Business Segment Information - Schedule of Operating Profit (Loss) from Segments to Consolidated (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	Feb. 28, 2017	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Sales	$ 169.2	$ 192.4	$ 205.7	$ 168.9	$ 191.3	$ 193.6	$ 206.3	$ 178.7		$ 736.2	$ 769.8	$ 783.1
Total segment operating profit										50.4	60.9	47.3
Interest expense										(20.0)	(19.3)	(21.5)
Amounts reclassified from accumulated other comprehensive income (loss)										(21.2)	(4.3)	2.3
Merger transaction costs								0.0	$ 0.0	(9.4)
Corporate severance	(0.6)	(0.8)	(2.8)	(1.1)	(1.7)	(0.3)	(0.2)	(1.3)		(5.3)	(3.5)	(5.7)
Asset impairments	(6.8)	(1.0)	0.0	0.0	(3.9)	(9.2)	(0.4)	0.0		(7.8)	(13.5)	(32.9)
Acquisition and integration related expense										(10.1)	(4.1)	(0.3)
Gain (loss) on sale of assets	(3.9)	0.1	0.0	0.0	$ 0.9	$ 0.0	$ 0.0	0.0		4.0	0.9	(0.4)
Debt issuance costs write-off	$ 0.0	$ (0.2)	$ 0.0	$ 0.0				(0.8)		(0.2)	(0.8)	0.0
Income (loss) before income taxes										(19.0)	14.5	(4.1)
Specialty Solutions [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Sales										513.0
Asset impairments											(1.1)	(0.3)
Performance Materials [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Sales										223.2
Asset impairments										(10.7)	(14.3)	(33.6)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment operating profit										50.4	60.9	47.3
Operating Segments [Member] | Specialty Solutions [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Sales										513.0	487.6	441.4
Total segment operating profit										66.2	70.7	59.9
Operating Segments [Member] | Performance Materials [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Sales										223.2	282.2	341.7
Total segment operating profit										(15.8)	(9.8)	(12.6)
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense										(20.0)	(19.3)	(21.5)
Operational improvement costs										(0.3)	0.0	0.0
Asset impairments										(0.1)	(0.1)	(1.8)
Acquisition and integration related expense										0.1	(2.2)	(0.3)
Gain (loss) on sale of assets										(0.2)	0.9	0.0
Debt issuance costs write-off										(0.2)	(0.8)	0.0
Pension settlement										0.0	0.0	(0.4)
Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate expenses										(21.1)	(24.0)	(24.5)
Corporate severance										(0.3)	(0.9)	(2.9)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)								$ 0.0	$ 0.0	$ (17.9)	$ 0.0	$ 6.3