Business Segment Information - Schedule of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Sales	$ 191.3	$ 193.6	$ 206.3	$ 178.7	$ 186.3	$ 200.9	$ 221.3	$ 174.6	$ 769.8	$ 783.1	$ 759.9
Total segment operating profit									60.9	47.3	68.3
Interest expense									(19.3)	(21.5)	(24.7)
Corporate severance	(1.7)	(0.3)	(0.2)	(1.3)	(0.6)	(0.4)	(3.6)	(1.0)	(3.5)	(5.7)	(11.1)
Asset impairments	(3.9)	(9.2)	(0.4)	0.0	(19.6)	(0.4)	(12.9)	0.0	(13.5)	(32.9)	(5.7)
Acquisition and integration related expense									(4.1)	(0.3)	(0.9)
Gain on sale of assets	(0.9)	0.0	0.0	0.0	$ (0.4)	$ 0.0	$ 0.0	$ 0.0	0.9	(0.4)	(0.3)
Debt issuance costs write-off	$ 0.0	$ 0.0	$ 0.0	$ (0.8)					(0.8)	0.0	(2.9)
Income (loss) before income taxes									14.5	(4.1)	9.9
Specialty Solutions [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Asset impairments									(1.1)	(0.3)	(0.2)
Performance Materials [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operational improvement costs											(0.4)
Asset impairments									(14.3)	(33.6)	(4.2)
Acquisition and integration related expense											(1.1)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment operating profit									60.9	47.3	68.3
Operating Segments [Member] | Specialty Solutions [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Sales									487.6	441.4	404.3
Total segment operating profit									70.7	59.9	59.8
Operating Segments [Member] | Performance Materials [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net Sales									282.2	341.7	355.6
Total segment operating profit									(9.8)	(12.6)	8.5
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense									(19.3)	(21.5)	(24.7)
Operational improvement costs									0.0	0.0	0.8
Asset impairments									(0.1)	(1.8)	0.0
Acquisition and integration related expense									(2.2)	(0.3)	(0.9)
Gain on sale of assets									0.9	0.0	0.0
Debt issuance costs write-off									(0.8)	0.0	(2.9)
Pension settlement									0.0	(0.4)	0.0
Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate expenses									(24.0)	(24.5)	(25.8)
Corporate severance									$ (0.9)	$ (2.9)	$ (4.9)