracts, net	0.0	0.0
Level 3 | Recurring | Equity contract
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Marketable equity securities	$ 0.0	$ 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://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

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+ References

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- Definition

Amount of investments in equity securities and other forms of securities that provide ownership interests expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

No definition available.

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