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NET INCOME PER SHARE (Tables)
6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Net Income Per Share
The following table presents the computation of basic and diluted net income per share for the three and six months ended June 30, 2014, and 2013 (in millions, except per share amounts):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Net income
$
104.0

 
$
159.1

 
$
148.3

 
$
348.0

Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding used in basic calculation
36.9

 
39.9

 
37.6

 
40.1

Add: Dilutive effect of potential common shares
0.7

 
0.9

 
0.7

 
1.0

Weighted-average shares used in computing diluted net income per share
37.6

 
40.8

 
38.3

 
41.1

Net income per share:
 
 
 
 
 
 
 
Basic
$
2.82

 
$
3.99

 
$
3.94

 
$
8.68

Diluted
$
2.77

 
$
3.90

 
$
3.87

 
$
8.47