10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(MARK ONE)

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

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2018

OR

☐ 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.

1411 BROADWAY, 34TH FLOOR, NY, NY 10018

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  ☒    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  ☒    NO  ☐

INDICATE BY CHECK MARK WHETHER THE REGISTRANT IS A LARGE ACCELERATED FILER, AN ACCELERATED FILER, A NON-ACCELERATED FILER, A SMALLER REPORTING COMPANY, OR AN EMERGING GROWTH COMPANY. SEE THE DEFINITIONS OF “LARGE ACCELERATED FILER,” “ACCELERATED FILER,” “SMALLER REPORTING COMPANY,” AND “EMERGING GROWTH COMPANY” IN RULE 12b-2 OF THE EXCHANGE ACT.

LARGE ACCELERATED FILER	☒	ACCELERATED FILER	☐	EMERGING GROWTH COMPANY	☐
NON-ACCELERATED FILER	☐	SMALLER REPORTING COMPANY	☐

IF AN EMERGING GROWTH COMPANY, INDICATE BY CHECK MARK IF THE REGISTRANT HAS ELECTED NOT TO USE THE EXTENDED TRANSITION PERIOD FOR COMPLYING WITH ANY NEW OR REVISED FINANCIAL ACCOUNTING STANDARDS PROVIDED PURSUANT TO SECTION 13(A) OF THE EXCHANGE ACT.  ☐

INDICATE BY CHECK MARK WHETHER THE REGISRANT IS A SHELL COMPANY (AS DEFINED IN RULE 12b-2 OF THE ACT).    YES ☐    NO ☒

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

14,936,675 SHARES, PAR VALUE $1.00 PER SHARE, AS OF JULY 26, 2018

ALLEGHANY CORPORATION

TABLE OF CONTENTS

		Page
PART I
ITEM 1.	Financial Statements		1
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		25
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk		67
ITEM 4.	Controls and Procedures		68
PART II
ITEM 1.	Legal Proceedings		69
ITEM 1A.	Risk Factors		69
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds		69
ITEM 6.	Exhibits		70
SIGNATURES			71

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements.

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Balance Sheets

	June 30, 2018			December 31, 2017
	(unaudited)
	($ in thousands, except share amounts)
Assets
Investments:
Securities at fair value:
Equity securities (cost: 2018 – $3,705,364; 2017 – $3,170,673)	$	4,714,079		$	4,099,467
Debt securities (amortized cost: 2018 – $12,206,035; 2017 – $12,536,772)		12,155,866			12,721,399
Short-term investments		472,830			578,054
		17,342,775			17,398,920
Commercial mortgage loans		695,772			658,364
Other invested assets		605,477			743,358
Total investments		18,644,024			18,800,642
Cash		623,223			838,375
Accrued investment income		97,347			105,877
Premium balances receivable		831,989			797,346
Reinsurance recoverables		1,602,600			1,746,488
Ceded unearned premiums		208,534			190,252
Deferred acquisition costs		468,243			453,346
Property and equipment at cost, net of accumulated depreciation and amortization		197,678			125,337
Goodwill		346,270			334,905
Intangible assets, net of amortization		463,544			459,037
Current taxes receivable		68,396			31,085
Net deferred tax assets		61,806			136,489
Funds held under reinsurance agreements		719,360			706,042
Other assets		752,873			659,096
Total assets	$	25,085,887		$	25,384,317
Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity
Loss and loss adjustment expenses	$	11,515,493		$	11,871,250
Unearned premiums		2,279,810			2,182,294
Senior Notes and other debt		1,569,367			1,484,897
Reinsurance payable		159,944			156,376
Other liabilities		1,021,512			1,068,907
Total liabilities		16,546,126			16,763,724
Redeemable noncontrolling interests		135,372			106,530
Common stock (shares authorized: 2018 and 2017 – 22,000,000; shares issued: 2018 and 2017 – 17,459,961)		17,460			17,460
Contributed capital		3,612,615			3,612,109
Accumulated other comprehensive (loss) income		(172,307	)		618,118
Treasury stock, at cost (2018 – 2,465,282 shares; 2017 – 2,069,461 shares)		(1,057,885	)		(824,906	)
Retained earnings		6,004,506			5,091,282
Total stockholders’ equity attributable to Alleghany stockholders		8,404,389			8,514,063
Total liabilities, redeemable noncontrolling interest and stockholders’ equity	$	25,085,887		$	25,384,317

See accompanying Notes to Unaudited Consolidated Financial Statements.

1

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Earnings and Comprehensive Income

(unaudited)

	Three Months Ended June 30,
	2018			2017
	($ in thousands, except per share amounts)
Revenues
Net premiums earned	$	1,236,959		$	1,243,929
Net investment income		126,273			101,656
Change in the fair value of equity securities		185,245			-
Net realized capital gains		6,462			9,268
Other than temporary impairment losses		-			(3,747	)
Noninsurance revenue		342,725			202,812
Total revenues		1,897,664			1,553,918
Costs and Expenses
Net loss and loss adjustment expenses		738,210			734,886
Commissions, brokerage and other underwriting expenses		402,083			413,737
Other operating expenses		343,165			225,170
Corporate administration		14,119			14,405
Amortization of intangible assets		5,966			4,611
Interest expense		22,277			20,989
Total costs and expenses		1,525,820			1,413,798
Earnings before income taxes		371,844			140,120
Income taxes		73,440			37,461
Net earnings		298,404			102,659
Net earnings attributable to noncontrolling interest		3,288			848
Net earnings attributable to Alleghany stockholders	$	295,116		$	101,811
Net earnings	$	298,404		$	102,659
Other comprehensive income:
Change in unrealized gains (losses), net of deferred taxes of ($8,853) and $76,300 for 2018 and 2017, respectively		(33,305	)		141,701
Less: reclassification for net realized capital gains and other than temporary impairments, net of taxes of ($1,357) and ($1,932) for 2018 and 2017, respectively		(5,105	)		(3,589	)
Change in unrealized currency translation adjustment, net of deferred  taxes of ($2,797) and $5,364 for 2018 and 2017, respectively		(10,523	)		9,962
Retirement plans		209			98
Comprehensive income		249,680			250,831
Comprehensive income attributable to noncontrolling interests		3,288			848
Comprehensive income attributable to Alleghany stockholders	$	246,392		$	249,983
Basic earnings per share attributable to Alleghany stockholders	$	19.44		$	6.60
Diluted earnings per share attributable to Alleghany stockholders		19.44			6.60

See accompanying Notes to Unaudited Consolidated Financial Statements.

2

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Earnings and Comprehensive Income

(unaudited)

	Six Months Ended June 30,
	2018			2017
	($ in thousands, except per share amounts)
Revenues
Net premiums earned	$	2,444,815		$	2,453,117
Net investment income		250,399			217,194
Change in the fair value of equity securities		142,596			—
Net realized capital gains		50,967			68,919
Other than temporary impairment losses		(511	)		(6,964	)
Noninsurance revenue		594,352			354,104
Total revenues		3,482,618			3,086,370
Costs and Expenses
Net loss and loss adjustment expenses		1,408,788			1,434,191
Commissions, brokerage and other underwriting expenses		808,378			822,252
Other operating expenses		608,062			400,308
Corporate administration		21,904			31,290
Amortization of intangible assets		11,230			8,375
Interest expense		43,808			41,924
Total costs and expenses		2,902,170			2,738,340
Earnings before income taxes		580,448			348,030
Income taxes		110,862			96,011
Net earnings		469,586			252,019
Net earnings attributable to noncontrolling interest		2,895			1,032
Net earnings attributable to Alleghany stockholders	$	466,691		$	250,987
Net earnings	$	469,586		$	252,019
Other comprehensive income:
Change in unrealized gains (losses), net of deferred taxes of ($47,758) and $143,570 for 2018 and 2017, respectively		(179,663	)		266,630
Less: reclassification for net realized capital gains and other than temporary impairments, net of taxes of ($991) and ($21,684) for 2018 and 2017, respectively		(3,726	)		(40,271	)
Change in unrealized currency translation adjustment, net of deferred taxes of ($1,442) and $8,083 for 2018 and 2017, respectively		(5,423	)		15,011
Retirement plans		(1,113	)		(297	)
Comprehensive income		279,661			493,092
Comprehensive income attributable to noncontrolling interests		2,895			1,032
Comprehensive income attributable to Alleghany stockholders	$	276,766		$	492,060
Basic earnings per share attributable to Alleghany stockholders	$	30.53		$	16.28
Diluted earnings per share attributable to Alleghany stockholders		30.52			16.27

See accompanying Notes to Unaudited Consolidated Financial Statements.

3

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Cash Flows

(unaudited)

	Six Months Ended June 30,
	2018			2017
	($ in thousands)
Cash flows from operating activities
Net earnings	$	469,586		$	252,019
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization		64,510			69,723
Change in the fair value of equity securities		(142,596	)		-
Net realized capital (gains) losses		(50,967	)		(68,919	)
Other than temporary impairment losses		511			6,964
(Increase) decrease in reinsurance recoverables, net of reinsurance payable		147,456			109,287
(Increase) decrease in premium balances receivable		(34,643	)		(109,073	)
(Increase) decrease in ceded unearned premiums		(18,282	)		4,057
(Increase) decrease in deferred acquisition costs		(14,897	)		(20,683	)
(Increase) decrease in funds held under reinsurance agreements		(13,318	)		(50,281	)
Increase (decrease) in unearned premiums		97,516			78,592
Increase (decrease) in loss and loss adjustment expenses		(355,757	)		(26,960	)
Change in unrealized foreign currency exchange rate losses (gains)		48,228			(86,834	)
Other, net		(48,172	)		45,989
Net adjustments		(320,411	)		(48,138	)
Net cash provided by (used in) operating activities		149,175			203,881
Cash flows from investing activities
Purchases of debt securities		(2,301,614	)		(3,313,484	)
Purchases of equity securities		(533,842	)		(1,849,990	)
Sales of debt securities		1,667,526			2,193,147
Maturities and redemptions of debt securities		886,970			907,309
Sales of equity securities		269,567			1,972,117
Net (purchases) sales of short-term investments		104,728			73,725
Net (purchases) sales and maturities of commercial mortgage loans		(37,408	)		(41,659	)
(Purchases) sales of property and equipment		(13,164	)		16,006
Purchases of affiliates and subsidiaries, net of cash acquired		(108,386	)		(164,528	)
Other, net		50,415			84,585
Net cash provided by (used in) investing activities		(15,208	)		(122,772	)
Cash flows from financing activities
Treasury stock acquisitions		(236,103	)		-
Increase (decrease) in other debt		38,452			(26,098	)
Cash dividends paid		(153,967	)		-
Other, net		5,317			(15,238	)
Net cash provided by (used in) financing activities		(346,301	)		(41,336	)
Effect of foreign currency exchange rate changes on cash		(2,818	)		9,821
Net increase (decrease) in cash		(215,152	)		49,594
Cash at beginning of period		838,375			594,091
Cash at end of period	$	623,223		$	643,685
Supplemental disclosures of cash flow information
Cash paid during period for:
Interest paid	$	42,562		$	41,207
Income taxes paid (refund received)		22,135			31,242

See accompanying Notes to Unaudited Consolidated Financial Statements.

4

ALLEGHANY CORPORATION AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

1. Summary of Significant Accounting Principles

(a) Principles of Financial Statement Presentation

This Quarterly Report on Form 10-Q (this “Form 10-Q”) should be read in conjunction with the Annual Report on Form 10-K for the year ended December 31, 2017 (the “2017 Form 10-K”) and the Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 of Alleghany Corporation (“Alleghany”).

Alleghany Corporation, a Delaware corporation, owns and manages certain operating subsidiaries and investments, anchored by a core position in property and casualty reinsurance and insurance. Through its wholly-owned subsidiary Transatlantic Holdings, Inc. (“TransRe”), Alleghany is engaged in the property and casualty reinsurance business. TransRe has been a subsidiary of Alleghany since March 2012. Through its wholly-owned subsidiary Alleghany Insurance Holdings LLC (“AIHL”) and its subsidiaries, Alleghany is engaged in the property and casualty insurance business. AIHL’s insurance operations are principally conducted by its subsidiaries RSUI Group, Inc. (“RSUI”) and CapSpecialty, Inc. (“CapSpecialty”). RSUI has been a subsidiary of AIHL since July 2003 and CapSpecialty has been a subsidiary of AIHL since January 2002. AIHL Re LLC (“AIHL Re”), a captive reinsurance company which provides reinsurance to Alleghany’s current and former insurance operating subsidiaries and affiliates, has been a subsidiary of Alleghany since its formation in May 2006.

Prior to December 31, 2017, AIHL’s insurance operations also included Pacific Compensation Corporation (“PacificComp”). On September 12, 2017, AIHL signed a definitive agreement to sell PacificComp to CopperPoint Mutual Insurance Company (“CopperPoint”) for total cash consideration of approximately $158 million. The transaction closed on December 31, 2017, at which time: (i) approximately $442 million of PacificComp assets, consisting primarily of debt securities, and approximately $316 million of PacificComp liabilities, consisting primarily of loss and loss adjustment expenses (“LAE”) reserves, were transferred to CopperPoint; and (ii) AIHL recorded an after-tax gain of approximately $16 million, which included a tax benefit. In connection with the transaction, AIHL Re will continue to provide adverse development reinsurance coverage on PacificComp’s pre-acquisition claims, subject to certain terms and conditions. AIHL Re’s obligations, which are guaranteed by Alleghany, are subject to: (i) an aggregate limit of $150.0 million; and (ii) a final commutation and settlement as of December 31, 2024.

Although Alleghany’s primary sources of revenues and earnings are its reinsurance and insurance operations and investments, Alleghany also sources, executes, manages and monitors certain private investments primarily through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s investments include:

• Bourn & Koch, Inc. (“Bourn & Koch”), a manufacturer/remanufacturer of specialty machine tools and supplier of replacement parts, accessories and services for a variety of cutting technologies, headquartered in Rockford, Illinois;

• R.C. Tway Company, LLC (“Kentucky Trailer”), a manufacturer of custom trailers and truck bodies for the moving and storage industry and other markets, headquartered in Louisville, Kentucky;

• IPS-Integrated Project Services, LLC (“IPS”), a technical service provider focused on the global pharmaceutical and biotechnology industries, headquartered in Blue Bell, Pennsylvania;

• Jazwares, LLC (together with its affiliates, “Jazwares”), a global toy, entertainment and musical instrument company, headquartered in Sunrise, Florida;

• WWSC Holdings, LLC (“W&W|AFCO Steel”), a structural steel fabricator and erector, headquartered in Oklahoma City, Oklahoma; and

• a 45 percent equity interest in Wilbert Funeral Services, Inc. (“Wilbert”), a provider of products and services for the funeral and cemetery industries and precast concrete markets, headquartered in Overland Park, Kansas.

The results of W&W|AFCO Steel have been included in Alleghany’s consolidated results beginning with its acquisition by Alleghany Capital on April 28, 2017. On February 7, 2018, W&W|AFCO Steel acquired Hirschfeld Holdings, LP (“Hirschfeld”).

Wilbert is accounted for under the equity method of accounting and is included in other invested assets. The results of Wilbert have been included in Alleghany’s consolidated results beginning with its acquisition by Alleghany Capital on August 1, 2017.

In addition, Alleghany owns certain other holding-company investments. Alleghany’s wholly-owned subsidiary, Stranded Oil Resources Corporation (“SORC”) is an exploration and production company focused on enhanced oil recovery, headquartered in Golden, Colorado. Alleghany’s wholly-owned subsidiary, Alleghany Properties Holdings LLC (“Alleghany Properties”), owns and manages certain properties in the Sacramento, California region. Alleghany’s public equity investments are managed primarily through Alleghany’s wholly-owned subsidiary Roundwood Asset Management LLC.

5

Unless the context otherwise requires, references to “Alleghany” include Alleghany together with its subsidiaries.

The accompanying 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 U.S. (“GAAP”). All material inter-company balances and transactions have been eliminated in consolidation.

The portion of stockholders’ equity, net earnings and comprehensive income that is not attributable to Alleghany stockholders is presented on the Consolidated Balance Sheets and the Consolidated Statements of Earnings and Comprehensive Income as noncontrolling interests. Because all noncontrolling interests have the option to sell their ownership interests to Alleghany in the future (generally through 2024), the portion of stockholders’ equity that is not attributable to Alleghany stockholders is presented on the Consolidated Balance Sheets as redeemable noncontrolling interests for all periods presented. During the first six months of 2018, the noncontrolling interests outstanding were approximately as follows: Bourn & Koch - 11 percent; Kentucky Trailer - 21 percent; IPS - 16 percent; Jazwares - 23 percent; and W&W|AFCO Steel - 20 percent.

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 as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Alleghany relies on historical experience and on various other assumptions that it believes to be reasonable under the circumstances to make judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from those reported results to the extent that those estimates and assumptions prove to be inaccurate. Changes in estimates are reflected in the Consolidated Statements of Earnings and Comprehensive Income in the period in which the changes are made.

(b) Other Significant Accounting Principles

Alleghany’s significant accounting principles can be found in Note 1 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

(c) Recent Accounting Standards

Recently Adopted

In February 2018, the Financial Accounting Standards Board (the “FASB”) issued guidance on certain tax effects caused by the Tax Cuts and Jobs Act of 2017 (the “Tax Act”), which was signed into law on December 22, 2017. The Tax Act, among other things, reduced the U.S. corporate federal income tax rate from 35.0 percent to 21.0 percent, effective January 1, 2018 for the 2018 tax year. Under such circumstances, GAAP requires that the value of deferred tax assets and liabilities be reduced through tax expense. The new guidance provides an option to reclassify any stranded tax amounts that remain in accumulated other comprehensive income to retained earnings, either retrospectively or at the beginning of the period in which the adoption is elected. This guidance became effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany adopted this new guidance in the first quarter of 2018 and has elected to reclassify stranded tax amounts that remain in accumulated other comprehensive income, in the amount of approximately $135 million, to retained earnings as of January 1, 2018. See Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income, and see Note 9 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the Tax Act and its impact on Alleghany.

In March 2017, the FASB issued guidance that reduces the amortization period for the premium on certain purchased callable debt securities to the earliest call date. The guidance applies specifically to noncontingent call features that are callable at a predetermined and fixed price and date. The accounting for purchased callable debt securities held at a discount is not affected. This guidance is effective in the first quarter of 2019 for public entities with early adoption permitted. Alleghany adopted this guidance in the fourth quarter of 2017 and recorded a cumulative effect reduction of approximately $13 million directly to opening 2017 retained earnings and an offsetting increase in opening 2017 accumulated other comprehensive income. The implementation did not have a material impact on Alleghany’s results of operations and financial condition. See Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income.

In May 2014, the FASB, together with the International Accounting Standards Board, issued guidance on the recognition of revenue from contracts with customers. Under this guidance, revenue is recognized as the transfer of goods and services to customers takes place and in amounts that reflect the payment or payments that are expected to be received from the customers for those goods and services. This guidance also requires new disclosures about revenue. Revenues related to insurance and reinsurance contracts and revenues from investments are not impacted by this guidance, whereas noninsurance revenues arising from the sale of manufactured goods and services is generally included within the scope of this guidance. This guidance, and all related amendments, became effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany adopted this guidance in the first quarter of 2018 using the modified retrospective transition approach and the implementation did not have a material impact on its results of operations and financial condition. See Note 10 of this Form 10-Q for further information on Alleghany’s noninsurance revenues.

6

In January 2016, the FASB issued guidance that changes the recognition and measurement of certain financial instruments. This guidance requires investments in equity securities (except those accounted for under the equity method of accounting, but including partnership investments not accounted for under the equity method) to be measured at fair value with changes in fair value recognized in net earnings. For equity securities that do not have readily determinable fair values, measurement may be at cost, adjusted for any impairment and changes resulting from observable price changes for a similar investment of the same issuer. This guidance also changes the presentation and disclosure of financial instruments by: (i) requiring that financial instrument disclosures of fair value use the exit price notion; (ii) requiring separate presentation of financial assets and financial liabilities by measurement category and form, either on the balance sheet or the accompanying notes to the financial statements; (iii) requiring separate presentation in other comprehensive income for the portion of the change in a liability’s fair value resulting from instrument-specific credit risk when an election has been made to measure the liability at fair value; and (iv) eliminating the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost on the balance sheet. This guidance is effective for fiscal years beginning after December 15, 2017 for public entities, including interim periods within those fiscal years. Except for the change in presentation for instrument-specific credit risk, this guidance does not permit early adoption. Alleghany adopted this guidance in the first quarter of 2018. As of January 1, 2018, approximately $736 million of net unrealized gains of equity securities, net of deferred taxes, were reclassified from accumulated other comprehensive income to retained earnings. Subsequently, all changes in unrealized gains or losses of equity securities, net of deferred taxes, were presented in the Consolidated Statements of Earnings rather than the Consolidated Statements of Comprehensive Income, under the caption “change in the fair value of equity securities.” Results arising from partnership investments, whether accounted for under the equity method or at fair value, continue to be reported as a component of net investment income. The implementation did not have a material impact on Alleghany’s financial condition. See Note 3 of this Form 10-Q for further information on Alleghany’s equity securities, and Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income.

Future Application of Accounting Standards

In February 2016, the FASB issued guidance on leases. Under this guidance, a lessee is required to recognize lease liabilities and corresponding right-of-use assets for leases with terms of more than one year, whereas under current guidance, a lessee is only required to recognize assets and liabilities for those leases qualifying as capital leases. This guidance also requires new disclosures about the amount, timing and uncertainty of cash flows arising from leases. The accounting by lessors is to remain largely unchanged. This guidance is effective in the first quarter of 2019 for public entities, with early adoption permitted. A modified retrospective transition approach is required for all leases in existence as of, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Alleghany will adopt this guidance in the first quarter of 2019 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition. See Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for further information on Alleghany’s leases.

In June 2016, the FASB issued guidance on credit losses. Under this guidance, a company is required to measure all expected credit losses on loans, reinsurance recoverables and other financial assets accounted for at cost or amortized cost, as applicable. Estimates of expected credit losses are to be based on historical experience, current conditions and reasonable and supportable forecasts. Credit losses for securities accounted for on an available-for-sale (“AFS”) basis are to be measured in a manner similar to GAAP as currently applied and cannot exceed the amount by which the fair value is less than the amortized cost. Credit losses for all financial assets are to be recorded through an allowance for credit losses. Subsequent reversals in credit loss estimates are permitted and are to be recognized in earnings. This guidance also requires new disclosures about the significant estimates and judgments used in estimating credit losses, as well as the credit quality of financial assets. This guidance is effective in the first quarter of 2020 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2020 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

In January 2017, the FASB issued guidance that simplifies the subsequent measurement of goodwill. Under this guidance, if an initial qualitative assessment indicates that the fair value of an operating subsidiary may be less than its carrying amount, an impairment charge is recognized for the amount by which the carrying amount of the operating subsidiary exceeds its estimated fair value. Any resulting impairment loss recognized cannot exceed the total amount of goodwill associated with the operating subsidiary. This guidance is effective in the first quarter of 2020 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2020 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition. See Note 2 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for further information on Alleghany’s goodwill.

In August 2017, the FASB issued guidance that simplifies the requirements to achieve hedge accounting, better reflects the economic results of hedging in the financial statements and improves the alignment between hedge accounting and a company’s risk management activities. This guidance is effective in the first quarter of 2019 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2019 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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2. Fair Value of Financial Instruments

The following table presents the carrying value and estimated fair value of Alleghany’s consolidated financial instruments as of June 30, 2018 and December 31, 2017:

	June 30, 2018				December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	17,401.1	$	17,401.1	$	17,406.5	$	17,406.5
Liabilities
Senior Notes and other debt(2)	$	1,569.4	$	1,697.6	$	1,484.9	$	1,614.6

(1) This table includes debt and equity securities, as well as partnership and non-marketable equity investments carried at fair value that are included in other invested assets. This table excludes investments accounted for using the equity method and commercial mortgage loans that are carried at unpaid principal balance. 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 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the senior notes and other debt.

The following tables present Alleghany’s financial instruments measured at fair value and the level of the fair value hierarchy of inputs used as of June 30, 2018 and December 31, 2017:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of June 30, 2018
Equity securities:
Common stock	$	4,704.2	$	3.6	$	-	$	4,707.8
Preferred stock		-		-		6.3		6.3
Total equity securities		4,704.2		3.6		6.3		4,714.1
Debt securities:
U.S. Government obligations		-		993.6		-		993.6
Municipal bonds		-		2,842.5		-		2,842.5
Foreign government obligations		-		932.9		-		932.9
U.S. corporate bonds		-		2,040.6		367.8		2,408.4
Foreign corporate bonds		-		1,317.6		94.8		1,412.4
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		-		1,160.7		-		1,160.7
Commercial mortgage-backed securities (“CMBS”)		-		540.6		-		540.6
Other asset-backed securities(2)		-		640.8		1,224.0		1,864.8
Total debt securities		-		10,469.3		1,686.6		12,155.9
Short-term investments		-		472.8		-		472.8
Other invested assets(3)		-		-		58.3		58.3
Total investments (excluding equity method investments and loans)	$	4,704.2	$	10,945.7	$	1,751.2	$	17,401.1
Senior Notes and other debt	$	-	$	1,512.2	$	185.4	$	1,697.6

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	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	4,090.7	$	3.8	$	-	$	4,094.5
Preferred stock		-		3.1		1.9		5.0
Total equity securities		4,090.7		6.9		1.9		4,099.5
Debt securities:
U.S. Government obligations		-		948.0		-		948.0
Municipal bonds		-		3,682.1		-		3,682.1
Foreign government obligations		-		1,006.6		-		1,006.6
U.S. corporate bonds		-		2,173.0		260.0		2,433.0
Foreign corporate bonds		-		1,424.6		75.2		1,499.8
Mortgage and asset-backed securities:
RMBS(1)		-		833.8		161.8		995.6
CMBS		-		550.1		1.6		551.7
Other asset-backed securities(2)		-		503.3		1,101.3		1,604.6
Total debt securities		-		11,121.5		1,599.9		12,721.4
Short-term investments		-		578.1		-		578.1
Other invested assets(3)		-		-		7.5		7.5
Total investments (excluding equity method investments and loans)	$	4,090.7	$	11,706.5	$	1,609.3	$	17,406.5
Senior Notes and other debt	$	-	$	1,513.6	$	101.0	$	1,614.6

(1) Primarily includes government agency pass-through securities guaranteed by a government agency or government sponsored enterprise, among other types of RMBS.

(2) Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

(3) Includes partnership and non-marketable equity investments accounted for at fair value, and excludes investments accounted for using the equity method.

In the three and six months ended June 30, 2018, Alleghany transferred out of Level 3 $151.9 million and $153.5 million, respectively, of financial instruments, principally due to an increase in observable inputs related to the valuation of such assets. Specifically, during the second quarter of 2018, there was a decrease in the weight given to non-binding broker quotes, and as such, there was a corresponding increase in quoted prices for similar assets in active markets. Of the $153.5 million of transfers, $150.6 million related to RMBS in the second quarter of 2018, $1.6 million related to CMBS in the first quarter of 2018 and $1.3 million related to U.S. corporate bonds in the second quarter of 2018.

As further described in Note 3(h), on March 15, 2018, most of AIHL’s limited partnership interests in certain subsidiaries of Ares Management LLC (“Ares”) were converted into Ares common units. As a result of the conversion, as of March 15, 2018, $208.2 million of Ares common units, classified as common stock, was transferred into Level 1, and $58.7 million of Ares limited partner interests, classified as other invested assets, was transferred into Level 3.

In addition to the above, in the three and six months ended June 30, 2018, Alleghany transferred into Level 3 $1.3 million and $5.6 million, respectively, of financial instruments, principally due to a decrease in observable inputs related to the valuation of such assets and, specifically, a decrease in broker quotes. Of the $5.6 million of transfers, $4.3 million related to preferred stock, $1.2 million related to U.S. corporate bonds, and $0.1 million related to other invested assets. There were no other material transfers between Levels 1, 2 or 3 in the three and six months ended June 30, 2018.

In the three and six months ended June 30, 2017, Alleghany transferred out of Level 3 $3.1 million and $7.2 million, respectively, of financial instruments that were principally due to an increase in observable inputs related to the valuation of such assets and, specifically, an increase in broker quotes. Of the $7.2 million of transfers, $4.8 million related to U.S. corporate bonds and $2.4 million related to common stock.

In the three and six months ended June 30, 2017, Alleghany transferred into Level 3 $2.1 million and $4.7 million, respectively, of financial instruments that were principally due to a decrease in observable inputs related to the valuation of such assets and, specifically, a decrease in broker quotes. Of the $4.7 million of transfers, $3.0 million related to U.S. corporate bonds, $1.4 million related to common stock and $0.3 million related to foreign corporate bonds. There were no other material transfers between Levels 1, 2 or 3 in the three and six months ended June 30, 2017.

9

The following tables present reconciliations of the changes during the six months ended June 30, 2018 and 2017 in Level 3 assets measured at fair value:

							Debt Securities
													Mortgage and asset-backed
Six Months Ended June 30, 2018				Preferred   Stock			U.S.   Corporate   Bonds			Foreign   Corporate   Bonds			RMBS			CMBS			Other Asset- backed     Securities			Other       Invested       Assets(1)			Total
				($ in millions)
Balance as of January 1, 2018				$	1.9		$	260.0		$	75.2		$	161.8		$	1.6		$	1,101.3		$	7.5		$	1,609.3
Net realized/unrealized gains (losses) included in:
Net earnings(2)					-			-			(0.1	)		(0.3	)		-			1.0			1.1			1.7
Other comprehensive income					0.2			(6.9	)		(2.2	)		(5.3	)		-			(7.7	)		(3.5	)		(25.4	)
Purchases					-			117.3			23.8			-			-			495.1			-			636.2
Sales					(0.1	)		(2.5	)		(1.9	)		(5.6	)		-			(365.7	)		(5.6	)		(381.4	)
Issuances					-			-			-			-			-			-			-			-
Settlements					-			-			-			-			-			-			-			-
Transfers into Level 3					4.3			1.2			-			-			-			-			58.8			64.3
Transfers out of Level 3					-			(1.3	)		-			(150.6	)		(1.6	)		-			-			(153.5	)
Balance as of June 30, 2018				$	6.3		$	367.8		$	94.8		$	-		$	-		$	1,224.0		$	58.3		$	1,751.2
	Equity Securities						Debt Securities
													Mortgage and asset-backed
Six Months Ended June 30, 2017	Common   Stock			Preferred   Stock			U.S.   Corporate   Bonds			Foreign   Corporate   Bonds			RMBS			CMBS			Other Asset- backed     Securities			Other       Invested       Assets(1)			Total
													($ in millions)
Balance as of January 1, 2017	$	4.3		$	-		$	72.9		$	0.4		$	5.9		$	4.3		$	903.8		$	28.1		$	1,019.7
Net realized/unrealized gains (losses) included in:
Net earnings(2)		(0.1	)		-			(0.3	)		-			0.1			-			2.7			10.8			13.2
Other comprehensive income		0.5			-			1.5			0.4			0.2			0.1			11.9			(10.6	)		4.0
Purchases		-			2.4			151.4			36.0			-			-			578.0			-			767.8
Sales		(1.8	)		(0.2	)		(4.3	)		(0.1	)		-			(2.2	)		(19.7	)		(21.6	)		(49.9	)
Issuances		-			-			-			-			-			-			-			-			-
Settlements		-			-			(4.4	)		-			(0.7	)		(0.3	)		(315.8	)		-			(321.2	)
Transfers into Level 3		1.4			-			3.0			0.3			-			-			-			-			4.7
Transfers out of Level 3		(2.4	)		-			(4.8	)		-			-			-			-			-			(7.2	)
Balance as of June 30, 2017	$	1.9		$	2.2		$	215.0		$	37.0		$	5.5		$	1.9		$	1,160.9		$	6.7		$	1,431.1

(1) Includes partnership and non-marketable equity investments accounted for at fair value.

(2) There were no other than temporary impairment (“OTTI”) losses recorded in net earnings related to Level 3 assets still held as of June 30, 2018 and 2017.

Net unrealized losses related to Level 3 assets as of June 30, 2018 and December 31, 2017 were not material.

See Note 1(c) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for Alleghany’s accounting policy on fair value.

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3. Investments

(a) Unrealized Gains and Losses

The following tables present the amortized cost or cost and the fair value of AFS securities as of June 30, 2018 and December 31, 2017:

	Amortized Cost or Cost		Gross   Unrealized   Gains		Gross   Unrealized   Losses		Fair Value
	($ in millions)
As of June 30, 2018
Debt securities:
U.S. Government obligations	$	1,026.0	$	0.6	$	(33.0)	$	993.6
Municipal bonds		2,803.5		56.1		(17.1)		2,842.5
Foreign government obligations		929.3		9.3		(5.7)		932.9
U.S. corporate bonds		2,432.4		17.9		(41.9)		2,408.4
Foreign corporate bonds		1,418.5		12.9		(19.0)		1,412.4
Mortgage and asset-backed securities:
RMBS		1,184.1		3.3		(26.7)		1,160.7
CMBS		545.5		2.5		(7.4)		540.6
Other asset-backed securities(1)		1,866.7		4.9		(6.8)		1,864.8
Total debt securities		12,206.0		107.5		(157.6)		12,155.9
Short-term investments		472.8		-		-		472.8
Total investments	$	12,678.8	$	107.5	$	(157.6)	$	12,628.7
	Amortized Cost or Cost		Gross   Unrealized   Gains		Gross   Unrealized   Losses		Fair Value
			($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	3,165.8	$	932.5	$	(3.8)	$	4,094.5
Preferred stock		4.9		0.1		-		5.0
Total equity securities		3,170.7		932.6		(3.8)		4,099.5
Debt securities:
U.S. Government obligations		963.9		1.7		(17.6)		948.0
Municipal bonds		3,578.9		109.8		(6.6)		3,682.1
Foreign government obligations		1,000.1		11.2		(4.7)		1,006.6
U.S. corporate bonds		2,381.1		61.6		(9.7)		2,433.0
Foreign corporate bonds		1,481.8		24.5		(6.5)		1,499.8
Mortgage and asset-backed securities:
RMBS		993.9		6.3		(4.6)		995.6
CMBS		545.0		9.0		(2.3)		551.7
Other asset-backed securities(1)		1,592.1		13.8		(1.3)		1,604.6
Total debt securities		12,536.8		237.9		(53.3)		12,721.4
Short-term investments		578.1		-		-		578.1
Total investments	$	16,285.6	$	1,170.5	$	(57.1)	$	17,399.0

(1) Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

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(b) Contractual Maturity

The following table presents the amortized cost or cost and estimated fair value of debt securities by contractual maturity as of June 30, 2018. 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 or Cost		Fair Value
	($ in millions)
As of June 30, 2018
Short-term investments due in one year or less	$	472.8	$	472.8
Mortgage and asset-backed securities(1)		3,596.3		3,566.1
Debt securities with maturity dates:
One year or less		348.2		348.2
Over one through five years		3,042.6		3,024.8
Over five through ten years		2,997.0		2,973.6
Over ten years		2,221.9		2,243.2
Total debt securities	$	12,206.0	$	12,155.9

(1) Mortgage and asset-backed securities by their nature do not generally have single maturity dates.

(c) Net Investment Income

The following table presents net investment income for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
	($ in millions)
Interest income	$	104.8		$	102.5		$	206.8		$	201.7
Dividend income		22.3			11.8			38.6			21.2
Investment expenses		(6.6	)		(6.9	)		(18.6	)		(14.3	)
Pillar Investments(1)		1.9			3.2			1.9			6.6
Limited partnership interests in certain subsidiaries of Ares(1)		(0.7	)		(12.6	)		13.2			(7.4	)
Other investment results		4.6			3.7			8.5			9.4
Total	$	126.3		$	101.7		$	250.4		$	217.2

(1) See Note 3(h) of this Form 10-Q for discussion of the Pillar Investments, as defined therein, and limited partnership interests in certain subsidiaries of Ares.

As of June 30, 2018, non-income producing invested assets were immaterial.

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(d) Change in the Fair Value of Equity Securities

In the first quarter of 2018, Alleghany adopted new investment accounting guidance, which requires changes in the fair value of equity securities, except those accounted for under the equity method, to be recognized in net earnings. In earlier periods, equity securities were considered to be AFS and were included in the analysis of OTTI. See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of this new guidance.

The following table presents increases in the fair value of equity securities for the three and six months ended June 30, 2018:

	Three Months Ended		Six Months Ended
	June 30, 2018		June 30, 2018
	($ in millions)
Change in the fair value of equity securities sold during the period	$	4.4	$	16.0
Change in the fair value of equity securities held at the end of the period		180.8		126.6
Change in the fair value of equity securities	$	185.2	$	142.6

(e) Realized Gains and Losses

The proceeds from sales of debt and equity securities were $0.8 billion and $1.5 billion for the three months ended June 30, 2018 and 2017, respectively, and $1.9 billion and $4.2 billion for the six months ended June 30, 2018 and 2017, respectively.

Realized capital gains and losses for the three months ended June 30, 2018 primarily reflect the sale of debt securities. Realized capital gains and losses for the first six months of 2018 primarily reflect a $45.7 million gain on AIHL’s conversion of its limited partnership interests in certain subsidiaries of Ares into Ares common units. See Note 3(h) of this Form 10-Q for additional information on this conversion.

Realized capital gains and losses for the three and six months ended June 30, 2017 primarily reflect the sale of equity securities. Realized capital gains for the first six months of 2017 also include the sale of certain equity securities resulting from a partial restructuring of the equity portfolio.

The following table presents amounts of gross realized capital gains and gross realized capital losses for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	($ in millions)
Gross realized capital gains	$	6.5	$	34.0	$	66.4	$	142.7
Gross realized capital losses		-		(24.7)		(15.4)		(73.8)
Net realized capital gains	$	6.5	$	9.3	$	51.0	$	68.9

Gross realized loss amounts exclude OTTI losses, as discussed below.

(f) OTTI Losses

Alleghany holds its debt securities as AFS and, as such, these securities are recorded at fair value. Alleghany continually monitors the difference between amortized cost and the estimated fair value of its debt investments, which involves uncertainty as to whether declines in value are temporary in nature. The analysis of a security’s decline in value is performed in its functional currency. If the decline 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 its amortized cost-basis down to the fair value of the security and records an OTTI loss on its statement of earnings. In addition, any portion of such decline related to a debt security that is believed to arise from factors other than credit is recorded as a component of other comprehensive income rather than charged against earnings.

Debt securities in an unrealized loss position are evaluated for OTTI if they meet any of the following criteria: (i) they are trading at a discount of at least 20 percent to amortized cost for an extended period of time (nine consecutive months or more); (ii) there has been a negative credit or news event with respect to the issuer that could indicate the existence of an OTTI; or (iii) Alleghany intends to sell, or it is more likely than not that Alleghany will sell, the debt security before recovery of its amortized cost basis.

If Alleghany intends to sell, or it is more likely than not that Alleghany will sell, a debt security before recovery of its amortized cost basis, the total amount of the unrealized loss position is recognized as an OTTI loss in earnings. To the extent that a debt security that is in an unrealized loss position is not impaired based on the preceding, Alleghany will consider a debt security to be impaired when it believes it to be probable that Alleghany will not be able to collect the entire amortized cost basis. For debt securities in an

13

unrealized loss position as of the end of each quarter, Alleghany develops a best estimate of the present value of expected cash flows. If the results of the cash flow analysis indicate that Alleghany will not recover the full amount of its amortized cost basis in the debt security, Alleghany records an OTTI loss in earnings equal to the difference between the present value of expected cash flows and the amortized cost basis of the debt security. If applicable, the difference between the total unrealized loss position on the debt security and the OTTI loss recognized in earnings is the non-credit related portion, which is recorded as a component of other comprehensive income.

In developing the cash flow analyses for debt securities, Alleghany considers various factors for the different categories of debt securities. For municipal bonds, Alleghany takes into account the taxing power of the issuer, source of revenue, credit risk and enhancements and pre-refunding. For mortgage and asset-backed securities, Alleghany discounts its best estimate of future cash flows at an effective rate equal to the original effective yield of the security or, in the case of floating rate securities, at the current coupon. Alleghany’s models include assumptions about prepayment speeds, default and delinquency rates, underlying collateral (if any), credit ratings, credit enhancements and other observable market data. For corporate bonds, Alleghany reviews business prospects, credit ratings and available information from asset managers and rating agencies for individual securities.

OTTI losses in the first six months of 2018 reflect $0.5 million of unrealized losses on debt securities that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $0.5 million of OTTI losses, none were incurred in the second quarter of 2018.

OTTI losses in the first six months of 2017 reflect $7.0 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $7.0 million of OTTI losses, $6.8 million related to equity securities, primarily in the retail sector, and $0.2 million related to debt securities. The determination that unrealized losses on the securities were other than temporary was primarily due to the duration of the decline in the fair value of equity and debt securities relative to their costs. Of the $7.0 million of OTTI losses, $3.8 million was incurred in the second quarter of 2017.

Upon the ultimate disposition of the securities for which OTTI losses have been recorded, a portion of the loss may be recoverable depending on market conditions at the time of disposition. After adjusting the amortized cost basis of securities for the recognition of OTTI losses, the remaining gross unrealized investment losses for debt securities as of June 30, 2018 were deemed to be temporary, based on, among other factors: (i) the duration of time and the relative magnitude to which the fair value of these investments had been below cost were not indicative of an OTTI loss; (ii) the absence of compelling evidence that would cause Alleghany to call into question the financial condition or near-term business prospects of the issuer of the security; and (iii) Alleghany’s ability and intent to hold the security for a period of time sufficient to allow for any anticipated recovery.

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’s methodology for assessing other than temporary declines in value contains inherent risks and uncertainties which 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 conditions or social trends, interest rates or credit ratings.

(g) Aging of Gross Unrealized Losses

The following tables present gross unrealized losses and related fair values for Alleghany’s AFS securities, grouped by duration of time in a continuous unrealized loss position, as of June 30, 2018 and December 31, 2017:

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	($ in millions)
As of June 30, 2018
Debt securities:
U.S. Government obligations	$	532.8	$	12.7	$	390.1	$	20.3	$	922.9	$	33.0
Municipal bonds		543.2		8.2		215.2		8.9		758.4		17.1
Foreign government obligations		189.9		2.1		130.5		3.6		320.4		5.7
U.S. corporate bonds		1,355.7		32.1		174.1		9.8		1,529.8		41.9
Foreign corporate bonds		656.7		12.7		189.2		6.3		845.9		19.0
Mortgage and asset-backed securities:
RMBS		887.3		21.3		116.5		5.4		1,003.8		26.7
CMBS		277.9		4.6		32.3		2.8		310.2		7.4
Other asset-backed securities		982.2		6.4		27.7		0.4		1,009.9		6.8
Total temporarily impaired securities	$	5,425.7	$	100.1	$	1,275.6	$	57.5	$	6,701.3	$	157.6

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	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	145.7	$	3.8	$	-	$	-	$	145.7	$	3.8
Preferred stock		-		-		-		-		-		-
Total equity securities		145.7		3.8		-		-		145.7		3.8
Debt securities:
U.S. Government obligations		447.8		4.4		416.6		13.2		864.4		17.6
Municipal bonds		240.0		1.5		267.3		5.1		507.3		6.6
Foreign government obligations		321.9		2.7		72.2		2.0		394.1		4.7
U.S. corporate bonds		568.8		6.1		207.3		3.6		776.1		9.7
Foreign corporate bonds		417.4		3.0		159.4		3.5		576.8		6.5
Mortgage and asset-backed securities:
RMBS		284.2		1.6		131.5		3.0		415.7		4.6
CMBS		112.2		0.5		34.7		1.8		146.9		2.3
Other asset-backed securities		211.1		0.9		65.7		0.4		276.8		1.3
Total debt securities		2,603.4		20.7		1,354.7		32.6		3,958.1		53.3
Total temporarily impaired securities	$	2,749.1	$	24.5	$	1,354.7	$	32.6	$	4,103.8	$	57.1

As of June 30, 2018, Alleghany held a total of 1,995 debt securities that were in an unrealized loss position, of which 430 securities were in an unrealized loss position continuously for 12 months or more. The unrealized losses associated with these debt securities consisted primarily of losses related primarily to U.S. Government obligations, U.S. corporate bonds, municipal bonds, foreign corporate bonds and RMBS.

As of June 30, 2018, the vast majority of Alleghany’s debt securities were rated investment grade, with 4.3 percent of debt securities having issuer credit ratings that were below investment grade or not rated, compared with 5.3 percent as of December 31, 2017.

(h) Investments in Certain Other Invested Assets

In December 2012, TransRe obtained an ownership interest in Pillar Capital Holdings Limited (“Pillar Holdings”), a Bermuda-based insurance asset manager focused on collateralized reinsurance and catastrophe insurance-linked securities. Additionally, TransRe invested $175.0 million and AIHL invested $25.0 million in limited partnership funds managed by Pillar Holdings (the “Funds”). The objective of the Funds is to create portfolios with attractive risk-reward characteristics and low correlation with other asset classes, using the extensive reinsurance and capital market experience of the principals of Pillar Holdings. Alleghany has concluded that both Pillar Holdings and the Funds (collectively, the “Pillar Investments”) represent variable interest entities and that Alleghany is not the primary beneficiary, as it does not have the ability to direct the activities that most significantly impact each entity’s economic performance. Therefore, the Pillar Investments are not consolidated and are accounted for under the equity method of accounting. Alleghany’s potential maximum loss in the Pillar Investments is limited to its cumulative net investment. As of June 30, 2018, Alleghany’s carrying value in the Pillar Investments, as determined under the equity method of accounting, was $219.8 million, which is net of returns of capital received from the Pillar Investments.

In July 2013, AIHL invested $250.0 million in Ares, an asset manager, in exchange for a 6.25 percent equity stake in Ares, with an agreement to engage Ares to manage up to $1.0 billion in certain investment strategies. In May 2014, Ares completed an initial public offering of its common units. Upon completion of the initial public offering, Alleghany’s equity investment in Ares converted into limited partner interests in certain Ares subsidiaries that were convertible into Ares common units. On March 15, 2018, most of AIHL’s limited partner interests were converted into Ares common units. As a result of the conversion and with respect to the limited partnership interests that were converted into Ares common units, AIHL: (i) reclassified its converted interests from other invested assets to equity securities; (ii) increased its carrying value to $208.2 million to reflect the fair value of Ares common units; and (iii) recorded the $45.7 million increase in carrying value as a realized capital gain as of March 15, 2018. As a result of the conversion and with respect to the unconverted limited partnership interests, AIHL: (i) changed its accounting from the equity method to fair value; (ii) increased its carrying value to $58.7 million to reflect the fair value of Ares limited partnership interests; and (iii) recorded the $12.9 million increase in carrying value as a component of net investment income as of March 15, 2018.    

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(i) Investments in Commercial Mortgage Loans

As of June 30, 2018, the carrying value of Alleghany’s commercial mortgage loan portfolio was $695.8 million, representing the unpaid principal balance on the loans. As of June 30, 2018, there was no allowance for loan losses. The commercial mortgage loan portfolio consists primarily of first mortgages on commercial properties in major metropolitan areas in the U.S. The loans earn interest at fixed- and floating-rates, mature in two to ten years from loan origination and the principal amounts of the loans were no more than approximately two-thirds of the property’s appraised value at the time the loans were made.

