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 SEPTEMBER 30, 2017

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.

15,389,970 SHARES, PAR VALUE $1.00 PER SHARE, AS OF OCTOBER 26, 2017

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		24
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk		66
ITEM 4.	Controls and Procedures		67
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 4.	Mine Safety Disclosures		69
ITEM 6.	Exhibits		70
SIGNATURES			71

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements.

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Balance Sheets

	September 30, 2017		December 31, 2016
	(unaudited)
	($ in thousands, except share amounts)
Assets
Investments:
Available-for-sale securities at fair value:
Equity securities (cost: 2017 – $3,174,837; 2016 – $2,816,572)	$	3,821,601	$	3,109,523
Debt securities (amortized cost: 2017 – $13,027,581; 2016 – $12,927,103)		13,212,395		12,983,213
Short-term investments		547,787		778,410
		17,581,783		16,871,146
Commercial mortgage loans		649,700		594,878
Other invested assets		739,339		645,245
Total investments		18,970,822		18,111,269
Cash		701,841		594,091
Accrued investment income		107,095		113,763
Premium balances receivable		877,780		743,692
Reinsurance recoverables		1,738,391		1,272,219
Ceded unearned premiums		208,391		201,023
Deferred acquisition costs		476,634		448,634
Property and equipment at cost, net of accumulated depreciation and amortization		130,524		112,920
Goodwill		333,748		284,974
Intangible assets, net of amortization		464,956		378,680
Current taxes receivable		83,634		25,950
Net deferred tax assets		266,267		354,852
Funds held under reinsurance agreements		685,824		591,602
Other assets		668,328		522,922
Total assets	$	25,714,235	$	23,756,591
Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity
Loss and loss adjustment expenses	$	12,456,375	$	11,087,199
Unearned premiums		2,295,954		2,175,498
Senior Notes and other debt		1,486,375		1,476,489
Reinsurance payable		143,283		90,659
Other liabilities		1,027,746		912,081
Total liabilities		17,409,733		15,741,926
Redeemable noncontrolling interests		103,479		74,720
Common stock (shares authorized: 2017 and 2016 – 22,000,000; shares issued: 2017 and 2016 – 17,459,961)		17,460		17,460
Contributed capital		3,611,900		3,611,993
Accumulated other comprehensive income		438,403		109,284
Treasury stock, at cost (2017 – 2,056,203 shares; 2016 – 2,049,797 shares)		(817,618)		(812,840)
Retained earnings		4,950,878		5,014,048
Total stockholders’ equity attributable to Alleghany stockholders		8,201,023		7,939,945
Total liabilities, redeemable noncontrolling interest and stockholders’ equity	$	25,714,235	$	23,756,591

See accompanying Notes to Unaudited Consolidated Financial Statements.

1

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Earnings and Comprehensive Income

(unaudited)

	Three Months Ended September 30,
	2017		2016
	($ in thousands, except per share amounts)
Revenues
Net premiums earned	$	1,239,721	$	1,253,515
Net investment income		104,663		120,603
Net realized capital gains		32,921		27,221
Other than temporary impairment losses		(6,131)		(11,729)
Other revenue		296,309		225,006
Total revenues		1,667,483		1,614,616
Costs and Expenses
Net loss and loss adjustment expenses		1,491,848		718,556
Commissions, brokerage and other underwriting expenses		398,163		423,042
Other operating expenses		277,918		228,408
Corporate administration		(4,689)		10,745
Amortization of intangible assets		5,765		6,008
Interest expense		20,804		20,682
Total costs and expenses		2,189,809		1,407,441
(Losses) earnings before income taxes		(522,326)		207,175
Income taxes		(212,379)		48,328
Net (losses) earnings		(309,947)		158,847
Net earnings attributable to noncontrolling interest		4,210		3,016
Net (losses) earnings attributable to Alleghany stockholders	$	(314,157)	$	155,831
Net (losses) earnings	$	(309,947)	$	158,847
Other comprehensive (loss) income :
Change in unrealized gains (losses), net of deferred taxes of  $52,766 and $25,123 for 2017 and 2016, respectively		97,994		46,657
Less: reclassification for net realized capital gains and other  than temporary impairment losses, net of taxes of ($9,377) and ($5,422) for 2017 and 2016, respectively		(17,414)		(10,070)
Change in unrealized currency translation adjustment, net of deferred  taxes of $3,967 and ($1,637) for 2017 and 2016, respectively		7,368		(3,041)
Retirement plans		98		95
Comprehensive (loss) income		(221,901)		192,488
Comprehensive income attributable to noncontrolling interest		4,210		3,016
Comprehensive (loss) income attributable to Alleghany stockholders	$	(226,111)	$	189,472
Basic (losses) earnings per share attributable to Alleghany stockholders	$	(20.38)	$	10.09
Diluted (losses) earnings per share attributable to Alleghany stockholders		(20.90)		10.09

See accompanying Notes to Unaudited Consolidated Financial Statements.

2

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Earnings and Comprehensive Income

(unaudited)

	Nine Months Ended September 30,
	2017		2016
	($ in thousands, except per share amounts)
Revenues
Net premiums earned	$	3,692,838	$	3,736,596
Net investment income		321,857		332,326
Net realized capital gains		101,840		117,126
Other than temporary impairment losses		(13,095)		(38,216)
Other revenue		650,413		527,765
Total revenues		4,753,853		4,675,597
Costs and Expenses
Net loss and loss adjustment expenses		2,926,039		2,198,512
Commissions, brokerage and other underwriting expenses		1,220,415		1,238,712
Other operating expenses		678,226		575,527
Corporate administration		26,601		33,938
Amortization of intangible assets		14,140		14,490
Interest expense		62,728		61,384
Total costs and expenses		4,928,149		4,122,563
(Losses) earnings before income taxes		(174,296)		553,034
Income taxes		(116,368)		162,274
Net (losses) earnings		(57,928)		390,760
Net earnings attributable to noncontrolling interest		5,242		3,353
Net (losses) earnings attributable to Alleghany stockholders	$	(63,170)	$	387,407
Net (losses) earnings	$	(57,928)	$	390,760
Other comprehensive (loss) income :
Change in unrealized gains (losses), net of deferred taxes of  $196,336 and $128,379 for 2017 and 2016, respectively		364,623		238,418
Less: reclassification for net realized capital gains and other  than temporary impairment losses, net of taxes of ($31,061) and ($22,999) for 2017 and 2016, respectively		(57,684)		(42,712)
Change in unrealized currency translation adjustment, net of deferred  taxes of $12,050 and $10,318 for 2017 and 2016, respectively		22,379		19,162
Retirement plans		(199)		452
Comprehensive (loss) income		271,191		606,080
Comprehensive income attributable to noncontrolling interest		5,242		3,353
Comprehensive (loss) income attributable to Alleghany stockholders	$	265,949	$	602,727
Basic (losses) earnings per share attributable to Alleghany stockholders	$	(4.10)	$	25.09
Diluted (losses) earnings per share attributable to Alleghany stockholders		(4.10)		25.08

See accompanying Notes to Unaudited Consolidated Financial Statements.

3

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Cash Flows

(unaudited)

	Nine Months Ended September 30,
	2017		2016
	($ in thousands)
Cash flows from operating activities
Net (losses) earnings	$	(57,928)	$	390,760
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization		106,197		115,020
Net realized capital (gains) losses		(101,840)		(117,126)
Other than temporary impairment losses		13,095		38,216
(Increase) decrease in reinsurance recoverables, net of reinsurance payable		(413,548)		73,781
(Increase) decrease in premium balances receivable		(134,088)		(44,341)
(Increase) decrease in ceded unearned premiums		(7,368)		(17,588)
(Increase) decrease in deferred acquisition costs		(28,000)		(39,962)
(Increase) decrease in funds held under reinsurance agreements		(94,222)		(299,372)
Increase (decrease) in unearned premiums		120,456		164,078
Increase (decrease) in loss and loss adjustment expenses		1,369,176		258,861
Change in unrealized foreign exchange losses (gains)		(134,404)		78,615
Other, net		(211,479)		(27,283)
Net adjustments		483,975		182,899
Net cash provided by (used in) operating activities		426,047		573,659
Cash flows from investing activities
Purchases of debt securities		(4,181,182)		(4,665,980)
Purchases of equity securities		(3,218,941)		(1,163,687)
Sales of debt securities		2,836,272		3,953,367
Maturities and redemptions of debt securities		1,397,408		996,548
Sales of equity securities		2,970,760		1,197,612
Net (purchases) sales of short-term investments		174,501		(417,186)
Net (purchases) sales and maturities of commercial mortgage loans		(54,822)		(336,944)
(Purchases) sales of property and equipment		10,268		(18,982)
Purchases of affiliates and subsidiaries, net of cash acquired		(244,311)		(145,253)
Other, net		28,302		128,731
Net cash provided by (used in) investing activities		(281,745)		(471,774)
Cash flows from financing activities
Treasury stock acquisitions		(8,549)		(55,678)
Increase (decrease) in other debt		(27,202)		43,135
Other, net		(17,070)		(4,274)
Net cash provided by (used in) financing activities		(52,821)		(16,817)
Effect of exchange rate changes on cash		16,269		8,572
Net increase (decrease) in cash		107,750		93,640
Cash at beginning of period		594,091		475,267
Cash at end of period	$	701,841	$	568,907
Supplemental disclosures of cash flow information
Cash paid during period for:
Interest paid	$	58,133	$	56,423
Income taxes paid (refund received)		29,320		51,969

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, 2016 (the “2016 Form 10-K”) and the Quarterly Reports on Form 10-Q for the quarters ended March 31, 2017 and June 30, 2017 of Alleghany Corporation (“Alleghany”).

Alleghany, 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 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”), CapSpecialty, Inc. (“CapSpecialty”) and Pacific Compensation Corporation (“PacificComp”). CapSpecialty has been a subsidiary of AIHL since January 2002, RSUI has been a subsidiary of AIHL since July 2003 and PacificComp has been a subsidiary of AIHL since July 2007. AIHL Re LLC (“AIHL Re”), a captive reinsurance company which provides reinsurance to Alleghany’s insurance operating subsidiaries and affiliates, has been a wholly-owned subsidiary of Alleghany since its formation in May 2006. Alleghany’s reinsurance operations commenced on March 6, 2012 when Alleghany consummated a merger with Transatlantic Holdings, Inc. (“TransRe”) and TransRe became one of Alleghany’s wholly-owned subsidiaries.

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 capital investments primarily through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s investments are included in other activities for segment reporting purposes and include:

• Stranded Oil Resources Corporation (“SORC”), an exploration and production company focused on enhanced oil recovery, headquartered in Golden, Colorado;

• 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 engineering-focused 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, acquired on April 28, 2017; 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, acquired on August 1, 2017. Wilbert is accounted for under the equity method of accounting and is included in other invested assets.

On April 15, 2016, Alleghany Capital acquired an additional 50 percent of Jazwares’ outstanding equity, bringing its equity ownership interest to 80 percent and, as of that date, the results of Jazwares have been included in Alleghany’s consolidated results. Prior to April 15, 2016, Jazwares was accounted for under the equity method of accounting.

In addition, Alleghany owns and manages properties in the Sacramento, California region through its wholly-owned subsidiary Alleghany Properties Holdings LLC (“Alleghany Properties”). Alleghany’s public equity investments are managed primarily through Alleghany’s wholly-owned subsidiary Roundwood Asset Management LLC.

On September 12, 2017, AIHL signed a definitive agreement to sell PacificComp to CopperPoint Mutual Insurance Company (“CopperPoint”) for total cash consideration of approximately $150 million. 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. The transaction, which is subject to customary regulatory review and approvals, is expected to close on December 31, 2017. Upon closing, Alleghany expects to record an estimated after-tax gain of approximately $25 million, which amount includes a tax benefit. As of September 30, 2017, PacificComp’s total assets were $440.6 million, consisting primarily of debt securities, and PacificComp’s total liabilities were $313.7 million, consisting primarily of loss and loss adjustment expenses (“LAE”) reserves.

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

5

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 accumulated other 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 nine months of 2017, Bourn & Koch had approximately 11 percent noncontrolling interests outstanding, Kentucky Trailer had approximately 21 percent noncontrolling interests outstanding, IPS had approximately 16 percent noncontrolling interests outstanding and Jazwares had approximately 20 percent noncontrolling interests outstanding. W&W|AFCO Steel had approximately 20 percent noncontrolling interests outstanding from its April 28, 2017 acquisition date through September 30, 2017.

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 2016 Form 10-K.

(c) Recent Accounting Standards

Recently Adopted

In May 2015, the Financial Accounting Standards Board (the “FASB”) issued guidance that requires disclosures related to short-duration insurance contracts. The guidance applies to property and casualty insurance and reinsurance entities, among others, and requires the following annual disclosure related to the liability for loss and LAE: (i) net incurred and paid claims development information by accident year for up to ten years; (ii) a reconciliation of incurred and paid claims development information to the aggregate carrying amount of the liability for loss and LAE; (iii) liabilities for losses that have been incurred but not yet reported by accident year and in total; (iv) a description of reserving methodologies (as well as any changes to those methodologies); (v) quantitative information about claim frequency by accident year; and (vi) the average annual percentage payout of incurred claims by age and accident year. In addition, the guidance also requires insurance entities to disclose for annual and interim reporting periods a roll-forward of the liability for loss and LAE. This guidance was effective for annual periods beginning after December 15, 2015 and interim periods within annual periods beginning after December 15, 2016, with early adoption permitted. Alleghany adopted this guidance as of December 31, 2016 and the implementation did not have an impact on its results of operations and financial condition. See Note 5 of this Form 10-Q and Note 1(k) and Note 6 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2016 Form 10-K for the new disclosures.

Future Application of Accounting Standards

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 are not impacted by this guidance. This guidance is effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany will adopt this guidance in the first quarter of 2018 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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) to be measured at fair value with changes in fair value recognized in net income. 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

6

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 will adopt this guidance in the first quarter of 2018. As of January 1, 2018, unrealized gains or losses of equity securities, net of deferred taxes, will be reclassified from accumulated other comprehensive income to retained earnings. Subsequently, all changes in unrealized gains or losses of equity securities, net of deferred taxes, will be presented in the Consolidated Statements of Earnings rather than the Consolidated Statements of Comprehensive Income. Alleghany does not currently believe that the implementation will have a material impact on its financial condition. See Note 3(a) of this Form 10-Q for further information on Alleghany’s unrealized gains and losses of equity securities.

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 2016 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.

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 will adopt this guidance in the fourth quarter of 2017, and will record a cumulative effect reduction directly to opening 2017 retained earnings and an offsetting increase in opening 2017 accumulated other comprehensive income at that time. Alleghany does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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 better aligns hedge accounting with 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 September 30, 2017 and December 31, 2016:

	September 30, 2017				December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	17,590.2	$	17,590.2	$	16,899.2	$	16,899.2
Liabilities
Senior Notes and other debt(2)	$	1,486.4	$	1,655.5	$	1,476.5	$	1,584.3

(1) This table includes AFS investments (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 2016 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 September 30, 2017 and December 31, 2016:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of September 30, 2017
Equity securities:
Common stock	$	3,815.2	$	0.5	$	0.9	$	3,816.6
Preferred stock		-		-		5.0		5.0
Total equity securities		3,815.2		0.5		5.9		3,821.6
Debt securities:
U.S. Government obligations		-		1,020.7		-		1,020.7
Municipal bonds		-		4,131.7		-		4,131.7
Foreign government obligations		-		1,136.2		4.7		1,140.9
U.S. corporate bonds		-		2,202.2		278.8		2,481.0
Foreign corporate bonds		-		1,254.3		39.9		1,294.2
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		-		948.8		5.4		954.2
Commercial mortgage-backed securities (“CMBS”)		-		505.5		11.4		516.9
Other asset-backed securities(2)		-		490.3		1,182.5		1,672.8
Total debt securities		-		11,689.7		1,522.7		13,212.4
Short-term investments		-		547.8		-		547.8
Other invested assets(3)		-		-		8.4		8.4
Total investments (excluding equity method investments and loans)	$	3,815.2	$	12,238.0	$	1,537.0	$	17,590.2
Senior Notes and other debt	$	-	$	1,553.0	$	102.5	$	1,655.5

8

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2016
Equity securities:
Common stock	$	3,105.2	$	-	$	4.3	$	3,109.5
Preferred stock		-		-		-		-
Total equity securities		3,105.2		-		4.3		3,109.5
Debt securities:
U.S. Government obligations		-		1,243.3		-		1,243.3
Municipal bonds		-		4,185.8		-		4,185.8
Foreign government obligations		-		1,047.1		-		1,047.1
U.S. corporate bonds		-		2,120.2		72.9		2,193.1
Foreign corporate bonds		-		1,088.4		0.4		1,088.8
Mortgage and asset-backed securities:
RMBS(1)		-		994.5		5.9		1,000.4
CMBS		-		730.5		4.3		734.8
Other asset-backed securities(2)		-		586.1		903.8		1,489.9
Total debt securities		-		11,995.9		987.3		12,983.2
Short-term investments		-		778.4		-		778.4
Other invested assets(3)		-		-		28.1		28.1
Total investments (excluding equity method investments and  loans)	$	3,105.2	$	12,774.3	$	1,019.7	$	16,899.2
Senior Notes and other debt	$	-	$	1,491.5	$	92.8	$	1,584.3

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

(2) Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

(3) Includes partnership and non-marketable equity investments accounted for on an AFS basis, and excludes investments accounted for using the equity method.

In the nine months ended September 30, 2017, Alleghany transferred $7.2 million of financial instruments out of Level 3 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. There were no transfers of financial instruments out of Level 3 in the third quarter of 2017.

In the three and nine months ended September 30, 2017, Alleghany transferred $0.8 million and $5.5 million, respectively, of financial instruments into Level 3 principally due to a decrease in observable inputs related to the valuation of such assets and, specifically, a decrease in broker quotes. Of the $5.5 million of transfers, $3.8 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 nine months ended September 30, 2017.

In the three and nine months ended September 30, 2016, Alleghany transferred $5.1 million and $5.4 million, respectively, of debt securities out of Level 3 principally due to an increase in observable inputs related to the valuation of such assets and, specifically, an increase in broker quotes. Of the $5.4 million of transfers, $5.1 million related to U.S. corporate bonds and $0.3 million related to other invested assets.

In the three and nine months ended September 30, 2016, Alleghany transfered $5.7 million and $8.4 million, respectively, of securities into Level 3 principally due to a decrease in observable inputs related to the valuation of such assets, and specifically, a decrease in broker quotes. Of the $8.4 million of transfers, $5.5 million related to U.S. corporate bonds, $1.9 million related to foreign corporate bonds and $1.0 million related to common stock. There were no other material transfers between Levels 1, 2 or 3 in the three and nine months ended September 30, 2016.

