Earnings Per Share of Common Stock (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Reconciliation of Earnings and Share Data used in Basic and Diluted (Losses) Earnings per Share Computations

The following table presents a reconciliation of the earnings and share data used in the basic and diluted earnings per share computations for the three and nine months ended September 30, 2019 and 2018:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
	($ in millions, except share amounts)
Net earnings available to Alleghany stockholders	$	90.4	$	284.9	$	826.1	$	751.6
Effect of dilutive securities		-		-		-		-
Income available to common stockholders for diluted earnings per share	$	90.4	$	284.9	$	826.1	$	751.6
Weighted average common shares outstanding applicable to basic earnings per share		14,422,581		14,937,135		14,447,794		15,168,831
Effect of dilutive securities		-		-		10,956		4,849
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		14,422,581		14,937,135		14,458,750		15,173,680
Contingently issuable shares(1)						50,556		61,285

(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.