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Earnings Per Share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in millions, except per share data).
 
Year Ended December 31
 
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
Net income
$
392.6

 
$
441.3

 
$
160.2

Less: distributed and undistributed earnings allocated to participating securities
(5.7
)
 
—

 
—

Net income attributable to common shareholders
$
386.9

 
$
441.3

 
$
160.2

Denominator:
 

 
 

 
 

Weighted average basic common shares outstanding
97.0

 
96.6

 
96.4

Effect of dilutive securities
0.1

 
0.9

 
1.1

Diluted common shares outstanding
97.1

 
97.5

 
97.5

Basic income per common share
$
3.99

 
$
4.57

 
$
1.66

Diluted income per common share
$
3.99

 
$
4.52

 
$
1.64



For the years ended December 31, 2014, 2013, and 2012, all outstanding options to purchase shares were included in the computation of diluted common shares outstanding. On June 29, 2014, all remaining options to purchase shares expired.