Derivative Instruments (Narrative) (Details) - Forward Contracts [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Derivative [Line Items]
Minimum maturity period, foreign currency derivative			90 days
Maximum maturity period, foreign currency derivative			2 years
Losses on foreign currency forward contracts	$ 1.2	$ 0.8	$ 2.5	$ 1.1