Net Income Per Share (Tables)

6 Months Ended

Jul. 31, 2012

Earnings Per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income per share amounts:

	Three Months Ended July 31,				Six Months Ended July 31,
	2012		2011		2012		2011
Numerator:
Net income	$	64.6	$	71.2	$	143.5	$	140.5
Denominator:
Denominator for basic net income per share—weighted average shares	227.8		229.4		228.0		228.8
Effect of dilutive securities	4.3		7.2		5.1		8.1
Denominator for dilutive net income per share	232.1		236.6		233.1		236.9
Basic net income per share	$	0.28	$	0.31	0.63		0.61
Diluted net income per share	$	0.28	$	0.30	0.62		0.59