10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(MARK ONE)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR QUARTERLY PERIOD ENDED JUNE 30, 2011

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM             TO            

COMMISSION FILE NUMBER 1-9371

ALLEGHANY CORPORATION

EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER

DELAWARE

STATE OR OTHER JURISDICTION OF INCORPORATION OR ORGANIZATION

51-0283071

I.R.S. EMPLOYER IDENTIFICATION NO.

7 TIMES SQUARE TOWER, 17TH FLOOR, NY, NY 10036

ADDRESS OF PRINCIPAL EXECUTIVE OFFICES, INCLUDING ZIP CODE

212-752-1356

REGISTRANT’S TELEPHONE NUMBER, INCLUDING AREA CODE

NOT APPLICABLE

FORMER NAME, FORMER ADDRESS, AND FORMER FISCAL YEAR, IF CHANGED SINCE LAST REPORT

INDICATE BY CHECK MARK WHETHER THE REGISTRANT (1) HAS FILED ALL REPORTS REQUIRED TO BE FILED BY SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 DURING THE PRECEDING 12 MONTHS (OR FOR SUCH SHORTER PERIOD THAT THE REGISTRANT WAS REQUIRED TO FILE SUCH REPORTS), AND (2) HAS BEEN SUBJECT TO SUCH FILING REQUIREMENTS FOR THE PAST 90 DAYS.     YES   x     NO  ¨

INDICATE BY CHECK MARK WHETHER THE REGISTRANT HAS SUBMITTED ELECTRONICALLY AND POSTED ON ITS CORPORATE WEB SITE, IF ANY, EVERY INTERACTIVE DATA FILE REQUIRED TO BE SUBMITTED AND POSTED PURSUANT TO RULE 405 OF REGULATION S-T (SECTION 232.405 OF THIS CHAPTER) DURING THE PRECEDING 12 MONTHS (OR SUCH SHORTER PERIOD THAT THE REGISTRANT WAS REQUIRED TO SUBMIT AND POST SUCH FILES).     YES   x     NO  ¨

INDICATE BY CHECK MARK WHETHER THE REGISTRANT IS A LARGE ACCELERATED FILER, AN ACCELERATED FILER, OR A NON-ACCELERATED FILER. SEE DEFINITION OF ACCELERATED FILER AND LARGE ACCELERATED FILER IN RULE 12b-2 OF THE EXCHANGE ACT. (CHECK ONE):

LARGE ACCELERATED FILER	x	ACCELERATED FILER	¨
NON-ACCELERATED FILER	¨  (DO NOT CHECK IF A       SMALLER REPORTING COMPANY)	SMALLER REPORTING COMPANY	¨

INDICATE BY CHECK MARK WHETHER THE REGISTRANT IS A SHELL COMPANY (AS DEFINED IN RULE 12B-2 OF THE EXCHANGE ACT).     YES   ¨     NO   x

INDICATE THE NUMBER OF SHARES OUTSTANDING OF EACH OF THE ISSUER’S CLASSES OF COMMON STOCK, AS OF THE LAST PRACTICABLE DATE.

8,862,012 SHARES AS OF AUGUST 2, 2011

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements.

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Balance Sheets

	June 30,			December 31,
	2011			2010
	(in thousands, except share amounts)
	(unaudited)
Assets
Investments
Available-for-sale securities at fair value:
Equity securities (cost: 2011 – $1,406,542; 2010 – $1,310,009)	$	1,642,108		$	1,500,686
Debt securities (amortized cost: 2011 – $2,706,761; 2010 – $2,778,117)		2,795,231			2,832,411
Short-term investments		262,445			264,811
		4,699,784			4,597,908
Other invested assets		198,878			207,294
Total investments		4,898,662			4,805,202
Cash		85,484			76,741
Premium balances receivable		195,985			128,075
Reinsurance recoverables		872,589			873,295
Ceded unearned premium reserves		162,773			144,065
Deferred acquisition costs		72,125			67,692
Property and equipment at cost, net of accumulated depreciation and amortization		20,269			19,504
Goodwill and other intangibles, net of amortization		140,635			142,312
Current taxes receivable		12,529			—
Net deferred tax assets		37,196			77,147
Other assets		117,620			97,666
	$	6,615,867		$	6,431,699
Liabilities and Stockholders’ Equity
Loss and loss adjustment expenses	$	2,324,386		$	2,328,742
Unearned premiums		588,848			523,927
Senior Notes		298,979			298,923
Reinsurance payable		67,241			41,500
Current taxes payable		—			3,220
Other liabilities		306,964			326,519
Total liabilities		3,586,418			3,522,831
Common stock (shares authorized: 2011 and 2010 – 22,000,000; issued and outstanding 2011 – 9,117,787; 2010 – 9,300,448)		9,117			9,118
Contributed capital		937,057			928,816
Accumulated other comprehensive income		218,149			170,262
Treasury stock, at cost (2011 – 232,914 shares; 2010 – 351,532 shares)		(68,271	)		(99,686	)
Retained earnings		1,933,397			1,900,358
Total stockholders’ equity		3,029,449			2,908,868
	$	6,615,867		$	6,431,699

See accompanying Notes to Unaudited Consolidated Financial Statements.

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Earnings and Comprehensive Income

(unaudited)

	Three Months Ended June 30,
	2011			2010
	(in thousands, except per share amounts)
Revenues
Net premiums earned	$	183,878		$	188,809
Net investment income		28,545			32,694
Net realized capital gains		6,490			33,308
Other than temporary impairment losses		—			(5,703	)
Other income		248			1,501
Total revenues		219,161			250,609
Costs and expenses
Loss and loss adjustment expenses		122,619			83,027
Commissions, brokerage and other underwriting expenses		64,132			64,773
Other operating expenses		8,673			8,082
Corporate administration		5,002			6,324
Interest expense		4,268			216
Total costs and expenses		204,694			162,422
Earnings before income taxes		14,467			88,187
Income taxes		(615	)		21,916
Net earnings	$	15,082		$	66,271
Other comprehensive income
Change in unrealized gains (losses), net of deferred taxes	$	(24,428	)	$	(57,401	)
Less: reclassification for net realized capital gains and other than temporary impairment losses, net of taxes		(4,218	)		(17,943	)
Other		(50	)		50
Comprehensive income	$	(13,614	)	$	(9,023	)
Basic earnings per share*	$	1.69		$	7.26
Diluted earnings per share*	$	1.68		$	7.24

* Amounts reflect subsequent common stock dividends.

See accompanying Notes to Unaudited Consolidated Financial Statements.

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ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Earnings and Comprehensive Income

(unaudited)

	Six Months Ended June 30,
	2011			2010
	(in thousands, except per share amounts)
Revenues
Net premiums earned	$	364,858		$	383,509
Net investment income		60,124			64,123
Net realized capital gains		41,182			59,775
Other than temporary impairment losses		—			(6,780	)
Other income		1,133			1,634
Total revenues		467,297			502,261
Costs and expenses
Loss and loss adjustment expenses		193,641			179,654
Commissions, brokerage and other underwriting expenses		130,660			131,129
Other operating expenses		18,919			16,933
Corporate administration		11,381			11,558
Interest expense		8,720			435
Total costs and expenses		363,321			339,709
Earnings before income taxes		103,976			162,552
Income taxes		17,554			38,112
Net earnings	$	86,422		$	124,440
Other comprehensive income
Change in unrealized gains (losses), net of deferred taxes	$	74,834		$	(27,583	)
Less: reclassification for net realized capital gains and other than temporary impairment losses, net of taxes		(26,768	)		(34,447	)
Other		(179	)		99
Comprehensive income	$	134,309		$	62,509
Basic earnings per share*	$	9.69		$	13.58
Diluted earnings per share*	$	9.66		$	13.50

* Amounts reflect subsequent common stock dividends.

See accompanying Notes to Unaudited Consolidated Financial Statements.

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ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Cash Flows

(unaudited)

	Six Months Ended June 30,
	2011			2010
	(in thousands)
Cash flows from operating activities
Net earnings	$	86,422		$	124,440
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization		13,445			18,045
Net realized capital (gains) losses		(41,182	)		(59,775	)
Other than temporary impairment losses		—			6,780
(Increase) decrease in other assets		9,227			6,496
(Increase) decrease in reinsurance receivable, net of reinsurance payable		26,447			46,870
(Increase) decrease in premium balances receivable		(67,910	)		(37,109	)
(Increase) decrease in ceded unearned premium reserves		(18,708	)		(7,319	)
(Increase) decrease in deferred acquisition costs		(4,433	)		(1,382	)
Increase (decrease) in other liabilities and current taxes		(33,928	)		(28,996	)
Increase (decrease) in unearned premiums		64,921			22,703
Increase (decrease) in loss and loss adjustment expenses		(4,356	)		(102,047	)
Net adjustments		(56,477	)		(135,734	)
Net cash (used in) provided by operating activities		29,945			(11,294	)
Cash flows from investing activities
Purchase of investments		(694,810	)		(1,050,830	)
Sales of investments		541,941			1,078,492
Maturities of investments		154,709			184,185
Purchases of property and equipment		(4,582	)		(3,550	)
Net change in short-term investments		2,386			(90,934	)
Acquisition of equity method investments		—			(5,000	)
Other, net		(457	)		9,759
Net cash (used in) provided by investing activities		(813	)		122,122
Cash flows from financing activities
Treasury stock acquisitions		(21,277	)		(59,817	)
Tax benefit on stock based compensation		645			513
Other, net		243			132
Net cash (used in) provided by financing activities		(20,389	)		(59,172	)
Net cash increase (decrease) in cash		8,743			51,656
Cash at beginning of period		76,741			32,526
Cash at end of period	$	85,484		$	84,182
Supplemental disclosures of cash flow information
Cash paid during the period for:
Interest	$	8,203		$	—
Income taxes paid (refunds received)	$	20,724		$	46,204

See accompanying Notes to Unaudited Consolidated Financial Statements.

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ALLEGHANY CORPORATION AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

1. Principles of Financial Statement Presentation

This report should be read in conjunction with the Annual Report on Form 10-K for the year ended December 31, 2010 (the “2010 10-K”) and the Quarterly Report on Form 10-Q for the quarter ended March 31, 2011 of Alleghany Corporation (“Alleghany”).

Alleghany, a Delaware corporation, which together with its subsidiaries is referred to as “Alleghany” unless the context otherwise requires, is engaged in the property and casualty and surety insurance business through its wholly-owned subsidiary Alleghany Insurance Holdings LLC (“AIHL”). AIHL’s insurance business is conducted through its wholly-owned subsidiaries RSUI Group, Inc. (“RSUI”), Capitol Transamerica Corporation and Platte River Insurance Company (collectively “CATA”), and Pacific Compensation Corporation (“PCC”). AIHL Re LLC (“AIHL Re”), a captive reinsurance subsidiary of AIHL, has in the past provided reinsurance to Alleghany operating units and affiliates. Alleghany’s equity investments, including those held by AIHL’s insurance operating units, are managed primarily by Alleghany Capital Partners LLC, an indirect, wholly-owned subsidiary of Alleghany. Alleghany also owns and manages properties in the Sacramento, California region through its subsidiary Alleghany Properties Holdings LLC (“Alleghany Properties”). In addition, Alleghany owns approximately 33 percent of the outstanding shares of common stock of Homesite Group Incorporated (“Homesite”), a national, full-service, mono-line provider of homeowners insurance, and approximately 38 percent of ORX Exploration, Inc. (“ORX”), a regional oil and gas exploration and production company. Alleghany also makes strategic investments in operating companies and conducts other activities at the parent level.

The financial statements contained in this Quarterly Report on Form 10-Q are unaudited, but reflect all adjustments which, in the opinion of management, are necessary to a fair statement of results of the interim periods covered thereby. All adjustments are of a normal and recurring nature except as described herein.

The accompanying unaudited consolidated financial statements include the results of Alleghany and its wholly-owned and majority-owned subsidiaries, and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). All significant inter-company balances and transactions have been eliminated in consolidation.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those reported results to the extent that those estimates and assumptions prove to be inaccurate.

Certain prior year amounts have been reclassified to conform to the 2011 presentation.

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2. Recent Accounting Standards

Recently Adopted

In July 2010, the Financial Accounting Standards Board (“FASB”) issued guidance that provides for additional financial statement disclosure regarding financing receivables, including the credit quality and allowance for credit losses associated with such assets. This guidance is generally effective for interim and annual periods beginning after December 15, 2010, with certain disclosures effective for interim and annual periods ending on or after December 31, 2010. Alleghany fully adopted this guidance in the 2011 first quarter, and the implementation did not have any impact on its results of operations and financial condition.

Future Application of Accounting Standards

In June 2011, the FASB issued guidance on the presentation of comprehensive income. This guidance increases the prominence of other comprehensive income in the financial statements and eliminates the current option to report other comprehensive income and its components in the statement of changes in equity, and does not change the items that must be reported in other comprehensive income. This guidance is generally effective for interim and annual periods beginning after December 15, 2011. Alleghany will adopt this guidance in the 2012 first quarter, and Alleghany does not currently believe that the implementation will have an impact on its results of operations and financial condition.

In May 2011, FASB issued guidance that addresses requirements for measuring fair value. Among other things, the guidance clarifies that the “highest and best use” valuation premise applies only to non-financial assets, and that premiums or discounts should be applied to valuations of an individual asset or liability only when market participants would do so. The guidance also permits measurement of fair value of financial instruments (that are carried at fair value) based on an entity’s net exposure to a particular market or credit risk on a net basis if there is evidence that the entity manages its financial instruments in this way. The guidance provides for additional financial statement disclosure regarding fair value measurements, including disclosure involving transfers between categories within the fair value hierarchy, and quantitative and qualitative information about fair value measurements that involve a significant degree of judgment. This guidance is effective for interim and annual periods ending after December 15, 2011. Alleghany will adopt this guidance in the first quarter of 2012, and Alleghany does not believe the implementation will have a material impact on its results of operations and financial condition.

In October 2010, the FASB issued guidance that provides additional clarification for costs associated with acquiring or renewing insurance contracts. This guidance states that only incremental, direct costs associated with the successful acquisition of a new or renewal insurance contract may be capitalized as deferred acquisition costs. Furthermore, such costs: (i) must be essential to the contract transaction; (ii) would not have been incurred had the contract transaction not occurred; and (iii) must be related directly to the acquisition activities involving underwriting, policy issuance and processing, medical and inspection, and sales force contract selling. Advertising costs should be included in deferred acquisition costs only if the capitalization criteria in separate “direct-response” advertising guidance within GAAP are met. All other acquisition-related costs and other expenses should be charged to expense as incurred. This guidance is effective for interim and annual periods beginning after December 15, 2011, with early adoption permitted (but only at the beginning of an entity’s annual reporting period). Alleghany will adopt this guidance in the 2012 first quarter, and Alleghany does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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3. Earnings Per Share of Common Stock

The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2011 and 2010 (in millions, except share amounts):

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Net earnings	$	15.1		$	66.3		$	86.4		$	124.4
Effect of dilutive securities		(0.1	)		(0.1	)		(0.2	)		(0.5	)
Income available to common stockholders for diluted earnings per share	$	15.0		$	66.2		$	86.2		$	123.9
Weighted average shares outstanding applicable to basic earnings per share		8,916,620			9,124,187			8,921,950			9,164,443
Effect of dilutive securities		5,352			9,788			5,168			9,489
Adjusted weighted average shares outstanding applicable to diluted earnings per share		8,921,972			9,133,975			8,927,118			9,173,932

Contingently issuable shares of 42,429 and 40,756 were potentially available during the first six months of 2011 and 2010, respectively, but were not included in the computations of diluted earnings per share because the impact was anti-dilutive to the earnings per share calculation.

Earnings per share by quarter may not equal the amount for the full year due to the timing of treasury stock purchases and rounding.

4. Commitments and Contingencies

(a) Leases

Alleghany leases certain facilities, furniture and equipment under long-term lease agreements.

(b) Litigation

Alleghany’s subsidiaries are parties to pending litigation and claims in connection with the ordinary course of their businesses. Each such subsidiary makes provisions for estimated losses to be incurred in such litigation and claims, including legal costs. In the opinion of management, such provisions were adequate as of June 30, 2011.

(c) Asbestos and Environmental Impairment Exposure

AIHL’s reserves for unpaid loss and loss adjustment expenses include $13.9 million of gross reserves and $13.8 million of net reserves as of June 30, 2011, and $14.1 million of gross reserves and $14.0 million of net reserves as of December 31, 2010, for asbestos and environmental impairment claims that arose from reinsurance assumed by a subsidiary of CATA between 1969 and 1976. This subsidiary exited such business in 1976. Additional information concerning CATA’s asbestos and environmental exposure can be found in Note 13 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

(d) Indemnification Obligations

On July 14, 2005 (the “Closing Date”), Alleghany completed the sale of its world-wide industrial minerals business, World Minerals, Inc. (“World Minerals”), to Imerys USA, Inc. (the “Purchaser”), a wholly-owned subsidiary of Imerys, S.A., pursuant to a Stock Purchase Agreement, dated as of May 19, 2005, by and among the Purchaser, Imerys, S.A. and Alleghany (the “Stock Purchase Agreement”). Pursuant to the Stock Purchase Agreement, Alleghany undertook certain indemnification obligations, including a general indemnification for breaches of representations and warranties set forth in the Stock Purchase Agreement (the “Contract Indemnification”), and a special indemnification (the “Products Liability Indemnification”) related to products liability claims arising from events that occurred during pre-closing periods, including the period of Alleghany ownership (the “Alleghany Period”). Under the terms of the Stock Purchase Agreement, with respect to products liability claims arising in respect of events occurring during the period prior to Alleghany’s acquisition of World Minerals, Alleghany will provide indemnification at a rate of 100 percent for the first $100.0 million of losses arising from such claims, and at a rate of 50 percent for the next $100.0 million of such losses, so that Alleghany’s maximum indemnification obligation in respect of products liability claims relating to such period of time is $150.0 million. This indemnification obligation will expire on July 31, 2016. With respect to the Alleghany Period, based on its historical

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experience and other analyses, in July 2005, Alleghany established a $0.6 million reserve in connection with the Products Liability Indemnification for the Alleghany Period. Such reserve was approximately $0.2 million at both June 30, 2011 and December 31, 2010. The Stock Purchase Agreement provides that Alleghany has no responsibility for products liability claims arising in respect of events occurring after the Closing Date, and that any products liability claims involving both pre-closing and post-closing periods will be apportioned on an equitable basis.

Additional information concerning the Products Liability Indemnification and Contract Indemnification can be found in Note 13 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

(e) Equity Holdings Concentration

As of June 30, 2011 and December 31, 2010, Alleghany had a concentration of market risk in its available-for-sale equity securities portfolio with respect to certain energy sector businesses of $1,024.9 million and $1,004.8 million, respectively. Of the $1,024.9 million, $651.0 million represents Alleghany’s ownership of common stock of Exxon Mobil Corporation.

5. Segments of Business

Information related to Alleghany’s reportable segment is shown in the table below. Property and casualty and surety insurance operations are conducted by AIHL through its insurance operating units RSUI, CATA and PCC. In addition, AIHL Re is a wholly-owned subsidiary of AIHL that has in the past provided reinsurance to Alleghany’s insurance operating units and affiliates.

Alleghany’s reportable segment is reported in a manner consistent with the way management evaluates the businesses. As such, insurance underwriting activities are evaluated separately from investment activities. Net realized capital gains and other-than-temporary impairment losses are not considered relevant in evaluating investment performance on an annual basis. Segment accounting policies are described in Note 1 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

The primary components of “corporate activities” are Alleghany Properties, Alleghany’s investments in Homesite and ORX and strategic investments and other activities at the parent level.

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	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Revenues:
AIHL insurance group:
Net premiums earned
RSUI	$	144.4		$	146.3		$	286.0		$	296.6
CATA		37.9			41.5			77.1			82.1
PCC		1.6			1.0			1.7			4.9
		183.9			188.8			364.8			383.6
Net investment income		31.0			33.0			61.2			66.3
Net realized capital gains		6.5			32.7			41.2			55.5
Other than temporary impairment losses (1)		—			(5.7	)		—			(6.8	)
Other income		0.1			0.2			0.3			0.3
Total insurance group		221.5			249.0			467.5			498.9
Corporate activities:
Net investment income (2)		(2.4	)		(0.3	)		(1.0	)		(2.2	)
Net realized capital gains		—			0.6			—			4.3
Other than temporary impairment losses		—			—			—			—
Other income		0.1			1.3			0.8			1.3
Total	$	219.2		$	250.6		$	467.3		$	502.3
Earnings before income taxes:
AIHL insurance group:
Underwriting profit (loss) (3)
RSUI	$	19.5		$	43.8		$	68.5		$	80.6
CATA		(1.7	)		2.7			(1.0	)		3.0
PCC		(20.6	)		(5.5	)		(26.9	)		(10.9	)
		(2.8	)		41.0			40.6			72.7
Net investment income		31.0			33.0			61.2			66.3
Net realized capital gains		6.5			32.7			41.2			55.5
Other than temporary impairment losses (1)		—			(5.7	)		—			(6.8	)
Other income, less other expenses		(7.2	)		(7.5	)		(16.9	)		(15.9	)
Total insurance group		27.5			93.5			126.1			171.8
Corporate activities:
Net investment income (2)		(2.4	)		(0.3	)		(1.0	)		(2.2	)
Net realized capital gains		—			0.6			—			4.3
Other than temporary impairment losses		—			—			—			—
Other income		0.1			1.3			0.8			1.3
Corporate administration and other expenses		6.4			6.8			13.2			12.5
Interest expense		4.3			0.1			8.7			0.1
Total	$	14.5		$	88.2		$	104.0		$	162.6

(1) Reflects impairment charges for unrealized losses related to AIHL’s investment portfolio that were deemed to be other-than-temporary. See Note 7(c).

(2) Includes $7.1 million and $1.6 million of Alleghany’s equity share of losses in Homesite for the six months ended June 30, 2011 and 2010, respectively, and $2.2 million and $2.8 million of Alleghany’s equity share of losses in ORX for the six months ended June 30, 2011 and 2010, respectively.

