Hedging Transaction and Derivative Instruments - Gain (Loss) of Derivative Instruments Recognized on Income Statement (Details) - Other nonoperating income (expense) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cash Flow Hedging \| Designated as hedging instrument
Derivative [Line Items]
Derivative, gain (loss) on derivative, net	$ (0.4)	$ 0.1	$ 1.3	$ (0.1)
Economic Hedge \| Not designated as hedging instrument
Derivative [Line Items]
Derivative, gain (loss) on derivative, net	$ (0.5)	$ 0.5	$ (1.4)	$ 0.5

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration