CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income		$ (43.8)	$ 10.7	$ (293.3)	$ 70.3
Other comprehensive (loss) income, net of reclassifications:
Net (loss) gain on derivative instruments (net of tax effect of $0.0, $0.5, ($0.7) and ($0.6), respectively)		(12.1)	21.1	(22.2)	19.6
Change in net unrealized loss on available-for-sale securities (net of tax effect of $0.0, $0.7, $0.2 and $0.7, respectively)		(0.4)	(0.5)	(1.6)	(2.1)
Change in defined benefit pension items	[1]	0.3	0.0	1.3	0.0
Net change in cumulative foreign currency translation loss (net of tax effect of ($4.5), $3.4, $0.0, and $2.9, respectively)		(4.0)	(24.2)	(10.7)	(18.2)
Total other comprehensive loss		(16.2)	(3.6)	(33.2)	(0.7)
Total comprehensive (loss) income		$ (60.0)	$ 7.1	$ (326.5)	$ 69.6

[1] There were no tax effects related to defined benefit pension items for each of the periods presented.