Interest And Other Income, net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2012
Interest and Other Income, net [Abstract]
Interest and investment (expense) income, net	$ (9.8)	[1]	$ 4.9	[1]	$ 5.4	[1]
Gain (loss) on foreign currency	4.0		1.2		(1.1)
(Loss) gain on strategic investments	(1.8)	[1]	(4.0)	[1]	0.3	[1]
Other income	2.7		2.0		2.7
Interest and other (expense) income, net	$ (4.9)		$ 4.1		$ 7.3

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