4. Reinsurance Ceded

Alleghany’s reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite in order to reduce the effect of individual or aggregate exposure to losses, manage capacity, protect capital resources, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns and enable them to increase gross premium writings and risk capacity without requiring additional capital. Alleghany’s reinsurance and insurance subsidiaries purchase reinsurance and retrocessional coverages from highly-rated third-party reinsurers. If the assuming reinsurers are unable or unwilling to meet the obligations assumed under the applicable reinsurance agreements, Alleghany’s reinsurance and insurance subsidiaries would remain liable for such reinsurance portion not paid by these reinsurers. As such, funds, trust agreements and letters of credit are held to collateralize a portion of Alleghany’s reinsurance recoverables and Alleghany’s reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite or assume with multiple reinsurance programs.

TransRe enters into retrocession arrangements, including property catastrophe retrocession arrangements, in order to reduce the effect of individual or aggregate exposure to losses, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns and increase gross premium writings and risk capacity without requiring additional capital.

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 and property per risk reinsurance program run on an annual basis from May 1 to the following April 30 and portions expired on April 30, 2018. Both programs were renewed on May 1, 2018 with substantially similar terms as the expired programs.

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5. Liability for Loss and LAE

(a) Liability Rollforward

The following table presents the activity in the liability for loss and LAE in the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018			2017
	($ in millions)
Reserves as of January 1	$	11,871.3		$	11,087.2
Less: reinsurance recoverables(1)		1,650.1			1,236.2
Net reserves as of January 1		10,221.2			9,851.0
Other adjustments		2.0			-
Incurred loss and LAE, net of reinsurance, related to:
Current year		1,546.7			1,545.6
Prior years		(137.9	)		(111.4	)
Total incurred loss and LAE, net of reinsurance		1,408.8			1,434.2
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		237.6			242.7
Prior years		1,366.1			1,190.1
Total paid loss and LAE, net of reinsurance		1,603.7			1,432.8
Foreign currency exchange rate effect		(24.2	)		55.4
Net reserves as of June 30		10,004.1			9,907.8
Reinsurance recoverables as of June 30(1)		1,511.4			1,152.4
Reserves as of June 30	$	11,515.5		$	11,060.2

(1) Reinsurance recoverables in this table include only ceded loss and LAE reserves.

(2) Includes paid losses, net of reinsurance, related to commutations.

Gross loss and LAE reserves and reinsurance recoverables as of June 30, 2018 decreased from December 31, 2017, primarily reflecting payments on catastrophe losses incurred in 2017 and favorable prior accident year loss reserve development. The decrease in net loss and LAE reserves was partially offset by the collection of reinsurance recoverables related to catastrophe losses incurred in 2017.

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(b) Liability Development

The following table presents the (favorable) unfavorable prior accident year loss reserve development for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	5.1(	1)	$	(4.0)	(2)	$	(25.3)	(3)	$	(4.4)	(2)
Non-catastrophe		(18.8)	(4)		(18.9)	(5)		(29.8)	(4)		(50.0)	(5)
Total property		(13.7)			(22.9)			(55.1)			(54.4)
Casualty & other:
Malpractice Treaties(6)		(3.4)			(2.0)			(3.4)			(2.0)
Ogden rate impact(7)		-			-			-			24.4
Other		(33.6)	(8)		(27.7)	(9)		(63.8)	(10)		(58.9)	(9)
Total casualty & other		(37.0)			(29.7)			(67.2)			(36.5)
Total Reinsurance Segment		(50.7)			(52.6)			(122.3)			(90.9)
Insurance Segment
RSUI:
Casualty		(1.5)	(11)		(9.5)	(12)		(12.5)	(13)		(21.6)	(12)
Property and other		0.1			(0.8)			-			2.9(	14)
Total RSUI		(1.4)			(10.3)			(12.5)			(18.7)
CapSpecialty		(0.1)			(0.2)	(15)		(3.1)	(16)		(0.8)	(15)
PacificComp		-			(0.5)	(17)		-			(1.0)	(17)
Total incurred related to prior years	$	(52.2)		$	(63.6)		$	(137.9)		$	(111.4)

(1) Primarily reflects unfavorable prior accident year loss reserve development related to Hurricane Maria that occurred in the 2017 accident year, partially offset by favorable prior accident year loss reserve development related to Hurricane Harvey that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

(2) Primarily reflects favorable prior accident year loss reserve development related to catastrophes that occurred in the 2010 through 2016 accident years.

(3) Primarily reflects favorable prior accident year loss reserve development related to Hurricanes Harvey and Maria that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

(4) Primarily reflects favorable prior accident year loss reserve development in the 2016 and 2017 accident years.

(5) Primarily reflects favorable prior accident year loss reserve development in the 2013 through 2016 accident years.

(6) Represents certain medical malpractice treaties pursuant to which the increased underwriting profits created by the favorable prior accident year loss reserve development are largely retained by the cedants. As a result, the favorable prior accident year loss reserve development is largely offset by an increase in profit commission expense incurred when such favorable prior accident year loss reserve development occurs.

(7) Represents unfavorable prior accident year loss reserve development related to the U.K. Ministry of Justice’s significant reduction in the discount rate, referred to as the Ogden rate, used to calculate lump-sum bodily injury payouts in personal injury insurance claims in the U.K to negative 0.75 percent as of March 20, 2017 from 2.50 percent.

(8) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2015 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

(9) Primarily reflects favorable prior accident year loss reserve development in the longer-tailed U.S. professional liability lines of business in the 2005 through 2014 accident years, partially offset by unfavorable development in the shorter-tailed casualty lines of business in the 2015 accident year in the U.S. and in the U.K.

(10) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2016 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

(11) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors’ and officers’ liability lines of business in the 2012 accident year.

(12) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2011 accident years.

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(13) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors’ and officers’ liability lines of business in the 2009 and 2012 accident years.

(14) Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business in the 2015 and 2016 accident years.

(15) Primarily reflects favorable prior accident year loss reserve development in the casualty lines of business in the 2010 and 2015 accident years.

(16) Primarily reflects favorable prior accident year loss reserve development in the surety lines of business in the 2016 and 2017 accident years.

(17) Primarily reflects favorable prior accident year loss reserve development in the 2013 and prior accident years.

6. Income Taxes

The effective tax rate on earnings before income taxes for the first six months of 2018 was 19.1 percent, compared with 27.6 percent for the first six months of 2017. The decrease in the effective tax rate in the first six months of 2018 from the first six months of 2017 primarily reflects the decrease in the U.S. corporate federal income tax rate from 35.0 percent to 21.0 percent due to the Tax Act, partially offset by new limitations on certain deductions as a result of the Tax Act. There continues to be a degree of uncertainty as to how certain provisions of the Tax Act will be interpreted and implemented in practice in the future.

Alleghany believes that, as of June 30, 2018, it had no material uncertain tax positions. Interest and penalties related to unrecognized tax expenses (benefits) are recognized in income tax expense, when applicable. There were no material liabilities for interest or penalties accrued as of June 30, 2018.

7. Stockholders’ Equity

(a) Common Stock Repurchases

In November 2015, the Alleghany Board of Directors authorized the repurchase of shares of common stock of Alleghany, par value $1.00 per share (“Common Stock”), at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million (the “2015 Repurchase Program”). In June 2018, the Alleghany Board of Directors authorized, upon the completion of the 2015 Repurchase Program, the repurchase of additional shares of Common Stock, at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million. As of June 30, 2018, Alleghany had $527.1 million remaining under both share repurchase authorization programs.

The following table presents the shares of Common Stock that Alleghany repurchased in the three and six months ended June 30, 2018 and 2017 pursuant to the 2015 Repurchase Program:     

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Shares repurchased		368,551		-		403,623		-
Cost of shares repurchased (in millions)	$	214.8	$	-	$	236.1	$	-
Average price per share repurchased	$	582.92	$	-	$	584.96	$	-

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(b) Accumulated Other Comprehensive Income (loss)

The following table presents a reconciliation of the changes during the six months ended June 30, 2018 and 2017 in accumulated other comprehensive income (loss) attributable to Alleghany stockholders:

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2018	$	718.2		$	(84.6	)		$      (15.5	)	$	618.1
Cumulative effect of adoption of new accounting pronouncements(1):
Reclassification of net unrealized gains on equity securities, net of tax		(735.6	)		-			-			(735.6	)
Reclassification of stranded taxes		156.6			(18.2	)		(3.3	)		135.1
Total		(579.0	)		(18.2	)		(3.3	)		(600.5	)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		(179.7	)		(5.4	)		(1.1	)		(186.2	)
Reclassifications from accumulated other comprehensive income		(3.7	)		-			-			(3.7	)
Total		(183.4	)		(5.4	)		(1.1	)		(189.9	)
Balance as of June 30, 2018	$	(44.2	)	$	(108.2	)	$	(19.9	)	$	(172.3	)
	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2017	$	232.2		$	(111.2	)	$	(11.7	)	$	109.3
Cumulative effect of adoption of new accounting pronouncements(1)		12.9			-			-			12.9
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		266.7			15.0			(0.3	)		281.4
Reclassifications from accumulated other comprehensive income		(40.3	)		-			-			(40.3	)
Total		226.4			15.0			(0.3	)		241.1
Balance as of June 30, 2017	$	471.5		$	(96.2	)	$	(12.0	)	$	363.3

(1) See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of new investment accounting guidance and new guidance on certain tax effects caused by the Tax Act.

The following table presents reclassifications out of accumulated other comprehensive income attributable to Alleghany stockholders during the three and six months ended June 30, 2018 and 2017:

Accumulated Other		Three Months Ended June 30,						Six Months Ended June 30,
Comprehensive Income Component	Line in Consolidated Statement of Earnings	2018			2017			2018			2017
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(6.5	)	$	(9.3	)	$	(5.3	)	$	(68.9	)
	Other than temporary impairment losses		-			3.8			0.5			7.0
	Income taxes		1.4			1.9			1.1			21.6
Total reclassifications:	Net earnings	$	(5.1	)	$	(3.6	)	$	(3.7	)	$	(40.3	)

(1) For the six month period ended June 30, 2018, excludes a $45.7 million pre-tax gain from AIHL’s conversion of its limited partnership interests in certain subsidiaries of Ares into Ares common units. See Note 3(h) of this Form 10-Q for additional information.

(c) Special Dividend

In February 2018, the Alleghany Board of Directors declared a special dividend of $10 per share for stockholders of record on March 5, 2018. On March 15, 2018, Alleghany paid dividends to stockholders totaling $154.0 million.

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8. Earnings Per Share of Common Stock

The following table presents a reconciliation of the earnings and share data used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
	($ in millions, except share amounts)
Net earnings available to Alleghany stockholders	$	295.1	$	101.8	$	466.7	$	251.0
Effect of dilutive securities		-		-		-		-
Income available to common stockholders for diluted earnings per share	$	295.1	$	101.8	$	466.7	$	251.0
Weighted average common shares outstanding applicable to basic earnings per share		15,180,075		15,419,034		15,284,679		15,416,366
Effect of dilutive securities		-		-		4,915		5,703
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		15,180,075		15,419,034		15,289,594		15,422,069

57,766 and 75,035 contingently issuable shares were potentially available during the first six months of 2018 and 2017, respectively, but were not included in the diluted earnings per share computations because the impact was anti-dilutive to the earnings per share calculation.

9. Commitments and Contingencies

(a) Legal Proceedings

Certain of 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 are adequate, and management does not believe that any pending litigation will have a material adverse effect on Alleghany’s consolidated results of operations, financial position or cash flows.

(b) Leases

Alleghany and its subsidiaries lease certain facilities, furniture and equipment under long-term lease agreements. Additional information about leases can be found in Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

(c) Energy Holdings

As of June 30, 2018, Alleghany had holdings in energy sector businesses of $920.0 million, comprised of $289.6 million of debt securities, $487.1 million of equity securities and $143.3 million of Alleghany’s equity attributable to SORC.

10. Segments of Business

(a) Overview

Alleghany’s segments are reported in a manner consistent with the way management evaluates the business. As such, Alleghany classifies its business into three reportable segments – reinsurance, insurance and Alleghany Capital. Alleghany determined that Alleghany Capital qualified as a reportable segment in the first quarter of 2018, reflecting the increased significance of Alleghany Capital’s business to Alleghany and its projected growth.

Reinsurance and insurance underwriting activities are evaluated separately from investment and other activities. Segment accounting policies are described in Note 1 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

The reinsurance segment consists of property and casualty reinsurance operations conducted by TransRe’s reinsurance operating subsidiaries and is further reported through two major product lines – property and casualty & other. TransRe provides property and casualty reinsurance to insurers and reinsurers through brokers and on a direct basis to ceding companies. TransRe also writes a modest amount of insurance business, which is included in the reinsurance segment. A significant portion of the premiums earned by TransRe’s operations are generated by offices located in Canada, Europe, Asia, Australia, Africa and those serving Latin America and the Caribbean. Although the majority of the premiums earned by these offices typically relate to the regions where they are located, a significant portion may be derived from other regions of the world, including the U.S. In addition, although a significant

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portion of the assets and liabilities of these foreign offices generally relate to the countries where ceding companies and reinsurers are located, most investments are located in the country of domicile of these offices.

The insurance segment consists of property and casualty insurance operations conducted in the U.S. by AIHL through its insurance operating subsidiaries RSUI, CapSpecialty and, prior to its sale on December 31, 2017, PacificComp. RSUI also writes a modest amount of assumed reinsurance business, which is included in the insurance segment.

The Alleghany Capital segment consists of industrial operations, non-industrial operations and corporate operations at the Alleghany Capital level. Industrial operations are conducted through Bourn & Koch, Kentucky Trailer, W&W|AFCO Steel, beginning April 28, 2017 (the date on which Alleghany Capital acquired approximately 80 percent of the equity thereof), and a 45 percent equity interest in Wilbert, beginning August 1, 2017 (the date on which Alleghany Capital acquired a 45 percent equity interest therein). Non-industrial operations are conducted through IPS and Jazwares. On August 1, 2017, Alleghany Capital acquired a 45 percent equity interest in Wilbert.

On February 7, 2018, W&W|AFCO Steel acquired the outstanding equity of Hirschfeld, a fabricator of steel bridges and structural steel for stadiums, airports and other large commercial and industrial projects, for $111.3 million, consisting of $96.6 million in cash and $14.7 million of incremental debt. The acquisition-date consideration transferred and purchase price allocation to the acquired assets and assumed liabilities of Hirschfeld were based on estimated fair values that have not been finalized. As a result, the fair value recorded for these items is a provisional estimate and may be subject to adjustment. Once completed, any adjustment resulting from the valuations may impact the individual amounts recorded for acquired assets and assumed liabilities, as well as the residual goodwill. The acquisition accounting for Hirschfeld is expected to be finalized later in 2018.

Corporate activities are not classified as a segment. The primary components of corporate activities are Alleghany Properties, SORC and activities at the Alleghany parent company.

In addition, corporate activities include interest expense associated with the senior notes issued by Alleghany, whereas interest expense associated with senior notes issued by TransRe is included in “Total Segments” and interest expense associated with other debt is included in Alleghany Capital. Information related to the senior notes and other debt can be found in Note 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

(b) Results

The following tables present the results for Alleghany’s three reportable segments and for corporate activities for the three and six months ended June 30, 2018 and 2017:

	Reinsurance Segment						Insurance Segment
Three Months Ended June 30, 2018	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Total		Subtotal		Alleghany Capital			Total Segments		Corporate Activities(2)			Consolidated
	($ in millions)
Gross premiums written	$	345.1	$	726.6	$	1,071.7	$	318.8	$	88.7	$	407.5	$	1,479.2	$	-		$	1,479.2	$	(6.5	)	$	1,472.7
Net premiums written		275.9		700.7		976.6		216.9		82.3		299.2		1,275.8		-			1,275.8		-			1,275.8
Net premiums earned		292.1		689.2		981.3		184.7		71.0		255.7		1,237.0		-			1,237.0		-			1,237.0
Net loss and LAE		153.5		440.0		593.5		105.7		39.0		144.7		738.2		-			738.2		-			738.2
Commissions, brokerage and other underwriting expenses		94.8		223.2		318.0		53.7		30.4		84.1		402.1		-			402.1		-			402.1
Underwriting profit(3)	$	43.8	$	26.0	$	69.8	$	25.3	$	1.6	$	26.9		96.7		-			96.7		-			96.7
Net investment income														121.1		1.2			122.3		4.0			126.3
Change in the fair value of equity securities														146.8		-			146.8		38.4			185.2
Net realized capital gains														6.8		(0.1	)		6.7		(0.2	)		6.5
Other than temporary impairment losses														-		-			-		-			-
Noninsurance revenue														4.7		329.0			333.7		9.0			342.7
Other operating expenses														19.9		314.5			334.4		8.8			343.2
Corporate administration														0.8		-			0.8		13.3			14.1
Amortization of intangible assets														0.2		5.8			6.0		-			6.0
Interest expense														6.9		2.3			9.2		13.1			22.3
Earnings before income taxes													$	348.3	$	7.5		$	355.8	$	16.0		$	371.8

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	Reinsurance Segment						Insurance Segment
Three Months Ended June 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Subtotal			Alleghany Capital			Total Segments			Corporate Activities(2)			Consolidated
													($ in millions)
Gross premiums written	$	369.1	$	676.3	$	1,045.4	$	295.1	$	73.3	$	41.9	$	410.3	$	1,455.7		$	-		$	1,455.7		$	(5.7	)	$	1,450.0
Net premiums written		317.2		661.6		978.8		204.6		68.4		41.3		314.3		1,293.1			-			1,293.1			-			1,293.1
Net premiums earned		270.5		686.9		957.4		178.5		64.1		43.9		286.5		1,243.9			-			1,243.9			-			1,243.9
Net loss and LAE		122.9		450.1		573.0		93.8		35.6		32.5		161.9		734.9			-			734.9			-			734.9
Commissions, brokerage and other underwriting expenses		87.9		234.3		322.2		53.0		27.2		11.3		91.5		413.7			-			413.7			-			413.7
Underwriting profit(3)	$	59.7	$	2.5	$	62.2	$	31.7	$	1.3	$	0.1	$	33.1		95.3			-			95.3			-			95.3
Net investment income																98.0			0.2			98.2			3.5			101.7
Change in the fair value of equity securities																-			-			-			-			-
Net realized capital gains																9.2			0.2			9.4			(0.1	)		9.3
Other than temporary impairment losses																(3.8	)		-			(3.8	)		-			(3.8	)
Noninsurance revenue																3.3			192.8			196.1			6.7			202.8
Other operating expenses																25.9			189.4			215.3			9.9			225.2
Corporate administration																0.8			-			0.8			13.6			14.4
Amortization of intangible assets																(0.4	)		5.0			4.6			-			4.6
Interest expense																6.8			1.0			7.8			13.2			21.0
Earnings (losses) before income taxes															$	168.9		$	(2.2	)	$	166.7		$	(26.6	)	$	140.1

	Reinsurance Segment						Insurance Segment
Six Months Ended June 30, 2018	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities(2)			Consolidated
											($ in millions)
Gross premiums written	$	742.3	$	1,445.0	$	2,187.3	$	593.4	$	163.2	$	756.6	$	2,943.9		$	-	$	2,943.9		$	(12.4	)	$	2,931.5
Net premiums written		581.0		1,392.7		1,973.7		403.8		151.7		555.5		2,529.2			-		2,529.2			-			2,529.2
Net premiums earned		567.2		1,374.3		1,941.5		365.6		137.7		503.3		2,444.8			-		2,444.8			-			2,444.8
Net loss and LAE		250.1		882.8		1,132.9		202.6		73.3		275.9		1,408.8			-		1,408.8			-			1,408.8
Commissions, brokerage and other underwriting expenses		187.9		452.1		640.0		107.2		61.2		168.4		808.4			-		808.4			-			808.4
Underwriting profit(3)	$	129.2	$	39.4	$	168.6	$	55.8	$	3.2	$	59.0		227.6			-		227.6			-			227.6
Net investment income														239.4			3.1		242.5			7.9			250.4
Change in the fair value of equity securities														132.7			-		132.7			9.9			142.6
Net realized capital gains														50.7			0.5		51.2			(0.2	)		51.0
Other than temporary impairment losses														(0.5	)		-		(0.5	)		-			(0.5	)
Noninsurance revenue														10.4			571.7		582.1			12.3			594.4
Other operating expenses														37.0			554.4		591.4			16.7			608.1
Corporate administration														0.5			-		0.5			21.4			21.9
Amortization of intangible assets														-			11.2		11.2			-			11.2
Interest expense														13.6			3.6		17.2			26.6			43.8
Earnings (losses) before income taxes													$	609.2		$	6.1	$	615.3		$	(34.8	)	$	580.5

	Reinsurance Segment							Insurance Segment
Six Months Ended June 30, 2017	Property		Casualty & Other(1)			Total		RSUI		Cap Specialty		Pacific Comp			Total		Subtotal			Alleghany Capital			Total Segments			Corporate Activities(2)			Consolidated
															($ in millions)
Gross premiums written	$	744.5	$	1,356.6		$	2,101.1	$	559.6	$	138.8	$	82.6		$	781.0	$	2,882.1		$	-		$	2,882.1		$	(11.2	)	$	2,870.9
Net premiums written		602.4		1,325.8			1,928.2		387.2		129.4		81.4			598.0		2,526.2			-			2,526.2			-			2,526.2
Net premiums earned		557.3		1,326.2			1,883.5		361.2		126.2		82.2			569.6		2,453.1			-			2,453.1			-			2,453.1
Net loss and LAE		244.7		885.4			1,130.1		174.4		68.7		61.0			304.1		1,434.2			-			1,434.2			-			1,434.2
Commissions, brokerage and other underwriting expenses		178.7		459.0			637.7		107.9		54.9		21.7			184.5		822.2			-			822.2			-			822.2
Underwriting profit (loss)(3)	$	133.9	$	(18.2	)	$	115.7	$	78.9	$	2.6	$	(0.5	)	$	81.0		196.7			-			196.7			-			196.7
Net investment income																		210.3			0.5			210.8			6.4			217.2
Change in the fair value of equity securities																		-			-			-			-			-
Net realized capital gains																		69.4			0.1			69.5			(0.6	)		68.9
Other than temporary impairment losses																		(7.0	)		-			(7.0	)		-			(7.0	)
Noninsurance revenue																		5.8			337.6			343.4			10.7			354.1
Other operating expenses																		49.1			331.0			380.1			20.2			400.3
Corporate administration																		1.6			-			1.6			29.7			31.3
Amortization of intangible assets																		(0.9	)		9.3			8.4			-			8.4
Interest expense																		13.6			1.8			15.4			26.5			41.9
Earnings (losses) before income taxes																	$	411.8		$	(3.9	)	$	407.9		$	(59.9	)	$	348.0

(1) Primarily consists of the following assumed reinsurance lines of business: directors’ and officers’ liability; errors and omissions liability; general liability; medical malpractice; ocean marine and aviation; auto liability; accident and health; surety; and credit.

(2) Includes elimination of minor reinsurance activity between segments.

(3) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, OTTI losses,

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noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its reinsurance and insurance segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company’s ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.

(c) Identifiable Assets and Equity

The following table presents identifiable assets, the portion of identifiable assets related to cash and invested assets, and equity attributable to Alleghany, for Alleghany’s three reportable segments and for corporate activities as of June 30, 2018:

	Identifiable Assets		Invested Assets and Cash		Equity Attributable to Alleghany
	($ in millions)
Reinsurance segment	$	16,356.9	$	13,387.8	$	5,208.5
Insurance segment		6,837.9		5,263.3		2,891.5
Subtotal		23,194.8		18,651.1		8,100.0
Alleghany Capital		1,328.3		130.5		777.2
Total segments		24,523.1		18,781.6		8,877.2
Corporate activities		562.8		485.6		(472.8)
Consolidated	$	25,085.9	$	19,267.2	$	8,404.4

Included in Alleghany Capital is debt associated with its operating subsidiaries, which totaled $185.4 million as of June 30, 2018. The $185.4 million includes $95.0 million of borrowings by W&W|AFCO Steel under its available credit facility and term loans (including borrowings incurred and assumed from its acquisition of Hirschfeld), $41.0 million of borrowings by Jazwares under its available credit facility, $19.1 million of term loans at Kentucky Trailer primarily related to borrowings to finance small acquisitions and borrowings under its available credit facility, $15.7 million of borrowings by IPS under its available credit facility, and $14.6 million of term loans at Bourn & Koch related to borrowings to finance an acquisition and borrowings under its available credit facility. None of these liabilities are guaranteed by Alleghany or Alleghany Capital.

(d) Alleghany Capital Noninsurance Revenue

For Alleghany Capital’s industrial and non-industrial operations, noninsurance revenue consists of the sale of manufactured goods and services. The following table presents noninsurance revenue for the Alleghany Capital segment for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	($ in millions)
Industrial(1)	$	221.9	$	74.5	$	367.4	$	116.4
Non-industrial(2)		107.1		118.3		204.2		221.2
Corporate & other		-		-		0.1		-
Alleghany Capital	$	329.0	$	192.8	$	571.7	$	337.6

(1) For the three and six months ended June 30, 2018, the vast majority of noninsurance revenues were recognized as goods and services transferred to customers over time. For the three and six months ended June 30, 2017, approximately 66 percent and 57 percent, respectively, of noninsurance revenues were recognized as services were transferred to customers over time, with the remainder recognized as goods transferred at a point in time. See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of new revenue recognition accounting guidance effective in the first quarter of 2018.

(2) For the three and six months ended June 30, 2018, approximately 70 percent of noninsurance revenues were recognized as services transferred to customers over time, with the remainder recognized as goods transferred at a point in time. For the three and six months ended June 30, 2017, approximately 75 percent and 78 percent, respectively, of noninsurance revenues were recognized as services were transferred to customers over time, with the remainder recognized as goods were transferred at a point in time. See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of new revenue recognition accounting guidance effective in the first quarter of 2018.

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

The following is a discussion and analysis of our financial condition and results of operations for the three and six months ended June 30, 2018 and 2017. This discussion and analysis should be read in conjunction with our unaudited consolidated financial statements and Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Quarterly Report on Form 10-Q for the quarter ended June 30, 2018, or this “Form 10-Q,” and our audited consolidated financial statements and Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the Annual Report on Form 10-K for the year ended December 31, 2017, or the “2017 Form 10-K.”

References in this Form 10-Q to the “Company,” “Alleghany,” “we,” “us,” and “our” refer to Alleghany Corporation and its consolidated subsidiaries unless the context otherwise requires. In addition, unless the context otherwise requires, references to

• “TransRe” are to our wholly-owned reinsurance holding company subsidiary Transatlantic Holdings, Inc. and its subsidiaries;

• “AIHL” are to our wholly-owned insurance holding company subsidiary Alleghany Insurance Holdings LLC;

• “RSUI” are to our wholly-owned subsidiary RSUI Group, Inc. and its subsidiaries;

• “CapSpecialty” are to our wholly-owned subsidiary CapSpecialty, Inc. and its subsidiaries;

• “PacificComp” are to our former wholly-owned subsidiary Pacific Compensation Corporation and its subsidiary, which were sold on December 31, 2017;

• “AIHL Re” are to our wholly-owned subsidiary AIHL Re LLC;

• “Roundwood” are to our wholly-owned subsidiary Roundwood Asset Management LLC;

• “Alleghany Capital” are to our wholly-owned subsidiary Alleghany Capital Corporation and its subsidiaries;

• “SORC” are to our wholly-owned subsidiary Stranded Oil Resources Corporation and its subsidiaries;

• “Bourn & Koch” are to our majority-owned subsidiary Bourn & Koch, Inc. and its subsidiary;

• “Kentucky Trailer” are to our majority-owned subsidiary R.C. Tway Company, LLC and its subsidiaries;

• “IPS” are to our majority-owned subsidiary IPS-Integrated Project Services, LLC and its subsidiaries;

• “Jazwares” are to our majority-owned subsidiary Jazwares, LLC and its subsidiaries and affiliates;

• “W&W|AFCO Steel” are to our majority-owned subsidiary WWSC Holdings, LLC and its subsidiaries; and

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

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Note on Forward-Looking Statements

Certain statements contained in this Form 10-Q may be deemed to be “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the use of words such as “may,” “will,” “expect,” “project,” “estimate,” “anticipate,” “plan,” “believe,” “potential,” “should” or the negative versions of those words or other comparable words. Forward-looking statements do not relate solely to historical or current facts, rather they are based on management’s expectations as well as certain assumptions and estimates made by, and information available to, management at the time. These statements are not guarantees of future performance. These forward-looking statements are based upon Alleghany’s current expectations and are subject to a number of uncertainties and risks that could significantly affect current plans, anticipated actions and Alleghany’s future financial condition and results. Factors that could cause these forward-looking statements to differ, possibly materially, from that currently contemplated include:

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

• the cyclical nature of the property and casualty reinsurance and insurance industries;

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

• adverse loss development for events insured by our reinsurance and insurance subsidiaries in either the current year or prior years;

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

• the cost and availability of reinsurance;

• the reliance by our reinsurance and insurance operating subsidiaries on a limited number of brokers;

• legal, political, judicial and regulatory changes;

• increases in the levels of risk retention by our reinsurance and insurance subsidiaries;

• changes in the ratings assigned to our reinsurance and insurance subsidiaries;

• claims development and the process of estimating reserves;

• exposure to terrorist acts and acts of war;

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

• the uncertain nature of damage theories and loss amounts;

• the loss of key personnel of our reinsurance or insurance operating subsidiaries;

• fluctuation in foreign currency exchange rates;

• the failure to comply with the restrictive covenants contained in the agreements governing our indebtedness;

• the ability to make payments on, or repay or refinance, our debt;

• risks inherent in international operations; and

• difficult and volatile conditions in the global market.

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; changes in our plans, strategies, objectives, expectations, or intentions, which may happen at any time at our discretion; and other factors discussed in the 2017 Form 10-K and subsequent filings with the Securities and Exchange Commission, or the “SEC.” All forward-looking statements speak only as of the date they are made and are based on information available at that time. Alleghany does not undertake any obligation to update or revise any forward-looking statements to reflect subsequent circumstances or events. See Part I, Item 1A, “Risk Factors” of the 2017 Form 10-K for additional information.

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Comment on Non-GAAP Financial Measures

Throughout this Form 10-Q, our analysis of our financial condition and results of operations is based on our consolidated financial statements which have been prepared in accordance with accounting principles generally accepted in the U.S., or “GAAP.” Our results of operations have been presented in the way that we believe will be the most meaningful and useful to investors, analysts, rating agencies and others who use financial information in evaluating our performance. This presentation includes the use of underwriting profit and operating earnings before income taxes, which are “non-GAAP financial measures,” as such term is defined in Item 10(e) of Regulation S-K promulgated by the SEC. The presentation of these financial measures is not intended to be considered in isolation or as a substitute for, or superior to, financial information prepared and presented in accordance with GAAP. These measures may also be different from non-GAAP financial measures used by other companies, limiting their usefulness for comparison purposes. A discussion of our calculation and use of these financial measures is provided below.

Underwriting profit is a non-GAAP financial measure for our reinsurance and insurance segments. Underwriting profit represents net premiums earned less net loss and loss adjustment expenses, or “LAE,” and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP and does not include: (i) net investment income; (ii) change in the fair value of equity securities; (iii) net realized capital gains; (iv) other than temporary impairment, or “OTTI,” losses; (v) noninsurance revenue; (vi) other operating expenses; (vii) corporate administration; (viii) amortization of intangible assets; and (ix) interest expense. We use underwriting profit as a supplement to earnings before income taxes, the most comparable GAAP financial measure, to evaluate the performance of our reinsurance and insurance segments and believe that underwriting profit provides useful additional information to investors because it highlights net earnings attributable to our reinsurance and insurance segments’ underwriting performance. Earnings before income taxes may show a profit despite an underlying underwriting loss, and when underwriting losses persist over extended periods, a reinsurance or an insurance company’s ability to continue as an ongoing concern may be at risk. A reconciliation of underwriting profit to earnings before income taxes is presented within “Consolidated Results of Operations.”

Operating earnings before income taxes is a non-GAAP financial measure for our noninsurance operating subsidiaries and investments in the Alleghany Capital segment. Operating earnings before income taxes represents noninsurance revenue less all operating expenses, and does not include: (i) amortization of intangible assets; (ii) change in the fair value of equity securities; (iii) net realized capital gains; (iv) OTTI losses; and (v) income taxes. Because operating earnings before income taxes excludes income taxes, change in the fair value of equity securities, net realized capital gains, OTTI losses, and amortization of intangible assets, it provides an indication of economic performance that is not affected by investment activity, levels of effective tax rates or levels of amortization resulting from acquisition accounting. We use operating earnings before income taxes as a supplement to earnings before income taxes, the most comparable GAAP financial measure, to evaluate the performance of certain of our noninsurance operating subsidiaries and investments. A reconciliation of operating earnings before income taxes to earnings before income taxes is presented within “Consolidated Results of Operations.”

In prior filings, we have used Adjusted EBITDA as a non-GAAP financial measure for our noninsurance operating subsidiaries held by Alleghany Capital. We believe that operating earnings before income taxes is a more useful non-GAAP financial measure, as it reflects: (i) ongoing capital expenditures through the inclusion of depreciation expense (a component of other operating expenses); and (ii) ongoing levels of debt through the inclusion of interest expenses.

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Overview

The following overview does not address all of the matters covered in the other sections of Management’s Discussion and Analysis of Financial Condition and Results of Operations or contain all of the information that may be important to our stockholders or the investing public. This overview should be read in conjunction with the other sections of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

• Net earnings attributable to Alleghany stockholders were $295.1 million in the second quarter of 2018, compared with $101.8 million in the second quarter of 2017, an increase of 189.9 percent, and $466.7 million in the first six months of 2018, compared with $251.0 million in the first six months of 2017, an increase of 85.9 percent.

• Earnings before income taxes were $371.8 million in the second quarter of 2018, compared with $140.1 million in the second quarter of 2017, and $580.5 million in the first six months of 2018, compared with $348.0 million in the first six months of 2017.

• Net investment income increased by 24.2 percent and 15.3 percent in the second quarter and first six months of 2018, respectively, from the corresponding 2017 periods.

• Net premiums written decreased by 1.3 percent in the second quarter of 2018 from the second quarter of 2017, and net premiums written for the first six months of 2018 approximated those for the first six months of 2017.

• Underwriting profit was $96.7 million in the second quarter of 2018, compared with $95.3 million in the second quarter of 2017, and $227.6 million in the first six months of 2018, compared with $196.7 million in the first six months of 2017.

• The combined ratio for our reinsurance and insurance segments was 92.2 percent in the second quarter of 2018, compared with 92.4 percent in the second quarter of 2017, and 90.7 percent in the first six months of 2018, compared with 92.0 percent in the first six months of 2017.

• Catastrophe losses, net of reinsurance, were $14.3 million in the second quarter of 2018, compared with $11.4 million in the second quarter of 2017, and $18.4 million in the first six months of 2018, compared with $15.4 million in the first six months of 2017.

• Net favorable prior accident year loss reserve development was $52.2 million in the second quarter of 2018, compared with $63.6 million in the second quarter of 2017, and $137.9 million in the first six months of 2018, compared with $111.4 million in the first six months of 2017.

• Noninsurance revenues for Alleghany Capital were $329.0 million in the second quarter of 2018, compared with $192.8 million in the second quarter of 2017, and $571.7 million in the first six months of 2018, compared with $337.6 million in the first six months of 2017.

• Earnings before income taxes for Alleghany Capital were $7.5 million in the second quarter of 2018, compared with losses before income taxes of $2.2 million in the second quarter of 2017, and earnings before income taxes were $6.1 million in the first six months of 2018, compared with losses before income taxes of $3.9 million in the first six months of 2017. Operating earnings before income taxes were $13.4 million in the second quarter of 2018, compared with $2.6 million in the second quarter of 2017, and $16.8 million in the first six months of 2018, compared with $5.3 million in the first six months of 2017.

As of June 30, 2018, we had total assets of $25.1 billion and total stockholders’ equity attributable to Alleghany stockholders of $8.4 billion. As of June 30, 2018, we had consolidated total investments of approximately $18.6 billion, consisting of $12.1 billion invested in debt securities, $4.7 billion invested in equity securities, $0.5 billion invested in short-term investments, $0.7 billion invested in commercial mortgage loans and $0.6 billion invested in other invested assets.

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Consolidated Results of Operations

The following table presents our consolidated revenues, costs and expenses and earnings:

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018		2017			2018			2017
	($ in millions)
Revenues
Net premiums earned	$	1,237.0	$	1,243.9		$	2,444.8		$	2,453.1
Net investment income		126.3		101.7			250.4			217.2
Change in the fair value of equity securities		185.2		-			142.6			-
Net realized capital gains		6.5		9.3			51.0			68.9
Other than temporary impairment losses		-		(3.8	)		(0.5	)		(7.0	)
Noninsurance revenue		342.7		202.8			594.4			354.1
Total revenues		1,897.7		1,553.9			3,482.7			3,086.3
Costs and Expenseses
Net loss and loss adjustment expenses		738.2		734.9			1,408.8			1,434.2
Commissions, brokerage and other underwriting expenses		402.1		413.7			808.4			822.2
Other operating expenses		343.2		225.2			608.1			400.3
Corporate administration		14.1		14.4			21.9			31.3
Amortization of intangible assets		6.0		4.6			11.2			8.4
Interest expense		22.3		21.0			43.8			41.9
Total costs and expenses		1,525.9		1,413.8			2,902.2			2,738.3
Earnings before income taxes		371.8		140.1			580.5			348.0
Income taxes		73.4		37.4			110.9			96.0
Net earnings		298.4		102.7			469.6			252.0
Net earnings attributable to noncontrolling interests		3.3		0.9			2.9			1.0
Net earnings attributable to Alleghany stockholders	$	295.1	$	101.8		$	466.7		$	251.0

Alleghany’s segments are reported in a manner consistent with the way management evaluates the business. As such, Alleghany classifies its business into three reportable segments – reinsurance, insurance and Alleghany Capital. Alleghany determined that Alleghany Capital qualified as a reportable segment in the first quarter of 2018, reflecting the increased significance of Alleghany Capital’s business to Alleghany and its projected growth. Corporate activities are not classified as a segment.

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See Note 10 to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional detail on our segments and other activities. The tables below present the results for our segments and for other activities for the three and six months ended June 30, 2018 and 2017.

	Segments
Three Months Ended June 30, 2018	Reinsurance Segment			Insurance Segment			Subtotal			Alleghany Capital			Total Segments			Corporate Activities(1)			Consolidated
	($ in millions)
Gross premiums written	$	1,071.7		$	407.5		$	1,479.2		$	-		$	1,479.2		$	(6.5	)	$	1,472.7
Net premiums written		976.6			299.2			1,275.8			-			1,275.8			-			1,275.8
Net premiums earned		981.3			255.7			1,237.0			-			1,237.0			-			1,237.0
Net loss and LAE:
Current year (excluding catastrophe losses)		644.2			131.9			776.1			-			776.1			-			776.1
Current year catastrophe losses		-			14.3			14.3			-			14.3			-			14.3
Prior years		(50.7	)		(1.5	)		(52.2	)		-			(52.2	)		-			(52.2	)
Total net loss and LAE		593.5			144.7			738.2			-			738.2			-			738.2
Commissions, brokerage and other underwriting expenses		318.0			84.1			402.1			-			402.1			-			402.1
Underwriting profit(2)	$	69.8		$	26.9			96.7			-			96.7			-			96.7
Net investment income								121.1			1.2			122.3			4.0			126.3
Change in the fair value of equity securities								146.8			-			146.8			38.4			185.2
Net realized capital gains								6.8			(0.1	)		6.7			(0.2	)		6.5
Other than temporary impairment losses								-			-			-			-			-
Noninsurance revenue								4.7			329.0			333.7			9.0			342.7
Other operating expenses								19.9			314.5			334.4			8.8			343.2
Corporate administration								0.8			-			0.8			13.3			14.1
Amortization of intangible assets								0.2			5.8			6.0			-			6.0
Interest expense								6.9			2.3			9.2			13.1			22.3
Earnings before income taxes							$	348.3		$	7.5		$	355.8		$	16.0		$	371.8
Loss ratio(3):
Current year (excluding catastrophe losses)		65.6	%		51.6	%		62.7	%
Current year catastrophe losses		-	%		5.6	%		1.2	%
Prior years		(5.2	%)		(0.6	%)		(4.2	%)
Total net loss and LAE		60.4	%		56.6	%		59.7	%
Expense ratio(4)		32.4	%		32.9	%		32.5	%
Combined ratio(5)		92.8	%		89.5	%		92.2	%

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	Segments
Three Months Ended June 30, 2017	Reinsurance Segment			Insurance Segment			Subtotal			Alleghany Capital			Total Segments			Corporate Activities(1)			Consolidated
	($ in millions)
Gross premiums written	$	1,045.4		$	410.3		$	1,455.7		$	-		$	1,455.7		$	(5.7	)	$	1,450.0
Net premiums written		978.8			314.3			1,293.1			-			1,293.1			-			1,293.1
Net premiums earned		957.4			286.5			1,243.9			-			1,243.9			-			1,243.9
Net loss and LAE:
Current year (excluding catastrophe losses)		625.6			161.5			787.1			-			787.1			-			787.1
Current year catastrophe losses		-			11.4			11.4			-			11.4			-			11.4
Prior years		(52.6	)		(11.0	)		(63.6	)		-			(63.6	)		-			(63.6	)
Total net loss and LAE		573.0			161.9			734.9			-			734.9			-			734.9
Commissions, brokerage and other underwriting expenses		322.2			91.5			413.7			-			413.7			-			413.7
Underwriting profit(2)	$	62.2		$	33.1			95.3			-			95.3			-			95.3
Net investment income								98.0			0.2			98.2			3.5			101.7
Change in the fair value of equity securities								-			-			-			-			-
Net realized capital gains								9.2			0.2			9.4			(0.1	)		9.3
Other than temporary impairment losses								(3.8	)		-			(3.8	)		-			(3.8	)
Noninsurance revenue								3.3			192.8			196.1			6.7			202.8
Other operating expenses								25.9			189.4			215.3			9.9			225.2
Corporate administration								0.8			-			0.8			13.6			14.4
Amortization of intangible assets								(0.4	)		5.0			4.6			-			4.6
Interest expense								6.8			1.0			7.8			13.2			21.0
Earnings (losses) before income taxes							$	168.9		$	(2.2	)	$	166.7		$	(26.6	)	$	140.1
Loss ratio(3):
Current year (excluding catastrophe losses)		65.4	%		56.3	%		63.3	%
Current year catastrophe losses		-	%		4.0	%		0.9	%
Prior years		(5.5	%)		(3.8	%)		(5.1	%)
Total net loss and LAE		59.9	%		56.5	%		59.1	%
Expense ratio(4)		33.6	%		31.9	%		33.3	%
Combined ratio(5)		93.5	%		88.4	%		92.4	%

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	Segments
Six Months Ended June 30, 2018	Reinsurance Segment			Insurance Segment			Subtotal			Alleghany Capital		Total Segments			Corporate Activities(1)			Consolidated
	($ in millions)
Gross premiums written	$	2,187.3		$	756.6		$	2,943.9		$	-	$	2,943.9		$	(12.4	)	$	2,931.5
Net premiums written		1,973.7			555.5			2,529.2			-		2,529.2			-			2,529.2
Net premiums earned		1,941.5			503.3			2,444.8			-		2,444.8			-			2,444.8
Net loss and LAE:
Current year (excluding catastrophe losses)		1,255.2			273.1			1,528.3			-		1,528.3			-			1,528.3
Current year catastrophe losses		-			18.4			18.4			-		18.4			-			18.4
Prior years		(122.3	)		(15.6	)		(137.9	)		-		(137.9	)		-			(137.9	)
Total net loss and LAE		1,132.9			275.9			1,408.8			-		1,408.8			-			1,408.8
Commissions, brokerage and other underwriting expenses		640.0			168.4			808.4			-		808.4			-			808.4
Underwriting profit(2)	$	168.6		$	59.0			227.6			-		227.6			-			227.6
Net investment income								239.4			3.1		242.5			7.9			250.4
Change in the fair value of equity securities								132.7			-		132.7			9.9			142.6
Net realized capital gains								50.7			0.5		51.2			(0.2	)		51.0
Other than temporary impairment losses								(0.5	)		-		(0.5	)		-			(0.5	)
Noninsurance revenue								10.4			571.7		582.1			12.3			594.4
Other operating expenses								37.0			554.4		591.4			16.7			608.1
Corporate administration								0.5			-		0.5			21.4			21.9
Amortization of intangible assets								-			11.2		11.2			-			11.2
Interest expense								13.6			3.6		17.2			26.6			43.8
Earnings (losses) before income taxes							$	609.2		$	6.1	$	615.3		$	(34.8	)	$	580.5
Loss ratio(3):
Current year (excluding catastrophe losses)		64.7	%		54.3	%		62.5	%
Current year catastrophe losses		-	%		3.6	%		0.8	%
Prior years		(6.3	%)		(3.1	%)		(5.7	%)
Total net loss and LAE		58.4	%		54.8	%		57.6	%
Expense ratio(4)		33.0	%		33.5	%		33.1	%
Combined ratio(5)		91.4	%		88.3	%		90.7	%

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	Segments
Six Months Ended June 30, 2017	Reinsurance Segment			Insurance Segment			Subtotal			Alleghany Capital			Total Segments			Corporate Activities(1)			Consolidated
	($ in millions)
Gross premiums written	$	2,101.1		$	781.0		$	2,882.1		$	-		$	2,882.1		$	(11.2	)	$	2,870.9
Net premiums written		1,928.2			598.0			2,526.2			-			2,526.2			-			2,526.2
Net premiums earned		1,883.5			569.6			2,453.1			-			2,453.1			-			2,453.1
Net loss and LAE:
Current year (excluding catastrophe losses)		1,221.0			309.2			1,530.2			-			1,530.2			-			1,530.2
Current year catastrophe losses		-			15.4			15.4			-			15.4			-			15.4
Prior years		(90.9	)		(20.5	)		(111.4	)		-			(111.4	)		-			(111.4	)
Total net loss and LAE		1,130.1			304.1			1,434.2			-			1,434.2			-			1,434.2
Commissions, brokerage and other underwriting expenses		637.7			184.5			822.2			-			822.2			-			822.2
Underwriting profit(2)	$	115.7		$	81.0			196.7			-			196.7			-			196.7
Net investment income								210.3			0.5			210.8			6.4			217.2
Change in the fair value of equity securities								-			-			-			-			-
Net realized capital gains								69.4			0.1			69.5			(0.6	)		68.9
Other than temporary impairment losses								(7.0	)		-			(7.0	)		-			(7.0	)
Noninsurance revenue								5.8			337.6			343.4			10.7			354.1
Other operating expenses								49.1			331.0			380.1			20.2			400.3
Corporate administration								1.6			-			1.6			29.7			31.3
Amortization of intangible assets								(0.9	)		9.3			8.4			-			8.4
Interest expense								13.6			1.8			15.4			26.5			41.9
Earnings (losses) before income taxes							$	411.8		$	(3.9	)	$	407.9		$	(59.9	)	$	348.0
Loss ratio(3):
Current year (excluding catastrophe losses)		64.8	%		54.3	%		62.4	%
Current year catastrophe losses		-	%		2.7	%		0.6	%
Prior years		(4.8	%)		(3.6	%)		(4.5	%)
Total net loss and LAE		60.0	%		53.4	%		58.5	%
Expense ratio(4)		33.9	%		32.4	%		33.5	%
Combined ratio(5)		93.9	%		85.8	%		92.0	%

(1) Includes elimination of minor reinsurance activity between segments.