(3) Represents net premiums earned less loss and loss adjustment expenses and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, net realized capital gains, other-than-temporary impairment losses, other income or other expenses. Commissions, brokerage and other underwriting expenses represent commission and brokerage expenses and that portion of salaries, administration and other operating expenses attributable primarily to underwriting activities, whereas the remainder constitutes other expenses.

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6. Reinsurance

As discussed in the 2010 10-K, RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program (which covers catastrophe risks including, among others, windstorms and earthquakes) and per risk reinsurance program run on an annual basis from May 1 to the following April 30 and thus expired on April 30, 2011. RSUI renewed all of its catastrophe reinsurance program for the 2011-2012 period, and the new reinsurance program is similar to the expired program. The new reinsurance program provides coverage in two layers for $400.0 million of losses in excess of a $100.0 million net retention after application of the surplus share treaties, facultative reinsurance and per risk covers. The first layer provides coverage for $100.0 million of losses, before a 47.0 percent co-participation by RSUI (compared with a 33.0 percent co-participation under the expired program), in excess of the $100.0 million net retention, and the second layer provides coverage for $300.0 million of losses, before a 5.0 percent co-participation by RSUI, in excess of $200.0 million. In addition, RSUI’s property per risk reinsurance program for the 2011-2012 period provides RSUI with coverage for $90.0 million of losses, before a 10.0 percent co-participation by RSUI, in excess of a $10.0 million net retention per risk after application of the surplus share treaties and facultative reinsurance.

As discussed in Note 5(a) to the Notes to Consolidated Financial Statements set forth in Item 8 of the 2010 10-K, RSUI reinsures its other lines of business through quota share treaties, except for professional liability, binding authority and (effective April 15, 2011) the general liability lines where RSUI retains all of such business. RSUI’s quota share reinsurance treaty for umbrella/excess lines of business renewed on June 1, 2011 on the same terms as the expiring treaty, providing coverage for policies with limits up to $30.0 million, with RSUI ceding 35.0 percent of the premium and loss for policies with limits up to $15.0 million and ceding 67.5 percent of the premium and loss for policies with limits in excess of $15.0 million up to $30.0 million. RSUI’s directors and officers liability line quota share reinsurance treaty renewed on July 1, 2011 on the same terms as the expiring treaty, providing coverage for policies with limits up to $20.0 million, with RSUI ceding 35.0 percent of the premium and loss for policies with limits up to $10.0 million and ceding 60.0 percent of the premium and loss for policies with limits in excess of $10.0 million up to $20.0 million.

7. Investments

(a) Fair Value

The estimated carrying values and fair values of Alleghany’s consolidated financial instruments as of June 30, 2011 and December 31, 2010 were as follows (in millions):

	June 30, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets
Investments (excluding equity method investments)*	$	4,726.9	$	4,726.9	$	4,622.7	$	4,622.7
Liabilities
Senior Notes**	$	299.0	$	308.9	$	298.9	$	291.8

* This table includes available-for-sale investments (securities as well as partnership investments carried at fair value that are included in other invested assets). This table excludes investments accounted for using the equity method (Homesite, ORX and other investments) and certain loans receivable that are carried at cost, all of which are included in other invested assets. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is discussed below.

** See Note 7 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. In addition, GAAP has a three-tiered hierarchy for inputs used in management’s determination of fair value of financial instruments that emphasizes the use of observable inputs over the use of unobservable inputs by requiring that the observable inputs be used when available. Observable inputs are market participant assumptions based on market data obtained from sources independent of the reporting entity. Unobservable inputs are the reporting entity’s own assumptions about market participant assumptions based on the best information available under the circumstances. In assessing the appropriateness of using observable inputs in making its fair value determinations, Alleghany considers whether the market for a particular security is “active” or not based on all the relevant facts and circumstances. For example, Alleghany may consider a market to be inactive if there are relatively few recent transactions or if there is a significant decrease in market volume. Furthermore, Alleghany considers whether observable transactions are “orderly” or not.

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Alleghany does not consider a transaction to be orderly if there is evidence of a forced liquidation or other distressed condition, and as such, little or no weight is given to that transaction as an indicator of fair value.

The hierarchy is broken down into three levels based on the reliability of inputs as follows:

• “Level 1” — Valuations are based on unadjusted quoted prices in active markets for identical, unrestricted assets. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these assets does not involve any meaningful degree of judgment. An active market is defined as a market where transactions for the financial instrument occur with sufficient frequency and volume to provide pricing information on an ongoing basis. Alleghany’s Level 1 assets generally include publicly traded common stocks and debt securities issued directly by the U.S. Government, where Alleghany’s valuations are based on quoted market prices.

• “Level 2” — Valuations are based on quoted market prices where such markets are not deemed to be sufficiently “active.” In such circumstances, additional valuation metrics will be used which involve direct or indirect observable market inputs. Alleghany’s Level 2 assets generally include preferred stocks and debt securities other than debt issued directly by the U.S. Government. Alleghany’s Level 2 liabilities include the Senior Notes. Substantially all of the determinations of value in this category are based on a single quote from third-party dealers and pricing services. As Alleghany generally does not make any adjustments thereto, such quote typically constitutes the sole input in its determination of the fair value of these types of securities. In developing a quote, such third-parties will use the terms of the security and market-based inputs. Terms of the security include coupon, maturity date, and any special provisions that may, for example, enable the investor, at its election, to redeem the security prior to its scheduled maturity date. Market-based inputs include the level of interest rates applicable to comparable securities in the market place and current credit rating(s) of the security. Such quotes are generally non-binding.

• “Level 3” — Valuations are based on inputs that are unobservable and significant to the overall fair value measurement. Valuation under Level 3 generally involves a significant degree of judgment on the part of Alleghany. Alleghany’s Level 3 assets are primarily limited to partnership investments. Net asset value quotes from the third-party general partner of the entity in which such investment is held, which will often be based on unobservable market inputs, constitute the primary input in Alleghany’s determination of the fair value of such assets.

Alleghany validates the reasonableness of its fair value determinations for Level 2 securities by testing the methodology of the relevant third-party dealer or pricing service that provides the quotes upon which the fair value determinations are made. Alleghany tests the methodology by comparing such quotes with prices from executed market trades when such trades occur. Alleghany discusses with the relevant third-party dealer or pricing service any identified material discrepancy between the quote derived from its methodology and the executed market trade in order to resolve the discrepancy. Alleghany uses the quote from the third-party dealer or pricing service unless Alleghany determines that the methodology used to produce such quote is not in compliance with GAAP. In addition to such procedures, Alleghany also compares the aggregate amount of the fair value for such Level 2 securities with the aggregate fair value provided by a third-party financial institution. Furthermore, Alleghany reviews the reasonableness of its classification of securities within the three-tiered hierarchy to ensure that the classification is consistent with GAAP.

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The estimated fair values of Alleghany’s financial instruments as of June 30, 2011 and December 31, 2010 allocated among the three levels set forth above were as follows (in millions):

	Level 1		Level 2		Level 3		Total
As of June 30, 2011
Equity securities:
Common stock(1)	$	1,642.1	$	—	$	—	$	1,642.1
Preferred stock		—		—		—		—
Debt securities:
U.S. Government obligations		271.9		30.5		—		302.4
Mortgage and asset-backed securities(2)		—		1,006.3		—		1,006.3
States, municipalities and political subdivision bonds		—		1,000.6		—		1,000.6
Foreign bonds		—		90.3		—		90.3
Corporate bonds and other		—		395.6		—		395.6
		271.9		2,523.3		—		2,795.2
Short-term investments		87.4		175.0		—		262.4
Other invested assets(3)		—		—		27.2		27.2
Investments (excluding equity method investments)	$	2,001.4	$	2,698.3	$	27.2	$	4,726.9
Senior Notes	$	—	$	308.9	$	—	$	308.9
As of December 31, 2010
Equity securities:
Common stock(1)	$	1,500.7	$	—	$	—	$	1,500.7
Preferred stock		—		—		—		—
Debt securities:
U.S. Government obligations		307.3		30.5		—		337.8
Mortgage and asset-backed securities(2)		—		866.5		—		866.5
States, municipalities and political subdivision bonds		—		1,068.5		—		1,068.5
Foreign bonds		—		114.2		—		114.2
Corporate bonds and other		—		445.4		—		445.4
		307.3		2,525.1		—		2,832.4
Short-term investments		86.4		178.4		—		264.8
Other invested assets(3)		—		—		24.8		24.8
Investments (excluding equity method investments)	$	1,894.4	$	2,703.5	$	24.8	$	4,622.7
Senior Notes	$	—	$	291.8	$	—	$	291.8

(1) Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

(2) Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to residential mortgage-backed securities (“RMBS”), $190.5 million related to commercial mortgage-backed securities (“CMBS”) and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

(3) Level 3 securities consist of partnership investments. The carrying value of partnership investments of $27.2 million increased by $2.4 million from the December 31, 2010 carrying value of $24.8 million, due primarily to an increase in estimated fair value during the period.

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(b) Available-For-Sale Securities

Available-for-sale securities as of June 30, 2011 and December 31, 2010 are summarized as follows (in millions):

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
As of June 30, 2011
Equity securities:
Common stock(1)	$	1,406.5	$	252.1	$	(16.5	)	$	1,642.1
Preferred stock		—		—		—			—
Debt securities:
U.S. Government obligations		298.4		4.4		(0.4	)		302.4
Mortgage and asset-backed securities(2)		971.4		38.8		(3.9	)		1,006.3
States, municipalities and political subdivision bonds		965.9		37.8		(3.1	)		1,000.6
Foreign bonds		88.5		2.5		(0.7	)		90.3
Corporate bonds and other		382.6		14.1		(1.1	)		395.6
		2,706.8		97.6		(9.2	)		2,795.2
Short-term investments		262.4		—		—			262.4
	$	4,375.7	$	349.7	$	(25.7	)	$	4,699.7
Industry Segment
AIHL insurance group	$	3,818.5	$	249.0	$	(25.7	)	$	4,041.8
Corporate activities		557.2		100.7		—			657.9
	$	4,375.7	$	349.7	$	(25.7	)	$	4,699.7

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
As of December 31, 2010
Equity securities:
Common stock(1)	$	1,310.0	$	196.3	$	(5.6	)	$	1,500.7
Preferred stock		—		—		—			—
Debt securities:
U.S. Government obligations		334.4		4.6		(1.2	)		337.8
Mortgage and asset-backed securities(2)		841.0		31.8		(6.3	)		866.5
States, municipalities and political subdivision bonds		1,058.1		25.4		(15.0	)		1,068.5
Foreign bonds		112.7		2.4		(0.9	)		114.2
Corporate bonds and other		431.9		14.9		(1.4	)		445.4
		2,778.1		79.1		(24.8	)		2,832.4
Short-term investments		264.8		—		—			264.8
	$	4,352.9	$	275.4	$	(30.4	)	$	4,597.9
Industry Segment
AIHL insurance group	$	3,760.3	$	232.7	$	(30.4	)	$	3,962.6
Corporate activities		592.6		42.7		—			635.3
	$	4,352.9	$	275.4	$	(30.4	)	$	4,597.9

(1) Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

(2) Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to RMBS, $190.5 million related to CMBS and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

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The amortized cost and estimated fair value of debt securities as of June 30, 2011 by contractual maturity are shown below (in millions). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
Short-term investments due in one year or less	$	262.4	$	262.4
Mortgage and asset-backed securities		971.4		1,006.3
Debt securities
One year or less		241.1		244.2
Over one through five years		540.7		561.6
Over five through ten years		569.7		594.0
Over ten years		383.9		389.1
Equity securities		1,406.5		1,642.1
	$	4,375.7	$	4,699.7

The proceeds from sales of available-for-sale securities were $0.5 billion and $1.1 billion for the six months ended June 30, 2011 and 2010, respectively. The amounts of gross realized capital gains and gross realized capital losses of available-for-sale securities (primarily, equity securities) for the six months ended June 30, 2011 and June 30, 2010 were:

	Six Months Ended June 30,
	2011			2010
	(in millions)
Gross realized gains	$	48.5		$	64.1
Gross realized losses		(7.3	)		(4.3	)
Net realized gains	$	41.2		$	59.8

The gross loss amounts exclude other-than-temporary impairment losses, as discussed below. Realized gains and losses on investments are determined in accordance with the specific identification method.

(c) Other-Than-Temporary Impairment Losses

Alleghany holds it equity and debt securities as available for sale, and as such, these securities are recorded at fair value. Alleghany continually monitors the difference between cost and the estimated fair value of its investments, which involves uncertainty as to whether declines in value are temporary in nature. If a decline in the value of a particular investment is deemed temporary, Alleghany records the decline as an unrealized loss in stockholders’ equity. If the decline is deemed to be other than temporary, Alleghany writes it down to the carrying value of the investment and records an other-than-temporary impairment loss on its statement of earnings, regardless of whether Alleghany continues to hold the applicable security. In addition, under GAAP, any portion of such decline that relates to debt securities that is believed to arise from factors other than credit is recorded as a component of other comprehensive income.

Management’s assessment of a decline in value initially involves an evaluation of all securities that are in an unrealized loss position, regardless of the duration or severity of the loss, as of the applicable balance sheet date. Such initial review consists primarily of assessing whether:

(i) there has been a negative news event with respect to the issuer of any such security (irrespective of the duration or severity of its loss) that could indicate the existence of an other-than-temporary impairment;

(ii) Alleghany has the ability and intent to hold an equity security for a period of time sufficient to allow for an anticipated recovery (generally considered to be less than one year from the balance sheet date); and

(iii) it is more likely than not that Alleghany will sell a debt security before recovery of its amortized cost basis.

To the extent that an equity security in an unrealized loss position is not impaired based on the initial review described above, Alleghany then further evaluates such equity security and deems it to be other-than-temporarily impaired if its decline in fair value has existed for twelve months or more or if its decline in fair value from its cost is greater than 50 percent, absent compelling evidence to the contrary.

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Alleghany then evaluates all remaining equity securities that are in an unrealized loss position the cost of which:

(i) exceeds their fair value by 20 percent or more as of the balance sheet date; or

(ii) has exceeded their fair value continuously for six (6) months or more preceding the balance sheet date.

This evaluation takes into account quantitative and qualitative factors in determining whether such securities are other-than-temporarily impaired including:

• market valuation metrics associated with the equity security (e.g., dividend yield and price-to-earnings ratio);

• current views on the equity security, as expressed by either Alleghany’s internal stock analysts and/or by independent stock analysts or rating agencies; and

• discrete credit or news events associated with a specific company, such as negative news releases and rating agency downgrades with respect to the issuer of the investment.

To the extent that a debt security that is in an unrealized loss position is not impaired based on the initial review described above, Alleghany will consider a debt security to be impaired when it believes it to be probable that Alleghany will not be able to collect all amounts due under the security’s contractual terms.

Alleghany may ultimately record a realized loss after having originally concluded that the decline in value was temporary. Risks and uncertainties are inherent in the methodology Alleghany uses to assess other-than-temporary declines in value. Risks and uncertainties could include, but are not limited to, incorrect assumptions about financial condition, liquidity or future prospects, inadequacy of any underlying collateral, and unfavorable changes in economic or social conditions, interest rates or credit ratings.

There were no other-than-temporary impairment losses for the six months ended June 30, 2011. Other-than-temporary impairment losses for the six months ended June 30, 2010 reflect $6.8 million of unrealized losses that were deemed to be other-than-temporary and, as such, were required to be charged against earnings. Of the $6.8 million, $6.5 million of other-than-temporary impairment losses related to equity holdings (primarily in the energy sector), and $0.3 million related to debt security holdings (all of which were deemed to be credit-related). The determination that unrealized losses on such securities were other-than-temporary was primarily based on the severity and duration of the declines in fair value of such securities relative to their cost as of the balance sheet date.

After adjusting the cost basis of securities for the recognition of other-than-temporary impairment losses, the gross unrealized investment losses for debt and equity securities as of June 30, 2011 were deemed to be temporary, based on, among other things:

• the duration of time and the relative magnitude to which fair values of these investments have been below cost was not indicative of an other-than-temporary impairment loss (for example, no equity security was in a continuous unrealized loss position for twelve months or more as of June 30, 2011);

• the absence of compelling evidence that would cause Alleghany to call into question the financial condition or near-term prospects of the issuer of the investment; and

• Alleghany’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery.

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Such gross unrealized investment losses and related fair values for debt securities and equity securities as of June 30, 2011 and December 31, 2010, were as follows (in millions):

	2011				2010
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Debt securities:
U.S. Government obligations
Less than 12 months	$	34.7	$	0.4	$	49.7	$	1.2
More than 12 months		—		—		—		—
Mortgage and asset-backed securities
Less than 12 months		102.6		0.9		170.8		2.8
More than 12 months		32.4		3.0		39.5		3.5
States, municipalities and political subdivision bonds
Less than 12 months		197.2		2.6		349.1		14.4
More than 12 months		6.7		0.5		7.7		0.6
Foreign bonds
Less than 12 months		15.7		0.7		45.2		0.9
More than 12 months		—		—		—		—
Corporate bonds and other
Less than 12 months		56.5		1.1		63.1		1.4
More than 12 months		—		—		—		—
Total debt securities
Less than 12 months		406.7		5.7		677.9		20.7
More than 12 months		39.1		3.5		47.2		4.1
Equity securities — Common Stock
Less than 12 months		287.9		16.5		139.5		5.6
More than 12 months		—		—		—		—
Equity securities — Preferred Stock
Less than 12 months		—		—		—		—
More than 12 months		—		—		—		—
Total temporarily impaired securities
Less than 12 months		694.6		22.2		817.4		26.3
More than 12 months		39.1		3.5		47.2		4.1
Total	$	733.7	$	25.7	$	864.6	$	30.4

As of June 30, 2011, Alleghany held a total of 147 debt and equity securities that were in an unrealized loss position, of which 15 securities, all debt securities, were in an unrealized loss position continuously for 12 months or more. Of the debt securities that were in an unrealized loss position, all were mortgage and asset-backed securities, and states, municipalities and political subdivision bonds. As of June 30, 2011, substantially all of Alleghany’s debt securities were rated investment grade. As of June 30, 2011, non-income producing invested assets were insignificant.

8. Income Taxes

As of June 30, 2011, Alleghany believes there were no material uncertain tax positions that would require disclosure under GAAP.

The effective tax rate on earnings before income taxes was 16.9 percent for the first six months of 2011, compared with 23.4 percent for the corresponding 2010 period. The lower effective tax rate in 2011 primarily reflects the impact of higher dividends received deductions and lower pre-tax earnings in the first six months of 2011, partially offset by the absence of a foreign tax benefit which was significant in the 2010 period.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

References to the “Company,” “Alleghany,” “we,” “us,” and “our” in Items 2, 3 and 4 of Part I, as well as in Part II, of this Quarterly Report on Form 10-Q, or “this Form 10-Q,” refer to Alleghany Corporation and its consolidated subsidiaries unless the context otherwise requires. In addition, unless the context otherwise requires, references to

• “AIHL” are to our insurance holding company subsidiary Alleghany Insurance Holdings LLC,

• “RSUI” are to our subsidiary RSUI Group, Inc. and its subsidiaries,

• “CATA” are to our subsidiary Capitol Transamerica Corporation and its subsidiaries, and also include the operations and results of Platte River Insurance Company, or “Platte River,” unless the context otherwise requires,

• “PCC” are to our subsidiary Pacific Compensation Corporation,

• “AIHL Re” are to our subsidiary AIHL Re LLC, and

• “Alleghany Properties” are to our subsidiary Alleghany Properties Holdings LLC and its subsidiaries.

Cautionary Statement Regarding Forward-Looking Information

“Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Quantitative and Qualitative Disclosures About Market Risk” contain disclosures which are forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements include all statements that do not relate solely to historical or current facts, and can be identified by the use of words such as “may,” “will,” “expect,” “project,” “estimate,” “anticipate,” “plan,” “believe,” “potential,” “should,” “continue” or the negative versions of those words or other comparable words. These forward-looking statements are based upon our current plans or expectations and are subject to a number of uncertainties and risks that could significantly affect current plans, anticipated actions and our future financial condition and results. These statements are not guarantees of future performance, and we have no specific intention to update these statements. The uncertainties and risks include, but are not limited to,

• significant weather-related or other natural or human-made catastrophes and disasters;

• the cyclical nature of the property and casualty insurance industry;

• adverse loss development for events insured by our insurance operating units in either the current year or prior years;

• changes in market prices of our significant equity investments and changes in value of our debt securities portfolio;

• the long-tail and potentially volatile nature of certain casualty lines of business written by our insurance operating units;

• the cost and availability of reinsurance;

• exposure to terrorist acts;

• the willingness and ability of our insurance operating units’ reinsurers to pay reinsurance recoverables owed to our insurance operating units;

• changes in the ratings assigned to our insurance operating units;

• claims development and the process of estimating reserves;

• legal and regulatory changes, including the new federal financial regulatory reform of the insurance industry established by the Dodd-Frank Wall Street Reform and Consumer Protection Act;

• the uncertain nature of damage theories and loss amounts; and

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• increases in the levels of risk retention by our insurance operating units.

Additional risks and uncertainties include general economic and political conditions, including the effects of a prolonged U.S. or global economic downturn or recession; changes in costs; variations in political, economic or other factors; risks relating to conducting operations in a competitive environment; effects of acquisition and disposition activities, inflation rates or recessionary or expansive trends; changes in interest rates; extended labor disruptions, civil unrest or other external factors over which we have no control; and changes in our plans, strategies, objectives, expectations, or intentions, which may happen at any time at our discretion. As a consequence, current plans, anticipated actions and future financial condition and results may differ from those expressed in any forward-looking statements made by us or on our behalf. Readers are encouraged to review Item 1A, “Risk Factors,” in our Report on Form 10-K for the year ended December 31, 2010, or the “2010 10-K,” for a more detailed discussion of these risks and uncertainties.

Critical Accounting Estimates

The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America, or “GAAP,” requires us to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period covered by the financial statements. Critical accounting estimates are defined as those estimates that are important to the presentation of our financial condition and results of operations and require us to exercise significant judgment.

We review our critical accounting estimates and assumptions quarterly. These reviews include evaluating the adequacy of reserves for unpaid loss and loss adjustment expenses, or “LAE,” and reinsurance, analyzing the recoverability of deferred tax assets, assessing goodwill for impairment and evaluating our investment portfolio for other-than-temporary declines in estimated fair value. Actual results may differ from the estimates used in preparing the financial statements.

