CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 105.7	$ 104.9	$ 193.2	$ 209.7
Other comprehensive earnings (loss), net of tax
Foreign currency translation adjustments	(24.6)	(31.8)	27.1	(28.2)
Unrealized gain (loss) on marketable securities	0.9	(1.2)	2.0	(0.1)
Unrealized gain (loss) on hedging instruments	8.1	(2.7)	12.4	(7.1)
Net unrealized gain on benefit plans	2.0	4.5	4.4	9.2
Other comprehensive earnings, net of tax	(13.6)	(31.2)	45.9	(26.2)
Comprehensive earnings	$ 92.1	$ 73.7	$ 239.1	$ 183.5