9

The following tables present reconciliations of the changes during the nine months ended September 30, 2017 and 2016 in Level 3 assets measured at fair value:

	Equity Securities				Debt Securities
											Mortgage and asset-backed
Nine Months Ended September 30, 2017	Common   Stock		Preferred   Stock		Foreign  Government  Obligations		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)		0.2		(0.2)		-		(0.2)		-		0.2		-		3.9		10.8		14.7
Other comprehensive income		-		0.2		-		3.2		0.8		0.3		0.1		15.0		(8.9)		10.7
Purchases		-		5.6		4.7		220.4		38.6		-		9.6		746.7		-		1,025.6
Sales		(2.6)		(0.6)		-		(10.2)		(0.2)		-		(2.2)		(59.5)		(21.6)		(96.9)
Issuances		-		-		-		-		-		-		-		-		-		-
Settlements		-		-		-		(6.3)		-		(1.0)		(0.4)		(427.4)		-		(435.1)
Transfers into Level 3		1.4		-		-		3.8		0.3		-		-		-		-		5.5
Transfers out of Level 3		(2.4)		-		-		(4.8)		-		-		-		-		-		(7.2)
Balance as of September 30, 2017	$	0.9	$	5.0	$	4.7	$	278.8	$	39.9	$	5.4	$	11.4	$	1,182.5	$	8.4	$	1,537.0

			Debt Securities
							Mortgage and asset-backed
Nine Months Ended September 30, 2016	Common     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, 2016	$	-	$	49.8	$	-	$	14.9	$	20.2	$	953.0	$	29.9	$	1,067.8
Net realized/unrealized gains (losses) included in:
Net earnings(2)		(0.1)		(0.5)		-		0.3		(0.1)		2.2		4.2		6.0
Other comprehensive income		1.8		1.4		-		(0.7)		0.8		25.1		(2.9)		25.5
Purchases		2.2		39.4		-		-		-		32.1		-		73.7
Sales		-		(14.5)		-		(7.0)		(8.2)		(70.7)		(4.2)		(104.6)
Issuances		-		-		-		-		-		-		-		-
Settlements		-		(1.7)		-		(1.5)		(0.5)		(33.6)		-		(37.3)
Transfers into Level 3		1.0		5.5		1.9		-		-		-		-		8.4
Transfers out of Level 3		-		(5.1)		-		-		-		-		(0.3)		(5.4)
Balance as of September 30, 2016	$	4.9	$	74.3	$	1.9	$	6.0	$	12.2	$	908.1	$	26.7	$	1,034.1

(1) Includes partnership and non-marketable equity investments accounted for on an AFS basis.

(2) There were no other than temporary impairment (“OTTI”) losses recorded in net earnings related to Level 3 assets still held as of September 30, 2017 and 2016.

Net unrealized losses related to Level 3 assets as of September 30, 2017 and December 31, 2016 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 2016 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 September 30, 2017 and December 31, 2016:

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	($ in millions)
As of September 30, 2017
Equity securities:
Common stock	$	3,170.0	$	662.8	$	(16.2)	$	3,816.6
Preferred stock		4.8		0.2		-		5.0
Total equity securities		3,174.8		663.0		(16.2)		3,821.6
Debt securities:
U.S. Government obligations		1,033.1		1.6		(14.0)		1,020.7
Municipal bonds		4,039.6		106.9		(14.8)		4,131.7
Foreign government obligations		1,134.6		14.0		(7.7)		1,140.9
U.S. corporate bonds		2,425.6		63.6		(8.2)		2,481.0
Foreign corporate bonds		1,270.5		27.1		(3.4)		1,294.2
Mortgage and asset-backed securities:
RMBS		953.9		7.7		(7.4)		954.2
CMBS		509.2		10.0		(2.3)		516.9
Other asset-backed securities(1)		1,661.1		13.4		(1.7)		1,672.8
Total debt securities		13,027.6		244.3		(59.5)		13,212.4
Short-term investments		547.8		-		-		547.8
Total investments	$	16,750.2	$	907.3	$	(75.7)	$	17,581.8
	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	($ in millions)
As of December 31, 2016
Equity securities:
Common stock	$	2,816.6	$	332.1	$	(39.2)	$	3,109.5
Preferred stock		-		-		-		-
Total equity securities		2,816.6		332.1		(39.2)		3,109.5
Debt securities:
U.S. Government obligations		1,265.7		2.2		(24.6)		1,243.3
Municipal bonds		4,161.0		66.9		(42.1)		4,185.8
Foreign government obligations		1,030.9		20.2		(4.0)		1,047.1
U.S. corporate bonds		2,168.9		43.5		(19.3)		2,193.1
Foreign corporate bonds		1,068.3		27.3		(6.8)		1,088.8
Mortgage and asset-backed securities:
RMBS		1,005.9		7.0		(12.5)		1,000.4
CMBS		728.8		9.6		(3.6)		734.8
Other asset-backed securities(1)		1,497.6		4.0		(11.7)		1,489.9
Total debt securities		12,927.1		180.7		(124.6)		12,983.2
Short-term investments		778.4		-		-		778.4
Total investments	$	16,522.1	$	512.8	$	(163.8)	$	16,871.1

(1) Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

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(b) Contractual Maturity

The amortized cost or cost and estimated fair value of debt securities by contractual maturity as of September 30, 2017 are presented below. 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 September 30, 2017
Short-term investments due in one year or less	$	547.8	$	547.8
Mortgage and asset-backed securities(1)		3,124.2		3,143.9
Debt securities with maturity dates:
One year or less		385.2		386.1
Over one through five years		3,089.6		3,124.6
Over five through ten years		3,359.4		3,414.9
Over ten years		3,069.2		3,142.9
Total debt securities		13,027.6		13,212.4
Equity securities		3,174.8		3,821.6
Total	$	16,750.2	$	17,581.8

(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 nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions)
Interest income	$	104.6	$	99.0	$	306.3	$	299.0
Dividend income		6.7		12.2		27.9		35.5
Investment expenses		(5.8)		(6.2)		(20.1)		(19.8)
Equity in results of Pillar Investments(1)		(9.4)		5.9		(2.9)		12.9
Equity in results of Ares(1)		6.9		4.6		(0.4)		5.1
Other investment results		1.7		5.1		11.1		(0.4)
Total	$	104.7	$	120.6	$	321.9	$	332.3

(1) See Note 3(g) of this Form 10-Q for discussion of the Pillar Investments and the investment in Ares, each as defined therein.

As of September 30, 2017, non-income producing invested assets were immaterial.

(d) Realized Gains and Losses

The proceeds from sales of AFS securities were $1.6 billion and $0.8 billion for the three months ended September 30, 2017 and 2016, respectively, and $5.8 billion and $5.2 billion for the nine months ended September 30, 2017 and 2016, respectively.

Realized capital gains and losses for the three and nine months ended September 30, 2017 primarily reflect sales of equity securities and certain exchange-traded funds. Realized capital gains in the first nine months of 2017 include the sale of certain equity securities resulting from a partial restructuring of the equity portfolio. Realized capital gains and losses for the three and nine months ended September 30, 2016 primarily reflect sales of equity and debt securities. In addition, Alleghany Capital recognized a gain of $13.2 million on April 15, 2016 in connection with the acquisition of an additional 50 percent equity ownership in Jazwares, when its pre-existing 30 percent equity ownership was remeasured at estimated fair value (the “Jazwares Remeasurement Gain”).

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The following table presents amounts of gross realized capital gains and gross realized capital losses for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions)
Gross realized capital gains	$	47.0	$	32.7	$	189.7	$	217.7
Gross realized capital losses		(14.1)		(5.5)		(87.9)		(100.6)
Net realized capital gains	$	32.9	$	27.2	$	101.8	$	117.1

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

(e) OTTI Losses

Alleghany holds its equity and debt securities as AFS and, as such, these securities are recorded at fair value. Alleghany continually monitors the difference between cost and the estimated fair value of its equity and 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 cost-basis or 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.

Management’s assessment of equity securities initially involves an evaluation of all securities that are in an unrealized loss position, regardless of the duration or severity of the loss, as of the applicable balance sheet date. Such initial review consists primarily of assessing whether: (i) there has been a negative credit or news event with respect to the issuer that could indicate the existence of an OTTI; and (ii) Alleghany has the ability and intent to hold an equity security for a period of time sufficient to allow for an anticipated recovery (generally considered to be 12 months from the balance sheet date).

To the extent that an equity security in an unrealized loss position is not impaired based on the initial review described above, Alleghany then further evaluates such equity security and deems it to be other than temporarily impaired if it has been in an unrealized loss position for 12 months or more or if its unrealized loss position is greater than 50 percent of its cost, absent compelling evidence to the contrary.

Alleghany then evaluates those equity securities where the unrealized loss is at least 20 percent of cost as of the balance sheet date or that have been in an unrealized loss position continuously for six months or more preceding the balance sheet date. This evaluation takes into account quantitative and qualitative factors in determining whether such securities are other than temporarily impaired including: (i) market valuation metrics associated with the equity security (such as dividend yield and price-to-earnings ratio); (ii) current views on the equity security, as expressed by either Alleghany’s internal stock analysts and/or by third-party stock analysts or rating agencies; and (iii) credit or news events associated with a specific issuer, such as negative news releases and rating agency downgrades with respect to the issuer of the equity security.

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

13

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 nine months of 2017 reflect $13.1 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $13.1 million of OTTI losses, $11.8 million related to equity securities, primarily in the retail sector, and $1.3 million related to debt securities. The determination that unrealized losses on equity and debt 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 $13.1 million of OTTI losses, $6.1 million was incurred in the third quarter of 2017.

OTTI losses in the first nine months of 2016 reflect $38.2 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $38.2 million of OTTI losses, $16.6 million related to equity securities, primarily in the retail, financial services, technology and chemical sectors, and $21.6 million related to debt securities, primarily in the energy sector. The determination that unrealized losses on equity and debt securities were other than temporary was primarily due to the severity and duration of the decline in the fair value of equity and debt securities relative to their costs. Of the $38.2 million of OTTI losses, $11.7 million was incurred in the third quarter of 2016.

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 September 30, 2017 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.

14

(f) Aging of Gross Unrealized Losses

The following tables present gross unrealized losses and related fair values for equity securities and debt securities, grouped by duration of time in a continuous unrealized loss position, as of September 30, 2017 and December 31, 2016:

	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 September 30, 2017
Equity securities:
Common stock	$	998.5	$	16.2	$	-	$	-	$	998.5	$	16.2
Preferred stock		-		-		-		-		-		-
Total equity securities		998.5		16.2		-		-		998.5		16.2
Debt securities:
U.S. Government obligations		626.0		5.9		242.9		8.1		868.9		14.0
Municipal bonds		404.5		2.5		358.4		12.3		762.9		14.8
Foreign government obligations		408.2		4.9		76.0		2.8		484.2		7.7
U.S. corporate bonds		399.3		5.0		206.3		3.2		605.6		8.2
Foreign corporate bonds		236.6		1.6		117.3		1.8		353.9		3.4
Mortgage and asset-backed securities:
RMBS		429.7		4.7		132.8		2.7		562.5		7.4
CMBS		24.8		0.2		41.8		2.1		66.6		2.3
Other asset-backed securities		232.5		0.7		90.8		1.0		323.3		1.7
Total debt securities		2,761.6		25.5		1,266.3		34.0		4,027.9		59.5
Total temporarily impaired securities	$	3,760.1	$	41.7	$	1,266.3	$	34.0	$	5,026.4	$	75.7
	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, 2016
Equity securities:
Common stock	$	619.4	$	39.2	$	-	$	-	$	619.4	$	39.2
Preferred stock		-		-		-		-		-		-
Total equity securities		619.4		39.2		-		-		619.4		39.2
Debt securities:
U.S. Government obligations		975.0		24.6		-		-		975.0		24.6
Municipal bonds		1,464.5		39.7		41.6		2.4		1,506.1		42.1
Foreign government obligations		238.3		4.0		-		-		238.3		4.0
U.S. corporate bonds		727.9		18.1		52.6		1.2		780.5		19.3
Foreign corporate bonds		331.0		6.6		4.1		0.2		335.1		6.8
Mortgage and asset-backed securities:
RMBS		652.0		11.4		43.4		1.1		695.4		12.5
CMBS		148.9		1.4		117.7		2.2		266.6		3.6
Other asset-backed securities		334.7		1.6		550.4		10.1		885.1		11.7
Total debt securities		4,872.3		107.4		809.8		17.2		5,682.1		124.6
Total temporarily impaired securities	$	5,491.7	$	146.6	$	809.8	$	17.2	$	6,301.5	$	163.8

As of September 30, 2017, Alleghany held a total of 1,111 debt and equity securities that were in an unrealized loss position, of which 363, all debt securities, were in an unrealized loss position continuously for 12 months or more. The unrealized losses

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associated with these debt securities consisted primarily of losses related primarily to municipal bonds and U.S. Government obligations.

As of September 30, 2017, the vast majority of Alleghany’s debt securities were rated investment grade, with 7.3 percent of debt securities having issuer credit ratings that were below investment grade or not rated, compared with 5.1 percent as of December 31, 2016.

(g) 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 September 30, 2017, Alleghany’s carrying value in the Pillar Investments, as determined under the equity method of accounting, was $216.7 million, which is net of returns of capital received from the Pillar Investments.

In July 2013, AIHL invested $250.0 million in Ares Management LLC (“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 to limited partner interests in certain Ares subsidiaries that are convertible into an aggregate 5.9 percent interest in Ares common units. These interests may be converted at any time at Alleghany’s discretion. Until Alleghany determines to convert its limited partner interests into Ares common units, Alleghany classifies its investment in Ares as a component of other invested assets and accounts for its investment using the equity method of accounting. As of September 30, 2017, AIHL’s carrying value in Ares was $213.9 million, which is net of returns of capital received from Ares.

(h) Investments in Commercial Mortgage Loans

As of September 30, 2017, the carrying value of Alleghany’s commercial mortgage loan portfolio was $649.7 million, representing the unpaid principal balance on the loans. As of September 30, 2017, 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.

As discussed in Note 5(d) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2016 Form 10-K, RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program 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, 2017. Both programs were renewed on May 1, 2017 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 nine months ended September 30, 2017 and 2016:

	Nine Months Ended September 30,
	2017		2016
	($ in millions)
Reserves as of January 1	$	11,087.2	$	10,799.2
Less: reinsurance recoverables(1)		1,236.2		1,169.3
Net reserves as of January 1		9,851.0		9,629.9
Other adjustments		(0.7)		3.2
Incurred loss and LAE, net of reinsurance, related to:
Current year		3,099.0		2,460.2
Prior years		(173.0)		(261.7)
Total incurred loss and LAE, net of reinsurance		2,926.0		2,198.5
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		390.6		206.0
Prior years		1,743.2		1,702.7
Total paid loss and LAE, net of reinsurance		2,133.8		1,908.7
Foreign exchange effect		120.5		(22.6)
Net reserves as of September 30		10,763.0		9,900.3
Reinsurance recoverables as of September 30(1)		1,693.4		1,157.8
Reserves as of September 30	$	12,456.4	$	11,058.1

(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 September 30, 2017 increased from December 31, 2016, primarily reflecting significant catastrophe losses. Catastrophe losses, net of reinsurance, in the third quarter and first nine months of 2017 included $264.6 million related to Hurricane Harvey in August 2017, $312.0 million related to Hurricane Irma in September 2017, and $170.3 million related to Hurricane Maria in September 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 nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	(7.8)	(1)	$	(1.2)	(2)	$	(12.2)	(1)	$	(9.0)	(2)
Non-catastrophe		(0.3)			(9.6)	(3)		(50.4)	(4)		(70.3)	(3)
Total property		(8.1)			(10.8)			(62.6)			(79.3)
Casualty & other:
Malpractice Treaties(5)		-			(2.0)			(2.0)			(10.8)
Ogden rate impact(6)		-			-			24.4			-
Other		(41.7)	(7)		(56.2)	(8)		(100.6)	(9)		(127.9)	(8)
Total casualty & other		(41.7)			(58.2)			(78.2)			(138.7)
Total Reinsurance Segment		(49.8)			(69.0)			(140.8)			(218.0)
Insurance Segment
RSUI:
Casualty		(6.9)	(10)		(11.9)	(11)		(28.5)	(10)		(32.1)	(11)
Property and other		(1.7)	(12)		(4.6)	(13)		1.2	(14)		(8.4)	(13)
Total RSUI		(8.6)			(16.5)			(27.3)			(40.5)
CapSpecialty:
Asbestos-related illness and environmental impairment  liability		-			-			-			(2.0)
Other		(2.3)	(15)		(0.9)	(16)		(3.1)	(15)		(1.2)	(16)
Total CapSpecialty		(2.3)			(0.9)			(3.1)			(3.2)
PacificComp		(0.8)	(17)		-			(1.8)	(17)		-
Total incurred related to prior years	$	(61.5)		$	(86.4)		$	(173.0)		$	(261.7)

(1) Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2016 accident years.

(2) Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2015 accident years.

(3) Reflects favorable prior accident year loss reserve development primarily related to the 2014 through 2015 accident years.

(4) Reflects favorable prior accident year loss reserve development primarily related to the 2013 through 2016 accident years.

(5) 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.

(6) Represents unfavorable prior accident year loss reserve development arising from the U.K. Ministry of Justice’s decision to significantly reduce 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. As of March 20, 2017, the Ogden rate changed from 2.50 percent to negative 0.75 percent.

(7) Primarily reflects favorable prior accident year loss reserve development in longer-tailed U.S. professional liability lines of business related to older accident years and shorter-tailed casualty lines of business in the U.K. related to recent accident years.

(8) Generally reflects favorable prior accident year loss reserve development in a variety of casualty & other lines of business primarily related to the 2005, 2006 and 2008 through 2015 accident years.

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

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

(11) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess, general liability and professional liability lines of business related to the 2006 through 2012 accident years.

(12) Primarily reflects favorable unallocated LAE development.

(13) Primarily reflects favorable prior accident year loss reserve development in the non-catastrophe property lines of business in recent accident years.

(14) Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business primarily related to the 2015 and 2016 accident years, partially offset by favorable catastrophe prior accident year loss reserve development related to the 2016 accident year.

(15) Primarily reflects favorable prior accident year loss reserve development in the casualty lines of business related to the 2010, 2014, 2015 and 2016 accident years.

(16) Primarily reflects favorable prior accident year loss reserve development in the surety lines of business related to the 2015 accident year.