Readers are encouraged to review our 2010 10-K for a more complete description of our critical accounting estimates.

Consolidated Results of Operations

The following discussion and analysis presents a review of our results for the three and six months ended June 30, 2011 and 2010. You should read this review in conjunction with the unaudited consolidated financial statements and other data presented in this Form 10-Q as well as “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Risk Factors” contained in our 2010 10-K and our Quarterly Report on Form 10-Q for the quarter ended March 31, 2011. Our results for the first six months of 2011 are not indicative of operating results in future periods.

Overview

We are engaged, through AIHL and its subsidiaries, primarily in the property and casualty and surety insurance business. We also own and manage properties in the Sacramento, California region through our subsidiary Alleghany Properties and seek out strategic investments and conduct other activities at the parent level. Primarily through our wholly-owned subsidiary, Alleghany Capital Partners, we manage our public equity investments, including those held by our insurance operating units, as well as conduct equity investment and non-insurance acquisition research. Strategic investments currently include an approximately 33 percent ownership of the outstanding shares of common stock of Homesite Group Incorporated, or “Homesite,” a national, full-service, mono-line provider of homeowners insurance, and approximately 38 percent ownership of ORX Exploration, Inc., or “ORX,” a regional oil and gas exploration and production company. Our primary sources of revenues and earnings are our insurance operations and investments.

The profitability of our insurance operating units, and as a result, our profitability, is primarily impacted by the adequacy of premium rates, level of catastrophe losses, investment returns, intensity of competition and the cost of reinsurance. The adequacy of premium rates is affected mainly by the severity and frequency of claims, which are influenced by many factors, including natural disasters, regulatory measures and court decisions that define and expand the extent of coverage, and the effects of economic inflation on the amount of compensation due for injuries or losses. The ultimate adequacy of premium rates is not known with certainty at the time property and casualty insurance policies are issued because premiums are determined before claims are reported.

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Catastrophe losses, or the absence thereof, can have a significant impact on our results. For example, RSUI’s pre-tax catastrophe losses, net of reinsurance, were $26.4 million in the first six months of 2011, compared with $19.0 million in the first six months of 2010, and were $31.0 million in 2010, $6.7 million in 2009 and $97.9 million in 2008. Catastrophe losses in the first six months of 2011 primarily reflect net losses from severe weather, particularly tornados, in the southeastern and midwestern U.S. in April and May 2011. Catastrophe losses in 2008 primarily reflect net losses from 2008 third quarter Hurricanes Ike, Gustav and Dolly. The incidence and severity of catastrophes in any short period of time are inherently unpredictable. Catastrophes can cause losses in a variety of our property lines of business, and most of our past catastrophe-related claims have resulted from severe hurricanes. Longer-term natural catastrophe trends may be changing due to climate change, a phenomenon that has been associated with extreme weather events linked to rising temperatures, and includes effects on global weather patterns, sea, land and air temperatures, sea levels, rain and snow. Climate change, to the extent it produces rising temperatures and changes in weather patterns, could impact the frequency or severity of weather events such as hurricanes. To the extent climate change increases the frequency and severity of such weather events, our insurance operating units, particularly RSUI, may face increased claims, particularly with respect to properties located in coastal areas. Our insurance operating units take certain measures to mitigate against the frequency and severity of such events by giving consideration to these risks in their underwriting and pricing decisions and through the purchase of reinsurance.

As of June 30, 2011, we had consolidated total investments of $4.9 billion, of which $2.8 billion was invested in debt securities, $1.6 billion was invested in equity securities, $0.3 billion was invested in short-term investments and $0.2 billion was invested in other invested assets. Net realized capital gains, other-than-temporary impairment losses and net investment income related to such investment assets are subject to market conditions and management investment decisions and as a result can have a significant impact on our results. In the first six months of 2011, net realized capital gains were $41.2 million, compared with $59.8 million in the corresponding 2010 period, and there were no other-than-temporary impairment losses in the first six months of 2011, compared with $6.8 million in the corresponding 2010 period.

The profitability of our insurance operating units is also impacted by competition generally and price competition in particular. Historically, the performance of the property and casualty insurance industry has tended to fluctuate in cyclical periods of price competition and excess underwriting capacity followed by periods of high premium rates and shortages of underwriting capacity. Although an individual insurance company’s performance is dependent on its own specific business characteristics, the profitability of most property and casualty insurance companies tends to follow this cyclical market pattern. In the past few years, our insurance operating units have faced increasing competition as a result of an increased flow of capital into the insurance industry, with both new entrants and existing insurers seeking to gain market share. This has resulted in decreased premium rates and less favorable contract terms and conditions. In particular, RSUI and CATA’s specialty lines of business increasingly encounter competition from the standard market. We expect to continue to face strong competition in these and the other lines of business of our insurance operating units, and our insurance operating units may continue to experience decreases in premium rates and/or premium volume and less favorable contract terms and conditions.

As part of their overall risk and capacity management strategy, our insurance operating units purchase reinsurance for certain amounts of risk underwritten by them, especially catastrophe risks. The reinsurance programs purchased by our insurance operating units are generally subject to annual renewal. Market conditions beyond the control of our insurance operating units determine the availability and cost of the reinsurance protection they purchase, which may affect the level of business written and thus their profitability.

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The following table summarizes our consolidated revenues, costs and expenses and earnings.

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Revenues
Net premiums earned	$	183.9		$	188.8		$	364.8		$	383.6
Net investment income		28.6			32.7			60.2			64.1
Net realized capital gains		6.5			33.3			41.2			59.8
Other than temporary impairment losses		—			(5.7	)		—			(6.8	)
Other income		0.2			1.5			1.1			1.6
Total revenues	$	219.2		$	250.6		$	467.3		$	502.3
Costs and expenses
Loss and loss adjustment expenses	$	122.6		$	83.0		$	193.6		$	179.8
Commissions, brokerage and other underwriting expenses		64.1			64.8			130.6			131.1
Other operating expenses		8.7			8.1			19.0			16.9
Corporate administration		5.0			6.3			11.4			11.5
Interest expense		4.3			0.2			8.7			0.4
Total costs and expenses	$	204.7		$	162.4		$	363.3		$	339.7
Earnings before income taxes	$	14.5		$	88.2		$	104.0		$	162.6
Income taxes		(0.6	)		21.9			17.6			38.2
Net earnings	$	15.1		$	66.3		$	86.4		$	124.4
Revenues:
AIHL	$	221.5		$	249.0		$	467.5		$	498.9
Corporate activities*		(2.3	)		1.6			(0.2	)		3.4
Earnings (losses) before income taxes:
AIHL	$	27.5		$	93.5		$	126.1		$	171.8
Corporate activities*		(13.0	)		(5.3	)		(22.1	)		(9.2	)

* Corporate activities consist of Alleghany Properties, our investments in Homesite and ORX and corporate activities at the parent level.

Our earnings before income taxes in the 2011 second quarter decreased from the corresponding 2010 period, primarily reflecting higher loss and loss adjustment expenses, or “LAE,” and lower net realized capital gains. The increase in loss and LAE reflects higher catastrophe losses at RSUI in the 2011 period and a $15.0 million increase in PCC’s prior year reserves as of June 30, 2011. The loss and LAE amounts for the second quarters of 2011 and 2010 also reflect a $12.1 million release of prior year reserves at RSUI in the 2011 period, compared with a $21.3 million release in the corresponding 2010 period. Net realized capital gains in the second quarter of 2011 and 2010 relate primarily to sales of certain equity securities, some of which had their cost basis reduced in earlier periods for the recognition of unrealized losses through other-than-temporary impairment losses.

Our earnings before income taxes in the first six months of 2011 decreased from the corresponding 2010 period, primarily reflecting lower net realized capital gains, lower net premiums earned, higher loss and LAE, higher interest expense and lower net investment income, partially offset by an absence of other-than temporary impairment losses in 2011. Net realized capital gains in the first six months of 2011 and 2010 relate primarily to sales of certain equity securities, some of which had their cost basis reduced in earlier periods for the recognition of unrealized losses through other-than-temporary impairment losses. The decrease in net premiums earned reflects the impact of continuing competition at CATA and to a lesser degree, RSUI, as well as a reduction in net premiums written in certain specialty classes of business by CATA. The increase in loss and LAE primarily reflects a $15.0 million

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increase in PCC’s prior year reserves as of June 30, 2011. The decrease in net investment income primarily reflects a higher increase in our equity share of losses in Homesite, partially offset by higher dividend income in the 2011 period. Interest expense in the first six months of 2011 relates primarily to interest on our $300.0 million of 5.625% Senior Notes due September 15, 2020, or “Senior Notes”, which were issued on September 20, 2010.

The effective tax rate on earnings before income taxes was 16.9 percent for the first six months of 2011, compared with 23.4 percent for the corresponding 2010 period. The lower effective tax rate in 2011 primarily reflects the impact of higher dividends received deductions and lower pre-tax earnings in the first six months of 2011, partially offset by the absence of a foreign tax benefit which was significant in the 2010 period.

AIHL Operating Results

AIHL Operating Unit Pre-Tax Results

	RSUI			CATA			PCC			AIHL
	(in millions, except ratios)
Three months ended June 30, 2011
Gross premiums written	$	320.7		$	38.6		$	0.7		$	360.0
Net premiums written		206.6			36.2			1.8			244.6
Net premiums earned (1)	$	144.4		$	37.9		$	1.6		$	183.9
Loss and loss adjustment expenses		84.0			22.5			16.1			122.6
Commissions, brokerage and other underwriting expenses (2)		40.9			17.1			6.1			64.1
Underwriting profit (loss) (3)	$	19.5		$	(1.7	)	$	(20.6	)	$	(2.8	)
Net investment income (1)											31.0
Net realized capital gains (1)											6.5
Other than temporary impairment losses (1)											—
Other income (1)											0.1
Other expenses (2)											7.3
Earnings before income taxes										$	27.5
Loss ratio (4)		58.2	%		59.5	%		1006.1	%		66.7	%
Expense ratio (5)		28.3	%		45.1	%		386.6	%		34.9	%
Combined ratio (6)		86.5	%		104.6	%		1392.7	%		101.6	%
Three months ended June 30, 2010
Gross premiums written	$	300.6		$	47.0		$	(0.6	)	$	347.0
Net premiums written		185.1			44.3			(0.6	)		228.8
Net premiums earned (1)	$	146.3		$	41.5		$	1.0		$	188.8
Loss and loss adjustment expenses		62.3			19.6			1.1			83.0
Commissions, brokerage and other underwriting expenses (2)		40.2			19.2			5.4			64.8
Underwriting profit (loss) (3)	$	43.8		$	2.7		$	(5.5	)	$	41.0
Net investment income (1)											33.0
Net realized capital gains (1)											32.7
Other than temporary impairment losses (1)											(5.7	)
Other income (1)											0.2
Other expenses (2)											7.7
Earnings before income taxes										$	93.5
Loss ratio (4)		42.6	%		47.2	%		110.8	%		44.0	%
Expense ratio (5)		27.4	%		46.3	%		518.7	%		34.3	%
Combined ratio (6)		70.0	%		93.5	%		629.5	%		78.3	%

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	RSUI			CATA			PCC			AIHL
	(in millions, except ratios)
Six months ended June 30, 2011
Gross premiums written	$	532.9		$	76.2		$	1.1		$	610.2
Net premiums written		337.4			71.6			2.2			411.2
Net premiums earned (1)	$	286.0		$	77.1		$	1.7		$	364.8
Loss and loss adjustment expenses		135.2			41.6			16.8			193.6
Commissions, brokerage and other underwriting expenses (2)		82.3			36.5			11.8			130.6
Underwriting profit (loss) (3)	$	68.5		$	(1.0	)	$	(26.9	)	$	40.6
Net investment income (1)											61.2
Net realized capital gains (1)											41.2
Other than temporary impairment losses (1)											—
Other income (1)											0.3
Other expenses (2)											17.2
Earnings before income taxes										$	126.1
Loss ratio (4)		47.3	%		53.9	%		992.3	%		53.1	%
Expense ratio (5)		28.8	%		47.4	%		697.2	%		35.8	%
Combined ratio (6)		76.1	%		101.3	%		1689.5	%		88.9	%
Six months ended June 30, 2010
Gross premiums written	$	522.6		$	87.5		$	1.9		$	612.0
Net premiums written		315.5			82.5			1.8			399.8
Net premiums earned (1)	$	296.6		$	82.1		$	4.9		$	383.6
Loss and loss adjustment expenses		135.2			40.6			4.0			179.8
Commissions, brokerage and other underwriting expenses (2)		80.8			38.5			11.8			131.1
Underwriting profit (loss) (3)	$	80.6		$	3.0		$	(10.9	)	$	72.7
Net investment income (1)											66.3
Net realized capital gains (1)											55.5
Other than temporary impairment losses (1)											(6.8	)
Other income (1)											0.3
Other expenses (2)											16.2
Earnings before income taxes										$	171.8
Loss ratio (4)		45.6	%		49.4	%		82.1	%		46.8	%
Expense ratio (5)		27.3	%		47.0	%		241.7	%		34.2	%
Combined ratio (6)		72.9	%		96.4	%		323.8	%		81.0	%

(1) Represent components of total revenues.

(2) Commissions, brokerage and other underwriting expenses represent commission and brokerage expenses and that portion of salaries, administration and other operating expenses attributable primarily to underwriting activities, whereas the remainder constitutes other expenses.

(3) Represent net premiums earned less loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, net realized capital gains, other-than-temporary impairment losses, other income or other expenses. Underwriting profit does not replace net earnings determined in accordance with GAAP as a measure of profitability; rather, we believe that underwriting profit, which does not include net investment income, net realized capital gains, other-than-temporary impairment losses, other income or other expenses, enhances the understanding of AIHL’s insurance operating units’ operating results by highlighting net earnings attributable to their underwriting performance. With the addition of net investment income, net realized capital gains, other-than-temporary impairment losses, other income and other expenses, reported pre-tax net earnings (a GAAP measure) may show a profit despite

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an underlying underwriting loss. Where underwriting losses persist over extended periods, an insurance company’s ability to continue as an ongoing concern may be at risk. Therefore, we view underwriting profit as an important measure in the overall evaluation of performance.

(4) Loss and LAE divided by net premiums earned, all as determined in accordance with GAAP.

(5) Commissions, brokerage and other underwriting expenses divided by net premiums earned, all as determined in accordance with GAAP.

(6) The sum of the loss ratio and expense ratio, all as determined in accordance with GAAP, representing the percentage of each premium dollar an insurance company has to spend on loss and LAE, and commissions, brokerage and other underwriting expenses.

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Discussion of individual AIHL operating unit results follows, and AIHL investment results are discussed below under “AIHL Investment Results.”

RSUI

The increase in gross premiums written by RSUI in the second quarter and the first six months of 2011 from the corresponding 2010 periods primarily reflects growth in RSUI’s binding authority business and assumed premium writings from international insurance carriers. In addition, the increase in gross premiums written in the 2011 second quarter from the corresponding 2010 period also reflects growth in RSUI’s property line of business. Such increases were partially offset by the impact of reduced exposures of RSUI’s customers and continuing competition in certain of RSUI’s casualty lines of business.

Net premiums earned in the second quarter and first six months of 2011 primarily reflect gross premiums written during the third and fourth quarters of 2010 and the first quarter of 2011 being earned. RSUI’s net premiums earned decreased in the second quarter and first six months of 2011 as a result of lower gross premiums written in these earlier quarters as compared with gross premiums written in the third and fourth quarters of 2009 and the first quarter of 2010 which are reflected in the net premiums earned in the second quarter and first six months of 2010.

The increase in loss and LAE in the second quarter from the corresponding period in 2010 primarily reflects the impact of higher catastrophe losses in the 2011 period, and a smaller release of prior accident year reserves in the 2011 period. For the first six months of 2011, losses and LAE reflect higher catastrophe losses in the 2011 period than the corresponding period in 2010, offset by a larger release of prior accident year reserves in the 2011 period.

Catastrophe losses, net of reinsurance, were $26.4 million in the first six months of 2011, compared with $19.0 million in the first six months of 2010. Catastrophe losses in the first six months of 2011 primarily reflect net losses from severe weather, particularly tornados, in the southeastern and midwestern U.S. in April and May 2011.

Loss and LAE in the 2011 second quarter reflect a $12.1 million release of prior year reserves in RSUI’s casualty lines of business, compared with a $21.3 million release in the corresponding 2010 period. The $12.1 million release of prior year reserves in the 2011 second quarter relates primarily to the umbrella/excess liability, professional liability and general liability lines of business primarily for the 2004 through 2008 accident years, and reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods for such lines of business. The $21.3 million release of prior year reserves in the 2010 second quarter relates primarily to the general liability, professional liability and umbrella/excess liability lines of business primarily for the 2003 through 2007 accident years, and reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods for such lines of business.

Loss and LAE in the first six months of 2011 reflect a $27.9 million release of prior year reserves in RSUI’s casualty lines of business, compared with a net $13.8 million release in the corresponding 2010 period. In addition to the releases of prior year reserves in the second quarter of 2011 noted above, loss and LAE in the first six months of 2011 reflect a $15.8 million release of prior year casualty reserves in the 2011 first quarter, compared with a $7.5 million increase of prior year casualty reserves in the 2010 first quarter. The $15.8 million net release of prior year casualty reserves in the 2011 first quarter relates primarily to the umbrella/excess, general liability and professional liability lines of business, primarily for the 2004 through 2008 accident years, and reflects favorable loss emergence, compared with loss emergence patterns assumed in earlier periods for such lines of business. The $7.5 million increase in prior year casualty reserves in the 2010 first quarter resulted from an increase in estimated ultimate 2007 accident year losses for the directors and officers, or “D&O,” liability line of business, reflecting, in part, unfavorable loss emergence on certain sub-prime mortgage industry claims.

As noted above, there was favorable loss emergence in the first six months of 2011 compared with loss emergence patterns assumed in earlier periods for the umbrella/excess, general liability and professional liability lines of business. Specifically, cumulative losses for such lines of business, which include both loss payments and case reserves, in respect of prior accident years were expected to be higher through June 30, 2011 than the actual cumulative losses through that date. The amount of lower cumulative losses, expressed as a percentage of carried loss and LAE reserves at the beginning of the year, was 3.3 percent. Such reduction did not impact the assumptions used in estimating RSUI’s loss and LAE liabilities for its umbrella/excess, general liability and professional liability lines of business in the first six months of 2011.

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The decrease in RSUI’s underwriting profit in the 2011 second quarter from the corresponding 2010 period primarily reflects an increase in loss and LAE and a decrease in net premiums earned. The decrease in RSUI’s underwriting profit in the first six months of 2011 from the corresponding 2010 period primarily reflects a decrease in net premiums earned.

In general, rates at RSUI in the first six months of 2011, compared with the corresponding period in 2010, reflect overall industry trends of downward pricing as a result of steady competitive pressures, except for certain areas with catastrophe-exposed property, where such pressures appear to be moderating.

As discussed in the 2010 10-K, RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program (which covers catastrophe risks including, among others, windstorms and earthquakes) and per risk reinsurance program run on an annual basis from May 1 to the following April 30 and thus expired on April 30, 2011. RSUI renewed all of its catastrophe reinsurance program for the 2011-2012 period, and the new reinsurance program is similar to the expired program. The new reinsurance program provides coverage in two layers for $400.0 million of losses in excess of a $100.0 million net retention after application of the surplus share treaties, facultative reinsurance and per risk covers. The first layer provides coverage for $100.0 million of losses, before a 47.0 percent co-participation by RSUI (compared with a 33.0 percent co-participation under the expired program), in excess of the $100.0 million net retention, and the second layer provides coverage for $300.0 million of losses, before a 5.0 percent co-participation by RSUI, in excess of $200.0 million. In addition, RSUI’s property per risk reinsurance program for the 2011-2012 period provides RSUI with coverage for $90.0 million of losses, before a 10.0 percent co-participation by RSUI, in excess of a $10.0 million net retention per risk after application of the surplus share treaties and facultative reinsurance.

When structuring its catastrophe reinsurance program, RSUI considers a number of factors, including its gross limit exposure by geographic region, the attachment point of policy coverages within its book of business, its anticipated market share percentage of aggregate industry losses and the cost of reinsurance. RSUI also considers the modeled loss estimates under different scenarios produced by third-party catastrophic modeling software. For a 250 year return period, such models in 2011 produced a net loss after tax and a resulting decline in Alleghany’s consolidated stockholders’ equity as of June 30, 2011 ranging between 4 percent and 16 percent. Such modeled loss estimates do not necessarily represent RSUI’s minimum or maximum catastrophe exposures, and it is highly likely that RSUI’s actual incurred losses would vary significantly from any such estimates, as has been the case for RSUI historically. As such, there can be no assurances that RSUI will not incur a net loss in excess of such range of modeled loss estimates from one or more major catastrophic events. See risk factors set forth in Part I, Item 1A, “Risk Factors,” of our 2010 10-K.

As discussed in Note 5(a) to the Notes to Consolidated Financial Statements set forth in Item 8 of the 2010 10-K, RSUI reinsures its other lines of business through quota share treaties, except for professional liability, binding authority and (effective April 15, 2011) the general liability lines where RSUI retains all of such business. RSUI’s quota share reinsurance treaty for umbrella/excess lines of business renewed on June 1, 2011 on the same terms as the expiring treaty, providing coverage for policies with limits up to $30.0 million, with RSUI ceding 35.0 percent of the premium and loss for policies with limits up to $15.0 million and ceding 67.5 percent of the premium and loss for policies with limits in excess of $15.0 million up to $30.0 million. RSUI’s directors and officers liability line quota share reinsurance treaty renewed on July 1, 2011 on the same terms as the expiring treaty, providing coverage for policies with limits up to $20.0 million, with RSUI ceding 35.0 percent of the premium and loss for policies with limits up to $10.0 million and ceding 60.0 percent of the premium and loss for policies with limits in excess of $10.0 million up to $20.0 million.

