Employee Benefit and Retirement Plans - Components of Other Postretirement Benefit Expenses (Details) - Other Postretirement Benefit Plan - USD ($) $ in Millions	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.5	$ 0.5
Interest costs	0.4	0.5
Amortization of prior service costs	(0.1)	(1.1)
Defined Benefit Plan, Amortization of Gain (Loss)	0.0	0.1
Total other postretirement expense	$ 0.8	$ (0.2)