Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Stockholders Equity Note [Abstract]

Schedule of Common Stock Repurchases

The following table presents the shares of Common Stock that Alleghany repurchased in the three and nine months ended September 30, 2020 and 2019:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Shares repurchased		131,414		25,398		193,954		174,211
Cost of shares repurchased (in millions)	$	70.0	$	19.3	$	114.3	$	112.4
Average price per share repurchased	$	532.59	$	759.70	$	589.10	$	645.46

Reconciliation of Accumulated Other Comprehensive Income (Loss)

The following tables present a reconciliation of the changes during the nine months ended September 30, 2020 and 2019 in accumulated other comprehensive income (loss) attributable to Alleghany stockholders:

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2020	$	321.0		$	(121.8	)	$	(27.9	)	$	171.3
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		212.2			13.2			1.4			226.8
Reclassifications from accumulated other comprehensive income		(22.8	)		—			—			(22.8	)
Total		189.4			13.2			1.4			204.0
Balance as of September 30, 2020	$	510.4		$	(108.6	)	$	(26.5	)	$	375.3

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2019	$	(61.6	)	$	(124.7	)	$	(15.7	)	$	(202.0	)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		442.2			(8.1	)		1.4			435.5
Reclassifications from accumulated other comprehensive income		(10.2	)		—			—			(10.2	)
Total		432.0			(8.1	)		1.4			425.3
Balance as of September 30, 2019	$	370.4		$	(132.8	)	$	(14.3	)	$	223.3

Reclassifications of Accumulated Other Comprehensive Income (Loss)

The following table presents reclassifications out of accumulated other comprehensive income (loss) attributable to Alleghany stockholders during the three and nine months ended September 30, 2020 and 2019:

		Three Months Ended						Nine Months Ended
Accumulated Other		September 30,						September 30,
Comprehensive Income Component	Line in Consolidated Statement of Earnings	2020			2019			2020			2019
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(4.6	)	$	(9.8	)	$	(39.8	)	$	(26.6	)
	Change in allowance for credit losses on available for sale securities		(3.4	)		3.6			10.9			13.6
	Income taxes		1.7			1.3			6.1			2.8
Total reclassifications:	Net (earnings)	$	(6.3	)	$	(4.9	)	$	(22.8	)	$	(10.2	)

(1) For the three and nine months ended September 30, 2020, excludes: (i) the Concord Settlement Gain; and (ii) $1.6 million and $76.0 million, respectively, of impairment charge from a write-down of SORC oil field assets. For the nine months ended September 30, 2020, also excludes: (i) the Wilbert Remeasurement Gain; (ii) a $7.1 million realized loss as a result of an early redemption of debt; and (iii) a $5.0 million realized gain resulting from a reduction of certain contingent consideration liabilities.  See Note 3(e) of this Form 10-Q for additional information.