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		6 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Other postretirement benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.2	$ 1.1	$ 2.5	$ 2.2
Interest costs	1.0	1.2	2.0	2.4
Amortization of prior service costs	(0.3)	(1.0)	(0.6)	(2.0)
Amortization of losses	0.3	0.1	0.7	0.1
Total other postretirement expense	$ 2.2	$ 1.4	$ 4.6	$ 2.7