CATA

The decrease in gross premiums written by CATA in the second quarter and first six months of 2011 from the corresponding 2010 periods primarily reflects continuing price competition in CATA’s property and casualty lines of business, including in excess and surplus markets, partially offset by higher gross premiums written in CATA’s commercial surety line of business. The decrease in CATA's property and casualty lines of business also reflects reduced writings of certain specialty classes of business through a program administrator in connection with a program where notice of termination of such program has been given (“Terminated Program Business”). CATA’s net premiums earned decreased in the second quarter and first six months of 2011 from the corresponding 2010 periods primarily reflecting the decrease in gross premiums written, partially offset by an increase in net premiums earned in CATA’s miscellaneous errors and omissions liability line of business.

The increase in loss and LAE in the second quarter and first six months of 2011 from the corresponding 2010 periods primarily reflects prior year reserve increases in the second quarter and first six months of 2011 compared with prior year reserve releases in the corresponding 2010 periods, partially offset by the impact of lower net premiums earned.

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Loss and LAE in the 2011 second quarter reflect a net $2.7 million increase of prior year reserves related primarily to the Terminated Program Business in the 2010 and 2009 accident years, partially offset by a decrease in prior year reserves in certain of CATA’s casualty lines of business. The net $2.7 million increase reflects unfavorable loss emergence compared with loss emergence patterns assumed in earlier periods for such business. The $3.5 million release in the 2010 second quarter reflects favorable loss emergence for various discontinued liability coverages related to asbestos and environmental impairment claims that arose from reinsurance assumed by a subsidiary of CATA between 1969 and 1976, based on a reserve study that was completed in the 2010 second quarter.

Loss and LAE in the first six months of 2011 reflect a $1.0 million net increase of prior year reserves in CATA’s property and casualty lines of business, compared with a $4.3 million release in the corresponding 2010 period. In addition to the increase of prior year reserves in the second quarter of 2011 and the release of prior year reserves in the 2010 second quarter noted above, loss and LAE in the first six months of 2011 reflect a net prior year reserve release of $1.7 million in the 2011 first quarter, compared with a reserve release of $0.8 million in the 2010 first quarter. The $1.7 million reserve release primarily relates to favorable development on the property line of business from the 2010 accident year and, to a lesser extent, a prior year reserve release in the casualty lines of business from older accident years, reflecting favorable loss emergence compared with loss emergence patterns assumed in earlier periods for such lines of business. The $0.8 million reserve release in the 2010 first quarter was primarily related to casualty prior accident year reserves.

There was unfavorable loss emergence related to the Terminated Program Business compared with loss emergence patterns assumed in earlier periods for such business. Specifically, cumulative losses for such line of business, which include both loss payments and case reserves, in respect of prior accident years were expected to be lower through June 30, 2011 than the actual cumulative losses through that date. The amount of higher cumulative losses, expressed as a percentage of carried loss and LAE reserves at the beginning of the year, was 3.6 percent.

The increase in loss and LAE and decrease in net premiums earned were the primary causes of the decreases in CATA’s underwriting profit in the second quarter and first six months of 2011 from the corresponding 2010 periods.

In general, rates at CATA in the first six months of 2011, compared with the corresponding 2010 period, reflect overall industry trends of downward pricing as a result of increased competition.

PCC

Commencing August 1, 2009, PCC ceased soliciting new or renewal business on a direct basis due to its determination that it was unable to write business at rates it deemed adequate due to the difficult state of the California workers’ compensation market and took corresponding expense reduction steps, including staff reductions, in light of such determination. Effective April 12, 2010, as part of a strategic repositioning effort, PCC changed its name from Employers Direct Corporation, changed the name of Pacific Compensation Insurance Company from Employers Direct Insurance Company, and took steps to emerge as a brokerage carrier at such time as it determines rates are adequate. In the first six months of 2011, PCC began writing a modest amount of new business through brokers.

PCC reported underwriting losses of $26.9 million and $10.9 million in the first six months of 2011 and 2010, respectively. The underwriting losses primarily reflect a lack of premiums earned for the reasons described above (particularly with respect to the first six months of 2011), combined with PCC’s ongoing staffing and related expenses. PCC’s underwriting loss for the first six months of 2011 also reflects a $15.0 million increase of prior accident year workers’ compensation loss reserves and LAE. Of the $15.0 million increase, $10.0 million related to an unanticipated increase in medical claims emergence and an absence of anticipated favorable indemnity claims emergence. PCC had anticipated favorable indemnity claims emergence based upon prior claims development experience which indicated that injured workers would be returning to work, curtailing lost wage costs. PCC believes the weak California employment environment has hindered the ability of injured workers to return to work and indirectly influenced indemnity claims. The remaining $5.0 million of the $15.0 million increase related to an increase in allocated LAE reserves arising in part from an increased utilization of outside counsel to assist in the settlement process, as well as a decrease in ceded loss and LAE reserves based on a second quarter 2011 review of reinsurance coverage estimates. The review of reinsurance coverage estimates also resulted in a $1.1 million decrease in ceded premiums earned, which increased net premiums earned.

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AIHL Investment Results

Following is information relating to AIHL’s investment results (in millions):

	Three months ended June 30,					Six months ended June 30,
	2011		2010			2011		2010
Net investment income	$	31.0	$	33.0		$	61.2	$	66.3
Net realized capital gains	$	6.5	$	32.7		$	41.2	$	55.5
Other than temporary impairment losses	$	—	$	(5.7	)	$	—	$	(6.8	)

Net Investment Income. The decrease in AIHL’s net investment income in the second quarter and first six months of 2011 from the corresponding 2010 periods is due principally to an absence of equity-method partnership income in the first six months of 2011 as such partnerships were dissolved in the 2010 third quarter, and the impact of ongoing negative cash flow at PCC, partially offset by higher dividend income.

Net Realized Capital Gains. Net realized capital gains in the second quarter and first six months of 2011 and 2010 relate primarily to sales of certain equity securities in the energy sector, some of which had their cost basis reduced in earlier periods for the recognition of unrealized losses through other-than-temporary impairment losses. Net realized capital gains in the first six months of 2011 also included the sales of certain equity securities in the defense sector.

Other-Than-Temporary Impairment Losses. There were no other-than-temporary impairment losses for the six months ended June 30, 2011. Other-than-temporary impairment losses for the six months ended June 30, 2010 reflect $6.8 million of unrealized losses that were deemed to be other-than-temporary and, as such, were required to be charged against earnings. Of the $6.8 million, $6.5 million of other-than-temporary impairment losses related to equity holdings (primarily in the energy sector), and $0.3 million related to debt security holdings (all of which were deemed to be credit-related). The determination that unrealized losses on such securities were other-than-temporary was primarily based on the severity and duration of the declines in fair value of such securities relative to their cost as of the balance sheet date.

After adjusting the cost basis of securities for the recognition of other-than-temporary impairment losses, the gross unrealized investment losses for debt and equity securities as of June 30, 2011 were deemed to be temporary, based on, among other things:

• the duration of time and the relative magnitude to which fair values of these investments have been below cost was not indicative of an other-than-temporary impairment loss (for example, no equity security was in a continuous unrealized loss position for twelve months or more as of June 30, 2011);

• the absence of compelling evidence that would cause us to call into question the financial condition or near-term prospects of the issuer of the investment; and

• our ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery.

See Note 7 to the Notes to the Unaudited Consolidated Financial Statements set forth in Item 1 of this Form 10-Q for further details concerning gross unrealized investment losses for debt and equity securities as of June 30, 2011.

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Corporate Activities Operating Results

The following table summarizes corporate activities’ results (in millions):

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Net investment income	$	(2.4	)	$	(0.3	)	$	(1.0	)	$	(2.2	)
Net realized capital gains		—			0.6			—			4.3
Other than temporary impairment losses		—			—			—			—
Other income		0.1			1.3			0.8			1.3
Total revenues	$	(2.3	)	$	1.6		$	(0.2	)	$	3.4
Corporate administration and other expenses		6.4			6.8			13.2			12.5
Interest expense		4.3			0.1			8.7			0.1
(Losses) before income taxes	$	(13.0	)	$	(5.3	)	$	(22.1	)	$	(9.2	)

Losses for corporate activities in the second quarter and first six months of 2011 generally reflect corporate administration, interest and other expenses and negative net investment income. Losses for corporate activities in the second quarter and first six months of 2010 generally reflect corporate administration and other expenses and negative net investment income, partially offset by net realized capital gains. The increase in losses before income taxes in the second quarter and first six months of 2011 from the corresponding 2010 periods primarily reflects an absence of net realized capital gains in the three and six months ended June 30, 2011, substantially higher interest expense, and higher negative net investment income. Interest expense in the second quarter and first six months of 2011 relates primarily to interest on our Senior Notes, which were issued on September 20, 2010 (see Note 7 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K for further details). The higher negative net investment income for the second quarter of 2011 compared with the corresponding period in 2010 was primarily due to an increase in our equity share of losses related to our investment in Homesite, partially offset by higher dividend income.

For the six months ended June 30, 2011 and 2010, net investment income included $7.1 million and $1.6 million, respectively, of our equity share of losses in Homesite, and $2.2 million and $2.8 million, respectively, of our equity share of losses in ORX. Homesite losses in the first six months of 2011 primarily reflect the impact of increased homeowners insurance claims from severe weather, particularly tornados, in the southeastern and midwestern U.S. in April and May 2011.

Reserve Review Process

AIHL’s insurance operating units periodically analyze, at least quarterly, liabilities for unpaid loss and LAE established in prior years and adjust their expected ultimate cost, where necessary, to reflect positive or negative development in loss experience and new information, including, for certain catastrophic events, revised industry estimates of the magnitude of a catastrophe. Adjustments to previously recorded liabilities for unpaid loss and LAE, both positive and negative, are reflected in our financial results in the periods in which these adjustments are made and are referred to as prior year reserve development. The following table presents the reserves established in connection with the loss and LAE of AIHL’s insurance operating units on a gross and net basis by line of business. These reserve amounts represent the accumulation of estimates of ultimate loss (including for incurred but not reported loss) and LAE.

	Property			Casualty(1)			CMP(2)			Surety			Workers’ Comp(3)			All Other(4)			Total
	(in millions)
June 30, 2011
Gross loss and LAE reserves	$	140.3		$	1,909.2		$	53.6		$	19.4		$	171.0		$	30.9		$	2,324.4
Reinsurance recoverables on unpaid losses		(43.6	)		(774.8	)		(0.1	)		(0.1	)		(8.8	)		(17.0	)		(844.4	)
Net loss and LAE reserves	$	96.7		$	1,134.4		$	53.5		$	19.3		$	162.2		$	13.9		$	1,480.0
December 31, 2010
Gross loss and LAE reserves	$	150.1		$	1,883.6		$	58.9		$	17.1		$	186.7		$	32.3		$	2,328.7
Reinsurance recoverables on unpaid losses		(52.0	)		(765.2	)		(1.0	)		(0.1	)		(10.9	)		(18.2	)		(847.4	)
Net loss and LAE reserves	$	98.1		$	1,118.4		$	57.9		$	17.0		$	175.8		$	14.1		$	1,481.3

(1) Primarily consists of umbrella/excess liability, D&O liability, professional liability and general liability.

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(2) Commercial multiple peril.

(3) Workers’ compensation amounts include PCC, net of purchase accounting adjustments (see Note 4(a) to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K). Such adjustments include a minor reduction of gross and net loss and LAE for acquisition date discounting, as required under purchase accounting. Workers’ compensation amounts also include minor balances from CATA.

(4) Primarily consists of loss and LAE reserves for terminated lines of business and loss reserves acquired in connection with prior acquisitions for which the sellers provided loss reserve guarantees. The loss and LAE reserves are ceded 100 percent to the sellers. Additional information regarding the loss reserve guarantees can be found in Note 5(c) to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

Changes in Loss and LAE Reserves between June 30, 2011 and December 31, 2010

Gross Reserves. Gross loss and LAE reserves as of June 30, 2011 decreased modestly from December 31, 2010 due primarily to reserve decreases in workers’ compensation and property lines of business, offset by increases in casualty lines of business. The decrease in workers’ compensation gross loss and LAE reserves primarily reflects the impact of PCC ceasing to solicit new or renewal business on a direct basis commencing August 1, 2009, partially offset by an increase in gross loss and LAE reserves by PCC as of June 30, 2011 related to prior accident years. The decrease in property gross loss and LAE reserves is mainly due to claim payments made by RSUI in the first six months of 2011. Such claim payments caused RSUI to reduce its case reserves from prior accident years, primarily related to 2008 third quarter hurricane losses.

Net Reserves. Net loss and LAE reserves as of June 30, 2011 decreased modestly from December 31, 2010 due primarily to reserve decreases in property and workers’ compensation lines of business, offset by increases in casualty lines of business. The decrease in property net loss and LAE reserves is mainly due to claim payments made by RSUI in the first six months of 2011. Such claim payments caused RSUI to reduce its case reserves from prior accident years, primarily related to 2008 third quarter hurricane losses. The decrease in workers’ compensation net loss and LAE reserves primarily reflects the impact of PCC ceasing to solicit new or renewal business on a direct basis commencing August 1, 2009, partially offset by an increase in net loss and LAE reserves by PCC as of June 30, 2011 related to prior accident years.

Reinsurance Recoverables

As of June 30, 2011, AIHL had total reinsurance recoverables of $872.6 million, consisting of $844.4 million of ceded outstanding loss and LAE and $28.2 million of recoverables on paid losses. RSUI’s reinsurance recoverables totaled $757.3 million of AIHL’s $872.6 million. The reinsurance purchased by AIHL’s insurance operating units does not relieve them from their obligations to their policyholders, and therefore, the financial strength of their reinsurers is important. Approximately 90.1 percent of AIHL’s reinsurance recoverables balance as of June 30, 2011 was due from reinsurers having an A.M. Best financial strength rating of A (Excellent) or higher. AIHL’s Reinsurance Security Committee, which includes certain of our officers and the chief financial officer of each of AIHL’s operating units and which manages the use of reinsurance by such operating units, has determined that reinsurers with a rating of A (Excellent) or higher have an ability to meet their ongoing obligations at a level that is acceptable to us.

Information regarding concentration of AIHL’s reinsurance recoverables as of June 30, 2011 is as follows (dollars in millions):

Reinsurer(1)	Rating(2)	Dollar Amount		Percentage
Swiss Re	A (Excellent)	$	156.2		17.9	%
Platinum Underwriters Holdings, Ltd.	A (Excellent)		97.8		11.2	%
The Chubb Corporation	A++ (Superior)		89.6		10.3	%
All other reinsurers			529.0		60.6	%
Total		$	872.6		100.0	%

(1) Reinsurance recoverables reflect amounts due from one or more reinsurance subsidiaries of the listed company.

(2) Represents the A.M. Best rating for the applicable reinsurance subsidiary or subsidiaries from which the reinsurance recoverable is due.

As of June 30, 2011, AIHL also had fully collateralized reinsurance recoverables of $91.2 million due from Darwin Professional Underwriters Inc., or “Darwin,” a specialty property and casualty insurer of which we owned 55 percent until October 2008, when it

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was merged with a subsidiary of Allied World Assurance Company Holdings, Ltd. The A.M. Best financial strength rating of Darwin was A (Excellent) as of June 30, 2011. AIHL had no allowance for uncollectible reinsurance as of June 30, 2011.

Financial Condition

Parent Level

General. In general, we follow a policy of maintaining a relatively liquid financial condition at the parent company. This policy has permitted us to expand our operations through internal growth at our subsidiaries and through acquisitions of, or substantial investments in, operating companies. As of June 30, 2011, we held marketable securities and cash of $658.9 million at the parent company and $612.4 million at AIHL, which totaled $1,271.3 million. We believe that we have and will have adequate internally generated funds, cash resources and unused credit facilities to provide for the currently foreseeable needs of our business, and we had no material commitments for capital expenditures as of June 30, 2011.

Stockholders’ equity increased to approximately $3.0 billion as of June 30, 2011, compared with approximately $2.9 billion as of December 31, 2010, representing an increase of 4.1 percent. The increase in stockholders’ equity primarily reflects net earnings and an increase in net unrealized appreciation in our investment portfolio in the first six months of 2011, partially offset by the repurchase of our common stock pursuant to our repurchase program described below.

As discussed in Note 7 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K, we issued $300.0 million of Senior Notes on September 20, 2010, and we entered into a credit agreement that provides for a two tranche revolving credit facility in an aggregate principal amount of up to $100.0 million on September 9, 2010. There were no borrowings under such credit agreement during the first six months of 2011.

Common Stock Repurchases. In July 2010, our Board of Directors authorized the repurchase of shares of our common stock, at such times and at prices as management may determine advisable, up to an aggregate of $300.0 million. During the first six months of 2011, we repurchased an aggregate of 66,341 shares of our common stock in the open market for $21.3 million, at an average price per share of $320.72 (share and average price amounts are not adjusted for the stock dividend declared in February 2011). As of June 30, 2011 and December 31, 2010, we had 8,884,873 and 8,941,885 shares of our common stock outstanding, respectively. Unless stated otherwise, all preceding figures have been adjusted to reflect the common stock dividend declared in February 2011 and paid in April 2011.

Subsidiaries

Financial strength is also a high priority of our subsidiaries, whose assets stand behind their financial commitments to their customers and vendors. We believe that our subsidiaries have and will have adequate internally generated funds, cash resources, and unused credit facilities to provide for the currently foreseeable needs of their businesses. Our subsidiaries had no material commitments for capital expenditures as of June 30, 2011.

AIHL. The obligations and cash outflow of AIHL’s insurance operating units include claim settlements, administrative expenses and purchases of investments. In addition to premium collections, cash inflow is obtained from interest and dividend income and maturities and sales of investments. Because cash inflow from premiums is received in advance of cash outflow required to settle claims, AIHL’s insurance operating units accumulate funds which they invest pending the need for liquidity. As an insurance company’s cash needs can be unpredictable due to the uncertainty of the claims settlement process, AIHL’s portfolio, which includes those of its insurance operating units, is composed primarily of liquid securities such as debt securities and short-term investments to ensure the availability of funds for its cash needs. As of June 30, 2011, investments and cash represented 72.4 percent of the assets of AIHL and its insurance operating units.

Consolidated Investment Holdings

Overview. On a consolidated basis, our invested asset portfolio was approximately $4.9 billion as of June 30, 2011, an increase of 1.9 percent from December 31, 2010. The increase reflects a net increase in unrealized appreciation on our investment portfolio during the first six months of 2011, partially offset by negative cash flow at PCC and our repurchase of common stock pursuant to our

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repurchase program. Negative cash flow at PCC was a result of PCC ceasing to solicit new or renewal business on a direct basis commencing August 1, 2009.

The overall weighted-average credit quality rating of our debt securities portfolio was AA+ as of June 30, 2011. Although many of our debt securities, which consist predominantly of states, municipalities and political subdivision bonds, are insured by third-party financial guaranty insurance companies, the impact of such insurance was not significant to the debt securities credit quality rating as of June 30, 2011.

Fair Value. The estimated carrying values and fair values of our consolidated financial instruments as of June 30, 2011 and December 31, 2010 were as follows (in millions):

	June 30, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets
Investments (excluding equity method investments)*	$	4,726.9	$	4,726.9	$	4,622.7	$	4,622.7
Liabilities
Senior Notes	$	299.0	$	308.9	$	298.9	$	291.8

* This table includes available-for-sale investments (securities as well as partnership investments carried at fair value that are included in other invested assets). This table excludes investments accounted for using the equity method (Homesite, ORX and other investments) and certain loans receivable that are carried at cost, all of which are included in other invested assets. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is discussed below.

GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. In addition, GAAP has a three tiered hierarchy for inputs used in management’s determination of fair value of financial instruments that emphasizes the use of observable inputs over the use of unobservable inputs by requiring that the observable inputs be used when available. Observable inputs are market participant assumptions based on market data obtained from sources independent of the reporting entity. Unobservable inputs are the reporting entity’s own assumptions about market participant assumptions based on the best information available under the circumstances. In assessing the appropriateness of using observable inputs in making our fair value determinations, we consider whether the market for a particular security is “active” or not based on all the relevant facts and circumstances. For example, we may consider a market to be inactive if there are relatively few recent transactions or if there is a significant decrease in market volume. Furthermore, we consider whether observable transactions are “orderly” or not. We do not consider a transaction to be orderly if there is evidence of a forced liquidation or other distressed condition, and as such, little or no weight is given to that transaction as an indicator of fair value.

The hierarchy is broken down into three levels based on the reliability of inputs as follows:

• “Level 1” — Valuations are based on unadjusted quoted prices in active markets for identical, unrestricted assets. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these assets does not involve any meaningful degree of judgment. An active market is defined as a market where transactions for the financial instrument occur with sufficient frequency and volume to provide pricing information on an ongoing basis. Our Level 1 assets generally include publicly traded common stocks and debt securities issued directly by the U.S. Government, where our valuations are based on quoted market prices.

• “Level 2” — Valuations are based on quoted market prices where such markets are not deemed to be sufficiently “active.” In such circumstances, additional valuation metrics will be used which involve direct or indirect observable market inputs. Our Level 2 assets generally include preferred stocks and debt securities other than debt issued directly by the U.S. Government. Our Level 2 liabilities include the Senior Notes. Substantially all of the determinations of value in this category are based on a single quote from third-party dealers and pricing services. As we generally do not make any adjustments thereto, such quote typically constitutes the sole input in our determination of the fair value of these types of securities. In developing a quote, such third-parties will use the terms of the security and market-based inputs. Terms of the security include coupon, maturity date, and any special provisions that may, for example, enable the investor, at its election, to redeem the security prior to its scheduled maturity date. Market-based inputs include the level of interest rates applicable to comparable securities in the market place and current credit rating(s) of the security. Such quotes are generally non-binding.

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• “Level 3” — Valuations are based on inputs that are unobservable and significant to the overall fair value measurement. Valuation under Level 3 generally involves a significant degree of judgment on our part. Our Level 3 assets are primarily limited to partnership investments. Net asset value quotes from the third-party general partner of the entity in which such investments are held, which will often be based on unobservable market inputs, constitute the primary input in our determination of the fair value of such assets.

