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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Income Per Common 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):

 

 

 

Three Months Ended

 

 

 

March 31,

 

Numerator:

 

2019

 

 

2018

 

Net income

 

$

186.8

 

 

$

140.1

 

Less: distributed and undistributed earnings allocated to

   participating securities

 

 

(1.4

)

 

 

(1.1

)

Net income attributable to common shareholders

 

$

185.4

 

 

$

139.0

 

Denominator:

 

 

 

 

 

 

 

 

Weighted average basic common shares outstanding

 

 

93.7

 

 

 

93.6

 

Effect of dilutive securities

 

 

0.3

 

 

 

0.2

 

Weighted average diluted common shares outstanding

 

 

94.0

 

 

 

93.8

 

Basic income per common share

 

$

1.98

 

 

$

1.48

 

Diluted income per common share

 

$

1.97

 

 

$

1.48