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

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6. Income Taxes

The effective tax rate on earnings before income taxes for the first nine months of 2017 was 66.8 percent, compared with 29.3 percent for the first nine months of 2016. The 66.8 percent effective tax rate is calculated based on actual results through September 30, 2017 because management was not able to reliably estimate the annual effective tax rate in light of the recent catastrophe losses incurred. The effective tax rate in the first nine months of 2017 compared with the first nine months of 2016 primarily reflects income tax benefits from taxable losses arising from Hurricanes Harvey, Irma and Maria in the first nine months of 2017, and prior period income tax expense adjustments in the first nine months of 2016, which include $16.1 million of out-of-period reductions to current and deferred TransRe tax assets recorded in the first nine months of 2016 that related primarily to periods prior to Alleghany’s merger with TransRe in 2012.

Alleghany believes that, as of September 30, 2017, it had no material uncertain tax positions. Interest and penalties relating 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 September 30, 2017.

7. Stockholders’ Equity

(a) Common Stock Repurchases

In July 2014, 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 $350.0 million (the “2014 Repurchase Program”). In November 2015, the Alleghany Board of Directors authorized the repurchase, upon the completion of the 2014 Repurchase Program, 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 (the “2015 Repurchase Program”). In the first quarter of 2016, Alleghany completed the 2014 Repurchase Program and subsequent repurchases have been made pursuant to the 2015 Repurchase Program. As of September 30, 2017, Alleghany had $370.7 million remaining under its share repurchase authorization.

The following table presents the shares of Common Stock that Alleghany repurchased in the three and nine months ended September 30, 2017 and 2016 pursuant to the 2014 Repurchase Program and the 2015 Repurchase Program, as applicable:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Shares repurchased		15,916		4,621		15,916		117,721
Cost of shares repurchased (in millions)	$	8.5	$	2.4	$	8.5	$	55.7
Average price per share repurchased	$	537.14	$	517.40	$	537.14	$	472.97

(b) Accumulated Other Comprehensive Income

The following tables present a reconciliation of the changes during the nine months ended September 30, 2017 and 2016 in accumulated other comprehensive income attributable to Alleghany stockholders:

	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
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		364.6		22.4		(0.2)		386.8
Reclassifications from accumulated other comprehensive income		(57.7)		-		-		(57.7)
Total		306.9		22.4		(0.2)		329.1
Balance as of September 30, 2017	$	539.1	$	(88.8)	$	(11.9)	$	438.4

	Unrealized Appreciation of Investments		Unrealized Currency Translation Adjustment		Retirement Plans		Total
	($ in millions)
Balance as of January 1, 2016	$	231.9	$	(104.0)	$	(11.6)	$	116.3
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		238.4		19.2		0.4		258.0
Reclassifications from accumulated other comprehensive income		(42.7)		-		-		(42.7)
Total		195.7		19.2		0.4		215.3
Balance as of September 30, 2016	$	427.6	$	(84.8)	$	(11.2)	$	331.6

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The following table presents reclassifications out of accumulated other comprehensive income attributable to Alleghany stockholders during the three and nine months ended September 30, 2017 and 2016:

Accumulated Other Comprehensive Income Component		Three Months Ended September 30,				Nine Months Ended September 30,
	Line in Consolidated Statement of  Earnings	2017		2016		2017		2016
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(32.9)	$	(27.2)	$	(101.8)	$	(103.9)
	Other than temporary impairment losses		6.1		11.7		13.1		38.2
	Income taxes		9.4		5.4		31.0		23.0
Total reclassifications:	Net earnings	$	(17.4)	$	(10.1)	$	(57.7)	$	(42.7)

(1) Net realized capital gains for the nine months ended September 30, 2016 exclude the Jazwares Remeasurement Gain of $13.2 million.

8. Earnings Per Share of Common Stock

The following is a reconciliation of the earnings and share data used in the basic and diluted (losses) earnings per share computations for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions, except share amounts)
Net (losses) earnings available to Alleghany stockholders	$	(314.2)	$	155.8	$	(63.2)	$	387.4
Effect of dilutive securities		(8.9)		-		-		-
(Losses) Income available to common stockholders for diluted earnings per share	$	(323.1)	$	155.8	$	(63.2)	$	387.4
Weighted average common shares outstanding applicable to basic earnings  per share		15,416,014		15,438,399		15,416,249		15,443,150
Effect of dilutive securities		42,310		-		-		6,330
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		15,458,324		15,438,399		15,416,249		15,449,480

63,567 and 70,881 contingently issuable shares were potentially available during the first nine months of 2017 and 2016, 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.

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(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 2016 Form 10-K.

(c) Energy Holdings

As of September 30, 2017, Alleghany had holdings in energy sector businesses of $519.3 million, comprised of $319.4 million of debt securities, $50.7 million of equity securities and $149.2 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 businesses. As such, Alleghany classifies its business into two reportable segments – reinsurance and insurance. Other activities include Alleghany Capital and corporate activities. In addition, reinsurance and insurance underwriting activities are evaluated separately from investment and other activities. Net realized capital gains and OTTI losses are not considered relevant in evaluating investment performance on an annual basis. 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 2016 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. Over one-third 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 PacificComp. RSUI also writes a modest amount of assumed reinsurance business, which is included in the insurance segment.

The components of other activities are Alleghany Capital and corporate activities. Alleghany Capital consists of manufacturing and service operations, oil and gas operations and corporate operations and investments at the Alleghany Capital level. Manufacturing and service operations are conducted through Bourn & Koch, Kentucky Trailer, IPS, Jazwares, W&W|AFCO Steel, beginning April 28, 2017, and Alleghany Capital’s investment in Wilbert, beginning August 1, 2017. Oil and gas operations are conducted through SORC.

On August 1, 2017, Alleghany Capital acquired a 45 percent equity interest in Wilbert for $72.3 million.

On April 28, 2017, Alleghany Capital acquired approximately 80 percent of the equity in W&W|AFCO Steel for $164.5 million, including $163.9 million in cash paid on May 1, 2017 and $0.6 million of estimated purchase price adjustments. In connection with the acquisition, Alleghany recorded $39.9 million, $25.3 million and $70.0 million of goodwill, indefinite-lived intangible assets and finite-lived intangible assets, respectively. Indefinite-lived intangible assets relate to trade name and finite-lived intangible assets relate to customer relationships. The customer relationship asset is estimated to have a useful life of ten years.

On April 15, 2016, Alleghany Capital acquired an additional 50 percent of Jazwares’ outstanding equity, bringing its equity ownership interest to 80 percent and, as of that date, the results of Jazwares have been included in Alleghany’s consolidated results. Prior to April 15, 2016, Jazwares was accounted for under the equity method of accounting.

The primary components of corporate activities are Alleghany Properties and other 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 2016 Form 10-K.

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(b) Results

The following tables present the results for Alleghany’s two reportable segments and for other activities for the three and nine months ended September 30, 2017 and 2016:

	Reinsurance Segment						Insurance Segment										Other Activities
Three Months ended September 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	445.5	$	681.1	$	1,126.6	$	234.6	$	74.3	$	41.6	$	350.5	$	1,477.1	$	-	$	(5.3)	$	1,471.8
Net premiums written		329.0		649.5		978.5		170.8		69.5		41.5		281.8		1,260.3		-		-		1,260.3
Net premiums earned		310.8		642.4		953.2		179.0		66.1		41.4		286.5		1,239.7		-		-		1,239.7
Net loss and LAE		659.9		459.3		1,119.2		305.4		37.0		30.3		372.7		1,491.9		-		-		1,491.9
Commissions, brokerage and other underwriting expenses		105.2		203.7		308.9		50.3		28.4		10.6		89.3		398.2		-		-		398.2
Underwriting (loss) profit (3)	$	(454.3)	$	(20.6)	$	(474.9)	$	(176.7)	$	0.7	$	0.5	$	(175.5)		(650.4)		-		-		(650.4)
Net investment income																101.4		1.6		1.7		104.7
Net realized capital gains																21.5		0.7		10.7		32.9
Other than temporary impairment losses																(6.1)		-		-		(6.1)
Other revenue																4.7		291.7		(0.1)		296.3
Other operating expenses																8.3		269.1		0.5		277.9
Corporate administration																(1.5)		-		(3.2)		(4.7)
Amortization of intangible assets																(0.3)		6.0		-		5.7
Interest expense																6.6		1.2		13.0		20.8
(Losses) earnings before income taxes															$	(542.0)	$	17.7	$	2.0	$	(522.3)
	Reinsurance Segment						Insurance Segment										Other Activities
Three Months ended September 30, 2016	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	400.2	$	665.2	$	1,065.4	$	243.7	$	68.5	$	37.8	$	350.0	$	1,415.4	$	-	$	(7.5)	$	1,407.9
Net premiums written		320.5		646.4		966.9		168.3		64.4		37.1		269.8		1,236.7		-		-		1,236.7
Net premiums earned		314.6		654.8		969.4		186.8		61.6		35.7		284.1		1,253.5		-		-		1,253.5
Net loss and LAE		157.6		404.6		562.2		94.8		34.5		27.1		156.4		718.6		-		-		718.6
Commissions, brokerage and other underwriting expenses		105.4		227.7		333.1		53.9		26.4		9.6		89.9		423.0		-		-		423.0
Underwriting profit (loss) (3)	$	51.6	$	22.5	$	74.1	$	38.1	$	0.7	$	(1.0)	$	37.8		111.9		-		-		111.9
Net investment income																118.7		-		1.9		120.6
Net realized capital gains																27.1		0.1		-		27.2
Other than temporary impairment losses																(11.7)		-		-		(11.7)
Other revenue																0.3		218.6		6.1		225.0
Other operating expenses																23.6		203.6		1.2		228.4
Corporate administration																0.3		-		10.4		10.7
Amortization of intangible assets																(0.7)		6.7		-		6.0
Interest expense																6.8		0.6		13.3		20.7
Earnings (losses) before income taxes															$	216.3	$	7.8	$	(16.9)	$	207.2
	Reinsurance Segment						Insurance Segment										Other Activities
Nine Months ended September 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	1,190.0	$	2,037.7	$	3,227.7	$	794.1	$	213.2	$	124.2	$	1,131.5	$	4,359.2	$	-	$	(16.5)	$	4,342.7
Net premiums written		931.4		1,975.3		2,906.7		558.0		198.9		122.9		879.8		3,786.5		-		-		3,786.5
Net premiums earned		868.1		1,968.7		2,836.8		540.3		192.2		123.5		856.0		3,692.8		-		-		3,692.8
Net loss and LAE		904.6		1,344.7		2,249.3		479.7		105.7		91.3		676.7		2,926.0		-		-		2,926.0
Commissions, brokerage and other underwriting expenses		283.7		662.9		946.6		158.3		83.3		32.2		273.8		1,220.4		-		-		1,220.4
Underwriting (loss) profit (3)	$	(320.2)	$	(38.9)	$	(359.1)	$	(97.7)	$	3.2	$	-	$	(94.5)		(453.6)		-		-		(453.6)
Net investment income																311.7		2.1		8.1		321.9
Net realized capital gains																90.8		0.9		10.1		101.8
Other than temporary impairment losses																(13.1)		-		-		(13.1)
Other revenue																10.5		634.3		5.6		650.4
Other operating expenses																57.4		618.2		2.6		678.2
Corporate administration																0.2		-		26.4		26.6
Amortization of intangible assets																(1.2)		15.4		-		14.2
Interest expense																20.2		3.0		39.5		62.7
(Losses) earnings before income taxes															$	(130.3)	$	0.7	$	(44.7)	$	(174.3)

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	Reinsurance Segment						Insurance Segment										Other Activities
Nine Months ended September 30, 2016	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	1,173.3	$	2,136.7	$	3,310.0	$	808.3	$	201.5	$	105.9	$	1,115.7	$	4,425.7	$	-	$	(19.0)	$	4,406.7
Net premiums written		945.1		2,088.3		3,033.4		566.3		189.0		104.5		859.8		3,893.2		-		-		3,893.2
Net premiums earned		857.9		2,030.6		2,888.5		567.4		175.8		104.9		848.1		3,736.6		-		-		3,736.6
Net loss and LAE		454.9		1,282.7		1,737.6		289.0		92.4		79.5		460.9		2,198.5		-		-		2,198.5
Commissions, brokerage and other underwriting expenses		275.6		693.6		969.2		161.9		78.7		28.9		269.5		1,238.7		-		-		1,238.7
Underwriting profit (loss) (3)	$	127.4	$	54.3	$	181.7	$	116.5	$	4.7	$	(3.5)	$	117.7		299.4		-		-		299.4
Net investment income																326.4		-		5.9		332.3
Net realized capital gains																107.6		13.0		(3.5)		117.1
Other than temporary impairment losses																(38.2)		-		-		(38.2)
Other revenue																3.8		517.3		6.7		527.8
Other operating expenses																65.1		508.0		2.4		575.5
Corporate administration																1.0		-		33.0		34.0
Amortization of intangible assets																(2.4)		16.9		-		14.5
Interest expense																20.6		1.2		39.6		61.4
Earnings (losses) before income taxes															$	614.7	$	4.2	$	(65.9)	$	553.0

(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, net realized capital gains, OTTI losses, other 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 segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes 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

As of September 30, 2017, the identifiable assets of the reinsurance segment, insurance segment and other activities were $16.9 billion, $7.0 billion and $1.8 billion, respectively, of which cash and invested assets represented $13.6 billion, $5.4 billion and $0.7 billion, respectively. As of September 30, 2017, Alleghany’s equity attributable to the reinsurance segment, insurance segment and other activities was $5.1 billion, $2.8 billion and $0.3 billion, respectively.

Included in other activities is debt associated with Alleghany Capital’s operating subsidiaries, which totaled $102.5 million as of September 30, 2017. The $102.5 million includes $31.2 million of borrowings by Jazwares under its available credit facility, $23.0 million of borrowings by W&W|AFCO Steel under its available credit facility and term loans, $17.0 million of debt at Kentucky Trailer related primarily to a mortgage loan, borrowings to finance small acquisitions and borrowings under its available credit facility, $15.9 million of borrowings by IPS under its available credit facility and $15.4 million of term loans at Bourn & Koch related to borrowings to finance an acquisition. None of these liabilities are guaranteed by Alleghany or Alleghany Capital.

11. Credit Agreement

On July 31, 2017, Alleghany entered into a five-year credit agreement (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 Alleghany’s 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 July 31, 2017 through September 30, 2017.

The Credit Agreement replaced Alleghany’s previous four-year credit agreement (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.

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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 nine months ended September 30, 2017 and 2016. 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 September 30, 2017, 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, 2016, or the “2016 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 wholly-owned subsidiary Pacific Compensation Corporation and its subsidiary;

• “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 2016 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 2016 Form 10-K for additional information.

25

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 Adjusted EBITDA, 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) net realized capital gains; (iii) other than temporary impairment, or “OTTI,” losses; (iv) other revenue; (v) other operating expenses; (vi) corporate administration; (vii) amortization of intangible assets; and (viii) interest expense. We consistently use underwriting profit as a supplement to earnings before income taxes, the most comparable GAAP financial measure, to evaluate the performance of our segments and believe that underwriting profit provides useful additional information to investors because it highlights net earnings attributable to a segment’s 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.”

Adjusted EBITDA is a non-GAAP financial measure for our non-insurance operating subsidiaries and investments held by Alleghany Capital. Adjusted EBITDA represents other revenue less certain other expenses and does not include: (i) depreciation expense (a component of other operating expenses); (ii) amortization of intangible assets; (iii) interest expense; (iv) net realized capital gains; (v) OTTI losses; and (vi) income taxes. Because Adjusted EBITDA excludes interest, income taxes, net realized capital gains, OTTI losses, depreciation and amortization, it provides an indication of economic performance that is not affected by levels of debt, interest rates, effective tax rates or levels of depreciation and amortization resulting from acquisition accounting. We use Adjusted EBITDA as a supplement to earnings before income taxes, the most comparable GAAP financial measure, to evaluate the performance of certain of our non-insurance operating subsidiaries and investments. A reconciliation of Adjusted EBITDA to earnings before income taxes is presented within “Consolidated Results of Operations.”

26

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 losses attributable to Alleghany stockholders were $314.2 million in the third quarter of 2017, compared with net earnings attributable to Alleghany stockholders of $155.8 million in the third quarter of 2016, and net losses attributable to Alleghany stockholders were $63.2 million in the first nine months of 2017, compared with net earnings attributable to Alleghany stockholders of $387.4 million in the first nine months of 2016.

• Losses before income taxes were $522.3 million in the third quarter of 2017, compared with earnings before income taxes of $207.2 million in the third quarter of 2016, and losses before income taxes were $174.3 million in the first nine months of 2017, compared with net earnings before income taxes of $553.0 million in the first nine months of 2016.

• Net investment income decreased by 13.2 percent and 3.1 percent in the third quarter and first nine months of 2017, respectively, from the corresponding 2016 periods.

• Net premiums written increased by 1.9 percent and decreased by 2.7 percent in the third quarter and first nine months of 2017, respectively, from the corresponding 2016 periods.

• Underwriting loss was $650.4 million in the third quarter of 2017, compared with underwriting profit of $111.9 million in the third quarter of 2016, and underwriting loss was $453.6 million in the first nine months of 2017, compared with underwriting profit of $299.4 million in the first nine months of 2016.

• The combined ratio for our reinsurance and insurance segments was 152.4 percent in the third quarter of 2017, compared with 91.0 percent in the third quarter of 2016, and 112.2 percent in the first nine months of 2017, compared with 92.0 percent in the first nine months of 2016.

• Catastrophe losses, net of reinsurance, were $792.5 million in the third quarter of 2017, compared with $32.1 million in the third quarter of 2016, and $807.9 million in the first nine months of 2017, compared with $160.0 million in the first nine months of 2016.

• Net favorable prior accident year loss reserve development was $61.5 million in the third quarter of 2017, compared with $86.4 million in the third quarter of 2016, and $173.0 million in the first nine months of 2017, compared with $261.7 million in the first nine months of 2016.

• Sales revenues for Alleghany Capital were $291.7 million in the third quarter of 2017, compared with $218.6 million in the third quarter of 2016, and $634.3 million in the first nine months of 2017, compared with $517.3 million in the first nine months of 2016.

• Earnings before income taxes for Alleghany Capital were $17.7 million in the third quarter of 2017, compared with $7.8 million in the third quarter of 2016, and earnings before income taxes were $0.7 million in the first nine months of 2017, compared with $4.2 million in the first nine months of 2016. Adjusted EBITDA was $31.3 million in the third quarter of 2017, compared with $20.3 million in the third quarter of 2016, and $35.8 million in the first nine months of 2017, compared with $24.9 million in the first nine months of 2016.

As of September 30, 2017, we had total assets of $25.7 billion and total stockholders’ equity attributable to Alleghany stockholders of $8.2 billion. As of September 30, 2017, we had consolidated total investments of approximately $19.0 billion, consisting of $13.2 billion invested in debt securities, $3.8 billion invested in equity securities, $0.6 billion invested in short-term investments, $0.7 billion invested in commercial mortgage loans and $0.7 billion invested in other invested assets.

