Derivative Instruments (Narrative) (Details) - Forward Contracts [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Derivative [Line Items]
Minimum maturity period, foreign currency derivative			30 days
Maximum maturity period, foreign currency derivative			1 year
Gains (losses) on foreign currency forward contracts	$ (2.2)	$ 0.6	$ (1.4)	$ (1.9)

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=64837297&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=64837297&loc=SL5624171-113959

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