CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) 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, 2015	$ 2,850.7	$ 1,950.7	$ (290.5)	$ 1.3	$ 1,173.6	$ 15.6
Beginning Balance, Shares at Jan. 31, 2015	129.3			129.3
Exercise of stock options and vesting of restricted stock units ("RSUs")	(1.1)	0	0	0	(1.1)	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	1.7	0	0	0	1.7	0
Share-based compensation expense	6.8	0	0	0	6.8	0
Purchase and retirement of Common Stock, Value	(33.1)	(30.2)	0	0	(2.9)	0
Purchase and retirement of Common Stock, Shares	(0.4)			(0.4)
Cash dividends on Common Stock	(49.2)	(49.2)	0	0	0	0
Other comprehensive earnings, net of tax	5.0	0	5.0	0	0	0
Net earnings	104.9	104.9	0	0	0	0
Non-controlling interests	0.6	0	0	0	0	0.6
Ending Balances at Apr. 30, 2015	$ 2,886.3	$ 1,976.2	$ (285.5)	$ 1.3	$ 1,178.1	$ 16.2
Ending Balance, Shares at Apr. 30, 2015	129.2			129.2