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Derivative Contracts - Gain/(Loss) Recognized in Income on Derivative (Details) - Foreign Exchange Contracts - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Not Designated as Hedging Instruments | Change in Fair Value of Derivatives |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | $ 23.5 | $ 3.1
Designated as Hedging Instrument | General and Administrative Expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Foreign exchange contract settlement | 1.7 | 0.3
Designated as Hedging Instrument | Net change from current period hedged transactions |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair Value | $ 0.9 | $ 1.3

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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 + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective. + References 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) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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