CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 119.0	$ 78.4	$ 86.3	$ 339.9
Other comprehensive earnings, net of tax
Foreign currency translation adjustments	7.3	3.1	28.2	(23.8)
Unrealized (loss) gain on hedging instruments	(0.4)	8.9	11.3	25.3
Unrealized gain on benefit plans	4.2	2.0	12.6	6.3
Total other comprehensive earnings, net of tax	11.1	14.0	52.1	7.8
Comprehensive earnings	$ 130.1	$ 92.4	$ 138.4	$ 347.7