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EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE

Basic and diluted net income per share are computed by dividing net income by the weighted average number of common shares outstanding.  Diluted net income per share reflects the dilutive effect of stock-based compensation.

 
 
 
Three Months Ended
March 31,
 
 
 
 
 
2013
 
2012
Computation of Income per Share
 
 
 
 
($ and shares in millions, except per share data)
Net income
 
 
 
 
$
40.5

 
$
38.7

Basic shares
 
 
 
 
80.2

 
80.1

Basic net income per share
 
 
 
 
$
0.50

 
$
0.48

Diluted shares:
 
 
 
 
 
 
 
Basic shares
 
 
 
 
80.2

 
80.1

Stock-based compensation
 
 
 
 
1.0

 
0.8

Diluted shares
 
 
 
 
81.2

 
80.9

Diluted net income per share
 
 
 
 
$
0.50

 
$
0.48


The computation of dilutive shares from stock-based compensation does not include 1.4 million shares and 0.8 million shares for the three months ended March 31, 2013 and 2012, respectively, as their effect would have been anti-dilutive.