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Earnings Per Share of Common Stock
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share of Common Stock

11. Earnings Per Share of Common Stock

The following table presents a reconciliation of the earnings and share data used in the basic and diluted earnings per share computations for 2020, 2019 and 2018:

 

 

 

Year Ended December 31,

 

 

 

2020

 

 

2019

 

 

2018

 

 

 

($ in millions, except share amounts)

 

Net earnings available to Alleghany stockholders

 

$

101.8

 

 

$

857.8

 

 

$

39.5

 

Effect of dilutive securities

 

 

(1.2

)

 

 

—

 

 

 

—

 

Income available to common stockholders for diluted earnings per share

 

$

100.6

 

 

$

857.8

 

 

$

39.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted average common shares outstanding applicable to basic earnings per share

 

 

14,257,793

 

 

 

14,431,892

 

 

 

15,062,567

 

Effect of dilutive securities

 

 

25,825

 

 

 

11,584

 

 

 

—

 

Adjusted weighted average common shares outstanding applicable to diluted earnings per share

 

 

14,283,618

 

 

 

14,443,476

 

 

 

15,062,567

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contingently issuable shares(1)

 

 

34,148

 

 

 

48,468

 

 

 

23,947

 

 

(1)

Contingently issuable shares were potentially available in the periods presented, but were not included in the diluted earnings per share computations because the impact was anti-dilutive to the earnings per share calculation.