CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions		3 Months Ended
		Apr. 30, 2016	Apr. 30, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income		$ (173.0)	$ 19.1
Other comprehensive (loss), net of reclassifications:
Net loss on derivative instruments (net of tax effect of ($1.9) and ($1.5), respectively)		(9.5)	(5.4)
Change in net unrealized gain on available-for-sale securities (net of tax effect of ($0.5) and ($0.1), respectively)		2.3	0.2
Change in defined benefit pension items	[1]	0.3	0.7
Net change in cumulative foreign currency translation gain (net of tax effect of $0.0 and $3.8, respectively)		6.5	1.8
Total other comprehensive (loss)		(0.4)	(2.7)
Total comprehensive (loss) income		$ (173.4)	$ 16.4

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