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Financial Instruments - Notional Values and Estimated Fair Values of Foreign Currency Derivative Contracts (Details) - Foreign exchange contract - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional amount	$ 1,818.0	$ 1,331.0
Contracts designated as cash flow hedges, fair value	(50.9)	(36.6)
Designated as hedging instrument
Derivative [Line Items]
Contracts designated as cash flow hedges, fair value	(46.4)	(37.7)
Not designated as hedging instrument
Derivative [Line Items]
Notional amount	423.4	170.1
Contracts designated as cash flow hedges, fair value	(4.5)	1.1
Contracts not designated as hedging instruments, fair value	$ (4.5)	$ 1.1
Derivative maturities	12 months	12 months
Cash flow hedging | Designated as hedging instrument
Derivative [Line Items]
Notional amount	$ 1,394.6	$ 1,160.9
Contracts designated as cash flow hedges, fair value	$ (46.4)	$ (37.7)
Derivative maturities	24 months	24 months

X

- 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

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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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X

- Definition

High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Net fair value of all derivative instruments not designated as a hedging instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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