Business and Summary of Significant Accounting Policies (Accounts Receivable) (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Business and Summary of Significant Accounting Policies
Accounts Receivable Sold To and Held by Financial Institutions	$ 506.7	$ 554.2
Sale of Accounts Receivable, Discount Fees	$ 6.1	$ 4.4	$ 4.4

[Line Items] for Business and Summary of Significant Accounting Policies [Table]

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