CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - 3 months ended Apr. 30, 2016 - 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, 2016	$ 2,929.5	$ 2,012.5	$ (278.1)	$ 1.3	$ 1,175.7	$ 18.1
Beginning Balance, Shares at Jan. 31, 2016	126.8			126.8
Exercise of stock options and vesting of restricted stock units ("RSUs")	$ 8.3	0.0	0.0	$ 0.0	8.3	0.0
Exercise of stock options and vesting of restricted stock units ("RSUs"), shares				0.4
Tax effect of exercise of stock options and vesting of RSUs	(0.6)	0.0	0.0	$ 0.0	(0.6)	0.0
Share-based compensation expense	5.2	0.0	0.0	0.0	5.2	0.0
Purchase and retirement of Common Stock, Value	$ (78.1)	(69.0)	0.0	$ 0.0	(9.1)	0.0
Purchase and retirement of Common Stock, Shares	(1.2)			(1.2)
Cash dividends on Common Stock	$ (50.3)	(50.3)	0.0	$ 0.0	0.0	0.0
Other comprehensive earnings, net of tax	59.5	0.0	59.5	0.0	0.0	0.0
Net earnings	87.5	87.5	0.0	0.0	0.0	0.0
Non-controlling interests	(1.7)	0.0	0.0	0.0	0.0	(1.7)
Ending Balances at Apr. 30, 2016	$ 2,959.3	$ 1,980.7	$ (218.6)	$ 1.3	$ 1,179.5	$ 16.4
Ending Balance, Shares at Apr. 30, 2016	126.0			126.0