(2) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, OTTI losses, noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets and interest expense. Underwriting profit is a non-GAAP financial measure and does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. See “Comment on Non-GAAP Financial Measures” herein for additional detail on the presentation of our results of operations.

(3) The loss ratio is derived by dividing the amount of net loss and LAE by net premiums earned, all as determined in accordance with GAAP.

(4) The expense ratio is derived by dividing the amount of commissions, brokerage and other underwriting expenses by net premiums earned, all as determined in accordance with GAAP.

(5) The combined ratio is the sum of the loss ratio and the expense ratio, all as determined in accordance with GAAP. The combined ratio represents the percentage of each premium dollar a reinsurance or an insurance company has to spend on net loss and LAE, and commissions, brokerage and other underwriting expenses.

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Comparison of the Three and Six Months Ended June 30, 2018 and 2017

Premiums. The following table presents our consolidated premiums:

	Three Months Ended							Six Months Ended
	June 30,							June 30,
	2018		2017		Percent Change			2018		2017		Percent Change
	($ in millions)
Premiums written:
Gross premiums written	$	1,472.7	$	1,450.0		1.6	%	$	2,931.5	$	2,870.9		2.1	%
Net premiums written		1,275.8		1,293.1		(1.3	%)		2,529.2		2,526.2		0.1	%
Net premiums earned		1,237.0		1,243.9		(0.6	%)		2,444.8		2,453.1		(0.3	%)

The increases in gross premiums written in the second quarter and first six months of 2018 from the corresponding 2017 periods are primarily attributable to increases at our reinsurance segment, as well as growth at CapSpecialty and, to a lesser extent, RSUI, partially offset by the impact of the sale of PacificComp. The increases at our reinsurance segment primarily reflect increases in casualty premiums written by the European and Asia-Pacific operations and the impact of changes in foreign currency exchange rates. In addition, gross premiums written related to a certain large whole account quota share treaty, or the “Quota Share Treaty,” increased to $187.7 million in the second quarter of 2018 from $183.9 million in the second quarter of 2017, and decreased to $371.7 million in the first six months of 2018 from $374.1 million in the first six months of 2017.

The decrease in net premiums written in the second quarter of 2018 from the second quarter of 2017 primarily reflects higher ceded premiums written due to an increase in retrocessional coverage purchased in 2018 at our reinsurance segment, partially offset by increases in gross premiums written, as discussed above.

The decreases in net premiums earned in the second quarter and first six months of 2018 from the corresponding 2017 periods are primarily attributable to decreases at our insurance segment due to the impact of sale of PacificComp, partially offset by increases at our reinsurance segment due mainly to increases in gross premiums written in recent quarters, partially offset by higher ceded premiums earned due to an increase in retrocessional coverage purchased in 2018.

A detailed comparison of premiums by segment for the second quarter and first six months of 2018 and 2017 is contained in the following pages.

Net loss and LAE. The following table presents our consolidated net loss and LAE:

	Three Months Ended									Six Months Ended
	June 30,									June 30,
	2018			2017			Percent Change			2018			2017			Percent Change
	($ in millions)
Net loss and LAE:
Current year (excluding catastrophe losses)	$	776.1		$	787.1			(1.4%	)	$	1,528.3		$	1,530.2			(0.1%	)
Current year catastrophe losses		14.3			11.4			25.4%			18.4			15.4			19.5%
Prior years		(52.2)			(63.6)			(17.9%	)		(137.9)			(111.4)			23.8%
Total net loss and LAE	$	738.2		$	734.9			0.4%		$	1,408.8		$	1,434.2			(1.8%	)
Loss ratio:
Current year (excluding catastrophe losses)		62.7%			63.3%						62.5%			62.4%
Current year catastrophe losses		1.2%			0.9%						0.8%			0.6%
Prior years		(4.2%	)		(5.1%	)					(5.7%	)		(4.5%	)
Total net loss and LAE		59.7%			59.1%						57.6%			58.5%

The increase in net loss and LAE in the second quarter of 2018 from the second quarter of 2017 primarily reflects an increase at our reinsurance segment, due to the impact of an increase in net premiums earned, partially offset by a decrease at our insurance segment. The decrease at our insurance segment is due to the impact of the sale of PacificComp, partially offset by a decrease in favorable prior accident year loss reserve development and higher catastrophe losses incurred at RSUI.

The decrease in net loss and LAE in the first six months of 2018 from the first six months of 2017 primarily reflects a decrease at our insurance segment, partially offset by a slight increase at our reinsurance segment. The decrease in our insurance segment primarily reflects the impact of the sale of PacificComp, partially offset by a decrease in favorable prior accident year loss reserve development and higher catastrophe losses incurred at RSUI. The slight increase at our reinsurance segment primarily reflects the

34

impact of an increase in net premiums earned, partially offset by an increase in favorable prior accident year loss reserve development.

Net loss and LAE in the first six months of 2017 for the reinsurance segment includes $24.4 million of unfavorable prior accident year loss reserve development related to the U.K. Ministry of Justice’s significant reduction in the discount rate, referred to as the Ogden rate, used to calculate lump-sum bodily injury payouts in personal injury insurance claims in the U.K.

A detailed comparison of net loss and LAE by segment for the second quarter and first six months of 2018 and 2017 is contained in the following pages.

Commissions, brokerage and other underwriting expenses. The following table presents our consolidated commissions, brokerage and other underwriting expenses:

	Three Months Ended							Six Months Ended
	June 30,							June 30,
	2018		2017		Percent Change			2018		2017		Percent Change
	($ in millions)
Commissions, brokerage and other underwriting expenses	$	402.1	$	413.7		(2.8%	)	$	808.4	$	822.2	(1.7%)
Expense ratio		32.5%		33.3%					33.1%		33.5%
The decreases in commissions, brokerage and other underwriting expenses in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect decreases at our insurance segment due to the impact of the sale of PacificComp, partially offset by increases at CapSpecialty due primarily to the impact of higher net premiums earned. A detailed comparison of commissions, brokerage and other underwriting expenses by segment for the three and six months ended June 30, 2018 and 2017 is contained in the following pages. Underwriting profit. The following table presents our consolidated underwriting profit:
	Three Months Ended							Six Months Ended
	June 30,							June 30,
	2018		2017		Percent Change			2018		2017		Percent Change
	($ in millions)
Underwriting profit	$	96.7	$	95.3		1.5%		$	227.6	$	196.7	15.7%
Combined ratio		92.2%		92.4%					90.7%		92.0%
The increases in underwriting profit in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases at our reinsurance segment, partially offset by decreases at our insurance segment. The increases at our reinsurance segment primarily reflect the impact of increases in net premiums earned and, for the first six months of 2018, an increase in favorable prior accident year loss reserve development, all as discussed above. The decreases at our insurance segment primarily reflect decreases in favorable prior accident year loss reserve development and higher catastrophe losses incurred at RSUI, all as discussed above. A detailed comparison of underwriting profit by segment for the three and six months ended June 30, 2018 and 2017 is contained in the following pages. Investment results. The following table presents our consolidated investment results:
	Three Months Ended							Six Months Ended
	June 30,							June 30,
	2018		2017		Percent Change			2018		2017		Percent Change
	($ in millions)
Net investment income	$	126.3	$	101.7		24.2%		$	250.4	$	217.2	15.3%
Change in the fair value of equity securities		185.2		-		-			142.6		-	-
Net realized capital gains		6.5		9.3		(30.1%	)		51.0		68.9	(26.0%)
Other than temporary impairment losses		-		(3.8)		(100.0%	)		(0.5)		(7.0)	(92.9%)

The increases in net investment income in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases in dividend income resulting from an increase in the size of the equity securities portfolio and higher interest income. The increase in interest income primarily reflects higher yields on short-term investments and floating-rate debt securities and higher income from funds withheld, partially offset by the impact of the sale of PacificComp.

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In addition, net investment income in the second quarter and first six months of 2018 reflects higher partnership income at AIHL. AIHL’s partnership income in the first six months of 2018 includes a $12.9 million increase in the carrying value of AIHL’s limited partnership interests in certain subsidiaries of Ares Management LLC, or “Ares,” as of March 15, 2018. See Note 3(h) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information. Partnership income in the second quarter and first six months of 2017 includes a $12.6 million charge on our equity investment in Ares, reflecting our share of a one-time payment recorded by Ares related to an acquisition by its affiliated entity. In connection with this acquisition, Ares agreed to make certain transaction support payments to the sellers of the acquired entity.

In the first quarter of 2018, we adopted new investment accounting guidance which required changes in the fair value of equity securities, except those accounted for under the equity method, to be recognized in net earnings. In earlier periods, equity securities were considered to be available-for-sale, or “AFS,” and were included in the analysis of OTTI. See Note 1(c) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information regarding our adoption of this new guidance.

The changes in the fair value of equity securities in the second quarter and first six months of 2018 reflect appreciation in the value of our equity securities portfolio, primarily from our holdings in the technology, industrial and energy sectors.

The decreases in net realized capital gains in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect a lack of net realized capital gains from equity securities in the 2018 periods resulting from our adoption of the new investment accounting guidance discussed above. The decrease for the first six months of 2018 was partially offset by a $45.7 million gain on AIHL’s conversion of most of its limited partnership interests in certain subsidiaries of Ares into Ares common units. See Note 3(h) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information on AIHL’s conversion.

The absence of OTTI losses in the second quarter of 2018, compared with OTTI losses in the second quarter of 2017, and the decrease in OTTI losses in the first six months of 2018 from the first six months of 2017, primarily reflect an absence of impairments from equity securities in the 2018 periods resulting from our adoption of the new investment accounting guidance, as discussed above.

A detailed comparison of investment results for the three and six months ended June 30, 2018 and 2017 is contained in the following pages.

Noninsurance revenue and expenses. The following table presents our consolidated noninsurance revenue and expenses:

	Three Months Ended							Six Months Ended
	June 30,							June 30,
	2018		2017		Percent Change			2018		2017		Percent Change
	($ in millions)
Noninsurance revenue	$	342.7	$	202.8		69.0%		$	594.4	$	354.1		67.9%
Other operating expenses		343.2		225.2		52.4%			608.1		400.3		51.9%
Corporation administration		14.1		14.4		(2.1%	)		21.9		31.3		(30.0%	)
Amortization of intangible assets		6.0		4.6		30.4%			11.2		8.4		33.3%
Interest expense		22.3		21.0		6.2%			43.8		41.9		4.5%

Noninsurance revenue and Other operating expenses. Noninsurance revenue and other operating expenses primarily include sales and expenses associated with our Alleghany Capital segment. Other operating expenses also include the long-term incentive compensation of our reinsurance and insurance segments, which totaled $18.1 million and $23.6 million in the second quarter of 2018 and 2017, respectively, and $32.4 million and $45.0 million in the first six months of 2018 and 2017, respectively. The decreases in long-term incentive compensation at our reinsurance and insurance segments in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect the impact of a decline in unrealized appreciation on our debt securities portfolio in the first six months of 2018 on incentive compensation expense accruals at TransRe and RSUI.

On April 28, 2017, Alleghany Capital acquired approximately 80 percent of the equity in W&W|AFCO Steel. On February 7, 2018, W&W|AFCO Steel acquired the outstanding equity of Hirschfeld Holdings, LP, or “Hirschfeld,” a fabricator of steel bridges and structural steel for stadiums, airports and other large commercial and industrial projects, for $111.3 million.

The increases in noninsurance revenue and other operating expenses in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect the acquisitions of W&W|AFCO Steel and Hirschfeld.

Corporate administration. The decrease in corporate administration expense in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflects a decrease in Alleghany’s long-term incentive compensation expense accruals due to the impact of a decline in unrealized appreciation on our debt securities portfolio in the first six months of 2018.

36

Amortization of intangible assets. The increases in amortization expense in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect the amortization of net intangible assets related to the acquisition of W&W|AFCO Steel and, to a lesser extent, Hirschfeld.

Interest expense. The increases in interest expense in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect borrowings at W&W|AFCO Steel and Hirschfeld.

A detailed comparison of noninsurance revenues and expenses for the three and six months ended June 30, 2018 and 2017 is contained in the following pages.

Income taxes. The following table presents our consolidated income tax expense:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018		2017		Percent Change		2018		2017		Percent Change
	($ in millions)
Income taxes	$	73.4	$	37.4		96.3%	$	110.9	$	96.0		15.5%
Effective tax rate								19.1%		27.6%

The increases in income taxes in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases in earnings before income taxes, partially offset by lower effective tax rates. The decrease in the effective tax rate in first six months of 2018 from the first six months of 2017 primarily reflects the decrease in the U.S. corporate federal income tax rate from 35.0 percent to 21.0 percent due to the Tax Cuts and Jobs Act of 2017, or the “Tax Act,” partially offset by new limitations on certain deductions as a result of the Tax Act.

Net earnings. The following table presents our consolidated earnings:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018		2017		Percent Change		2018		2017		Percent Change
	($ in millions)
Earnings before income taxes	$	371.8	$	140.1		165.4%	$	580.5	$	348.0		66.8%
Net earnings attributable to Alleghany stockholders		295.1		101.8		189.9%		466.7		251.0		85.9%

The increases in earnings before income taxes in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect appreciation in the value of our equity securities portfolio resulting from our adoption of new investment accounting guidance in 2018 and, to a lesser extent, increases in net investment income, all as discussed above. In addition, the increase in earnings before income taxes in the first six months of 2018 from the first six months of 2017 also reflects an increase in underwriting profit, partially offset by a decrease in net realized capital gains, all as discussed above.

The increases in net earnings attributable to Alleghany stockholders in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases in earnings before income taxes and lower effective income tax rates, all as discussed above.

37

Reinsurance Segment Underwriting Results

The reinsurance segment is comprised of TransRe’s property and casualty & other lines of business. TransRe also writes a modest amount of property and casualty insurance business, which is included in the reinsurance segment. For a more detailed description of our reinsurance segment, see Part I, Item 1, “Business—Segment Information—Reinsurance Segment” of the 2017 Form 10-K.

The underwriting results of the reinsurance segment are presented below.

Three Months Ended June 30, 2018	Property			Casualty & Other(1)			Total
	($ in millions)
Gross premiums written	$	345.1		$	726.6		$	1,071.7
Net premiums written		275.9			700.7			976.6
Net premiums earned		292.1			689.2			981.3
Net loss and LAE:
Current year (excluding catastrophe losses)		167.2			477.0			644.2
Current year catastrophe losses		-			-			-
Prior years		(13.7	)		(37.0	)		(50.7	)
Total net loss and LAE		153.5			440.0			593.5
Commissions, brokerage and other underwriting expenses		94.8			223.2			318.0
Underwriting profit(2)	$	43.8		$	26.0		$	69.8
Loss ratio(3):
Current year (excluding catastrophe losses)		57.2	%		69.2	%		65.6	%
Current year catastrophe losses		-	%		-	%		-	%
Prior years		(4.7	%)		(5.4	%)		(5.2	%)
Total net loss and LAE		52.5	%		63.8	%		60.4	%
Expense ratio(4)		32.5	%		32.4	%		32.4	%
Combined ratio(5)		85.0	%		96.2	%		92.8	%
Three Months Ended June 30, 2017	Property			Casualty & Other(1)			Total
	($ in millions)
Gross premiums written	$	369.1		$	676.3		$	1,045.4
Net premiums written		317.2			661.6			978.8
Net premiums earned		270.5			686.9			957.4
Net loss and LAE:
Current year (excluding catastrophe losses)		145.8			479.8			625.6
Current year catastrophe losses		-			-			-
Prior years		(22.9	)		(29.7	)		(52.6	)
Total net loss and LAE		122.9			450.1			573.0
Commissions, brokerage and other underwriting expenses		87.9			234.3			322.2
Underwriting profit(2)	$	59.7		$	2.5		$	62.2
Loss ratio(3):
Current year (excluding catastrophe losses)		53.9%			69.9%			65.4	%
Current year catastrophe losses		-   %			-   %			-	%
Prior years		(8.5%	)		(4.3%	)		(5.5	%)
Total net loss and LAE		45.4%			65.6%			59.9	%
Expense ratio(4)		32.5%			34.1%			33.6	%
Combined ratio(5)		77.9%			99.7%			93.5	%

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Six Months Ended June 30, 2018	Property			Casualty & Other(1)			Total
	($ in millions)
Gross premiums written	$	742.3		$	1,445.0		$	2,187.3
Net premiums written		581.0			1,392.7			1,973.7
Net premiums earned		567.2			1,374.3			1,941.5
Net loss and LAE:
Current year (excluding catastrophe losses)		305.2			950.0			1,255.2
Current year catastrophe losses		-			-			-
Prior years		(55.1	)		(67.2	)		(122.3	)
Total net loss and LAE		250.1			882.8			1,132.9
Commissions, brokerage and other underwriting expenses		187.9			452.1			640.0
Underwriting profit(2)	$	129.2		$	39.4		$	168.6
Loss ratio(3):
Current year (excluding catastrophe losses)		53.8	%		69.1	%		64.7	%
Current year catastrophe losses		-	%		-	%		-	%
Prior years		(9.7	%)		(4.9	%)		(6.3	%)
Total net loss and LAE		44.1	%		64.2	%		58.4	%
Expense ratio(4)		33.1	%		32.9	%		33.0	%
Combined ratio(5)		77.2	%		97.1	%		91.4	%
Six Months Ended June 30, 2017	Property			Casualty & Other(1)			Total
	($ in millions)
Gross premiums written	$	744.5		$	1,356.6		$	2,101.1
Net premiums written		602.4			1,325.8			1,928.2
Net premiums earned		557.3			1,326.2			1,883.5
Net loss and LAE:
Current year (excluding catastrophe losses)		299.1			921.9			1,221.0
Current year catastrophe losses		-			-			-
Prior years		(54.4	)		(36.5	)		(90.9	)
Total net loss and LAE		244.7			885.4			1,130.1
Commissions, brokerage and other underwriting expenses		178.7			459.0			637.7
Underwriting profit (loss)(2)	$	133.9		$	(18.2	)	$	115.7
Loss ratio(3):
Current year (excluding catastrophe losses)		53.7	%		69.5	%		64.8	%
Current year catastrophe losses		-	%		-	%		-	%
Prior years		(9.8	%)		(2.8	%)		(4.8	%)
Total net loss and LAE		43.9	%		66.7	%		60.0	%
Expense ratio(4)		32.1	%		34.6	%		33.9	%
Combined ratio(5)		76.0	%		101.3	%		93.9	%

(1) Primarily consists of the following assumed reinsurance lines of business: directors’ and officers’ liability; errors and omissions liability; general liability; medical malpractice; ocean marine and aviation; auto liability; accident and health; surety; and credit.

(2) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, OTTI losses, noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets and interest expense. Underwriting profit is a non-GAAP financial measure and does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. See “Comment on Non-GAAP Financial Measures” herein for additional detail on the presentation of our results of operations.

(3) The loss ratio is derived by dividing the amount of net loss and LAE by net premiums earned, all as determined in accordance with GAAP.

(4) The expense ratio is derived by dividing the amount of commissions, brokerage and other underwriting expenses by net premiums earned, all as determined in accordance with GAAP.

(5) The combined ratio is the sum of the loss ratio and the expense ratio, all as determined in accordance with GAAP. The combined ratio represents the percentage of each premium dollar a reinsurance or an insurance company has to spend on net loss and LAE, and commissions, brokerage and other underwriting expenses.

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Reinsurance Segment: Premiums. The following table presents premiums for the reinsurance segment:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018		2017		Percent Change		2018		2017		Percent Change
	($ in millions)
Property
Premiums written:
Gross premiums written	$	345.1	$	369.1		(6.5%)	$	742.3	$	744.5		(0.3%)
Net premiums written		275.9		317.2		(13.0%)		581.0		602.4		(3.6%)
Net premiums earned		292.1		270.5		8.0%		567.2		557.3		1.8%
Casualty & other
Premiums written:
Gross premiums written	$	726.6	$	676.3		7.4%	$	1,445.0	$	1,356.6		6.5%
Net premiums written		700.7		661.6		5.9%		1,392.7		1,325.8		5.0%
Net premiums earned		689.2		686.9		0.3%		1,374.3		1,326.2		3.6%
Total
Premiums written:
Gross premiums written	$	1,071.7	$	1,045.4		2.5%	$	2,187.3	$	2,101.1		4.1%
Net premiums written		976.6		978.8		(0.2%)		1,973.7		1,928.2		2.4%
Net premiums earned		981.3		957.4		2.5%		1,941.5		1,883.5		3.1%

Property. The decreases in gross premiums written in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect a decline in property-related premiums written related to the Quota Share Treaty, partially offset by the impact of changes in foreign currency exchange rates and, for the first six months of 2018, an increase in premiums written by the U.S. operations (excluding the Quota Share Treaty). Gross premiums written related to the Quota Share Treaty were $41.3 million and $62.9 million in the second quarter of 2018 and 2017, respectively, and $110.6 million and $170.7 million in the first six months of 2018 and 2017, respectively. Excluding the impact of changes in foreign currency exchange rates, gross premiums written decreased 7.0 percent and 1.8 percent, respectively, in the second quarter and first six months of 2018 from the corresponding 2017 periods.

The increases in net premiums earned in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect the impact of changes in foreign currency exchange rates and an increase in gross premiums written in recent quarters, partially offset by higher ceded premiums earned due to an increase in retrocessional coverage purchased. Excluding the impact of changes in foreign currency exchange rates, net premiums earned increased 7.4 percent in the second quarter of 2018 and net premiums earned in the first six months of 2018 approximated net premiums earned in the first six months of 2017.

Casualty & other. The increases in gross premiums written in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases in premiums written by the European and Asia-Pacific operations, increases in casualty-related premiums written related to the Quota Share Treaty and the impact of changes in foreign currency exchange rates. Gross premiums written related to the Quota Share Treaty were $146.4 million and $121.0 million in the second quarter of 2018 and 2017, respectively, and $261.1 million and $203.4 million in the first six months of 2018 and 2017, respectively. Excluding the impact of changes in foreign currency exchange rates, gross premiums written increased 6.9 percent and 5.1 percent, respectively, in the second quarter and first six months of 2018 from the corresponding 2017 periods.

The increase in net premiums earned in the first six months of 2018 from the first six months of 2017 primarily reflects an increase in gross premiums written in recent quarters and the impact of changes in foreign currency exchange rates, partially offset by higher ceded premiums earned due to an increase in retrocessional coverage purchased. Excluding the impact of changes in foreign currency exchange rates, net premiums earned increased 2.3 percent in the first six months of 2018 from the first six months of 2017.

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Reinsurance Segment: Net loss and LAE. The following table presents net loss and LAE for the reinsurance segment:

	Three Months Ended									Six Months Ended
	June 30,									June 30,
	2018			2017			Percent Change			2018			2017			Percent Change
	($ in millions)
Property
Net loss and LAE:
Current year (excluding catastrophe losses)	$	167.2		$	145.8			14.7	%	$	305.2		$	299.1			2.0	%
Current year catastrophe losses		-			-			-			-			-			-
Prior years		(13.7	)		(22.9	)		(40.2	%)		(55.1	)		(54.4	)		1.3	%
Total net loss and LAE	$	153.5		$	122.9			24.9	%	$	250.1		$	244.7			2.2	%
Loss ratio:
Current year (excluding catastrophe losses)		57.2	%		53.9	%					53.8	%		53.7	%
Current year catastrophe losses		-	%		-	%					-	%		-	%
Prior years		(4.7	%)		(8.5	%)					(9.7	%)		(9.8	%)
Total net loss and LAE		52.5	%		45.4	%					44.1	%		43.9	%
Casualty & other
Net loss and LAE:
Current year (excluding catastrophe losses)	$	477.0		$	479.8			(0.6	%)	$	950.0		$	921.9			3.0	%
Current year catastrophe losses		-			-			-			-			-			-
Prior years		(37.0	)		(29.7	)		24.6	%		(67.2	)		(36.5	)		84.1	%
Total net loss and LAE	$	440.0		$	450.1			(2.2	%)	$	882.8		$	885.4			(0.3	%)
Loss ratio:
Current year (excluding catastrophe losses)		69.2	%		69.9	%					69.1	%		69.5	%
Current year catastrophe losses		-	%		-	%					-	%		-	%
Prior years		(5.4	%)		(4.3	%)					(4.9	%)		(2.8	%)
Total net loss and LAE		63.8	%		65.6	%					64.2	%		66.7	%
Total
Net loss and LAE:
Current year (excluding catastrophe losses)	$	644.2		$	625.6			3.0	%	$	1,255.2		$	1,221.0			2.8	%
Current year catastrophe losses		-			-			-			-			-			-
Prior years		(50.7	)		(52.6	)		(3.6	%)		(122.3	)		(90.9	)		34.5	%
Total net loss and LAE	$	593.5		$	573.0			3.6	%	$	1,132.9		$	1,130.1			0.2	%
Loss ratio:
Current year (excluding catastrophe losses)		65.6	%		65.4	%					64.7	%		64.8	%
Current year catastrophe losses		-	%		-	%					-	%		-	%
Prior years		(5.2	%)		(5.5	%)					(6.3	%)		(4.8	%)
Total net loss and LAE		60.4	%		59.9	%					58.4	%		60.0	%

Property. The increase in net loss and LAE in the second quarter of 2018 from the second quarter of 2017 primarily reflects a decrease in favorable prior accident year loss reserve development, the impact of higher net premiums earned and higher non-catastrophe losses. The increase in net loss and LAE in the first six months of 2018 from the first six months of 2017 primarily reflects the impact of higher net premiums earned. There were no catastrophe losses in the second quarter or the first six months of 2018 and 2017.

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Net loss and LAE in the second quarter and first six months of 2018 and 2017 include (favorable) unfavorable prior accident year loss reserve development as presented in the table below:

	Three Months Ended              June 30,						Six Months Ended              June 30,
	2018			2017			2018			2017
	($ in millions)
Catastrophe events	$	5.1(	1)	$	(4.0)	(2)	$	(25.3)	(3)	$	(4.4)	(2)
Non-catastrophe		(18.8)	(4)		(18.9)	(5)		(29.8)	(4)		(50.0)	(5)
Total	$	(13.7)		$	(22.9)		$	(55.1)		$	(54.4)

(1) Primarily reflects unfavorable prior accident year loss reserve development related to Hurricane Maria that occurred in the 2017 accident year, partially offset by favorable prior accident year loss reserve development related to Hurricane Harvey that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

(2) Primarily reflects favorable prior accident year loss reserve development related to several catastrophes that occurred in the 2010 through 2016 accident years.

(3) Primarily reflects favorable prior accident year loss reserve development related to Hurricanes Harvey and Maria that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

(4) Primarily reflects favorable prior accident year loss reserve development in the 2016 and 2017 accident years.

(5) Primarily reflects favorable prior accident year loss reserve development in the 2013 through 2016 accident years.

The favorable prior accident year loss reserve development in the second quarter and first six months of 2018 and 2017 reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods. The favorable prior accident year loss reserve development in the second quarter and first six months of 2018 did not impact assumptions used in estimating TransRe’s loss and LAE liabilities for business earned in the first six months of 2018.

Casualty & other. The decrease in net loss and LAE in the second quarter of 2018 from the second quarter of 2017 primarily reflects an increase in favorable prior accident year loss reserve development. The slight decrease in net loss and LAE in the first six months of 2018 from the first six months of 2017 primarily reflects an increase in favorable prior accident year loss reserve development, largely offset by the impact of higher net premiums earned.

Net loss and LAE in the second quarter and first six months of 2018 and 2017 include (favorable) unfavorable prior accident year loss reserve development as presented in the table below:

	Three Months Ended              June 30,						Six Months Ended              June 30,
	2018			2017			2018			2017
	($ in millions)
Malpractice Treaties(1)	$	(3.4)		$	(2.0)		$	(3.4)		$	(2.0)
Ogden rate impact(2)		-			-			-			24.4
Other		(33.6)	(3)		(27.7)	(4)		(63.8)	(5)		(58.9)	(4)
Total	$	(37.0)		$	(29.7)		$	(67.2)		$	(36.5)

(1) Represents certain medical malpractice treaties pursuant to which the increased underwriting profits created by the favorable prior accident year loss reserve development are largely retained by the cedants. As a result, the favorable prior accident year loss reserve development is largely offset by an increase in profit commission expense incurred when such favorable prior accident year loss reserve development occurs.

(2) Represents unfavorable prior accident year loss reserve development related to the U.K. Ministry of Justice’s significant reduction in the discount rate, referred to as the Ogden rate, used to calculate lump-sum bodily injury payouts in personal injury insurance claims in the U.K to negative 0.75 percent as of March 20, 2017 from 2.50 percent.

(3) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2015 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

(4) Primarily reflects favorable prior accident year loss reserve development in the longer-tailed U.S. professional liability lines of business in the 2005 through 2014 accident years, partially offset by unfavorable development in the shorter-tailed casualty lines of business in the 2015 accident year in the U.S. and in the U.K.

(5) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2016 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

The favorable prior accident year loss reserve development in the second quarter and first six months of 2018 and 2017 reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods. The favorable prior accident year loss reserve development in the second quarter and first six months of 2018 did not impact assumptions used in estimating TransRe’s loss and LAE liabilities for business earned in the first six months of 2018.

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Reinsurance Segment: Commissions, brokerage and other underwriting expenses. The following table presents commissions, brokerage and other underwriting expenses for the reinsurance segment:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018		2017		Percent Change		2018		2017		Percent Change
	($ in millions)
Property
Commissions, brokerage and other underwriting expenses	$	94.8	$	87.9		7.8%	$	187.9	$	178.7		5.1%
Expense ratio		32.5%		32.5%				33.1%		32.1%
Casualty & other
Commissions, brokerage and other underwriting expenses	$	223.2	$	234.3		(4.7%)	$	452.1	$	459.0		(1.5%)
Expense ratio		32.4%		34.1%				32.9%		34.6%
Total
Commissions, brokerage and other underwriting expenses	$	318.0	$	322.2		(1.3%)	$	640.0	$	637.7		0.4%
Expense ratio		32.4%		33.6%				33.0%		33.9%

Property. The increase in commissions, brokerage and other underwriting expenses in the second quarter of 2018 from the second quarter of 2017 primarily reflects the impact of higher net premiums earned. The increase in commissions, brokerage and other underwriting expenses in the first six months of 2018 from the first six months of 2017 primarily reflects an increase in commission rates and the impact of higher net premiums earned.

Casualty & other. The decrease in commissions, brokerage and other underwriting expenses in the second quarter of 2018 from the second quarter of 2017 primarily reflects a decrease in commission rates. The decrease in commissions, brokerage and other underwriting expenses in the first six months of 2018 from the first six months of 2017 primarily reflects a decrease in commission rates, partially offset by the impact of higher net premiums earned.

Reinsurance Segment: Underwriting profit. The following table presents underwriting profit (loss) for the reinsurance segment:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018		2017		Percent Change		2018		2017		Percent Change
	($ in millions)
Property
Underwriting profit	$	43.8	$	59.7		(26.6%)	$	129.2	$	133.9		(3.5%)
Combined ratio		85.0%		77.9%				77.2%		76.0%
Casualty & other
Underwriting profit (loss)	$	26.0	$	2.5		940.0%	$	39.4	$	(18.2)		(316.5%)
Combined ratio		96.2%		99.7%				97.1%		101.3%
Total
Underwriting profit	$	69.8	$	62.2		12.2%	$	168.6	$	115.7		45.7%
Combined ratio		92.8%		93.5%				91.4%		93.9%

Property. The decrease in underwriting profit in the second quarter of 2018 from the second quarter of 2017 primarily reflects a decrease in favorable prior accident year loss reserve development and higher non-catastrophe losses, partially offset by the impact of

43

higher net premiums earned, all as discussed above. The decrease in underwriting profit in the first six months of 2018 from the first six months of 2017 primarily reflects an increase in commission rates, as discussed above.    

Casualty & other. The increase in underwriting profit in the second quarter of 2018 from the second quarter of 2017, and the underwriting profit in the first six months of 2018 compared with an underwriting loss in the first six months of 2017, primarily reflect increases in favorable prior accident year loss reserve development, decreases in commission rates and the impact of higher net premiums earned, all as discussed above.

Insurance Segment Underwriting Results

The insurance segment is comprised of AIHL’s RSUI, CapSpecialty and PacificComp (prior to its sale on December 31, 2017) operating subsidiaries. RSUI also writes a modest amount of assumed reinsurance business, which is included in the insurance segment. For a more detailed description of our insurance segment, see Part I, Item 1, “Business—Segment Information—Insurance Segment” of the 2017 Form 10-K.

The underwriting results of the insurance segment are presented below.

Three Months Ended June 30, 2018	RSUI		CapSpecialty		Total
	($ in millions)
Gross premiums written	$	318.8	$	88.7	$	407.5
Net premiums written		216.9		82.3		299.2
Net premiums earned		184.7		71.0		255.7
Net loss and LAE:
Current year (excluding catastrophe losses)		93.4		38.5		131.9
Current year catastrophe losses		13.7		0.6		14.3
Prior years		(1.4)		(0.1)		(1.5)
Total net loss and LAE		105.7		39.0		144.7
Commissions, brokerage and other underwriting expenses		53.7		30.4		84.1
Underwriting profit(1)	$	25.3	$	1.6	$	26.9
Loss ratio(2):
Current year (excluding catastrophe losses)		50.6%		54.2%		51.6%
Current year catastrophe losses		7.4%		0.8%		5.6%
Prior years		(0.8%)		(0.1%)		(0.6%)
Total net loss and LAE		57.2%		54.9%		56.6%
Expense ratio(3)		29.1%		42.8%		32.9%
Combined ratio(4)		86.3%		97.7%		89.5%

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Three Months Ended June 30, 2017	RSUI		CapSpecialty		PacificComp		Total
	($ in millions)
Gross premiums written	$	295.1	$	73.3	$	41.9	$	410.3
Net premiums written		204.6		68.4		41.3		314.3
Net premiums earned		178.5		64.1		43.9		286.5
Net loss and LAE:
Current year (excluding catastrophe losses)		94.5		34.0		33.0		161.5
Current year catastrophe losses		9.6		1.8		-		11.4
Prior years		(10.3)		(0.2)		(0.5)		(11.0)
Total net loss and LAE		93.8		35.6		32.5		161.9
Commissions, brokerage and other underwriting expenses		53.0		27.2		11.3		91.5
Underwriting profit(1)	$	31.7	$	1.3	$	0.1	$	33.1
Loss ratio(2):
Current year (excluding catastrophe losses)		52.9%		53.0%		75.2%		56.3%
Current year catastrophe losses		5.4%		2.8%		-    %		4.0%
Prior years		(5.8%)		(0.3%)		(1.1%)		(3.8%)
Total net loss and LAE		52.5%		55.5%		74.1%		56.5%
Expense ratio(3)		29.7%		42.5%		25.7%		31.9%
Combined ratio(4)		82.2%		98.0%		99.8%		88.4%
Six Months Ended June 30, 2018			RSUI		CapSpecialty		Total
			($ in millions)
Gross premiums written			$	593.4	$	163.2	$	756.6
Net premiums written				403.8		151.7		555.5
Net premiums earned				365.6		137.7		503.3
Net loss and LAE:
Current year (excluding catastrophe losses)				197.5		75.6		273.1
Current year catastrophe losses				17.6		0.8		18.4
Prior years				(12.5)		(3.1)		(15.6)
Total net loss and LAE				202.6		73.3		275.9
Commissions, brokerage and other underwriting expenses				107.2		61.2		168.4
Underwriting profit(1)			$	55.8	$	3.2	$	59.0
Loss ratio(2):
Current year (excluding catastrophe losses)				54.0%		54.9%		54.3%
Current year catastrophe losses				4.8%		0.6%		3.6%
Prior years				(3.4%)		(2.3%)		(3.1%)
Total net loss and LAE				55.4%		53.2%		54.8%
Expense ratio(3)				29.3%		44.4%		33.5%
Combined ratio(4)				84.7%		97.6%		88.3%

45

Six Months Ended June 30, 2017	RSUI			CapSpecialty			PacificComp			Total
	($ in millions)
Gross premiums written	$	559.6		$	138.8		$	82.6		$	781.0
Net premiums written		387.2			129.4			81.4			598.0
Net premiums earned		361.2			126.2			82.2			569.6
Net loss and LAE:
Current year (excluding catastrophe losses)		179.9			67.3			62.0			309.2
Current year catastrophe losses		13.2			2.2			-			15.4
Prior years		(18.7	)		(0.8	)		(1.0	)		(20.5	)
Total net loss and LAE		174.4			68.7			61.0			304.1
Commissions, brokerage and other underwriting expenses		107.9			54.9			21.7			184.5
Underwriting profit (loss)(1)	$	78.9		$	2.6		$	(0.5	)	$	81.0
Loss ratio(2):
Current year (excluding catastrophe losses)		49.8	%		53.3	%		75.4	%		54.3	%
Current year catastrophe losses		3.7	%		1.7	%		-	%		2.7	%
Prior years		(5.2	%)		(0.6	%)		(1.2	%)		(3.6	%)
Total net loss and LAE		48.3	%		54.4	%		74.2	%		53.4	%
Expense ratio(3)		29.9	%		43.5	%		26.4	%		32.4	%
Combined ratio(4)		78.2	%		97.9	%		100.6	%		85.8	%

(1) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, OTTI losses, noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets and interest expense. Underwriting profit is a non-GAAP financial measure and does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. See “Comment on Non-GAAP Financial Measures” herein for additional detail on the presentation of our results of operations.

(2) The loss ratio is derived by dividing the amount of net loss and LAE by net premiums earned, all as determined in accordance with GAAP.

(3) The expense ratio is derived by dividing the amount of commissions, brokerage and other underwriting expenses by net premiums earned, all as determined in accordance with GAAP.

(4) The combined ratio is the sum of the loss ratio and the expense ratio, all as determined in accordance with GAAP. The combined ratio represents the percentage of each premium dollar a reinsurance or an insurance company has to spend on net loss and LAE, and commissions, brokerage and other underwriting expenses.

46

Insurance Segment: Premiums. The following table presents premiums for the insurance segment:

	Three Months Ended							Six Months Ended
	June 30,							June 30,
	2018		2017		Percent Change			2018		2017		Percent Change
	($ in millions)
RSUI
Premiums written:
Gross premiums written	$	318.8	$	295.1		8.0	%	$	593.4	$	559.6		6.0	%
Net premiums written		216.9		204.6		6.0	%		403.8		387.2		4.3	%
Net premiums earned		184.7		178.5		3.5	%		365.6		361.2		1.2	%
CapSpecialty
Premiums written:
Gross premiums written	$	88.7	$	73.3		21.0	%	$	163.2	$	138.8		17.6	%
Net premiums written		82.3		68.4		20.3	%		151.7		129.4		17.2	%
Net premiums earned		71.0		64.1		10.8	%		137.7		126.2		9.1	%
PacificComp
Premiums written:
Gross premiums written	$	-	$	41.9		(100.0	%)	$	-	$	82.6		(100.0	%)
Net premiums written		-		41.3		(100.0	%)		-		81.4		(100.0	%)
Net premiums earned		-		43.9		(100.0	%)		-		82.2		(100.0	%)
Total
Premiums written:
Gross premiums written	$	407.5	$	410.3		(0.7	%)	$	756.6	$	781.0		(3.1	%)
Net premiums written		299.2		314.3		(4.8	%)		555.5		598.0		(7.1	%)
Net premiums earned		255.7		286.5		(10.8	%)		503.3		569.6		(11.6	%)

RSUI. The increases in gross premiums written in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases in most lines of business due to an increase in business opportunities and improved general market conditions, particularly in the property lines of business.

The increases in net premiums earned in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect an increase in gross premiums written in recent quarters, partially offset by higher ceded premiums earned related to reinstatement premiums on RSUI’s per risk property reinsurance treaties.

CapSpecialty. The increases in gross premiums written in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect growth in the professional liability and miscellaneous medical lines of business due to CapSpecialty’s distribution initiatives and expanded product offerings and, to a lesser extent, the impact of CapSpecialty’s purchase of renewal rights associated with a small environmental block of business on February 20, 2018, as well as growth in the surety lines of business.

The increases in net premiums earned in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases in gross premiums written in recent quarters.

PacificComp. The results shown for the second quarter and first six months of 2018 reflect the sale of PacificComp as of December 31, 2017.

47

Insurance Segment: Net loss and LAE. The following table presents net loss and LAE for the insurance segment:

	Three Months Ended									Six Months Ended
	June 30,									June 30,
	2018			2017			Percent Change			2018			2017			Percent Change
	($ in millions)
RSUI
Net loss and LAE:
Current year (excluding catastrophe losses)	$	93.4		$	94.5			(1.2	%)	$	197.5		$	179.9			9.8	%
Current year catastrophe losses		13.7			9.6			42.7	%		17.6			13.2			33.3	%
Prior years		(1.4	)		(10.3	)		(86.4	%)		(12.5	)		(18.7	)		(33.2	%)
Total net loss and LAE	$	105.7		$	93.8			12.7	%	$	202.6		$	174.4			16.2	%
Loss ratio:
Current year (excluding catastrophe losses)		50.6	%		52.9	%					54.0	%		49.8	%
Current year catastrophe losses		7.4	%		5.4	%					4.8	%		3.7	%
Prior years		(0.8	%)		(5.8	%)					(3.4	%)		(5.2	%)
Total net loss and LAE		57.2	%		52.5	%					55.4	%		48.3	%
CapSpecialty
Net loss and LAE:
Current year (excluding catastrophe losses)	$	38.5		$	34.0			13.2	%	$	75.6		$	67.3			12.3	%
Current year catastrophe losses		0.6			1.8			(66.7	%)		0.8			2.2			(63.6	%)
Prior years		(0.1	)		(0.2	)		(50.0	%)		(3.1	)		(0.8	)		287.5	%
Total net loss and LAE	$	39.0		$	35.6			9.6	%	$	73.3		$	68.7			6.7	%
Loss ratio:
Current year (excluding catastrophe losses)		54.2	%		53.0	%					54.9	%		53.3	%
Current year catastrophe losses		0.8	%		2.8	%					0.6	%		1.7	%
Prior years		(0.1	%)		(0.3	%)					(2.3	%)		(0.6	%)
Total net loss and LAE		54.9	%		55.5	%					53.2	%		54.4	%
PacificComp
Net loss and LAE:
Current year (excluding catastrophe losses)	$	-		$	33.0			(100.0	%)	$	-		$	62.0			(100.0	%)
Current year catastrophe losses		-			-			-			-			-			-
Prior years		-			(0.5	)		(100.0	%)		-			(1.0	)		(100.0	%)
Total net loss and LAE	$	-		$	32.5			(100.0	%)	$	-		$	61.0			(100.0	%)
Loss ratio:
Current year (excluding catastrophe losses)		-	%		75.2	%					-	%		75.4	%
Current year catastrophe losses		-	%		-	%					-	%		-	%
Prior years		-	%		(1.1	%)					-	%		(1.2	%)
Total net loss and LAE		-	%		74.1	%					-	%		74.2	%
Total
Net loss and LAE:
Current year (excluding catastrophe losses)	$	131.9		$	161.5			(18.3	%)	$	273.1		$	309.2			(11.7	%)
Current year catastrophe losses		14.3			11.4			25.4	%		18.4			15.4			19.5	%
Prior years		(1.5	)		(11.0	)		(86.4	%)		(15.6	)		(20.5	)		(23.9	%)
Total net loss and LAE	$	144.7		$	161.9			(10.6	%)	$	275.9		$	304.1			(9.3	%)
Loss ratio:
Current year (excluding catastrophe losses)		51.6	%		56.3	%					54.3	%		54.3	%
Current year catastrophe losses		5.6	%		4.0	%					3.6	%		2.7	%
Prior years		(0.6	%)		(3.8	%)					(3.1	%)		(3.6	%)
Total net loss and LAE		56.6	%		56.5	%					54.8	%		53.4	%

48

RSUI. The increases in net loss and LAE in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect decreases in favorable prior accident year loss reserve development and increases in catastrophe losses. The increase in net loss and LAE in the first six months of 2018 from the first six months of 2017 also reflects higher non-catastrophe property losses incurred. Catastrophe losses in the second quarter and first six months of 2018 primarily related to flooding and severe weather in the Northeastern U.S. and the State of California. Catastrophe losses in the second quarter and first six months of 2017 primarily reflect losses from flooding in the State of California and severe weather primarily in the Southeastern and Midwestern U.S.

Net loss and LAE in the second quarter and first six months of 2018 and 2017 include (favorable) unfavorable prior accident year loss reserve development as presented in the table below:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in millions)
Casualty	$	(1.5	)(1)	$	(9.5	)(2)	$	(12.5	)(3)	$	(21.6	)(2)
Property and other		0.1			(0.8	)		-			2.9	(4)
Total	$	(1.4	)	$	(10.3	)	$	(12.5	)	$	(18.7	)

(1) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors’ and officers’ liability lines of business in the 2012 accident year.

(2) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2011 accident years.

(3) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors’ and officers’ liability lines of business in the 2009 and 2012 accident years.

(4) Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business in the 2015 and 2016 accident years.

The favorable prior accident year loss reserve development in the second quarter and first six months of 2018 and 2017 reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods. The favorable prior accident year loss reserve development in the second quarter and first six months of 2018 did not impact assumptions used in estimating RSUI’s loss and LAE liabilities for business earned in the first six months of 2018.

CapSpecialty. The increases in net loss and LAE in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect the impact of higher net premiums earned and higher 2018 accident year losses due primarily to an increase in net premiums earned for certain lines of business with a higher loss ratio. The increase in net loss and LAE in the first six months of 2018 from the first six months of 2017 was partially offset by an increase in favorable prior accident year loss reserve development.

Net loss and LAE in the first six months of 2018 includes favorable prior accident year loss reserve development primarily in the surety lines of business primarily related to the 2016 and 2017 accident years. The favorable prior accident year loss reserve development in the first six months of 2018 and 2017 reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods. The favorable prior accident year loss reserve development in the first six months of 2018 did not impact assumptions used in estimating CapSpecialty’s loss and LAE liabilities for business earned in the first six months of 2018. Net loss and LAE in the second quarter and first six months of 2017 include favorable prior accident year loss reserve development primarily in the casualty lines of business related primarily to the 2010 and 2015 accident years.

49

Insurance Segment: Commissions, brokerage and other underwriting expenses. The following table presents commissions, brokerage and other underwriting expenses for the insurance segment:

	Three Months Ended									Six Months Ended
	June 30,									June 30,
	2018			2017			Percent Change			2018			2017			Percent Change
	($ in millions)
RSUI
Commissions, brokerage and other underwriting expenses	$	53.7		$	53.0			1.3	%	$	107.2		$	107.9			(0.6	%)
Expense ratio		29.1	%		29.7	%					29.3	%		29.9	%
CapSpecialty
Commissions, brokerage and other underwriting expenses	$	30.4		$	27.2			11.8	%	$	61.2		$	54.9			11.5	%
Expense ratio		42.8	%		42.5	%					44.4	%		43.5	%
PacificComp
Commissions, brokerage and other underwriting expenses	$	-		$	11.3			(100.0	%)	$	-		$	21.7			(100.0	%)
Expense ratio		-	%		25.7	%					-	%		26.4	%
Total
Commissions, brokerage and other underwriting expenses	$	84.1		$	91.5			(8.1	%)	$	168.4		$	184.5			(8.7	%)
Expense ratio		32.9	%		31.9	%					33.5	%		32.4	%

RSUI. Commissions, brokerage and other underwriting expenses in the second quarter and first six months of 2018 approximated commissions, brokerage and other underwriting expenses from the corresponding 2017 periods, primarily reflecting the impact of higher net premiums earned, offset by slightly lower commission expense incurred.

