CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Statement [Abstract]
Net sales	$ 1,008.2	$ 1,014.6	$ 2,310.8	$ 3,066.1
Cost of sales	364.7	388.9	896.7	1,163.4
Gross profit	643.5	625.7	1,414.1	1,902.7
Selling, general and administrative expenses	478.5	507.2	1,294.9	1,439.1
Earnings from operations	165.0	118.5	119.2	463.6
Interest expense and financing costs	10.7	9.2	31.6	29.4
Other expense (income), net	5.7	4.2	(20.6)	2.2
Earnings from operations before income taxes	148.6	105.1	108.2	432.0
Provision for income taxes	29.6	26.7	21.9	92.1
Net earnings	$ 119.0	$ 78.4	$ 86.3	$ 339.9
Net earnings per share:
Basic (usd per share)	$ 0.98	$ 0.65	$ 0.71	$ 2.81
Diluted (usd per share)	$ 0.98	$ 0.65	$ 0.71	$ 2.80
Weighted-average number of common shares:
Basic (shares)	121.4	120.3	121.3	121.0
Diluted (shares)	121.7	120.6	121.7	121.3