Financial Instruments- Impact of Fair Value Hedges on Other Comprehensive Income, Accumulated Other Comprehensive Income and Income Statement (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ 13.2	$ 13.1	$ 40.7	$ 37.6
Interest rate contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ 1.1	$ 1.2	$ 3.5	$ 3.7