Employee Benefit and Retirement Plans-Components of Other Postretirement Benefit Expenses (Details) (Other postretirement benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012
Other postretirement benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.3	$ 0.9	$ 3.8	$ 3.0
Interest costs	1.0	1.1	3.0	3.6
Amortization of prior service costs	(0.3)	(1.0)	(0.9)	(3.0)
Amortization of losses	0.3	(0.1)	1.0	0
Total other postretirement expense	$ 2.3	$ 0.9	$ 6.9	$ 3.6