CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Net sales	$ 1,014.6	$ 1,012.4	$ 3,066.1	$ 3,121.5
Cost of sales	388.9	383.1	1,163.4	1,152.5
Gross profit	625.7	629.3	1,902.7	1,969.0
Selling, general and administrative expenses	507.2	502.9	1,439.1	1,447.1
Earnings from operations	118.5	126.4	463.6	521.9
Interest expense and financing costs	9.2	10.1	29.4	29.7
Other expense, net	4.2	1.8	2.2	5.1
Earnings from operations before income taxes	105.1	114.5	432.0	487.1
Provision for income taxes	26.7	19.6	92.1	105.2
Net earnings	$ 78.4	$ 94.9	$ 339.9	$ 381.9
Net earnings per share:
Basic (usd per share)	$ 0.65	$ 0.78	$ 2.81	$ 3.10
Diluted (usd per share)	$ 0.65	$ 0.77	$ 2.80	$ 3.08
Weighted-average number of common shares:
Basic (shares)	120.3	122.3	121.0	123.3
Diluted (shares)	120.6	123.1	121.3	124.0