CapSpecialty. The increases in commissions, brokerage and other underwriting expenses in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect the impact of higher net premiums earned and relatively stable overhead expenses. In addition, the increases also reflect one-time acquisition expenses arising from CapSpecialty’s purchase of renewal rights associated with a small environmental block of business on February 20, 2018.

50

Insurance Segment: Underwriting profit. The following table presents underwriting profit (loss) for the insurance segment:

	Three Months Ended									Six Months Ended
	June 30,									June 30,
	2018			2017			Percent Change			2018			2017			Percent Change
							($ in millions)
RSUI
Underwriting profit	$	25.3		$	31.7			(20.2	%)	$	55.8		$	78.9			(29.3	%)
Combined ratio		86.3	%		82.2	%					84.7	%		78.2	%
CapSpecialty
Underwriting profit	$	1.6		$	1.3			23.1	%	$	3.2		$	2.6			23.1	%
Combined ratio		97.7	%		98.0	%					97.6	%		97.9	%
PacificComp
Underwriting profit (loss)	$	-		$	0.1			(100.0	%)	$	-		$	(0.5	)		(100.0	%)
Combined ratio		-	%		99.8	%					-	%		100.6	%
Total
Underwriting profit	$	26.9		$	33.1			(18.7	%)	$	59.0		$	81.0			(27.2	%)
Combined ratio		89.5	%		88.4	%					88.3	%		85.8	%

RSUI. The decreases in underwriting profit in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect decreases in favorable prior accident year loss reserve development and increases in catastrophe losses, all as discussed above. The increase in net loss and LAE in the first six months of 2018 from the first six months of 2017 also reflects higher non-catastrophe property losses incurred.

CapSpecialty. The increase in underwriting profit in the second quarter of 2018 from second quarter of 2017 primarily reflects the impact of higher net premiums earned, as discussed above. The increase in underwriting profit in the first six months of 2018 from the first six months of 2017 primarily reflects an increase in favorable prior accident year loss reserve development and the impact of higher net premiums earned, all as discussed above.

Investment Results for the Reinsurance and Insurance Segments

The following table presents the investment results for our reinsurance and insurance segments:

	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2018		2017			Percent Change			2018			2017		Percent Change
	($ in millions)
Net investment income	$	121.1	$	98.0			23.6	%	$	239.4		$	210.3		13.8	%
Change in the fair value of equity securities		146.8		-			-			132.7			-		-
Net realized capital gains		6.8		9.2			(26.1	%)		50.7			69.4		(26.9	%)
Other than temporary impairment losses		-		(3.8	)		(100.0	%)		(0.5	)		(7.0)		(92.9	%)

Net investment income. The increases in net investment income in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases in dividend income resulting from an increase in the size of the equity securities portfolio and higher interest income. The increase in interest income primarily reflects higher yields on short-term investments and floating-rate debt securities and higher income from funds withheld, partially offset by the impact of the sale of PacificComp.

In addition, net investment income in the second quarter and first six months of 2018 reflects higher partnership income at AIHL. AIHL’s partnership income in the first six months of 2018 includes a $12.9 million increase in the carrying value of AIHL’s limited partnership interests in certain subsidiaries of Ares as of March 15, 2018. See Note 3(h) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information. Partnership income in the second quarter and first six months of 2017 includes a $12.6 million charge on our equity investment in Ares. The charge on our equity investment in Ares reflected our share of a one-time payment recorded by Ares related to an acquisition by its affiliated entity.

51

In connection with this acquisition, Ares agreed to make certain transaction support payments to the sellers of the acquired entity.

Change in the fair value of equity securities. In the first quarter of 2018, we adopted new investment accounting guidance which required changes in the fair value of equity securities, except those accounted for under the equity method, to be recognized in net earnings. In earlier periods, equity securities were considered to be AFS and were included in the analysis of OTTI. See Note 1(c) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information regarding our adoption of this new guidance.

The changes in the fair value of equity securities in the second quarter and first six months of 2018 reflect appreciation in the value of our equity securities portfolio, primarily from our holdings in the technology, industrial and energy sectors.

Net realized capital gains. The decreases in net realized capital gains in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect a lack of net realized capital gains from equity securities in the 2018 periods resulting from our adoption of the new investment accounting guidance discussed above. The decrease for the first six months of 2018 was partially offset by a $45.7 million gain on AIHL’s conversion of most of its limited partnership interests in certain subsidiaries of Ares into Ares common units. See Note 3(h) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information on AIHL’s conversion.

Other than temporary impairment losses. OTTI losses in the first six months of 2018 reflect $0.5 million of unrealized losses on debt securities that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $0.5 million of OTTI losses, none were incurred in the second quarter of 2018.

OTTI losses in the first six months of 2017 reflect $7.0 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $7.0 million of OTTI losses, $6.8 million related to equity securities, primarily in the retail sector, and $0.2 million related to debt securities. The determination that unrealized losses on the securities were other than temporary was primarily due to the duration of the decline in the fair value of equity and debt securities relative to their costs. Of the $7.0 million of OTTI losses, $3.8 million was incurred in the second quarter of 2017.

Upon the ultimate disposition of the securities for which OTTI losses have been recorded, a portion of the loss may be recoverable depending on market conditions at the time of disposition. After adjusting the cost basis of securities for the recognition of OTTI losses, the remaining gross unrealized investment losses for debt and equity securities as of June 30, 2018 were deemed to be temporary, based on, among other factors: (i) the duration of time and the relative magnitude to which the fair values of these securities had been below cost were not indicative of an OTTI loss; (ii) the absence of compelling evidence that would cause us to call into question the financial condition or near-term business prospects of the issuers of the securities; and (iii) our ability and intent to hold the securities for a period of time sufficient to allow for any anticipated recovery.

See Note 3 to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional detail on gross unrealized investment losses for debt securities as of June 30, 2018.

Alleghany Capital Segment Results

The Alleghany Capital segment consists of: (i) industrial operations conducted through Bourn & Koch, Kentucky Trailer, W&W|AFCO Steel, beginning April 28, 2017 (the date on which Alleghany Capital acquired approximately 80 percent of the equity thereof), and a 45 percent equity interest in Wilbert Funeral Services, Inc., or “Wilbert,” beginning August 1, 2017 (the date on which Alleghany Capital acquired its equity interest therein); (ii) non-industrial operations conducted through IPS and Jazwares; and (iii) corporate operations at the Alleghany Capital level. On February 7, 2018, W&W|AFCO Steel acquired the outstanding equity of Hirschfeld, a fabricator of steel bridges and structural steel for stadiums, airports and other large commercial and industrial projects. Wilbert is accounted for under the equity method of accounting and is included in other invested assets.

52

The results of the Alleghany Capital segment for the second quarter and first six months of 2018 and 2017 are presented below.

	Three Months Ended June 30,
	2018												2017
	Industrial			Non- industrial			Corp. & other			Total			Industrial			Non- industrial			Corp. & other			Total
	($ in millions)
Noninsurance revenue(1)	$	221.9		$	107.1		$	-		$	329.0		$	74.5		$	118.3		$	-		$	192.8
Net investment income		1.3			0.1			(0.2	)		1.2			-			0.1			0.1			0.2
Net realized capital gains		0.2			(0.3	)		-			(0.1	)		0.1			0.1			-			0.2
Total revenues	$	223.4		$	106.9		$	(0.2	)	$	330.1		$	74.6		$	118.5		$	0.1		$	193.2
Other operating expenses(1)		210.5			101.0			3.0			314.5			71.2			110.6			7.6			189.4
Amortization of intangible assets		2.4			3.4			-			5.8			0.8			4.2			-			5.0
Interest expenses		1.7			0.6			-			2.3			0.6			0.3			0.1			1.0
Earnings (losses) before income taxes	$	8.8		$	1.9		$	(3.2	)	$	7.5		$	2.0		$	3.4		$	(7.6	)	$	(2.2	)
Operating earnings (losses) before income taxes(2)	$	11.0		$	5.6		$	(3.2	)	$	13.4		$	2.7		$	7.5		$	(7.6	)	$	2.6
Add: net realized capital gains		0.2			(0.3	)		-			(0.1	)		0.1			0.1			-			0.2
Less: amortization of intangible assets		(2.4	)		(3.4	)		-			(5.8	)		(0.8	)		(4.2	)		-			(5.0	)
Earnings (losses) before income taxes	$	8.8		$	1.9		$	(3.2	)	$	7.5		$	2.0		$	3.4		$	(7.6	)	$	(2.2	)
	Six Months Ended June 30,
	2018												2017
	Industrial			Non- industrial			Corp. & other			Total			Industrial			Non- industrial			Corp. & other			Total
	($ in millions)
Noninsurance revenue(1)	$	367.4		$	204.2		$	0.1		$	571.7		$	116.4		$	221.2		$	-		$	337.6
Net investment income		2.9			0.1			0.1			3.1			-			0.2			0.3			0.5
Net realized capital gains		0.5			-			-			0.5			0.1			-			-			0.1
Total revenues	$	370.8		$	204.3		$	0.2		$	575.3		$	116.5		$	221.4		$	0.3		$	338.2
Other operating expenses(1)		353.0			196.5			4.9			554.4			110.4			209.5			11.1			331.0
Amortization of intangible assets		4.4			6.8			-			11.2			1.0			8.3			-			9.3
Interest expenses		2.5			1.0			0.1			3.6			1.1			0.6			0.1			1.8
Earnings (losses) before income taxes	$	10.9		$	-		$	(4.8	)	$	6.1		$	4.0		$	3.0		$	(10.9	)	$	(3.9	)
Operating earnings (losses) before income taxes(2)	$	14.8		$	6.8		$	(4.8	)	$	16.8		$	4.9		$	11.3		$	(10.9	)	$	5.3
Add: net realized capital gains		0.5			-			-			0.5			0.1			-			-			0.1
Less: amortization of intangible assets		(4.4	)		(6.8	)		-			(11.2	)		(1.0	)		(8.3	)		-			(9.3	)
Earnings (losses) before income taxes	$	10.9		$	-		$	(4.8	)	$	6.1		$	4.0		$	3.0		$	(10.9	)	$	(3.9	)

(1) For industrial and non-industrial operations: (i) noninsurance revenue consists of the sale of manufactured goods and services; and (ii) other operating expenses consist of the cost of goods and services sold, and selling, general and administrative expenses. Other operating expenses also includes finders’ fees, legal and accounting costs and other transaction-related expenses of $1.1 million and $5.7 million for the second quarter of 2018 and 2017, respectively, and $2.9 million and $6.0 million for the first six months of 2018 and 2017, respectively.

(2) Operating earnings before income taxes is a non-GAAP financial measure and does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. See “Comment on Non-GAAP Financial Measures” herein for additional detail on the presentation of our results of operations. Operating earnings before income taxes represent noninsurance revenue less all operating expenses, and does not include: (i) amortization of intangible assets; (ii) change in the fair value of equity securities; (iii) net realized capital gains; (iv) OTTI impairment losses; and (v) income taxes.

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The changes in Alleghany Capital’s equity for the three and six months ended June 30, 2018 and 2017 are presented below.

	Three Months Ended June 30,
	2018												2017
	Industrial			Non- industrial			Corp. & other			Total			Industrial			Non- industrial			Corp. & other			Total
	($ in millions)
Equity, beginning of period	$	442.7		$	319.5		$	34.9		$	797.1		$	122.0		$	325.5		$	(8.2	)	$	439.3
Earnings (losses) before income taxes		8.8			1.9			(3.2	)		7.5			2.0			3.4			(7.6	)		(2.2	)
Income taxes(1)		(0.4	)		(0.2	)		(0.7	)		(1.3	)		(0.2	)		(0.1	)		1.0			0.7
Net earnings attributable to noncontrolling interests(2)		(1.3	)		(2.0	)		-			(3.3	)		(0.3	)		(0.6	)		-			(0.9	)
Capital contributions (returns of capital) and other(3)		(10.6	)		(7.1	)		(5.1	)		(22.8	)		160.5			(4.7	)		9.6			165.4
Equity, end of period	$	439.2		$	312.1		$	25.9		$	777.2		$	284.0		$	323.5		$	(5.2	)	$	602.3
	Six Months Ended June 30,
	2018												2017
	Industrial			Non- industrial			Corp. & other			Total			Industrial			Non- industrial			Corp. & other			Total
	($ in millions)
Equity, beginning of period	$	363.6		$	331.3		$	11.2		$	706.1		$	122.7		$	330.7		$	(12.1	)	$	441.3
Earnings (losses) before income taxes		10.9			-			(4.8	)		6.1			4.0			3.0			(10.9	)		(3.9	)
Income taxes(1)		(0.7	)		(0.6	)		(0.2	)		(1.5	)		(0.2	)		-			1.6			1.4
Net earnings attributable to noncontrolling interests(2)		(1.3	)		(1.6	)		-			(2.9	)		(0.6	)		(0.4	)		-			(1.0	)
Capital contributions (returns of capital) and other(3)		66.7			(17.0	)		19.7			69.4			158.1			(9.8	)		16.2			164.5
Equity, end of period	$	439.2		$	312.1		$	25.9		$	777.2		$	284.0		$	323.5		$	(5.2	)	$	602.3

(1) Federal income taxes for most Alleghany Capital subsidiaries are incurred at the Alleghany Capital corporate level. Estimated federal income tax (expense) benefit incurred at the Alleghany Capital corporate level attributable to industrial and non-industrial operations for the second quarter of 2018 were ($1.9) million and ($0.4) million, respectively, and for the second quarter of 2017 were ($0.7) million and ($1.2) million, respectively, and for the first six months of 2018 were ($2.1) million and ($0.0) million, respectively, and for the first six months of 2017 were ($1.4) million and ($1.0) million, respectively.

(2) During the first six months of 2018, the noncontrolling interests outstanding were approximately as follows: Bourn & Koch - 11 percent; Kentucky Trailer - 21 percent; W&W|AFCO Steel - 20 percent; IPS - 16 percent; and Jazwares - 23 percent.

(3) For the six months ended June 30, 2018, primarily reflected funding provided by Alleghany Capital for the February 7, 2018 acquisition of Hirschfeld by W&W|AFCO Steel. For the second quarter and first six months of 2017, primarily reflected funding provided by Alleghany Capital for the acquisition of W&W|AFCO Steel.

Noninsurance revenue. The increases in noninsurance revenue in the second quarter and first six months of 2018 from the corresponding 2017 periods reflect significant increases in industrial operations, partially offset by decreases in non-industrial operations. The increases for the industrial operations primarily reflect the acquisitions of W&W|AFCO Steel and, to a lesser extent, Hirschfeld, as well as increases in sales at Kentucky Trailer and Bourn & Koch. The decreases for the non-industrial operations primarily reflect lower sales at IPS due to the timing of large projects and changes in the mix of services provided, partially offset by increases in sales at Jazwares.

Net investment income. The increases in net investment income in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect Alleghany Capital’s earnings from its investment in Wilbert.

Net realized capital gains. Net realized capital gains in the second quarter and first six months of 2018 primarily reflect gains from the sale of certain investments and equipment, as well as certain foreign currency exchange rate impacts.

Other operating expenses. The increases in other operating expenses in the second quarter and first six months of 2018 from the corresponding 2017 periods reflect significant increases in industrial operations, partially offset by decreases in non-industrial operations and corporate & other. The increases for the industrial operations primarily reflect the acquisitions of W&W|AFCO Steel and, to a lesser extent, Hirschfeld, as well as increases in costs related to higher sales at Kentucky Trailer and Bourn & Koch. Other operating expenses of the industrial operations also reflect significant finders’ fees, legal and accounting costs and other transaction-related expenses in the first quarter of 2018, primarily related to W&W|AFCO Steel’s acquisition of Hirschfeld, as well as in the second quarter of 2017, primarily related to Alleghany Capital’s acquisition of W&W|AFCO Steel. The decreases in other operating expenses for the non-industrial operations primarily reflect lower costs related to lower sales at IPS, partially offset by increases in

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costs at Jazwares related to higher sales, as well as the impact of certain Toys “R” Us Inc. liquidation-related charges. The decreases at corporate & other is due to decreases in long-term incentive compensation expense accruals at Alleghany Capital.

Amortization of intangible assets. The increases in amortization expense in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect the amortization of net intangible assets related to the acquisition of W&W|AFCO Steel and, to a lesser extent, Hirschfeld.

Interest expense. The increases in interest expense in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect borrowings at W&W|AFCO Steel and, to a lesser extent, Hirschfeld.

Earnings (losses) before income taxes. The earnings before income taxes in the second quarter and first six months of 2018, compared with losses before income taxes in the second quarter and first six months of 2017, reflect increased earnings in the industrial businesses and decreased corporate & other expenses, partially offset by lower earnings in the non-industrial business. The increases in industrial businesses’ earnings before taxes primarily reflect Alleghany Capital’s investment in Wilbert, as well as improved results at Kentucky Trailer and Bourn & Koch, all as discussed above. The increased earnings before income taxes from the acquisitions of W&W|AFCO Steel and Hirschfeld were offset by increases in amortization expense. The decreases in non-industrial operating earnings before income taxes in the second quarter and first six months of 2018 reflect lower sales at IPS and higher expenses at Jazwares, all as discussed above.

Corporate Activities Results

The primary components of corporate activities are Alleghany Properties, SORC and activities at the Alleghany parent company. The following table presents the results for corporate activities:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in millions)
Net premiums earned	$	-		$	-		$	-		$	-
Net investment income		4.0			3.5			7.9			6.4
Change in the fair value of equity securities		38.4			-			9.9			-
Net realized capital gains		(0.2	)		(0.1	)		(0.2	)		(0.6	)
Other than temporary impairment losses		-			-			-			-
Noninsurance revenue		9.0			6.7			12.3			10.7
Total revenues		51.2			10.1			29.9			16.5
Net loss and loss adjustment expenses		-			-			-			-
Commissions, brokerage and other underwriting expenses		-			-			-			-
Other operating expenses		8.8			9.9			16.7			20.2
Corporate administration		13.3			13.6			21.4			29.7
Amortization of intangible assets		-			-			-			-
Interest expense		13.1			13.2			26.6			26.5
Earnings (losses) before income taxes	$	16.0		$	(26.6	)	$	(34.8	)	$	(59.9	)

Net investment income. The increases in net investment income in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect higher dividend income resulting from an increase in the size of the equity security portfolio held at the Alleghany parent company-level.

Change in the fair value of equity securities. In the first quarter of 2018, we adopted new investment accounting guidance which required changes in the fair value of equity securities, except those accounted for under the equity method, to be recognized in net earnings. See Note 1(c) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information regarding our adoption of this new guidance.

The changes in the fair value of equity securities in the second quarter and first six months of 2018 reflect increases in the value of the equity securities held at the Alleghany parent company-level, primarily from holdings in the energy sector.

Net realized capital gains. Net realized capital losses for the first six months of 2017 primarily reflect modest net losses from the sale of equity securities.

Noninsurance revenue. The increases in noninsurance revenue in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect increases in oil sales at SORC and property sales at Alleghany Properties.

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Other operating expenses. The decreases in other operating expenses in the second quarter and first six months of 2018 from the corresponding 2017 periods primarily reflect the impact of the sale of a SORC legacy oil field on December 29, 2017.

Corporate administration. The decrease in corporate administration expense in the first six months of 2018 from the first six months of 2017 primarily reflects a decrease in Alleghany’s long-term incentive compensation expense accruals due to the impact of a decline in unrealized appreciation on our debt securities portfolio in the first six months of 2018.

Earnings (Losses) before income taxes. The earnings before income taxes in the second quarter of 2018 compared with losses before income taxes in the second quarter of 2017, and the decrease in losses before income taxes in the first six months of 2018 from the first six months of 2017, primarily reflect an increase in the value of the equity securities held at the Alleghany parent company-level and, to a lesser extent, decreases in losses before income taxes at SORC, all as discussed above. The decrease in losses before income taxes in the first six months of 2018 from the first six months of 2017 also reflects a decrease in corporate administration expense, as discussed above.

Reserve Review Process

Our reinsurance and insurance subsidiaries analyze, at least quarterly, liabilities for unpaid loss and LAE established in prior years and adjust their expected ultimate cost, where necessary, to reflect favorable or unfavorable development in loss experience and new information, including, for certain catastrophe events, revised industry estimates of the magnitude of a catastrophe. Adjustments to previously recorded liabilities for unpaid loss and LAE, both favorable and unfavorable, are reflected in our financial results in the periods in which these adjustments are made and are referred to as prior accident year loss reserve development. The following table presents the reserves established in connection with the loss and LAE of our reinsurance and insurance segments on a gross and net basis by line of business. These reserve amounts represent the accumulation of estimates of ultimate loss (including for losses that have been incurred but not reported, or “IBNR”) and LAE.

	As of June 30, 2018								As of December 31, 2017
	Gross Loss and LAE Reserves			Reinsurance Recoverables on Unpaid Losses			Net Loss and LAE Reserves		Gross Loss and LAE Reserves			Reinsurance Recoverables on Unpaid Losses			Net Loss and LAE Reserves
	($ in millions)
Reinsurance Segment
Property	$	1,491.7		$	(429.5	)	$	1,062.2	$	1,758.0		$	(493.7	)	$	1,264.3
Casualty & other(1)		7,342.4			(233.8	)		7,108.6		7,370.0			(251.0	)		7,119.0
		8,834.1			(663.3	)		8,170.8		9,128.0			(744.7	)		8,383.3
Insurance Segment
Property		461.6			(176.2	)		285.4		545.9			(225.9	)		320.0
Casualty(2)		2,101.9			(667.5	)		1,434.4		2,078.6			(671.8	)		1,406.8
Workers’ Compensation		3.8			-			3.8		1.5			-			1.5
All other(3)		180.3			(70.6	)		109.7		185.1			(75.5	)		109.6
		2,747.6			(914.3	)		1,833.3		2,811.1			(973.2	)		1,837.9
Eliminations		(66.2	)		66.2			-		(67.8	)		67.8			-
Total	$	11,515.5		$	(1,511.4	)	$	10,004.1	$	11,871.3		$	(1,650.1	)	$	10,221.2

(1) Primarily consists of the following reinsurance lines of business: directors’ and officers’ liability; errors and omissions liability; general liability; medical malpractice; ocean marine and aviation; auto liability; accident and health; surety; asbestos-related illness and environmental impairment liability; and credit.

(2) Primarily consists of the following direct lines of business: umbrella/excess; directors’ and officers’ liability; professional liability; and general liability.

(3) Primarily consists of commercial multi-peril and surety lines of business, as well as 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.

Changes in Gross and Net Loss and LAE Reserves between June 30, 2018 and December 31, 2017. Gross and net loss and LAE reserves as of June 30, 2018 decreased from December 31, 2017, primarily reflecting payments on catastrophe losses incurred in 2017 and favorable prior accident year loss reserve development.

Reinsurance Recoverables

Our reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite in order to reduce the effect of individual or aggregate exposure to losses, manage capacity, protect capital resources, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns and enable them to increase gross premium writings and risk capacity without requiring additional capital. Our reinsurance and insurance subsidiaries purchase reinsurance and retrocessional coverages from highly-rated third-party reinsurers. If the assuming reinsurers are unable or unwilling to meet the obligations assumed under the applicable

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reinsurance agreements, our reinsurance and insurance subsidiaries would remain liable for such reinsurance portion not paid by these reinsurers. As such, funds, trust agreements and letters of credit are held to collateralize a portion of our reinsurance and insurance subsidiaries’ reinsurance recoverables, and our reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite or assume with multiple reinsurance programs.

As of June 30, 2018, our reinsurance and insurance subsidiaries had total reinsurance recoverables of $1,602.6 million, consisting of $1,511.4 million of ceded outstanding loss and LAE and $91.2 million of recoverables on paid losses. See Part I, Item 1, “Business — Reinsurance Protection” of the 2017 Form 10-K for additional information on the reinsurance purchased by our reinsurance and insurance subsidiaries.

The following table presents information regarding concentration of our reinsurance recoverables and the ratings profile of our reinsurers as of June 30, 2018:

Reinsurer(1)	Rating(2)	Amount		Percentage
		($ in millions)
Swiss Reinsurance Company	A+ (Superior)	$	126.9		7.9%
Syndicates at Lloyd’s of London	A (Excellent)		125.1		7.8%
PartnerRe Ltd	A (Excellent)		106.1		6.6%
Fairfax Financial Holdings Ltd	A (Excellent)		93.6		5.8%
W.R. Berkley Corporation	A+ (Superior)		85.6		5.3%
RenaissanceRe Holdings Ltd	A+ (Superior)		85.5		5.3%
Chubb Corporation	A++ (Superior)		79.4		5.0%
Liberty Mutual	A (Excellent)		57.6		3.6%
Kane SAC Ltd(3)	not rated		50.0		3.1%
Hannover Ruck SE	A+ (Superior)		48.1		3.0%
All other reinsurers			744.7		46.6%
Total reinsurance recoverables(4)		$	1,602.6		100.0%
Secured reinsurance recoverables(3)			486.3		30.3%

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

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

(3) Represents reinsurance recoverables secured by funds held, trust agreements or letters of credit.

(4) Approximately 79 percent of our reinsurance recoverables balance as of June 30, 2018 was due from reinsurers having an A.M. Best Company, Inc. financial strength rating of A (Excellent) or higher.

We had no allowance for uncollectible reinsurance as of June 30, 2018.

Critical Accounting Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions about future events that directly affect our reported financial condition and operating performance. More specifically, these estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. We rely on historical experience and on various other assumptions that we believe to be reasonable under the circumstances to make judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from reported results to the extent that estimates and assumptions prove to be inaccurate.

We believe our most critical accounting estimates are those with respect to the liability for unpaid loss and LAE reserves, fair value measurements of certain financial assets, OTTI losses on investments, goodwill and other intangible assets and reinsurance premium revenues, as they require management’s most significant exercise of judgment on both a quantitative and qualitative basis. The accounting estimates that result require the use of assumptions about certain matters that are highly uncertain at the time of estimation. To the extent actual experience differs from the assumptions used, our financial condition, results of operations and cash flows would be affected, possibly materially.

See Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Estimates” of the 2017 Form 10-K for a more complete description of our critical accounting estimates.

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Financial Condition

Parent Level

General. In general, we follow a policy of maintaining a relatively liquid financial condition at our unrestricted holding companies. 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, 2018, we held total marketable securities and cash of $1,299.6 million, compared with $1,383.4 million as of December 31, 2017. The decrease in the six months ended June 30, 2018 primarily reflects a special dividend and repurchases of shares of our common stock, each as discussed below, as well as contributions to Alleghany Capital to fund the acquisition of Hirschfeld by its subsidiary, W&W|AFCO Steel, partially offset by the receipt of dividends from TransRe and RSUI and an increase in the value of the equity securities held at the holding company-level. The $1,299.6 million is comprised of $479.0 million at the Alleghany parent company, $759.3 million at AIHL and $61.3 million at the TransRe holding company. We also hold certain non-marketable investments at our unrestricted holding companies. 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, 2018.

Stockholders’ equity attributable to Alleghany stockholders was approximately $8.4 billion as of June 30, 2018, compared with approximately $8.5 billion as of December 31, 2017. The decrease in stockholders’ equity in the first six months of 2018 primarily reflects a decline in unrealized appreciation on our debt securities portfolio due to an increase in interest rates that occurred in the first six months of 2018, as well as a special dividend and repurchases of our common stock, all as discussed below, partially offset by net earnings. As of June 30, 2018, we had 14,994,679 shares of our common stock outstanding, compared with 15,390,500 shares of our common stock outstanding as of December 31, 2017.

Sale of Subsidiary. On September 12, 2017, AIHL signed a definitive agreement to sell PacificComp to CopperPoint Mutual Insurance Company for total cash consideration of approximately $158 million. The transaction closed on December 31, 2017, at which time: (i) approximately $442 million of PacificComp assets, consisting primarily of debt securities, and approximately $316 million of PacificComp liabilities, consisting primarily of loss and LAE reserves, were transferred; and (ii) AIHL recorded an after-tax gain of approximately $16 million, which included a tax benefit. In connection with the transaction, AIHL Re will continue to provide adverse development reinsurance coverage on PacificComp’s pre-acquisition claims, subject to certain terms and conditions. AIHL Re’s obligations, which are guaranteed by Alleghany, are subject to: (i) an aggregate limit of $150.0 million; and (ii) a final commutation and settlement as of December 31, 2024.

Debt. On September 9, 2014, we completed a public offering of $300.0 million aggregate principal amount of our 4.90% senior notes due on September 15, 2044. On June 26, 2012, we completed a public offering of $400.0 million aggregate principal amount of our 4.95% senior notes due on June 27, 2022. On September 20, 2010, we completed a public offering of $300.0 million aggregate principal amount of our 5.625% senior notes due on September 15, 2020. See Note 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the senior notes.

Credit Agreement. On July 31, 2017, we entered into a five-year credit agreement, or the “Credit Agreement,” with certain lenders party thereto, which provides for an unsecured revolving credit facility in an aggregate principal amount of up to $300.0 million. The credit facility is scheduled to expire on July 31, 2022, unless earlier terminated. Borrowings under the Credit Agreement will be available for working capital and general corporate purposes, including permitted acquisitions and repurchases of Common Stock. Borrowings under the Credit Agreement bear a floating rate of interest based in part on our credit rating, among other factors. The Credit Agreement contains representations, warranties and covenants customary for bank loan facilities of this nature. There were no borrowings under the Credit Agreement from inception through June 30, 2018.

The Credit Agreement replaced our previous four-year credit agreement, or the “Prior Credit Agreement,” which provided for an unsecured revolving credit facility in an aggregate principal amount of up to $200.0 million. The Prior Credit Agreement was terminated on July 31, 2017 in advance of its scheduled October 15, 2017 expiration date. There were no borrowings under the Prior Credit Agreement in the seven months ended July 31, 2017.

Common Stock Repurchases. In November 2015, our Board of Directors authorized the repurchase of shares of our common stock at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million, or the “2015 Repurchase Program.” In June 2018, our Board of Directors authorized, upon the completion of the 2015 Repurchase Program, the repurchase of additional shares of our common stock, at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million. As of June 30, 2018, we had $527.1 million remaining under both share repurchase authorization programs.

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The following table presents the shares of our common stock that we repurchased in the three and six months ended June 30, 2018 and 2017 pursuant to the 2015 Repurchase Program:

	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
Shares repurchased	368,551	-	403,623	-
Cost of shares repurchased (in millions)	$        214.8	$        -	$        236.1	$        -
Average price per share repurchased	$      582.92	$        -	$      584.96	$        -

Special Dividend. In February 2018, the Alleghany Board of Directors declared a special dividend of $10 per share for stockholders of record on March 5, 2018. On March 15, 2018, we paid dividends to stockholders totaling $154.0 million.

Investments in Certain Other Invested Assets. In December 2012, TransRe obtained an ownership interest in Pillar Capital Holdings Limited, or “Pillar Holdings,” a Bermuda-based insurance asset manager focused on collateralized reinsurance and catastrophe insurance-linked securities. Additionally, TransRe invested $175.0 million and AIHL invested $25.0 million in limited partnership funds managed by Pillar Holdings, or the “Funds.” The objective of the Funds is to create portfolios with attractive risk-reward characteristics and low correlation with other asset classes, using the extensive reinsurance and capital market experience of the principals of Pillar Holdings. We have concluded that both Pillar Holdings and the Funds, or collectively, the “Pillar Investments,” represent variable interest entities and that we are not the primary beneficiary, as we do not have the ability to direct the activities that most significantly impact each entity’s economic performance. Therefore, the Pillar Investments are not consolidated and are accounted for under the equity method of accounting. Our potential maximum loss in the Pillar Investments is limited to our cumulative net investment. As of June 30, 2018, our carrying value in the Pillar Investments, as determined under the equity method of accounting, was $219.8 million, which is net of returns of capital received from the Pillar Investments.

In July 2013, AIHL invested $250.0 million in Ares, an asset manager, in exchange for a 6.25 percent equity stake in Ares, with an agreement to engage Ares to manage up to $1.0 billion in certain investment strategies. In May 2014, Ares completed an initial public offering of its common units. Upon completion of the initial public offering, Alleghany’s equity investment in Ares converted into limited partner interests in certain Ares subsidiaries that were convertible into Ares common units. On March 15, 2018, most of AIHL’s limited partner interests were converted into Ares common units. As a result of the conversion and with respect to the limited partnership interests that were converted into Ares common units, AIHL: (i) reclassified its converted interests from other invested assets to equity securities; (ii) increased its carrying value to $208.2 million to reflect the fair value of Ares common units; and (iii) recorded the $45.7 million increase in carrying value as a realized capital gain as of March 15, 2018. As a result of the conversion and with respect to the unconverted limited partnership interests, AIHL: (i) changed its accounting from the equity method to fair value; (ii) increased its carrying value to $58.7 million to reflect the fair value of Ares limited partnership interests; and (iii) recorded the $12.9 million increase in carrying value as a component of net investment income as of March 15, 2018.

Investments in Commercial Mortgage Loans. As of June 30, 2018, the carrying value of our commercial mortgage loan portfolio was $695.8 million, representing the unpaid principal balance on the loans. As of June 30, 2018, there was no allowance for loan losses. The commercial mortgage loan portfolio consists primarily of first mortgages on commercial properties in major metropolitan areas in the U.S. The loans earn interest at fixed- and floating-rates, mature in two to ten years from loan origination and the principal amounts of the loans were no more than approximately two-thirds of the property’s appraised value at the time the loans were made.

Energy Holdings. As of June 30, 2018, we had holdings of $920.0 million, comprised of $289.6 million of debt securities, $487.1 million of equity securities and $143.3 million of our equity attributable to SORC.

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, 2018.

The obligations and cash outflow of our reinsurance and insurance subsidiaries include claim settlements, commission expenses, administrative expenses, purchases of investments, and interest and principal payments on TransRe’s 8.00% senior notes due on November 30, 2039. In addition to premium collections, cash inflow is obtained from interest and dividend income, maturities and sales of investments and reinsurance recoveries. Because cash inflow from premiums is received in advance of cash outflow required to settle claims, our reinsurance and insurance operating units accumulate funds which they invest pending the need for liquidity. As the cash needs of a reinsurance or an insurance company can be unpredictable due to the uncertainty of the claims settlement process, the portfolios of our reinsurance and insurance subsidiaries consist primarily of debt securities and short-term investments to ensure the availability of funds and maintain a sufficient amount of liquid securities.

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Included in Alleghany Capital is debt associated with its operating subsidiaries, which totaled $185.4 million as of June 30, 2018. The $185.4 million includes $95.0 million of borrowings by W&W|AFCO Steel under its available credit facility and term loans (including borrowings incurred and assumed from its acquisition of Hirschfeld), $41.0 million of borrowings by Jazwares under its available credit facility, $19.1 million of term loans at Kentucky Trailer primarily related to borrowings to finance small acquisitions and borrowings under its available credit facility, $15.7 million of borrowings by IPS under its available credit facility, and $14.6 million of term loans at Bourn & Koch related to borrowings to finance an acquisition and borrowings under its available credit facility. None of these liabilities are guaranteed by Alleghany or Alleghany Capital.

With respect to corporate activities, SORC has relied on Alleghany almost entirely to support its operations. From its formation in 2011 through June 30, 2018, we have invested $288.6 million in SORC.

Consolidated Investment Holdings

Investment Strategy and Holdings. Our investment strategy seeks to preserve principal and maintain liquidity while trying to maximize our risk-adjusted, after-tax rate of return. Our investment decisions are guided mainly by the nature and timing of expected liability payouts, management’s forecast of cash flows and the possibility of unexpected cash demands, for example, to satisfy claims due to catastrophe losses. Our consolidated investment portfolio currently consists mainly of highly rated and liquid debt and equity securities listed on national securities exchanges. The overall credit quality of the debt securities portfolio is measured using the lowest rating of Standard & Poor’s Ratings Services, Moody’s Investors Service, Inc. or Fitch Ratings, Inc. In this regard, the overall weighted-average credit quality rating of our debt securities portfolio as of June 30, 2018 and December 31, 2017 was AA-. Although many of our debt securities, which consist predominantly of municipal 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, 2018. The following table presents the ratings of our debt securities portfolio as of June 30, 2018:

	Ratings as of June 30, 2018
	AAA / Aaa		AA / Aa		A		BBB / Baa		Below   BBB / Baa or   Not Rated(1)		Total
	($ in millions)
U.S. Government obligations	$	-	$	993.6	$	-	$	-	$	-	$	993.6
Municipal bonds		261.5		1,879.7		583.7		116.7		0.9		2,842.5
Foreign government obligations		465.9		277.4		180.5		9.1		-		932.9
U.S. corporate bonds		9.5		102.4		844.4		1,012.7		439.4		2,408.4
Foreign corporate bonds		320.5		143.0		550.4		332.3		66.2		1,412.4
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)		15.1		1,089.6		-		49.0		7.0		1,160.7
Commercial mortgage-backed securities (“CMBS”)		155.5		316.2		67.6		1.1		0.2		540.6
Other asset-backed securities		687.8		417.7		350.0		404.8		4.5		1,864.8
Total debt securities	$	1,915.8	$	5,219.6	$	2,576.6	$	1,925.7	$	518.2	$	12,155.9
Percentage of debt securities		15.8%		42.9%		21.2%		15.8%		4.3%		100.0%

(1) Consists of $161.0 million of securities rated BB / Ba, $226.9 million of securities rated B, $38.2 million of securities rated CCC, $2.6 million of securities rated CC, $3.1 million of securities rated below CC and $86.4 million of not-rated securities.

Our debt securities portfolio has been designed to enable management to react to investment opportunities created by changing interest rates, prepayments, tax and credit considerations or other factors, or to circumstances that could result in a mismatch between the desired duration of debt securities and the duration of liabilities and, as such, is classified as AFS.

Effective duration measures a portfolio’s sensitivity to changes in interest rates. In this regard, as of June 30, 2018 and December 31, 2017, our debt securities portfolio had an effective duration of approximately 4.3 years and 4.4 years, respectively. As of June 30, 2018, approximately $3.4 billion, or 28 percent, of our debt securities portfolio represented securities with maturities of five years or less. See Note 3(b) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional detail on the contractual maturities of our consolidated debt securities portfolio. We may increase the proportion of our debt securities portfolio held in securities with maturities of more than five years should the yields of these securities provide, in our judgment, sufficient compensation for their increased risk. We do not believe that this strategy would reduce our ability to meet ongoing claim payments or to respond to significant catastrophe losses.

In the event paid losses accelerate beyond the ability of our reinsurance and insurance subsidiaries to fund these paid losses from current cash balances, current operating cash flow, dividend and interest receipts and security maturities, we would need to liquidate a portion of our investment portfolio, make capital contributions to our reinsurance and insurance subsidiaries, and/or arrange for financing. Strains on liquidity could result from: (i) the occurrence of several significant catastrophe events in a relatively short

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period of time; (ii) the sale of investments into a depressed marketplace to fund these paid losses; (iii) the uncollectibility of reinsurance recoverables on these paid losses; (iv) the significant decrease in the value of collateral supporting reinsurance recoverables; or (v) a significant reduction in our net premium collections.

We may, from time to time, make significant investments in the common stock of a public company, subject to limitations imposed by applicable regulations.

On a consolidated basis, our invested assets decreased to approximately $18.6 billion as of June 30, 2018 from approximately $18.8 billion as of December 31, 2017, primarily reflecting a decline in unrealized appreciation on our debt securities portfolio due to an increase in interest rates that occurred in the first six months of 2018, contributions to Alleghany Capital to fund the acquisition of Hirschfeld by its subsidiary, W&W|AFCO Steel, and repurchases of shares of our common stock, partially offset by an increase in the fair value of equity securities, all as discussed above. The special dividend was funded by the proceeds from the sale of PacificComp at December 31, 2017.

Fair Value. The following table presents the carrying values and estimated fair values of our consolidated financial instruments as of June 30, 2018 and December 31, 2017:

	June 30, 2018				December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	17,401.1	$	17,401.1	$	17,406.5	$	17,406.5
Liabilities
Senior Notes and other debt(2)	$	1,569.4	$	1,697.6	$	1,484.9	$	1,614.6

(1) This table includes debt and equity securities, as well as partnership and non-marketable equity investments carried at fair value that are included in other invested assets. This table excludes investments accounted for using the equity method and commercial mortgage loans that are carried at unpaid principal balance. 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 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the senior notes and other debt.

Fair value is defined as the price that would be received upon the sale of an asset or paid to transfer a liability in an orderly transaction between willing, able and knowledgeable market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. In addition, a three-tiered hierarchy for inputs is 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. A market may be considered 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; as such, little or no weight is given to that transaction as an indicator of fair value.

Although we are responsible for the determination of the fair value of our financial assets and the supporting methodologies and assumptions, we employ third-party valuation service providers to gather, analyze and interpret market information and derive fair values based upon relevant methodologies and assumptions for individual instruments. When those providers are unable to obtain sufficient market observable information upon which to estimate the fair value for a particular security, fair value is determined either by requesting a quote, which is generally non-binding, from brokers who are knowledgeable about these securities or by employing widely accepted internal valuation models.

Valuation service providers typically obtain data about market transactions and other key valuation model inputs from multiple sources and, through the use of widely accepted internal valuation models, provide a single fair value measurement for individual securities for which a fair value has been requested under the terms of service agreements. The inputs used by the valuation service providers include, but are not limited to, market prices from recently completed transactions and transactions of comparable securities, interest rate yield curves, credit spreads, currency rates and other market observable information, as applicable. The valuation models take into account, among other things, market observable information as of the measurement date as well as the specific attributes of the security being valued including its term, interest rate, credit rating, industry sector and, when applicable, collateral quality and other issue or issuer specific information. When market transactions or other market observable data is limited, the extent to which judgment is applied in determining fair value is greatly increased.

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The three-tiered hierarchy used in management’s determination of fair value 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 that we have the ability to access for identical, unrestricted assets and do 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 include publicly traded common stocks and mutual funds (which are included on the balance sheet in equity securities) where our valuations are based on quoted market prices.

• Level 2: Valuations are based on direct and indirect observable inputs other than quoted market prices included in Level 1. Level 2 inputs include quoted prices for similar assets in active markets and inputs other than quoted prices that are observable for the asset, such as 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 (such provisions may apply to all debt securities except U.S. Government obligations). Market-based inputs include interest rates and yield curves that are observable at commonly quoted intervals and current credit rating(s) of the security. Market-based inputs may also include credit spreads of all debt securities except U.S. Government obligations, and currency rates for certain foreign government obligations and foreign corporate bonds denominated in foreign currencies. Fair values are determined using a market approach that relies on the securities’ relationships to quoted prices for similar assets in active markets, as well as the other inputs described above. In determining the fair values for the vast majority of CMBS and other asset-backed securities, as well as a small portion of RMBS, an income approach is used to corroborate and further support the fair values determined by the market approach. The income approach primarily involves developing a discounted cash flow model using the future projected cash flows of the underlying collateral, and the terms of the security. Level 2 assets generally include short-term investments and most debt securities. Our Level 2 liabilities consist of the senior notes.

• Level 3: Valuations are based on techniques that use significant inputs that are unobservable. The valuation of Level 3 assets requires the greatest degree of judgment. These measurements may be made under circumstances in which there is little, if any, market activity for the asset. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment. In making the assessment, we consider factors specific to the asset. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Assets classified as Level 3 principally include certain RMBS, other asset-backed securities (primarily, collateralized loan obligations), U.S. and foreign corporate bonds (including privately issued securities), partnership investments and non-marketable equity investments.

Mortgage-backed and asset-backed securities are initially valued at the transaction price. Subsequently, we use widely accepted valuation practices that produce a fair value measurement. The vast majority of fair values are determined using an income approach. The income approach primarily involves developing a discounted cash flow model using the future projected cash flows of the underlying collateral, as well as other inputs described below. A few Level 3 valuations are based entirely on non-binding broker quotes. These securities consist primarily of mortgage-backed and asset-backed securities where reliable pool and loan level collateral information cannot be reasonably obtained, and as such, an income approach is not feasible.

Since Level 3 valuations are based on techniques that use significant inputs that are unobservable with little or no market activity, the fair values under the market approach for Level 3 securities are less credible than under the income approach; however, the market approach, where feasible, is used to corroborate the fair values determined by the income approach. The market approach primarily relies on the securities’ relationships to quoted transaction prices for similarly structured instruments. To the extent that transaction prices for similarly structured instruments are not available for a particular security, other market approaches are used to corroborate the fair values determined by the income approach, including option adjusted spread analyses.

Unobservable inputs, significant to the measurement and valuation of mortgage-backed and asset-backed securities, are generally used in the income approach, and include assumptions about prepayment speed and collateral performance, including default, delinquency and loss severity rates. Significant changes to any one of these inputs, or combination of inputs, could significantly change the fair value measurement for these securities.

The impact of prepayment speeds on fair value is dependent on a number of variables including whether the securities were purchased at a premium or discount. A decrease in interest rates generally increases the assumed rate of prepayments, and an increase in interest rates generally decreases the assumed speed of prepayments. Increased prepayments increase the yield on securities purchased at a discount and reduce the yield on securities purchased at a premium. In a decreasing prepayment environment, yields on securities purchased at a discount are reduced but are increased for securities purchased at a premium. Changes in default assumptions on underlying collateral are generally accompanied by directionally similar changes in other collateral performance factors, but generally result in a directionally opposite change in prepayment assumptions.

Our Level 3 liabilities consist of the debt of Alleghany Capital’s operating subsidiaries.

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We employ specific control processes to determine the reasonableness of the fair values of our financial assets and liabilities. Our processes are designed to ensure that the values received or internally estimated are accurately recorded and that the data inputs and the valuation techniques used are appropriate, consistently applied and that the assumptions are reasonable and consistent with the objective of determining fair value. We assess the reasonableness of individual security values received from valuation service providers through various analytical techniques. In addition, we validate the reasonableness of fair values by comparing information obtained from our valuation service providers to other third-party valuation sources for selected securities. We also validate prices obtained from brokers for selected securities through reviews by those who have relevant expertise and who are independent of those charged with executing investing transactions.

In addition to such procedures, we review the reasonableness of our classification of securities within the three-tiered hierarchy to ensure that the classification is consistent with GAAP.