We validate the reasonableness of our fair value determinations for Level 2 investment securities by testing the methodology of the relevant third-party dealer or pricing service that provides the quotes upon which the fair value determinations are made. We test the methodology by comparing such quotes with prices from executed market trades when such trades occur. We discuss with the relevant third-party dealer or pricing service any identified material discrepancy between the quote derived from its methodology and the executed market trade in order to resolve the discrepancy. We use the quote from the third-party dealer or pricing service unless we determine that the methodology used to produce such quote is not in compliance with GAAP. In addition to such procedures, we also compare the aggregate amount of the fair value for such Level 2 securities with the aggregate fair value provided by a third-party financial institution. Furthermore, we review the reasonableness of our classification of securities within the three-tiered hierarchy to ensure that the classification is consistent with GAAP.

The estimated fair values of our financial instruments as of June 30, 2011 and December 31, 2010 allocated among the three levels set forth above were as follows (in millions):

	Level 1		Level 2		Level 3		Total
As of June 30, 2011
Equity securities:
Common stock(1)	$	1,642.1	$	—	$	—	$	1,642.1
Preferred stock		—		—		—		—
Debt securities:
U.S. Government obligations		271.9		30.5		—		302.4
Mortgage and asset-backed securities(2)		—		1,006.3		—		1,006.3
States, municipalities and political subdivision bonds		—		1,000.6		—		1,000.6
Foreign bonds		—		90.3		—		90.3
Corporate bonds and other		—		395.6		—		395.6
		271.9		2,523.3		—		2,795.2
Short-term investments		87.4		175.0		—		262.4
Other invested assets(3)		—		—		27.2		27.2
Investments (excluding equity method investments)	$	2,001.4	$	2,698.3	$	27.2	$	4,726.9
Senior Notes	$	—	$	308.9	$	—	$	308.9
As of December 31, 2010
Equity securities:
Common stock(1)	$	1,500.7	$	—	$	—	$	1,500.7
Preferred stock		—		—		—		—
Debt securities:
U.S. Government obligations		307.3		30.5		—		337.8
Mortgage and asset-backed securities(2)		—		866.5		—		866.5
States, municipalities and political subdivision bonds		—		1,068.5		—		1,068.5
Foreign bonds		—		114.2		—		114.2
Corporate bonds and other		—		445.4		—		445.4
		307.3		2,525.1		—		2.832.4
Short-term investments		86.4		178.4		—		264.8
Other invested assets(3)		—		—		24.8		24.8
Investments (excluding equity method investments)	$	1,894.4	$	2,703.5	$	24.8	$	4,622.7
Senior Notes	$	—	$	291.8	$	—	$	291.8

(1) Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

(2) Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to residential mortgage-backed securities, or

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“RMBS,” $190.5 million related to commercial mortgage-backed securities, or “CMBS,” and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

(3) Level 3 securities consist of partnership investments. The carrying value of partnership investments of $27.2 million increased by $2.4 million from the December 31, 2010 carrying value of $24.8 million, due primarily to an increase in estimated fair value during the period.

Mortgage- and Asset-Backed Securities. As of June 30, 2011, our mortgage- and asset-backed securities portfolio consisted of the following and was backed by the following types of underlying collateral (in millions):

Type of Underlying Collateral	Fair Value		Average Rating
RMBS: guaranteed by FNMA or FHLMC (1)	$	120.7	Aaa /AAA
RMBS: guaranteed by GNMA (2)		360.3	Aaa /AAA
RMBS: Alt A		10.8	A1 /AA+
RMBS: Sub-prime		2.2	Baa2
All other		512.3	Aaa/AAA
Total	$	1,006.3	Aaa /AAA

(1) “FNMA” refers to the Federal National Mortgage Association, and “FHLMC” refers to the Federal Home Loan Mortgage Corporation.

(2) “GNMA” refers to the Government National Mortgage Association.

States, Municipalities and Political Subdivision Bonds. The following table details the top five state exposures of our states, municipalities and political subdivision bond portfolio as of June 30, 2011 (in millions):

	General Obligation		Special Revenue		Total Fair Value
Texas	$	60.9	$	28.3	$	89.2
Washington		49.3		13.3		62.6
Massachusetts		4.6		56.2		60.8
New York		4.5		49.5		54.0
Colorado		31.2		14.8		46.0
All other		226.0		399.8		625.8
	$	376.5	$	561.9	$	938.4
Advance refunded / escrowed to maturity bonds						62.2
Total states, municipalities and political subdivision bond portfolio					$	1,000.6

Recent Accounting Standards

Recently Adopted

In July 2010, the Financial Accounting Standards Board, or “FASB,” issued guidance that provides for additional financial statement disclosure regarding financing receivables, including the credit quality and allowance for credit losses associated with such assets. This guidance is generally effective for interim and annual periods beginning after December 15, 2010, with certain disclosures effective for interim and annual periods ending on or after December 31, 2010. We fully adopted this guidance in the 2011 first quarter, and the implementation did not have any impact on our results of operations and financial condition.

Future Application of Accounting Standards

In June 2011, the FASB issued guidance on the presentation of comprehensive income. This guidance increases the prominence of other comprehensive income in the financial statements and eliminates the current option to report other comprehensive income and its components in the statement of changes in equity, and does not change the items that must be reported in other comprehensive income. This guidance is generally effective for interim and annual periods beginning after December 15, 2011. We will adopt this

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guidance in the 2012 first quarter, and we do not currently believe that the implementation will have an impact on our results of operations and financial condition.

In May 2011, FASB issued guidance that addresses requirements for measuring fair value. Among other things, the guidance clarifies that the “highest and best use” valuation premise applies only to non-financial assets, and that premiums or discounts should be applied to valuations of an individual asset or liability only when market participants would do so. The guidance also permits measurement of fair value of financial instruments (that are carried at fair value) based on an entity’s net exposure to a particular market or credit risk on a net basis if there is evidence that the entity manages its financial instruments in this way. The guidance provides for additional financial statement disclosure regarding fair value measurements, including disclosure involving transfers between categories within the fair value hierarchy, and quantitative and qualitative information about fair value measurements that involve a significant degree of judgment. This guidance is effective for interim and annual periods ending after December 15, 2011. We will adopt this guidance in the first quarter of 2012, and we do not believe the implementation will have a material impact on our results of operations and financial condition.

In October 2010, the FASB issued guidance that provides additional clarification for costs associated with acquiring or renewing insurance contracts. This guidance states that only incremental, direct costs associated with the successful acquisition of a new or renewal insurance contract may be capitalized as deferred acquisition costs. Furthermore, such costs: (i) must be essential to the contract transaction; (ii) would not have been incurred had the contract transaction not occurred; and (iii) must be related directly to the acquisition activities involving underwriting, policy issuance and processing, medical and inspection, and sales force contract selling. Advertising costs should be included in deferred acquisition costs only if the capitalization criteria in separate “direct-response” advertising guidance within GAAP are met. All other acquisition-related costs and other expenses should be charged to expense as incurred. This guidance is effective for interim and annual periods beginning after December 15, 2011, with early adoption permitted (but only at the beginning of an entity’s annual reporting period). We will adopt this guidance in the 2012 first quarter, and we do not currently believe that the implementation will have a material impact on our results of operations and financial condition.

Item 3. Quantitative and Qualitative Disclosures about Market Risk.

Market risk is the risk of loss from adverse changes in market prices and rates, such as interest rates, foreign currency exchange rates and commodity prices. The primary market risk related to our non-trading financial instruments is the risk of loss associated with adverse changes in interest rates. We invest in equity securities which are subject to fluctuations in market value (refer to Item 7A set forth in Item 8 of the 2010 10-K). We also purchase debt securities with fixed maturities that expose us to risk related to adverse changes in interest rates. We hold our equity securities and debt securities as available for sale. Any changes in the fair value in these securities, net of tax, would be recorded as a component of other comprehensive income. However, if a decline in fair value relative to cost is believed to be other than temporary, a loss is generally recorded on our statement of earnings.

Debt Securities and Senior Notes. The primary market risk for our and our subsidiaries’ debt securities is interest rate risk at the time of refinancing. We monitor the interest rate environment to evaluate refinancing opportunities. We generally do not use derivatives to manage market and interest rate risks. The tables below present sensitivity analyses as of June 30, 2011 of our (i) consolidated debt securities and (ii) Senior Notes, that are sensitive to changes in interest rates. Sensitivity analysis is defined as the measurement of potential change in future earnings, fair values, or cash flows of market sensitive instruments resulting from one or more selected hypothetical changes in interest rates over a selected time. In the sensitivity analysis model below, we use a +/- 300 basis point range of change in interest rates to measure the hypothetical change in fair value of the financial instruments included in the analysis. The change in fair value is determined by calculating hypothetical June 30, 2011 ending prices based on yields adjusted to reflect a +/- 300 basis point range of change in interest rates, comparing these hypothetical ending prices to actual ending prices, and multiplying the difference by the par outstanding.

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As of June 30, 2011 (in millions)

Interest rate shifts	-300		-200		-100		0		100			200			300
Assets:
Debt securities, fair value	$	3,122.8	$	3,011.3	$	2,904.5	$	2,795.2	$	2,680.0		$	2,567.4		$	2,460.9
Estimated change in fair value	$	327.6	$	216.1	$	109.3		—	$	(115.2	)	$	(227.8	)	$	(334.3	)
Liabilities:
Senior Notes, fair value	$	384.9	$	357.3	$	332.1	$	308.9	$	287.8		$	268.3		$	250.5
Estimated change in fair value	$	76.0	$	48.4	$	23.2		—	$	(21.1	)	$	(40.6	)	$	(58.4	)

This sensitivity analysis provides only a limited, point-in-time view of the market risk of the financial instruments discussed above. The actual impact of changes in market prices and market interest rates may differ significantly from those shown in the above sensitivity analysis. This sensitivity analysis is further limited because it does not consider any actions we could take in response to actual and/or anticipated changes in market prices and in market interest rates.

Partnership Investments. In addition to debt and equity securities, we invest in several partnerships which are subject to fluctuations in market value. Partnership investments are included in other invested assets. The carrying value of partnership investments accounted for on an available-for-sale basis was $27.2 million as of June 30, 2011 and $24.8 million as of December 31, 2010.

Item 4. Controls and Procedures.

Disclosure Controls and Procedures

We carried out an evaluation, under the supervision and with the participation of our management, including our chief executive officer, or “CEO,” and our chief financial officer, or “CFO,” of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this Form 10-Q Report pursuant to Rule 13a-15(e) or 15d-15(e) promulgated under the Securities Exchange Act of 1934, or the “Exchange Act.” Based on that evaluation, our management, including our CEO and CFO, concluded that our disclosure controls and procedures were effective as of that date to provide reasonable assurance that information required to be disclosed by us in reports that we file or submit under the Exchange Act is (i) recorded, processed, summarized, and timely reported as specified in the Securities and Exchange Commission’s rules and forms and (ii) accumulated and communicated to our management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure. Our disclosure controls and procedures were designed to provide such assurance; however, we note that the design of any system of controls is based in part upon certain assumptions about the likelihood of future events, and we cannot assure you that any design will succeed in achieving its stated goals under all potential future conditions, regardless of how remote.

Changes in Internal Control Over Financial Reporting

No changes occurred during the three months ended June 30, 2011 in our internal control structure over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

35

PART II. OTHER INFORMATION

Item 1A. Risk Factors.

There are no material changes from the risk factors set forth in Part I, Item 1A, “Risk Factors,” of our 2010 10-K. Please refer to that section for disclosures regarding what we believe are the more significant risks and uncertainties related to our businesses.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

(c) Issuer Purchases of Equity Securities.

The following table summarizes our common stock repurchases for the quarter ended June 30, 2011:

Period	Total Number of Shares  Purchased (1)		Average Price Paid per Share (1)		Total Number  of Shares Purchased as Part of Publicly Announced Plans or Programs (2)		Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs
April 1 to April 30		—	$	—		—
May 1 to May 31		5,633	$	325.93		5,633
June 1 to June 30		39,854	$	327.17		39,854
Total		45,487	$	327.02		45,487	$	277,306,560

(1) Share and average price amounts are not adjusted for the stock dividend declared in February 2011.

(2) All shares represent shares repurchased pursuant to an authorization of the Board of Directors, announced in July 2010, to repurchase shares of our common stock, at such times and at prices as management may determine advisable, up to an aggregate of $300.0 million.

Item 6. Exhibits.

Exhibit Number	Description
31.1	Certification of the Chief Executive Officer of the Company pursuant to Rule 13a-14(a) or Rule 15(d)-14(a) of the Securities Exchange Act of 1934, as amended.
31.2	Certification of the Chief Financial Officer of the Company pursuant to Rule 13a-14(a) or Rule 15(d)-14(a) of the Securities Exchange Act of 1934, as amended.
32.1	Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. This exhibit shall not be deemed “filed” as a part of this report on Form 10-Q.
32.2	Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. This exhibit shall not be deemed “filed” as a part of this report on Form 10-Q.
101.1	Interactive Data Files formatted in XBRL (Extensible Business Reporting Language): (i) Consolidated Balance Sheets as of June 30, 2011 and December 31, 2010; (ii) Consolidated Statements of Earnings and Comprehensive Income for the three and six months ended June 30, 2011 and 2010; (iii) Consolidated Statements of Cash Flows for the six months ended June 30, 2011 and 2010; and (iv) Notes to Unaudited Consolidated Financial Statements. As provided in Rule 406T of Regulation S-T, this Exhibit 101.1 is deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, is deemed not filed for purposes of Section 18 of the Exchange Act and otherwise is not subject to liability under those sections.

36

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ALLEGHANY CORPORATION Registrant
Date: August 4, 2011	By:	/s/    Roger B. Gorham
		Roger B. Gorham
		Senior Vice President (and chief financial officer)

37

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Weston M. Hicks, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Alleghany Corporation (the “Registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

4. The Registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and have:

a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. evaluated the effectiveness of the Registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. disclosed in this report any change in the Registrant’s internal control over financial reporting that occurred during the Registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting; and

5. The Registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant’s auditors and the audit committee of Registrant’s board of directors (or persons performing the equivalent functions):

a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant’s ability to record, process, summarize and report financial information; and

b. any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant’s internal control over financial reporting.

Date: August 4, 2011

/s/ Weston M. Hicks

Weston M. Hicks

President and chief executive officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Roger B. Gorham, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Alleghany Corporation (the “Registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

4. The Registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and have:

a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. evaluated the effectiveness of the Registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. disclosed in this report any change in the Registrant’s internal control over financial reporting that occurred during the Registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting; and

5. The Registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant’s auditors and the audit committee of Registrant’s board of directors (or persons performing the equivalent functions):

a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant’s ability to record, process, summarize and report financial information; and

b. any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant’s internal control over financial reporting.

Date: August 4, 2011

/s/ Roger B. Gorham

Roger B. Gorham

Chief Financial Officer

EX-32.1

Exhibit 32.1

ALLEGHANY CORPORATION

CERTIFICATION

In connection with the periodic report of Alleghany Corporation (the “Company”) on Form 10-Q for the quarter ended June 30, 2011, as filed with the Securities and Exchange Commission (the “Report”), I, Weston M. Hicks, President and chief executive officer of the Company, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that:

(1) the Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934, and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

This Certification, which accompanies the Report, has not been, and shall not be deemed, “filed” with the Securities and Exchange Commission.

Date: August 4, 2011	By:	/s/ Weston M. Hicks
		Weston M. Hicks
		President and chief executive officer

EX-32.2

Exhibit 32.2

ALLEGHANY CORPORATION

CERTIFICATION

In connection with the periodic report of Alleghany Corporation (the “Company”) on Form 10-Q for the quarter ended June 30, 2011, as filed with the Securities and Exchange Commission (the “Report”), I, Roger B. Gorham, Senior Vice President and chief financial officer of the Company, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that:

(1) the Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934, and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

This Certification, which accompanies the Report, has not been, and shall not be deemed, “filed” with the Securities and Exchange Commission.

Date: August 4, 2011	By:	/s/ Roger B. Gorham
		Roger B. Gorham
		Senior Vice President and chief financial officer

XML



Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Equity securities, cost	$ 1,406,542	$ 1,310,009
Debt securities, amortized cost	$ 2,706,761	$ 2,778,117
Common stock, shares authorized	22,000,000	22,000,000
Common stock, shares issued	9,117,787	9,300,448
Common stock, shares outstanding	9,117,787	9,300,448
Treasury stock, shares	232,914	351,532

XML



Consolidated Statements of Earnings and Comprehensive Income (USD $) In Thousands, except Per Share data	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Revenues
Net premiums earned	$ 183,878		$ 188,809		$ 364,858		$ 383,509
Net investment income	28,545		32,694		60,124		64,123
Net realized capital gains	6,490		33,308		41,182		59,775
Other than temporary impairment losses			(5,703)				(6,780)
Other income	248		1,501		1,133		1,634
Total revenues	219,161		250,609		467,297		502,261
Costs and expenses
Loss and loss adjustment expenses	122,619		83,027		193,641		179,654
Commissions, brokerage and other underwriting expenses	64,132		64,773		130,660		131,129
Other operating expenses	8,673		8,082		18,919		16,933
Corporate administration	5,002		6,324		11,381		11,558
Interest expense	4,268		216		8,720		435
Total costs and expenses	204,694		162,422		363,321		339,709
Earnings before income taxes	14,467		88,187		103,976		162,552
Income taxes	(615)		21,916		17,554		38,112
Net earnings	15,082		66,271		86,422		124,440
Other comprehensive income
Change in unrealized gains (losses), net of deferred taxes	(24,428)		(57,401)		74,834		(27,583)
Less: reclassification for net realized capital gains and other than temporary impairment losses, net of taxes	(4,218)		(17,943)		(26,768)		(34,447)
Other	(50)		50		(179)		99
Comprehensive income	$ (13,614)		$ (9,023)		$ 134,309		$ 62,509
Basic earnings per share	$ 1.69	[1]	$ 7.26	[1]	$ 9.69	[1]	$ 13.58	[1]
Diluted earnings per share	$ 1.68	[1]	$ 7.24	[1]	$ 9.66	[1]	$ 13.50	[1]

[1] Amounts reflect subsequent common stock dividends.

XML



Segment of Business, Earnings Before Income Taxes (Parenthetical) (Detail) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Homesite
Segment Reporting Information [Line Items]
Net investment income (Loss)	$ (7.1)	$ (1.6)
ORX Exploration, Inc
Segment Reporting Information [Line Items]
Net investment income (Loss)	$ (2.2)	$ (2.8)

XML



Document and Entity Information	6 Months Ended
	Jun. 30, 2011	Aug. 02, 2011
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Trading Symbol	Y
Entity Registrant Name	ALLEGHANY CORP /DE
Entity Central Index Key	0000775368
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		8,862,012

XML



Estimated Fair Value of Financial Instruments (Detail) (USD $)	Jun. 30, 2011		Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 1,642,108,000		$ 1,500,686,000
Debt securities	2,795,231,000		2,832,411,000
Short-term investments	262,445,000		264,811,000
Other invested assets	198,878,000		207,294,000
Investments (excluding equity method investments)	4,726,900,000		4,622,700,000
Senior Notes	298,979,000		298,923,000
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	87,400,000		86,400,000
Investments (excluding equity method investments)	2,001,400,000		1,894,400,000
Level 1 | Equity Securities | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	1,642,100,000	[1]	1,500,700,000	[1]
Level 1 | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	271,900,000		307,300,000
Level 1 | Debt Securities | U.S. Government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	271,900,000		307,300,000
Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	308,900,000		291,800,000
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	175,000,000		178,400,000
Investments (excluding equity method investments)	2,698,300,000		2,703,500,000
Level 2 | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	2,523,300,000		2,525,100,000
Level 2 | Debt Securities | U.S. Government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	30,500,000		30,500,000
Level 2 | Debt Securities | Mortgage and asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	1,006,300,000	[2]	866,500,000	[2]
Level 2 | Debt Securities | States, municipalities and political subdivision bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	1,000,600,000		1,068,500,000
Level 2 | Debt Securities | Foreign bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	90,300,000		114,200,000
Level 2 | Debt Securities | Corporate bonds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	395,600,000		445,400,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments (excluding equity method investments)	27,200,000		24,800,000
Level 3 | Partnership Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets	27,200,000	[3]	24,800,000	[3]
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments (excluding equity method investments)	4,726,900,000	[4]	4,622,700,000	[4]
Senior Notes	308,900,000	[5]	291,800,000	[5]
Equity Securities | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	1,642,100,000	[1]	1,500,700,000	[1]
Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	2,795,200,000		2,832,400,000
Debt Securities | U.S. Government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	302,400,000		337,800,000
Debt Securities | Mortgage and asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	1,006,300,000	[2]	866,500,000	[2]
Debt Securities | States, municipalities and political subdivision bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	1,000,600,000		1,068,500,000
Debt Securities | Foreign bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	90,300,000		114,200,000
Debt Securities | Corporate bonds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	395,600,000		445,400,000
Partnership Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets	$ 27,200,000	[3]	$ 24,800,000	[3]

[1] Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

[2] Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to residential mortgage-backed securities ("RMBS"), $190.5 million related to commercial mortgage-backed securities ("CMBS") and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

[3] Level 3 securities consist of partnership investments. The carrying value of partnership investments of $27.2 million increased by $2.4 million from the December 31, 2010 carrying value of $24.8 million, due primarily to an increase in estimated fair value during the period.

[4] This table includes available-for-sale investments (securities as well as partnership investments carried at fair value that are included in other invested assets). This table excludes investments accounted for using the equity method (Homesite, ORX and other investments) and certain loans receivable that are carried at cost, all of which are included in other invested assets. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is discussed below.

[5] See Note 7 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

XML



Investments

6 Months Ended

Jun. 30, 2011

Investments

7. Investments

(a) Fair Value

The estimated carrying values and fair values of Alleghany’s consolidated financial instruments as of June 30, 2011 and December 31, 2010 were as follows (in millions):

	June 30, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets
Investments (excluding equity method investments)*	$	4,726.9	$	4,726.9	$	4,622.7	$	4,622.7
Liabilities
Senior Notes**	$	299.0	$	308.9	$	298.9	$	291.8

* This table includes available-for-sale investments (securities as well as partnership investments carried at fair value that are included in other invested assets). This table excludes investments accounted for using the equity method (Homesite, ORX and other investments) and certain loans receivable that are carried at cost, all of which are included in other invested assets. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is discussed below.

