Restructuring and Severance Restructuring and Severance (Schedule of Restructuring and Severance Charges) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Restructuring Cost and Reserve [Line Items]
Document Fiscal Year Focus									2016
Closure costs	$ 6.2	$ 0.4	$ 1.1	$ 1.6	$ 1.4	$ 3.4	$ 1.1	$ 0.0	$ 11.1	$ 5.9	$ 0.9
Payments									9.2
Restructuring Reserve	4.2				2.3				4.2	2.3
Restructuring Reserve, Accrual Adjustment									11.1
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs									8.4	5.9	0.8
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Business Exit Costs									2.7	0.0	0.1
Performance Chemicals [Member]
Restructuring Cost and Reserve [Line Items]
Closure costs									2.7	4.3
Payments									6.5
Restructuring Reserve	0.4				1.4				0.4	1.4
Restructuring Reserve, Accrual Adjustment									5.5
Performance Chemicals [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Closure costs									2.9	4.3	0.5
Performance Chemicals [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Business Exit Costs									2.6
Engineered Surfaces [Member]
Restructuring Cost and Reserve [Line Items]
Closure costs										1.5
Payments									1.5
Restructuring Reserve	0.0				0.8				0.0	0.8
Restructuring Reserve, Accrual Adjustment									0.7
Engineered Surfaces [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Closure costs									0.6	1.5	0.4
Other Restructuring Costs											$ 0.4
Engineered Surfaces [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Business Exit Costs									0.1
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Payments									1.2
Restructuring Reserve	$ 3.8				$ 0.1				3.8	0.1
Restructuring Reserve, Accrual Adjustment									4.9
Corporate [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Closure costs									$ 4.9	$ 0.1