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Net Income Per Share (Tables)
 9 Months Ended
Oct. 31, 2013
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 October 31,
 
Nine Months Ended October 31,
 
2013
 
2012
 
2013
 
2012
Numerator:
 
 
 
 
 
 
 
Net income
$
57.6

 
$
29.4

 
$
174.9

 
$
172.9

Denominator:
 
 
 
 
 
 
 
Denominator for basic net income per share—weighted average shares
223.1

 
225.5

 
223.4

 
227.1

Effect of dilutive securities
4.6

 
4.4

 
5.2

 
4.3

Denominator for dilutive net income per share
227.7

 
229.9

 
228.6

 
231.4

Basic net income per share
$
0.26

 
$
0.13

 
$
0.78

 
$
0.76

Diluted net income per share
$
0.25

 
$
0.13

 
$
0.77

 
$
0.75