CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 87.5	$ 104.9
Other comprehensive earnings (loss), net of tax
Foreign currency translation adjustments	51.7	3.6
Unrealized gain on marketable securities	1.2	1.1
Unrealized gain (loss) on hedging instruments	4.3	(4.4)
Net unrealized gain on benefit plans	2.3	4.7
Other comprehensive earnings, net of tax	59.5	5.0
Comprehensive earnings	$ 147.0	$ 109.9