Inventories - Net Inventories (Detail) (USD $) In Millions, unless otherwise specified	Feb. 28, 2013	Nov. 30, 2012
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 48.6	$ 48.6
Work-in-process	7.8	6.4
Finished products	83.5	81.8
Acquired cost of inventories	139.9	136.8
Excess of acquired cost over LIFO cost	(28.4)	(29.9)
Obsolescence reserves	(10.3)	(10.7)
Net Inventories	$ 101.2	$ 96.2