Business Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2019 USD ($)	Aug. 31, 2018 USD ($)	Aug. 31, 2019 segment	Aug. 31, 2019	Aug. 31, 2019 USD ($)	Aug. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2	2
Net sales	$ 192.4	$ 193.6			$ 567.0	$ 578.5
Interest expense	(5.1)	(4.7)			(15.3)	(14.4)
Income (loss) before income taxes	0.9	0.4			2.7	13.4
Specialty Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	137.7				392.7
Performance Materials [Member]
Segment Reporting Information [Line Items]
Net sales	54.7				174.3
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	15.6	11.6			42.9	49.4
Operating Segments [Member] | Specialty Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	137.7	122.1			392.7	360.0
Operating Income (Loss)	20.0	19.5			49.3	55.0
Operating Segments [Member] | Performance Materials [Member]
Segment Reporting Information [Line Items]
Net sales	54.7	71.5			174.3	218.5
Operating Income (Loss)	(4.4)	(7.9)			(6.4)	(5.6)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest expense	(5.1)	(4.7)			(15.3)	(14.4)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate expenses	$ (9.6)	$ (6.5)			$ (24.9)	$ (21.6)