We incurred significant catastrophe losses in the third quarter of 2017, primarily arising from three major hurricanes. Hurricane Harvey caused widespread property damage and flooding in August 2017, primarily in the State of Texas. Hurricane Irma caused widespread property damage and flooding in September 2017, primarily in the State of Florida. Hurricane Maria caused widespread property damage and flooding in September 2017, primarily in the Commonwealth of Puerto Rico. Our loss estimates for these catastrophes are based on an analysis of reported claims, an underwriting review of in-force contracts, estimates of losses resulting from wind and other perils, including storm surge and flooding to the extent covered by applicable policies, and other factors requiring considerable judgment. The ultimate amount of our actual losses from these catastrophes may be materially different from these estimates due to the size and complexity of the events and the preliminary nature of the information available to prepare the estimates.

27

The following table presents the impact of our catastrophe losses, net of reinsurance, for the 2017 third quarter:

Three Months Ended September 30, 2017	Reinsurance Segment			Insurance Segment			Total Segments
	($ in millions)
Net loss and LAE:
Hurricane Harvey		$    181.0			$     83.6	(1)		$    264.6
Hurricane Irma		208.3			103.7	(2)		312.0
Hurricane Maria		156.0			14.3	(2)		170.3
Other		30.7	(3)		14.9			45.6
Total net loss and LAE		576.0			216.5			792.5
Net reinstatement premiums (earned) (4)		(37.1)			-			(37.1)
Losses before income taxes		538.9			216.5			755.4
Income taxes		188.6			75.8			264.4
Net losses attributables to Alleghany stockholders		$    350.3			$    140.7			$    491.0

(1) Includes $83.3 million attributable to RSUI and $0.3 million attributable to CapSpecialty.

(2) All attributable to RSUI.

(3) Attributable to earthquakes in Mexico.

(4) Represents an increase to net premiums earned.

Our catastrophe losses are more fully described in the following pages.

Consolidated Results of Operations

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions)
Revenues
Net premiums earned		$    1,239.7		$  1,253.5		$  3,692.8		$  3,736.6
Net investment income		104.7		120.6		321.9		332.3
Net realized capital gains		32.9		27.2		101.8		117.1
Other than temporary impairment losses		(6.1)		(11.7)		(13.1)		(38.2)
Other revenue		296.3		225.0		650.4		527.8
Total revenues		1,667.5		1,614.6		4,753.8		4,675.6
Costs and Expenses
Net loss and loss adjustment expenses		1,491.9		718.6		2,926.0		2,198.5
Commissions, brokerage and other underwriting expenses		398.2		423.0		1,220.4		1,238.7
Other operating expenses		277.9		228.4		678.2		575.5
Corporate administration		(4.7)		10.7		26.6		34.0
Amortization of intangible assets		5.7		6.0		14.2		14.5
Interest expense		20.8		20.7		62.7		61.4
Total costs and expenses		2,189.8		1,407.4		4,928.1		4,122.6
(Losses) earnings before income taxes		(522.3)		207.2		(174.3)		553.0
Income taxes		(212.3)		48.4		(116.3)		162.3
Net (losses) earnings		(310.0)		158.8		(58.0)		390.7
Net earnings attributable to noncontrolling interest		4.2		3.0		5.2		3.3
Net (losses) earnings attributable to Alleghany stockholders		$     (314.2)		$     155.8		$     (63.2)		$     387.4

28

Alleghany’s segments are reported in a manner consistent with the way management evaluates the businesses. As such, we classify our businesses into two reportable segments – reinsurance and insurance. Other activities include Alleghany Capital and corporate activities. 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 nine months ended September 30, 2017 and 2016.

	Segments						Other Activities
Three Months Ended September 30, 2017	Reinsurance Segment		Insurance Segment		Total Segments		Alleghany Capital		Corporate Activities(1)		Consolidated
	($ in millions)
Gross premiums written	$	1,126.6	$	350.5	$	1,477.1	$	-	$	(5.3)	$	1,471.8
Net premiums written		978.5		281.8		1,260.3		-		-		1,260.3
Net premiums earned		953.2		286.5		1,239.7		-		-		1,239.7
Net loss and LAE:
Current year (excluding catastrophe losses)		593.0		167.9		760.9		-		-		760.9
Current year catastrophe losses		576.0		216.5		792.5		-		-		792.5
Prior years		(49.8)		(11.7)		(61.5)		-		-		(61.5)
Total net loss and LAE		1,119.2		372.7		1,491.9		-		-		1,491.9
Commissions, brokerage and other underwriting expenses		308.9		89.3		398.2		-		-		398.2
Underwriting (loss)(2)	$	(474.9)	$	(175.5)		(650.4)		-		-		(650.4)
Net investment income						101.4		1.6		1.7		104.7
Net realized capital gains						21.5		0.7		10.7		32.9
Other than temporary impairment losses						(6.1)		-		-		(6.1)
Other revenue						4.7		291.7		(0.1)		296.3
Other operating expenses						8.3		269.1		0.5		277.9
Corporate administration						(1.5)		-		(3.2)		(4.7)
Amortization of intangible assets						(0.3)		6.0		-		5.7
Interest expense						6.6		1.2		13.0		20.8
Earnings (losses) before income taxes					$	(542.0)	$	17.7	$	2.0	$	(522.3)
Loss ratio(3):
Current year (excluding catastrophe losses)		62.3%		58.6%		61.4%
Current year catastrophe losses		60.4%		75.6%		63.9%
Prior years		(5.2%)		(4.1%)		(5.0%)
Total net loss and LAE		117.5%		130.1%		120.3%
Expense ratio(4)		32.3%		31.2%		32.1%
Combined ratio(5)		149.8%		161.3%		152.4%

29

	Segments						Other Activities
Three Months Ended September 30, 2016	Reinsurance Segment		Insurance Segment		Total Segments		Alleghany Capital		Corporate Activities(1)		Consolidated
	($ in millions)
Gross premiums written	$	1,065.4	$	350.0	$	1,415.4	$	-	$	(7.5)	$	1,407.9
Net premiums written		966.9		269.8		1,236.7		-		-		1,236.7
Net premiums earned		969.4		284.1		1,253.5		-		-		1,253.5
Net loss and LAE:
Current year (excluding catastrophe losses)		609.6		163.3		772.9		-		-		772.9
Current year catastrophe losses		21.6		10.5		32.1		-		-		32.1
Prior years		(69.0)		(17.4)		(86.4)		-		-		(86.4)
Total net loss and LAE		562.2		156.4		718.6		-		-		718.6
Commissions, brokerage and other underwriting expenses		333.1		89.9		423.0		-		-		423.0
Underwriting profit(2)	$	74.1	$	37.8		111.9		-		-		111.9
Net investment income						118.7		-		1.9		120.6
Net realized capital gains						27.1		0.1		-		27.2
Other than temporary impairment losses						(11.7)		-		-		(11.7)
Other revenue						0.3		218.6		6.1		225.0
Other operating expenses						23.6		203.6		1.2		228.4
Corporate administration						0.3		-		10.4		10.7
Amortization of intangible assets						(0.7)		6.7		-		6.0
Interest expense						6.8		0.6		13.3		20.7
Earnings (losses) before income taxes					$	216.3	$	7.8	$	(16.9)	$	207.2
Loss ratio(3):
Current year (excluding catastrophe losses)		62.8%		57.5%		61.7%
Current year catastrophe losses		2.2%		3.7%		2.6%
Prior years		(7.1%)		(6.1%)		(7.0%)
Total net loss and LAE		57.9%		55.1%		57.3%
Expense ratio(4)		34.4%		31.7%		33.7%
Combined ratio(5)		92.3%		86.8%		91.0%

30

	Segments						Other Activities
Nine Months Ended September 30, 2017	Reinsurance Segment		Insurance Segment		Total Segments		Alleghany Capital		Corporate Activities(1)		Consolidated
	($ in millions)
Gross premiums written	$	3,227.7	$	1,131.5	$	4,359.2	$	-	$	(16.5)	$	4,342.7
Net premiums written		2,906.7		879.8		3,786.5		-		-		3,786.5
Net premiums earned		2,836.8		856.0		3,692.8		-		-		3,692.8
Net loss and LAE:
Current year (excluding catastrophe losses)		1,814.1		477.0		2,291.1		-		-		2,291.1
Current year catastrophe losses		576.0		231.9		807.9		-		-		807.9
Prior years		(140.8)		(32.2)		(173.0)		-		-		(173.0)
Total net loss and LAE		2,249.3		676.7		2,926.0		-		-		2,926.0
Commissions, brokerage and other underwriting expenses		946.6		273.8		1,220.4		-		-		1,220.4
Underwriting (loss)(2)	$	(359.1)	$	(94.5)		(453.6)		-		-		(453.6)
Net investment income						311.7		2.1		8.1		321.9
Net realized capital gains						90.8		0.9		10.1		101.8
Other than temporary impairment losses						(13.1)		-		-		(13.1)
Other revenue						10.5		634.3		5.6		650.4
Other operating expenses						57.4		618.2		2.6		678.2
Corporate administration						0.2		-		26.4		26.6
Amortization of intangible assets						(1.2)		15.4		-		14.2
Interest expense						20.2		3.0		39.5		62.7
Earnings (losses) before income taxes					$	(130.3)	$	0.7	$	(44.7)	$	(174.3)
Loss ratio(3):
Current year (excluding catastrophe losses)		63.9%		55.8%		62.0%
Current year catastrophe losses		20.3%		27.1%		21.9%
Prior years		(5.0%)		(3.8%)		(4.7%)
Total net loss and LAE		79.2%		79.1%		79.2%
Expense ratio(4)		33.4%		32.0%		33.0%
Combined ratio(5)		112.6%		111.1%		112.2%

31

	Segments						Other Activities
Nine Months Ended September 30, 2016	Reinsurance Segment		Insurance Segment		Total Segments		Alleghany Capital		Corporate Activities(1)		Consolidated
	($ in millions)
Gross premiums written	$	3,310.0	$	1,115.7	$	4,425.7	$	-	$	(19.0)	$	4,406.7
Net premiums written		3,033.4		859.8		3,893.2		-		-		3,893.2
Net premiums earned		2,888.5		848.1		3,736.6		-		-		3,736.6
Net loss and LAE:
Current year (excluding catastrophe losses)		1,838.2		462.0		2,300.2		-		-		2,300.2
Current year catastrophe losses		117.4		42.6		160.0		-		-		160.0
Prior years		(218.0)		(43.7)		(261.7)		-		-		(261.7)
Total net loss and LAE		1,737.6		460.9		2,198.5		-		-		2,198.5
Commissions, brokerage and other underwriting expenses		969.2		269.5		1,238.7		-		-		1,238.7
Underwriting profit(2)	$	181.7	$	117.7		299.4		-		-		299.4
Net investment income						326.4		-		5.9		332.3
Net realized capital gains						107.6		13.0		(3.5)		117.1
Other than temporary impairment losses						(38.2)		-		-		(38.2)
Other revenue						3.8		517.3		6.7		527.8
Other operating expenses						65.1		508.0		2.4		575.5
Corporate administration						1.0		-		33.0		34.0
Amortization of intangible assets						(2.4)		16.9		-		14.5
Interest expense						20.6		1.2		39.6		61.4
Earnings (losses) before income taxes					$	614.7	$	4.2	$	(65.9)	$	553.0
Loss ratio(3):
Current year (excluding catastrophe losses)		63.6%		54.5%		61.6%
Current year catastrophe losses		4.1%		5.0%		4.3%
Prior years		(7.4%)		(5.2%)		(7.1%)
Total net loss and LAE		60.3%		54.3%		58.8%
Expense ratio(4)		33.6%		31.8%		33.2%
Combined ratio(5)		93.9%		86.1%		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, net realized capital gains, OTTI losses, other 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.

32

Comparison of the Three and Nine Months Ended September 30, 2017 and 2016

Premiums. The following table presents our consolidated premiums:

	Three Months Ended September 30,							Nine Months Ended September 30,
	2017		2016		Percent Change			2017		2016		Percent Change
	($ in millions)
Premiums written:
Gross premiums written	$	1,471.8	$	1,407.9		4.5	%	$	4,342.7	$	4,406.7		(1.5	%)
Net premiums written		1,260.3		1,236.7		1.9	%		3,786.5		3,893.2		(2.7	%)
Net premiums earned		1,239.7		1,253.5		(1.1	%)		3,692.8		3,736.6		(1.2	%)

The increases in gross and net premiums written in the third quarter of 2017 from the third quarter of 2016 are mainly attributable to increases at our reinsurance segment, primarily reflecting reinstatement premiums written related to the significant catastrophe losses that occurred in the third quarter of 2017. The increase in net premiums written in the third quarter of 2017 from the third quarter of 2016 is also due to an increase at our insurance segment, reflecting growth at PacificComp, CapSpecialty and, to a lesser extent, RSUI.

The decreases in gross and net premiums written in the first nine months of 2017 from the first nine months of 2016 are mainly attributable to decreases at our reinsurance segment, primarily related to cancellations, non-renewals and reduced participations in certain international treaties, the impact of rate pressures and increased retentions by cedants and, to a lesser extent, the impact of changes in foreign currency exchange rates, partially offset by gross and net premiums written in the third quarter of 2017 related to reinstatement premiums written. The decrease at our reinsurance segment in gross and net premiums written in the first nine months of 2017 from the first nine months of 2016 also reflects lower premiums related to a large whole account quota share treaty, or the “Quota Share Treaty.” Premiums related to the Quota Share Treaty were $205.8 million and $199.4 million in the third quarter of 2017 and 2016, respectively, and $579.9 million and $624.2 million in the first nine months of 2017 and 2016, respectively. Premiums related to the Quota Share Treaty in the first nine months of 2016 reflect elevated premiums written in the first quarter of 2016 due to differences between initial premium estimates at contract inception, which were recorded in the fourth quarter of 2015, and actual data subsequently reported. As a consequence of this change in estimate, premiums written in the fourth quarter of 2015 were understated and premiums written in the first quarter of 2016 were correspondingly increased. In general, when actual data has not been reported by ceding companies, premiums written are estimated based on historical patterns and other relevant factors. Any differences between these estimates and actual data subsequently reported are recorded in the period when actual data becomes available.

The decreases in net premiums earned in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect decreases at our reinsurance segment due mainly to a decrease in net premiums written in recent quarters.

A comparison of premiums by segment for the third quarter and first nine months of 2017 and 2016 is more fully described in the following pages.

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

	Three Months Ended September 30,							Nine Months Ended September 30,
	2017		2016		Percent Change			2017		2016		Percent Change
	($ in millions)
Net loss and LAE:
Current year (excluding catastrophe losses)	$	760.9	$	772.9		(1.6	%)	$	2,291.1	$	2,300.2		(0.4%)
Current year catastrophe losses		792.5		32.1		2,368.8	%		807.9		160.0		404.9%
Prior years		(61.5)		(86.4)		(28.8	%)		(173.0)		(261.7)		(33.9%)
Total net loss and LAE	$	1,491.9	$	718.6		107.6	%	$	2,926.0	$	2,198.5		33.1%
Loss ratio:
Current year (excluding catastrophe losses)		61.4%		61.7%					62.0%		61.6%
Current year catastrophe losses		63.9%		2.6%					21.9%		4.3%
Prior years		(5.0%)		(7.0%)					(4.7%)		(7.1%)
Total net loss and LAE		120.3%		57.3%					79.2%		58.8%

33

The increases in net loss and LAE in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect significant increases in catastrophe losses at our reinsurance and insurance segments. The catastrophe losses in the third quarter and first nine months of 2017 include $264.6 million related to Hurricane Harvey, $312.0 million related to Hurricane Irma and $170.3 million related to Hurricane Maria.

The catastrophe losses in the third quarter of 2016 related primarily to typhoons and floods in China and flooding and severe weather primarily in the State of Louisiana. In addition to the losses in the third quarter of 2016, the catastrophe losses in the first nine months of 2016 included wildfire losses in Alberta, Canada and earthquake losses in Japan and Ecuador.

Net loss and LAE in the first nine months of 2017 for the reinsurance segment includes $24.4 million of unfavorable prior accident year loss reserve development arising from the U.K. Ministry of Justice’s decision to significantly reduce 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 comparison of net loss and LAE by segment for the third quarter and first nine months of 2017 and 2016 is more fully described 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 September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
Commissions, brokerage and other underwriting expenses		$    398.2		$    423.0		(5.9%)		$    1,220.4		$    1,238.7		(1.5%)
Expense ratio		32.1%		33.7%				33.0%		33.2%
The decreases in commissions, brokerage and other underwriting expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods reflect the impact of lower net premiums earned and the impact of losses arising from Hurricanes Harvey, Irma and Maria on short-term incentive compensation expense accruals at our reinsurance segment and RSUI. A comparison of commissions, brokerage and other underwriting expenses for the third quarter and first nine months of 2017 and 2016 is more fully described in the following pages. Underwriting profit. The following table presents our consolidated underwriting (loss) profit:
	Three Months Ended September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
Underwriting (loss) profit		$    (650.4)		$    111.9		(681.2%)		$    (453.6)		$    299.4		(251.5%)
Combined ratio		152.4%		91.0%				112.2%		92.0%
The underwriting losses in the third quarter and first nine months of 2017, compared with underwriting profits in the corresponding 2016 periods primarily reflect significant catastrophe losses from Hurricanes Harvey, Irma and Maria at our reinsurance and insurance segments, as discussed above. A comparison of underwriting profit for the third quarter and first nine months of 2017 and 2016 is more fully described in the following pages. Investment results. The following table presents our consolidated investment results:
	Three Months Ended September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
Net investment income		$    104.7		$    120.6		(13.2%)		$    321.9		$    332.3		(3.1%)
Net realized capital gains		32.9		27.2		21.0%		101.8		117.1		(13.1%)
Other than temporary impairment losses		(6.1)		(11.7)		(47.9%)		(13.1)		(38.2)		(65.7%)

34

The decreases in net investment income in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily relate to losses incurred on our equity interests in Pillar Capital Holdings Limited and related funds, or “Pillar Investments,” arising from significant catastrophe losses incurred in August and September 2017. The decrease in net investment income in the first nine months of 2017 also relates to a $12.6 million charge on our equity investment in Ares Management LLC, or “Ares.” The charge on our equity investment in Ares reflects 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. Ares expects to receive future management fees derived from the assets under management of the acquired entity.

The increase in net realized capital gains in the third quarter of 2017 from the third quarter of 2016 primarily reflects gains on the sale of certain exchange-traded funds in the third quarter of 2017 that exceeded gains for the equity and bond portfolio in the third quarter of 2016. The decrease in net realized capital gains in the first nine months of 2017 from the first nine months of 2016 primarily reflects lower gains for the equity and bond portfolio and a one-time $13.2 million realized gain recorded on April 15, 2016 by Alleghany Capital, as more fully described in the following pages, partially offset by gains on the sale of certain exchange-traded funds in the third quarter of 2017.

