Restructuring and Severance - Schedule of Costs by Segment and Type (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and severance	$ 0.6	$ 0.8	$ 2.8	$ 1.1	$ 1.7	$ 0.3	$ 0.2	$ 1.3	$ 5.3	$ 3.5	$ 5.7
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									2.9	2.7	5.2
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									2.4	0.8	0.5
Specialty Solutions [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									0.4	0.7	0.6
Specialty Solutions [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									0.0	0.0	0.0
Performance Materials [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									2.2	1.1	1.7
Performance Materials [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									2.4	0.8	0.5
Corporate, Non-Segment [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									$ 0.3	$ 0.9	$ 2.9