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, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013
Other postretirement benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.0	$ 1.3	$ 2.8	$ 3.8
Interest costs	1.0	1.0	3.1	3.0
Amortization of prior service costs	0	(0.3)	0	(0.9)
Amortization of losses	0	0.3	0	1.0
Total other postretirement expense	$ 2.0	$ 2.3	$ 5.9	$ 6.9