The following tables present the estimated fair values of our financial instruments measured at fair value and the level of the fair value hierarchy of inputs used as of June 30, 2018 and December 31, 2017:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of June 30, 2018
Equity securities:
Common stock	$	4,704.2	$	3.6	$	-	$	4,707.8
Preferred stock		-		-		6.3		6.3
Total equity securities		4,704.2		3.6		6.3		4,714.1
Debt securities:
U.S. Government obligations		-		993.6		-		993.6
Municipal bonds		-		2,842.5		-		2,842.5
Foreign government obligations		-		932.9		-		932.9
U.S. corporate bonds		-		2,040.6		367.8		2,408.4
Foreign corporate bonds		-		1,317.6		94.8		1,412.4
Mortgage and asset-backed securities:
RMBS(1)		-		1,160.7		-		1,160.7
CMBS		-		540.6		-		540.6
Other asset-backed securities(2)		-		640.8		1,224.0		1,864.8
Total debt securities		-		10,469.3		1,686.6		12,155.9
Short-term investments		-		472.8		-		472.8
Other invested assets(3)		-		-		58.3		58.3
Total investments (excluding equity method investments and loans)	$	4,704.2	$	10,945.7	$	1,751.2	$	17,401.1
Senior Notes and other debt	$	-	$	1,512.2	$	185.4	$	1,697.6

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	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	4,090.7	$	3.8	$	-	$	4,094.5
Preferred stock		-		3.1		1.9		5.0
Total equity securities		4,090.7		6.9		1.9		4,099.5
Debt securities:
U.S. Government obligations		-		948.0		-		948.0
Municipal bonds		-		3,682.1		-		3,682.1
Foreign government obligations		-		1,006.6		-		1,006.6
U.S. corporate bonds		-		2,173.0		260.0		2,433.0
Foreign corporate bonds		-		1,424.6		75.2		1,499.8
Mortgage and asset-backed securities:
RMBS(1)		-		833.8		161.8		995.6
CMBS		-		550.1		1.6		551.7
Other asset-backed securities(2)		-		503.3		1,101.3		1,604.6
Total debt securities		-		11,121.5		1,599.9		12,721.4
Short-term investments		-		578.1		-		578.1
Other invested assets(3)		-		-		7.5		7.5
Total investments (excluding equity method investments and loans)	$	4,090.7	$	11,706.5	$	1,609.3	$	17,406.5
Senior Notes and other debt	$	-	$	1,513.6	$	101.0	$	1,614.6

(1) Primarily includes government agency pass-through securities guaranteed by a government agency or government sponsored enterprise, among other types of RMBS.

(2) Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

(3) Includes partnership and non-marketable equity investments accounted for at fair value, and excludes investments accounted for using the equity method.

Municipal Bonds. The following table provides the fair value of our municipal bonds as of June 30, 2018, categorized by state and revenue source. Special revenue bonds are debt securities for which the payment of principal and interest is available solely from the cash flows of the related projects. As issuers of revenue bonds do not have the ability to draw from tax revenues or levy taxes to fund obligations, revenue bonds may carry a greater risk of default than general obligation bonds.

	Special Revenue
State	Education		Hospital		Housing		Lease    Revenue		Special Tax		Transit		Utilities		All Other     Sources		Total Special     Revenue		Total General   Obligation		Total Fair   Value
	($ in millions)
New York	$	18.0	$	-	$	-	$	-	$	104.6	$	89.8	$	35.8	$	18.1	$	266.3	$	9.3	$	275.6
Texas		25.1		-		0.2		-		10.6		51.2		73.4		2.3		162.8		69.3		232.1
California		8.6		43.9		-		2.5		1.3		35.2		70.0		-		161.5		60.1		221.6
Massachusetts		18.9		5.5		6.8		-		30.2		30.0		27.6		0.3		119.3		75.7		195.0
Washington		-		-		1.7		-		11.7		13.0		30.7		2.3		59.4		49.9		109.3
Pennsylvania		2.4		1.4		10.3		-		-		26.1		1.1		14.7		56.0		36.6		92.6
District of Columbia		4.7		-		-		-		62.9		13.1		3.9		-		84.6		7.1		91.7
Ohio		43.3		0.6		0.1		-		2.1		-		24.1		3.1		73.3		18.1		91.4
Colorado		23.7		16.1		-		10.1		2.4		8.0		6.2		-		66.5		17.2		83.7
New Jersey		28.3		-		-		-		-		16.4		-		32.4		77.1		-		77.1
All other states		125.6		96.8		24.7		52.5		83.1		80.6		130.5		149.6		743.4		193.7		937.1
Total	$	298.6	$	164.3	$	43.8	$	65.1	$	308.9	$	363.4	$	403.3	$	222.8	$	1,870.2	$	537.0		2,407.2
Total advanced refunded / escrowed maturity funds																						435.3
Total municipal bonds																					$	2,842.5

Recent Accounting Standards

Recently Adopted

In February 2018, the Financial Accounting Standards Board, or the “FASB,” issued guidance on certain tax effects caused by the Tax Act, which was signed into law on December 22, 2017. The Tax Act, among other things, reduced the U.S. corporate federal income tax rate from 35.0 percent to 21.0 percent, effective January 1, 2018 for the 2018 tax year. Under such circumstances, GAAP

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requires that the value of deferred tax assets and liabilities be reduced through tax expense. The new guidance provides an option to reclassify any stranded tax amounts that remain in accumulated other comprehensive income to retained earnings, either retrospectively or at the beginning of the period in which the adoption is elected. This guidance became effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. We adopted this new guidance in the first quarter of 2018 and have elected to reclassify stranded tax amounts that remain in accumulated other comprehensive income, in the amount of approximately $135 million, to retained earnings as of January 1, 2018. See Note 7(b) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for further information on accumulated other comprehensive income, and see Note 9 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the Tax Act and its impact on Alleghany.

In March 2017, the FASB issued guidance that reduces the amortization period for the premium on certain purchased callable debt securities to the earliest call date. The guidance applies specifically to noncontingent call features that are callable at a predetermined and fixed price and date. The accounting for purchased callable debt securities held at a discount is not affected. This guidance is effective in the first quarter of 2019 for public entities with early adoption permitted. We adopted this guidance in the fourth quarter of 2017 and recorded a cumulative effect reduction of approximately $13 million directly to opening 2017 retained earnings and an offsetting increase in opening 2017 accumulated other comprehensive income. The implementation did not have a material impact on our results of operations and financial condition. See Note 7(b) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for further information on accumulated other comprehensive income.

In May 2014, the FASB, together with the International Accounting Standards Board, issued guidance on the recognition of revenue from contracts with customers. Under this guidance, revenue is recognized as the transfer of goods and services to customers takes place and in amounts that reflect the payment or payments that are expected to be received from the customers for those goods and services. This guidance also requires new disclosures about revenue. Revenues related to insurance and reinsurance contracts and revenues from investments are not impacted by this guidance, whereas noninsurance revenues arising from the sale of manufactured goods and services is generally included within the scope of this guidance. This guidance, and all related amendments, became effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. We adopted this guidance in the first quarter of 2018 using the modified retrospective transition approach and the implementation did not have a material impact on our results of operations and financial condition. See Note 10 to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for further information on Alleghany’s noninsurance revenues.

In January 2016, the FASB issued guidance that changes the recognition and measurement of certain financial instruments. This guidance requires investments in equity securities (except those accounted for under the equity method of accounting, but including partnership investments not accounted for under the equity method) to be measured at fair value with changes in fair value recognized in net earnings. For equity securities that do not have readily determinable fair values, measurement may be at cost, adjusted for any impairment and changes resulting from observable price changes for a similar investment of the same issuer. This guidance also changes the presentation and disclosure of financial instruments by: (i) requiring that financial instrument disclosures of fair value use the exit price notion; (ii) requiring separate presentation of financial assets and financial liabilities by measurement category and form, either on the balance sheet or the accompanying notes to the financial statements; (iii) requiring separate presentation in other comprehensive income for the portion of the change in a liability’s fair value resulting from instrument-specific credit risk when an election has been made to measure the liability at fair value; and (iv) eliminating the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost on the balance sheet. This guidance is effective for fiscal years beginning after December 15, 2017 for public entities, including interim periods within those fiscal years. Except for the change in presentation for instrument-specific credit risk, this guidance does not permit early adoption. We adopted this guidance in the first quarter of 2018. As of January 1, 2018, approximately $736 million of net unrealized gains of equity securities, net of deferred taxes, were reclassified from accumulated other comprehensive income to retained earnings. Subsequently, all changes in unrealized gains or losses of equity securities, net of deferred taxes, were presented in the Consolidated Statements of Earnings rather than the Consolidated Statements of Comprehensive Income, under the caption “change in the fair value of equity securities.” Results arising from partnership investments, whether accounted for under the equity method or at fair value, continue to be reported as a component of net investment income. The implementation did not have a material impact on our financial condition. See Note 3 to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for further information on Alleghany’s equity securities, and Note 7(b) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for further information on accumulated other comprehensive income.

Future Application of Accounting Standards

In February 2016, the FASB issued guidance on leases. Under this guidance, a lessee is required to recognize lease liabilities and corresponding right-of-use assets for leases with terms of more than one year, whereas under current guidance, a lessee is only required to recognize assets and liabilities for those leases qualifying as capital leases. This guidance also requires new disclosures about the amount, timing and uncertainty of cash flows arising from leases. The accounting by lessors is to remain largely unchanged. This guidance is effective in the first quarter of 2019 for public entities, with early adoption permitted. A modified retrospective

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transition approach is required for all leases in existence as of, or entered into after, the beginning of the earliest comparative period presented in the financial statements. We will adopt this guidance in the first quarter of 2019 and do not currently believe that the implementation will have a material impact on our results of operations and financial condition. See Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for further information on Alleghany’s leases.

In June 2016, the FASB issued guidance on credit losses. Under this guidance, a company is required to measure all expected credit losses on loans, reinsurance recoverables and other financial assets accounted for at cost or amortized cost, as applicable. Estimates of expected credit losses are to be based on historical experience, current conditions and reasonable and supportable forecasts. Credit losses for securities accounted for on an AFS basis are to be measured in a manner similar to GAAP as currently applied and cannot exceed the amount by which the fair value is less than the amortized cost. Credit losses for all financial assets are to be recorded through an allowance for credit losses. Subsequent reversals in credit loss estimates are permitted and are to be recognized in earnings. This guidance also requires new disclosures about the significant estimates and judgments used in estimating credit losses, as well as the credit quality of financial assets. This guidance is effective in the first quarter of 2020 for public entities, with early adoption permitted. We will adopt this guidance in the first quarter of 2020 and do not currently believe that the implementation will have a material impact on our results of operations and financial condition.

In January 2017, the FASB issued guidance that simplifies the subsequent measurement of goodwill. Under this guidance, if an initial qualitative assessment indicates that the fair value of an operating subsidiary may be less than its carrying amount, an impairment charge is recognized for the amount by which the carrying amount of the operating subsidiary exceeds its estimated fair value. Any resulting impairment loss recognized cannot exceed the total amount of goodwill associated with the operating subsidiary. This guidance is effective in the first quarter of 2020 for public entities, with early adoption permitted. We will adopt this guidance in the first quarter of 2020 and do not currently believe that the implementation will have a material impact on our results of operations and financial condition. See Note 2 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for further information on our goodwill.

In August 2017, the FASB issued guidance that simplifies the requirements to achieve hedge accounting, better reflects the economic results of hedging in the financial statements and improves the alignment between hedge accounting and a company’s risk management activities. This guidance is effective in the first quarter of 2019 for public entities, with early adoption permitted. We will adopt this guidance in the first quarter of 2019 and do not currently believe that the implementation will have a material impact on our results of operations and financial condition.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Market risk is the risk of loss from adverse changes in market prices and rates. The primary market risk related to our debt securities is the risk of loss associated with adverse changes in interest rates. We hold our debt securities as AFS. 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. We also invest in equity securities which are subject to fluctuations in market value. In addition, significant portions of our assets (principally investments) and liabilities (principally loss and LAE reserves and unearned premiums) are exposed to changes in foreign currency exchange rates. The net change in the carrying value of assets and liabilities denominated in foreign currencies is generally recorded as a component of other comprehensive income.

The sensitivity analyses presented below provide only a limited, point-in-time view of the market risk of our financial instruments. The actual impact of changes in market interest rates, equity market prices and foreign currency exchange rates may differ significantly from those shown in these sensitivity analyses. The sensitivity analyses are further limited because they do not consider any actions we could take in response to actual and/or anticipated changes in equity market prices, market interest rates or foreign currency exchange rates. In addition, these sensitivity analyses do not provide weight to risks relating to market issues such as liquidity and the credit worthiness of investments.

Interest Rate Risk

The primary market risk for our debt securities is interest rate risk at the time of refinancing. We monitor the interest rate environment to evaluate reinvestment and refinancing opportunities. We generally do not use derivatives to manage market and interest rate risks. The table below presents a sensitivity analysis as of June 30, 2018 of our (i) consolidated debt securities and (ii) senior notes and other debt, which 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 period. 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, 2018 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. The selected hypothetical changes in interest rates do not reflect what could be the potential best or worst case scenarios.

	-300		-200		-100		0		100		200		300
							($ in millions)
Assets:
Debt securities, fair value	$	13,643.8	$	13,214.7	$	12,687.1	$	12,155.9	$	11,636.8	$	11,142.1	$	10,677.7
Estimated change in fair value		1,487.9		1,058.8		531.2		-		(519.1)		(1,013.8)		(1,478.2)
Liabilities:
Senior Notes and other debt, fair value	$	2,160.8	$	1,980.4	$	1,828.5	$	1,697.6	$	1,589.7	$	1,495.2	$	1,413.4
Estimated change in fair value		463.2		282.8		130.9		-		(107.9)		(202.4)		(284.2)

Equity Risk

Our equity securities are subject to fluctuations in market value. The table below presents our equity market price risk and reflects the effect of a hypothetical increase or decrease in market prices as of June 30, 2018 on the estimated fair value of our consolidated equity portfolio. The selected hypothetical price changes do not reflect what could be the potential best or worst case scenarios.

As of June 30, 2018
($ in millions)
Estimated     Fair Value	Hypothetical Price     Change	Estimated Fair Value   After Hypothetical Change in Price		Hypothetical Percantage Increase (Decrease) in     Stockholders’ Equity
$      4,714.1	20% Increase	$	5,656.9		8.9%
	20% Decrease		3,771.3		(8.9%)

In addition to debt and equity securities, we invest in several partnerships which are subject to fluctuations in market value. Our partnership investments are included in other invested assets and are accounted for at fair value or using the equity method, and had a carrying value of $362.9 million as of June 30, 2018.

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Foreign Currency Exchange Rate Risk

Foreign currency exchange rate risk is the potential change in value arising from changes in foreign currency exchange rates. Our reinsurance operations located in foreign countries maintain some or all of their capital in their local currency and conduct business in their local currency, as well as the currencies of the other countries in which they operate. To mitigate this risk, we maintain investments denominated in certain foreign currencies in which the claims payments will be made. As of June 30, 2018, the largest foreign currency exposures for these foreign operations were the Euro, the Canadian Dollar, the Japanese Yen and the Australian Dollar. The table below presents our foreign currency exchange rate risk and shows the effect of a hypothetical increase or decrease in foreign currency exchange rates against the U.S. Dollar as of June 30, 2018 on the estimated net carrying value of our foreign currency denominated assets, net of our foreign currency denominated liabilities. The selected hypothetical changes do not reflect what could be the potential best or worst case scenarios.

As of June 30, 2018
($ in millions)
Estimated     Fair Value	Hypothetical Price     Change	Estimated Fair Value   After Hypothetical Change in Price		Hypothetical Percantage Increase (Decrease) in   Stockholders’ Equity
$      298.3(1)	20% Increase	$	358.0		0.6%
	20% Decrease		238.6		(0.6%)

(1) Denotes a net asset position as of June 30, 2018.

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 pursuant to Rule 13a-15(e) or 15d-15(e) promulgated under the Securities Exchange Act of 1934, as amended, 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 SEC’s rules and forms and (ii) accumulated and communicated to our management, including our CEO and CFO, as appropriate to allow for 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 quarter ended June 30, 2018 in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Part II. OTHER INFORMATION

Item 1. Legal Proceedings.

Certain of our 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. We believe such provisions are adequate and do not believe that any pending litigation will have a material adverse effect on our consolidated results of operations, financial position or cash flows. See Note 12(a) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

Item 1A. Risk Factors.

There are no material changes from the risk factors set forth in Part I, Item 1A, “Risk Factors” of the 2017 Form 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 presents our common stock repurchases for the quarter ended June 30, 2018:

	Total Number of   Shares Repurchased		Average Price     Paid per Share		Total Number of Shares Purchased as Part of Publicly  Announced Plans  or Programs(1)		Approximate Dollar Value of Shares That May  Yet be Purchased  Under the Plans or Programs(1) (in millions)
April 1 to April 30		101,708	$	592.31		101,708	$	281.7
May 1 to May 31		155,482		576.25		155,482		192.1
June 1 to June 30		111,361		583.65		111,361		527.1
Total		368,551		582.92		368,551

  (1) In November 2015, our Board of Directors authorized the repurchase of shares of common stock, at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million. In June 2018, our Board of Directors authorized, upon the completion of the previously announced program, the repurchase of additional shares of common stock, at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million.

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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 Exchange Act.
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 Exchange Act.
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 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 Form 10-Q.
101	Interactive Data Files formatted in XBRL (Extensible Business Reporting Language): (i) Consolidated Balance Sheets as of June 30, 2018 and December 31, 2017; (ii) Consolidated Statements of Earnings and Comprehensive Income for the three and six months ended June 30, 2018 and 2017; (iii) Consolidated Statements of Cash Flows for the six months ended June 30, 2018 and 2017; and (iv) Notes to Unaudited Consolidated Financial Statements.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) 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 2, 2018	By:	/s/ John L. Sennott, Jr.
		John L. Sennott, Jr. Senior Vice President and chief financial officer (principal financial officer)

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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 the 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 2, 2018

/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, John L. Sennott, Jr., 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 the 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 2, 2018

/s/ John L. Sennott, Jr.

John L. Sennott, Jr.

Senior Vice President and 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, 2018, 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 to my knowledge:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) 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 2, 2018	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, 2018, as filed with the Securities and Exchange Commission (the “Report”), I, John L. Sennott, Jr., 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 to my knowledge:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) 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 2, 2018	By:	/s/ John L. Sennott, Jr.
		John L. Sennott, Jr.
		Senior Vice President and chief financial officer

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 26, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
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		14,936,675

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Securities at fair value:
Available for sale equity securities (cost: 2018 - $3,705,364; 2017 - $3,170,673)		$ 4,099,467
Equity securities (cost: 2018 - $3,705,364; 2017 - $3,170,673)	$ 4,714,079
Debt securities (amortized cost: 2018 - $12,206,035; 2017 - $12,536,772)	12,155,866	12,721,399
Short-term investments	472,830	578,054
Marketable Securities, Total	17,342,775	17,398,920
Other invested assets	605,477	743,358
Total investments	18,644,024	18,800,642
Cash	623,223	838,375
Accrued investment income	97,347	105,877
Premium balances receivable	831,989	797,346
Reinsurance recoverables	1,602,600	1,746,488
Ceded unearned premiums	208,534	190,252
Deferred acquisition costs	468,243	453,346
Property and equipment at cost, net of accumulated depreciation and amortization	197,678	125,337
Goodwill	346,270	334,905
Intangible assets, net of amortization	463,544	459,037
Current taxes receivable	68,396	31,085
Net deferred tax assets	61,806	136,489
Funds held under reinsurance agreements	719,360	706,042
Other assets	752,873	659,096
Total assets	25,085,887	25,384,317
Liabilities, Redeemable Noncontrolling Interests and Stockholders' Equity
Loss and loss adjustment expenses	11,515,493	11,871,250
Unearned premiums	2,279,810	2,182,294
Senior Notes and other debt	1,569,367	1,484,897
Reinsurance payable	159,944	156,376
Other liabilities	1,021,512	1,068,907
Total liabilities	16,546,126	16,763,724
Redeemable noncontrolling interests	135,372	106,530
Common stock (shares authorized: 2018 and 2017 - 22,000,000; shares issued: 2018 and 2017 - 17,459,961)	17,460	17,460
Contributed capital	3,612,615	3,612,109
Accumulated other comprehensive (loss) income	(172,307)	618,118
Treasury stock, at cost (2018 - 2,465,282 shares; 2017 - 2,069,461 shares)	(1,057,885)	(824,906)
Retained earnings	6,004,506	5,091,282
Total stockholders' equity attributable to Alleghany stockholders	8,404,389	8,514,063
Total liabilities, redeemable noncontrolling interest and stockholders' equity	25,085,887	25,384,317
Commercial Mortgage Loan Portfolio
Securities at fair value:
Commercial mortgage loans	$ 695,772	$ 658,364

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available for sale equity securities, cost		$ 3,170,673
Equity securities, cost	$ 3,705,364
Debt securities, amortized cost	$ 12,206,035	$ 12,536,772
Common stock, Shares authorized	22,000,000	22,000,000
Common stock, Shares issued	17,459,961	17,459,961
Treasury stock, shares	2,465,282	2,069,461

XML

Consolidated Statements of Earnings and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Net premiums earned	$ 1,236,959	$ 1,243,929	$ 2,444,815	$ 2,453,117
Net investment income	126,273	101,656	250,399	217,194
Change in the fair value of equity securities	185,245		142,596
Net realized capital gains	6,462	9,268	50,967	68,919
Other than temporary impairment losses		(3,747)		(6,964)
Other than temporary impairment losses			(511)
Total revenues	1,897,664	1,553,918	3,482,618	3,086,370
Costs and Expenses
Net loss and loss adjustment expenses	738,210	734,886	1,408,788	1,434,191
Commissions, brokerage and other underwriting expenses	402,083	413,737	808,378	822,252
Other operating expenses	343,165	225,170	608,062	400,308
Corporate administration	14,119	14,405	21,904	31,290
Amortization of intangible assets	5,966	4,611	11,230	8,375
Interest expense	22,277	20,989	43,808	41,924
Total costs and expenses	1,525,820	1,413,798	2,902,170	2,738,340
Earnings (losses) before income taxes	371,844	140,120	580,448	348,030
Income taxes	73,440	37,461	110,862	96,011
Net earnings	298,404	102,659	469,586	252,019
Net earnings attributable to noncontrolling interest	3,288	848	2,895	1,032
Net earnings attributable to Alleghany stockholders	295,116	101,811	466,691	250,987
Net earnings	298,404	102,659	469,586	252,019
Other comprehensive income:
Change in unrealized gains (losses), net of deferred taxes of ($8,853) and $76,300 for the three months ended June 30, 2018 and 2017, respectively; and of ($47,758) and $143,570 for the six months ended June 30, 2018 and 2017, respectively	(33,305)	141,701	(179,663)	266,630
Less: reclassification for net realized capital gains and other than temporary impairments, net of taxes of ($1,357) and ($1,932) for the three months ended June 30, 2018 and 2017, respectively; and of ($991) and ($21,684) for the six months ended June 30, 2018 and 2017, respectively	(5,105)	(3,589)	(3,726)	(40,271)
Change in unrealized currency translation adjustment, net of deferred taxes of ($2,797) and $5,364 for the three months ended June 30, 2018 and 2017, respectively; and of ($1,442) and $8,083 for the six months ended June 30, 2018 and 2017, respectively	(10,523)	9,962	(5,423)	15,011
Retirement plans	209	98	(1,113)	(297)
Comprehensive income	249,680	250,831	279,661	493,092
Comprehensive income attributable to noncontrolling interests	3,288	848	2,895	1,032
Comprehensive income attributable to Alleghany stockholders	$ 246,392	$ 249,983	$ 276,766	$ 492,060
Basic earnings per share attributable to Alleghany stockholders	$ 19.44	$ 6.60	$ 30.53	$ 16.28
Diluted earnings per share attributable to Alleghany stockholders	$ 19.44	$ 6.60	$ 30.52	$ 16.27
Noninsurance Revenue
Revenues
Noninsurance revenue	$ 342,725	$ 202,812	$ 594,352	$ 354,104

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Consolidated Statements of Earnings and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Change in unrealized gains (losses), deferred taxes	$ (8,853)	$ 76,300	$ (47,758)	$ 143,570
Reclassification for net realized capital gains and other than temporary impairments,taxes	(1,357)	(1,932)	(991)	(21,684)
Change in unrealized currency translation adjustment, deferred taxes	$ (2,797)	$ 5,364	$ (1,442)	$ 8,083

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net earnings	$ 469,586	$ 252,019
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	64,510	69,723
Change in the fair value of equity securities	(142,596)
Net realized capital (gains) losses	(50,967)	(68,919)
Other than temporary impairment losses		6,964
Other than temporary impairment losses	511
(Increase) decrease in reinsurance recoverables, net of reinsurance payable	147,456	109,287
(Increase) decrease in premium balances receivable	(34,643)	(109,073)
(Increase) decrease in ceded unearned premiums	(18,282)	4,057
(Increase) decrease in deferred acquisition costs	(14,897)	(20,683)
(Increase) decrease in funds held under reinsurance agreements	(13,318)	(50,281)
Increase (decrease) in unearned premiums	97,516	78,592
Increase (decrease) in loss and loss adjustment expenses	(355,757)	(26,960)
Change in unrealized foreign currency exchange rate losses (gains)	48,228	(86,834)
Other, net	(48,172)	45,989
Net adjustments	(320,411)	(48,138)
Net cash provided by (used in) operating activities	149,175	203,881
Cash flows from investing activities
Purchases of debt securities	(2,301,614)	(3,313,484)
Purchases of equity securities		(1,849,990)
Purchase of equity securities	(533,842)
Sales of debt securities	1,667,526	2,193,147
Maturities and redemptions of debt securities	886,970	907,309
Sales of equity securities		1,972,117
Sales of equity securities	269,567
Net (purchases) sales of short-term investments	104,728	73,725
Net (purchases) sales and maturities of commercial mortgage loans	(37,408)	(41,659)
(Purchases) sales of property and equipment	(13,164)	16,006
Purchases of affiliates and subsidiaries, net of cash acquired	(108,386)	(164,528)
Other, net	50,415	84,585
Net cash provided by (used in) investing activities	(15,208)	(122,772)
Cash flows from financing activities
Treasury stock acquisitions	(236,103)
Increase (decrease) in other debt	38,452	(26,098)
Cash dividends paid	(153,967)
Other, net	5,317	(15,238)
Net cash provided by (used in) financing activities	(346,301)	(41,336)
Effect of foreign currency exchange rate changes on cash	(2,818)	9,821
Net increase (decrease) in cash	(215,152)	49,594
Cash at beginning of period	838,375	594,091
Cash at end of period	623,223	643,685
Cash paid during period for:
Interest paid	42,562	41,207
Income taxes paid (refund received)	$ 22,135	$ 31,242

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Summary of Significant Accounting Principles

6 Months Ended

Jun. 30, 2018

Summary of Significant Accounting Principles

1. Summary of Significant Accounting Principles

(a) Principles of Financial Statement Presentation

This Quarterly Report on Form 10-Q (this “Form 10-Q”) should be read in conjunction with the Annual Report on Form 10-K for the year ended December 31, 2017 (the “2017 Form 10-K”) and the Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 of Alleghany Corporation (“Alleghany”).

Alleghany Corporation, a Delaware corporation, owns and manages certain operating subsidiaries and investments, anchored by a core position in property and casualty reinsurance and insurance. Through its wholly-owned subsidiary Transatlantic Holdings, Inc. (“TransRe”), Alleghany is engaged in the property and casualty reinsurance business. TransRe has been a subsidiary of Alleghany since March 2012. Through its wholly-owned subsidiary Alleghany Insurance Holdings LLC (“AIHL”) and its subsidiaries, Alleghany is engaged in the property and casualty insurance business. AIHL’s insurance operations are principally conducted by its subsidiaries RSUI Group, Inc. (“RSUI”) and CapSpecialty, Inc. (“CapSpecialty”). RSUI has been a subsidiary of AIHL since July 2003 and CapSpecialty has been a subsidiary of AIHL since January 2002. AIHL Re LLC (“AIHL Re”), a captive reinsurance company which provides reinsurance to Alleghany’s current and former insurance operating subsidiaries and affiliates, has been a subsidiary of Alleghany since its formation in May 2006.

Prior to December 31, 2017, AIHL’s insurance operations also included Pacific Compensation Corporation (“PacificComp”). On September 12, 2017, AIHL signed a definitive agreement to sell PacificComp to CopperPoint Mutual Insurance Company (“CopperPoint”) for total cash consideration of approximately $158 million. The transaction closed on December 31, 2017, at which time: (i) approximately $442 million of PacificComp assets, consisting primarily of debt securities, and approximately $316 million of PacificComp liabilities, consisting primarily of loss and loss adjustment expenses (“LAE”) reserves, were transferred to CopperPoint; and (ii) AIHL recorded an after-tax gain of approximately $16 million, which included a tax benefit. In connection with the transaction, AIHL Re will continue to provide adverse development reinsurance coverage on PacificComp’s pre-acquisition claims, subject to certain terms and conditions. AIHL Re’s obligations, which are guaranteed by Alleghany, are subject to: (i) an aggregate limit of $150.0 million; and (ii) a final commutation and settlement as of December 31, 2024.

Although Alleghany’s primary sources of revenues and earnings are its reinsurance and insurance operations and investments, Alleghany also sources, executes, manages and monitors certain private investments primarily through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s investments include:

• Bourn & Koch, Inc. (“Bourn & Koch”), a manufacturer/remanufacturer of specialty machine tools and supplier of replacement parts, accessories and services for a variety of cutting technologies, headquartered in Rockford, Illinois;

• R.C. Tway Company, LLC (“Kentucky Trailer”), a manufacturer of custom trailers and truck bodies for the moving and storage industry and other markets, headquartered in Louisville, Kentucky;

• IPS-Integrated Project Services, LLC (“IPS”), a technical service provider focused on the global pharmaceutical and biotechnology industries, headquartered in Blue Bell, Pennsylvania;

• Jazwares, LLC (together with its affiliates, “Jazwares”), a global toy, entertainment and musical instrument company, headquartered in Sunrise, Florida;

• WWSC Holdings, LLC (“W&W|AFCO Steel”), a structural steel fabricator and erector, headquartered in Oklahoma City, Oklahoma; and

• a 45 percent equity interest in Wilbert Funeral Services, Inc. (“Wilbert”), a provider of products and services for the funeral and cemetery industries and precast concrete markets, headquartered in Overland Park, Kansas.

The results of W&W|AFCO Steel have been included in Alleghany’s consolidated results beginning with its acquisition by Alleghany Capital on April 28, 2017. On February 7, 2018, W&W|AFCO Steel acquired Hirschfeld Holdings, LP (“Hirschfeld”).

Wilbert is accounted for under the equity method of accounting and is included in other invested assets. The results of Wilbert have been included in Alleghany’s consolidated results beginning with its acquisition by Alleghany Capital on August 1, 2017.

In addition, Alleghany owns certain other holding-company investments. Alleghany’s wholly-owned subsidiary, Stranded Oil Resources Corporation (“SORC”) is an exploration and production company focused on enhanced oil recovery, headquartered in Golden, Colorado. Alleghany’s wholly-owned subsidiary, Alleghany Properties Holdings LLC (“Alleghany Properties”), owns and manages certain properties in the Sacramento, California region. Alleghany’s public equity investments are managed primarily through Alleghany’s wholly-owned subsidiary Roundwood Asset Management LLC.

Unless the context otherwise requires, references to “Alleghany” include Alleghany together with its subsidiaries.

The accompanying 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 U.S. (“GAAP”). All material inter-company balances and transactions have been eliminated in consolidation.

The portion of stockholders’ equity, net earnings and comprehensive income that is not attributable to Alleghany stockholders is presented on the Consolidated Balance Sheets and the Consolidated Statements of Earnings and Comprehensive Income as noncontrolling interests. Because all noncontrolling interests have the option to sell their ownership interests to Alleghany in the future (generally through 2024), the portion of stockholders’ equity that is not attributable to Alleghany stockholders is presented on the Consolidated Balance Sheets as redeemable noncontrolling interests for all periods presented. During the first six months of 2018, the noncontrolling interests outstanding were approximately as follows: Bourn & Koch - 11 percent; Kentucky Trailer - 21 percent; IPS - 16 percent; Jazwares - 23 percent; and W&W|AFCO Steel - 20 percent.

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 as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Alleghany relies on historical experience and on various other assumptions that it believes to be reasonable under the circumstances to make judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from those reported results to the extent that those estimates and assumptions prove to be inaccurate. Changes in estimates are reflected in the Consolidated Statements of Earnings and Comprehensive Income in the period in which the changes are made.

(b) Other Significant Accounting Principles

Alleghany’s significant accounting principles can be found in Note 1 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

(c) Recent Accounting Standards

Recently Adopted

In February 2018, the Financial Accounting Standards Board (the “FASB”) issued guidance on certain tax effects caused by the Tax Cuts and Jobs Act of 2017 (the “Tax Act”), which was signed into law on December 22, 2017. The Tax Act, among other things, reduced the U.S. corporate federal income tax rate from 35.0 percent to 21.0 percent, effective January 1, 2018 for the 2018 tax year. Under such circumstances, GAAP requires that the value of deferred tax assets and liabilities be reduced through tax expense. The new guidance provides an option to reclassify any stranded tax amounts that remain in accumulated other comprehensive income to retained earnings, either retrospectively or at the beginning of the period in which the adoption is elected. This guidance became effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany adopted this new guidance in the first quarter of 2018 and has elected to reclassify stranded tax amounts that remain in accumulated other comprehensive income, in the amount of approximately $135 million, to retained earnings as of January 1, 2018. See Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income, and see Note 9 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the Tax Act and its impact on Alleghany.

In March 2017, the FASB issued guidance that reduces the amortization period for the premium on certain purchased callable debt securities to the earliest call date. The guidance applies specifically to noncontingent call features that are callable at a predetermined and fixed price and date. The accounting for purchased callable debt securities held at a discount is not affected. This guidance is effective in the first quarter of 2019 for public entities with early adoption permitted. Alleghany adopted this guidance in the fourth quarter of 2017 and recorded a cumulative effect reduction of approximately $13 million directly to opening 2017 retained earnings and an offsetting increase in opening 2017 accumulated other comprehensive income. The implementation did not have a material impact on Alleghany’s results of operations and financial condition. See Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income.

In May 2014, the FASB, together with the International Accounting Standards Board, issued guidance on the recognition of revenue from contracts with customers. Under this guidance, revenue is recognized as the transfer of goods and services to customers takes place and in amounts that reflect the payment or payments that are expected to be received from the customers for those goods and services. This guidance also requires new disclosures about revenue. Revenues related to insurance and reinsurance contracts and revenues from investments are not impacted by this guidance, whereas noninsurance revenues arising from the sale of manufactured goods and services is generally included within the scope of this guidance. This guidance, and all related amendments, became effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany adopted this guidance in the first quarter of 2018 using the modified retrospective transition approach and the implementation did not have a material impact on its results of operations and financial condition. See Note 10 of this Form 10-Q for further information on Alleghany’s noninsurance revenues.

In January 2016, the FASB issued guidance that changes the recognition and measurement of certain financial instruments. This guidance requires investments in equity securities (except those accounted for under the equity method of accounting, but including partnership investments not accounted for under the equity method) to be measured at fair value with changes in fair value recognized in net earnings. For equity securities that do not have readily determinable fair values, measurement may be at cost, adjusted for any impairment and changes resulting from observable price changes for a similar investment of the same issuer. This guidance also changes the presentation and disclosure of financial instruments by: (i) requiring that financial instrument disclosures of fair value use the exit price notion; (ii) requiring separate presentation of financial assets and financial liabilities by measurement category and form, either on the balance sheet or the accompanying notes to the financial statements; (iii) requiring separate presentation in other comprehensive income for the portion of the change in a liability’s fair value resulting from instrument-specific credit risk when an election has been made to measure the liability at fair value; and (iv) eliminating the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost on the balance sheet. This guidance is effective for fiscal years beginning after December 15, 2017 for public entities, including interim periods within those fiscal years. Except for the change in presentation for instrument-specific credit risk, this guidance does not permit early adoption. Alleghany adopted this guidance in the first quarter of 2018. As of January 1, 2018, approximately $736 million of net unrealized gains of equity securities, net of deferred taxes, were reclassified from accumulated other comprehensive income to retained earnings. Subsequently, all changes in unrealized gains or losses of equity securities, net of deferred taxes, were presented in the Consolidated Statements of Earnings rather than the Consolidated Statements of Comprehensive Income, under the caption “change in the fair value of equity securities.” Results arising from partnership investments, whether accounted for under the equity method or at fair value, continue to be reported as a component of net investment income. The implementation did not have a material impact on Alleghany’s financial condition. See Note 3 of this Form 10-Q for further information on Alleghany’s equity securities, and Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income.

Future Application of Accounting Standards

In February 2016, the FASB issued guidance on leases. Under this guidance, a lessee is required to recognize lease liabilities and corresponding right-of-use assets for leases with terms of more than one year, whereas under current guidance, a lessee is only required to recognize assets and liabilities for those leases qualifying as capital leases. This guidance also requires new disclosures about the amount, timing and uncertainty of cash flows arising from leases. The accounting by lessors is to remain largely unchanged. This guidance is effective in the first quarter of 2019 for public entities, with early adoption permitted. A modified retrospective transition approach is required for all leases in existence as of, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Alleghany will adopt this guidance in the first quarter of 2019 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition. See Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for further information on Alleghany’s leases.

In June 2016, the FASB issued guidance on credit losses. Under this guidance, a company is required to measure all expected credit losses on loans, reinsurance recoverables and other financial assets accounted for at cost or amortized cost, as applicable. Estimates of expected credit losses are to be based on historical experience, current conditions and reasonable and supportable forecasts. Credit losses for securities accounted for on an available-for-sale (“AFS”) basis are to be measured in a manner similar to GAAP as currently applied and cannot exceed the amount by which the fair value is less than the amortized cost. Credit losses for all financial assets are to be recorded through an allowance for credit losses. Subsequent reversals in credit loss estimates are permitted and are to be recognized in earnings. This guidance also requires new disclosures about the significant estimates and judgments used in estimating credit losses, as well as the credit quality of financial assets. This guidance is effective in the first quarter of 2020 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2020 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

In January 2017, the FASB issued guidance that simplifies the subsequent measurement of goodwill. Under this guidance, if an initial qualitative assessment indicates that the fair value of an operating subsidiary may be less than its carrying amount, an impairment charge is recognized for the amount by which the carrying amount of the operating subsidiary exceeds its estimated fair value. Any resulting impairment loss recognized cannot exceed the total amount of goodwill associated with the operating subsidiary. This guidance is effective in the first quarter of 2020 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2020 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition. See Note 2 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for further information on Alleghany’s goodwill.

In August 2017, the FASB issued guidance that simplifies the requirements to achieve hedge accounting, better reflects the economic results of hedging in the financial statements and improves the alignment between hedge accounting and a company’s risk management activities. This guidance is effective in the first quarter of 2019 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2019 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2018

Fair Value of Financial Instruments

2. Fair Value of Financial Instruments

The following table presents the carrying value and estimated fair value of Alleghany’s consolidated financial instruments as of June 30, 2018 and December 31, 2017:

	June 30, 2018				December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	17,401.1	$	17,401.1	$	17,406.5	$	17,406.5
Liabilities
Senior Notes and other debt(2)	$	1,569.4	$	1,697.6	$	1,484.9	$	1,614.6

(1) This table includes debt and equity securities, as well as partnership and non-marketable equity investments carried at fair value that are included in other invested assets. This table excludes investments accounted for using the equity method and commercial mortgage loans that are carried at unpaid principal balance. 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 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the senior notes and other debt.

The following tables present Alleghany’s financial instruments measured at fair value and the level of the fair value hierarchy of inputs used as of June 30, 2018 and December 31, 2017:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of June 30, 2018
Equity securities:
Common stock	$	4,704.2	$	3.6	$	-	$	4,707.8
Preferred stock		-		-		6.3		6.3
Total equity securities		4,704.2		3.6		6.3		4,714.1
Debt securities:
U.S. Government obligations		-		993.6		-		993.6
Municipal bonds		-		2,842.5		-		2,842.5
Foreign government obligations		-		932.9		-		932.9
U.S. corporate bonds		-		2,040.6		367.8		2,408.4
Foreign corporate bonds		-		1,317.6		94.8		1,412.4
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		-		1,160.7		-		1,160.7
Commercial mortgage-backed securities (“CMBS”)		-		540.6		-		540.6
Other asset-backed securities(2)		-		640.8		1,224.0		1,864.8
Total debt securities		-		10,469.3		1,686.6		12,155.9
Short-term investments		-		472.8		-		472.8
Other invested assets(3)		-		-		58.3		58.3
Total investments (excluding equity method investments and loans)	$	4,704.2	$	10,945.7	$	1,751.2	$	17,401.1
Senior Notes and other debt	$	-	$	1,512.2	$	185.4	$	1,697.6

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	4,090.7	$	3.8	$	-	$	4,094.5
Preferred stock		-		3.1		1.9		5.0
Total equity securities		4,090.7		6.9		1.9		4,099.5
Debt securities:
U.S. Government obligations		-		948.0		-		948.0
Municipal bonds		-		3,682.1		-		3,682.1
Foreign government obligations		-		1,006.6		-		1,006.6
U.S. corporate bonds		-		2,173.0		260.0		2,433.0
Foreign corporate bonds		-		1,424.6		75.2		1,499.8
Mortgage and asset-backed securities:
RMBS(1)		-		833.8		161.8		995.6
CMBS		-		550.1		1.6		551.7
Other asset-backed securities(2)		-		503.3		1,101.3		1,604.6
Total debt securities		-		11,121.5		1,599.9		12,721.4
Short-term investments		-		578.1		-		578.1
Other invested assets(3)		-		-		7.5		7.5
Total investments (excluding equity method investments and loans)	$	4,090.7	$	11,706.5	$	1,609.3	$	17,406.5
Senior Notes and other debt	$	-	$	1,513.6	$	101.0	$	1,614.6

(1) Primarily includes government agency pass-through securities guaranteed by a government agency or government sponsored enterprise, among other types of RMBS.

(2) Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

(3) Includes partnership and non-marketable equity investments accounted for at fair value, and excludes investments accounted for using the equity method.

In the three and six months ended June 30, 2018, Alleghany transferred out of Level 3 $151.9 million and $153.5 million, respectively, of financial instruments, principally due to an increase in observable inputs related to the valuation of such assets. Specifically, during the second quarter of 2018, there was a decrease in the weight given to non-binding broker quotes, and as such, there was a corresponding increase in quoted prices for similar assets in active markets. Of the $153.5 million of transfers, $150.6 million related to RMBS in the second quarter of 2018, $1.6 million related to CMBS in the first quarter of 2018 and $1.3 million related to U.S. corporate bonds in the second quarter of 2018.

As further described in Note 3(h), on March 15, 2018, most of AIHL’s limited partnership interests in certain subsidiaries of Ares Management LLC (“Ares”) were converted into Ares common units. As a result of the conversion, as of March 15, 2018, $208.2 million of Ares common units, classified as common stock, was transferred into Level 1, and $58.7 million of Ares limited partner interests, classified as other invested assets, was transferred into Level 3.

In addition to the above, in the three and six months ended June 30, 2018, Alleghany transferred into Level 3 $1.3 million and $5.6 million, respectively, of financial instruments, principally due to a decrease in observable inputs related to the valuation of such assets and, specifically, a decrease in broker quotes. Of the $5.6 million of transfers, $4.3 million related to preferred stock, $1.2 million related to U.S. corporate bonds, and $0.1 million related to other invested assets. There were no other material transfers between Levels 1, 2 or 3 in the three and six months ended June 30, 2018.

In the three and six months ended June 30, 2017, Alleghany transferred out of Level 3 $3.1 million and $7.2 million, respectively, of financial instruments that were principally due to an increase in observable inputs related to the valuation of such assets and, specifically, an increase in broker quotes. Of the $7.2 million of transfers, $4.8 million related to U.S. corporate bonds and $2.4 million related to common stock.

In the three and six months ended June 30, 2017, Alleghany transferred into Level 3 $2.1 million and $4.7 million, respectively, of financial instruments that were principally due to a decrease in observable inputs related to the valuation of such assets and, specifically, a decrease in broker quotes. Of the $4.7 million of transfers, $3.0 million related to U.S. corporate bonds, $1.4 million related to common stock and $0.3 million related to foreign corporate bonds. There were no other material transfers between Levels 1, 2 or 3 in the three and six months ended June 30, 2017.

The following tables present reconciliations of the changes during the six months ended June 30, 2018 and 2017 in Level 3 assets measured at fair value:

							Debt Securities
													Mortgage and asset-backed
Six Months Ended June 30, 2018				Preferred   Stock			U.S.   Corporate   Bonds			Foreign   Corporate   Bonds			RMBS			CMBS			Other Asset- backed     Securities			Other       Invested       Assets(1)			Total
				($ in millions)
Balance as of January 1, 2018				$	1.9		$	260.0		$	75.2		$	161.8		$	1.6		$	1,101.3		$	7.5		$	1,609.3
Net realized/unrealized gains (losses) included in:
Net earnings(2)					-			-			(0.1	)		(0.3	)		-			1.0			1.1			1.7
Other comprehensive income					0.2			(6.9	)		(2.2	)		(5.3	)		-			(7.7	)		(3.5	)		(25.4	)
Purchases					-			117.3			23.8			-			-			495.1			-			636.2
Sales					(0.1	)		(2.5	)		(1.9	)		(5.6	)		-			(365.7	)		(5.6	)		(381.4	)
Issuances					-			-			-			-			-			-			-			-
Settlements					-			-			-			-			-			-			-			-
Transfers into Level 3					4.3			1.2			-			-			-			-			58.8			64.3
Transfers out of Level 3					-			(1.3	)		-			(150.6	)		(1.6	)		-			-			(153.5	)
Balance as of June 30, 2018				$	6.3		$	367.8		$	94.8		$	-		$	-		$	1,224.0		$	58.3		$	1,751.2
	Equity Securities						Debt Securities
													Mortgage and asset-backed
Six Months Ended June 30, 2017	Common   Stock			Preferred   Stock			U.S.   Corporate   Bonds			Foreign   Corporate   Bonds			RMBS			CMBS			Other Asset- backed     Securities			Other       Invested       Assets(1)			Total
													($ in millions)
Balance as of January 1, 2017	$	4.3		$	-		$	72.9		$	0.4		$	5.9		$	4.3		$	903.8		$	28.1		$	1,019.7
Net realized/unrealized gains (losses) included in:
Net earnings(2)		(0.1	)		-			(0.3	)		-			0.1			-			2.7			10.8			13.2
Other comprehensive income		0.5			-			1.5			0.4			0.2			0.1			11.9			(10.6	)		4.0
Purchases		-			2.4			151.4			36.0			-			-			578.0			-			767.8
Sales		(1.8	)		(0.2	)		(4.3	)		(0.1	)		-			(2.2	)		(19.7	)		(21.6	)		(49.9	)
Issuances		-			-			-			-			-			-			-			-			-
Settlements		-			-			(4.4	)		-			(0.7	)		(0.3	)		(315.8	)		-			(321.2	)
Transfers into Level 3		1.4			-			3.0			0.3			-			-			-			-			4.7
Transfers out of Level 3		(2.4	)		-			(4.8	)		-			-			-			-			-			(7.2	)
Balance as of June 30, 2017	$	1.9		$	2.2		$	215.0		$	37.0		$	5.5		$	1.9		$	1,160.9		$	6.7		$	1,431.1

(1) Includes partnership and non-marketable equity investments accounted for at fair value.

(2) There were no other than temporary impairment (“OTTI”) losses recorded in net earnings related to Level 3 assets still held as of June 30, 2018 and 2017.

Net unrealized losses related to Level 3 assets as of June 30, 2018 and December 31, 2017 were not material.

See Note 1(c) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for Alleghany’s accounting policy on fair value.

