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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 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
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Computation of Income per Share
($ and shares in millions, except per share data)
Net income
$
69.7

 
$
28.7

 
$
153.9

 
$
115.0

Basic shares
79.8

 
80.1

 
80.1

 
80.1

Basic net income per share
$
0.87

 
$
0.36

 
$
1.92

 
$
1.44

Diluted shares:

 
 
 
 
 
 
Basic shares
79.8

 
80.1

 
80.1

 
80.1

Stock-based compensation
1.0

 
0.9

 
1.0

 
0.8

Diluted shares
80.8

 
81.0

 
81.1

 
80.9

Diluted net income per share
$
0.86

 
$
0.35

 
$
1.90

 
$
1.42


The computation of dilutive shares from stock-based compensation does not include 0.9 million shares and 1.0 million shares for the three months ended September 30, 2013 and 2012, respectively, and 1.4 million shares and 1.0 million shares for the nine months ended September 30, 2013 and 2012, respectively, as their effect would have been anti-dilutive.