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NET INCOME PER SHARE (Tables)
3 Months Ended
Mar. 31, 2015
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 months ended March 31, 2015, and 2014 (in millions, except per share amounts):
 
Three Months Ended 
 March 31,
 
2015
 
2014
Numerator:
 
 
 
Net income
$
97.0

 
$
44.3

Denominator:
 
 
 
Weighted-average shares outstanding used in basic calculation
36.7

 
38.3

Add: dilutive effect of potential common shares
1.0

 
0.8

Weighted-average shares used in computing diluted net income per share
37.7

 
39.1

Net income per share:
 
 
 
Basic
$
2.64

 
$
1.16

Diluted
$
2.57

 
$
1.13