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Earnings Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share

4.

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

 

 

 

 

2017

 

 

 

2016

 

 

 

2015

 

Numerator:

 

 

 

 

 

 

 

 

 

 

 

 

Net income

 

$

668.6

 

 

$

449.6

 

 

$

436.8

 

Less: distributed and undistributed earnings allocated

   to participating securities

 

 

(5.6

)

 

 

(4.4

)

 

 

(5.2

)

Net income attributable to common stockholders

 

$

663.0

 

 

$

445.2

 

 

$

431.6

 

Denominator:

 

 

 

 

 

 

 

 

 

 

 

 

Weighted average common shares outstanding

 

 

93.5

 

 

 

93.5

 

 

 

96.6

 

Effect of dilutive securities

 

 

0.2

 

 

 

0.2

 

 

 

0.1

 

Diluted common shares outstanding

 

 

93.7

 

 

 

93.7

 

 

 

96.7

 

Basic income per common share

 

$

7.09

 

 

$

4.76

 

 

$

4.47

 

Diluted income per common share

 

$

7.07

 

 

$

4.75

 

 

$

4.47