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Investments

6 Months Ended

Jun. 30, 2018

Investments

3. Investments

(a) Unrealized Gains and Losses

The following tables present the amortized cost or cost and the fair value of AFS securities as of June 30, 2018 and December 31, 2017:

	Amortized Cost or Cost		Gross   Unrealized   Gains		Gross   Unrealized   Losses		Fair Value
	($ in millions)
As of June 30, 2018
Debt securities:
U.S. Government obligations	$	1,026.0	$	0.6	$	(33.0)	$	993.6
Municipal bonds		2,803.5		56.1		(17.1)		2,842.5
Foreign government obligations		929.3		9.3		(5.7)		932.9
U.S. corporate bonds		2,432.4		17.9		(41.9)		2,408.4
Foreign corporate bonds		1,418.5		12.9		(19.0)		1,412.4
Mortgage and asset-backed securities:
RMBS		1,184.1		3.3		(26.7)		1,160.7
CMBS		545.5		2.5		(7.4)		540.6
Other asset-backed securities(1)		1,866.7		4.9		(6.8)		1,864.8
Total debt securities		12,206.0		107.5		(157.6)		12,155.9
Short-term investments		472.8		-		-		472.8
Total investments	$	12,678.8	$	107.5	$	(157.6)	$	12,628.7
	Amortized Cost or Cost		Gross   Unrealized   Gains		Gross   Unrealized   Losses		Fair Value
			($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	3,165.8	$	932.5	$	(3.8)	$	4,094.5
Preferred stock		4.9		0.1		-		5.0
Total equity securities		3,170.7		932.6		(3.8)		4,099.5
Debt securities:
U.S. Government obligations		963.9		1.7		(17.6)		948.0
Municipal bonds		3,578.9		109.8		(6.6)		3,682.1
Foreign government obligations		1,000.1		11.2		(4.7)		1,006.6
U.S. corporate bonds		2,381.1		61.6		(9.7)		2,433.0
Foreign corporate bonds		1,481.8		24.5		(6.5)		1,499.8
Mortgage and asset-backed securities:
RMBS		993.9		6.3		(4.6)		995.6
CMBS		545.0		9.0		(2.3)		551.7
Other asset-backed securities(1)		1,592.1		13.8		(1.3)		1,604.6
Total debt securities		12,536.8		237.9		(53.3)		12,721.4
Short-term investments		578.1		-		-		578.1
Total investments	$	16,285.6	$	1,170.5	$	(57.1)	$	17,399.0

(1) Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

(b) Contractual Maturity

The following table presents the amortized cost or cost and estimated fair value of debt securities by contractual maturity as of June 30, 2018. 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 or Cost		Fair Value
	($ in millions)
As of June 30, 2018
Short-term investments due in one year or less	$	472.8	$	472.8
Mortgage and asset-backed securities(1)		3,596.3		3,566.1
Debt securities with maturity dates:
One year or less		348.2		348.2
Over one through five years		3,042.6		3,024.8
Over five through ten years		2,997.0		2,973.6
Over ten years		2,221.9		2,243.2
Total debt securities	$	12,206.0	$	12,155.9

(1) Mortgage and asset-backed securities by their nature do not generally have single maturity dates.

(c) Net Investment Income

The following table presents net investment income for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
	($ in millions)
Interest income	$	104.8		$	102.5		$	206.8		$	201.7
Dividend income		22.3			11.8			38.6			21.2
Investment expenses		(6.6	)		(6.9	)		(18.6	)		(14.3	)
Pillar Investments(1)		1.9			3.2			1.9			6.6
Limited partnership interests in certain subsidiaries of Ares(1)		(0.7	)		(12.6	)		13.2			(7.4	)
Other investment results		4.6			3.7			8.5			9.4
Total	$	126.3		$	101.7		$	250.4		$	217.2

(1) See Note 3(h) of this Form 10-Q for discussion of the Pillar Investments, as defined therein, and limited partnership interests in certain subsidiaries of Ares.

As of June 30, 2018, non-income producing invested assets were immaterial.

(d) Change in the Fair Value of Equity Securities

In the first quarter of 2018, Alleghany adopted new investment accounting guidance, which requires changes in the fair value of equity securities, except those accounted for under the equity method, to be recognized in net earnings. In earlier periods, equity securities were considered to be AFS and were included in the analysis of OTTI. See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of this new guidance.

The following table presents increases in the fair value of equity securities for the three and six months ended June 30, 2018:

	Three Months Ended		Six Months Ended
	June 30, 2018		June 30, 2018
	($ in millions)
Change in the fair value of equity securities sold during the period	$	4.4	$	16.0
Change in the fair value of equity securities held at the end of the period		180.8		126.6
Change in the fair value of equity securities	$	185.2	$	142.6

(e) Realized Gains and Losses

The proceeds from sales of debt and equity securities were $0.8 billion and $1.5 billion for the three months ended June 30, 2018 and 2017, respectively, and $1.9 billion and $4.2 billion for the six months ended June 30, 2018 and 2017, respectively.

Realized capital gains and losses for the three months ended June 30, 2018 primarily reflect the sale of debt securities. Realized capital gains and losses for the first six months of 2018 primarily reflect a $45.7 million gain on AIHL’s conversion of its limited partnership interests in certain subsidiaries of Ares into Ares common units. See Note 3(h) of this Form 10-Q for additional information on this conversion.

Realized capital gains and losses for the three and six months ended June 30, 2017 primarily reflect the sale of equity securities. Realized capital gains for the first six months of 2017 also include the sale of certain equity securities resulting from a partial restructuring of the equity portfolio.

The following table presents amounts of gross realized capital gains and gross realized capital losses for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	($ in millions)
Gross realized capital gains	$	6.5	$	34.0	$	66.4	$	142.7
Gross realized capital losses		-		(24.7)		(15.4)		(73.8)
Net realized capital gains	$	6.5	$	9.3	$	51.0	$	68.9

Gross realized loss amounts exclude OTTI losses, as discussed below.

(f) OTTI Losses

Alleghany holds its debt securities as AFS and, as such, these securities are recorded at fair value. Alleghany continually monitors the difference between amortized cost and the estimated fair value of its debt investments, which involves uncertainty as to whether declines in value are temporary in nature. The analysis of a security’s decline in value is performed in its functional currency. If the decline 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 its amortized cost-basis down to the fair value of the security and records an OTTI loss on its statement of earnings. In addition, any portion of such decline related to a debt security that is believed to arise from factors other than credit is recorded as a component of other comprehensive income rather than charged against earnings.

Debt securities in an unrealized loss position are evaluated for OTTI if they meet any of the following criteria: (i) they are trading at a discount of at least 20 percent to amortized cost for an extended period of time (nine consecutive months or more); (ii) there has been a negative credit or news event with respect to the issuer that could indicate the existence of an OTTI; or (iii) Alleghany intends to sell, or it is more likely than not that Alleghany will sell, the debt security before recovery of its amortized cost basis.

If Alleghany intends to sell, or it is more likely than not that Alleghany will sell, a debt security before recovery of its amortized cost basis, the total amount of the unrealized loss position is recognized as an OTTI loss in earnings. To the extent that a debt security that is in an unrealized loss position is not impaired based on the preceding, Alleghany will consider a debt security to be impaired when it believes it to be probable that Alleghany will not be able to collect the entire amortized cost basis. For debt securities in an unrealized loss position as of the end of each quarter, Alleghany develops a best estimate of the present value of expected cash flows. If the results of the cash flow analysis indicate that Alleghany will not recover the full amount of its amortized cost basis in the debt security, Alleghany records an OTTI loss in earnings equal to the difference between the present value of expected cash flows and the amortized cost basis of the debt security. If applicable, the difference between the total unrealized loss position on the debt security and the OTTI loss recognized in earnings is the non-credit related portion, which is recorded as a component of other comprehensive income.

In developing the cash flow analyses for debt securities, Alleghany considers various factors for the different categories of debt securities. For municipal bonds, Alleghany takes into account the taxing power of the issuer, source of revenue, credit risk and enhancements and pre-refunding. For mortgage and asset-backed securities, Alleghany discounts its best estimate of future cash flows at an effective rate equal to the original effective yield of the security or, in the case of floating rate securities, at the current coupon. Alleghany’s models include assumptions about prepayment speeds, default and delinquency rates, underlying collateral (if any), credit ratings, credit enhancements and other observable market data. For corporate bonds, Alleghany reviews business prospects, credit ratings and available information from asset managers and rating agencies for individual securities.

OTTI losses in the first six months of 2018 reflect $0.5 million of unrealized losses on debt securities that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $0.5 million of OTTI losses, none were incurred in the second quarter of 2018.

OTTI losses in the first six months of 2017 reflect $7.0 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $7.0 million of OTTI losses, $6.8 million related to equity securities, primarily in the retail sector, and $0.2 million related to debt securities. The determination that unrealized losses on the securities were other than temporary was primarily due to the duration of the decline in the fair value of equity and debt securities relative to their costs. Of the $7.0 million of OTTI losses, $3.8 million was incurred in the second quarter of 2017.

Upon the ultimate disposition of the securities for which OTTI losses have been recorded, a portion of the loss may be recoverable depending on market conditions at the time of disposition. After adjusting the amortized cost basis of securities for the recognition of OTTI losses, the remaining gross unrealized investment losses for debt securities as of June 30, 2018 were deemed to be temporary, based on, among other factors: (i) the duration of time and the relative magnitude to which the fair value of these investments had been below cost were not indicative of an OTTI loss; (ii) the absence of compelling evidence that would cause Alleghany to call into question the financial condition or near-term business prospects of the issuer of the security; and (iii) Alleghany’s ability and intent to hold the security for a period of time sufficient to allow for any anticipated recovery.

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’s methodology for assessing other than temporary declines in value contains inherent risks and uncertainties which 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 conditions or social trends, interest rates or credit ratings.

(g) Aging of Gross Unrealized Losses

The following tables present gross unrealized losses and related fair values for Alleghany’s AFS securities, grouped by duration of time in a continuous unrealized loss position, as of June 30, 2018 and December 31, 2017:

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	($ in millions)
As of June 30, 2018
Debt securities:
U.S. Government obligations	$	532.8	$	12.7	$	390.1	$	20.3	$	922.9	$	33.0
Municipal bonds		543.2		8.2		215.2		8.9		758.4		17.1
Foreign government obligations		189.9		2.1		130.5		3.6		320.4		5.7
U.S. corporate bonds		1,355.7		32.1		174.1		9.8		1,529.8		41.9
Foreign corporate bonds		656.7		12.7		189.2		6.3		845.9		19.0
Mortgage and asset-backed securities:
RMBS		887.3		21.3		116.5		5.4		1,003.8		26.7
CMBS		277.9		4.6		32.3		2.8		310.2		7.4
Other asset-backed securities		982.2		6.4		27.7		0.4		1,009.9		6.8
Total temporarily impaired securities	$	5,425.7	$	100.1	$	1,275.6	$	57.5	$	6,701.3	$	157.6

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	145.7	$	3.8	$	-	$	-	$	145.7	$	3.8
Preferred stock		-		-		-		-		-		-
Total equity securities		145.7		3.8		-		-		145.7		3.8
Debt securities:
U.S. Government obligations		447.8		4.4		416.6		13.2		864.4		17.6
Municipal bonds		240.0		1.5		267.3		5.1		507.3		6.6
Foreign government obligations		321.9		2.7		72.2		2.0		394.1		4.7
U.S. corporate bonds		568.8		6.1		207.3		3.6		776.1		9.7
Foreign corporate bonds		417.4		3.0		159.4		3.5		576.8		6.5
Mortgage and asset-backed securities:
RMBS		284.2		1.6		131.5		3.0		415.7		4.6
CMBS		112.2		0.5		34.7		1.8		146.9		2.3
Other asset-backed securities		211.1		0.9		65.7		0.4		276.8		1.3
Total debt securities		2,603.4		20.7		1,354.7		32.6		3,958.1		53.3
Total temporarily impaired securities	$	2,749.1	$	24.5	$	1,354.7	$	32.6	$	4,103.8	$	57.1

As of June 30, 2018, Alleghany held a total of 1,995 debt securities that were in an unrealized loss position, of which 430 securities were in an unrealized loss position continuously for 12 months or more. The unrealized losses associated with these debt securities consisted primarily of losses related primarily to U.S. Government obligations, U.S. corporate bonds, municipal bonds, foreign corporate bonds and RMBS.

As of June 30, 2018, the vast majority of Alleghany’s debt securities were rated investment grade, with 4.3 percent of debt securities having issuer credit ratings that were below investment grade or not rated, compared with 5.3 percent as of December 31, 2017.

(h) Investments in Certain Other Invested Assets

In December 2012, TransRe obtained an ownership interest in Pillar Capital Holdings Limited (“Pillar Holdings”), a Bermuda-based insurance asset manager focused on collateralized reinsurance and catastrophe insurance-linked securities. Additionally, TransRe invested $175.0 million and AIHL invested $25.0 million in limited partnership funds managed by Pillar Holdings (the “Funds”). The objective of the Funds is to create portfolios with attractive risk-reward characteristics and low correlation with other asset classes, using the extensive reinsurance and capital market experience of the principals of Pillar Holdings. Alleghany has concluded that both Pillar Holdings and the Funds (collectively, the “Pillar Investments”) represent variable interest entities and that Alleghany is not the primary beneficiary, as it does not have the ability to direct the activities that most significantly impact each entity’s economic performance. Therefore, the Pillar Investments are not consolidated and are accounted for under the equity method of accounting. Alleghany’s potential maximum loss in the Pillar Investments is limited to its cumulative net investment. As of June 30, 2018, Alleghany’s carrying value in the Pillar Investments, as determined under the equity method of accounting, was $219.8 million, which is net of returns of capital received from the Pillar Investments.

In July 2013, AIHL invested $250.0 million in Ares, an asset manager, in exchange for a 6.25 percent equity stake in Ares, with an agreement to engage Ares to manage up to $1.0 billion in certain investment strategies. In May 2014, Ares completed an initial public offering of its common units. Upon completion of the initial public offering, Alleghany’s equity investment in Ares converted into limited partner interests in certain Ares subsidiaries that were convertible into Ares common units. On March 15, 2018, most of AIHL’s limited partner interests were converted into Ares common units. As a result of the conversion and with respect to the limited partnership interests that were converted into Ares common units, AIHL: (i) reclassified its converted interests from other invested assets to equity securities; (ii) increased its carrying value to $208.2 million to reflect the fair value of Ares common units; and (iii) recorded the $45.7 million increase in carrying value as a realized capital gain as of March 15, 2018. As a result of the conversion and with respect to the unconverted limited partnership interests, AIHL: (i) changed its accounting from the equity method to fair value; (ii) increased its carrying value to $58.7 million to reflect the fair value of Ares limited partnership interests; and (iii) recorded the $12.9 million increase in carrying value as a component of net investment income as of March 15, 2018.    

(i) Investments in Commercial Mortgage Loans

As of June 30, 2018, the carrying value of Alleghany’s commercial mortgage loan portfolio was $695.8 million, representing the unpaid principal balance on the loans. As of June 30, 2018, there was no allowance for loan losses. The commercial mortgage loan portfolio consists primarily of first mortgages on commercial properties in major metropolitan areas in the U.S. The loans earn interest at fixed- and floating-rates, mature in two to ten years from loan origination and the principal amounts of the loans were no more than approximately two-thirds of the property’s appraised value at the time the loans were made.

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Reinsurance Ceded

6 Months Ended

Jun. 30, 2018

Reinsurance Ceded

4. Reinsurance Ceded

Alleghany’s reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite in order to reduce the effect of individual or aggregate exposure to losses, manage capacity, protect capital resources, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns and enable them to increase gross premium writings and risk capacity without requiring additional capital. Alleghany’s reinsurance and insurance subsidiaries purchase reinsurance and retrocessional coverages from highly-rated third-party reinsurers. If the assuming reinsurers are unable or unwilling to meet the obligations assumed under the applicable reinsurance agreements, Alleghany’s reinsurance and insurance subsidiaries would remain liable for such reinsurance portion not paid by these reinsurers. As such, funds, trust agreements and letters of credit are held to collateralize a portion of Alleghany’s reinsurance recoverables and Alleghany’s reinsurance and insurance subsidiaries reinsure portions of the risks they underwrite or assume with multiple reinsurance programs.

TransRe enters into retrocession arrangements, including property catastrophe retrocession arrangements, in order to reduce the effect of individual or aggregate exposure to losses, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns and increase gross premium writings and risk capacity without requiring additional capital.

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 and property per risk reinsurance program run on an annual basis from May 1 to the following April 30 and portions expired on April 30, 2018. Both programs were renewed on May 1, 2018 with substantially similar terms as the expired programs.

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Liability for Loss and LAE

6 Months Ended

Jun. 30, 2018

Liability for Loss and LAE

5. Liability for Loss and LAE

(a) Liability Rollforward

The following table presents the activity in the liability for loss and LAE in the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018			2017
	($ in millions)
Reserves as of January 1	$	11,871.3		$	11,087.2
Less: reinsurance recoverables(1)		1,650.1			1,236.2
Net reserves as of January 1		10,221.2			9,851.0
Other adjustments		2.0			-
Incurred loss and LAE, net of reinsurance, related to:
Current year		1,546.7			1,545.6
Prior years		(137.9	)		(111.4	)
Total incurred loss and LAE, net of reinsurance		1,408.8			1,434.2
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		237.6			242.7
Prior years		1,366.1			1,190.1
Total paid loss and LAE, net of reinsurance		1,603.7			1,432.8
Foreign currency exchange rate effect		(24.2	)		55.4
Net reserves as of June 30		10,004.1			9,907.8
Reinsurance recoverables as of June 30(1)		1,511.4			1,152.4
Reserves as of June 30	$	11,515.5		$	11,060.2

(1) Reinsurance recoverables in this table include only ceded loss and LAE reserves.

(2) Includes paid losses, net of reinsurance, related to commutations.

Gross loss and LAE reserves and reinsurance recoverables as of June 30, 2018 decreased from December 31, 2017, primarily reflecting payments on catastrophe losses incurred in 2017 and favorable prior accident year loss reserve development. The decrease in net loss and LAE reserves was partially offset by the collection of reinsurance recoverables related to catastrophe losses incurred in 2017.

(b) Liability Development

The following table presents the (favorable) unfavorable prior accident year loss reserve development for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	5.1(	1)	$	(4.0)	(2)	$	(25.3)	(3)	$	(4.4)	(2)
Non-catastrophe		(18.8)	(4)		(18.9)	(5)		(29.8)	(4)		(50.0)	(5)
Total property		(13.7)			(22.9)			(55.1)			(54.4)
Casualty & other:
Malpractice Treaties(6)		(3.4)			(2.0)			(3.4)			(2.0)
Ogden rate impact(7)		-			-			-			24.4
Other		(33.6)	(8)		(27.7)	(9)		(63.8)	(10)		(58.9)	(9)
Total casualty & other		(37.0)			(29.7)			(67.2)			(36.5)
Total Reinsurance Segment		(50.7)			(52.6)			(122.3)			(90.9)
Insurance Segment
RSUI:
Casualty		(1.5)	(11)		(9.5)	(12)		(12.5)	(13)		(21.6)	(12)
Property and other		0.1			(0.8)			-			2.9(	14)
Total RSUI		(1.4)			(10.3)			(12.5)			(18.7)
CapSpecialty		(0.1)			(0.2)	(15)		(3.1)	(16)		(0.8)	(15)
PacificComp		-			(0.5)	(17)		-			(1.0)	(17)
Total incurred related to prior years	$	(52.2)		$	(63.6)		$	(137.9)		$	(111.4)

(1) Primarily reflects unfavorable prior accident year loss reserve development related to Hurricane Maria that occurred in the 2017 accident year, partially offset by favorable prior accident year loss reserve development related to Hurricane Harvey that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

(2) Primarily reflects favorable prior accident year loss reserve development related to catastrophes that occurred in the 2010 through 2016 accident years.

(3) Primarily reflects favorable prior accident year loss reserve development related to Hurricanes Harvey and Maria that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

(4) Primarily reflects favorable prior accident year loss reserve development in the 2016 and 2017 accident years.

(5) Primarily reflects favorable prior accident year loss reserve development in the 2013 through 2016 accident years.

(6) Represents certain medical malpractice treaties pursuant to which the increased underwriting profits created by the favorable prior accident year loss reserve development are largely retained by the cedants. As a result, the favorable prior accident year loss reserve development is largely offset by an increase in profit commission expense incurred when such favorable prior accident year loss reserve development occurs.

(7) Represents unfavorable prior accident year loss reserve development related to the U.K. Ministry of Justice’s significant reduction in the discount rate, referred to as the Ogden rate, used to calculate lump-sum bodily injury payouts in personal injury insurance claims in the U.K to negative 0.75 percent as of March 20, 2017 from 2.50 percent.

(8) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2015 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

(9) Primarily reflects favorable prior accident year loss reserve development in the longer-tailed U.S. professional liability lines of business in the 2005 through 2014 accident years, partially offset by unfavorable development in the shorter-tailed casualty lines of business in the 2015 accident year in the U.S. and in the U.K.

(10) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2016 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

(11) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors’ and officers’ liability lines of business in the 2012 accident year.

(12) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2011 accident years.

(13) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors’ and officers’ liability lines of business in the 2009 and 2012 accident years.

(14) Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business in the 2015 and 2016 accident years.

(15) Primarily reflects favorable prior accident year loss reserve development in the casualty lines of business in the 2010 and 2015 accident years.

(16) Primarily reflects favorable prior accident year loss reserve development in the surety lines of business in the 2016 and 2017 accident years.

(17) Primarily reflects favorable prior accident year loss reserve development in the 2013 and prior accident years.

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Income Taxes

6 Months Ended

Jun. 30, 2018

Income Taxes

6. Income Taxes

The effective tax rate on earnings before income taxes for the first six months of 2018 was 19.1 percent, compared with 27.6 percent for the first six months of 2017. The decrease in the effective tax rate in the first six months of 2018 from the first six months of 2017 primarily reflects the decrease in the U.S. corporate federal income tax rate from 35.0 percent to 21.0 percent due to the Tax Act, partially offset by new limitations on certain deductions as a result of the Tax Act. There continues to be a degree of uncertainty as to how certain provisions of the Tax Act will be interpreted and implemented in practice in the future.

Alleghany believes that, as of June 30, 2018, it had no material uncertain tax positions. Interest and penalties related to unrecognized tax expenses (benefits) are recognized in income tax expense, when applicable. There were no material liabilities for interest or penalties accrued as of June 30, 2018.

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Stockholders' Equity

6 Months Ended

Jun. 30, 2018

Stockholders' Equity

7. Stockholders’ Equity

(a) Common Stock Repurchases

In November 2015, the Alleghany Board of Directors authorized the repurchase of shares of common stock of Alleghany, par value $1.00 per share (“Common Stock”), at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million (the “2015 Repurchase Program”). In June 2018, the Alleghany Board of Directors authorized, upon the completion of the 2015 Repurchase Program, the repurchase of additional shares of Common Stock, at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million. As of June 30, 2018, Alleghany had $527.1 million remaining under both share repurchase authorization programs.

The following table presents the shares of Common Stock that Alleghany repurchased in the three and six months ended June 30, 2018 and 2017 pursuant to the 2015 Repurchase Program:     

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Shares repurchased		368,551		-		403,623		-
Cost of shares repurchased (in millions)	$	214.8	$	-	$	236.1	$	-
Average price per share repurchased	$	582.92	$	-	$	584.96	$	-

(b) Accumulated Other Comprehensive Income (loss)

The following table presents a reconciliation of the changes during the six months ended June 30, 2018 and 2017 in accumulated other comprehensive income (loss) attributable to Alleghany stockholders:

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2018	$	718.2		$	(84.6	)		$      (15.5	)	$	618.1
Cumulative effect of adoption of new accounting pronouncements(1):
Reclassification of net unrealized gains on equity securities, net of tax		(735.6	)		-			-			(735.6	)
Reclassification of stranded taxes		156.6			(18.2	)		(3.3	)		135.1
Total		(579.0	)		(18.2	)		(3.3	)		(600.5	)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		(179.7	)		(5.4	)		(1.1	)		(186.2	)
Reclassifications from accumulated other comprehensive income		(3.7	)		-			-			(3.7	)
Total		(183.4	)		(5.4	)		(1.1	)		(189.9	)
Balance as of June 30, 2018	$	(44.2	)	$	(108.2	)	$	(19.9	)	$	(172.3	)
	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2017	$	232.2		$	(111.2	)	$	(11.7	)	$	109.3
Cumulative effect of adoption of new accounting pronouncements(1)		12.9			-			-			12.9
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		266.7			15.0			(0.3	)		281.4
Reclassifications from accumulated other comprehensive income		(40.3	)		-			-			(40.3	)
Total		226.4			15.0			(0.3	)		241.1
Balance as of June 30, 2017	$	471.5		$	(96.2	)	$	(12.0	)	$	363.3

(1) See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of new investment accounting guidance and new guidance on certain tax effects caused by the Tax Act.

The following table presents reclassifications out of accumulated other comprehensive income attributable to Alleghany stockholders during the three and six months ended June 30, 2018 and 2017:

Accumulated Other		Three Months Ended June 30,						Six Months Ended June 30,
Comprehensive Income Component	Line in Consolidated Statement of Earnings	2018			2017			2018			2017
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(6.5	)	$	(9.3	)	$	(5.3	)	$	(68.9	)
	Other than temporary impairment losses		-			3.8			0.5			7.0
	Income taxes		1.4			1.9			1.1			21.6
Total reclassifications:	Net earnings	$	(5.1	)	$	(3.6	)	$	(3.7	)	$	(40.3	)

(1) For the six month period ended June 30, 2018, excludes a $45.7 million pre-tax gain from AIHL’s conversion of its limited partnership interests in certain subsidiaries of Ares into Ares common units. See Note 3(h) of this Form 10-Q for additional information.

(c) Special Dividend

In February 2018, the Alleghany Board of Directors declared a special dividend of $10 per share for stockholders of record on March 5, 2018. On March 15, 2018, Alleghany paid dividends to stockholders totaling $154.0 million.

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Earnings Per Share of Common Stock

6 Months Ended

Jun. 30, 2018

Earnings Per Share of Common Stock

8. Earnings Per Share of Common Stock

The following table presents a reconciliation of the earnings and share data used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
	($ in millions, except share amounts)
Net earnings available to Alleghany stockholders	$	295.1	$	101.8	$	466.7	$	251.0
Effect of dilutive securities		-		-		-		-
Income available to common stockholders for diluted earnings per share	$	295.1	$	101.8	$	466.7	$	251.0
Weighted average common shares outstanding applicable to basic earnings per share		15,180,075		15,419,034		15,284,679		15,416,366
Effect of dilutive securities		-		-		4,915		5,703
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		15,180,075		15,419,034		15,289,594		15,422,069

57,766 and 75,035 contingently issuable shares were potentially available during the first six months of 2018 and 2017, respectively, but were not included in the diluted earnings per share computations because the impact was anti-dilutive to the earnings per share calculation.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies

9. Commitments and Contingencies

(a) Legal Proceedings

Certain of 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 are adequate, and management does not believe that any pending litigation will have a material adverse effect on Alleghany’s consolidated results of operations, financial position or cash flows.

(b) Leases

Alleghany and its subsidiaries lease certain facilities, furniture and equipment under long-term lease agreements. Additional information about leases can be found in Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

(c) Energy Holdings

As of June 30, 2018, Alleghany had holdings in energy sector businesses of $920.0 million, comprised of $289.6 million of debt securities, $487.1 million of equity securities and $143.3 million of Alleghany’s equity attributable to SORC.

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Segments of Business

6 Months Ended

Jun. 30, 2018

Segments of Business

10. Segments of Business

(a) Overview

Alleghany’s segments are reported in a manner consistent with the way management evaluates the business. As such, Alleghany classifies its business into three reportable segments – reinsurance, insurance and Alleghany Capital. Alleghany determined that Alleghany Capital qualified as a reportable segment in the first quarter of 2018, reflecting the increased significance of Alleghany Capital’s business to Alleghany and its projected growth.

Reinsurance and insurance underwriting activities are evaluated separately from investment and other activities. Segment accounting policies are described in Note 1 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

The reinsurance segment consists of property and casualty reinsurance operations conducted by TransRe’s reinsurance operating subsidiaries and is further reported through two major product lines – property and casualty & other. TransRe provides property and casualty reinsurance to insurers and reinsurers through brokers and on a direct basis to ceding companies. TransRe also writes a modest amount of insurance business, which is included in the reinsurance segment. A significant portion of the premiums earned by TransRe’s operations are generated by offices located in Canada, Europe, Asia, Australia, Africa and those serving Latin America and the Caribbean. Although the majority of the premiums earned by these offices typically relate to the regions where they are located, a significant portion may be derived from other regions of the world, including the U.S. In addition, although a significant portion of the assets and liabilities of these foreign offices generally relate to the countries where ceding companies and reinsurers are located, most investments are located in the country of domicile of these offices.

The insurance segment consists of property and casualty insurance operations conducted in the U.S. by AIHL through its insurance operating subsidiaries RSUI, CapSpecialty and, prior to its sale on December 31, 2017, PacificComp. RSUI also writes a modest amount of assumed reinsurance business, which is included in the insurance segment.

The Alleghany Capital segment consists of industrial operations, non-industrial operations and corporate operations at the Alleghany Capital level. Industrial operations are conducted through Bourn & Koch, Kentucky Trailer, W&W|AFCO Steel, beginning April 28, 2017 (the date on which Alleghany Capital acquired approximately 80 percent of the equity thereof), and a 45 percent equity interest in Wilbert, beginning August 1, 2017 (the date on which Alleghany Capital acquired a 45 percent equity interest therein). Non-industrial operations are conducted through IPS and Jazwares. On August 1, 2017, Alleghany Capital acquired a 45 percent equity interest in Wilbert.

On February 7, 2018, W&W|AFCO Steel acquired the outstanding equity of Hirschfeld, a fabricator of steel bridges and structural steel for stadiums, airports and other large commercial and industrial projects, for $111.3 million, consisting of $96.6 million in cash and $14.7 million of incremental debt. The acquisition-date consideration transferred and purchase price allocation to the acquired assets and assumed liabilities of Hirschfeld were based on estimated fair values that have not been finalized. As a result, the fair value recorded for these items is a provisional estimate and may be subject to adjustment. Once completed, any adjustment resulting from the valuations may impact the individual amounts recorded for acquired assets and assumed liabilities, as well as the residual goodwill. The acquisition accounting for Hirschfeld is expected to be finalized later in 2018.

Corporate activities are not classified as a segment. The primary components of corporate activities are Alleghany Properties, SORC and activities at the Alleghany parent company.

In addition, corporate activities include interest expense associated with the senior notes issued by Alleghany, whereas interest expense associated with senior notes issued by TransRe is included in “Total Segments” and interest expense associated with other debt is included in Alleghany Capital. Information related to the senior notes and other debt can be found in Note 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

(b) Results

The following tables present the results for Alleghany’s three reportable segments and for corporate activities for the three and six months ended June 30, 2018 and 2017:

	Reinsurance Segment						Insurance Segment
Three Months Ended June 30, 2018	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Total		Subtotal		Alleghany Capital			Total Segments		Corporate Activities(2)			Consolidated
	($ in millions)
Gross premiums written	$	345.1	$	726.6	$	1,071.7	$	318.8	$	88.7	$	407.5	$	1,479.2	$	-		$	1,479.2	$	(6.5	)	$	1,472.7
Net premiums written		275.9		700.7		976.6		216.9		82.3		299.2		1,275.8		-			1,275.8		-			1,275.8
Net premiums earned		292.1		689.2		981.3		184.7		71.0		255.7		1,237.0		-			1,237.0		-			1,237.0
Net loss and LAE		153.5		440.0		593.5		105.7		39.0		144.7		738.2		-			738.2		-			738.2
Commissions, brokerage and other underwriting expenses		94.8		223.2		318.0		53.7		30.4		84.1		402.1		-			402.1		-			402.1
Underwriting profit(3)	$	43.8	$	26.0	$	69.8	$	25.3	$	1.6	$	26.9		96.7		-			96.7		-			96.7
Net investment income														121.1		1.2			122.3		4.0			126.3
Change in the fair value of equity securities														146.8		-			146.8		38.4			185.2
Net realized capital gains														6.8		(0.1	)		6.7		(0.2	)		6.5
Other than temporary impairment losses														-		-			-		-			-
Noninsurance revenue														4.7		329.0			333.7		9.0			342.7
Other operating expenses														19.9		314.5			334.4		8.8			343.2
Corporate administration														0.8		-			0.8		13.3			14.1
Amortization of intangible assets														0.2		5.8			6.0		-			6.0
Interest expense														6.9		2.3			9.2		13.1			22.3
Earnings before income taxes													$	348.3	$	7.5		$	355.8	$	16.0		$	371.8

	Reinsurance Segment						Insurance Segment
Three Months Ended June 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Subtotal			Alleghany Capital			Total Segments			Corporate Activities(2)			Consolidated
													($ in millions)
Gross premiums written	$	369.1	$	676.3	$	1,045.4	$	295.1	$	73.3	$	41.9	$	410.3	$	1,455.7		$	-		$	1,455.7		$	(5.7	)	$	1,450.0
Net premiums written		317.2		661.6		978.8		204.6		68.4		41.3		314.3		1,293.1			-			1,293.1			-			1,293.1
Net premiums earned		270.5		686.9		957.4		178.5		64.1		43.9		286.5		1,243.9			-			1,243.9			-			1,243.9
Net loss and LAE		122.9		450.1		573.0		93.8		35.6		32.5		161.9		734.9			-			734.9			-			734.9
Commissions, brokerage and other underwriting expenses		87.9		234.3		322.2		53.0		27.2		11.3		91.5		413.7			-			413.7			-			413.7
Underwriting profit(3)	$	59.7	$	2.5	$	62.2	$	31.7	$	1.3	$	0.1	$	33.1		95.3			-			95.3			-			95.3
Net investment income																98.0			0.2			98.2			3.5			101.7
Change in the fair value of equity securities																-			-			-			-			-
Net realized capital gains																9.2			0.2			9.4			(0.1	)		9.3
Other than temporary impairment losses																(3.8	)		-			(3.8	)		-			(3.8	)
Noninsurance revenue																3.3			192.8			196.1			6.7			202.8
Other operating expenses																25.9			189.4			215.3			9.9			225.2
Corporate administration																0.8			-			0.8			13.6			14.4
Amortization of intangible assets																(0.4	)		5.0			4.6			-			4.6
Interest expense																6.8			1.0			7.8			13.2			21.0
Earnings (losses) before income taxes															$	168.9		$	(2.2	)	$	166.7		$	(26.6	)	$	140.1

	Reinsurance Segment						Insurance Segment
Six Months Ended June 30, 2018	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities(2)			Consolidated
											($ in millions)
Gross premiums written	$	742.3	$	1,445.0	$	2,187.3	$	593.4	$	163.2	$	756.6	$	2,943.9		$	-	$	2,943.9		$	(12.4	)	$	2,931.5
Net premiums written		581.0		1,392.7		1,973.7		403.8		151.7		555.5		2,529.2			-		2,529.2			-			2,529.2
Net premiums earned		567.2		1,374.3		1,941.5		365.6		137.7		503.3		2,444.8			-		2,444.8			-			2,444.8
Net loss and LAE		250.1		882.8		1,132.9		202.6		73.3		275.9		1,408.8			-		1,408.8			-			1,408.8
Commissions, brokerage and other underwriting expenses		187.9		452.1		640.0		107.2		61.2		168.4		808.4			-		808.4			-			808.4
Underwriting profit(3)	$	129.2	$	39.4	$	168.6	$	55.8	$	3.2	$	59.0		227.6			-		227.6			-			227.6
Net investment income														239.4			3.1		242.5			7.9			250.4
Change in the fair value of equity securities														132.7			-		132.7			9.9			142.6
Net realized capital gains														50.7			0.5		51.2			(0.2	)		51.0
Other than temporary impairment losses														(0.5	)		-		(0.5	)		-			(0.5	)
Noninsurance revenue														10.4			571.7		582.1			12.3			594.4
Other operating expenses														37.0			554.4		591.4			16.7			608.1
Corporate administration														0.5			-		0.5			21.4			21.9
Amortization of intangible assets														-			11.2		11.2			-			11.2
Interest expense														13.6			3.6		17.2			26.6			43.8
Earnings (losses) before income taxes													$	609.2		$	6.1	$	615.3		$	(34.8	)	$	580.5

	Reinsurance Segment							Insurance Segment
Six Months Ended June 30, 2017	Property		Casualty & Other(1)			Total		RSUI		Cap Specialty		Pacific Comp			Total		Subtotal			Alleghany Capital			Total Segments			Corporate Activities(2)			Consolidated
															($ in millions)
Gross premiums written	$	744.5	$	1,356.6		$	2,101.1	$	559.6	$	138.8	$	82.6		$	781.0	$	2,882.1		$	-		$	2,882.1		$	(11.2	)	$	2,870.9
Net premiums written		602.4		1,325.8			1,928.2		387.2		129.4		81.4			598.0		2,526.2			-			2,526.2			-			2,526.2
Net premiums earned		557.3		1,326.2			1,883.5		361.2		126.2		82.2			569.6		2,453.1			-			2,453.1			-			2,453.1
Net loss and LAE		244.7		885.4			1,130.1		174.4		68.7		61.0			304.1		1,434.2			-			1,434.2			-			1,434.2
Commissions, brokerage and other underwriting expenses		178.7		459.0			637.7		107.9		54.9		21.7			184.5		822.2			-			822.2			-			822.2
Underwriting profit (loss)(3)	$	133.9	$	(18.2	)	$	115.7	$	78.9	$	2.6	$	(0.5	)	$	81.0		196.7			-			196.7			-			196.7
Net investment income																		210.3			0.5			210.8			6.4			217.2
Change in the fair value of equity securities																		-			-			-			-			-
Net realized capital gains																		69.4			0.1			69.5			(0.6	)		68.9
Other than temporary impairment losses																		(7.0	)		-			(7.0	)		-			(7.0	)
Noninsurance revenue																		5.8			337.6			343.4			10.7			354.1
Other operating expenses																		49.1			331.0			380.1			20.2			400.3
Corporate administration																		1.6			-			1.6			29.7			31.3
Amortization of intangible assets																		(0.9	)		9.3			8.4			-			8.4
Interest expense																		13.6			1.8			15.4			26.5			41.9
Earnings (losses) before income taxes																	$	411.8		$	(3.9	)	$	407.9		$	(59.9	)	$	348.0

(1) Primarily consists of the following assumed reinsurance lines of business: directors’ and officers’ liability; errors and omissions liability; general liability; medical malpractice; ocean marine and aviation; auto liability; accident and health; surety; and credit.

(2) Includes elimination of minor reinsurance activity between segments.

(3) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, OTTI losses,

noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its reinsurance and insurance segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company’s ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.

(c) Identifiable Assets and Equity

The following table presents identifiable assets, the portion of identifiable assets related to cash and invested assets, and equity attributable to Alleghany, for Alleghany’s three reportable segments and for corporate activities as of June 30, 2018:

	Identifiable Assets		Invested Assets and Cash		Equity Attributable to Alleghany
	($ in millions)
Reinsurance segment	$	16,356.9	$	13,387.8	$	5,208.5
Insurance segment		6,837.9		5,263.3		2,891.5
Subtotal		23,194.8		18,651.1		8,100.0
Alleghany Capital		1,328.3		130.5		777.2
Total segments		24,523.1		18,781.6		8,877.2
Corporate activities		562.8		485.6		(472.8)
Consolidated	$	25,085.9	$	19,267.2	$	8,404.4

Included in Alleghany Capital is debt associated with its operating subsidiaries, which totaled $185.4 million as of June 30, 2018. The $185.4 million includes $95.0 million of borrowings by W&W|AFCO Steel under its available credit facility and term loans (including borrowings incurred and assumed from its acquisition of Hirschfeld), $41.0 million of borrowings by Jazwares under its available credit facility, $19.1 million of term loans at Kentucky Trailer primarily related to borrowings to finance small acquisitions and borrowings under its available credit facility, $15.7 million of borrowings by IPS under its available credit facility, and $14.6 million of term loans at Bourn & Koch related to borrowings to finance an acquisition and borrowings under its available credit facility. None of these liabilities are guaranteed by Alleghany or Alleghany Capital.

(d) Alleghany Capital Noninsurance Revenue

For Alleghany Capital’s industrial and non-industrial operations, noninsurance revenue consists of the sale of manufactured goods and services. The following table presents noninsurance revenue for the Alleghany Capital segment for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	($ in millions)
Industrial(1)	$	221.9	$	74.5	$	367.4	$	116.4
Non-industrial(2)		107.1		118.3		204.2		221.2
Corporate & other		-		-		0.1		-
Alleghany Capital	$	329.0	$	192.8	$	571.7	$	337.6

(1) For the three and six months ended June 30, 2018, the vast majority of noninsurance revenues were recognized as goods and services transferred to customers over time. For the three and six months ended June 30, 2017, approximately 66 percent and 57 percent, respectively, of noninsurance revenues were recognized as services were transferred to customers over time, with the remainder recognized as goods transferred at a point in time. See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of new revenue recognition accounting guidance effective in the first quarter of 2018.

(2) For the three and six months ended June 30, 2018, approximately 70 percent of noninsurance revenues were recognized as services transferred to customers over time, with the remainder recognized as goods transferred at a point in time. For the three and six months ended June 30, 2017, approximately 75 percent and 78 percent, respectively, of noninsurance revenues were recognized as services were transferred to customers over time, with the remainder recognized as goods were transferred at a point in time. See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of new revenue recognition accounting guidance effective in the first quarter of 2018.

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Summary of Significant Accounting Principles (Policies)

6 Months Ended

Jun. 30, 2018

Principles of Financial Statement Presentation

(a) Principles of Financial Statement Presentation

This Quarterly Report on Form 10-Q (this “Form 10-Q”) should be read in conjunction with the Annual Report on Form 10-K for the year ended December 31, 2017 (the “2017 Form 10-K”) and the Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 of Alleghany Corporation (“Alleghany”).

Alleghany Corporation, a Delaware corporation, owns and manages certain operating subsidiaries and investments, anchored by a core position in property and casualty reinsurance and insurance. Through its wholly-owned subsidiary Transatlantic Holdings, Inc. (“TransRe”), Alleghany is engaged in the property and casualty reinsurance business. TransRe has been a subsidiary of Alleghany since March 2012. Through its wholly-owned subsidiary Alleghany Insurance Holdings LLC (“AIHL”) and its subsidiaries, Alleghany is engaged in the property and casualty insurance business. AIHL’s insurance operations are principally conducted by its subsidiaries RSUI Group, Inc. (“RSUI”) and CapSpecialty, Inc. (“CapSpecialty”). RSUI has been a subsidiary of AIHL since July 2003 and CapSpecialty has been a subsidiary of AIHL since January 2002. AIHL Re LLC (“AIHL Re”), a captive reinsurance company which provides reinsurance to Alleghany’s current and former insurance operating subsidiaries and affiliates, has been a subsidiary of Alleghany since its formation in May 2006.

Prior to December 31, 2017, AIHL’s insurance operations also included Pacific Compensation Corporation (“PacificComp”). On September 12, 2017, AIHL signed a definitive agreement to sell PacificComp to CopperPoint Mutual Insurance Company (“CopperPoint”) for total cash consideration of approximately $158 million. The transaction closed on December 31, 2017, at which time: (i) approximately $442 million of PacificComp assets, consisting primarily of debt securities, and approximately $316 million of PacificComp liabilities, consisting primarily of loss and loss adjustment expenses (“LAE”) reserves, were transferred to CopperPoint; and (ii) AIHL recorded an after-tax gain of approximately $16 million, which included a tax benefit. In connection with the transaction, AIHL Re will continue to provide adverse development reinsurance coverage on PacificComp’s pre-acquisition claims, subject to certain terms and conditions. AIHL Re’s obligations, which are guaranteed by Alleghany, are subject to: (i) an aggregate limit of $150.0 million; and (ii) a final commutation and settlement as of December 31, 2024.

Although Alleghany’s primary sources of revenues and earnings are its reinsurance and insurance operations and investments, Alleghany also sources, executes, manages and monitors certain private investments primarily through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s investments include:

• Bourn & Koch, Inc. (“Bourn & Koch”), a manufacturer/remanufacturer of specialty machine tools and supplier of replacement parts, accessories and services for a variety of cutting technologies, headquartered in Rockford, Illinois;

• R.C. Tway Company, LLC (“Kentucky Trailer”), a manufacturer of custom trailers and truck bodies for the moving and storage industry and other markets, headquartered in Louisville, Kentucky;

• IPS-Integrated Project Services, LLC (“IPS”), a technical service provider focused on the global pharmaceutical and biotechnology industries, headquartered in Blue Bell, Pennsylvania;

• Jazwares, LLC (together with its affiliates, “Jazwares”), a global toy, entertainment and musical instrument company, headquartered in Sunrise, Florida;

• WWSC Holdings, LLC (“W&W|AFCO Steel”), a structural steel fabricator and erector, headquartered in Oklahoma City, Oklahoma; and

• a 45 percent equity interest in Wilbert Funeral Services, Inc. (“Wilbert”), a provider of products and services for the funeral and cemetery industries and precast concrete markets, headquartered in Overland Park, Kansas.

The results of W&W|AFCO Steel have been included in Alleghany’s consolidated results beginning with its acquisition by Alleghany Capital on April 28, 2017. On February 7, 2018, W&W|AFCO Steel acquired Hirschfeld Holdings, LP (“Hirschfeld”).

Wilbert is accounted for under the equity method of accounting and is included in other invested assets. The results of Wilbert have been included in Alleghany’s consolidated results beginning with its acquisition by Alleghany Capital on August 1, 2017.

In addition, Alleghany owns certain other holding-company investments. Alleghany’s wholly-owned subsidiary, Stranded Oil Resources Corporation (“SORC”) is an exploration and production company focused on enhanced oil recovery, headquartered in Golden, Colorado. Alleghany’s wholly-owned subsidiary, Alleghany Properties Holdings LLC (“Alleghany Properties”), owns and manages certain properties in the Sacramento, California region. Alleghany’s public equity investments are managed primarily through Alleghany’s wholly-owned subsidiary Roundwood Asset Management LLC.

Unless the context otherwise requires, references to “Alleghany” include Alleghany together with its subsidiaries.

The accompanying 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 U.S. (“GAAP”). All material inter-company balances and transactions have been eliminated in consolidation.

The portion of stockholders’ equity, net earnings and comprehensive income that is not attributable to Alleghany stockholders is presented on the Consolidated Balance Sheets and the Consolidated Statements of Earnings and Comprehensive Income as noncontrolling interests. Because all noncontrolling interests have the option to sell their ownership interests to Alleghany in the future (generally through 2024), the portion of stockholders’ equity that is not attributable to Alleghany stockholders is presented on the Consolidated Balance Sheets as redeemable noncontrolling interests for all periods presented. During the first six months of 2018, the noncontrolling interests outstanding were approximately as follows: Bourn & Koch - 11 percent; Kentucky Trailer - 21 percent; IPS - 16 percent; Jazwares - 23 percent; and W&W|AFCO Steel - 20 percent.

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 as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Alleghany relies on historical experience and on various other assumptions that it believes to be reasonable under the circumstances to make judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from those reported results to the extent that those estimates and assumptions prove to be inaccurate. Changes in estimates are reflected in the Consolidated Statements of Earnings and Comprehensive Income in the period in which the changes are made.

(b) Other Significant Accounting Principles

Alleghany’s significant accounting principles can be found in Note 1 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K.

