Business and Summary of Significant Accounting Policies Accounts Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013		Jan. 31, 2012
Disclosure - Accounts Receivable, Net [Abstract]
Trade accounts receivable	$ 531.1	[1]	$ 432.5	[1]
Less: Allowance for Doubtful Accounts	(5.6)	[1]	(5.4)	[1]
Product Returns Reserve	(4.9)		(5.8)
Partner programs and other obligations	(25.5)	[1]	(26.2)	[1]
Accounts Receivable, Net	$ 495.1		$ 395.1

[1] For comparability, the presentation of the balances at January 31, 2012 was adjusted to align to current year presentation.