Fair Value of Financial Instruments - Additional Information (Details) - Forward Contracts - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative, notional amount	$ 357.4	$ 251.6
Accrued expenses
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value foreign currency forward contracts, liabilities	5.0	0.2
Other (expenses) income, net
Fair Value, Option, Quantitative Disclosures [Line Items]
Recognized gains (losses) of foreign currency forward contracts	4.6	16.1	$ (38.5)
Other, net
Fair Value, Option, Quantitative Disclosures [Line Items]
Change in the fair value of foreign currency forward contracts	(4.6)	(16.1)	38.5
Cash receipts	$ 9.4	$ 16.0
Cash (settlements)			$ (37.6)

The change in the fair value of foreign currency forward contracts that are not designated as hedging instruments.

No definition available.

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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

The amount of cash received during the period on settlement of a hedge.

+ References

No definition available.

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- Definition

The premium (cost) of a hedge, net of any cash received on settlement during the period.

+ References

No definition available.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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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.

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- Definition

Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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