CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Income Statement [Abstract]
Net sales	$ 555.5	$ 1,003.1
Cost of sales	246.5	383.9
Gross profit	309.0	619.2
Selling, general and administrative expenses	414.4	458.3
(Loss) earnings from operations	(105.4)	160.9
Interest expense and financing costs	9.8	10.4
Other income, net	(25.4)	(1.0)
(Loss) earnings from operations before income taxes	(89.8)	151.5
(Benefit) provision for income taxes	(25.2)	26.3
Net (loss) earnings	$ (64.6)	$ 125.2
Net earnings per share:
Basic (usd per share)	$ (0.53)	$ 1.03
Diluted (usd per share)	$ (0.53)	$ 1.03
Weighted-average number of common shares:
Basic (shares)	121.2	121.4
Diluted (shares)	121.2	121.9