Impact of Fair Value Hedges on Other Comprehensive Income, Accumulated Other Comprehensive Income and Income Statement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2012	May 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ 13.9	$ 12.3	$ 27.4	$ 24.5
Fair Value Hedging | Interest Rate Contract
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ 1.2	$ 1.3	$ 2.4	$ 2.5