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, 2015	Feb. 28, 2014
Other postretirement benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.8	$ 1.0
Interest costs	0.9	1.0
Total other postretirement expense	$ 1.7	$ 2.0