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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2014
Earnings (Loss) per Share (EPS) [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of our basic and diluted EPS:
 
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in millions, except per share data)
Numerator
 
 
 
 
 
 
 
 
Net income
 
$
52.2

 
$
25.8

 
$
85.8

 
$
33.1

 
 
 

 
 

 
 

 
 

Denominator
 
 

 
 

 
 

 
 

Basic shares outstanding -
 
 

 
 

 
 

 
 

   Weighted-average shares outstanding
 
77.4

 
76.8

 
77.2

 
76.5

 
 
 

 
 

 
 

 
 

Effect of dilutive securities
 
 

 
 

 
 

 
 

   Dilutive stock-based compensation
 
0.1

 
0.1

 
0.1

 
—

 
 


 


 


 


Diluted shares outstanding -
 
 

 
 

 
 

 
 

   Adjusted weighted-average shares after assumed conversions
 
77.5

 
76.9

 
77.3

 
76.5

 
 
 

 
 

 
 

 
 

Basic EPS
 
$
0.67

 
$
0.34

 
$
1.11

 
$
0.43

 
 
 

 
 

 
 

 
 

Diluted EPS
 
$
0.67

 
$
0.34

 
$
1.11

 
$
0.43