** See Note 7 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. In addition, GAAP has a three-tiered hierarchy for inputs used in management’s determination of fair value of financial instruments that emphasizes the use of observable inputs over the use of unobservable inputs by requiring that the observable inputs be used when available. Observable inputs are market participant assumptions based on market data obtained from sources independent of the reporting entity. Unobservable inputs are the reporting entity’s own assumptions about market participant assumptions based on the best information available under the circumstances. In assessing the appropriateness of using observable inputs in making its fair value determinations, Alleghany considers whether the market for a particular security is “active” or not based on all the relevant facts and circumstances. For example, Alleghany may consider a market to be inactive if there are relatively few recent transactions or if there is a significant decrease in market volume. Furthermore, Alleghany considers whether observable transactions are “orderly” or not. Alleghany does not consider a transaction to be orderly if there is evidence of a forced liquidation or other distressed condition, and as such, little or no weight is given to that transaction as an indicator of fair value.

The hierarchy is broken down into three levels based on the reliability of inputs as follows:

• “Level 1” — Valuations are based on unadjusted quoted prices in active markets for identical, unrestricted assets. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these assets does not involve any meaningful degree of judgment. An active market is defined as a market where transactions for the financial instrument occur with sufficient frequency and volume to provide pricing information on an ongoing basis. Alleghany’s Level 1 assets generally include publicly traded common stocks and debt securities issued directly by the U.S. Government, where Alleghany’s valuations are based on quoted market prices.

• “Level 2” — Valuations are based on quoted market prices where such markets are not deemed to be sufficiently “active.” In such circumstances, additional valuation metrics will be used which involve direct or indirect observable market inputs. Alleghany’s Level 2 assets generally include preferred stocks and debt securities other than debt issued directly by the U.S. Government. Alleghany’s Level 2 liabilities include the Senior Notes. Substantially all of the determinations of value in this category are based on a single quote from third-party dealers and pricing services. As Alleghany generally does not make any adjustments thereto, such quote typically constitutes the sole input in its determination of the fair value of these types of securities. In developing a quote, such third-parties will use the terms of the security and market-based inputs. Terms of the security include coupon, maturity date, and any special provisions that may, for example, enable the investor, at its election, to redeem the security prior to its scheduled maturity date. Market-based inputs include the level of interest rates applicable to comparable securities in the market place and current credit rating(s) of the security. Such quotes are generally non-binding.

• “Level 3” — Valuations are based on inputs that are unobservable and significant to the overall fair value measurement. Valuation under Level 3 generally involves a significant degree of judgment on the part of Alleghany. Alleghany’s Level 3 assets are primarily limited to partnership investments. Net asset value quotes from the third-party general partner of the entity in which such investment is held, which will often be based on unobservable market inputs, constitute the primary input in Alleghany’s determination of the fair value of such assets.

Alleghany validates the reasonableness of its fair value determinations for Level 2 securities by testing the methodology of the relevant third-party dealer or pricing service that provides the quotes upon which the fair value determinations are made. Alleghany tests the methodology by comparing such quotes with prices from executed market trades when such trades occur. Alleghany discusses with the relevant third-party dealer or pricing service any identified material discrepancy between the quote derived from its methodology and the executed market trade in order to resolve the discrepancy. Alleghany uses the quote from the third-party dealer or pricing service unless Alleghany determines that the methodology used to produce such quote is not in compliance with GAAP. In addition to such procedures, Alleghany also compares the aggregate amount of the fair value for such Level 2 securities with the aggregate fair value provided by a third-party financial institution. Furthermore, Alleghany reviews the reasonableness of its classification of securities within the three-tiered hierarchy to ensure that the classification is consistent with GAAP.

The estimated fair values of Alleghany’s financial instruments as of June 30, 2011 and December 31, 2010 allocated among the three levels set forth above were as follows (in millions):

	Level 1		Level 2		Level 3		Total
As of June 30, 2011
Equity securities:
Common stock(1)	$	1,642.1	$	—	$	—	$	1,642.1
Preferred stock		—		—		—		—
Debt securities:
U.S. Government obligations		271.9		30.5		—		302.4
Mortgage and asset-backed securities(2)		—		1,006.3		—		1,006.3
States, municipalities and political subdivision bonds		—		1,000.6		—		1,000.6
Foreign bonds		—		90.3		—		90.3
Corporate bonds and other		—		395.6		—		395.6
		271.9		2,523.3		—		2,795.2
Short-term investments		87.4		175.0		—		262.4
Other invested assets(3)		—		—		27.2		27.2
Investments (excluding equity method investments)	$	2,001.4	$	2,698.3	$	27.2	$	4,726.9
Senior Notes	$	—	$	308.9	$	—	$	308.9
As of December 31, 2010
Equity securities:
Common stock(1)	$	1,500.7	$	—	$	—	$	1,500.7
Preferred stock		—		—		—		—
Debt securities:
U.S. Government obligations		307.3		30.5		—		337.8
Mortgage and asset-backed securities(2)		—		866.5		—		866.5
States, municipalities and political subdivision bonds		—		1,068.5		—		1,068.5
Foreign bonds		—		114.2		—		114.2
Corporate bonds and other		—		445.4		—		445.4
		307.3		2,525.1		—		2,832.4
Short-term investments		86.4		178.4		—		264.8
Other invested assets(3)		—		—		24.8		24.8
Investments (excluding equity method investments)	$	1,894.4	$	2,703.5	$	24.8	$	4,622.7
Senior Notes	$	—	$	291.8	$	—	$	291.8

(1) Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

(2) Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to residential mortgage-backed securities (“RMBS”), $190.5 million related to commercial mortgage-backed securities (“CMBS”) and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

(3) Level 3 securities consist of partnership investments. The carrying value of partnership investments of $27.2 million increased by $2.4 million from the December 31, 2010 carrying value of $24.8 million, due primarily to an increase in estimated fair value during the period.

(b) Available-For-Sale Securities

Available-for-sale securities as of June 30, 2011 and December 31, 2010 are summarized as follows (in millions):

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
As of June 30, 2011
Equity securities:
Common stock(1)	$	1,406.5	$	252.1	$	(16.5	)	$	1,642.1
Preferred stock		—		—		—			—
Debt securities:
U.S. Government obligations		298.4		4.4		(0.4	)		302.4
Mortgage and asset-backed securities(2)		971.4		38.8		(3.9	)		1,006.3
States, municipalities and political subdivision bonds		965.9		37.8		(3.1	)		1,000.6
Foreign bonds		88.5		2.5		(0.7	)		90.3
Corporate bonds and other		382.6		14.1		(1.1	)		395.6
		2,706.8		97.6		(9.2	)		2,795.2
Short-term investments		262.4		—		—			262.4
	$	4,375.7	$	349.7	$	(25.7	)	$	4,699.7
Industry Segment
AIHL insurance group	$	3,818.5	$	249.0	$	(25.7	)	$	4,041.8
Corporate activities		557.2		100.7		—			657.9
	$	4,375.7	$	349.7	$	(25.7	)	$	4,699.7

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
As of December 31, 2010
Equity securities:
Common stock(1)	$	1,310.0	$	196.3	$	(5.6	)	$	1,500.7
Preferred stock		—		—		—			—
Debt securities:
U.S. Government obligations		334.4		4.6		(1.2	)		337.8
Mortgage and asset-backed securities(2)		841.0		31.8		(6.3	)		866.5
States, municipalities and political subdivision bonds		1,058.1		25.4		(15.0	)		1,068.5
Foreign bonds		112.7		2.4		(0.9	)		114.2
Corporate bonds and other		431.9		14.9		(1.4	)		445.4
		2,778.1		79.1		(24.8	)		2,832.4
Short-term investments		264.8		—		—			264.8
	$	4,352.9	$	275.4	$	(30.4	)	$	4,597.9
Industry Segment
AIHL insurance group	$	3,760.3	$	232.7	$	(30.4	)	$	3,962.6
Corporate activities		592.6		42.7		—			635.3
	$	4,352.9	$	275.4	$	(30.4	)	$	4,597.9

(1) Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

(2) Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to RMBS, $190.5 million related to CMBS and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

The amortized cost and estimated fair value of debt securities as of June 30, 2011 by contractual maturity are shown below (in millions). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
Short-term investments due in one year or less	$	262.4	$	262.4
Mortgage and asset-backed securities		971.4		1,006.3
Debt securities
One year or less		241.1		244.2
Over one through five years		540.7		561.6
Over five through ten years		569.7		594.0
Over ten years		383.9		389.1
Equity securities		1,406.5		1,642.1
	$	4,375.7	$	4,699.7

The proceeds from sales of available-for-sale securities were $0.5 billion and $1.1 billion for the six months ended June 30, 2011 and 2010, respectively. The amounts of gross realized capital gains and gross realized capital losses of available-for-sale securities (primarily, equity securities) for the six months ended June 30, 2011 and June 30, 2010 were:

	Six Months Ended June 30,
	2011			2010
	(in millions)
Gross realized gains	$	48.5		$	64.1
Gross realized losses		(7.3	)		(4.3	)
Net realized gains	$	41.2		$	59.8

The gross loss amounts exclude other-than-temporary impairment losses, as discussed below. Realized gains and losses on investments are determined in accordance with the specific identification method.

(c) Other-Than-Temporary Impairment Losses

Alleghany holds it equity and debt securities as available for sale, and as such, these securities are recorded at fair value. Alleghany continually monitors the difference between cost and the estimated fair value of its investments, which involves uncertainty as to whether declines in value are temporary in nature. If a decline in the value of a particular investment is deemed temporary, Alleghany records the decline as an unrealized loss in stockholders’ equity. If the decline is deemed to be other than temporary, Alleghany writes it down to the carrying value of the investment and records an other-than-temporary impairment loss on its statement of earnings, regardless of whether Alleghany continues to hold the applicable security. In addition, under GAAP, any portion of such decline that relates to debt securities that is believed to arise from factors other than credit is recorded as a component of other comprehensive income.

Management’s assessment of a decline in value initially involves an evaluation of all securities that are in an unrealized loss position, regardless of the duration or severity of the loss, as of the applicable balance sheet date. Such initial review consists primarily of assessing whether:

(i) there has been a negative news event with respect to the issuer of any such security (irrespective of the duration or severity of its loss) that could indicate the existence of an other-than-temporary impairment;

(ii) Alleghany has the ability and intent to hold an equity security for a period of time sufficient to allow for an anticipated recovery (generally considered to be less than one year from the balance sheet date); and

(iii) it is more likely than not that Alleghany will sell a debt security before recovery of its amortized cost basis.

To the extent that an equity security in an unrealized loss position is not impaired based on the initial review described above, Alleghany then further evaluates such equity security and deems it to be other-than-temporarily impaired if its decline in fair value has existed for twelve months or more or if its decline in fair value from its cost is greater than 50 percent, absent compelling evidence to the contrary.

Alleghany then evaluates all remaining equity securities that are in an unrealized loss position the cost of which:

(i) exceeds their fair value by 20 percent or more as of the balance sheet date; or

(ii) has exceeded their fair value continuously for six (6) months or more preceding the balance sheet date.

This evaluation takes into account quantitative and qualitative factors in determining whether such securities are other-than-temporarily impaired including:

• market valuation metrics associated with the equity security (e.g., dividend yield and price-to-earnings ratio);

• current views on the equity security, as expressed by either Alleghany’s internal stock analysts and/or by independent stock analysts or rating agencies; and

• discrete credit or news events associated with a specific company, such as negative news releases and rating agency downgrades with respect to the issuer of the investment.

To the extent that a debt security that is in an unrealized loss position is not impaired based on the initial review described above, Alleghany will consider a debt security to be impaired when it believes it to be probable that Alleghany will not be able to collect all amounts due under the security’s contractual terms.

Alleghany may ultimately record a realized loss after having originally concluded that the decline in value was temporary. Risks and uncertainties are inherent in the methodology Alleghany uses to assess other-than-temporary declines in value. Risks and uncertainties could include, but are not limited to, incorrect assumptions about financial condition, liquidity or future prospects, inadequacy of any underlying collateral, and unfavorable changes in economic or social conditions, interest rates or credit ratings.

There were no other-than-temporary impairment losses for the six months ended June 30, 2011. Other-than-temporary impairment losses for the six months ended June 30, 2010 reflect $6.8 million of unrealized losses that were deemed to be other-than-temporary and, as such, were required to be charged against earnings. Of the $6.8 million, $6.5 million of other-than-temporary impairment losses related to equity holdings (primarily in the energy sector), and $0.3 million related to debt security holdings (all of which were deemed to be credit-related). The determination that unrealized losses on such securities were other-than-temporary was primarily based on the severity and duration of the declines in fair value of such securities relative to their cost as of the balance sheet date.

After adjusting the cost basis of securities for the recognition of other-than-temporary impairment losses, the gross unrealized investment losses for debt and equity securities as of June 30, 2011 were deemed to be temporary, based on, among other things:

• the duration of time and the relative magnitude to which fair values of these investments have been below cost was not indicative of an other-than-temporary impairment loss (for example, no equity security was in a continuous unrealized loss position for twelve months or more as of June 30, 2011);

• the absence of compelling evidence that would cause Alleghany to call into question the financial condition or near-term prospects of the issuer of the investment; and

• Alleghany’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery.

Such gross unrealized investment losses and related fair values for debt securities and equity securities as of June 30, 2011 and December 31, 2010, were as follows (in millions):

	2011				2010
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Debt securities:
U.S. Government obligations
Less than 12 months	$	34.7	$	0.4	$	49.7	$	1.2
More than 12 months		—		—		—		—
Mortgage and asset-backed securities
Less than 12 months		102.6		0.9		170.8		2.8
More than 12 months		32.4		3.0		39.5		3.5
States, municipalities and political subdivision bonds
Less than 12 months		197.2		2.6		349.1		14.4
More than 12 months		6.7		0.5		7.7		0.6
Foreign bonds
Less than 12 months		15.7		0.7		45.2		0.9
More than 12 months		—		—		—		—
Corporate bonds and other
Less than 12 months		56.5		1.1		63.1		1.4
More than 12 months		—		—		—		—
Total debt securities
Less than 12 months		406.7		5.7		677.9		20.7
More than 12 months		39.1		3.5		47.2		4.1
Equity securities — Common Stock
Less than 12 months		287.9		16.5		139.5		5.6
More than 12 months		—		—		—		—
Equity securities — Preferred Stock
Less than 12 months		—		—		—		—
More than 12 months		—		—		—		—
Total temporarily impaired securities
Less than 12 months		694.6		22.2		817.4		26.3
More than 12 months		39.1		3.5		47.2		4.1
Total	$	733.7	$	25.7	$	864.6	$	30.4

As of June 30, 2011, Alleghany held a total of 147 debt and equity securities that were in an unrealized loss position, of which 15 securities, all debt securities, were in an unrealized loss position continuously for 12 months or more. Of the debt securities that were in an unrealized loss position, all were mortgage and asset-backed securities, and states, municipalities and political subdivision bonds. As of June 30, 2011, substantially all of Alleghany’s debt securities were rated investment grade. As of June 30, 2011, non-income producing invested assets were insignificant.

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Estimated Fair Value of Financial Instruments (Parenthetical) (Detail) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 1,642,108,000	$ 1,500,686,000
Debt securities	2,795,231,000	2,832,411,000
Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	2,795,200,000	2,832,400,000
Residential Mortgage Backed Securities | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	549,900,000,000	499,900,000
Commercial Mortgage Backed Securities | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	190,500,000,000	173,400,000
Other Asset Backed Securities | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities	265,900,000,000	193,200,000
Partnership Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Excess of fair value over carrying amount	2,400,000
Energy Sector Business | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 1,024,900,000	$ 1,004,800,000

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Estimated Carrying Values and Fair Values of Consolidated Financial Instruments (Detail) (USD $)	Jun. 30, 2011		Dec. 31, 2010
Assets
Investments (excluding equity method investments)	$ 4,726,900,000		$ 4,622,700,000
Liabilities
Senior Notes	298,979,000		298,923,000
Carrying Value
Assets
Investments (excluding equity method investments)	4,726,900,000	[1]	4,622,700,000	[1]
Liabilities
Senior Notes	299,000,000	[2]	298,900,000	[2]
Fair Value
Assets
Investments (excluding equity method investments)	4,726,900,000	[1]	4,622,700,000	[1]
Liabilities
Senior Notes	$ 308,900,000	[2]	$ 291,800,000	[2]

[1] This table includes available-for-sale investments (securities as well as partnership investments carried at fair value that are included in other invested assets). This table excludes investments accounted for using the equity method (Homesite, ORX and other investments) and certain loans receivable that are carried at cost, all of which are included in other invested assets. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is discussed below.

[2] See Note 7 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

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Principles of Financial Statement Presentation - Additional Information (Detail)	Jun. 30, 2011
Homesite
Ownership interest percentage	33.00%
ORX Exploration, Inc
Ownership interest percentage	38.00%

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Earnings Per Share of Common Stock

6 Months Ended

Jun. 30, 2011

Earnings Per Share of Common Stock

3. Earnings Per Share of Common Stock

The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2011 and 2010 (in millions, except share amounts):

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Net earnings	$	15.1		$	66.3		$	86.4		$	124.4
Effect of dilutive securities		(0.1	)		(0.1	)		(0.2	)		(0.5	)
Income available to common stockholders for diluted earnings per share	$	15.0		$	66.2		$	86.2		$	123.9
Weighted average shares outstanding applicable to basic earnings per share		8,916,620			9,124,187			8,921,950			9,164,443
Effect of dilutive securities		5,352			9,788			5,168			9,489
Adjusted weighted average shares outstanding applicable to diluted earnings per share		8,921,972			9,133,975			8,927,118			9,173,932

Contingently issuable shares of 42,429 and 40,756 were potentially available during the first six months of 2011 and 2010, respectively, but were not included in the computations of diluted earnings per share because the impact was anti-dilutive to the earnings per share calculation.

Earnings per share by quarter may not equal the amount for the full year due to the timing of treasury stock purchases and rounding.

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Earnings Per Share of Common Stock (Tables)

6 Months Ended

Jun. 30, 2011

Reconciliation Income and Share Data Used in Basic and Diluted Earnings Per Share Computations

The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2011 and 2010 (in millions, except share amounts):

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Net earnings	$	15.1		$	66.3		$	86.4		$	124.4
Effect of dilutive securities		(0.1	)		(0.1	)		(0.2	)		(0.5	)
Income available to common stockholders for diluted earnings per share	$	15.0		$	66.2		$	86.2		$	123.9
Weighted average shares outstanding applicable to basic earnings per share		8,916,620			9,124,187			8,921,950			9,164,443
Effect of dilutive securities		5,352			9,788			5,168			9,489
Adjusted weighted average shares outstanding applicable to diluted earnings per share		8,921,972			9,133,975			8,927,118			9,173,932

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Earnings Per Share of Common Stock - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share Disclosure [Line Items]
Anti-dilutive securities excluded from the computation of diluted EPS	42,429	40,756

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Segments of Business (Tables)

6 Months Ended

Jun. 30, 2011

Segments of Business

The primary components of “corporate activities” are Alleghany Properties, Alleghany’s investments in Homesite and ORX and strategic investments and other activities at the parent level.

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Revenues:
AIHL insurance group:
Net premiums earned
RSUI	$	144.4		$	146.3		$	286.0		$	296.6
CATA		37.9			41.5			77.1			82.1
PCC		1.6			1.0			1.7			4.9
		183.9			188.8			364.8			383.6
Net investment income		31.0			33.0			61.2			66.3
Net realized capital gains		6.5			32.7			41.2			55.5
Other than temporary impairment losses (1)		—			(5.7	)		—			(6.8	)
Other income		0.1			0.2			0.3			0.3
Total insurance group		221.5			249.0			467.5			498.9
Corporate activities:
Net investment income (2)		(2.4	)		(0.3	)		(1.0	)		(2.2	)
Net realized capital gains		—			0.6			—			4.3
Other than temporary impairment losses		—			—			—			—
Other income		0.1			1.3			0.8			1.3
Total	$	219.2		$	250.6		$	467.3		$	502.3
Earnings before income taxes:
AIHL insurance group:
Underwriting profit (loss) (3)
RSUI	$	19.5		$	43.8		$	68.5		$	80.6
CATA		(1.7	)		2.7			(1.0	)		3.0
PCC		(20.6	)		(5.5	)		(26.9	)		(10.9	)
		(2.8	)		41.0			40.6			72.7
Net investment income		31.0			33.0			61.2			66.3
Net realized capital gains		6.5			32.7			41.2			55.5
Other than temporary impairment losses (1)		—			(5.7	)		—			(6.8	)
Other income, less other expenses		(7.2	)		(7.5	)		(16.9	)		(15.9	)
Total insurance group		27.5			93.5			126.1			171.8
Corporate activities:
Net investment income (2)		(2.4	)		(0.3	)		(1.0	)		(2.2	)
Net realized capital gains		—			0.6			—			4.3
Other than temporary impairment losses		—			—			—			—
Other income		0.1			1.3			0.8			1.3
Corporate administration and other expenses		6.4			6.8			13.2			12.5
Interest expense		4.3			0.1			8.7			0.1
Total	$	14.5		$	88.2		$	104.0		$	162.6

(1) Reflects impairment charges for unrealized losses related to AIHL’s investment portfolio that were deemed to be other-than-temporary. See Note 7(c).

(2) Includes $7.1 million and $1.6 million of Alleghany’s equity share of losses in Homesite for the six months ended June 30, 2011 and 2010, respectively, and $2.2 million and $2.8 million of Alleghany’s equity share of losses in ORX for the six months ended June 30, 2011 and 2010, respectively.

(3) Represents net premiums earned less loss and loss adjustment expenses and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, net realized capital gains, other-than-temporary impairment losses, other income or other expenses. Commissions, brokerage and other underwriting expenses represent commission and brokerage expenses and that portion of salaries, administration and other operating expenses attributable primarily to underwriting activities, whereas the remainder constitutes other expenses.

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Amounts of Gross Realized Capital Gains and Gross Realized Capital Losses of Available-for-Sale Securities (Primarily, Equity Securities) (Detail) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Gain (Loss) on Investments [Line Items]
Gross realized gains	$ 48.5	$ 64.1
Gross realized losses	(7.3)	(4.3)
Net realized gains	$ 41.2	$ 59.8

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Income Taxes

6 Months Ended

Jun. 30, 2011

Income Taxes

8. Income Taxes

As of June 30, 2011, Alleghany believes there were no material uncertain tax positions that would require disclosure under GAAP.

