Derivative Instruments (Narrative) (Details) - Forward Contracts [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 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	$ 2.3	$ (1.2)	$ 0.8	$ (2.5)