Business Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	May 31, 2019 USD ($)	May 31, 2018 USD ($)	May 31, 2019 segment	May 31, 2019	May 31, 2019 USD ($)	May 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2	2
Net sales	$ 205.7	$ 206.3			$ 374.6	$ 385.0
Interest expense	(5.2)	(4.6)			(10.2)	(9.7)
Income (loss) before income taxes	7.2	10.9			1.8	13.1
Specialty Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	142.3				255.0
Performance Materials [Member]
Segment Reporting Information [Line Items]
Net sales	63.4				119.6
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	20.8	22.0			27.3	37.7
Operating Segments [Member] | Specialty Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	142.3	128.8			255.0	238.0
Operating Income (Loss)	20.0	21.9			29.3	35.5
Operating Segments [Member] | Performance Materials [Member]
Segment Reporting Information [Line Items]
Net sales	63.4	77.5			119.6	147.0
Operating Income (Loss)	0.8	0.1			(2.0)	2.2
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest expense	(5.2)	(4.6)			(10.2)	(9.7)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate expenses	$ (8.4)	$ (6.5)			$ (15.3)	$ (14.9)