CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Non-controlling Interests [Member]
Beginning Balances at Jan. 31, 2013	$ 2,611.3	$ 1,671.3	$ (93.9)	$ 1.3	$ 1,020.0	$ 12.6
Beginning Balance, Shares at Jan. 31, 2013				126.9
Exercise of stock options and vesting of restricted stock units ("RSUs")	27.9	0.0	0.0	$ 0.0	27.9	0.0
Exercise of stock options and vesting of restricted stock units ("RSUs"), shares				1.4
Tax effect of exercise of stock options and vesting of RSUs	14.9	0.0	0.0	$ 0.0	14.9	0.0
Share-based compensation expense	32.5	0.0	0.0	0.0	32.5	0.0
Issuance Of Common Stock Under EPSRS Plan	$ 0.0
Purchase and retirement of Common Stock, Shares	0.0
Cash dividends on Common Stock	$ (170.2)	(170.2)	0.0	0.0	0.0	0.0
Other comprehensive earnings (loss), net of tax	35.3	0.0	35.3	0.0	0.0	0.0
Net earnings	181.4	181.4	0.0	0.0	0.0	0.0
Non-controlling interests	0.9	0.0	0.0	0.0	0.0	0.9
Ending Balances at Jan. 31, 2014	2,734.0	1,682.5	(58.6)	$ 1.3	1,095.3	13.5
Ending Balance, Shares at Jan. 31, 2014				128.3
Exercise of stock options and vesting of restricted stock units ("RSUs")	36.9	0.0	0.0	$ 0.0	36.9	0.0
Exercise of stock options and vesting of restricted stock units ("RSUs"), shares				1.3
Tax effect of exercise of stock options and vesting of RSUs	14.1	0.0	0.0	$ 0.0	14.1	0.0
Share-based compensation expense	26.7	0.0	0.0	$ 0.0	26.7	0.0
Issuance Of Common Stock Under EPSRS Plan	3.9	0.0	0.0		3.9	0.0
Issuance Of Shares Common Stock Under Employee Profit Sharing And Retirement Savings (EPSRS) Plan				0.0
Purchase and retirement of Common Stock, Value	$ (27.0)	(24.8)	0.0	$ 0.0	(2.2)	0.0
Purchase and retirement of Common Stock, Shares	(0.3)			(0.3)
Cash dividends on Common Stock	$ (191.2)	(191.2)	0.0	$ 0.0	0.0	0.0
Other comprehensive earnings (loss), net of tax	(231.9)	0.0	(231.9)	0.0	0.0	0.0
Net earnings	484.2	484.2	0.0	0.0	0.0	0.0
Redemption of non-controlling interest	0.0			0.0	(1.1)	1.1
Non-controlling interests	1.0	0.0	0.0	0.0	0.0	1.0
Ending Balances at Jan. 31, 2015	$ 2,850.7	1,950.7	(290.5)	$ 1.3	1,173.6	15.6
Ending Balance, Shares at Jan. 31, 2015	129.3			129.3
Exercise of stock options and vesting of restricted stock units ("RSUs")	$ 0.3	0.0	0.0	$ 0.0	0.3	0.0
Exercise of stock options and vesting of restricted stock units ("RSUs"), shares				0.3
Tax effect of exercise of stock options and vesting of RSUs	2.1	0.0	0.0	$ 0.0	2.1	0.0
Share-based compensation expense	24.8	0.0	0.0	0.0	24.8	0.0
Issuance Of Common Stock Under EPSRS Plan	0.0
Purchase and retirement of Common Stock, Value	$ (220.4)	(198.7)	0.0	$ 0.0	(21.7)	0.0
Purchase and retirement of Common Stock, Shares	(2.8)			(2.8)
Cash dividends on Common Stock	$ (203.4)	(203.4)	0.0	$ 0.0	0.0	0.0
Other comprehensive earnings (loss), net of tax	12.4	0.0	12.4	0.0	0.0	0.0
Net earnings	463.9	463.9	0.0	0.0	0.0	0.0
Redemption of non-controlling interest	(2.2)	0.0	0.0	0.0	(3.4)	1.2
Non-controlling interests	1.3	0.0	0.0	0.0	0.0	1.3
Ending Balances at Jan. 31, 2016	$ 2,929.5	$ 2,012.5	$ (278.1)	$ 1.3	$ 1,175.7	$ 18.1
Ending Balance, Shares at Jan. 31, 2016	126.8			126.8