CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Retained Earnings	Accumulated Other Comprehensive Loss	Common Stock	Additional Paid-In Capital	Non- Controlling Interests	Cumulative effect adjustment from adoption of new accounting standards	Cumulative effect adjustment from adoption of new accounting standards Retained Earnings	Cumulative effect adjustment from adoption of new accounting standards Accumulated Other Comprehensive Loss
Beginning balance at Jan. 31, 2019	$ 3,130.9	$ 2,045.6	$ (204.8)	$ 1.2	$ 1,275.4	$ 13.5	$ 21.8	$ 47.8	$ (26.0)
Beginning balance (shares) at Jan. 31, 2019				121.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of restricted stock units	4.3			$ 0.3	4.3
Shares withheld related to net share settlement of share-based compensation	(9.6)				(9.6)
Shares withheld related to net share settlement of share-based compensation (shares)				(0.1)
Share-based compensation expense	20.0				20.0
Purchase and retirement of Common Stock	$ (163.4)	(148.0)			(15.4)
Purchase and retirement of Common Stock (shares)	(1.8)			(1.8)
Cash dividends on Common Stock	$ (206.7)	(206.7)
Accrued dividends on share-based awards	(1.6)	(1.9)			0.3
Other comprehensive earnings, net of tax	7.8		7.8
Net earnings	339.9	339.9
Non-controlling interests	(0.9)					(0.9)
Ending balance at Oct. 31, 2019	$ 3,142.5	2,076.7	(223.0)	$ 1.2	1,275.0	12.6
Ending balance (shares) at Oct. 31, 2019	119.9			119.9
Beginning balance at Jul. 31, 2019	$ 3,193.1	2,139.4	(237.0)	$ 1.2	1,276.5	13.0
Beginning balance (shares) at Jul. 31, 2019				120.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of restricted stock units	1.7				1.7
Shares withheld related to net share settlement of share-based compensation	(0.5)				(0.5)
Share-based compensation expense	4.8				4.8
Purchase and retirement of Common Stock	$ (78.0)	(70.4)			(7.6)
Purchase and retirement of Common Stock (shares)	(0.9)			(0.9)
Cash dividends on Common Stock	$ (69.7)	(69.7)
Accrued dividends on share-based awards	(0.9)	(1.0)			0.1
Other comprehensive earnings, net of tax	14.0		14.0
Net earnings	78.4	78.4
Non-controlling interests	(0.4)					(0.4)
Ending balance at Oct. 31, 2019	$ 3,142.5	2,076.7	(223.0)	$ 1.2	1,275.0	12.6
Ending balance (shares) at Oct. 31, 2019	119.9			119.9
Beginning balance at Jan. 31, 2020	$ 3,335.4	2,207.6	(273.2)	$ 1.2	1,387.3	12.5	$ (2.5)	$ (2.5)
Beginning balance (shares) at Jan. 31, 2020	121.2			121.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of restricted stock units	$ 7.0			$ 0.3	7.0
Shares withheld related to net share settlement of share-based compensation	(10.6)				(10.6)
Shares withheld related to net share settlement of share-based compensation (shares)				(0.1)
Share-based compensation expense	$ 23.6				23.6
Purchase and retirement of Common Stock (shares)	0.0
Cash dividends on Common Stock	$ (211.1)	(211.1)
Accrued dividends on share-based awards	(0.5)	(1.7)			1.2
Other comprehensive earnings, net of tax	52.1		52.1
Net earnings	86.3	86.3
Non-controlling interests	(1.0)					(1.0)
Ending balance at Oct. 31, 2020	$ 3,278.7	2,078.6	(221.1)	$ 1.2	1,408.5	11.5
Ending balance (shares) at Oct. 31, 2020	121.4			121.4
Beginning balance at Jul. 31, 2020	$ 3,207.7	2,030.7	(232.2)	$ 1.2	1,396.1	11.9
Beginning balance (shares) at Jul. 31, 2020				121.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of restricted stock units	3.0				3.0
Shares withheld related to net share settlement of share-based compensation	(0.3)				(0.3)
Share-based compensation expense	$ 9.6				9.6
Purchase and retirement of Common Stock (shares)	0.0
Cash dividends on Common Stock	$ (70.4)	(70.4)
Accrued dividends on share-based awards	(0.6)	(0.7)			0.1
Other comprehensive earnings, net of tax	11.1		11.1
Net earnings	119.0	119.0
Non-controlling interests	(0.4)					(0.4)
Ending balance at Oct. 31, 2020	$ 3,278.7	$ 2,078.6	$ (221.1)	$ 1.2	$ 1,408.5	$ 11.5
Ending balance (shares) at Oct. 31, 2020	121.4			121.4