Business and Summary of Significant Accounting Policies Business and Summary of Significant Accounting Policies (Accounts Receivable) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Business and Summary of Significant Accounting Policies [Line Items]
Accounts Receivable Sold To and Held by Financial Institutions	$ 554.2	$ 310.9
Sale of Accounts Receivable, Discount Fees	$ 4.4	$ 4.4	$ 3.4