Recent Accounting Standards

(c) Recent Accounting Standards

Recently Adopted

In February 2018, the Financial Accounting Standards Board (the “FASB”) issued guidance on certain tax effects caused by the Tax Cuts and Jobs Act of 2017 (the “Tax Act”), which was signed into law on December 22, 2017. The Tax Act, among other things, reduced the U.S. corporate federal income tax rate from 35.0 percent to 21.0 percent, effective January 1, 2018 for the 2018 tax year. Under such circumstances, GAAP requires that the value of deferred tax assets and liabilities be reduced through tax expense. The new guidance provides an option to reclassify any stranded tax amounts that remain in accumulated other comprehensive income to retained earnings, either retrospectively or at the beginning of the period in which the adoption is elected. This guidance became effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany adopted this new guidance in the first quarter of 2018 and has elected to reclassify stranded tax amounts that remain in accumulated other comprehensive income, in the amount of approximately $135 million, to retained earnings as of January 1, 2018. See Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income, and see Note 9 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the Tax Act and its impact on Alleghany.

In March 2017, the FASB issued guidance that reduces the amortization period for the premium on certain purchased callable debt securities to the earliest call date. The guidance applies specifically to noncontingent call features that are callable at a predetermined and fixed price and date. The accounting for purchased callable debt securities held at a discount is not affected. This guidance is effective in the first quarter of 2019 for public entities with early adoption permitted. Alleghany adopted this guidance in the fourth quarter of 2017 and recorded a cumulative effect reduction of approximately $13 million directly to opening 2017 retained earnings and an offsetting increase in opening 2017 accumulated other comprehensive income. The implementation did not have a material impact on Alleghany’s results of operations and financial condition. See Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income.

In May 2014, the FASB, together with the International Accounting Standards Board, issued guidance on the recognition of revenue from contracts with customers. Under this guidance, revenue is recognized as the transfer of goods and services to customers takes place and in amounts that reflect the payment or payments that are expected to be received from the customers for those goods and services. This guidance also requires new disclosures about revenue. Revenues related to insurance and reinsurance contracts and revenues from investments are not impacted by this guidance, whereas noninsurance revenues arising from the sale of manufactured goods and services is generally included within the scope of this guidance. This guidance, and all related amendments, became effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany adopted this guidance in the first quarter of 2018 using the modified retrospective transition approach and the implementation did not have a material impact on its results of operations and financial condition. See Note 10 of this Form 10-Q for further information on Alleghany’s noninsurance revenues.

In January 2016, the FASB issued guidance that changes the recognition and measurement of certain financial instruments. This guidance requires investments in equity securities (except those accounted for under the equity method of accounting, but including partnership investments not accounted for under the equity method) to be measured at fair value with changes in fair value recognized in net earnings. For equity securities that do not have readily determinable fair values, measurement may be at cost, adjusted for any impairment and changes resulting from observable price changes for a similar investment of the same issuer. This guidance also changes the presentation and disclosure of financial instruments by: (i) requiring that financial instrument disclosures of fair value use the exit price notion; (ii) requiring separate presentation of financial assets and financial liabilities by measurement category and form, either on the balance sheet or the accompanying notes to the financial statements; (iii) requiring separate presentation in other comprehensive income for the portion of the change in a liability’s fair value resulting from instrument-specific credit risk when an election has been made to measure the liability at fair value; and (iv) eliminating the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost on the balance sheet. This guidance is effective for fiscal years beginning after December 15, 2017 for public entities, including interim periods within those fiscal years. Except for the change in presentation for instrument-specific credit risk, this guidance does not permit early adoption. Alleghany adopted this guidance in the first quarter of 2018. As of January 1, 2018, approximately $736 million of net unrealized gains of equity securities, net of deferred taxes, were reclassified from accumulated other comprehensive income to retained earnings. Subsequently, all changes in unrealized gains or losses of equity securities, net of deferred taxes, were presented in the Consolidated Statements of Earnings rather than the Consolidated Statements of Comprehensive Income, under the caption “change in the fair value of equity securities.” Results arising from partnership investments, whether accounted for under the equity method or at fair value, continue to be reported as a component of net investment income. The implementation did not have a material impact on Alleghany’s financial condition. See Note 3 of this Form 10-Q for further information on Alleghany’s equity securities, and Note 7(b) of this Form 10-Q for further information on accumulated other comprehensive income.

Future Application of Accounting Standards

In February 2016, the FASB issued guidance on leases. Under this guidance, a lessee is required to recognize lease liabilities and corresponding right-of-use assets for leases with terms of more than one year, whereas under current guidance, a lessee is only required to recognize assets and liabilities for those leases qualifying as capital leases. This guidance also requires new disclosures about the amount, timing and uncertainty of cash flows arising from leases. The accounting by lessors is to remain largely unchanged. This guidance is effective in the first quarter of 2019 for public entities, with early adoption permitted. A modified retrospective transition approach is required for all leases in existence as of, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Alleghany will adopt this guidance in the first quarter of 2019 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition. See Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for further information on Alleghany’s leases.

In June 2016, the FASB issued guidance on credit losses. Under this guidance, a company is required to measure all expected credit losses on loans, reinsurance recoverables and other financial assets accounted for at cost or amortized cost, as applicable. Estimates of expected credit losses are to be based on historical experience, current conditions and reasonable and supportable forecasts. Credit losses for securities accounted for on an available-for-sale (“AFS”) basis are to be measured in a manner similar to GAAP as currently applied and cannot exceed the amount by which the fair value is less than the amortized cost. Credit losses for all financial assets are to be recorded through an allowance for credit losses. Subsequent reversals in credit loss estimates are permitted and are to be recognized in earnings. This guidance also requires new disclosures about the significant estimates and judgments used in estimating credit losses, as well as the credit quality of financial assets. This guidance is effective in the first quarter of 2020 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2020 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

In January 2017, the FASB issued guidance that simplifies the subsequent measurement of goodwill. Under this guidance, if an initial qualitative assessment indicates that the fair value of an operating subsidiary may be less than its carrying amount, an impairment charge is recognized for the amount by which the carrying amount of the operating subsidiary exceeds its estimated fair value. Any resulting impairment loss recognized cannot exceed the total amount of goodwill associated with the operating subsidiary. This guidance is effective in the first quarter of 2020 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2020 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition. See Note 2 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for further information on Alleghany’s goodwill.

In August 2017, the FASB issued guidance that simplifies the requirements to achieve hedge accounting, better reflects the economic results of hedging in the financial statements and improves the alignment between hedge accounting and a company’s risk management activities. This guidance is effective in the first quarter of 2019 for public entities, with early adoption permitted. Alleghany will adopt this guidance in the first quarter of 2019 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Carrying Value and Estimated Fair Value of Consolidated Financial Instruments

The following table presents the carrying value and estimated fair value of Alleghany’s consolidated financial instruments as of June 30, 2018 and December 31, 2017:

	June 30, 2018				December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	17,401.1	$	17,401.1	$	17,406.5	$	17,406.5
Liabilities
Senior Notes and other debt(2)	$	1,569.4	$	1,697.6	$	1,484.9	$	1,614.6

(1) This table includes debt and equity securities, as well as partnership and non-marketable equity investments carried at fair value that are included in other invested assets. This table excludes investments accounted for using the equity method and commercial mortgage loans that are carried at unpaid principal balance. 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 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2017 Form 10-K for additional information on the senior notes and other debt.

Financial Instruments Measured at Fair Value and Level of Fair Value Hierarchy of Inputs

The following tables present Alleghany’s financial instruments measured at fair value and the level of the fair value hierarchy of inputs used as of June 30, 2018 and December 31, 2017:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of June 30, 2018
Equity securities:
Common stock	$	4,704.2	$	3.6	$	-	$	4,707.8
Preferred stock		-		-		6.3		6.3
Total equity securities		4,704.2		3.6		6.3		4,714.1
Debt securities:
U.S. Government obligations		-		993.6		-		993.6
Municipal bonds		-		2,842.5		-		2,842.5
Foreign government obligations		-		932.9		-		932.9
U.S. corporate bonds		-		2,040.6		367.8		2,408.4
Foreign corporate bonds		-		1,317.6		94.8		1,412.4
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		-		1,160.7		-		1,160.7
Commercial mortgage-backed securities (“CMBS”)		-		540.6		-		540.6
Other asset-backed securities(2)		-		640.8		1,224.0		1,864.8
Total debt securities		-		10,469.3		1,686.6		12,155.9
Short-term investments		-		472.8		-		472.8
Other invested assets(3)		-		-		58.3		58.3
Total investments (excluding equity method investments and loans)	$	4,704.2	$	10,945.7	$	1,751.2	$	17,401.1
Senior Notes and other debt	$	-	$	1,512.2	$	185.4	$	1,697.6

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	4,090.7	$	3.8	$	-	$	4,094.5
Preferred stock		-		3.1		1.9		5.0
Total equity securities		4,090.7		6.9		1.9		4,099.5
Debt securities:
U.S. Government obligations		-		948.0		-		948.0
Municipal bonds		-		3,682.1		-		3,682.1
Foreign government obligations		-		1,006.6		-		1,006.6
U.S. corporate bonds		-		2,173.0		260.0		2,433.0
Foreign corporate bonds		-		1,424.6		75.2		1,499.8
Mortgage and asset-backed securities:
RMBS(1)		-		833.8		161.8		995.6
CMBS		-		550.1		1.6		551.7
Other asset-backed securities(2)		-		503.3		1,101.3		1,604.6
Total debt securities		-		11,121.5		1,599.9		12,721.4
Short-term investments		-		578.1		-		578.1
Other invested assets(3)		-		-		7.5		7.5
Total investments (excluding equity method investments and loans)	$	4,090.7	$	11,706.5	$	1,609.3	$	17,406.5
Senior Notes and other debt	$	-	$	1,513.6	$	101.0	$	1,614.6

(1) Primarily includes government agency pass-through securities guaranteed by a government agency or government sponsored enterprise, among other types of RMBS.

(2) Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

(3) Includes partnership and non-marketable equity investments accounted for at fair value, and excludes investments accounted for using the equity method.

Reconciliations of Changes in Level Three Assets Measured at Fair Value

The following tables present reconciliations of the changes during the six months ended June 30, 2018 and 2017 in Level 3 assets measured at fair value:

							Debt Securities
													Mortgage and asset-backed
Six Months Ended June 30, 2018				Preferred   Stock			U.S.   Corporate   Bonds			Foreign   Corporate   Bonds			RMBS			CMBS			Other Asset- backed     Securities			Other       Invested       Assets(1)			Total
				($ in millions)
Balance as of January 1, 2018				$	1.9		$	260.0		$	75.2		$	161.8		$	1.6		$	1,101.3		$	7.5		$	1,609.3
Net realized/unrealized gains (losses) included in:
Net earnings(2)					-			-			(0.1	)		(0.3	)		-			1.0			1.1			1.7
Other comprehensive income					0.2			(6.9	)		(2.2	)		(5.3	)		-			(7.7	)		(3.5	)		(25.4	)
Purchases					-			117.3			23.8			-			-			495.1			-			636.2
Sales					(0.1	)		(2.5	)		(1.9	)		(5.6	)		-			(365.7	)		(5.6	)		(381.4	)
Issuances					-			-			-			-			-			-			-			-
Settlements					-			-			-			-			-			-			-			-
Transfers into Level 3					4.3			1.2			-			-			-			-			58.8			64.3
Transfers out of Level 3					-			(1.3	)		-			(150.6	)		(1.6	)		-			-			(153.5	)
Balance as of June 30, 2018				$	6.3		$	367.8		$	94.8		$	-		$	-		$	1,224.0		$	58.3		$	1,751.2
	Equity Securities						Debt Securities
													Mortgage and asset-backed
Six Months Ended June 30, 2017	Common   Stock			Preferred   Stock			U.S.   Corporate   Bonds			Foreign   Corporate   Bonds			RMBS			CMBS			Other Asset- backed     Securities			Other       Invested       Assets(1)			Total
													($ in millions)
Balance as of January 1, 2017	$	4.3		$	-		$	72.9		$	0.4		$	5.9		$	4.3		$	903.8		$	28.1		$	1,019.7
Net realized/unrealized gains (losses) included in:
Net earnings(2)		(0.1	)		-			(0.3	)		-			0.1			-			2.7			10.8			13.2
Other comprehensive income		0.5			-			1.5			0.4			0.2			0.1			11.9			(10.6	)		4.0
Purchases		-			2.4			151.4			36.0			-			-			578.0			-			767.8
Sales		(1.8	)		(0.2	)		(4.3	)		(0.1	)		-			(2.2	)		(19.7	)		(21.6	)		(49.9	)
Issuances		-			-			-			-			-			-			-			-			-
Settlements		-			-			(4.4	)		-			(0.7	)		(0.3	)		(315.8	)		-			(321.2	)
Transfers into Level 3		1.4			-			3.0			0.3			-			-			-			-			4.7
Transfers out of Level 3		(2.4	)		-			(4.8	)		-			-			-			-			-			(7.2	)
Balance as of June 30, 2017	$	1.9		$	2.2		$	215.0		$	37.0		$	5.5		$	1.9		$	1,160.9		$	6.7		$	1,431.1

(1) Includes partnership and non-marketable equity investments accounted for at fair value.

(2) There were no other than temporary impairment (“OTTI”) losses recorded in net earnings related to Level 3 assets still held as of June 30, 2018 and 2017.

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Investments (Tables)

6 Months Ended

Jun. 30, 2018

Amortized Cost or Cost and Fair Value of Available For Sale Securities

The following tables present the amortized cost or cost and the fair value of AFS securities as of June 30, 2018 and December 31, 2017:

	Amortized Cost or Cost		Gross   Unrealized   Gains		Gross   Unrealized   Losses		Fair Value
	($ in millions)
As of June 30, 2018
Debt securities:
U.S. Government obligations	$	1,026.0	$	0.6	$	(33.0)	$	993.6
Municipal bonds		2,803.5		56.1		(17.1)		2,842.5
Foreign government obligations		929.3		9.3		(5.7)		932.9
U.S. corporate bonds		2,432.4		17.9		(41.9)		2,408.4
Foreign corporate bonds		1,418.5		12.9		(19.0)		1,412.4
Mortgage and asset-backed securities:
RMBS		1,184.1		3.3		(26.7)		1,160.7
CMBS		545.5		2.5		(7.4)		540.6
Other asset-backed securities(1)		1,866.7		4.9		(6.8)		1,864.8
Total debt securities		12,206.0		107.5		(157.6)		12,155.9
Short-term investments		472.8		-		-		472.8
Total investments	$	12,678.8	$	107.5	$	(157.6)	$	12,628.7
	Amortized Cost or Cost		Gross   Unrealized   Gains		Gross   Unrealized   Losses		Fair Value
			($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	3,165.8	$	932.5	$	(3.8)	$	4,094.5
Preferred stock		4.9		0.1		-		5.0
Total equity securities		3,170.7		932.6		(3.8)		4,099.5
Debt securities:
U.S. Government obligations		963.9		1.7		(17.6)		948.0
Municipal bonds		3,578.9		109.8		(6.6)		3,682.1
Foreign government obligations		1,000.1		11.2		(4.7)		1,006.6
U.S. corporate bonds		2,381.1		61.6		(9.7)		2,433.0
Foreign corporate bonds		1,481.8		24.5		(6.5)		1,499.8
Mortgage and asset-backed securities:
RMBS		993.9		6.3		(4.6)		995.6
CMBS		545.0		9.0		(2.3)		551.7
Other asset-backed securities(1)		1,592.1		13.8		(1.3)		1,604.6
Total debt securities		12,536.8		237.9		(53.3)		12,721.4
Short-term investments		578.1		-		-		578.1
Total investments	$	16,285.6	$	1,170.5	$	(57.1)	$	17,399.0

(1) Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

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

The following table presents the amortized cost or cost and estimated fair value of debt securities by contractual maturity as of June 30, 2018. 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 or Cost		Fair Value
	($ in millions)
As of June 30, 2018
Short-term investments due in one year or less	$	472.8	$	472.8
Mortgage and asset-backed securities(1)		3,596.3		3,566.1
Debt securities with maturity dates:
One year or less		348.2		348.2
Over one through five years		3,042.6		3,024.8
Over five through ten years		2,997.0		2,973.6
Over ten years		2,221.9		2,243.2
Total debt securities	$	12,206.0	$	12,155.9

(1) Mortgage and asset-backed securities by their nature do not generally have single maturity dates.

Net Investment Income

The following table presents net investment income for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
	($ in millions)
Interest income	$	104.8		$	102.5		$	206.8		$	201.7
Dividend income		22.3			11.8			38.6			21.2
Investment expenses		(6.6	)		(6.9	)		(18.6	)		(14.3	)
Pillar Investments(1)		1.9			3.2			1.9			6.6
Limited partnership interests in certain subsidiaries of Ares(1)		(0.7	)		(12.6	)		13.2			(7.4	)
Other investment results		4.6			3.7			8.5			9.4
Total	$	126.3		$	101.7		$	250.4		$	217.2

(1) See Note 3(h) of this Form 10-Q for discussion of the Pillar Investments, as defined therein, and limited partnership interests in certain subsidiaries of Ares.

Summary of Increases in Fair Value of Equity Securities

The following table presents increases in the fair value of equity securities for the three and six months ended June 30, 2018:

	Three Months Ended		Six Months Ended
	June 30, 2018		June 30, 2018
	($ in millions)
Change in the fair value of equity securities sold during the period	$	4.4	$	16.0
Change in the fair value of equity securities held at the end of the period		180.8		126.6
Change in the fair value of equity securities	$	185.2	$	142.6

Amounts of Gross Realized Capital Gains and Gross Realized Capital Losses of Available For Sale Securities

The following table presents amounts of gross realized capital gains and gross realized capital losses for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	($ in millions)
Gross realized capital gains	$	6.5	$	34.0	$	66.4	$	142.7
Gross realized capital losses		-		(24.7)		(15.4)		(73.8)
Net realized capital gains	$	6.5	$	9.3	$	51.0	$	68.9

Gross Unrealized Losses and Related Fair Values for AFS Securities Grouped by Duration of Time in Continuous Unrealized Loss Position

The following tables present gross unrealized losses and related fair values for Alleghany’s AFS securities, grouped by duration of time in a continuous unrealized loss position, as of June 30, 2018 and December 31, 2017:

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	($ in millions)
As of June 30, 2018
Debt securities:
U.S. Government obligations	$	532.8	$	12.7	$	390.1	$	20.3	$	922.9	$	33.0
Municipal bonds		543.2		8.2		215.2		8.9		758.4		17.1
Foreign government obligations		189.9		2.1		130.5		3.6		320.4		5.7
U.S. corporate bonds		1,355.7		32.1		174.1		9.8		1,529.8		41.9
Foreign corporate bonds		656.7		12.7		189.2		6.3		845.9		19.0
Mortgage and asset-backed securities:
RMBS		887.3		21.3		116.5		5.4		1,003.8		26.7
CMBS		277.9		4.6		32.3		2.8		310.2		7.4
Other asset-backed securities		982.2		6.4		27.7		0.4		1,009.9		6.8
Total temporarily impaired securities	$	5,425.7	$	100.1	$	1,275.6	$	57.5	$	6,701.3	$	157.6

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	($ in millions)
As of December 31, 2017
Equity securities:
Common stock	$	145.7	$	3.8	$	-	$	-	$	145.7	$	3.8
Preferred stock		-		-		-		-		-		-
Total equity securities		145.7		3.8		-		-		145.7		3.8
Debt securities:
U.S. Government obligations		447.8		4.4		416.6		13.2		864.4		17.6
Municipal bonds		240.0		1.5		267.3		5.1		507.3		6.6
Foreign government obligations		321.9		2.7		72.2		2.0		394.1		4.7
U.S. corporate bonds		568.8		6.1		207.3		3.6		776.1		9.7
Foreign corporate bonds		417.4		3.0		159.4		3.5		576.8		6.5
Mortgage and asset-backed securities:
RMBS		284.2		1.6		131.5		3.0		415.7		4.6
CMBS		112.2		0.5		34.7		1.8		146.9		2.3
Other asset-backed securities		211.1		0.9		65.7		0.4		276.8		1.3
Total debt securities		2,603.4		20.7		1,354.7		32.6		3,958.1		53.3
Total temporarily impaired securities	$	2,749.1	$	24.5	$	1,354.7	$	32.6	$	4,103.8	$	57.1

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Liability for Loss and LAE (Tables)

6 Months Ended

Jun. 30, 2018

Activity in Liability for Loss and Loss Adjustment Expense

The following table presents the activity in the liability for loss and LAE in the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018			2017
	($ in millions)
Reserves as of January 1	$	11,871.3		$	11,087.2
Less: reinsurance recoverables(1)		1,650.1			1,236.2
Net reserves as of January 1		10,221.2			9,851.0
Other adjustments		2.0			-
Incurred loss and LAE, net of reinsurance, related to:
Current year		1,546.7			1,545.6
Prior years		(137.9	)		(111.4	)
Total incurred loss and LAE, net of reinsurance		1,408.8			1,434.2
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		237.6			242.7
Prior years		1,366.1			1,190.1
Total paid loss and LAE, net of reinsurance		1,603.7			1,432.8
Foreign currency exchange rate effect		(24.2	)		55.4
Net reserves as of June 30		10,004.1			9,907.8
Reinsurance recoverables as of June 30(1)		1,511.4			1,152.4
Reserves as of June 30	$	11,515.5		$	11,060.2

(1) Reinsurance recoverables in this table include only ceded loss and LAE reserves.

(2) Includes paid losses, net of reinsurance, related to commutations.

(Favorable) Unfavorable Prior Accident Year Loss Reserve Development

The following table presents the (favorable) unfavorable prior accident year loss reserve development for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	5.1(	1)	$	(4.0)	(2)	$	(25.3)	(3)	$	(4.4)	(2)
Non-catastrophe		(18.8)	(4)		(18.9)	(5)		(29.8)	(4)		(50.0)	(5)
Total property		(13.7)			(22.9)			(55.1)			(54.4)
Casualty & other:
Malpractice Treaties(6)		(3.4)			(2.0)			(3.4)			(2.0)
Ogden rate impact(7)		-			-			-			24.4
Other		(33.6)	(8)		(27.7)	(9)		(63.8)	(10)		(58.9)	(9)
Total casualty & other		(37.0)			(29.7)			(67.2)			(36.5)
Total Reinsurance Segment		(50.7)			(52.6)			(122.3)			(90.9)
Insurance Segment
RSUI:
Casualty		(1.5)	(11)		(9.5)	(12)		(12.5)	(13)		(21.6)	(12)
Property and other		0.1			(0.8)			-			2.9(	14)
Total RSUI		(1.4)			(10.3)			(12.5)			(18.7)
CapSpecialty		(0.1)			(0.2)	(15)		(3.1)	(16)		(0.8)	(15)
PacificComp		-			(0.5)	(17)		-			(1.0)	(17)
Total incurred related to prior years	$	(52.2)		$	(63.6)		$	(137.9)		$	(111.4)

(1) Primarily reflects unfavorable prior accident year loss reserve development related to Hurricane Maria that occurred in the 2017 accident year, partially offset by favorable prior accident year loss reserve development related to Hurricane Harvey that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

(2) Primarily reflects favorable prior accident year loss reserve development related to catastrophes that occurred in the 2010 through 2016 accident years.

(3) Primarily reflects favorable prior accident year loss reserve development related to Hurricanes Harvey and Maria that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

(4) Primarily reflects favorable prior accident year loss reserve development in the 2016 and 2017 accident years.

(5) Primarily reflects favorable prior accident year loss reserve development in the 2013 through 2016 accident years.

(6) Represents certain medical malpractice treaties pursuant to which the increased underwriting profits created by the favorable prior accident year loss reserve development are largely retained by the cedants. As a result, the favorable prior accident year loss reserve development is largely offset by an increase in profit commission expense incurred when such favorable prior accident year loss reserve development occurs.

(7) Represents unfavorable prior accident year loss reserve development related to the U.K. Ministry of Justice’s significant reduction in the discount rate, referred to as the Ogden rate, used to calculate lump-sum bodily injury payouts in personal injury insurance claims in the U.K to negative 0.75 percent as of March 20, 2017 from 2.50 percent.

(8) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2015 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

(9) Primarily reflects favorable prior accident year loss reserve development in the longer-tailed U.S. professional liability lines of business in the 2005 through 2014 accident years, partially offset by unfavorable development in the shorter-tailed casualty lines of business in the 2015 accident year in the U.S. and in the U.K.

(10) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2016 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

(11) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors’ and officers’ liability lines of business in the 2012 accident year.

(12) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2011 accident years.

(13) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors’ and officers’ liability lines of business in the 2009 and 2012 accident years.

(14) Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business in the 2015 and 2016 accident years.

(15) Primarily reflects favorable prior accident year loss reserve development in the casualty lines of business in the 2010 and 2015 accident years.

(16) Primarily reflects favorable prior accident year loss reserve development in the surety lines of business in the 2016 and 2017 accident years.

(17) Primarily reflects favorable prior accident year loss reserve development in the 2013 and prior accident years.

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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Common Stock Repurchases

The following table presents the shares of Common Stock that Alleghany repurchased in the three and six months ended June 30, 2018 and 2017 pursuant to the 2015 Repurchase Program:     

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Shares repurchased		368,551		-		403,623		-
Cost of shares repurchased (in millions)	$	214.8	$	-	$	236.1	$	-
Average price per share repurchased	$	582.92	$	-	$	584.96	$	-

Reconciliation of Accumulated Other Comprehensive Income (Loss)

The following table presents a reconciliation of the changes during the six months ended June 30, 2018 and 2017 in accumulated other comprehensive income (loss) attributable to Alleghany stockholders:

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2018	$	718.2		$	(84.6	)		$      (15.5	)	$	618.1
Cumulative effect of adoption of new accounting pronouncements(1):
Reclassification of net unrealized gains on equity securities, net of tax		(735.6	)		-			-			(735.6	)
Reclassification of stranded taxes		156.6			(18.2	)		(3.3	)		135.1
Total		(579.0	)		(18.2	)		(3.3	)		(600.5	)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		(179.7	)		(5.4	)		(1.1	)		(186.2	)
Reclassifications from accumulated other comprehensive income		(3.7	)		-			-			(3.7	)
Total		(183.4	)		(5.4	)		(1.1	)		(189.9	)
Balance as of June 30, 2018	$	(44.2	)	$	(108.2	)	$	(19.9	)	$	(172.3	)
	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2017	$	232.2		$	(111.2	)	$	(11.7	)	$	109.3
Cumulative effect of adoption of new accounting pronouncements(1)		12.9			-			-			12.9
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		266.7			15.0			(0.3	)		281.4
Reclassifications from accumulated other comprehensive income		(40.3	)		-			-			(40.3	)
Total		226.4			15.0			(0.3	)		241.1
Balance as of June 30, 2017	$	471.5		$	(96.2	)	$	(12.0	)	$	363.3

(1) See Note 1(c) of this Form 10-Q for additional information regarding Alleghany’s adoption of new investment accounting guidance and new guidance on certain tax effects caused by the Tax Act.

Reclassifications of Accumulated Other Comprehensive Income

The following table presents reclassifications out of accumulated other comprehensive income attributable to Alleghany stockholders during the three and six months ended June 30, 2018 and 2017:

Accumulated Other		Three Months Ended June 30,						Six Months Ended June 30,
Comprehensive Income Component	Line in Consolidated Statement of Earnings	2018			2017			2018			2017
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(6.5	)	$	(9.3	)	$	(5.3	)	$	(68.9	)
	Other than temporary impairment losses		-			3.8			0.5			7.0
	Income taxes		1.4			1.9			1.1			21.6
Total reclassifications:	Net earnings	$	(5.1	)	$	(3.6	)	$	(3.7	)	$	(40.3	)

(1) For the six month period ended June 30, 2018, excludes a $45.7 million pre-tax gain from AIHL’s conversion of its limited partnership interests in certain subsidiaries of Ares into Ares common units. See Note 3(h) of this Form 10-Q for additional information.

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Earnings Per Share of Common Stock (Tables)

6 Months Ended

Jun. 30, 2018

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

The following table presents a reconciliation of the earnings and share data used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
	($ in millions, except share amounts)
Net earnings available to Alleghany stockholders	$	295.1	$	101.8	$	466.7	$	251.0
Effect of dilutive securities		-		-		-		-
Income available to common stockholders for diluted earnings per share	$	295.1	$	101.8	$	466.7	$	251.0
Weighted average common shares outstanding applicable to basic earnings per share		15,180,075		15,419,034		15,284,679		15,416,366
Effect of dilutive securities		-		-		4,915		5,703
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		15,180,075		15,419,034		15,289,594		15,422,069

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Segments of Business (Tables)

6 Months Ended

Jun. 30, 2018

Results for Reportable Segments and Corporate Activities

The following tables present the results for Alleghany’s three reportable segments and for corporate activities for the three and six months ended June 30, 2018 and 2017:

	Reinsurance Segment						Insurance Segment
Three Months Ended June 30, 2018	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Total		Subtotal		Alleghany Capital			Total Segments		Corporate Activities(2)			Consolidated
	($ in millions)
Gross premiums written	$	345.1	$	726.6	$	1,071.7	$	318.8	$	88.7	$	407.5	$	1,479.2	$	-		$	1,479.2	$	(6.5	)	$	1,472.7
Net premiums written		275.9		700.7		976.6		216.9		82.3		299.2		1,275.8		-			1,275.8		-			1,275.8
Net premiums earned		292.1		689.2		981.3		184.7		71.0		255.7		1,237.0		-			1,237.0		-			1,237.0
Net loss and LAE		153.5		440.0		593.5		105.7		39.0		144.7		738.2		-			738.2		-			738.2
Commissions, brokerage and other underwriting expenses		94.8		223.2		318.0		53.7		30.4		84.1		402.1		-			402.1		-			402.1
Underwriting profit(3)	$	43.8	$	26.0	$	69.8	$	25.3	$	1.6	$	26.9		96.7		-			96.7		-			96.7
Net investment income														121.1		1.2			122.3		4.0			126.3
Change in the fair value of equity securities														146.8		-			146.8		38.4			185.2
Net realized capital gains														6.8		(0.1	)		6.7		(0.2	)		6.5
Other than temporary impairment losses														-		-			-		-			-
Noninsurance revenue														4.7		329.0			333.7		9.0			342.7
Other operating expenses														19.9		314.5			334.4		8.8			343.2
Corporate administration														0.8		-			0.8		13.3			14.1
Amortization of intangible assets														0.2		5.8			6.0		-			6.0
Interest expense														6.9		2.3			9.2		13.1			22.3
Earnings before income taxes													$	348.3	$	7.5		$	355.8	$	16.0		$	371.8

	Reinsurance Segment						Insurance Segment
Three Months Ended June 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Subtotal			Alleghany Capital			Total Segments			Corporate Activities(2)			Consolidated
													($ in millions)
Gross premiums written	$	369.1	$	676.3	$	1,045.4	$	295.1	$	73.3	$	41.9	$	410.3	$	1,455.7		$	-		$	1,455.7		$	(5.7	)	$	1,450.0
Net premiums written		317.2		661.6		978.8		204.6		68.4		41.3		314.3		1,293.1			-			1,293.1			-			1,293.1
Net premiums earned		270.5		686.9		957.4		178.5		64.1		43.9		286.5		1,243.9			-			1,243.9			-			1,243.9
Net loss and LAE		122.9		450.1		573.0		93.8		35.6		32.5		161.9		734.9			-			734.9			-			734.9
Commissions, brokerage and other underwriting expenses		87.9		234.3		322.2		53.0		27.2		11.3		91.5		413.7			-			413.7			-			413.7
Underwriting profit(3)	$	59.7	$	2.5	$	62.2	$	31.7	$	1.3	$	0.1	$	33.1		95.3			-			95.3			-			95.3
Net investment income																98.0			0.2			98.2			3.5			101.7
Change in the fair value of equity securities																-			-			-			-			-
Net realized capital gains																9.2			0.2			9.4			(0.1	)		9.3
Other than temporary impairment losses																(3.8	)		-			(3.8	)		-			(3.8	)
Noninsurance revenue																3.3			192.8			196.1			6.7			202.8
Other operating expenses																25.9			189.4			215.3			9.9			225.2
Corporate administration																0.8			-			0.8			13.6			14.4
Amortization of intangible assets																(0.4	)		5.0			4.6			-			4.6
Interest expense																6.8			1.0			7.8			13.2			21.0
Earnings (losses) before income taxes															$	168.9		$	(2.2	)	$	166.7		$	(26.6	)	$	140.1

	Reinsurance Segment						Insurance Segment
Six Months Ended June 30, 2018	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities(2)			Consolidated
											($ in millions)
Gross premiums written	$	742.3	$	1,445.0	$	2,187.3	$	593.4	$	163.2	$	756.6	$	2,943.9		$	-	$	2,943.9		$	(12.4	)	$	2,931.5
Net premiums written		581.0		1,392.7		1,973.7		403.8		151.7		555.5		2,529.2			-		2,529.2			-			2,529.2
Net premiums earned		567.2		1,374.3		1,941.5		365.6		137.7		503.3		2,444.8			-		2,444.8			-			2,444.8
Net loss and LAE		250.1		882.8		1,132.9		202.6		73.3		275.9		1,408.8			-		1,408.8			-			1,408.8
Commissions, brokerage and other underwriting expenses		187.9		452.1		640.0		107.2		61.2		168.4		808.4			-		808.4			-			808.4
Underwriting profit(3)	$	129.2	$	39.4	$	168.6	$	55.8	$	3.2	$	59.0		227.6			-		227.6			-			227.6
Net investment income														239.4			3.1		242.5			7.9			250.4
Change in the fair value of equity securities														132.7			-		132.7			9.9			142.6
Net realized capital gains														50.7			0.5		51.2			(0.2	)		51.0
Other than temporary impairment losses														(0.5	)		-		(0.5	)		-			(0.5	)
Noninsurance revenue														10.4			571.7		582.1			12.3			594.4
Other operating expenses														37.0			554.4		591.4			16.7			608.1
Corporate administration														0.5			-		0.5			21.4			21.9
Amortization of intangible assets														-			11.2		11.2			-			11.2
Interest expense														13.6			3.6		17.2			26.6			43.8
Earnings (losses) before income taxes													$	609.2		$	6.1	$	615.3		$	(34.8	)	$	580.5

	Reinsurance Segment							Insurance Segment
Six Months Ended June 30, 2017	Property		Casualty & Other(1)			Total		RSUI		Cap Specialty		Pacific Comp			Total		Subtotal			Alleghany Capital			Total Segments			Corporate Activities(2)			Consolidated
															($ in millions)
Gross premiums written	$	744.5	$	1,356.6		$	2,101.1	$	559.6	$	138.8	$	82.6		$	781.0	$	2,882.1		$	-		$	2,882.1		$	(11.2	)	$	2,870.9
Net premiums written		602.4		1,325.8			1,928.2		387.2		129.4		81.4			598.0		2,526.2			-			2,526.2			-			2,526.2
Net premiums earned		557.3		1,326.2			1,883.5		361.2		126.2		82.2			569.6		2,453.1			-			2,453.1			-			2,453.1
Net loss and LAE		244.7		885.4			1,130.1		174.4		68.7		61.0			304.1		1,434.2			-			1,434.2			-			1,434.2
Commissions, brokerage and other underwriting expenses		178.7		459.0			637.7		107.9		54.9		21.7			184.5		822.2			-			822.2			-			822.2
Underwriting profit (loss)(3)	$	133.9	$	(18.2	)	$	115.7	$	78.9	$	2.6	$	(0.5	)	$	81.0		196.7			-			196.7			-			196.7
Net investment income																		210.3			0.5			210.8			6.4			217.2
Change in the fair value of equity securities																		-			-			-			-			-
Net realized capital gains																		69.4			0.1			69.5			(0.6	)		68.9
Other than temporary impairment losses																		(7.0	)		-			(7.0	)		-			(7.0	)
Noninsurance revenue																		5.8			337.6			343.4			10.7			354.1
Other operating expenses																		49.1			331.0			380.1			20.2			400.3
Corporate administration																		1.6			-			1.6			29.7			31.3
Amortization of intangible assets																		(0.9	)		9.3			8.4			-			8.4
Interest expense																		13.6			1.8			15.4			26.5			41.9
Earnings (losses) before income taxes																	$	411.8		$	(3.9	)	$	407.9		$	(59.9	)	$	348.0

(1) Primarily consists of the following assumed reinsurance lines of business: directors’ and officers’ liability; errors and omissions liability; general liability; medical malpractice; ocean marine and aviation; auto liability; accident and health; surety; and credit.

(2) Includes elimination of minor reinsurance activity between segments.

(3) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, OTTI losses,

noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its reinsurance and insurance segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company’s ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.

Summary of Identifiable Assets and Equity

The following table presents identifiable assets, the portion of identifiable assets related to cash and invested assets, and equity attributable to Alleghany, for Alleghany’s three reportable segments and for corporate activities as of June 30, 2018:

	Identifiable Assets		Invested Assets and Cash		Equity Attributable to Alleghany
	($ in millions)
Reinsurance segment	$	16,356.9	$	13,387.8	$	5,208.5
Insurance segment		6,837.9		5,263.3		2,891.5
Subtotal		23,194.8		18,651.1		8,100.0
Alleghany Capital		1,328.3		130.5		777.2
Total segments		24,523.1		18,781.6		8,877.2
Corporate activities		562.8		485.6		(472.8)
Consolidated	$	25,085.9	$	19,267.2	$	8,404.4

Summary of Alleghany Capital Noninsurance Revenue

The following table presents noninsurance revenue for the Alleghany Capital segment for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	($ in millions)
Industrial(1)	$	221.9	$	74.5	$	367.4	$	116.4
Non-industrial(2)		107.1		118.3		204.2		221.2
Corporate & other		-		-		0.1		-
Alleghany Capital	$	329.0	$	192.8	$	571.7	$	337.6

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Summary of Significant Accounting Principles - Additional Information (Detail) - USD ($) $ in Millions		6 Months Ended		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jan. 01, 2018	Aug. 01, 2017	Jan. 01, 2017
Significant Accounting Policies [Line Items]
Statutory federal income tax rate		21.00%	35.00%	35.00%
Accumulated Other Comprehensive Income
Significant Accounting Policies [Line Items]
Cumulative effective of adoption of new accounting pronouncements	[1]				$ (600.5)		$ 12.9
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income
Significant Accounting Policies [Line Items]
Cumulative effective of adoption of new accounting pronouncements	[1]				135.1
Accounting Standards Update 2018-02 | Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative effective of adoption of new accounting pronouncements					(135.1)
Accounting Standards Update 2017-08 | Accumulated Other Comprehensive Income
Significant Accounting Policies [Line Items]
Cumulative effective of adoption of new accounting pronouncements							13.0
Accounting Standards Update 2017-08 | Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative effective of adoption of new accounting pronouncements							$ (13.0)
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income
Significant Accounting Policies [Line Items]
Cumulative effective of adoption of new accounting pronouncements	[1]				(735.6)
Accounting Standards Update 2016-01 | Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative effective of adoption of new accounting pronouncements					$ 735.6
Wilbert Funeral Services, Inc
Significant Accounting Policies [Line Items]
Equity interest percentage		45.00%				45.00%
Pacific Comp
Significant Accounting Policies [Line Items]
Cash consideration from sale				$ 158.0
Disposal date				Dec. 31, 2017
Assets disposed of				$ 442.0
Liabilities disposed of				316.0
Gain on sale of business, after tax				16.0
Alleghany Corporation | Financial Guarantee | AIHL Re Limited Liability Company reinsurance of Pacific Compensation Insurance Company
Significant Accounting Policies [Line Items]
Guaranteed obligation, aggregate limit				150.0
Aihl Re Limited Liability Company | AIHL Re Limited Liability Company reinsurance of Pacific Compensation Insurance Company
Significant Accounting Policies [Line Items]
Aggregate limit				$ 150.0
Final commutation and settlement date				Dec. 31, 2024
WWSC Holdings, LLC
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners		20.00%
Kentucky Trailer
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners		21.00%
Integrated Project Services LLC
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners		16.00%
Bourn & Koch, Inc.
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners		11.00%
Jazwares, LLC
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners		23.00%
WWSC Holdings, LLC
Significant Accounting Policies [Line Items]
Business acquisition date		Apr. 28, 2017
Hirschfeld Holdings, LP | WWSC Holdings, LLC
Significant Accounting Policies [Line Items]
Business acquisition date		Feb. 07, 2018

[1] See Note 1(c) of this Form 10-Q for additional information regarding Alleghany's adoption of new investment accounting guidance and new guidance on certain tax effects caused by the Tax Act.

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Carrying Value and Estimated Fair Value of Consolidated Financial Instruments (Detail) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Assets
Investments (excluding equity method investments and loans)	[1]	$ 17,401.1	$ 17,406.5
Liabilities
Senior Notes and other debt	[2]	1,697.6	1,614.6
Carrying Value
Assets
Investments (excluding equity method investments and loans)	[1]	17,401.1	17,406.5
Liabilities
Senior Notes and other debt	[2]	$ 1,569.4	$ 1,484.9

[1] This table includes debt and equity securities, as well as partnership and non-marketable equity investments carried at fair value that are included in other invested assets. This table excludes investments accounted for using the equity method and commercial mortgage loans that are carried at unpaid principal balance. 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 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, "Financial Statements and Supplementary Data" of the 2017 Form 10-K for additional information on the senior notes and other debt.

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Financial Instruments Measured at Fair Value and Level of Fair Value Hierarchy of Inputs (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		$ 4,714,079
Estimated fair value of available for sale debt securities		12,155,866	$ 12,721,399
Estimated fair value of investments (excluding equity method investments and loans)	[1]	17,401,100	17,406,500
Senior Notes and other debt	[2]	1,697,600	1,614,600
Estimated fair value of equities			4,099,467
Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		4,707,800
Estimated fair value of equities			4,094,500
Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		6,300
Estimated fair value of equities			5,000
U.S. Government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		993,600	948,000
Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		2,842,500	3,682,100
Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		932,900	1,006,600
U.S. corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		2,408,400	2,433,000
Foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		1,412,400	1,499,800
RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[3]	1,160,700	995,600
CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		540,600	551,700
Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[4]	1,864,800	1,604,600
Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of investments (excluding equity method investments and loans)		472,800	578,100
Other invested assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of investments (excluding equity method investments and loans)	[5]	58,300	7,500
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		4,704,200
Estimated fair value of investments (excluding equity method investments and loans)		4,704,200	4,090,700
Estimated fair value of equities			4,090,700
Level 1 | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		4,704,200
Estimated fair value of equities			4,090,700
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		3,600
Estimated fair value of available for sale debt securities		10,469,300	11,121,500
Estimated fair value of investments (excluding equity method investments and loans)		10,945,700	11,706,500
Senior Notes and other debt		1,512,200	1,513,600
Estimated fair value of equities			6,900
Level 2 | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		3,600
Estimated fair value of equities			3,800
Level 2 | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities			3,100
Level 2 | U.S. Government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		993,600	948,000
Level 2 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		2,842,500	3,682,100
Level 2 | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		932,900	1,006,600
Level 2 | U.S. corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		2,040,600	2,173,000
Level 2 | Foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		1,317,600	1,424,600
Level 2 | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[3]	1,160,700	833,800
Level 2 | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		540,600	550,100
Level 2 | Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[4]	640,800	503,300
Level 2 | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of investments (excluding equity method investments and loans)		472,800	578,100
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		6,300
Estimated fair value of available for sale debt securities		1,686,600	1,599,900
Estimated fair value of investments (excluding equity method investments and loans)		1,751,200	1,609,300
Senior Notes and other debt		185,400	101,000
Estimated fair value of equities			1,900
Level 3 | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		6,300
Estimated fair value of equities			1,900
Level 3 | U.S. corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		367,800	260,000
Level 3 | Foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		94,800	75,200
Level 3 | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[3]		161,800
Level 3 | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities			1,600
Level 3 | Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[4]	1,224,000	1,101,300
Level 3 | Other invested assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of investments (excluding equity method investments and loans)	[5]	$ 58,300	$ 7,500

[1] This table includes debt and equity securities, as well as partnership and non-marketable equity investments carried at fair value that are included in other invested assets. This table excludes investments accounted for using the equity method and commercial mortgage loans that are carried at unpaid principal balance. 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 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, "Financial Statements and Supplementary Data" of the 2017 Form 10-K for additional information on the senior notes and other debt.

[3] Primarily includes government agency pass-through securities guaranteed by a government agency or government sponsored enterprise, among other types of RMBS.

[4] Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

[5] Includes partnership and non-marketable equity investments accounted for at fair value, and excludes investments accounted for using the equity method.

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Financial Instruments Measured at Fair Value and Level of Fair Value Hierarchy of Inputs (Parenthetical) (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		$ 12,155,866	$ 12,721,399
Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[1]	1,864,800	1,604,600
Collateralized loan obligations | Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		$ 1,224,000	$ 1,101,300

[1] Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended			6 Months Ended
		Mar. 15, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3			$ 151.9		$ 3.1	$ 153.5	$ 7.2
Gross transfers into Level 3					$ 2.1	64.3	4.7
All investment issuers other than Ares
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers into Level 3			1.3			5.6
CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3				$ 1.6		1.6
U.S. corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3			1.3			1.3	4.8
Gross transfers into Level 3						1.2	3.0
Foreign corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers into Level 3							0.3
Common Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3							2.4
Gross transfers into Level 3							$ 1.4
Common Stock | Ares | Insurance Segment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers into Level 1		$ 208.2
Preferred Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers into Level 3						4.3
Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers into Level 3	[1]					58.8
Other invested assets | Limited partnership interests in certain subsidiaries of Ares | Insurance Segment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers into Level 3		$ 58.7
Other invested assets | All investment issuers other than Ares
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers into Level 3						0.1
RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3			$ 150.6			$ 150.6

[1] Includes partnership and non-marketable equity investments accounted for at fair value.

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Reconciliations of Changes in Level Three Assets Measured at Fair Value (Detail) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			$ 1,609.3		$ 1,609.3	$ 1,019.7
Net realized/unrealized gains (losses) included in:
Net earnings	[1]				1.7	13.2
Other comprehensive income					(25.4)	4.0
Purchases					636.2	767.8
Sales					(381.4)	(49.9)
Issuances					0.0	0.0
Settlements						(321.2)
Transfers into Level 3				$ 2.1	64.3	4.7
Transfers out of Level 3		$ (151.9)		(3.1)	(153.5)	(7.2)
Ending balance		1,751.2		1,431.1	1,751.2	1,431.1
Preferred Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			1.9		1.9
Net realized/unrealized gains (losses) included in:
Other comprehensive income					0.2
Purchases						2.4
Sales					(0.1)	(0.2)
Issuances					0.0	0.0
Transfers into Level 3					4.3
Ending balance		6.3		2.2	6.3	2.2
Common Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance						4.3
Net realized/unrealized gains (losses) included in:
Net earnings	[1]					(0.1)
Other comprehensive income						0.5
Sales						(1.8)
Issuances						0.0
Transfers into Level 3						1.4
Transfers out of Level 3						(2.4)
Ending balance				1.9		1.9
U.S. corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			260.0		260.0	72.9
Net realized/unrealized gains (losses) included in:
Net earnings	[1]					(0.3)
Other comprehensive income					(6.9)	1.5
Purchases					117.3	151.4
Sales					(2.5)	(4.3)
Issuances					0.0	0.0
Settlements						(4.4)
Transfers into Level 3					1.2	3.0
Transfers out of Level 3		(1.3)			(1.3)	(4.8)
Ending balance		367.8		215.0	367.8	215.0
Foreign corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			75.2		75.2	0.4
Net realized/unrealized gains (losses) included in:
Net earnings	[1]				(0.1)
Other comprehensive income					(2.2)	0.4
Purchases					23.8	36.0
Sales					(1.9)	(0.1)
Issuances					0.0	0.0
Transfers into Level 3						0.3
Ending balance		94.8		37.0	94.8	37.0
RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			161.8		161.8	5.9
Net realized/unrealized gains (losses) included in:
Net earnings	[1]				(0.3)	0.1
Other comprehensive income					(5.3)	0.2
Sales					(5.6)
Issuances					0.0	0.0
Settlements						(0.7)
Transfers out of Level 3		(150.6)			(150.6)
Ending balance				5.5		5.5
CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			1.6		1.6	4.3
Net realized/unrealized gains (losses) included in:
Other comprehensive income						0.1
Sales						(2.2)
Issuances					0.0	0.0
Settlements						(0.3)
Transfers out of Level 3			(1.6)		(1.6)
Ending balance				1.9		1.9
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			1,101.3		1,101.3	903.8
Net realized/unrealized gains (losses) included in:
Net earnings	[1]				1.0	2.7
Other comprehensive income					(7.7)	11.9
Purchases					495.1	578.0
Sales					(365.7)	(19.7)
Issuances					0.0	0.0
Settlements						(315.8)
Ending balance		1,224.0		1,160.9	1,224.0	1,160.9
Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	[2]		$ 7.5		7.5	28.1
Net realized/unrealized gains (losses) included in:
Net earnings	[1],[2]				1.1	10.8
Other comprehensive income	[2]				(3.5)	(10.6)
Sales	[2]				(5.6)	(21.6)
Issuances	[2]				0.0	0.0
Transfers into Level 3	[2]				58.8
Ending balance	[2]	$ 58.3		$ 6.7	$ 58.3	$ 6.7

[1] There were no other than temporary impairment ("OTTI") losses recorded in net earnings related to Level 3 assets still held as of June 30, 2018 and 2017.

