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Earnings Per Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share
6.
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,

 

 

 

2021

 

 

2020

 

 

2019

 

Numerator:

 

 

 

 

 

 

 

 

 

Net income

 

$

841.1

 

 

$

461.0

 

 

$

696.4

 

Less: distributed and undistributed earnings allocated
   to participating securities

 

 

(6.4

)

 

 

(3.6

)

 

 

(5.2

)

Net income attributable to common stockholders

 

$

834.7

 

 

$

457.4

 

 

$

691.2

 

Denominator:

 

 

 

 

 

 

 

 

 

Weighted average common shares outstanding

 

 

94.1

 

 

 

94.1

 

 

 

93.8

 

Effect of dilutive securities

 

 

0.4

 

 

 

0.3

 

 

 

0.3

 

Diluted common shares outstanding

 

 

94.5

 

 

 

94.4

 

 

 

94.1

 

Basic income per common share

 

$

8.87

 

 

$

4.86

 

 

$

7.36

 

Diluted income per common share

 

$

8.83

 

 

$

4.84

 

 

$

7.34