Operating Segments and Related Disclosures - Summary of Sales to U.S. Government and its Agencies (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	May. 31, 2015	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	May. 31, 2015	May. 31, 2014
Revenue, Major Customer [Line Items]
Net sales	$ 456.9	$ 421.2	$ 404.5	$ 332.1	$ 775.5	$ 736.6
U. S. Government Sales [Member]
Revenue, Major Customer [Line Items]
Net sales	$ 396.1		$ 386.5		$ 692.1	$ 698.1
U. S. Government Sales [Member] | Sales Revenue, Net [Member] | Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of Net Sales	87.00%		96.00%		89.00%	95.00%