Derivative Instruments (Narrative) (Details) (Forward Contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013
Forward Contracts [Member]
Derivative [Line Items]
Maximum maturity period, foreign currency derivative (in days)			90 days
Gains (losses) on foreign currency forward contracts	$ 0.4	$ (1.3)	$ 1.5	$ (0.8)