The effective tax rate on earnings before income taxes was 16.9 percent for the first six months of 2011, compared with 23.4 percent for the corresponding 2010 period. The lower effective tax rate in 2011 primarily reflects the impact of higher dividends received deductions and lower pre-tax earnings in the first six months of 2011, partially offset by the absence of a foreign tax benefit which was significant in the 2010 period.

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Principles of Financial Statement Presentation

6 Months Ended

Jun. 30, 2011

Principles of Financial Statement Presentation

1. Principles of Financial Statement Presentation

This report should be read in conjunction with the Annual Report on Form 10-K for the year ended December 31, 2010 (the “2010 10-K”) and the Quarterly Report on Form 10-Q for the quarter ended March 31, 2011 of Alleghany Corporation (“Alleghany”).

Alleghany, a Delaware corporation, which together with its subsidiaries is referred to as “Alleghany” unless the context otherwise requires, is engaged in the property and casualty and surety insurance business through its wholly-owned subsidiary Alleghany Insurance Holdings LLC (“AIHL”). AIHL’s insurance business is conducted through its wholly-owned subsidiaries RSUI Group, Inc. (“RSUI”), Capitol Transamerica Corporation and Platte River Insurance Company (collectively “CATA”), and Pacific Compensation Corporation (“PCC”). AIHL Re LLC (“AIHL Re”), a captive reinsurance subsidiary of AIHL, has in the past provided reinsurance to Alleghany operating units and affiliates. Alleghany’s equity investments, including those held by AIHL’s insurance operating units, are managed primarily by Alleghany Capital Partners LLC, an indirect, wholly-owned subsidiary of Alleghany. Alleghany also owns and manages properties in the Sacramento, California region through its subsidiary Alleghany Properties Holdings LLC (“Alleghany Properties”). In addition, Alleghany owns approximately 33 percent of the outstanding shares of common stock of Homesite Group Incorporated (“Homesite”), a national, full-service, mono-line provider of homeowners insurance, and approximately 38 percent of ORX Exploration, Inc. (“ORX”), a regional oil and gas exploration and production company. Alleghany also makes strategic investments in operating companies and conducts other activities at the parent level.

The financial statements contained in this Quarterly Report on Form 10-Q are unaudited, but reflect all adjustments which, in the opinion of management, are necessary to a fair statement of results of the interim periods covered thereby. All adjustments are of a normal and recurring nature except as described herein.

The accompanying unaudited consolidated financial statements include the results of Alleghany and its wholly-owned and majority-owned subsidiaries, and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). All significant inter-company balances and transactions have been eliminated in consolidation.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those reported results to the extent that those estimates and assumptions prove to be inaccurate.

Certain prior year amounts have been reclassified to conform to the 2011 presentation.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2011

Commitments and Contingencies

4. Commitments and Contingencies

(a) Leases

Alleghany leases certain facilities, furniture and equipment under long-term lease agreements.

(b) Litigation

Alleghany’s subsidiaries are parties to pending litigation and claims in connection with the ordinary course of their businesses. Each such subsidiary makes provisions for estimated losses to be incurred in such litigation and claims, including legal costs. In the opinion of management, such provisions were adequate as of June 30, 2011.

(c) Asbestos and Environmental Impairment Exposure

AIHL’s reserves for unpaid loss and loss adjustment expenses include $13.9 million of gross reserves and $13.8 million of net reserves as of June 30, 2011, and $14.1 million of gross reserves and $14.0 million of net reserves as of December 31, 2010, for asbestos and environmental impairment claims that arose from reinsurance assumed by a subsidiary of CATA between 1969 and 1976. This subsidiary exited such business in 1976. Additional information concerning CATA’s asbestos and environmental exposure can be found in Note 13 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

(d) Indemnification Obligations

On July 14, 2005 (the “Closing Date”), Alleghany completed the sale of its world-wide industrial minerals business, World Minerals, Inc. (“World Minerals”), to Imerys USA, Inc. (the “Purchaser”), a wholly-owned subsidiary of Imerys, S.A., pursuant to a Stock Purchase Agreement, dated as of May 19, 2005, by and among the Purchaser, Imerys, S.A. and Alleghany (the “Stock Purchase Agreement”). Pursuant to the Stock Purchase Agreement, Alleghany undertook certain indemnification obligations, including a general indemnification for breaches of representations and warranties set forth in the Stock Purchase Agreement (the “Contract Indemnification”), and a special indemnification (the “Products Liability Indemnification”) related to products liability claims arising from events that occurred during pre-closing periods, including the period of Alleghany ownership (the “Alleghany Period”). Under the terms of the Stock Purchase Agreement, with respect to products liability claims arising in respect of events occurring during the period prior to Alleghany’s acquisition of World Minerals, Alleghany will provide indemnification at a rate of 100 percent for the first $100.0 million of losses arising from such claims, and at a rate of 50 percent for the next $100.0 million of such losses, so that Alleghany’s maximum indemnification obligation in respect of products liability claims relating to such period of time is $150.0 million. This indemnification obligation will expire on July 31, 2016. With respect to the Alleghany Period, based on its historical experience and other analyses, in July 2005, Alleghany established a $0.6 million reserve in connection with the Products Liability Indemnification for the Alleghany Period. Such reserve was approximately $0.2 million at both June 30, 2011 and December 31, 2010. The Stock Purchase Agreement provides that Alleghany has no responsibility for products liability claims arising in respect of events occurring after the Closing Date, and that any products liability claims involving both pre-closing and post-closing periods will be apportioned on an equitable basis.

Additional information concerning the Products Liability Indemnification and Contract Indemnification can be found in Note 13 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

(e) Equity Holdings Concentration

As of June 30, 2011 and December 31, 2010, Alleghany had a concentration of market risk in its available-for-sale equity securities portfolio with respect to certain energy sector businesses of $1,024.9 million and $1,004.8 million, respectively. Of the $1,024.9 million, $651.0 million represents Alleghany’s ownership of common stock of Exxon Mobil Corporation.

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Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2010	Jun. 30, 2011 Investment	Jun. 30, 2010
Schedule of Available-for-sale Securities [Line Items]
Proceed from sale of available-for-sale securities		$ 541,941	$ 1,078,492
Equity instrument, impairment test description		To the extent that an equity security in an unrealized loss position is not impaired based on the initial review described above, Alleghany then further evaluates such equity security and deems it to be other-than-temporarily impaired if its decline in fair value has existed for twelve months or more or if its decline in fair value from its cost is greater than 50 percent, absent compelling evidence to the contrary. Alleghany then evaluates all remaining equity securities that are in an unrealized loss position the cost of which: (i) exceeds their fair value by 20 percent or more as of the balance sheet date; or (ii) has exceeded their fair value continuously for six (6) months or more preceding the balance sheet date.
Other-than-temporary impairment losses recognized in earnings	5,703		6,780
Number of debt and equity securities in an unrealized loss position		147
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses recognized in earnings			6,500
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses recognized in earnings			$ 300
Number of debt and equity securities in an unrealized loss position		15

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Segments of Business

6 Months Ended

Jun. 30, 2011

Segments of Business

5. Segments of Business

Information related to Alleghany’s reportable segment is shown in the table below. Property and casualty and surety insurance operations are conducted by AIHL through its insurance operating units RSUI, CATA and PCC. In addition, AIHL Re is a wholly-owned subsidiary of AIHL that has in the past provided reinsurance to Alleghany’s insurance operating units and affiliates.

Alleghany’s reportable segment is reported in a manner consistent with the way management evaluates the businesses. As such, insurance underwriting activities are evaluated separately from investment activities. Net realized capital gains and other-than-temporary impairment losses are not considered relevant in evaluating investment performance on an annual basis. Segment accounting policies are described in Note 1 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

The primary components of “corporate activities” are Alleghany Properties, Alleghany’s investments in Homesite and ORX and strategic investments and other activities at the parent level.

	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Revenues:
AIHL insurance group:
Net premiums earned
RSUI	$	144.4		$	146.3		$	286.0		$	296.6
CATA		37.9			41.5			77.1			82.1
PCC		1.6			1.0			1.7			4.9
		183.9			188.8			364.8			383.6
Net investment income		31.0			33.0			61.2			66.3
Net realized capital gains		6.5			32.7			41.2			55.5
Other than temporary impairment losses (1)		—			(5.7	)		—			(6.8	)
Other income		0.1			0.2			0.3			0.3
Total insurance group		221.5			249.0			467.5			498.9
Corporate activities:
Net investment income (2)		(2.4	)		(0.3	)		(1.0	)		(2.2	)
Net realized capital gains		—			0.6			—			4.3
Other than temporary impairment losses		—			—			—			—
Other income		0.1			1.3			0.8			1.3
Total	$	219.2		$	250.6		$	467.3		$	502.3
Earnings before income taxes:
AIHL insurance group:
Underwriting profit (loss) (3)
RSUI	$	19.5		$	43.8		$	68.5		$	80.6
CATA		(1.7	)		2.7			(1.0	)		3.0
PCC		(20.6	)		(5.5	)		(26.9	)		(10.9	)
		(2.8	)		41.0			40.6			72.7
Net investment income		31.0			33.0			61.2			66.3
Net realized capital gains		6.5			32.7			41.2			55.5
Other than temporary impairment losses (1)		—			(5.7	)		—			(6.8	)
Other income, less other expenses		(7.2	)		(7.5	)		(16.9	)		(15.9	)
Total insurance group		27.5			93.5			126.1			171.8
Corporate activities:
Net investment income (2)		(2.4	)		(0.3	)		(1.0	)		(2.2	)
Net realized capital gains		—			0.6			—			4.3
Other than temporary impairment losses		—			—			—			—
Other income		0.1			1.3			0.8			1.3
Corporate administration and other expenses		6.4			6.8			13.2			12.5
Interest expense		4.3			0.1			8.7			0.1
Total	$	14.5		$	88.2		$	104.0		$	162.6

(1) Reflects impairment charges for unrealized losses related to AIHL’s investment portfolio that were deemed to be other-than-temporary. See Note 7(c).

(2) Includes $7.1 million and $1.6 million of Alleghany’s equity share of losses in Homesite for the six months ended June 30, 2011 and 2010, respectively, and $2.2 million and $2.8 million of Alleghany’s equity share of losses in ORX for the six months ended June 30, 2011 and 2010, respectively.

(3) Represents net premiums earned less loss and loss adjustment expenses and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, net realized capital gains, other-than-temporary impairment losses, other income or other expenses. Commissions, brokerage and other underwriting expenses represent commission and brokerage expenses and that portion of salaries, administration and other operating expenses attributable primarily to underwriting activities, whereas the remainder constitutes other expenses.

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Available-for-Sale Securities (Detail) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	$ 4,375.7		$ 4,352.9
Gross unrealized Gains	349.7		275.4
Gross unrealized losses	(25.7)		(30.4)
Fair value	4,699.7		4,597.9
Equity Securities | Common Stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	1,406.5	[1]	1,310.0	[1]
Gross unrealized Gains	252.1	[1]	196.3	[1]
Gross unrealized losses	(16.5)	[1]	(5.6)	[1]
Fair value	1,642.1	[1]	1,500.7	[1]
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	2,706.8		2,778.1
Gross unrealized Gains	97.6		79.1
Gross unrealized losses	(9.2)		(24.8)
Fair value	2,795.2		2,832.4
Debt Securities | Mortgage and Asset Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	971.4	[2]	841.0	[2]
Gross unrealized Gains	38.8	[2]	31.8	[2]
Gross unrealized losses	(3.9)	[2]	(6.3)	[2]
Fair value	1,006.3	[2]	866.5	[2]
Debt Securities | U.S. Government obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	298.4		334.4
Gross unrealized Gains	4.4		4.6
Gross unrealized losses	(0.4)		(1.2)
Fair value	302.4		337.8
Debt Securities | States, municipalities and political subdivision bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	965.9		1,058.1
Gross unrealized Gains	37.8		25.4
Gross unrealized losses	(3.1)		(15.0)
Fair value	1,000.6		1,068.5
Debt Securities | Foreign bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	88.5		112.7
Gross unrealized Gains	2.5		2.4
Gross unrealized losses	(0.7)		(0.9)
Fair value	90.3		114.2
Debt Securities | Corporate bonds and other
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	382.6		431.9
Gross unrealized Gains	14.1		14.9
Gross unrealized losses	(1.1)		(1.4)
Fair value	395.6		445.4
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	262.4		264.8
Fair value	262.4		264.8
Alleghany Insurance Holdings, LLC
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	3,818.5		3,760.3
Gross unrealized Gains	249.0		232.7
Gross unrealized losses	(25.7)		(30.4)
Fair value	4,041.8		3,962.6
Corporate activities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	557.2		592.6
Gross unrealized Gains	100.7		42.7
Fair value	657.9		635.3
Mortgage and Asset Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost	$ 971.4

[1] Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

[2] Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to RMBS, $190.5 million related to CMBS and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

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Gross Unrealized Investment Losses and Related Fair Value for Debt Securities and Equity Securities (Detail) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position, fair value	$ 733.7	$ 864.6
Debt and Equity securities in unrealized loss position, gross losses	25.7	30.4
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position for less than 12 months, fair value	406.7	677.9
Debt and Equity securities in unrealized loss position for more than 12 months, fair value	39.1	47.2
Debt and Equity securities in unrealized loss position for less than 12 months, gross losses	5.7	20.7
Debt and Equity securities in unrealized loss position for more than 12 months, gross losses	3.5	4.1
Debt Securities | Mortgage and Asset Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position for less than 12 months, fair value	102.6	170.8
Debt and Equity securities in unrealized loss position for more than 12 months, fair value	32.4	39.5
Debt and Equity securities in unrealized loss position for less than 12 months, gross losses	0.9	2.8
Debt and Equity securities in unrealized loss position for more than 12 months, gross losses	3.0	3.5
Debt Securities | U.S. Government obligations
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position for less than 12 months, fair value	34.7	49.7
Debt and Equity securities in unrealized loss position for less than 12 months, gross losses	0.4	1.2
Debt Securities | States, municipalities and political subdivision bonds
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position for less than 12 months, fair value	197.2	349.1
Debt and Equity securities in unrealized loss position for more than 12 months, fair value	6.7	7.7
Debt and Equity securities in unrealized loss position for less than 12 months, gross losses	2.6	14.4
Debt and Equity securities in unrealized loss position for more than 12 months, gross losses	0.5	0.6
Debt Securities | Foreign bonds
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position for less than 12 months, fair value	15.7	45.2
Debt and Equity securities in unrealized loss position for less than 12 months, gross losses	0.7	0.9
Debt Securities | Corporate bonds and other
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position for less than 12 months, fair value	56.5	63.1
Debt and Equity securities in unrealized loss position for less than 12 months, gross losses	1.1	1.4
Equity Securities | Common Stock
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position for less than 12 months, fair value	287.9	139.5
Debt and Equity securities in unrealized loss position for less than 12 months, gross losses	16.5	5.6
Impaired Securities
Schedule of Available-for-sale Securities [Line Items]
Debt and Equity securities in unrealized loss position for less than 12 months, fair value	694.6	817.4
Debt and Equity securities in unrealized loss position for more than 12 months, fair value	39.1	47.2
Debt and Equity securities in unrealized loss position for less than 12 months, gross losses	22.2	26.3
Debt and Equity securities in unrealized loss position for more than 12 months, gross losses	$ 3.5	$ 4.1

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Amortized Cost and Estimated Fair Value of Debt securities by Contractual Maturity (Detail) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Short-term investments due in one year or less	$ 262,400,000
Short-term investments due in one year or less	262,400,000
Mortgage and asset-backed securities	1,006,300,000
Debt securities
One year or less	244,200,000
Over one through five years	561,600,000
Over five through ten years	594,000,000
Over ten years	389,100,000
Equity securities	1,642,108,000	1,500,686,000
Fair value	4,699,700,000	4,597,900,000
Available for sale securities, amortized cost	4,375,700,000	4,352,900,000
Debt securities
One year or less	241,100,000
Over one through five years	540,700,000
Over five through ten years	569,700,000
Over ten years	383,900,000
Equity securities	1,406,500,000
Amortized Cost or Cost	4,375,700,000	4,352,900,000
Mortgage and Asset Backed Securities
Debt securities
Available for sale securities, amortized cost	971,400,000
Debt securities
Amortized Cost or Cost	$ 971,400,000

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Reconciliation Income and Share Data Used in Basic and Diluted Earnings Per Share Computations (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share Disclosure [Line Items]
Net earnings	$ 15,082,000	$ 66,271,000	$ 86,422,000	$ 124,440,000
Effect of dilutive securities	(100,000)	(100,000)	(200,000)	(500,000)
Income available to common stockholders for diluted earnings per share	$ 15,000,000	$ 66,200,000	$ 86,200,000	$ 123,900,000
Weighted average shares outstanding applicable to basic earnings per share	8,916,620	9,124,187	8,921,950	9,164,443
Effect of dilutive securities	5,352	9,788	5,168	9,489
Adjusted weighted average shares outstanding applicable to diluted earnings per share	8,921,972	9,133,975	8,927,118	9,173,932

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Reinsurance

6 Months Ended

Jun. 30, 2011

Reinsurance

6. Reinsurance

As discussed in the 2010 10-K, RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program (which covers catastrophe risks including, among others, windstorms and earthquakes) and per risk reinsurance program run on an annual basis from May 1 to the following April 30 and thus expired on April 30, 2011. RSUI renewed all of its catastrophe reinsurance program for the 2011-2012 period, and the new reinsurance program is similar to the expired program. The new reinsurance program provides coverage in two layers for $400.0 million of losses in excess of a $100.0 million net retention after application of the surplus share treaties, facultative reinsurance and per risk covers. The first layer provides coverage for $100.0 million of losses, before a 47.0 percent co-participation by RSUI (compared with a 33.0 percent co-participation under the expired program), in excess of the $100.0 million net retention, and the second layer provides coverage for $300.0 million of losses, before a 5.0 percent co-participation by RSUI, in excess of $200.0 million. In addition, RSUI’s property per risk reinsurance program for the 2011-2012 period provides RSUI with coverage for $90.0 million of losses, before a 10.0 percent co-participation by RSUI, in excess of a $10.0 million net retention per risk after application of the surplus share treaties and facultative reinsurance.

As discussed in Note 5(a) to the Notes to Consolidated Financial Statements set forth in Item 8 of the 2010 10-K, RSUI reinsures its other lines of business through quota share treaties, except for professional liability, binding authority and (effective April 15, 2011) the general liability lines where RSUI retains all of such business. RSUI’s quota share reinsurance treaty for umbrella/excess lines of business renewed on June 1, 2011 on the same terms as the expiring treaty, providing coverage for policies with limits up to $30.0 million, with RSUI ceding 35.0 percent of the premium and loss for policies with limits up to $15.0 million and ceding 67.5 percent of the premium and loss for policies with limits in excess of $15.0 million up to $30.0 million. RSUI’s directors and officers liability line quota share reinsurance treaty renewed on July 1, 2011 on the same terms as the expiring treaty, providing coverage for policies with limits up to $20.0 million, with RSUI ceding 35.0 percent of the premium and loss for policies with limits up to $10.0 million and ceding 60.0 percent of the premium and loss for policies with limits in excess of $10.0 million up to $20.0 million.

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Segments of Business, Revenue (Detail) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Segment Reporting Information [Line Items]
Net premiums earned	$ 183,878		$ 188,809		$ 364,858		$ 383,509
Net investment income	28,545		32,694		60,124		64,123
Net realized capital gains	6,490		33,308		41,182		59,775
Other than temporary impairment losses			(5,703)				(6,780)
Other income	248		1,501		1,133		1,634
Total revenues	219,161		250,609		467,297		502,261
Alleghany Insurance Holdings, LLC
Segment Reporting Information [Line Items]
Net premiums earned	183,900		188,800		364,800		383,600
Net investment income	31,000		33,000		61,200		66,300
Net realized capital gains	6,500		32,700		41,200		55,500
Other than temporary impairment losses			(5,700)	[1]			(6,800)	[1]
Other income	100		200		300		300
Total revenues	221,500		249,000		467,500		498,900
Alleghany Insurance Holdings, LLC | RSUI Group, Inc
Segment Reporting Information [Line Items]
Net premiums earned	144,400		146,300		286,000		296,600
Alleghany Insurance Holdings, LLC | Capitol Transamerica Corporation And Platte River Insurance Company
Segment Reporting Information [Line Items]
Net premiums earned	37,900		41,500		77,100		82,100
Alleghany Insurance Holdings, LLC | Pacific Compensation Corporation
Segment Reporting Information [Line Items]
Net premiums earned	1,600		1,000		1,700		4,900
Corporate activities
Segment Reporting Information [Line Items]
Net investment income	(2,400)	[2]	(300)	[2]	(1,000)	[2]	(2,200)	[2]
Net realized capital gains			600				4,300
Other income	$ 100		$ 1,300		$ 800		$ 1,300

[1] Reflects impairment charges for unrealized losses related to AIHL's investment portfolio that were deemed to be other-than-temporary. See Note 7(c)

[2] Includes $7.1 million and $1.6 million of Alleghany's equity share of losses in Homesite for the six months ended June 30, 2011 and 2010, respectively, and $2.2 million and $2.8 million of Alleghany's equity share of losses in ORX for the six months ended June 30, 2011 and 2010, respectively.

