Asset Sales & Impairment Asset Sales & impairment (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	Nov. 30, 2013
Schedule of Asset Impairment [Line Items]
Asset impairment	$ 5.4	$ 0.0	$ 0.0	$ 0.3	$ 18.3	$ 0.5	$ 0.6	$ 0.0	$ 5.7	$ 19.4	$ 0.0
Proceeds from Sale of Property, Plant, and Equipment									5.2
Cash and Cash Equivalents, at Carrying Value	78.0				44.9				78.0	44.9	99.5	$ 164.9
Accounts receivable, net	99.5				105.3				99.5	105.3
Inventories	77.0				81.9				77.0	81.9
Total Current Assets	273.9				250.9				273.9	250.9
Total Assets	693.2				687.2				693.2	687.2	829.2
Accounts payable	73.3				72.0				73.3	72.0
Total Current Liabilities	113.3				112.5				113.3	112.5
Deferred income taxes	11.4				9.5				11.4	9.5
Total Liabilities	583.4				578.1				583.4	578.1
Performance Chemicals India [Member]
Schedule of Asset Impairment [Line Items]
Cash and Cash Equivalents, at Carrying Value					1.0					1.0
Accounts receivable, net					0.2					0.2
Other Assets, Current					0.8					0.8
Inventories					0.2					0.2
Total Current Assets					2.2					2.2
Deferred Tax Assets, Net, Current					2.8					2.8
Total Assets					5.0					5.0
Short-term Debt					1.5					1.5
Accounts payable					0.8					0.8
Accounts Payable, Other, Current					1.8					1.8
Total Current Liabilities					4.1					4.1
Deferred income taxes					3.0					3.0
Liabilities, Noncurrent					0.3					0.3
Total Liabilities					7.4					7.4
Engineered Surfaces [Member]
Schedule of Asset Impairment [Line Items]
Asset impairment				$ 0.3					5.4	0.5
Total Assets	162.3				158.4				162.3	158.4	170.9
Performance Chemicals [Member]
Schedule of Asset Impairment [Line Items]
Asset impairment										18.3
Total Assets	$ 451.2				$ 469.4				451.2	469.4	$ 535.8
Corporation [Member]
Schedule of Asset Impairment [Line Items]
Asset impairment										$ 0.6
Property, Plant and Equipment [Member]
Schedule of Asset Impairment [Line Items]
Asset impairment									5.2
Other Intangible Assets [Member]
Schedule of Asset Impairment [Line Items]
Asset impairment									$ 0.2