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Earnings Per Share
 12 Months Ended
Dec. 31, 2015
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
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
Net income
$
436.8

 
$
392.6

 
$
441.3

Less: distributed and undistributed earnings allocated to participating securities
(5.2
)
 
(5.7
)
 
—

Net income attributable to common shareholders
$
431.6

 
$
386.9

 
$
441.3

Denominator:
 

 
 

 
 

Weighted average basic common shares outstanding
96.6

 
97.0

 
96.6

Effect of dilutive securities
0.1

 
0.1

 
0.9

Diluted common shares outstanding
96.7

 
97.1

 
97.5

Basic income per common share
$
4.47

 
$
3.99

 
$
4.57

Diluted income per common share
$
4.47

 
$
3.99

 
$
4.52



As of June 29, 2014, we had no remaining options to purchase shares. For the years ended 2014 and 2013, all outstanding options to purchase shares were included in the computation of diluted common shares outstanding.