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Available-for-Sale Securities (Parenthetical) (Detail) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 4,699.7		$ 4,597.9
Equity Securities | Common Stock
Schedule of Available-for-sale Securities [Line Items]
Fair value	1,642.1	[1]	1,500.7	[1]
Equity Securities | Common Stock | Energy Sector Business
Schedule of Available-for-sale Securities [Line Items]
Fair value	1,024.9		1,004.8
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Fair value	2,795.2		2,832.4
Residential Mortgage Backed Securities | Debt Securities | Energy Sector Business
Schedule of Available-for-sale Securities [Line Items]
Fair value	549.9		499.9
Commercial Mortgage Backed Securities | Debt Securities | Energy Sector Business
Schedule of Available-for-sale Securities [Line Items]
Fair value	190.5		173.4
Other Asset Backed Securities | Debt Securities | Energy Sector Business
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 265.9		$ 193.2

[1] Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

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Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net earnings	$ 86,422	$ 124,440
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	13,445	18,045
Net realized capital (gains) losses	(41,182)	(59,775)
Other than temporary impairment losses		6,780
(Increase) decrease in other assets	9,227	6,496
(Increase) decrease in reinsurance receivable, net of reinsurance payable	26,447	46,870
(Increase) decrease in premium balances receivable	(67,910)	(37,109)
(Increase) decrease in ceded unearned premium reserves	(18,708)	(7,319)
(Increase) decrease in deferred acquisition costs	(4,433)	(1,382)
Increase (decrease) in other liabilities and current taxes	(33,928)	(28,996)
Increase (decrease) in unearned premiums	64,921	22,703
Increase (decrease) in loss and loss adjustment expenses	(4,356)	(102,047)
Net adjustments	(56,477)	(135,734)
Net cash (used in) provided by operating activities	29,945	(11,294)
Cash flows from investing activities
Purchase of investments	(694,810)	(1,050,830)
Sales of investments	541,941	1,078,492
Maturities of investments	154,709	184,185
Purchases of property and equipment	(4,582)	(3,550)
Net change in short-term investments	2,386	(90,934)
Acquisition of equity method investments		(5,000)
Other, net	(457)	9,759
Net cash (used in) provided by investing activities	(813)	122,122
Cash flows from financing activities
Treasury stock acquisitions	(21,277)	(59,817)
Tax benefit on stock based compensation	645	513
Other, net	243	132
Net cash (used in) provided by financing activities	(20,389)	(59,172)
Net cash increase (decrease) in cash	8,743	51,656
Cash at beginning of period	76,741	32,526
Cash at end of period	85,484	84,182
Cash paid during the period for:
Interest	8,203
Income taxes paid (refunds received)	$ 20,724	$ 46,204

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Segment of Business, Earnings Before Income Taxes (Detail) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Segment Reporting Information [Line Items]
Net investment income	$ 28,545,000		$ 32,694,000		$ 60,124,000		$ 64,123,000
Net realized capital gains	6,490,000		33,308,000		41,182,000		59,775,000
Other than temporary impairment losses			(5,703,000)				(6,780,000)
Other income	248,000		1,501,000		1,133,000		1,634,000
Corporate administration and other expenses	(5,002,000)		(6,324,000)		(11,381,000)		(11,558,000)
Earnings before income taxes	14,467,000		88,187,000		103,976,000		162,552,000
Interest expense	(4,268,000)		(216,000)		(8,720,000)		(435,000)
Alleghany Insurance Holdings, LLC
Segment Reporting Information [Line Items]
Underwriting profit (loss)	(2,800,000)	[1]	41,000,000	[1]	40,600,000	[1]	72,700,000	[1]
Net investment income	31,000,000		33,000,000		61,200,000		66,300,000
Net realized capital gains	6,500,000		32,700,000		41,200,000		55,500,000
Other than temporary impairment losses			(5,700,000)	[2]			(6,800,000)	[2]
Other income	100,000		200,000		300,000		300,000
Other income, less other expenses	(7,200,000)		(7,500,000)		(16,900,000)		(15,900,000)
Earnings before income taxes	27,500,000		93,500,000		126,100,000		171,800,000
Alleghany Insurance Holdings, LLC | RSUI Group, Inc
Segment Reporting Information [Line Items]
Underwriting profit (loss)	19,500,000	[1]	43,800,000	[1]	68,500,000	[1]	80,600,000	[1]
Alleghany Insurance Holdings, LLC | Capitol Transamerica Corporation And Platte River Insurance Company
Segment Reporting Information [Line Items]
Underwriting profit (loss)	(1,700,000)	[1]	2,700,000	[1]	(1,000,000)	[1]	3,000,000	[1]
Alleghany Insurance Holdings, LLC | Pacific Compensation Corporation
Segment Reporting Information [Line Items]
Underwriting profit (loss)	(20,600,000)	[1]	(5,500,000)	[1]	(26,900,000)	[1]	(10,900,000)	[1]
Corporate activities
Segment Reporting Information [Line Items]
Net investment income	(2,400,000)	[3]	(300,000)	[3]	(1,000,000)	[3]	(2,200,000)	[3]
Net realized capital gains			600,000				4,300,000
Other income	100,000		1,300,000		800,000		1,300,000
Corporate administration and other expenses	6,400,000		6,800,000		13,200,000		12,500,000
Interest expense	$ 4,300,000		$ 100,000		$ 8,700,000		$ 100,000

[1] Represents net premiums earned less loss and loss adjustment expenses and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, net realized capital gains, other-than-temporary impairment losses, other income or other expenses. Commissions, brokerage and other underwriting expenses represent commission and brokerage expenses and that portion of salaries, administration and other operating expenses attributable primarily to underwriting activities, whereas the remainder constitutes other expenses.

[2] Reflects impairment charges for unrealized losses related to AIHL's investment portfolio that were deemed to be other-than-temporary. See Note 7(c)

[3] Includes $7.1 million and $1.6 million of Alleghany's equity share of losses in Homesite for the six months ended June 30, 2011 and 2010, respectively, and $2.2 million and $2.8 million of Alleghany's equity share of losses in ORX for the six months ended June 30, 2011 and 2010, respectively.

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Reinsurance - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Description of reinsurance program	As discussed in the 2010 10-K, RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program (which covers catastrophe risks including, among others, windstorms and earthquakes) and per risk reinsurance program run on an annual basis from May 1 to the following April 30 and thus expired on April 30, 2011. RSUI renewed all of its catastrophe reinsurance program for the 2011-2012 period, and the new reinsurance program is similar to the expired program. The new reinsurance program provides coverage in two layers for $400.0 million of losses in excess of a $100.0 million net retention after application of the surplus share treaties, facultative reinsurance and per risk covers. The first layer provides coverage for $100.0 million of losses, before a 47.0 percent co-participation by RSUI (compared with a 33.0 percent co-participation under the expired program), in excess of the $100.0 million net retention, and the second layer provides coverage for $300.0 million of losses, before a 5.0 percent co-participation by RSUI, in excess of $200.0 million. In addition, RSUI’s property per risk reinsurance program for the 2011-2012 period provides RSUI with coverage for $90.0 million of losses, before a 10.0 percent co-participation by RSUI, in excess of a $10.0 million net retention per risk after application of the surplus share treaties and facultative reinsurance. As discussed in Note 5(a) to the Notes to Consolidated Financial Statements set forth in Item 8 of the 2010 10-K, RSUI reinsures its other lines of business through quota share treaties, except for professional liability, binding authority and (effective April 15, 2011) the general liability lines where RSUI retains all of such business. RSUI’s quota share reinsurance treaty for umbrella/excess lines of business renewed on June 1, 2011 on the same terms as the expiring treaty, providing coverage for policies with limits up to $30.0 million, with RSUI ceding 35.0 percent of the premium and loss for policies with limits up to $15.0 million and ceding 67.5 percent of the premium and loss for policies with limits in excess of $15.0 million up to $30.0 million. RSUI’s directors and officers liability line quota share reinsurance treaty renewed on July 1, 2011 on the same terms as the expiring treaty, providing coverage for policies with limits up to $20.0 million, with RSUI ceding 35.0 percent of the premium and loss for policies with limits up to $10.0 million and ceding 60.0 percent of the premium and loss for policies with limits in excess of $10.0 million up to $20.0 million.

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Recent Accounting Standards

6 Months Ended

Jun. 30, 2011

Recent Accounting Standards

2. Recent Accounting Standards

Recently Adopted

In July 2010, the Financial Accounting Standards Board (“FASB”) issued guidance that provides for additional financial statement disclosure regarding financing receivables, including the credit quality and allowance for credit losses associated with such assets. This guidance is generally effective for interim and annual periods beginning after December 15, 2010, with certain disclosures effective for interim and annual periods ending on or after December 31, 2010. Alleghany fully adopted this guidance in the 2011 first quarter, and the implementation did not have any impact on its results of operations and financial condition.

Future Application of Accounting Standards

In June 2011, the FASB issued guidance on the presentation of comprehensive income. This guidance increases the prominence of other comprehensive income in the financial statements and eliminates the current option to report other comprehensive income and its components in the statement of changes in equity, and does not change the items that must be reported in other comprehensive income. This guidance is generally effective for interim and annual periods beginning after December 15, 2011. Alleghany will adopt this guidance in the 2012 first quarter, and Alleghany does not currently believe that the implementation will have an impact on its results of operations and financial condition.

In May 2011, the FASB issued guidance on fair value measurement. This guidance does not extend the use of fair value accounting, but provides clarification of its use within existing GAAP. This guidance also provides for additional financial statement disclosure regarding fair value measurements, particularly those measurements that involve a significant degree of judgment. This guidance is generally effective for interim and annual periods beginning after December 15, 2011. Alleghany will adopt this guidance in the 2012 first quarter, and Alleghany does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

In October 2010, the FASB issued guidance that provides additional clarification for costs associated with acquiring or renewing insurance contracts. This guidance states that only incremental, direct costs associated with the successful acquisition of a new or renewal insurance contract may be capitalized as deferred acquisition costs. Furthermore, such costs: (i) must be essential to the contract transaction; (ii) would not have been incurred had the contract transaction not occurred; and (iii) must be related directly to the acquisition activities involving underwriting, policy issuance and processing, medical and inspection, and sales force contract selling. Advertising costs should be included in deferred acquisition costs only if the capitalization criteria in separate “direct-response” advertising guidance within GAAP are met. All other acquisition-related costs and other expenses should be charged to expense as incurred. This guidance is effective for interim and annual periods beginning after December 15, 2011, with early adoption permitted (but only at the beginning of an entity’s annual reporting period). Alleghany will adopt this guidance in the 2012 first quarter, and Alleghany does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

In May 2010, FASB issued guidance that addresses requirements for measuring fair value. Among other things, the guidance clarifies that the “highest and best use” valuation premise applies only to non-financial assets, and that premiums or discounts should be applied to valuations of an individual asset or liability only when market participants would do so. The guidance also permits measurement of fair value of financial instruments (that are carried at fair value) based on an entity’s net exposure to a particular market or credit risk on a net basis if there is evidence that the entity manages its financial instruments in this way. The guidance provides for additional financial statement disclosure regarding fair value measurements, including disclosure involving transfers between categories within the fair value hierarchy, and quantitative and qualitative information about fair value measurements that involve a significant degree of judgment. This guidance is effective for interim and annual periods ending after December 15, 2011. Alleghany will adopt this guidance in the first quarter of 2012, and Alleghany does not believe the implementation will have a material impact on its results of operations and financial condition.

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Investments (Tables)

6 Months Ended

Jun. 30, 2011

Estimated Carrying Values and Fair Values of Consolidated Financial Instruments

The estimated carrying values and fair values of Alleghany’s consolidated financial instruments as of June 30, 2011 and December 31, 2010 were as follows (in millions):

	June 30, 2011				December 31, 2010
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets
Investments (excluding equity method investments)*	$	4,726.9	$	4,726.9	$	4,622.7	$	4,622.7
Liabilities
Senior Notes**	$	299.0	$	308.9	$	298.9	$	291.8

* This table includes available-for-sale investments (securities as well as partnership investments carried at fair value that are included in other invested assets). This table excludes investments accounted for using the equity method (Homesite, ORX and other investments) and certain loans receivable that are carried at cost, all of which are included in other invested assets. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is discussed below.

** See Note 7 to the Notes to the Consolidated Financial Statements set forth in Item 8 of the 2010 10-K.

Estimated Fair Value of Financial Instruments

The estimated fair values of Alleghany’s financial instruments as of June 30, 2011 and December 31, 2010 allocated among the three levels set forth above were as follows (in millions):

	Level 1		Level 2		Level 3		Total
As of June 30, 2011
Equity securities:
Common stock(1)	$	1,642.1	$	—	$	—	$	1,642.1
Preferred stock		—		—		—		—
Debt securities:
U.S. Government obligations		271.9		30.5		—		302.4
Mortgage and asset-backed securities(2)		—		1,006.3		—		1,006.3
States, municipalities and political subdivision bonds		—		1,000.6		—		1,000.6
Foreign bonds		—		90.3		—		90.3
Corporate bonds and other		—		395.6		—		395.6
		271.9		2,523.3		—		2,795.2
Short-term investments		87.4		175.0		—		262.4
Other invested assets(3)		—		—		27.2		27.2
Investments (excluding equity method investments)	$	2,001.4	$	2,698.3	$	27.2	$	4,726.9
Senior Notes	$	—	$	308.9	$	—	$	308.9
As of December 31, 2010
Equity securities:
Common stock(1)	$	1,500.7	$	—	$	—	$	1,500.7
Preferred stock		—		—		—		—
Debt securities:
U.S. Government obligations		307.3		30.5		—		337.8
Mortgage and asset-backed securities(2)		—		866.5		—		866.5
States, municipalities and political subdivision bonds		—		1,068.5		—		1,068.5
Foreign bonds		—		114.2		—		114.2
Corporate bonds and other		—		445.4		—		445.4
		307.3		2,525.1		—		2,832.4
Short-term investments		86.4		178.4		—		264.8
Other invested assets(3)		—		—		24.8		24.8
Investments (excluding equity method investments)	$	1,894.4	$	2,703.5	$	24.8	$	4,622.7
Senior Notes	$	—	$	291.8	$	—	$	291.8

(1) Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

(2) Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to residential mortgage-backed securities (“RMBS”), $190.5 million related to commercial mortgage-backed securities (“CMBS”) and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

(3) Level 3 securities consist of partnership investments. The carrying value of partnership investments of $27.2 million increased by $2.4 million from the December 31, 2010 carrying value of $24.8 million, due primarily to an increase in estimated fair value during the period.

Available-for-Sale Securities

Available-for-sale securities as of June 30, 2011 and December 31, 2010 are summarized as follows (in millions):

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
As of June 30, 2011
Equity securities:
Common stock(1)	$	1,406.5	$	252.1	$	(16.5	)	$	1,642.1
Preferred stock		—		—		—			—
Debt securities:
U.S. Government obligations		298.4		4.4		(0.4	)		302.4
Mortgage and asset-backed securities(2)		971.4		38.8		(3.9	)		1,006.3
States, municipalities and political subdivision bonds		965.9		37.8		(3.1	)		1,000.6
Foreign bonds		88.5		2.5		(0.7	)		90.3
Corporate bonds and other		382.6		14.1		(1.1	)		395.6
		2,706.8		97.6		(9.2	)		2,795.2
Short-term investments		262.4		—		—			262.4
	$	4,375.7	$	349.7	$	(25.7	)	$	4,699.7
Industry Segment
AIHL insurance group	$	3,818.5	$	249.0	$	(25.7	)	$	4,041.8
Corporate activities		557.2		100.7		—			657.9
	$	4,375.7	$	349.7	$	(25.7	)	$	4,699.7

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
As of December 31, 2010
Equity securities:
Common stock(1)	$	1,310.0	$	196.3	$	(5.6	)	$	1,500.7
Preferred stock		—		—		—			—
Debt securities:
U.S. Government obligations		334.4		4.6		(1.2	)		337.8
Mortgage and asset-backed securities(2)		841.0		31.8		(6.3	)		866.5
States, municipalities and political subdivision bonds		1,058.1		25.4		(15.0	)		1,068.5
Foreign bonds		112.7		2.4		(0.9	)		114.2
Corporate bonds and other		431.9		14.9		(1.4	)		445.4
		2,778.1		79.1		(24.8	)		2,832.4
Short-term investments		264.8		—		—			264.8
	$	4,352.9	$	275.4	$	(30.4	)	$	4,597.9
Industry Segment
AIHL insurance group	$	3,760.3	$	232.7	$	(30.4	)	$	3,962.6
Corporate activities		592.6		42.7		—			635.3
	$	4,352.9	$	275.4	$	(30.4	)	$	4,597.9

(1) Of the $1,642.1 million of fair value as of June 30, 2011, $1,024.9 million related to certain energy sector businesses. Of the $1,500.7 million of fair value as of December 31, 2010, $1,004.8 million related to certain energy sector businesses.

(2) Of the $1,006.3 million of fair value as of June 30, 2011, $549.9 million related to RMBS, $190.5 million related to CMBS and $265.9 million related to other asset-backed securities. Of the $866.5 million of fair value as of December 31, 2010, $499.9 million related to RMBS, $173.4 million related to CMBS and $193.2 million related to other asset-backed securities.

Amortized Cost and Estimated Fair Value of Debt securities by Contractual Maturity

The amortized cost and estimated fair value of debt securities as of June 30, 2011 by contractual maturity are shown below (in millions). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
Short-term investments due in one year or less	$	262.4	$	262.4
Mortgage and asset-backed securities		971.4		1,006.3
Debt securities
One year or less		241.1		244.2
Over one through five years		540.7		561.6
Over five through ten years		569.7		594.0
Over ten years		383.9		389.1
Equity securities		1,406.5		1,642.1
	$	4,375.7	$	4,699.7

Amounts of Gross Realized Capital Gains and Gross Realized Capital Losses of Available-for-Sale Securities (Primarily, Equity Securities)

The amounts of gross realized capital gains and gross realized capital losses of available-for-sale securities (primarily, equity securities) for the six months ended June 30, 2011 and June 30, 2010 were:

	Six Months Ended June 30,
	2011			2010
	(in millions)
Gross realized gains	$	48.5		$	64.1
Gross realized losses		(7.3	)		(4.3	)
Net realized gains	$	41.2		$	59.8

Gross Unrealized Investment Losses and Related Fair Value for Debt Securities and Equity Securities

Such gross unrealized investment losses and related fair values for debt securities and equity securities as of June 30, 2011 and December 31, 2010, were as follows (in millions):

	2011				2010
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Debt securities:
U.S. Government obligations
Less than 12 months	$	34.7	$	0.4	$	49.7	$	1.2
More than 12 months		—		—		—		—
Mortgage and asset-backed securities
Less than 12 months		102.6		0.9		170.8		2.8
More than 12 months		32.4		3.0		39.5		3.5
States, municipalities and political subdivision bonds
Less than 12 months		197.2		2.6		349.1		14.4
More than 12 months		6.7		0.5		7.7		0.6
Foreign bonds
Less than 12 months		15.7		0.7		45.2		0.9
More than 12 months		—		—		—		—
Corporate bonds and other
Less than 12 months		56.5		1.1		63.1		1.4
More than 12 months		—		—		—		—
Total debt securities
Less than 12 months		406.7		5.7		677.9		20.7
More than 12 months		39.1		3.5		47.2		4.1
Equity securities — Common Stock
Less than 12 months		287.9		16.5		139.5		5.6
More than 12 months		—		—		—		—
Equity securities — Preferred Stock
Less than 12 months		—		—		—		—
More than 12 months		—		—		—		—
Total temporarily impaired securities
Less than 12 months		694.6		22.2		817.4		26.3
More than 12 months		39.1		3.5		47.2		4.1
Total	$	733.7	$	25.7	$	864.6	$	30.4

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Income Taxes - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Income Taxes [Line Items]
Effective income tax rate	16.90%	23.40%

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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jul. 31, 2005
Loss Contingencies [Line Items]
Reserves for unpaid loss and loss adjustment expenses, gross	$ 13.9	$ 14.1
Reserves for unpaid loss and loss adjustment expenses, net	13.8	14.0
Indemnification obligation	150
Indemnification obligation terms	Under the terms of the Stock Purchase Agreement, with respect to products liability claims arising in respect of events occurring during the period prior to Alleghany’s acquisition of World Minerals, Alleghany will provide indemnification at a rate of 100 percent for the first $100.0 million of losses arising from and at a rate of 50 percent for the next $100.0 million of such losses, so that Alleghany’s maximum indemnification obligation in respect of products liability claims relating to such period of time is $150.0 million.
Reserve for Products Liability Indemnification	0.2	0.2	0.6
Concentration of market risk related to available-for-sale equity securities portfolio	1,024.9	1,004.8
Exxon Mobil Corporation
Loss Contingencies [Line Items]
Concentration of market risk related to available-for-sale equity securities portfolio	$ 651.0
Claims Related to Events Before Acquisition | First $100 Million Of Losses
Loss Contingencies [Line Items]
Indemnification percentage	100.00%
Claims Related to Events Before Acquisition | For the Next $100 Million of Losses
Loss Contingencies [Line Items]
Indemnification percentage	50.00%

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Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Available-for-sale securities at fair value:
Equity securities (cost: 2011 - $1,406,542; 2010 - $1,310,009)	$ 1,642,108	$ 1,500,686
Debt securities (amortized cost: 2011 - $2,706,761; 2010 - $2,778,117)	2,795,231	2,832,411
Short-term investments	262,445	264,811
Marketable Securities, Total	4,699,784	4,597,908
Other invested assets	198,878	207,294
Total investments	4,898,662	4,805,202
Cash	85,484	76,741
Premium balances receivable	195,985	128,075
Reinsurance recoverables	872,589	873,295
Ceded unearned premium reserves	162,773	144,065
Deferred acquisition costs	72,125	67,692
Property and equipment at cost, net of accumulated depreciation and amortization	20,269	19,504
Goodwill and other intangibles, net of amortization	140,635	142,312
Current taxes receivable	12,529
Net deferred tax assets	37,196	77,147
Other assets	117,620	97,666
Total assets	6,615,867	6,431,699
Liabilities and Stockholders' Equity
Loss and loss adjustment expenses	2,324,386	2,328,742
Unearned premiums	588,848	523,927
Senior Notes	298,979	298,923
Reinsurance payable	67,241	41,500
Current taxes payable		3,220
Other liabilities	306,964	326,519
Total liabilities	3,586,418	3,522,831
Common stock (shares authorized: 2011 and 2010 - 22,000,000; issued and outstanding 2011 - 9,117,787; 2010 - 9,300,448)	9,117	9,118
Contributed capital	937,057	928,816
Accumulated other comprehensive income	218,149	170,262
Treasury stock, at cost (2011 - 232,914 shares; 2010 - 351,532 shares)	(68,271)	(99,686)
Retained earnings	1,933,397	1,900,358
Total stockholders' equity	3,029,449	2,908,868
Liabilities and Equity, Total	$ 6,615,867	$ 6,431,699