CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Income Statement [Abstract]
Net sales	$ 1,003.1	$ 1,033.2
Cost of sales	383.9	382.3
Gross profit	619.2	650.9
Selling, general and administrative expenses	458.3	446.6
Earnings from operations	160.9	204.3
Interest expense and financing costs	10.4	9.9
Other (income) expense, net	(1.0)	3.9
Earnings from operations before income taxes	151.5	190.5
Provision for income taxes	26.3	48.2
Net earnings	$ 125.2	$ 142.3
Net earnings per share:
Basic (usd per share)	$ 1.03	$ 1.14
Diluted (usd per share)	$ 1.03	$ 1.14
Weighted-average number of common shares:
Basic (shares)	121.4	124.4
Diluted (shares)	121.9	125.0