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
	Feb. 28, 2013	Feb. 29, 2012
Other postretirement benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.3	$ 1.1
Interest costs	1.0	1.2
Amortization of prior service costs	(0.3)	(1.0)
Amortization of losses	0.4	0
Total other postretirement expense	$ 2.4	$ 1.3