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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2015
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 available to shareholders of common stock (excluding participating securities):

 
 
Three Months Ended
 
 
March 31,
 
 
2015
 
2014
 
 
(in millions, except per share data)
Numerator
 
 
 
 
Net income
 
$
53.2

 
$
33.6

    Less: Net income attributable to participating securities
 
(1.2
)
 
(0.6
)
Net income attributable to common shareholders - Basic
 
$
52.0

 
$
33.0

    Undistributed earnings reallocated to common shareholders under two step
    dilutive method
 
—

 
—

Net income attributable to common shareholders - Dilutive
 
$
52.0

 
$
33.0

 
 
 
 
 
Denominators
 
 

 
 

Basic common shares outstanding -
 
 

 
 

   Weighted-average shares outstanding
 
77.5

 
77.0

        Less: Participating securities
 
(1.7
)
 
(1.4
)
    Weighted-average common shares outstanding
 
75.8

 
75.6

 
 
 
 
 
Effect of dilutive securities -
 
 

 
 

   Dilutive stock-based compensation
 
0.3

 
0.1

 
 


 


Diluted shares outstanding -
 
 

 
 

   Adjusted weighted-average shares after assumed conversions
 
76.1

 
75.7

 
 
 

 
 

Basic EPS
 
$
0.69

 
$
0.44

 
 
 

 
 

Diluted EPS
 
$
0.68

 
$
0.44