The decreases in OTTI losses in the third quarter and first nine months of 2017 from the corresponding 2016 periods reflect decreases in OTTI losses related to debt and equity securities.

A comparison of investment results for the third quarter and first nine months of 2017 and 2016 is more fully described in the following pages.

Other revenue and expenses. The following table presents our consolidated other revenue and expenses:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017	2016		Percent Change	2017		2016		Percent Change
	($ in millions)
Other revenue	$      296.3	$	225.0	31.7%	$	650.4	$	527.8	23.2%
Other operating expenses	277.9		228.4	21.7%		678.2		575.5	17.8%
Corporate administration	(4.7)		10.7	(143.9%)		26.6		34.0	(21.8%)
Amortization of intangible assets	5.7		6.0	(5.0%)		14.2		14.5	(2.1%)
Interest expense	20.8		20.7	0.5%		62.7		61.4	2.1%

Other revenue and Other operating expenses. Other revenue and other operating expenses primarily include sales revenues and expenses associated with Alleghany Capital. Other operating expenses also include the long-term incentive compensation at our reinsurance and insurance segments, which totaled $5.4 million and $19.4 million in the third quarter of 2017 and 2016, respectively, and $50.4 million and $61.5 million in the first nine months of 2017 and 2016, respectively. The decreases in long-term incentive compensation at our reinsurance and insurance segments in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the impact of losses arising from Hurricanes Harvey, Irma and Maria on long-term 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 for $164.5 million, including $163.9 million in cash paid on May 1, 2017 and $0.6 million of estimated purchase price adjustments.

The increases in other revenue in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the acquisition of W&W|AFCO Steel. The increases in other operating expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the acquisition of W&W|AFCO Steel, partially offset by decreases in the long-term incentive compensation of our reinsurance and insurance segments. The increase in other operating expenses in the first nine months of 2017 from the first nine months of 2016 also reflects finders fees, legal and accounting costs and other transaction-related expenses at the Alleghany Capital level.

Corporate administration. The negative corporate administration expense in the third quarter of 2017, compared with corporate administration expense in the third quarter of 2016, and the decrease in corporate administration expense in the first nine months of 2017 from the first nine months of 2016, primarily reflect the impact of losses arising from Hurricanes Harvey, Irma and Maria on long-term incentive compensation expense accruals at Alleghany.

Amortization of intangible assets. The decreases in amortization expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect decreases in amortization expense at IPS, as certain of IPS’s intangible assets were fully amortized as of December 31, 2016, partially offset by the amortization of net intangible assets related to the acquisition of W&W|AFCO Steel.

35

Interest expense. The increases in interest expense in the third quarter and first nine months of 2017 from the corresponding 2016 periods reflect new or increased borrowings at Bourn & Koch and Jazwares and borrowings at W&W|AFCO Steel.

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017	2016		Percent Change	2017	2016	Percent Change
	($ in millions)
Income taxes	$    (212.3)	$	48.4	(538.6%)	$    (116.3)	$    162.3	(171.7%)
Effective tax rate					66.8%	29.3%
The income tax benefits in the third quarter and first nine months of 2017 compared with income tax expenses in the corresponding 2016 periods reflect the impact of taxable losses arising from Hurricanes Harvey, Irma and Maria. The 66.8 percent effective tax rate is calculated based on actual results through September 30, 2017, because management was not able to reliably estimate the annual effective tax rate in light of the recent catastrophe losses incurred. In addition, income taxes in the first nine months of 2016 include prior period income tax expense adjustments. The effective tax rate in the first nine months of 2017 compared with the first nine months of 2016 primarily reflects income tax benefits from taxable losses arising from Hurricanes Harvey, Irma and Maria in the first nine months of 2017, and prior period income tax expense adjustments in the first nine months of 2016, which include $16.1 million of out-of-period reductions to current and deferred TransRe tax assets recorded in the first nine months of 2016 that relate primarily to periods prior to our merger with TransRe in 2012. Earnings. The following table presents our consolidated earnings:
	Three Months Ended September 30,				Nine Months Ended September 30,
	2017	2016		Percent Change	2017	2016	Percent Change
	($ in millions)
(Losses) earnings before income taxes	$    (522.3)	$	207.2	(352.1%)	$    (174.3)	$    553.0	(131.5%)
Net (losses) earnings attributable to Alleghany stockholders	(314.2)		155.8	(301.7%)	(63.2)	387.4	(116.3%)

The losses before income taxes and net losses attributable to Alleghany stockholders in the third quarter and first nine months of 2017, compared with earnings before income taxes and net earnings attributable to Alleghany stockholders in the corresponding 2016 periods primarily reflect significant catastrophe losses from Hurricanes Harvey, Irma and Maria at our reinsurance and insurance segments, as discussed above.

36

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 2016 Form 10-K.

The underwriting results of the reinsurance segment are presented below.

Three Months Ended September 30, 2017	Property		Casualty & Other(1)		Total
	($ in millions)
Gross premiums written	$	445.5	$	681.1	$	1,126.6
Net premiums written		329.0		649.5		978.5
Net premiums earned		310.8		642.4		953.2
Net loss and LAE:
Current year (excluding catastrophe losses)		162.0		431.0		593.0
Current year catastrophe losses		506.0		70.0		576.0
Prior years		(8.1)		(41.7)		(49.8)
Total net loss and LAE		659.9		459.3		1,119.2
Commissions, brokerage and other underwriting expenses		105.2		203.7		308.9
Underwriting (loss)(2)	$	(454.3)	$	(20.6)	$	(474.9)
Loss ratio(3):
Current year (excluding catastrophe losses)		52.1%		67.1%		62.3%
Current year catastrophe losses		162.8%		10.9%		60.4%
Prior years		(2.6%)		(6.5%)		(5.2%)
Total net loss and LAE		212.3%		71.5%		117.5%
Expense ratio(4)		33.8%		31.7%		32.3%
Combined ratio(5)		246.1%		103.2%		149.8%

37

Three Months Ended September 30, 2016	Property		Casualty & Other(1)		Total
	($ in millions)
Gross premiums written	$	400.2	$	665.2	$	1,065.4
Net premiums written		320.5		646.4		966.9
Net premiums earned		314.6		654.8		969.4
Net loss and LAE:
Current year (excluding catastrophe losses)		147.0		462.6		609.6
Current year catastrophe losses		21.4		0.2		21.6
Prior years		(10.8)		(58.2)		(69.0)
Total net loss and LAE		157.6		404.6		562.2
Commissions, brokerage and other underwriting expenses		105.4		227.7		333.1
Underwriting profit(2)	$	51.6	$	22.5	$	74.1
Loss ratio(3):
Current year (excluding catastrophe losses)		46.7%		70.6%		62.8%
Current year catastrophe losses		6.8%		-  %		2.2%
Prior years		(3.4%)		(8.9%)		(7.1%)
Total net loss and LAE		50.1%		61.7%		57.9%
Expense ratio(4)		33.5%		34.8%		34.4%
Combined ratio(5)		83.6%		96.5%		92.3%
Nine Months Ended September 30, 2017	Property		Casualty & Other(1)		Total
	($ in millions)
Gross premiums written	$	1,190.0	$	2,037.7	$	3,227.7
Net premiums written		931.4		1,975.3		2,906.7
Net premiums earned		868.1		1,968.7		2,836.8
Net loss and LAE:
Current year (excluding catastrophe losses)		461.2		1,352.9		1,814.1
Current year catastrophe losses		506.0		70.0		576.0
Prior years		(62.6)		(78.2)		(140.8)
Total net loss and LAE		904.6		1,344.7		2,249.3
Commissions, brokerage and other underwriting expenses		283.7		662.9		946.6
Underwriting (loss)(2)	$	(320.2)	$	(38.9)	$	(359.1)
Loss ratio(3):
Current year (excluding catastrophe losses)		53.1%		68.7%		63.9%
Current year catastrophe losses		58.3%		3.6%		20.3%
Prior years		(7.2%)		(4.0%)		(5.0%)
Total net loss and LAE		104.2%		68.3%		79.2%
Expense ratio(4)		32.7%		33.7%		33.4%
Combined ratio(5)		136.9%		102.0%		112.6%

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Nine Months Ended September 30, 2016	Property		Casualty & Other(1)		Total
	($ in millions)
Gross premiums written	$	1,173.3	$	2,136.7	$	3,310.0
Net premiums written		945.1		2,088.3		3,033.4
Net premiums earned		857.9		2,030.6		2,888.5
Net loss and LAE:
Current year (excluding catastrophe losses)		418.7		1,419.5		1,838.2
Current year catastrophe losses		115.5		1.9		117.4
Prior years		(79.3)		(138.7)		(218.0)
Total net loss and LAE		454.9		1,282.7		1,737.6
Commissions, brokerage and other underwriting expenses		275.6		693.6		969.2
Underwriting profit(2)	$	127.4	$	54.3	$	181.7
Loss ratio(3):
Current year (excluding catastrophe losses)		48.8%		69.9%		63.6%
Current year catastrophe losses		13.5%		0.1%		4.1%
Prior years		(9.2%)		(6.8%)		(7.4%)
Total net loss and LAE		53.1%		63.2%		60.3%
Expense ratio(4)		32.1%		34.2%		33.6%
Combined ratio(5)		85.2%		97.4%		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, net realized capital gains, OTTI losses, other 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 September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
Property
Premiums written:
Gross premiums written	$	445.5	$	400.2		11.3%	$	1,190.0	$	1,173.3		1.4%
Net premiums written		329.0		320.5		2.7%		931.4		945.1		(1.4%)
Net premiums earned		310.8		314.6		(1.2%)		868.1		857.9		1.2%
Casualty & other
Premiums written:
Gross premiums written	$	681.1	$	665.2		2.4%	$	2,037.7	$	2,136.7		(4.6%)
Net premiums written		649.5		646.4		0.5%		1,975.3		2,088.3		(5.4%)
Net premiums earned		642.4		654.8		(1.9%)		1,968.7		2,030.6		(3.0%)
Total
Premiums written:
Gross premiums written	$	1,126.6	$	1,065.4		5.7%	$	3,227.7	$	3,310.0		(2.5%)
Net premiums written		978.5		966.9		1.2%		2,906.7		3,033.4		(4.2%)
Net premiums earned		953.2		969.4		(1.7%)		2,836.8		2,888.5		(1.8%)

Property. The increase in gross premiums written in the third quarter of 2017 from the third quarter of 2016 primarily reflects reinstatement premiums written related to the significant catastrophe losses that occurred in the third quarter of 2017 and, to a lesser extent, the impact of changes in foreign currency exchange rates. The increase in gross premiums written for the first nine months of 2017 from the first nine months of 2016 primarily reflects reinstatement premiums written, partially offset by cancellations, non-renewals and reduced participations in certain international treaties and the impact of changes in foreign currency exchange rates. Gross premiums written related to the Quota Share Treaty were $92.5 million and $93.5 million in the third quarter of 2017 and 2016, respectively, and $263.2 million and $265.3 million in the first nine months of 2017 and 2016, respectively. Excluding the impact of changes in foreign currency exchange rates, gross premiums written increased 10.9 percent in the third quarter of 2017 from the third quarter of 2016, and 1.7 percent in the first nine months of 2017 from the first nine months of 2016.

The decrease in net premiums earned in the third quarter of 2017 from the third quarter of 2016 primarily reflects a decrease in net premiums written in recent quarters, partially offset by $32.1 million of net reinstatement premiums earned related to the significant catastrophe losses that occurred in the third quarter of 2017. The increase in net premiums earned in the first nine months of 2017 from the first nine months of 2016 primarily reflects increased premiums earned related to the Quota Share Treaty and $32.1 million of net reinstatement premiums earned, partially offset by a decrease in net premiums written in recent quarters. Excluding the impact of changes in foreign currency exchange rates, net premiums earned decreased 1.5 percent in the third quarter of 2017 from the third quarter of 2016, and increased 1.7 percent in the first nine months of 2017 from the first nine months of 2016.

Casualty & other. The increase in gross premiums written in the third quarter of 2017 from the third quarter of 2016 primarily reflects an increase in premiums written related to the Quota Share Treaty and reinstatement premiums written related to the significant catastrophe losses that occurred in the third quarter of 2017. The decrease in gross premiums written in the first nine months of 2017 from the first nine months of 2016 primarily reflects cancellations, non-renewals and reduced participations in certain international treaties, as well as the impact of rate pressures and increased retentions by cedants, the impact of changes in foreign currency exchange rates and a decrease in casualty-related premiums written related to the Quota Share Treaty, partially offset by reinstatement premiums written related to the significant catastrophe losses that occurred in the third quarter of 2017. Gross premiums written related to the Quota Share Treaty were $113.3 million and $105.9 million in the third quarter of 2017 and 2016, respectively, and $316.7 million and $358.9 million in the first nine months of 2017 and 2016, respectively. Premiums related to the Quota Share Treaty in the first nine months of 2016 reflect elevated premiums written in the first quarter of 2016 due to differences between initial premium estimates at contract inception, which were recorded in the fourth quarter of 2015, and actual data subsequently reported. As a consequence of this change in estimate, premiums written in the fourth quarter of 2015 were understated and premiums written in the first quarter of 2016 were correspondingly increased. In general, when actual data has not been reported by ceding companies, premiums written are estimated based on historical patterns and other relevant factors. Any differences between these estimates and actual data subsequently reported are recorded in the period when actual data becomes available. Excluding the impact of changes in foreign currency exchange

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rates, gross premiums written increased 2.3 percent in the third quarter of 2017 from the third quarter of 2016, and decreased 3.9 percent in the first nine months of 2017 from the first nine months of 2016.

The decrease in net premiums earned in the third quarter of 2017 from the third quarter of 2016 primarily reflects a decrease in net premiums written in recent quarters, partially offset by $5.0 million of net reinstatement premiums earned related to the significant catastrophe losses that occurred in the third quarter of 2017. The decrease in net premiums earned in the first nine months of 2017 from the first nine months of 2016 primarily reflects the decline in net premiums written in recent quarters and the impact of changes in foreign currency exchange rates, partially offset by $5.0 million of net reinstatement premiums earned. Excluding the impact of changes in foreign currency exchange rates, net premiums earned decreased 2.0 percent in the third quarter of 2017 from the third quarter of 2016, and decreased 2.1 percent in the first nine months of 2017 from the first nine months of 2016.

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
Property
Net loss and LAE:
Current year (excluding catastrophe losses)	$	162.0	$	147.0		10.2%	$	461.2	$	418.7		10.2%
Current year catastrophe losses		506.0		21.4		2,264.5%		506.0		115.5		338.1%
Prior years		(8.1)		(10.8)		(25.0%)		(62.6)		(79.3)		(21.1%)
Total net loss and LAE	$	659.9	$	157.6		318.7%	$	904.6	$	454.9		98.9%
Loss ratio:
Current year (excluding catastrophe losses)		52.1%		46.7%				53.1%		48.8%
Current year catastrophe losses		162.8%		6.8%				58.3%		13.5%
Prior years		(2.6%)		(3.4%)				(7.2%)		(9.2%)
Total net loss and LAE		212.3%		50.1%				104.2%		53.1%
Casualty & other
Net loss and LAE:
Current year (excluding catastrophe losses)	$	431.0	$	462.6		(6.8%)	$	1,352.9	$	1,419.5		(4.7%)
Current year catastrophe losses		70.0		0.2		34,900%		70.0		1.9		3,584%
Prior years		(41.7)		(58.2)		(28.4%)		(78.2)		(138.7)		(43.6%)
Total net loss and LAE	$	459.3	$	404.6		13.5%	$	1,344.7	$	1,282.7		4.8%
Loss ratio:
Current year (excluding catastrophe losses)		67.1%		70.6%				68.7%		69.9%
Current year catastrophe losses		10.9%		-    %				3.6%		0.1%
Prior years		(6.5%)		(8.9%)				(4.0%)		(6.8%)
Total net loss and LAE		71.5%		61.7%				68.3%		63.2%
Total
Net loss and LAE:
Current year (excluding catastrophe losses)	$	593.0	$	609.6		(2.7%)	$	1,814.1	$	1,838.2		(1.3%)
Current year catastrophe losses		576.0		21.6		2,566.7%		576.0		117.4		390.6%
Prior years		(49.8)		(69.0)		(27.8%)		(140.8)		(218.0)		(35.4%)
Total net loss and LAE	$	1,119.2	$	562.2		99.1%	$	2,249.3	$	1,737.6		29.4%
Loss ratio:
Current year (excluding catastrophe losses)		62.3%		62.8%				63.9%		63.6%
Current year catastrophe losses		60.4%		2.2%				20.3%		4.1%
Prior years		(5.2%)		(7.1%)				(5.0%)		(7.4%)
Total net loss and LAE		117.5%		57.9%				79.2%		60.3%

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Property. The increases in net loss and LAE in the third quarter and first nine months of 2017 from the corresponding 2016 periods, primarily reflect higher catastrophe losses. Catastrophe losses in the third quarter and first nine months of 2017 include $160.7 million related to Hurricane Harvey in August 2017, $175.0 million related to Hurricane Irma in September 2017, $142.4 million related to Hurricane Maria in September 2017 and $27.9 million related to earthquakes in Mexico in September 2017. The catastrophe losses in the first nine months of 2016 relate to wildfire losses in Alberta, Canada, earthquake losses in Japan and earthquake losses in Ecuador, all of which occurred in the second quarter of 2016, and catastrophe losses in the third quarter of 2016 that relate primarily to typhoons and floods in China.

Net loss and LAE in the third quarter and first nine months of 2017 and 2016 include (favorable) unfavorable prior accident year loss reserve development as shown in the table below.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	($ in millions)
Catastrophe events	$	(7.8)	(1)	$	(1.2)	(2)	$	(12.2)	(1)	$	(9.0)	(2)
Non-catastrophe		(0.3)			(9.6)	(3)		(50.4)	(4)		(70.3)	(3)
Total	$	(8.1)		$	(10.8)		$	(62.6)		$	(79.3)

(1) Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2016 accident years.

(2) Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2015 accident years.

(3) Reflects favorable prior accident year loss reserve development primarily related to the 2014 through 2015 accident years.

(4) Reflects favorable prior accident year loss reserve development primarily related to the 2013 through 2016 accident years.

The favorable prior accident year loss reserve development in the third quarter and first nine months of 2017 and 2016 reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods. The favorable prior accident year loss reserve development in the third quarter and first nine months of 2017 did not impact assumptions used in estimating TransRe’s loss and LAE liabilities for business earned in the first nine months of 2017.

Casualty & other. The increases in net loss and LAE in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect higher catastrophe losses and less favorable prior accident year loss reserve development.

