Business And Summary Of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Jan. 31, 2016
Accounting Policies [Abstract]
Accounts receivable sold	$ 527.9		$ 527.9		$ 554.2
Discount fees on sale of accounts receivable	$ 1.6	$ 0.9	$ 4.3	$ 2.9