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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Reconciliation of the Numerator and Denominator used in the Calculation of Basic and Diluted Earnings per Share
The following is a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per share available to common stockholders.
 
For the Years Ended December 31,
 
2012
 
2013
 
2014
Numerator
 
 
 
 
 
Net income (controlling interest)
$
174.0

 
$
360.5

 
$
452.1

Interest expense on convertible securities, net of taxes
—

 
10.5

 
15.2

Net income (controlling interest), as adjusted
$
174.0

 
$
371.0

 
$
467.3

Denominator
 

 
 

 
 

Average shares outstanding (basic)
51.7

 
53.1

 
55.0

Effect of dilutive instruments:
 

 
 

 
 

Stock options and other awards
1.3

 
1.3

 
1.2

Forward sale
—

 
0.3

 
0.0

Junior convertible securities
—

 
2.0

 
2.2

Average shares outstanding (diluted)
53.0

 
56.7

 
58.4
Diluted Earnings per Share Calculations Excluding the Anti-dilutive Effect of Shares
The diluted earnings per share calculations in the table above exclude the anti-dilutive effect of the following shares:
 
For the Years Ended December 31,
 
2012
 
2013
 
2014
Stock options and other awards
0.7

 
0.1

 
0.0

Senior convertible securities
3.6

 
2.1

 
—

Junior convertible securities
4.2

 
2.2

 
0.4

Forward equity sales
0.2

 
—

 
—