Restructuring and Severance (Schedule of Restructuring and Severance Activities) (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]
Restructuring and severance	$ 6.2	$ 0.4	$ 1.1	$ 1.6	$ 1.4	$ 3.4	$ 1.1	$ 0.0	$ 11.1	$ 5.9	$ 0.9
Restructuring Reserve [Roll Forward]
Beginning Balance				2.3					2.3
Provision									11.1
Payments									9.2
Ending Balance	4.2				2.3				4.2	2.3
Performance Chemicals [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									2.7	4.3
Restructuring Reserve [Roll Forward]
Beginning Balance				1.4					1.4
Provision									5.5
Payments									6.5
Ending Balance	0.4				1.4				0.4	1.4
Engineered Surfaces [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance										1.5
Restructuring Reserve [Roll Forward]
Beginning Balance				0.8					0.8
Provision									0.7
Payments									1.5
Ending Balance	0.0				0.8				0.0	0.8
Corporate [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance				$ 0.1					0.1
Provision									4.9
Payments									1.2
Ending Balance	$ 3.8				$ 0.1				3.8	0.1
Employee Severance [Member] | Performance Chemicals [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									2.9	4.3	0.5
Employee Severance [Member] | Engineered Surfaces [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									0.6	1.5	0.4
Employee Severance [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance									4.9	0.1
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Business Exit Costs									2.7	$ 0.0	$ 0.1
Facility Closing [Member] | Performance Chemicals [Member]
Restructuring Cost and Reserve [Line Items]
Business Exit Costs									2.6
Facility Closing [Member] | Engineered Surfaces [Member]
Restructuring Cost and Reserve [Line Items]
Business Exit Costs									$ 0.1