[2] Includes partnership and non-marketable equity investments accounted for at fair value.

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Amortized Cost or Cost and Fair Value of Available For Sale Securities (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Available-for-sale [Line Items]
Amortized Cost or Cost		$ 12,678,800	$ 16,285,600
Gross Unrealized Gains		107,500	1,170,500
Gross Unrealized Losses		(157,600)	(57,100)
Fair Value		12,628,700	17,399,000
Equity securities, cost			3,170,673
Equity securities, gross unrealized gains			932,600
Equity securities, gross unrealized losses			(3,800)
Equity securities, fair value			4,099,467
Debt securities, amortized cost		12,206,035	12,536,772
Debt securities, gross unrealized gains		107,500	237,900
Debt securities, gross unrealized losses		(157,600)	(53,300)
Debt securities, fair value		12,155,866	12,721,399
U.S. Government obligations
Available-for-sale [Line Items]
Debt securities, amortized cost		1,026,000	963,900
Debt securities, gross unrealized gains		600	1,700
Debt securities, gross unrealized losses		(33,000)	(17,600)
Debt securities, fair value		993,600	948,000
Municipal bonds
Available-for-sale [Line Items]
Debt securities, amortized cost		2,803,500	3,578,900
Debt securities, gross unrealized gains		56,100	109,800
Debt securities, gross unrealized losses		(17,100)	(6,600)
Debt securities, fair value		2,842,500	3,682,100
Foreign government obligations
Available-for-sale [Line Items]
Debt securities, amortized cost		929,300	1,000,100
Debt securities, gross unrealized gains		9,300	11,200
Debt securities, gross unrealized losses		(5,700)	(4,700)
Debt securities, fair value		932,900	1,006,600
U.S. corporate bonds
Available-for-sale [Line Items]
Debt securities, amortized cost		2,432,400	2,381,100
Debt securities, gross unrealized gains		17,900	61,600
Debt securities, gross unrealized losses		(41,900)	(9,700)
Debt securities, fair value		2,408,400	2,433,000
Foreign corporate bonds
Available-for-sale [Line Items]
Debt securities, amortized cost		1,418,500	1,481,800
Debt securities, gross unrealized gains		12,900	24,500
Debt securities, gross unrealized losses		(19,000)	(6,500)
Debt securities, fair value		1,412,400	1,499,800
RMBS
Available-for-sale [Line Items]
Debt securities, amortized cost		1,184,100	993,900
Debt securities, gross unrealized gains		3,300	6,300
Debt securities, gross unrealized losses		(26,700)	(4,600)
Debt securities, fair value	[1]	1,160,700	995,600
CMBS
Available-for-sale [Line Items]
Debt securities, amortized cost		545,500	545,000
Debt securities, gross unrealized gains		2,500	9,000
Debt securities, gross unrealized losses		(7,400)	(2,300)
Debt securities, fair value		540,600	551,700
Other asset-backed securities
Available-for-sale [Line Items]
Debt securities, amortized cost	[2]	1,866,700	1,592,100
Debt securities, gross unrealized gains	[2]	4,900	13,800
Debt securities, gross unrealized losses	[2]	(6,800)	(1,300)
Debt securities, fair value	[2]	1,864,800	1,604,600
Common Stock
Available-for-sale [Line Items]
Equity securities, cost			3,165,800
Equity securities, gross unrealized gains			932,500
Equity securities, gross unrealized losses			(3,800)
Equity securities, fair value			4,094,500
Preferred Stock
Available-for-sale [Line Items]
Equity securities, cost			4,900
Equity securities, gross unrealized gains			100
Equity securities, fair value			5,000
Short-term Investments
Available-for-sale [Line Items]
Amortized Cost or Cost		472,800	578,100
Fair Value		$ 472,800	$ 578,100

[1] Primarily includes government agency pass-through securities guaranteed by a government agency or government sponsored enterprise, among other types of RMBS.

[2] Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

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Amortized Cost or Cost and Fair Value of Available For Sale Securities (Parenthetical) (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Available-for-sale [Line Items]
Estimated fair value of available for sale debt securities		$ 12,155,866	$ 12,721,399
Other asset-backed securities
Available-for-sale [Line Items]
Estimated fair value of available for sale debt securities	[1]	1,864,800	1,604,600
Collateralized loan obligations | Other asset-backed securities
Available-for-sale [Line Items]
Estimated fair value of available for sale debt securities		$ 1,224,000	$ 1,101,300

[1] Includes $1,224.0 million and $1,101.3 million of collateralized loan obligations as of June 30, 2018 and December 31, 2017, respectively.

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Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Available-for-sale [Line Items]
Short-term investments due in one year or less, amortized cost or cost		$ 472,800
Mortgage and asset-backed securities, amortized cost or cost	[1]	3,596,300
Debt securities with maturity dates, amortized cost or cost:
One year or less		348,200
Over one through five years		3,042,600
Over five through ten years		2,997,000
Over ten years		2,221,900
Debt securities, amortized cost		12,206,035	$ 12,536,772
Short-term investments due in one year or less, fair value		472,830	578,054
Mortgage and asset-backed securities, fair value	[1]	3,566,100
Debt securities with maturity dates, fair value:
One year or less		348,200
Over one through five years		3,024,800
Over five through ten years		2,973,600
Over ten years		2,243,200
Debt securities, fair value		$ 12,155,866	$ 12,721,399

[1] Mortgage and asset-backed securities by their nature do not generally have single maturity dates.

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Net Investment Income (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Investment Income [Line Items]
Interest income		$ 104,800	$ 102,500	$ 206,800	$ 201,700
Dividend income		22,300	11,800	38,600	21,200
Investment expenses		(6,600)	(6,900)	(18,600)	(14,300)
Other investment results		4,600	3,700	8,500	9,400
Net investment income		126,273	101,656	250,399	217,194
Limited partnership interests in certain subsidiaries of Ares
Net Investment Income [Line Items]
Equity results	[1]	(700)	(12,600)	13,200	(7,400)
Pillar Capital Holdings Limited And Managed Funds
Net Investment Income [Line Items]
Equity results	[1]	$ 1,900	$ 3,200	$ 1,900	$ 6,600

[1] See Note 3(h) of this Form 10-Q for discussion of the Pillar Investments, as defined therein, and limited partnership interests in certain subsidiaries of Ares.

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Investments - Summary of Increases in Fair Value of Equity Securities (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Change in the fair value of equity securities sold during the period	$ 4.4	$ 16.0
Change in the fair value of equity securities held at the end of the period	180.8	126.6
Change in the fair value of equity securities	$ 185.2	$ 142.6

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Investments - Additional Information (Detail)		1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 15, 2018 USD ($)	Jul. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2018 USD ($) Investment	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Investment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Investment [Line Items]
Proceeds from sales of debt and equity securities				$ 800,000,000	$ 1,500,000,000	$ 1,900,000,000	$ 4,200,000,000
Net realized capital gains				$ 6,462,000	9,268,000	$ 50,967,000	68,919,000
Securities impairment test description						Debt securities in an unrealized loss position are evaluated for OTTI if they meet any of the following criteria: (i) they are trading at a discount of at least 20 percent to amortized cost for an extended period of time (nine consecutive months or more); (ii) there has been a negative credit or news event with respect to the issuer that could indicate the existence of an OTTI; or (iii) Alleghany intends to sell, or it is more likely than not that Alleghany will sell, the debt security before recovery of its amortized cost basis.If Alleghany intends to sell, or it is more likely than not that Alleghany will sell, a debt security before recovery of its amortized cost basis, the total amount of the unrealized loss position is recognized as an OTTI loss in earnings. To the extent that a debt security that is in an unrealized loss position is not impaired based on the preceding, Alleghany will consider a debt security to be impaired when it believes it to be probable that Alleghany will not be able to collect the entire amortized cost basis. For debt securities in an unrealized loss position as of the end of each quarter, Alleghany develops a best estimate of the present value of expected cash flows. If the results of the cash flow analysis indicate that Alleghany will not recover the full amount of its amortized cost basis in the debt security, Alleghany records an OTTI loss in earnings equal to the difference between the present value of expected cash flows and the amortized cost basis of the debt security. If applicable, the difference between the total unrealized loss position on the debt security and the OTTI loss recognized in earnings is the non-credit related portion, which is recorded as a component of other comprehensive income.In developing the cash flow analyses for debt securities, Alleghany considers various factors for the different categories of debt securities. For municipal bonds, Alleghany takes into account the taxing power of the issuer, source of revenue, credit risk and enhancements and pre-refunding. For mortgage and asset-backed securities, Alleghany discounts its best estimate of future cash flows at an effective rate equal to the original effective yield of the security or, in the case of floating rate securities, at the current coupon. Alleghany’s models include assumptions about prepayment speeds, default and delinquency rates, underlying collateral (if any), credit ratings, credit enhancements and other observable market data. For corporate bonds, Alleghany reviews business prospects, credit ratings and available information from asset managers and rating agencies for individual securities.
Other than temporary impairment losses						$ 511,000
Other than temporary impairment losses					3,747,000		6,964,000
Percentage of debt securities owned with credit rating below investment grade or not rated				4.30%		4.30%		5.30%
Other invested assets				$ 605,477,000		$ 605,477,000		$ 743,358,000
Fair value of common units				4,714,079,000		4,714,079,000
Fair value of investment				12,628,700,000		12,628,700,000		17,399,000,000
Net investment income				126,273,000	$ 101,656,000	250,399,000	217,194,000
Pillar Capital Holdings Limited And Managed Funds
Investment [Line Items]
Other invested assets				219,800,000		219,800,000
Pillar Capital Holdings Limited And Managed Funds | Reinsurance Segment
Investment [Line Items]
Investment in other invested asset			$ 175,000,000
Pillar Capital Holdings Limited And Managed Funds | Insurance Segment
Investment [Line Items]
Investment in other invested asset			$ 25,000,000
Limited partnership interests in certain subsidiaries of Ares | Insurance Segment
Investment [Line Items]
Net investment income	$ 12,900,000
Ares
Investment [Line Items]
Net realized capital gains						45,700,000
Ares | Insurance Segment
Investment [Line Items]
Net realized capital gains	45,700,000					45,700,000
Investment in other invested asset		$ 250,000,000
Percentage of equity stake		6.25%
Commercial Mortgage Loan Portfolio
Investment [Line Items]
Commercial mortgage loans				695,772,000		695,772,000		$ 658,364,000
Allowance for loan losses on commercial mortgage loans				0		0
Equity Securities
Investment [Line Items]
Other than temporary impairment losses							6,800,000
Debt Securities
Investment [Line Items]
Other than temporary impairment losses				$ 0		$ 500,000
Other than temporary impairment losses							$ 200,000
Number of securities in an unrealized loss position | Investment				1,995		1,995
Number of securities in an unrealized loss position for 12 months or more | Investment				430		430
Other invested assets | Limited partnership interests in certain subsidiaries of Ares | Insurance Segment
Investment [Line Items]
Fair value of investment	58,700,000
Common Stock
Investment [Line Items]
Fair value of common units				$ 4,707,800,000		$ 4,707,800,000
Common Stock | Ares | Insurance Segment
Investment [Line Items]
Fair value of common units	$ 208,200,000
Minimum | Commercial Mortgage Loan Portfolio
Investment [Line Items]
Term of commercial mortgage loans						2 years
Minimum | Debt Securities
Investment [Line Items]
Percentage of unrealized loss to cost where a security would be evaluated for other than temporarily impairment						20.00%
Maximum | Ares | Insurance Segment
Investment [Line Items]
Investment commitment in investment fund		$ 1,000,000,000
Maximum | Commercial Mortgage Loan Portfolio
Investment [Line Items]
Term of commercial mortgage loans						10 years
Percentage of principal amounts of loans to the property's appraised value						0.667%

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Amounts of Gross Realized Capital Gains and Gross Realized Capital Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Gross Gains (Losses) [Line Items]
Gross realized capital gains	$ 6,500	$ 34,000	$ 66,400	$ 142,700
Gross realized capital losses		(24,700)	(15,400)	(73,800)
Net realized capital gains	$ 6,462	$ 9,268	$ 50,967	$ 68,919

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Gross Unrealized Losses and Related Fair Values for AFS Securities Grouped by Duration of Time in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	$ 5,425.7
Securities, less than 12 months, gross unrealized losses	100.1
Securities, 12 months or more, fair value	1,275.6
Securities, 12 months or more, gross unrealized losses	57.5
Total, fair value	6,701.3
Total, gross unrealized losses	157.6
Securities, less than 12 months, fair value		$ 2,749.1
Securities, less than 12 months, gross unrealized losses		24.5
Securities, 12 months or more, fair value		1,354.7
Securities, 12 months or more, gross unrealized losses		32.6
Total, fair value		4,103.8
Total, gross unrealized losses		57.1
U.S. Government obligations
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	532.8
Securities, less than 12 months, gross unrealized losses	12.7
Securities, 12 months or more, fair value	390.1
Securities, 12 months or more, gross unrealized losses	20.3
Total, fair value	922.9
Total, gross unrealized losses	33.0
Securities, less than 12 months, fair value		447.8
Securities, less than 12 months, gross unrealized losses		4.4
Securities, 12 months or more, fair value		416.6
Securities, 12 months or more, gross unrealized losses		13.2
Total, fair value		864.4
Total, gross unrealized losses		17.6
Municipal bonds
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	543.2
Securities, less than 12 months, gross unrealized losses	8.2
Securities, 12 months or more, fair value	215.2
Securities, 12 months or more, gross unrealized losses	8.9
Total, fair value	758.4
Total, gross unrealized losses	17.1
Securities, less than 12 months, fair value		240.0
Securities, less than 12 months, gross unrealized losses		1.5
Securities, 12 months or more, fair value		267.3
Securities, 12 months or more, gross unrealized losses		5.1
Total, fair value		507.3
Total, gross unrealized losses		6.6
Foreign government obligations
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	189.9
Securities, less than 12 months, gross unrealized losses	2.1
Securities, 12 months or more, fair value	130.5
Securities, 12 months or more, gross unrealized losses	3.6
Total, fair value	320.4
Total, gross unrealized losses	5.7
Securities, less than 12 months, fair value		321.9
Securities, less than 12 months, gross unrealized losses		2.7
Securities, 12 months or more, fair value		72.2
Securities, 12 months or more, gross unrealized losses		2.0
Total, fair value		394.1
Total, gross unrealized losses		4.7
U.S. corporate bonds
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	1,355.7
Securities, less than 12 months, gross unrealized losses	32.1
Securities, 12 months or more, fair value	174.1
Securities, 12 months or more, gross unrealized losses	9.8
Total, fair value	1,529.8
Total, gross unrealized losses	41.9
Securities, less than 12 months, fair value		568.8
Securities, less than 12 months, gross unrealized losses		6.1
Securities, 12 months or more, fair value		207.3
Securities, 12 months or more, gross unrealized losses		3.6
Total, fair value		776.1
Total, gross unrealized losses		9.7
Foreign corporate bonds
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	656.7
Securities, less than 12 months, gross unrealized losses	12.7
Securities, 12 months or more, fair value	189.2
Securities, 12 months or more, gross unrealized losses	6.3
Total, fair value	845.9
Total, gross unrealized losses	19.0
Securities, less than 12 months, fair value		417.4
Securities, less than 12 months, gross unrealized losses		3.0
Securities, 12 months or more, fair value		159.4
Securities, 12 months or more, gross unrealized losses		3.5
Total, fair value		576.8
Total, gross unrealized losses		6.5
RMBS
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	887.3
Securities, less than 12 months, gross unrealized losses	21.3
Securities, 12 months or more, fair value	116.5
Securities, 12 months or more, gross unrealized losses	5.4
Total, fair value	1,003.8
Total, gross unrealized losses	26.7
Securities, less than 12 months, fair value		284.2
Securities, less than 12 months, gross unrealized losses		1.6
Securities, 12 months or more, fair value		131.5
Securities, 12 months or more, gross unrealized losses		3.0
Total, fair value		415.7
Total, gross unrealized losses		4.6
CMBS
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	277.9
Securities, less than 12 months, gross unrealized losses	4.6
Securities, 12 months or more, fair value	32.3
Securities, 12 months or more, gross unrealized losses	2.8
Total, fair value	310.2
Total, gross unrealized losses	7.4
Securities, less than 12 months, fair value		112.2
Securities, less than 12 months, gross unrealized losses		0.5
Securities, 12 months or more, fair value		34.7
Securities, 12 months or more, gross unrealized losses		1.8
Total, fair value		146.9
Total, gross unrealized losses		2.3
Other asset-backed securities
Available-for-sale [Line Items]
Securities, less than 12 months, fair value	982.2
Securities, less than 12 months, gross unrealized losses	6.4
Securities, 12 months or more, fair value	27.7
Securities, 12 months or more, gross unrealized losses	0.4
Total, fair value	1,009.9
Total, gross unrealized losses	$ 6.8
Securities, less than 12 months, fair value		211.1
Securities, less than 12 months, gross unrealized losses		0.9
Securities, 12 months or more, fair value		65.7
Securities, 12 months or more, gross unrealized losses		0.4
Total, fair value		276.8
Total, gross unrealized losses		1.3
Debt Securities
Available-for-sale [Line Items]
Securities, less than 12 months, fair value		2,603.4
Securities, less than 12 months, gross unrealized losses		20.7
Securities, 12 months or more, fair value		1,354.7
Securities, 12 months or more, gross unrealized losses		32.6
Total, fair value		3,958.1
Total, gross unrealized losses		53.3
Common Stock
Available-for-sale [Line Items]
Securities, less than 12 months, fair value		145.7
Securities, less than 12 months, gross unrealized losses		3.8
Total, fair value		145.7
Total, gross unrealized losses		3.8
Equity Securities
Available-for-sale [Line Items]
Securities, less than 12 months, fair value		145.7
Securities, less than 12 months, gross unrealized losses		3.8
Total, fair value		145.7
Total, gross unrealized losses		$ 3.8

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Activity in the Liability for Loss and Loss Adjustment Expense (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves as of January 1				$ 11,871,250	$ 11,087,200
Less: reinsurance recoverables	[1]			1,650,100	1,236,200
Net reserves as of January 1				10,221,200	9,851,000
Other adjustments				2,000
Incurred loss and LAE, net of reinsurance, related to:
Current year				1,546,700	1,545,600
Prior years		$ (52,200)	$ (63,600)	(137,900)	(111,400)
Total incurred loss and LAE, net of reinsurance		738,210	734,886	1,408,788	1,434,191
Paid loss and LAE, net of reinsurance, related to:
Current year	[2]			237,600	242,700
Prior years	[2]			1,366,100	1,190,100
Total paid loss and LAE, net of reinsurance	[2]			1,603,700	1,432,800
Foreign currency exchange rate effect				(24,200)	55,400
Net reserves as of June 30		10,004,100	9,907,800	10,004,100	9,907,800
Reinsurance recoverables as of June 30	[1]	1,511,400	1,152,400	1,511,400	1,152,400
Reserves as of June 30		$ 11,515,493	$ 11,060,200	$ 11,515,493	$ 11,060,200

[1] Reinsurance recoverables in this table include only ceded loss and LAE reserves.

[2] Includes paid losses, net of reinsurance, related to commutations.

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(Favorable) Unfavorable Prior Accident Year Loss Reserve Development (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017
Claims Development [Line Items]
Claims incurred related to prior years		$ (52.2)		$ (63.6)		$ (137.9)		$ (111.4)
Reinsurance Segment
Claims Development [Line Items]
Claims incurred related to prior years		(50.7)		(52.6)		(122.3)		(90.9)
Reinsurance Segment | Property
Claims Development [Line Items]
Claims incurred related to prior years		(13.7)		(22.9)		(55.1)		(54.4)
Reinsurance Segment | Property | Property Catastrophe
Claims Development [Line Items]
Claims incurred related to prior years		5.1	[1]	(4.0)	[2]	(25.3)	[3]	(4.4)	[2]
Reinsurance Segment | Property | Property Non-catastrophe
Claims Development [Line Items]
Claims incurred related to prior years		(18.8)	[4]	(18.9)	[5]	(29.8)	[4]	(50.0)	[5]
Reinsurance Segment | Casualty & Other
Claims Development [Line Items]
Claims incurred related to prior years		(37.0)		(29.7)		(67.2)		(36.5)
Reinsurance Segment | Casualty & Other | Ogden Rate Impact
Claims Development [Line Items]
Claims incurred related to prior years	[6]							24.4
Reinsurance Segment | Casualty & Other | Malpractice Treaties
Claims Development [Line Items]
Claims incurred related to prior years	[7]	(3.4)		(2.0)		(3.4)		(2.0)
Reinsurance Segment | Casualty & Other | All Other Casualty and Other
Claims Development [Line Items]
Claims incurred related to prior years		(33.6)	[8]	(27.7)	[9]	(63.8)	[10]	(58.9)	[9]
Insurance Segment | RSUI
Claims Development [Line Items]
Claims incurred related to prior years		(1.4)		(10.3)		(12.5)		(18.7)
Insurance Segment | RSUI | Casualty Insurance
Claims Development [Line Items]
Claims incurred related to prior years		(1.5)	[11]	(9.5)	[12]	(12.5)	[13]	(21.6)	[12]
Insurance Segment | RSUI | Property and Other Insurance
Claims Development [Line Items]
Claims incurred related to prior years		0.1		(0.8)				2.9	[14]
Insurance Segment | CapSpecialty Incorporated
Claims Development [Line Items]
Claims incurred related to prior years		$ (0.1)		(0.2)	[15]	$ (3.1)	[16]	(0.8)	[15]
Insurance Segment | Pacific Comp
Claims Development [Line Items]
Claims incurred related to prior years	[17]			$ (0.5)				$ (1.0)

[1] Primarily reflects unfavorable prior accident year loss reserve development related to Hurricane Maria that occurred in the 2017 accident year, partially offset by favorable prior accident year loss reserve development related to Hurricane Harvey that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

[2] Primarily reflects favorable prior accident year loss reserve development related to catastrophes that occurred in the 2010 through 2016 accident years.

[3] Primarily reflects favorable prior accident year loss reserve development related to Hurricanes Harvey and Maria that occurred in the 2017 accident year and catastrophes that occurred in the 2016 accident year.

[4] Primarily reflects favorable prior accident year loss reserve development in the 2016 and 2017 accident years.

[5] Primarily reflects favorable prior accident year loss reserve development in the 2013 through 2016 accident years.

[6] Represents unfavorable prior accident year loss reserve development related to the U.K. Ministry of Justice's significant reduction in the discount rate, referred to as the Ogden rate, used to calculate lump-sum bodily injury payouts in personal injury insurance claims in the U.K to negative 0.75 percent as of March 20, 2017 from 2.50 percent.

[7] Represents certain medical malpractice treaties pursuant to which the increased underwriting profits created by the favorable prior accident year loss reserve development are largely retained by the cedants. As a result, the favorable prior accident year loss reserve development is largely offset by an increase in profit commission expense incurred when such favorable prior accident year loss reserve development occurs.

[8] Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2015 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

[9] Primarily reflects favorable prior accident year loss reserve development in the longer-tailed U.S. professional liability lines of business in the 2005 through 2014 accident years, partially offset by unfavorable development in the shorter-tailed casualty lines of business in the 2015 accident year in the U.S. and in the U.K.

[10] Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed casualty lines of business in the 2016 and 2017 accident years and the longer-tailed lines of business in the 2008 through 2010 accident years.

[11] Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors' and officers' liability lines of business in the 2012 accident year.

[12] Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2011 accident years.

[13] Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess lines of business in the 2005 through 2012 accident years, partially offset by unfavorable prior accident year loss reserve development in the directors' and officers' liability lines of business in the 2009 and 2012 accident years.

[14] Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business in the 2015 and 2016 accident years.

[15] Primarily reflects favorable prior accident year loss reserve development in the casualty lines of business in the 2010 and 2015 accident years.

[16] Primarily reflects favorable prior accident year loss reserve development in the surety lines of business in the 2016 and 2017 accident years.

[17] Primarily reflects favorable prior accident year loss reserve development in the 2013 and prior accident years.

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(Favorable) Unfavorable Prior Accident Year Loss Reserve Development (Parenthetical) (Detail)	Mar. 20, 2017	Mar. 19, 2017
Claims Development [Line Items]
Ogden discount rate	(0.75%)	2.50%

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Effective income tax rate	19.10%	27.60%
Statutory federal income tax rate	21.00%	35.00%	35.00%
Interest or penalties accrued for uncertain tax positions	$ 0.0

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	6 Months Ended
	Mar. 15, 2018	Feb. 28, 2018	Jun. 30, 2018	Nov. 30, 2015
Stockholders Equity Note [Line Items]
Par value of common stock			$ 1.00
Dividends paid	$ 154,000		$ 153,967
Dividend Declared [Member]
Stockholders Equity Note [Line Items]
Dividend record date		Mar. 05, 2018
Special dividend per share		$ 10
Dividend payable nature		Special
2015 Repurchase Program
Stockholders Equity Note [Line Items]
Aggregate amount of common stock authorized for repurchase				$ 400,000
2018 Repurchase Program
Stockholders Equity Note [Line Items]
Aggregate amount of common stock authorized for repurchase			400,000
2015 Repurchase Program and 2018 Repurchase Program
Stockholders Equity Note [Line Items]
Remaining authorized repurchases under share repurchase program			$ 527,100

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Schedule of Common Stock Repurchases (Detail) - 2015 Repurchase Program - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Schedule Of Common Share Purchase [Line Items]
Shares repurchased	368,551	403,623
Cost of shares repurchased (in millions)	$ 214.8	$ 236.1
Average price per share repurchased	$ 582.92	$ 584.96

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Reconciliation of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Jan. 01, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				$ 8,514,063
Other comprehensive income (loss), net of tax:
Reclassifications from accumulated other comprehensive income		$ (5,100)	$ (3,600)	(3,700)	$ (40,300)
Ending Balance		8,404,389		8,404,389
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				618,100	109,300
Cumulative effect of adoption of new accounting pronouncements	[1]					$ (600,500)	$ 12,900
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications				(186,200)	281,400
Reclassifications from accumulated other comprehensive income				(3,700)	(40,300)
Total				(189,900)	241,100
Ending Balance		(172,300)	363,300	(172,300)	363,300
Accumulated Other Comprehensive Income | Accounting Standards Update 2016-01
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative effect of adoption of new accounting pronouncements	[1]					(735,600)
Accumulated Other Comprehensive Income | Accounting Standards Update 2018-02
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative effect of adoption of new accounting pronouncements	[1]					135,100
Accumulated Unrealized Gain (Loss) on Investments in Available-For-Sale Debt and Equity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance					232,200
Cumulative effect of adoption of new accounting pronouncements	[1]						$ 12,900
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications					266,700
Reclassifications from accumulated other comprehensive income					(40,300)
Total					226,400
Ending Balance			471,500		471,500
Unrealized Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(84,600)	(111,200)
Cumulative effect of adoption of new accounting pronouncements	[1]					(18,200)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications				(5,400)	15,000
Total				(5,400)	15,000
Ending Balance		(108,200)	(96,200)	(108,200)	(96,200)
Unrealized Currency Translation Adjustment | Accounting Standards Update 2018-02
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative effect of adoption of new accounting pronouncements	[1]					(18,200)
Retirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(15,500)	(11,700)
Cumulative effect of adoption of new accounting pronouncements	[1]					(3,300)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications				(1,100)	(300)
Total				(1,100)	(300)
Ending Balance		(19,900)	$ (12,000)	(19,900)	$ (12,000)
Retirement Plans | Accounting Standards Update 2018-02
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative effect of adoption of new accounting pronouncements	[1]					(3,300)
Unrealized Appreciation of Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				718,200
Cumulative effect of adoption of new accounting pronouncements	[1]					(579,000)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications				(179,700)
Reclassifications from accumulated other comprehensive income				(3,700)
Total				(183,400)
Ending Balance		$ (44,200)		$ (44,200)
Unrealized Appreciation of Investments | Accounting Standards Update 2016-01
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative effect of adoption of new accounting pronouncements	[1]					(735,600)
Unrealized Appreciation of Investments | Accounting Standards Update 2018-02
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative effect of adoption of new accounting pronouncements	[1]					$ 156,600

[1] See Note 1(c) of this Form 10-Q for additional information regarding Alleghany's adoption of new investment accounting guidance and new guidance on certain tax effects caused by the Tax Act.

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Reclassifications of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized capital gains		$ (6,462)	$ (9,268)	$ (50,967)	$ (68,919)
Other than temporary impairment losses				511
Other than temporary impairment losses			3,747		6,964
Income taxes		73,440	37,461	110,862	96,011
Total reclassifications		(5,100)	(3,600)	(3,700)	(40,300)
Accumulated Unrealized Gain (Loss) on Investments in Available-For-Sale Debt and Equity Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications					(40,300)
Unrealized Appreciation of Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications				(3,700)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Unrealized Gain (Loss) on Investments in Available-For-Sale Debt and Equity Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized capital gains	[1]		(9,300)		(68,900)
Other than temporary impairment losses			3,800		7,000
Income taxes			$ 1,900		$ 21,600
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Appreciation of Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized capital gains	[1]	(6,500)		(5,300)
Other than temporary impairment losses				500
Income taxes		$ 1,400		$ 1,100

[1] For the six month period ended June 30, 2018, excludes a $45.7 million pre-tax gain from AIHL's conversion of its limited partnership interests in certain subsidiaries of Ares into Ares common units. See Note 3(h) of this Form 10-Q for additional information.

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Reclassifications of Accumulated Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 15, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized capital gains		$ 6,462	$ 9,268	$ 50,967	$ 68,919
Ares
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized capital gains				45,700
Ares | Insurance Segment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized capital gains	$ 45,700			$ 45,700

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Reconciliation of Earnings and Share Data used in Basic and Diluted Earnings per Share Computations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share Disclosure [Line Items]
Net earnings available to Alleghany stockholders	$ 295,116	$ 101,811	$ 466,691	$ 250,987
Effect of dilutive securities	0	0	0	0
Income available to common stockholders for diluted earnings per share	$ 295,100	$ 101,800	$ 466,700	$ 251,000
Weighted average common shares outstanding applicable to basic earnings per share	15,180,075	15,419,034	15,284,679	15,416,366
Effect of dilutive securities			4,915	5,703
Adjusted weighted average common shares outstanding applicable to diluted earnings per share	15,180,075	15,419,034	15,289,594	15,422,069

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Earnings Per Share of Common Stock - Additional Information (Detail) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Line Items]
Shares excluded in diluted earnings per share computation	57,766	75,035

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Line Items]
Investments, debt securities	$ 12,155,866	$ 12,721,399
Investments, equity securities	4,714,079
Stockholders' equity	8,404,389	$ 8,514,063
Energy Sector Business
Commitments and Contingencies Disclosure [Line Items]
Investments and equity in consolidated subsidiaries	920,000
Investments, debt securities	289,600
Investments, equity securities	487,100
Energy Sector Business | Stranded Oil Resources Corporation
Commitments and Contingencies Disclosure [Line Items]
Stockholders' equity	$ 143,300

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Segments of Business - Additional Information (Detail) $ in Thousands		6 Months Ended	12 Months Ended
	Feb. 07, 2018 USD ($)	Jun. 30, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Aug. 01, 2017	Apr. 28, 2017
Segment Reporting Information [Line Items]
Number of reportable segments | Segment		3
Debt amount		$ 1,569,367	$ 1,484,897
WWSC Holdings, LLC
Segment Reporting Information [Line Items]
Business acquisition date		Apr. 28, 2017
WWSC Holdings, LLC | Hirschfeld Holdings, LP
Segment Reporting Information [Line Items]
Business acquisition date		Feb. 07, 2018
Wilbert Funeral Services, Inc
Segment Reporting Information [Line Items]
Equity interest percentage		45.00%		45.00%
Operating Segments | Alleghany Capital Corporation Segment
Segment Reporting Information [Line Items]
Debt amount		$ 185,400
Operating Segments | Alleghany Capital Corporation Segment | WWSC Holdings, LLC
Segment Reporting Information [Line Items]
Business acquisition date		Apr. 28, 2017
Ownership interest acquired					80.00%
Operating Segments | Alleghany Capital Corporation Segment | WWSC Holdings, LLC
Segment Reporting Information [Line Items]
Debt amount		$ 95,000
Operating Segments | Alleghany Capital Corporation Segment | WWSC Holdings, LLC | Hirschfeld Holdings, LP
Segment Reporting Information [Line Items]
Business acquisition date	Feb. 07, 2018
Purchase price for acquisition	$ 111,300
Cash consideration for acquisition	96,600
Incremental debt acquired	$ 14,700
Operating Segments | Alleghany Capital Corporation Segment | Jazwares, LLC
Segment Reporting Information [Line Items]
Debt amount		41,000
Operating Segments | Alleghany Capital Corporation Segment | Bourn & Koch, Inc.
Segment Reporting Information [Line Items]
Debt amount		14,600
Operating Segments | Alleghany Capital Corporation Segment | Integrated Project Services LLC
Segment Reporting Information [Line Items]
Debt amount		15,700
Operating Segments | Alleghany Capital Corporation Segment | Kentucky Trailer
Segment Reporting Information [Line Items]
Debt amount		$ 19,100
Pacific Comp
Segment Reporting Information [Line Items]
Disposal date			Dec. 31, 2017

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Results for Reportable Segments and Corporate Activities (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Gross premiums written		$ 1,472,700	$ 1,450,000	$ 2,931,500	$ 2,870,900
Net premiums written		1,275,800	1,293,100	2,529,200	2,526,200
Net premiums earned		1,236,959	1,243,929	2,444,815	2,453,117
Net loss and LAE		738,210	734,886	1,408,788	1,434,191
Commissions, brokerage and other underwriting expenses		402,083	413,737	808,378	822,252
Underwriting (loss) profit	[1]	96,700	95,300	227,600	196,700
Net investment income		126,273	101,656	250,399	217,194
Change in the fair value of equity securities		185,245		142,596
Net realized capital gains		6,462	9,268	50,967	68,919
Other than temporary impairment losses				(511)
Other than temporary impairment losses			(3,747)		(6,964)
Other operating expenses		343,165	225,170	608,062	400,308
Corporate administration		14,119	14,405	21,904	31,290
Amortization of intangible assets		5,966	4,611	11,230	8,375
Interest expense		22,277	20,989	43,808	41,924
Earnings (losses) before income taxes		371,844	140,120	580,448	348,030
Noninsurance Revenue
Segment Reporting Information [Line Items]
Noninsurance revenue		342,725	202,812	594,352	354,104
Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written		1,479,200	1,455,700	2,943,900	2,882,100
Net premiums written		1,275,800	1,293,100	2,529,200	2,526,200
Net premiums earned		1,237,000	1,243,900	2,444,800	2,453,100
Net loss and LAE		738,200	734,900	1,408,800	1,434,200
Commissions, brokerage and other underwriting expenses		402,100	413,700	808,400	822,200
Underwriting (loss) profit	[1]	96,700	95,300	227,600	196,700
Net investment income		122,300	98,200	242,500	210,800
Change in the fair value of equity securities		146,800		132,700
Net realized capital gains		6,700	9,400	51,200	69,500
Other than temporary impairment losses				(500)
Other than temporary impairment losses			(3,800)		(7,000)
Other operating expenses		334,400	215,300	591,400	380,100
Corporate administration		800	800	500	1,600
Amortization of intangible assets		6,000	4,600	11,200	8,400
Interest expense		9,200	7,800	17,200	15,400
Earnings (losses) before income taxes		355,800	166,700	615,300	407,900
Operating Segments | Noninsurance Revenue
Segment Reporting Information [Line Items]
Noninsurance revenue		333,700	196,100	582,100	343,400
Operating Segments | Reinsurance Segment
Segment Reporting Information [Line Items]
Gross premiums written		1,071,700	1,045,400	2,187,300	2,101,100
Net premiums written		976,600	978,800	1,973,700	1,928,200
Net premiums earned		981,300	957,400	1,941,500	1,883,500
Net loss and LAE		593,500	573,000	1,132,900	1,130,100
Commissions, brokerage and other underwriting expenses		318,000	322,200	640,000	637,700
Underwriting (loss) profit	[1]	69,800	62,200	168,600	115,700
Operating Segments | Reinsurance Segment | Property
Segment Reporting Information [Line Items]
Gross premiums written		345,100	369,100	742,300	744,500
Net premiums written		275,900	317,200	581,000	602,400
Net premiums earned		292,100	270,500	567,200	557,300
Net loss and LAE		153,500	122,900	250,100	244,700
Commissions, brokerage and other underwriting expenses		94,800	87,900	187,900	178,700
Underwriting (loss) profit	[1]	43,800	59,700	129,200	133,900
Operating Segments | Reinsurance Segment | Casualty & Other
Segment Reporting Information [Line Items]
Gross premiums written	[2]	726,600	676,300	1,445,000	1,356,600
Net premiums written	[2]	700,700	661,600	1,392,700	1,325,800
Net premiums earned	[2]	689,200	686,900	1,374,300	1,326,200
Net loss and LAE	[2]	440,000	450,100	882,800	885,400
Commissions, brokerage and other underwriting expenses	[2]	223,200	234,300	452,100	459,000
Underwriting (loss) profit	[1],[2]	26,000	2,500	39,400	(18,200)
Operating Segments | Insurance Segment
Segment Reporting Information [Line Items]
Gross premiums written		407,500	410,300	756,600	781,000
Net premiums written		299,200	314,300	555,500	598,000
Net premiums earned		255,700	286,500	503,300	569,600
Net loss and LAE		144,700	161,900	275,900	304,100
Commissions, brokerage and other underwriting expenses		84,100	91,500	168,400	184,500
Underwriting (loss) profit	[1]	26,900	33,100	59,000	81,000
Operating Segments | Insurance Segment | RSUI
Segment Reporting Information [Line Items]
Gross premiums written		318,800	295,100	593,400	559,600
Net premiums written		216,900	204,600	403,800	387,200
Net premiums earned		184,700	178,500	365,600	361,200
Net loss and LAE		105,700	93,800	202,600	174,400
Commissions, brokerage and other underwriting expenses		53,700	53,000	107,200	107,900
Underwriting (loss) profit	[1]	25,300	31,700	55,800	78,900
Operating Segments | Insurance Segment | CapSpecialty Incorporated
Segment Reporting Information [Line Items]
Gross premiums written		88,700	73,300	163,200	138,800
Net premiums written		82,300	68,400	151,700	129,400
Net premiums earned		71,000	64,100	137,700	126,200
Net loss and LAE		39,000	35,600	73,300	68,700
Commissions, brokerage and other underwriting expenses		30,400	27,200	61,200	54,900
Underwriting (loss) profit	[1]	1,600	1,300	3,200	2,600
Operating Segments | Insurance Segment | Pacific Comp
Segment Reporting Information [Line Items]
Gross premiums written			41,900		82,600
Net premiums written			41,300		81,400
Net premiums earned			43,900		82,200
Net loss and LAE			32,500		61,000
Commissions, brokerage and other underwriting expenses			11,300		21,700
Underwriting (loss) profit	[1]		100		(500)
Operating Segments | Reinsurance Segment and Insurance Segment
Segment Reporting Information [Line Items]
Gross premiums written		1,479,200	1,455,700	2,943,900	2,882,100
Net premiums written		1,275,800	1,293,100	2,529,200	2,526,200
Net premiums earned		1,237,000	1,243,900	2,444,800	2,453,100
Net loss and LAE		738,200	734,900	1,408,800	1,434,200
Commissions, brokerage and other underwriting expenses		402,100	413,700	808,400	822,200
Underwriting (loss) profit	[1]	96,700	95,300	227,600	196,700
Net investment income		121,100	98,000	239,400	210,300
Change in the fair value of equity securities		146,800		132,700
Net realized capital gains		6,800	9,200	50,700	69,400
Other than temporary impairment losses				(500)
Other than temporary impairment losses			(3,800)		(7,000)
Other operating expenses		19,900	25,900	37,000	49,100
Corporate administration		800	800	500	1,600
Amortization of intangible assets		200	(400)		(900)
Interest expense		6,900	6,800	13,600	13,600
Earnings (losses) before income taxes		348,300	168,900	609,200	411,800
Operating Segments | Reinsurance Segment and Insurance Segment | Noninsurance Revenue
Segment Reporting Information [Line Items]
Noninsurance revenue		4,700	3,300	10,400	5,800
Operating Segments | Alleghany Capital
Segment Reporting Information [Line Items]
Net investment income		1,200	200	3,100	500
Net realized capital gains		(100)	200	500	100
Other operating expenses		314,500	189,400	554,400	331,000
Amortization of intangible assets		5,800	5,000	11,200	9,300
Interest expense		2,300	1,000	3,600	1,800
Earnings (losses) before income taxes		7,500	(2,200)	6,100	(3,900)
Operating Segments | Alleghany Capital | Noninsurance Revenue
Segment Reporting Information [Line Items]
Noninsurance revenue		329,000	192,800	571,700	337,600
Corporate Activities
Segment Reporting Information [Line Items]
Gross premiums written	[3]	(6,500)	(5,700)	(12,400)	(11,200)
Net investment income	[3]	4,000	3,500	7,900	6,400
Change in the fair value of equity securities	[3]	38,400		9,900
Net realized capital gains	[3]	(200)	(100)	(200)	(600)
Other operating expenses	[3]	8,800	9,900	16,700	20,200
Corporate administration	[3]	13,300	13,600	21,400	29,700
Interest expense	[3]	13,100	13,200	26,600	26,500
Earnings (losses) before income taxes	[3]	16,000	(26,600)	(34,800)	(59,900)
Corporate Activities | Noninsurance Revenue
Segment Reporting Information [Line Items]
Noninsurance revenue	[3]	$ 9,000	$ 6,700	$ 12,300	$ 10,700

[1] Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, OTTI losses, noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its reinsurance and insurance segments' operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company's ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.

[2] Primarily consists of the following assumed reinsurance lines of business: directors' and officers' liability; errors and omissions liability; general liability; medical malpractice; ocean marine and aviation; auto liability; accident and health; surety; and credit.

[3] Includes elimination of minor reinsurance activity between segments.

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Summary of Identifiable Assets and Equity (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Identifiable Assets	$ 25,085,887	$ 25,384,317
Invested Assets and Cash	19,267,200
Equity attributable to Alleghany	8,404,389	$ 8,514,063
Operating Segments
Segment Reporting Information [Line Items]
Identifiable Assets	24,523,100
Invested Assets and Cash	18,781,600
Equity attributable to Alleghany	8,877,200
Operating Segments | Reinsurance Segment
Segment Reporting Information [Line Items]
Identifiable Assets	16,356,900
Invested Assets and Cash	13,387,800
Equity attributable to Alleghany	5,208,500
Operating Segments | Insurance Segment
Segment Reporting Information [Line Items]
Identifiable Assets	6,837,900
Invested Assets and Cash	5,263,300
Equity attributable to Alleghany	2,891,500
Operating Segments | Reinsurance Segment and Insurance Segment
Segment Reporting Information [Line Items]
Identifiable Assets	23,194,800
Invested Assets and Cash	18,651,100
Equity attributable to Alleghany	8,100,000
Operating Segments | Alleghany Capital
Segment Reporting Information [Line Items]
Identifiable Assets	1,328,300
Invested Assets and Cash	130,500
Equity attributable to Alleghany	777,200
Corporate Activities
Segment Reporting Information [Line Items]
Identifiable Assets	562,800
Invested Assets and Cash	485,600
Equity attributable to Alleghany	$ (472,800)

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Summary of Alleghany Capital Non-Insurance Revenue (Detail) - Noninsurance Revenue - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Revenues [Line Items]
Noninsurance revenue		$ 342,725	$ 202,812	$ 594,352	$ 354,104
Operating Segments
Other Revenues [Line Items]
Noninsurance revenue		333,700	196,100	582,100	343,400
Operating Segments | Alleghany Capital
Other Revenues [Line Items]
Noninsurance revenue		329,000	192,800	571,700	337,600
Operating Segments | Alleghany Capital | Industrial Segment
Other Revenues [Line Items]
Noninsurance revenue	[1]	221,900	74,500	367,400	116,400
Operating Segments | Alleghany Capital | Non-industrial Segment
Other Revenues [Line Items]
Noninsurance revenue	[2]	$ 107,100	$ 118,300	204,200	$ 221,200
Operating Segments | Alleghany Capital | Corporate & Other
Other Revenues [Line Items]
Noninsurance revenue				$ 100

[1] For the three and six months ended June 30, 2018, the vast majority of noninsurance revenues were recognized as goods and services transferred to customers over time. For the three and six months ended June 30, 2017, approximately 66 percent and 57 percent, respectively, of noninsurance revenues were recognized as services were transferred to customers over time, with the remainder recognized as goods transferred at a point in time. See Note 1(c) of this Form 10-Q for additional information regarding Alleghany's adoption of new revenue recognition accounting guidance effective in the first quarter of 2018.

[2] For the three and six months ended June 30, 2018, approximately 70 percent of noninsurance revenues were recognized as services transferred to customers over time, with the remainder recognized as goods transferred at a point in time. For the three and six months ended June 30, 2017, approximately 75 percent and 78 percent, respectively, of noninsurance revenues were recognized as services were transferred to customers over time, with the remainder recognized as goods were transferred at a point in time. See Note 1(c) of this Form 10-Q for additional information regarding Alleghany's adoption of new revenue recognition accounting guidance effective in the first quarter of 2018.

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Summary of Alleghany Capital Non-Insurance Revenue (Parenthetical) (Detail) - Operating Segments - Alleghany Capital - Transferred over Time [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Industrial Segment
Other Revenues [Line Items]
Noninsurance revenue percentage		66.00%		57.00%
Non-industrial Segment
Other Revenues [Line Items]
Noninsurance revenue percentage	70.00%	75.00%	70.00%	78.00%