Restructuring and Severance (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Nov. 30, 2019	Nov. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.1	$ 1.3
Payments for Restructuring	0.5
Restructuring Reserve	1.7			$ 1.1
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.7	1.3
Specialty Solutions [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	0.7
Performance Materials [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.7	0.0
Performance Materials [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4	0.0
Corporate, Non-Segment [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	$ 0.6
2018 restructuring plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.0
2017 restructuring plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1
Scenario, Forecast [Member] | Minimum [Member] | 2018 restructuring plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 5.0
Scenario, Forecast [Member] | Maximum [Member] | 2018 restructuring plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 8.0
Project Life to Date [Member] | 2018 restructuring plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.8
Payments for Restructuring	1.1
Project Life to Date [Member] | 2017 restructuring plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5.3