Accumulated Other Comprehensive (Loss) Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2012
Disclosure - Accumulated Other Comprehensive Income (Loss), Net of Taxes [Abstract]
Net gain on derivative instruments	$ 3.5		$ 2.8		$ 9.2
Net unrealized gain on available-for-sale securities	1.8	[1]	2.9	[1]	1.4	[1]
Defined benefit pension items	(7.7)	[1]	(13.1)	[1]	(7.8)	[1]
Foreign currency translation adjustments	1.8	[1]	1.7	[1]	3.1	[1]
Accumulated other comprehensive (loss)	(0.6)		(5.7)		5.9
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 12.9

[1] For comparability, the presentation of the balances at January 31, 2013 and January 31, 2012 were adjusted to align with current year presentation.