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, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.6	$ 0.6	$ 1.8	$ 2.0
Interest costs	0.6	0.9	1.8	2.7
Amortization of prior service costs	(2.2)	(0.3)	(6.5)	(0.3)
Defined Benefit Plan, Amortization of Gain (Loss)	0.0	0.0	0.0	0.1
Total other postretirement expense	$ (1.0)	$ 1.2	$ (2.9)	$ 4.3