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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share Table
 
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