Earnings Per Share of Common Stock (Tables)

12 Months Ended

Dec. 31, 2018

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 (losses) earnings per share computations for 2018, 2017 and 2016:

	Year Ended December 31,
	2018		2017		2016
	($ in millions, except share amounts)
Net earnings available to Alleghany stockholders	$	$39.5	$	$90.1	$	$456.9
Effect of dilutive securities		-		-		-
Income available to common stockholders for diluted earnings per share	$	$39.5	$	$90.1	$	$456.9
Weighted average common shares outstanding applicable to basic earnings per share		15,062,567		15,410,034		15,436,286
Effect of dilutive securities		-		-		6,363
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		15,062,567		15,410,034		15,442,649
Contingently issuable shares(1)		23,947		78,345		68,429

(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.