Catastrophe losses in the third quarter and first nine months of 2017 relate primarily to the marine lines of business, and include $20.3 million related to Hurricane Harvey in August 2017, $33.3 million related to Hurricane Irma in September 2017, $13.6 million related to Hurricane Maria in September 2017 and $2.8 million related to earthquakes in Mexico in September 2017. Catastrophe losses in the third quarter and first nine months of 2016 relate to earthquake losses in Ecuador.

Net loss and LAE in the third quarter and first nine months of 2017 and 2016 include (favorable) unfavorable prior accident year loss reserve development as shown in the table below.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	($ in millions)
Malpractice Treaties(1)	$	-		$	(2.0)		$	(2.0)		$	(10.8)
Ogden rate impact(2)		-			-			24.4			-
Other		(41.7)	(3)		(56.2)	(4)		(100.6)	(5)		(127.9)	(4)
Total	$	(41.7)		$	(58.2)		$	(78.2)		$	(138.7)

(1) Represents certain medical malpractice treaties, or the “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 arising from the U.K. Ministry of Justice’s decision to significantly reduce 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. As of March 20, 2017, the Ogden rate changed from 2.50 percent to negative 0.75 percent.

(3) Primarily reflects favorable prior accident year loss reserve development in longer-tailed U.S. professional liability lines of business related to older accident years and shorter-tailed casualty lines of business in the U.K. related to recent accident years.

(4) Generally reflects favorable prior accident year loss reserve development in a variety of casualty & other lines of business primarily related to the 2005, 2006 and 2008 through 2015 accident years.

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

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The favorable prior accident year loss reserve development in the third quarter and first nine months of 2017 and 2016 reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods. The favorable prior accident year loss reserve development in the third quarter and first nine months of 2017 did not impact assumptions used in estimating TransRe’s loss and LAE liabilities for business earned in the first nine months of 2017.

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 September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
Property
Commissions, brokerage and other underwriting expenses	$	105.2	$	105.4		(0.2%)	$	283.7	$	275.6		2.9%
Expense ratio		33.8%		33.5%				32.7%		32.1%
Casualty & other
Commissions, brokerage and other underwriting expenses	$	203.7	$	227.7		(10.5%)	$	662.9	$	693.6		(4.4%)
Expense ratio		31.7%		34.8%				33.7%		34.2%
Total
Commissions, brokerage and other underwriting expenses	$	308.9	$	333.1		(7.3%)	$	946.6	$	969.2		(2.3%)
Expense ratio		32.3%		34.4%				33.4%		33.6%

Property. The increase in commissions, brokerage and other underwriting expenses in the first nine months of 2017 from the first nine months of 2016 primarily reflects the impact of higher net premiums earned and an increase in commission rates, partially offset by lower short-term incentive compensation expense accruals arising from the significant catastrophe losses that occurred in the third quarter of 2017.

Casualty & other. The decreases in commissions, brokerage and other underwriting expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect lower short-term incentive compensation expense accruals arising from the significant catastrophe losses that occurred in the third quarter of 2017, the impact of lower net premiums earned and a decrease in profit commissions related to the Malpractice Treaties.

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
Property
Underwriting (loss) profit	$	(454.3)	$	51.6		(980.4%)	$	(320.2)	$	127.4		(351.3%)
Combined ratio		246.1%		83.6%				136.9%		85.2%
Casualty & other
Underwriting (loss) profit	$	(20.6)	$	22.5		(191.6%)	$	(38.9)	$	54.3		(171.6%)
Combined ratio		103.2%		96.5%				102.0%		97.4%
Total
Underwriting (loss) profit	$	(474.9)	$	74.1		(740.9%)	$	(359.1)	$	181.7		(297.6%)
Combined ratio		149.8%		92.3%				112.6%		93.9%

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Property. The underwriting losses in the third quarter and first nine months of 2017, compared with underwriting profits in the corresponding 2016 periods, primarily reflect significant catastrophe losses from Hurricanes Harvey, Irma and Maria, as discussed above.

Casualty & other. The underwriting losses in the third quarter and first nine months of 2017, compared with underwriting profits in the corresponding 2016 periods primarily reflect significant catastrophe losses from Hurricanes Harvey, Irma and Maria, as well as less favorable prior accident year loss reserve development, as discussed above.

Insurance Segment Underwriting Results

The insurance segment is comprised of AIHL’s RSUI, CapSpecialty and PacificComp 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 2016 Form 10-K.

The underwriting results of the insurance segment are presented below.

Three Months Ended September 30, 2017	RSUI		CapSpecialty		PacificComp		Total
	($ in millions)
Gross premiums written	$	234.6	$	74.3	$	41.6	$	350.5
Net premiums written		170.8		69.5		41.5		281.8
Net premiums earned		179.0		66.1		41.4		286.5
Net loss and LAE:
Current year (excluding catastrophe losses)		99.3		37.5		31.1		167.9
Current year catastrophe losses		214.7		1.8		-		216.5
Prior years		(8.6)		(2.3)		(0.8)		(11.7)
Total net loss and LAE		305.4		37.0		30.3		372.7
Commissions, brokerage and other underwriting expenses		50.3		28.4		10.6		89.3
Underwriting (loss) profit(1)	$	(176.7)	$	0.7	$	0.5	$	(175.5)
Loss ratio(2):
Current year (excluding catastrophe losses)		55.5%		56.8%		75.2%		58.6%
Current year catastrophe losses		119.9%		2.7%		-    %		75.6%
Prior years		(4.8%)		(3.5%)		(1.9%)		(4.1%)
Total net loss and LAE		170.6%		56.0%		73.3%		130.1%
Expense ratio(3)		28.1%		43.0%		25.5%		31.2%
Combined ratio(4)		198.7%		99.0%		98.8%		161.3%

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Three Months Ended September 30, 2016	RSUI		CapSpecialty		PacificComp		Total
	($ in millions)
Gross premiums written	$	243.7	$	68.5	$	37.8	$	350.0
Net premiums written		168.3		64.4		37.1		269.8
Net premiums earned		186.8		61.6		35.7		284.1
Net loss and LAE:
Current year (excluding catastrophe losses)		102.6		33.6		27.1		163.3
Current year catastrophe losses		8.7		1.8		-		10.5
Prior years		(16.5)		(0.9)		-		(17.4)
Total net loss and LAE		94.8		34.5		27.1		156.4
Commissions, brokerage and other underwriting expenses		53.9		26.4		9.6		89.9
Underwriting profit (loss)(1)	$	38.1	$	0.7	$	(1.0)	$	37.8
Loss ratio(2):
Current year (excluding catastrophe losses)		54.9%		54.6%		76.0%		57.5%
Current year catastrophe losses		4.7%		2.9%		-   %		3.7%
Prior years		(8.8%)		(1.5%)		-   %		(6.1%)
Total net loss and LAE		50.8%		56.0%		76.0%		55.1%
Expense ratio(3)		28.9%		42.9%		26.9%		31.7%
Combined ratio(4)		79.7%		98.9%		102.9%		86.8%
Nine Months Ended September 30, 2017	RSUI		CapSpecialty		PacificComp		Total
	($ in millions)
Gross premiums written	$	794.1	$	213.2	$	124.2	$	1,131.5
Net premiums written		558.0		198.9		122.9		879.8
Net premiums earned		540.3		192.2		123.5		856.0
Net loss and LAE:
Current year (excluding catastrophe losses)		279.1		104.8		93.1		477.0
Current year catastrophe losses		227.9		4.0		-		231.9
Prior years		(27.3)		(3.1)		(1.8)		(32.2)
Total net loss and LAE		479.7		105.7		91.3		676.7
Commissions, brokerage and other underwriting expenses		158.3		83.3		32.2		273.8
Underwriting (loss) profit(1)	$	(97.7)	$	3.2	$	-	$	(94.5)
Loss ratio(2):
Current year (excluding catastrophe losses)		51.7%		54.5%		75.4%		55.8%
Current year catastrophe losses		42.2%		2.1%		-   %		27.1%
Prior years		(5.1%)		(1.6%)		(1.5%)		(3.8%)
Total net loss and LAE		88.8%		55.0%		73.9%		79.1%
Expense ratio(3)		29.3%		43.4%		26.1%		32.0%
Combined ratio(4)		118.1%		98.4%		100.0%		111.1%

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Nine Months Ended September 30, 2016	RSUI		CapSpecialty		PacificComp		Total
	($ in millions)
Gross premiums written	$	808.3	$	201.5	$	105.9	$	1,115.7
Net premiums written		566.3		189.0		104.5		859.8
Net premiums earned		567.4		175.8		104.9		848.1
Net loss and LAE:
Current year (excluding catastrophe losses)		291.9		90.6		79.5		462.0
Current year catastrophe losses		37.6		5.0		-		42.6
Prior years		(40.5)		(3.2)		-		(43.7)
Total net loss and LAE		289.0		92.4		79.5		460.9
Commissions, brokerage and other underwriting expenses		161.9		78.7		28.9		269.5
Underwriting profit (loss)(1)	$	116.5	$	4.7	$	(3.5)	$	117.7
Loss ratio(2):
Current year (excluding catastrophe losses)		51.4%		51.6%		75.8%		54.5%
Current year catastrophe losses		6.6%		2.8%		-    %		5.0%
Prior years		(7.1%)		(1.8%)		-    %		(5.2%)
Total net loss and LAE		50.9%		52.6%		75.8%		54.3%
Expense ratio(3)		28.5%		44.8%		27.6%		31.8%
Combined ratio(4)		79.4%		97.4%		103.4%		86.1%

(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, net realized capital gains, OTTI losses, other 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 September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
RSUI
Premiums written:
Gross premiums written	$	234.6	$	243.7		(3.7%)	$	794.1	$	808.3		(1.8%)
Net premiums written		170.8		168.3		1.5%		558.0		566.3		(1.5%)
Net premiums earned		179.0		186.8		(4.2%)		540.3		567.4		(4.8%)
CapSpecialty
Premiums written:
Gross premiums written	$	74.3	$	68.5		8.5%	$	213.2	$	201.5		5.8%
Net premiums written		69.5		64.4		7.9%		198.9		189.0		5.2%
Net premiums earned		66.1		61.6		7.3%		192.2		175.8		9.3%
PacificComp
Premiums written:
Gross premiums written	$	41.6	$	37.8		10.1%	$	124.2	$	105.9		17.3%
Net premiums written		41.5		37.1		11.9%		122.9		104.5		17.6%
Net premiums earned		41.4		35.7		16.0%		123.5		104.9		17.7%
Total
Premiums written:
Gross premiums written	$	350.5	$	350.0		0.1%	$	1,131.5	$	1,115.7		1.4%
Net premiums written		281.8		269.8		4.4%		879.8		859.8		2.3%
Net premiums earned		286.5		284.1		0.8%		856.0		848.1		0.9%

RSUI. The decreases in gross premiums written in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect decreases in the property and directors’ and officers’ liability lines of business, all due to an increase in competition and a reduction in pricing, partially offset by growth in the general liability lines of business.

The decreases in net premiums earned in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect a decrease in gross premiums written in the second and third quarters of 2017 and the fourth quarter of 2016, partially offset by a modest increase in gross premiums written in the first quarter of 2017.

CapSpecialty. The increases in gross premiums written in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect growth in the professional liability and miscellaneous medical lines of business due to CapSpecialty’s distribution initiatives, partially offset by a decrease in the environmental and construction liability lines of business.

The increases in net premiums earned in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect an increase in gross premiums written in recent quarters.

PacificComp. The increases in gross premiums written and net premiums earned in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect premium growth due to PacificComp’s distribution initiatives and growth in targeted segments of the workers’ compensation market in the State of California.

47

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
RSUI
Net loss and LAE:
Current year (excluding catastrophe losses)	$	99.3	$	102.6		(3.2%)	$	279.1	$	291.9		(4.4%)
Current year catastrophe losses		214.7		8.7		2,367.8%		227.9		37.6		506.1%
Prior years		(8.6)		(16.5)		(47.9%)		(27.3)		(40.5)		(32.6%)
Total net loss and LAE	$	305.4	$	94.8		222.2%	$	479.7	$	289.0		66.0%
Loss ratio:
Current year (excluding catastrophe losses)		55.5%		54.9%				51.7%		51.4%
Current year catastrophe losses		119.9%		4.7%				42.2%		6.6%
Prior years		(4.8%)		(8.8%)				(5.1%)		(7.1%)
Total net loss and LAE		170.6%		50.8%				88.8%		50.9%
CapSpecialty
Net loss and LAE:
Current year (excluding catastrophe losses)	$	37.5	$	33.6		11.6%	$	104.8	$	90.6		15.7%
Current year catastrophe losses		1.8		1.8		-   %		4.0		5.0		(20.0%)
Prior years		(2.3)		(0.9)		155.6%		(3.1)		(3.2)		(3.1%)
Total net loss and LAE	$	37.0	$	34.5		7.2%	$	105.7	$	92.4		14.4%
Loss ratio:
Current year (excluding catastrophe losses)		56.8%		54.6%				54.5%		51.6%
Current year catastrophe losses		2.7%		2.9%				2.1%		2.8%
Prior years		(3.5%)		(1.5%)				(1.6%)		(1.8%)
Total net loss and LAE		56.0%		56.0%				55.0%		52.6%
PacificComp
Net loss and LAE:
Current year (excluding catastrophe losses)	$	31.1	$	27.1		14.8%	$	93.1	$	79.5		17.1%
Current year catastrophe losses		-		-		–		-		-		–
Prior years		(0.8)		-		–		(1.8)		-		–
Total net loss and LAE	$	30.3	$	27.1		11.8%	$	91.3	$	79.5		14.8%
Loss ratio:
Current year (excluding catastrophe losses)		75.2%		76.0%				75.4%		75.8%
Current year catastrophe losses		-   %		-   %				-   %		-   %
Prior years		(1.9%)		-   %				(1.5%)		-   %
Total net loss and LAE		73.3%		76.0%				73.9%		75.8%
Total
Net loss and LAE:
Current year (excluding catastrophe losses)	$	167.9	$	163.3		2.8%	$	477.0	$	462.0		3.2%
Current year catastrophe losses		216.5		10.5		1,961.9%		231.9		42.6		444.4%
Prior years		(11.7)		(17.4)		(32.8%)		(32.2)		(43.7)		(26.3%)
Total net loss and LAE	$	372.7	$	156.4		138.3%	$	676.7	$	460.9		46.8%
Loss ratio:
Current year (excluding catastrophe losses)		58.6%		57.5%				55.8%		54.5%
Current year catastrophe losses		75.6%		3.7%				27.1%		5.0%
Prior years		(4.1%)		(6.1%)				(3.8%)		(5.2%)
Total net loss and LAE		130.1%		55.1%				79.1%		54.3%

48

RSUI. The increases in net loss and LAE in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect higher catastrophe losses.

Catastrophe losses in the third quarter and first nine months of 2017 include $83.3 million related to Hurricane Harvey in August 2017, $103.7 million related to Hurricane Irma in September 2017 and $14.3 million related to Hurricane Maria in September 2017. Catastrophe losses in the third quarter and first nine months of 2017 also reflect losses from flooding in the State of California and severe weather primarily in the Southeastern and Midwestern U.S. Catastrophe losses in the third quarter of 2016 primarily reflect losses from flooding and severe weather primarily in the State of Louisiana and the Midwestern U.S. Catastrophe losses in the first nine months of 2016 also reflect losses from flooding and severe weather primarily in the State of Texas in April and May and, to a lesser extent, losses from wildfires in Alberta, Canada in May.

Net loss and LAE in the third quarter and first nine months of 2017 and 2016 include (favorable) unfavorable prior accident year loss reserve development as shown in the table below.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	($ in millions)
Casualty	$	(6.9)	(1)	$	(11.9)	(2)	$	(28.5)	(1)	$	(32.1)	(2)
Property and other		(1.7)	(3)		(4.6)	(4)		1.2	(5)		(8.4)	(4)
Total	$	(8.6)		$	(16.5)		$	(27.3)		$	(40.5)

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

(2) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess, general liability and professional liability lines of business related to the 2006 through 2012 accident years.

(3) Primarily reflects favorable unallocated LAE development.

(4) Primarily reflects favorable prior accident year loss reserve development in the non-catastrophe property lines of business in recent accident years.

(5) Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business primarily related to the 2015 and 2016 accident years, partially offset by favorable catastrophe prior accident year loss reserve development related to the 2016 accident year.

The favorable prior accident year loss reserve development in the third quarter and first nine months of 2017 and 2016 reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods. The favorable prior accident year loss reserve development in the third quarter and first nine months of 2017 did not impact assumptions used in estimating RSUI’s loss and LAE liabilities for business earned in the first nine months of 2017.

CapSpecialty. The increases in net loss and LAE in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the impact of higher net premiums earned and higher property losses. The increase in net loss and LAE in the third quarter of 2017 from the third quarter of 2016 was partially offset by more favorable prior accident year loss reserve development. Catastrophe losses in the third quarter and first nine months of 2017 include $0.3 million related to Hurricane Harvey in August 2017.

Net loss and LAE in the third quarter and first nine months of 2017 include favorable prior accident year loss reserve development primarily in the casualty lines of business primarily related to the 2010, 2014, 2015 and 2016 accident years. The favorable prior accident year loss reserve development in the first nine months of 2017 reflects net favorable loss emergence compared with loss emergence patterns assumed in earlier periods. Net loss and LAE in the third quarter of 2016 includes favorable prior accident year loss reserve development primarily in the surety lines of business related to the 2015 accident year. Net loss and LAE in the first nine months of 2016 includes favorable prior accident year loss reserve development primarily related to CapSpecialty’s legacy asbestos-related illness and environmental impairment liabilities and the surety lines of business.

PacificComp. The increases in net loss and LAE in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the impact of higher net premiums earned, partially offset by favorable prior accident year loss reserve development in the corresponding 2017 periods.

The favorable prior accident year loss reserve development in the third quarter and first nine months of 2017 relates primarily to the 2013 and prior accident years, and reflects favorable loss emergence compared with loss emergence patterns assumed in earlier periods.

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 September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
RSUI
Commissions, brokerage and other underwriting expenses	$	50.3	$	53.9		(6.7%)	$	158.3	$	161.9		(2.2%)
Expense ratio		28.1%		28.9%				29.3%		28.5%
CapSpecialty
Commissions, brokerage and other underwriting expenses	$	28.4	$	26.4		7.6%	$	83.3	$	78.7		5.8%
Expense ratio		43.0%		42.9%				43.4%		44.8%
PacificComp
Commissions, brokerage and other underwriting expenses	$	10.6	$	9.6		10.4%	$	32.2	$	28.9		11.4%
Expense ratio		25.5%		26.9%				26.1%		27.6%
Total
Commissions, brokerage and other underwriting expenses	$	89.3	$	89.9		(0.7%)	$	273.8	$	269.5		1.6%
Expense ratio		31.2%		31.7%				32.0%		31.8%

RSUI. The decreases in commissions, brokerage and other underwriting expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the impact of lower net premiums earned and the impact of losses arising from Hurricanes Harvey, Irma and Maria on short-term incentive compensation expense accruals.

