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, 2014	Feb. 28, 2013
Other postretirement benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.0	$ 1.3
Interest costs	1.0	1.0
Amortization of prior service costs	0	(0.3)
Amortization of losses	0	0.4
Total other postretirement expense	$ 2.0	$ 2.4