Employee Benefit and Retirement Plans-Components of Other Postretirement Benefit Expenses (Details) - Other Postretirement Benefit Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.6	$ 0.6	$ 2.0	$ 2.0
Interest costs	0.9	1.0	2.7	2.9
Amortization of prior service costs	(0.3)	0.0	(0.3)
Defined Benefit Plan, Amortization of Gains (Losses)	0.0	0.0	0.1	0.0
Total other postretirement expense	$ 1.2	$ 1.6	$ 4.3	$ 4.9