CapSpecialty. The increases in commissions, brokerage and other underwriting expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the impact of higher net premiums earned and relatively stable overhead expenses.

PacificComp. The increases in commissions, brokerage and other underwriting expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the impact of higher net premiums earned and relatively stable overhead expenses.

50

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
RSUI
Underwriting (loss) profit		$      (176.7)		$        38.1		(563.8%)		$        (97.7)		$        116.5		(183.9%)
Combined ratio		198.7%		79.7%				118.1%		79.4%
CapSpecialty
Underwriting profit		$           0.7		$          0.7		-    %		$           3.2		$           4.7		(31.9%)
Combined ratio		99.0%		98.9%				98.4%		97.4%
PacificComp
Underwriting profit (loss)		$          0.5		$        (1.0)		(150.0%)		$             -		$           (3.5)		(100.0%)
Combined ratio		98.8%		102.9%				100.0%		103.4%
Total
Underwriting (loss) profit		$    (175.5)		$       37.8		(564.3%)		$      (94.5)		$        117.7		(180.3%)
Combined ratio		161.3%		86.8%				111.1%		86.1%

RSUI. The underwriting losses in the third quarter and first nine months of 2017, compared with underwriting profits in the corresponding 2016 periods primarily reflect the impact of significant catastrophe losses from Hurricanes Harvey, Irma and Maria, as discussed above.

CapSpecialty. The decrease in underwriting profit in the first nine months of 2017 from the first nine months of 2016 primarily reflects the impact of higher property losses, as discussed above.

PacificComp. The underwriting profit in the third quarter of 2017 compared with the underwriting loss in the third quarter of 2016, and the decrease in underwriting loss in the first nine months of 2017 from the first nine months of 2016, primarily reflect favorable prior accident year loss reserve development and the impact of growing 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 September 30,						Nine Months Ended September 30,
	2017		2016		Percent Change		2017		2016		Percent Change
	($ in millions)
Net investment income		$        101.4		$        118.7		(14.6%)		$        311.7		$        326.4		(4.5%)
Net realized capital gains		21.5		27.1		(20.7%)		90.8		107.6		(15.6%)
Other than temporary impairment losses		(6.1)		(11.7)		(47.9%)		(13.1)		(38.2)		(65.7%)

Net Investment Income. The decreases in net investment income in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily relate to losses incurred on our equity interests in the Pillar Investments arising from significant catastrophe losses incurred in August and September 2017 and, for the first nine months of 2017 only, a $12.6 million charge on our equity investment in Ares. The charge on our equity investment in Ares reflects 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. Ares expects to receive future management fees derived from the assets under management of the acquired entity.

51

Net Realized Capital Gains. The decreases in net realized capital gains in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect lower gains for the equity and bond portfolio, partially offset by gains on the sale of certain exchange-traded funds in the third quarter of 2017. In addition, the first nine months of 2016 reflected a one-time $13.2 million realized gain recorded on April 15, 2016 by Alleghany Capital, as more fully described in the following pages.

Other Than Temporary Impairment Losses. OTTI losses in the first nine months of 2017 reflect $13.1 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $13.1 million of OTTI losses, $11.8 million related to equity securities, primarily in the retail sector, and $1.3 million related to debt securities. The determination that unrealized losses on equity and debt 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 $13.1 million of OTTI losses, $6.1 million was incurred in the third quarter of 2017.

OTTI losses in the first nine months of 2016 reflect $38.2 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $38.2 million of OTTI losses, $16.6 million related to equity securities, primarily in the retail, financial services, technology and chemical sectors, and $21.6 million related to debt securities, primarily in the energy sector. The determination that unrealized losses on equity and debt securities were other than temporary was primarily due to the severity and duration of the decline in the fair value of equity and debt securities relative to their costs. Of the $38.2 million of OTTI losses, $11.7 million was incurred in the third quarter of 2016.

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 September 30, 2017 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 and equity securities as of September 30, 2017.

Alleghany Capital Results

Alleghany Capital consists of: (i) manufacturing and service operations conducted through Bourn & Koch, Kentucky Trailer, IPS, Jazwares, W&W|AFCO Steel, beginning April 28, 2017, and a 45 percent equity interest in Wilbert Funeral Services, Inc., or “Wilbert,” beginning August 1, 2017; (ii) oil and gas operations conducted through SORC; and (iii) corporate operations and investments at the Alleghany Capital level.

On August 1, 2017, Alleghany Capital acquired a 45 percent equity interest in Wilbert, a provider of products and services for the funeral and cemetery industries and precast concrete markets, headquartered in Overland Park, Kansas, for $72.3 million. Wilbert is accounted for under the equity method of accounting and is included in other invested assets.

On April 28, 2017, Alleghany Capital acquired approximately 80 percent of the equity in W&W|AFCO Steel, a structural steel fabricator and erector headquartered in Oklahoma City, Oklahoma, for $164.5 million, including $163.9 million in cash paid on May 1, 2017 and $0.6 million of estimated purchase price adjustments.

In July 2014, Alleghany Capital acquired a 30 percent equity interest in Jazwares. On April 15, 2016, Alleghany Capital acquired an additional 50 percent of Jazwares’ outstanding equity, bringing its equity ownership interest to 80 percent and, as of that date, the results of Jazwares have been included in our consolidated results. Prior to April 15, 2016, Jazwares was accounted for under the equity method of accounting.

52

The results of Alleghany Capital for the third quarter and first nine months of 2017 and 2016 are presented below.

	Three Months Ended September 30,
	2017								2016
	Mfg. & Svcs.		Oil & Gas		Corp. & other		Total		Mfg. & Svcs.		Oil & Gas		Corp. & other		Total
	($ in millions)
Net investment income	$	0.9	$	-	$	0.7	$	1.6	$	-	$	-	$	-	$	-
Net realized capital gains		0.7		-		-		0.7		0.1		-		-		0.1
Other than temporary impairment losses		-		-		-		-		-		-		-		-
Other revenue		288.8		2.4		0.5		291.7		216.7		2.4		(0.5)		218.6
Other operating expenses		259.6		9.1		0.4		269.1		192.9		9.3		1.4		203.6
Corporate administration		-		-		-		-		-		-		-		-
Amortization of intangible assets		6.0		-		-		6.0		6.7		-		-		6.7
Interest expense		1.2		-		-		1.2		0.5		-		0.1		0.6
Earnings (losses) before income taxes	$	23.6	$	(6.7)	$	0.8	$	17.7	$	16.7	$	(6.9)	$	(2.0)	$	7.8
Adjusted EBITDA(1)	$	34.3	$	(3.8)	$	0.8	$	31.3	$	25.6	$	(3.4)	$	(1.9)	$	20.3
Less: depreciation expense		(3.2)		(2.9)		-		(6.1)		(1.8)		(3.5)		-		(5.3)
Less: amortization of intangible assets		(6.0)		-		-		(6.0)		(6.7)		-		-		(6.7)
Less: interest expense		(1.2)		-		-		(1.2)		(0.5)		-		(0.1)		(0.6)
Add: net realized capital gains		0.7		-		-		0.7		0.1		-		-		0.1
Adjustments to equity in earnings of Wilbert		(1.0)		-		-		(1.0)		-		-		-		-
Earnings (losses) before income taxes	$	23.6	$	(6.7)	$	0.8	$	17.7	$	16.7	$	(6.9)	$	(2.0)	$	7.8
	Nine Months Ended September 30,
	2017								2016
	Mfg. & Svcs.		Oil & Gas		Corp. & other		Total		Mfg. & Svcs.		Oil & Gas		Corp. & other		Total
	($ in millions)
Net investment income	$	1.1	$	-	$	1.0	$	2.1	$	0.2	$	-	$	(0.2)	$	-
Net realized capital gains		0.9		-		-		0.9		(0.2)		-		13.2		13.0
Other than temporary impairment losses		-		-		-		-		-		-		-		-
Other revenue		626.3		7.5		0.5		634.3		511.0		6.8		(0.5)		517.3
Other operating expenses		579.4		27.2		11.6		618.2		474.6		27.6		5.8		508.0
Corporate administration		-		-		-		-		-		-		-		-
Amortization of intangible assets		15.4		-		-		15.4		16.9		-		-		16.9
Interest expense		2.9		-		0.1		3.0		1.1		-		0.1		1.2
Earnings (losses) before income taxes	$	30.6	$	(19.7)	$	(10.2)	$	0.7	$	18.4	$	(20.8)	$	6.6	$	4.2
Adjusted EBITDA(1)	$	56.8	$	(10.9)	$	(10.1)	$	35.8	$	41.5	$	(10.1)	$	(6.5)	$	24.9
Less: depreciation expense		(7.8)		(8.8)		-		(16.6)		(4.9)		(10.7)		-		(15.6)
Less: amortization of intangible assets		(15.4)		-		-		(15.4)		(16.9)		-		-		(16.9)
Less: interest expense		(2.9)		-		(0.1)		(3.0)		(1.1)		-		(0.1)		(1.2)
Add: net realized capital gains		0.9		-		-		0.9		(0.2)		-		13.2		13.0
Adjustments to equity in earnings of Wilbert		(1.0)		-		-		(1.0)		-		-		-		-
Earnings (losses) before income taxes	$	30.6	$	(19.7)	$	(10.2)	$	0.7	$	18.4	$	(20.8)	$	6.6	$	4.2

(1) Adjusted EBITDA 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. Adjusted EBITDA represents other revenue less certain other expenses and does not include: (i) depreciation expense (a component of other operating expenses); (ii) amortization of intangible assets; (iii) interest expense; (iv) net realized capital gains; (v) OTTI impairment losses; and (vi) income taxes.

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The following table presents the changes in Alleghany Capital’s equity for the three and nine months ended September 30, 2017:

	Three Months Ended September 30, 2017								Nine Months Ended September 30, 2017
	Mfg. & Svcs.		Oil & Gas		Corp. & other		Total		Mfg. & Svcs.		Oil & Gas		Corp. & other		Total
	($ in millions)
Equity, beginning of period	$	607.5	$	146.0	$	(5.2)	$	748.3	$	453.4	$	149.2	$	(12.1)	$	590.5
Earnings (losses) before income taxes		23.6		(6.7)		0.8		17.7		30.6		(19.7)		(10.2)		0.7
Income taxes(1)		(0.7)		2.6		(5.2)		(3.3)		(0.9)		7.2		(3.6)		2.7
Net earnings attributable to noncontrolling interest		(4.2)		-		-		(4.2)		(5.2)		-		-		(5.2)
Capital contributions (returns of capital) and other(2)		67.0		7.3		0.5		74.8		215.3		12.5		16.8		244.6
Equity, end of period	$	693.2	$	149.2	$	(9.1)	$	833.3	$	693.2	$	149.2	$	(9.1)	$	833.3

(1) Income taxes for certain Alleghany Capital subsidiaries are incurred at the Alleghany Capital level.

(2) For the third quarter of 2017, primarily reflects the investment in Wilbert, and for the first nine months of 2017, also reflects the acquisition of W&W|AFCO Steel.

Net investment income. The increases in net investment income in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect Alleghany Capital’s earnings from its investment in Wilbert.

Net realized capital gains. Net realized capital gains in the first nine months of 2016 primarily reflect a gain of $13.2 million recognized by Alleghany Capital on April 15, 2016 in connection with the acquisition of an additional 50 percent equity ownership in Jazwares, when its pre-existing 30 percent equity ownership was remeasured at estimated fair value, or the “Jazwares Remeasurement Gain.”

Other revenue and Other operating expenses. The increases in other revenue and other operating expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect the acquisition of W&W|AFCO Steel. The increases in other operating expenses in the first nine months of 2017 from the first nine months of 2016 also reflect finders fees, legal and accounting costs and other transaction-related expenses at the Alleghany Capital level.

Amortization of intangible assets. The decreases in amortization expenses in the third quarter and first nine months of 2017 from the corresponding 2016 periods primarily reflect decreases in amortization expense at IPS, as certain of IPS’s intangible assets were fully amortized as of December 31, 2016, partially offset by the amortization of net intangible assets related to the acquisition of W&W|AFCO Steel.

Interest expense. The increases in interest expense in the third quarter and first nine months of 2017 from the corresponding 2016 periods reflect new or increased borrowings at Bourn & Koch and Jazwares and borrowings at W&W|AFCO Steel.

Earnings (losses) before income taxes. The increase in earnings before income taxes in the third quarter of 2017 from the third quarter of 2016 primarily reflects higher margins of the manufacturing and service operations, as well as the inclusion of W&W|AFCO Steel and our investment in Wilbert, as discussed above. The decrease in earnings before income taxes in the first nine months of 2017 from the first nine months of 2016 primarily reflects the $13.2 million Jazwares Remeasurement Gain in the 2016 period, partially offset by higher margins of the manufacturing and service operations, as well as the inclusion of W&W|AFCO Steel and our investment in Wilbert, all as discussed above.

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Corporate Activities Results

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions)
Net premiums earned	$	-	$	-	$	-	$	-
Net investment income		1.7		1.9		8.1		5.9
Net realized capital gains		10.7		-		10.1		(3.5)
Other than temporary impairment losses		-		-		-		-
Other revenue		(0.1)		6.1		5.6		6.7
Total revenues		12.3		8.0		23.8		9.1
Net loss and loss adjustment expenses		-		-		-		-
Commissions, brokerage and other underwriting expenses		-		-		-		-
Other operating expenses		0.5		1.2		2.6		2.4
Corporate administration		(3.2)		10.4		26.4		33.0
Amortization of intangible assets		-		-		-		-
Interest expense		13.0		13.3		39.5		39.6
Earnings (losses) before income taxes	$	2.0	$	(16.9)	$	(44.7)	$	(65.9)

Net investment income. The increase in net investment income in the first nine months of 2017 from the first nine months of 2016 primarily reflects higher income from new investments in other invested assets resulting from the purchase of certain non-marketable equity investments at the Alleghany parent company.

Net realized capital gains. The net realized capital gains in the third quarter and first nine months of 2017 primarily reflect gains on the sale of certain exchange-traded funds. The net realized capital losses in the first nine months of 2016 primarily reflect the sale at a loss of equity securities in the health care sector in the first quarter of 2016.

Other revenue. The decrease in other revenue in the third quarter of 2017 from the third quarter of 2016 reflects a gain on the sale of a retail shopping center by Alleghany Properties in July 2016. The decrease in other revenue in the first nine months of 2017 from the first nine months of 2016 reflects lower real estate sales activity at Alleghany Properties.

Corporate administration. The negative corporate administration expense in the third quarter of 2017 compared with corporate administration expense in the third quarter of 2016, and the decrease in corporate administration expense in the first nine months of 2017 from the first nine months of 2016, primarily reflect the impact of losses arising from Hurricanes Harvey, Irma and Maria on long-term incentive compensation expense accruals at Alleghany.

Earnings (losses) before income taxes. The earnings before income taxes in the third quarter of 2017 compared with the net losses before income taxes in the third quarter of 2016, and the decrease in losses before income taxes in the first nine months of 2017 from the first nine months of 2016, primarily reflect the impact of losses arising from Hurricanes Harvey, Irma and Maria on long-term incentive compensation expense accruals and net realized capital gains in the third quarter and first nine months of 2017, as explained above.

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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 yet reported, or “IBNR”) and LAE.

	As of September 30, 2017						As of December 31, 2016
	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	$	1,891.3	$	(523.9)	$	1,367.4	$	952.7	$	(106.7)	$	846.0
Casualty & other(1)		7,524.7		(259.9)		7,264.8		7,324.4		(226.0)		7,098.4
		9,416.0		(783.8)		8,632.2		8,277.1		(332.7)		7,944.4
Insurance Segment
Property		581.6		(231.1)		350.5		362.2		(186.8)		175.4
Casualty(2)		2,076.1		(672.7)		1,403.4		2,083.1		(696.0)		1,387.1
Workers’ Compensation		274.2		(1.1)		273.1		241.2		(1.8)		239.4
All other(3)		181.4		(77.6)		103.8		192.1		(87.4)		104.7
		3,113.3		(982.5)		2,130.8		2,878.6		(972.0)		1,906.6
Eliminations		(72.9)		72.9		-		(68.5)		68.5		-
Total	$	12,456.4	$	(1,693.4)	$	10,763.0	$	11,087.2	$	(1,236.2)	$	9,851.0

(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 September 30, 2017 and December 31, 2016. Gross and net loss and LAE reserves, and reinsurance recoverables as of September 30, 2017 increased from December 31, 2016, primarily reflecting significant catastrophe losses. Catastrophe losses, net of reinsurance, in the third quarter and first nine months of 2017 included $264.6 million related to Hurricane Harvey in August 2017, $312.0 million related to Hurricane Irma in September 2017, and $170.3 million related to Hurricane Maria in September 2017, all as discussed above.

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 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 September 30, 2017, our reinsurance and insurance subsidiaries had total reinsurance recoverables of $1,738.4 million, consisting of $1,693.4 million of ceded outstanding loss and LAE and $45.0 million of recoverables on paid losses. See Part I, Item 1,

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“Business—Reinsurance Protection” of the 2016 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 September 30, 2017:

Reinsurer(1)	Rating(2)		Amount		Percentage
			($ in millions)
Swiss Reinsurance Company		A+ (Superior)	$	159.5		9.2%
Syndicates at Lloyd’s of London		A (Excellent)		135.8		7.8%
PartnerRe Ltd		A (Excellent)		122.5		7.0%
Fairfax Financial Holdings Ltd(3)		A (Excellent)		102.0		5.9%
RenaissanceRe Holdings Ltd		A+ (Superior)		99.1		5.7%
Chubb Corporation		A++ (Superior)		89.4		5.1%
W.R. Berkley Corporation		A+ (Superior)		88.3		5.1%
Liberty Mutual		A (Excellent)		72.6		4.2%
Kane SAC Ltd (4)		not rated		70.4		4.0%
Hannover Ruck SE		A+ (Superior)		53.5		3.1%
All other reinsurers				745.3		42.9%
Total reinsurance recoverables(5)			$	1,738.4		100.0%
Secured reinsurance recoverables(4)			$	477.7		27.5%

(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) In July 2017, Fairfax Financial Holdings Ltd acquired Allied World Assurance Company Holdings, AG.

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

(5) Approximately 80 percent of our reinsurance recoverables balance as of September 30, 2017 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 September 30, 2017.

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 2016 Form 10-K for a more complete description of our critical accounting estimates.

