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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2015
 
2014
 
2015
 
2014
 
 
(in millions, except per share data)
Numerator
 
 
 
 
 
 
 
 
Net income
 
$
60.9

 
$
44.0

 
$
172.7

 
$
129.8

    Less: Net income attributable to participating securities
 
(1.4
)
 
(0.9
)
 
(4.0
)
 
(2.6
)
Net income attributable to common shareholders - Basic
 
$
59.5

 
$
43.1

 
$
168.7

 
$
127.2

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

 
—

 
—

 
—

Net income attributable to common shareholders - Dilutive
 
$
59.5

 
$
43.1

 
$
168.7

 
$
127.2

 
 
 
 
 
 
 
 
 
Denominators
 
 

 
 

 
 
 
 
Basic common shares outstanding -
 
 

 
 

 
 
 
 
   Weighted-average shares outstanding
 
77.8

 
77.4

 
77.7

 
77.2

        Less: Participating securities
 
(1.8
)
 
(1.7
)
 
(1.8
)
 
(1.5
)
    Weighted-average common shares outstanding
 
76.0

 
75.7

 
75.9

 
75.7

 
 
 
 
 
 
 
 
 
Effect of dilutive securities -
 
 

 
 

 
 
 
 
   Dilutive stock-based compensation
 
0.4

 
0.2

 
0.4

 
0.2

 
 


 


 
 
 
 
Diluted shares outstanding -
 
 

 
 

 
 
 
 
   Adjusted weighted-average shares after assumed conversions
 
76.4

 
75.9

 
76.3

 
75.9

 
 
 

 
 

 
 
 
 
Basic EPS
 
$
0.78

 
$
0.57

 
$
2.22

 
$
1.68

 
 
 

 
 

 
 
 
 
Diluted EPS
 
$
0.78

 
$
0.57

 
$
2.21

 
$
1.68