CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($) shares in Millions, $ in Millions	Apr. 30, 2016	Jan. 31, 2016	Apr. 30, 2015
Allowance for doubtful accounts receivable, current	$ 11.6	$ 11.5	$ 10.0
Preferred Stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred Stock, shares authorized	2.0	2.0	2.0
Preferred Stock, shares issued	0.0	0.0	0.0
Preferred Stock, shares outstanding	0.0	0.0	0.0
Common Stock, par value	$ 0.01	$ 0.01	$ 0.01
Common Stock, shares authorized	240.0	240.0	240.0
Common Stock, shares issued	126.0	126.8	129.2
Common Stock, shares outstanding	126.0	126.8	129.2