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

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of, or substantial investments in, operating companies. As of September 30, 2017, we held total marketable securities and cash of $1,110.3 million, compared with $1,047.4 million as of December 31, 2016. The increase in the nine months ended September 30, 2017 primarily reflects the receipt of dividends from TransRe and RSUI, partially offset by contributions to Alleghany Capital to fund the acquisition of approximately 80 percent of the equity in W&W|AFCO Steel and the 45 percent equity interest in Wilbert, as well as the purchase of certain non-marketable equity investments at the Alleghany parent company. The $1,110.3 million is comprised of $549.4 million at the Alleghany parent company, $533.2 million at AIHL and $27.7 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 September 30, 2017.

Stockholders’ equity attributable to Alleghany stockholders was approximately $8.2 billion as of September 30, 2017, compared with approximately $7.9 billion as of December 31, 2016. The increase in stockholders’ equity in the first nine months of 2017 primarily reflects an increase in unrealized appreciation on our equity and, to a lesser extent, bond portfolios, partially offset by net losses attributable to Alleghany stockholders in the first nine months of 2017. Net losses attributable to Alleghany stockholders in the first nine months of 2017 primarily reflect significant catastrophe losses from Hurricanes Harvey, Irma and Maria at our reinsurance and insurance segments, as discussed above. As of September 30, 2017, we had 15,403,758 shares of our common stock outstanding, compared with 15,410,164 shares of our common stock outstanding as of December 31, 2016.

Sale of Subsidiary. On September 12, 2017, AIHL signed a definitive agreement to sell PacificComp to CopperPoint Mutual Insurance Company (“CopperPoint”) for total cash consideration of approximately $150 million. 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. The transaction, which is subject to customary regulatory review and approvals, is expected to close on December 31, 2017. Upon closing, we expect to record an estimated after-tax gain of approximately $25 million, which amount includes a tax benefit. As of September 30, 2017, PacificComp’s total assets were $440.6 million, consisting primarily of debt securities, and PacificComp’s total liabilities were $313.7 million, consisting primarily of loss and LAE reserves.

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 2016 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 July 31, 2017 through September 30, 2017.

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 July 2014, 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 $350.0 million, or the “2014 Repurchase Program.” In November 2015, our Board of Directors authorized the repurchase, upon the completion of the 2014 Repurchase Program, 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, or the “2015 Repurchase Program.” In the first quarter of 2016, we completed the 2014 Repurchase Program and subsequent repurchases have been made pursuant to the 2015 Repurchase Program. As of September 30, 2017, we had $370.7 million remaining under our share repurchase authorization.

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The following table presents the shares of our common stock that we repurchased in the three and nine months ended September 30, 2017 and 2016 pursuant to the 2014 Repurchase Program and the 2015 Repurchase Program, as applicable:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Shares repurchased		15,916		4,621		15,916		117,721
Cost of shares repurchased (in millions)	$	8.5	$	2.4	$	8.5	$	55.7
Average price per share repurchased	$	537.14	$	517.40	$	537.14	$	472.97

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 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 September 30, 2017, our carrying value in the Pillar Investments, as determined under the equity method of accounting, was $216.7 million, which is net of returns of capital received from the Pillar Investments.

In July 2013, AIHL invested $250.0 million in Ares 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 to limited partner interests in certain Ares subsidiaries that are convertible into an aggregate 5.9 percent interest in Ares common units. These interests may be converted at any time at our discretion. Until we determine to convert our limited partner interests into Ares common units, we classify our investment in Ares as a component of other invested assets and we account for our investment using the equity method of accounting. As of September 30, 2017, AIHL’s carrying value in Ares was $213.9 million, which is net of returns of capital received from Ares.

Investments in Commercial Mortgage Loans. As of September 30, 2017, the carrying value of our commercial mortgage loan portfolio was $649.7 million, representing the unpaid principal balance on the loans. As of September 30, 2017, 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 September 30, 2017, we had holdings in energy sector businesses of $519.3 million, comprised of $319.4 million of debt securities, $50.7 million of equity securities and $149.2 million of Alleghany’s 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 September 30, 2017.

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 and maturities and sales of investments. 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.

With respect to our non-insurance operating subsidiaries, SORC has relied on Alleghany almost entirely to support its operations. From its formation in 2011 through September 30, 2017, we have invested $281.8 million in SORC.

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Included in other activities is debt associated with Alleghany Capital’s operating subsidiaries, which totaled $102.5 million as of September 30, 2017. The $102.5 million includes $31.2 million of borrowings by Jazwares under its available credit facility, $23.0 million of borrowings by W&W|AFCO Steel under its available credit facility and term loans, $17.0 million of debt at Kentucky Trailer related primarily to a mortgage loan, borrowings to finance small acquisitions and borrowings under its available credit facility, $15.9 million of borrowings by IPS under its available credit facility, and $15.4 million of term loans at Bourn & Koch related to borrowings to finance an acquisition. None of these liabilities are guaranteed by Alleghany or Alleghany Capital.

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 September 30, 2017 and December 31, 2016 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 September 30, 2017. The following table presents the ratings of our debt securities portfolio as of September 30, 2017:

	Ratings as of September 30, 2017
	AAA / Aaa		AA / Aa		A		BBB / Baa		Below BBB / Baa or Not-Rated(1)		Total
	($ in millions)
U.S. Government obligations	$	-	$	1,020.7	$	-	$	-	$	-	$	1,020.7
Municipal bonds		549.3		2,574.2		835.6		124.8		47.8		4,131.7
Foreign government obligations		572.6		338.0		210.7		19.6		-		1,140.9
U.S. corporate bonds		4.7		91.0		628.3		995.6		761.4		2,481.0
Foreign corporate bonds		202.9		149.9		543.1		285.5		112.8		1,294.2
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)		15.3		923.6		0.1		7.2		8.0		954.2
Commercial mortgage-backed securities (“CMBS”)		172.4		270.3		66.5		1.4		6.3		516.9
Other asset-backed securities		712.7		234.4		356.8		339.9		29.0		1,672.8
Total debt securities	$	2,229.9	$	5,602.1	$	2,641.1	$	1,774.0	$	965.3	$	13,212.4
Percentage of debt securities		16.9%		42.4%		20.0%		13.4%		7.3%		100.0%

(1) Consists of $223.0 million of securities rated BB / Ba, $286.8 million of securities rated B, $51.5 million of securities rated CCC, $3.2 million of securities rated CC, $3.7 million of securities rated below CC and $397.1 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 available-for-sale, or “AFS.”

Effective duration measures a portfolio’s sensitivity to changes in interest rates. In this regard, as of September 30, 2017, our debt securities portfolio had an effective duration of approximately 4.5 years, approximately the same duration as of December 31, 2016. As of September 30, 2017, approximately $3.5 billion, or 26.6 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.

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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 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 increased to approximately $19.0 billion as of September 30, 2017 from approximately $18.1 billion as of December 31, 2016, primarily reflecting the impact of an increase in unrealized appreciation on our equity portfolio and, to a lesser extent, our bond portfolio, partially offset by the acquisition of approximately 80 percent of the equity in W&W|AFCO Steel.

Fair Value. The following table presents the carrying value and estimated fair value of our consolidated financial instruments as of September 30, 2017 and December 31, 2016:

	September 30, 2017				December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)		$    17,590.2		$    17,590.2		$    16,899.2		$    16,899.2
Liabilities
Senior Notes and other debt(2)		$      1,486.4		$      1,655.5		$      1,476.5		$      1,584.3

(1) This table includes AFS investments (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 2016 Form 10-K for additional information on the senior notes.

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, CMBS, other asset-backed securities (primarily, collateralized loan obligations), U.S. corporate bonds, 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.

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

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 September 30, 2017 and December 31, 2016:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of September 30, 2017
Equity securities:
Common stock		$     3,815.2		$            0.5		$              0.9		$      3,816.6
Preferred stock		-		-		5.0		5.0
Total equity securities		3,815.2		0.5		5.9		3,821.6
Debt securities:
U.S. Government obligations		-		1,020.7		-		1,020.7
Municipal bonds		-		4,131.7		-		4,131.7
Foreign government obligations		-		1,136.2		4.7		1,140.9
U.S. corporate bonds		-		2,202.2		278.8		2,481.0
Foreign corporate bonds		-		1,254.3		39.9		1,294.2
Mortgage and asset-backed securities:
RMBS(1)		-		948.8		5.4		954.2
CMBS		-		505.5		11.4		516.9
Other asset-backed securities(2)		-		490.3		1,182.5		1,672.8
Total debt securities		-		11,689.7		1,522.7		13,212.4
Short-term investments		-		547.8		-		547.8
Other invested assets(3)		-		-		8.4		8.4
Total investments (excluding equity method investments and loans)		$     3,815.2		$    12,238.0		$      1,537.0		$    17,590.2
Senior Notes and other debt		$          -		$      1,553.0		$         102.5		$      1,655.5

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	Level 1		Level 2		Level 3		Total
			($ in millions)
As of December 31, 2016
Equity securities:
Common stock	$	3,105.2	$	-	$	4.3	$	3,109.5
Preferred stock		-		-		-		-
Total equity securities		3,105.2		-		4.3		3,109.5
Debt securities:
U.S. Government obligations		-		1,243.3		-		1,243.3
Municipal bonds		-		4,185.8		-		4,185.8
Foreign government obligations		-		1,047.1		-		1,047.1
U.S. corporate bonds		-		2,120.2		72.9		2,193.1
Foreign corporate bonds		-		1,088.4		0.4		1,088.8
Mortgage and asset-backed securities:
RMBS(1)		-		994.5		5.9		1,000.4
CMBS		-		730.5		4.3		734.8
Other asset-backed securities(2)		-		586.1		903.8		1,489.9
Total debt securities		-		11,995.9		987.3		12,983.2
Short-term investments		-		778.4		-		778.4
Other invested assets(3)		-		-		28.1		28.1
Total investments (excluding equity method investments and loans)	$	3,105.2	$	12,774.3	$	1,019.7	$	16,899.2
Senior Notes and other debt	$	-	$	1,491.5	$	92.8	$	1,584.3

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

(2) Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

(3) Includes partnership and non-marketable equity investments accounted for on an AFS basis, and excludes investments accounted for using the equity method.

Municipal Bonds. The following table provides the fair value of our municipal bonds as of September 30, 2017, 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	$	18.6	$	-	$	-	$	-	$	100.0	$	163.3	$	83.7	$	49.5	$	415.1	$	15.4	$	430.5
California		9.8		46.7		-		9.4		1.3		27.4		113.5		7.5		215.6		99.7		315.3
Texas		13.0		-		0.2		-		26.4		96.5		75.3		2.4		213.8		81.9		295.7
Massachusetts		28.9		24.9		-		-		29.6		40.3		32.3		0.2		156.2		115.9		272.1
Washington		1.2		-		-		-		13.6		21.1		56.6		2.3		94.8		69.1		163.9
Ohio		46.3		1.5		0.2		1.5		2.1		-		49.2		2.2		103.0		59.5		162.5
Colorado		25.1		14.0		-		13.4		8.4		32.1		6.9		2.3		102.2		22.8		125.0
North Carolina		11.4		26.2		1.8		0.3		-		0.5		6.8		9.5		56.5		52.6		109.1
Florida		9.4		0.3		-		-		14.2		32.6		14.7		10.1		81.3		27.6		108.9
Pennsylvania		2.5		0.6		10.4		-		-		41.7		2.2		6.3		63.7		44.9		108.6
All other states		215.6		115.4		26.9		75.3		152.6		191.3		221.2		107.9		1,106.2		323.4		1,429.6
Total	$	381.8	$	229.6	$	39.5	$	99.9	$	348.2	$	646.8	$	662.4	$	200.2	$	2,608.4	$	912.8		3,521.2
Total advance refunded / escrowed maturity bonds																						610.5
Total municipal bonds																					$	4,131.7

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Recent Accounting Standards

Recently Adopted

In May 2015, the Financial Accounting Standards Board, or the “FASB,” issued guidance that requires disclosures related to short-duration insurance contracts. The guidance applies to property and casualty insurance and reinsurance entities, among others, and requires the following annual disclosure related to the liability for loss and LAE: (i) net incurred and paid claims development information by accident year for up to ten years; (ii) a reconciliation of incurred and paid claims development information to the aggregate carrying amount of the liability for loss and LAE; (iii) liabilities for IBNR by accident year and in total; (iv) a description of reserving methodologies (as well as any changes to those methodologies); (v) quantitative information about claim frequency by accident year; and (vi) the average annual percentage payout of incurred claims by age and accident year. In addition, the guidance also requires insurance entities to disclose for annual and interim reporting periods a roll-forward of the liability for loss and LAE. This guidance was effective for annual periods beginning after December 15, 2015 and interim periods within annual periods beginning after December 15, 2016, with early adoption permitted. We adopted this guidance as of December 31, 2016 and the implementation did not have an impact on our results of operations and financial condition. See Note 5 to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q and Note 1(k) and Note 6 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2016 Form 10-K for the new disclosures.

Future Application of Accounting Standards

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 are not impacted by this guidance. This guidance is effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. We will adopt this guidance in the first quarter of 2018 and do not currently believe that the implementation will have a material impact on our results of operations and financial condition.

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) to be measured at fair value with changes in fair value recognized in net income. 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 will adopt this guidance in the first quarter of 2018. As of January 1, 2018, unrealized gains or losses of equity securities, net of deferred taxes, will be reclassified from accumulated other comprehensive income to retained earnings. Subsequently, all changes in unrealized gains or losses of equity securities, net of deferred taxes, will be presented in the Consolidated Statements of Earnings rather than the Consolidated Statements of Comprehensive Income. We do not currently believe that the implementation will have a material impact on our financial condition. See Note 3(a) 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 our unrealized gains and losses of equity securities.

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. 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 2016 Form 10-K for further information on our 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.

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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.

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 will adopt this guidance in the fourth quarter of 2017, and we will record a cumulative effect reduction directly to opening 2017 retained earnings and an offsetting increase in opening 2017 accumulated other comprehensive income at that time. We do not currently believe that the implementation will have a material impact on our results of operations and financial condition.

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 better aligns hedge accounting with 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.

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 also invest in equity securities which are subject to fluctuations in market value. We hold our equity securities and 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. 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 sensitivity analyses as of September 30, 2017 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 September 30, 2017 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.

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	-300		-200		-100		0		100			200			300
	($ in millions)
Assets:
Debt securities, fair value	$	14,546.9	$	14,286.6	$	13,808.3	$	13,212.4	$	12,632.4		$	12,078.8		$	11,556.9
Estimated change in fair value		1,334.5		1,074.2		595.9		-		(580.0	)		(1,133.6	)		(1,655.5	)
Liabilities:
Senior Notes and other debt, fair value	$	2,129.5	$	1,959.9	$	1,795.2	$	1,655.5	$	1,536.8		$	1,434.6		$	1,346.2
Estimated change in fair value		474.0		304.4		139.7		-		(118.7	)		(220.9	)		(309.3	)

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 September 30, 2017 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 September 30, 2017
($ in millions)
Estimated               Fair Value	Hypothetical                 Price Change	Estimated Fair Value After Hypothetical   Change in Price	Hypothetical Percentage Increase (Decrease) in   Stockholders’ Equity
$          3,821.6	20% Increase	$            4,585.9	6.1%
	20% Decrease	$            3,057.3	(6.1%)

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 as AFS or using the equity method, and had a carrying value of $338.0 million as of September 30, 2017.

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, and we have recently initiated a hedging program that is designed to reduce this risk for a portion of our exposure to certain currencies. As of September 30, 2017, 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 September 30, 2017 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 September 30, 2017
($ in millions)
Estimated             Fair Value	Hypothetical                 Price Change	Estimated Fair Value After Hypothetical   Change in Price	Hypothetical Percentage Increase (Decrease) in   Stockholders’ Equity
$          223.7 (1)	20% Increase	$            268.4	0.4%
	20% Decrease	$            179.0	(0.4%)

(1) Denotes a net asset position as of September 30, 2017.

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

67

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 September 30, 2017 in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

68

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 2016 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 2016 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 September 30, 2017:

	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)
July 1 to July 31		-	$	-		-	$	379.2
August 1 to August 31		-		-		-		379.2
September 1 to September 30		15,916		537.14		15,916		370.7
Total		15,916		537.14		15,916

  (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.

Item 4. Mine Safety Disclosures.

The information concerning mine safety violations or other regulatory matters required by SEC regulations is included in Exhibit 95 to this Form 10-Q.

69

Item 6. Exhibits.

Exhibit     Number	Description
10.1(a)	Credit Agreement, dated as of July  31, 2017, among Alleghany Corporation, the Lenders which are signatories thereto and U.S. Bank National Association, as administrative agent for the Lenders, filed as Exhibit 10.1(a) to Alleghany’s Current Report on Form 8-K filed on August 1, 2017, is incorporated herein by reference.
10.1(b)	List of Contents of Exhibits and Schedules to the Credit Agreement, filed as Exhibit 10.1(b) to Alleghany’s Current Report on Form 8-K filed on August 1, 2017, is incorporated herein by reference. Alleghany agrees to furnish supplementally a copy of any omitted exhibit or schedule to the Securities and Exchange Commission upon request.
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.
95	Mine Safety Disclosure required under Item 104 of Regulation S-K.
101	Interactive Data Files formatted in XBRL (Extensible Business Reporting Language): (i) Consolidated Balance Sheets as of September 30, 2017 and December 31, 2016; (ii) Consolidated Statements of Earnings and Comprehensive Income for the three and nine months ended September 30, 2017 and 2016; (iii) Consolidated Statements of Cash Flows for the nine months ended September 30, 2017 and 2016; and (iv) Notes to Unaudited Consolidated Financial Statements.

70

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: November 2, 2017	By:	/s/ John L. Sennott, Jr.
		John L. Sennott, Jr. Senior Vice President and chief financial officer (principal financial officer)

71

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: November 2, 2017

/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: November 2, 2017

/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 September 30, 2017, 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: November 2, 2017	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 September 30, 2017, 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: November 2, 2017	By:	/s/ John L. Sennott, Jr.
		John L. Sennott, Jr.
		Senior Vice President and chief financial officer

EX-95

Exhibit 95

MINE SAFETY DISCLOSURE

Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K (17 CFR § 229.104) require issuers that are operators, or that have a subsidiary that is an operator, of a coal or other mine to disclose certain information regarding specified health and safety violations, orders and citations, related civil penalty assessments, related legal actions and mining-related fatalities.

Wilson County Holdings LLC (“WCH”), a wholly-owned subsidiary of Alleghany Corporation through Stranded Oil Resources Corporation, operates a facility in Fredonia, Kansas (the “Fredonia Facility”) that is regulated by the federal Mine Safety and Health Administration (“MSHA”). MSHA has classified the operations at the Fredonia Facility as “oil mining” and subject to MSHA jurisdiction under the Federal Mine Safety and Health Act of 1977 (“Mine Safety Act”).

The Mine Safety Act requires MSHA to thoroughly inspect mining facilities on a regular basis and to issue a citation or otherwise take enforcement against a mine operator if an inspector or authorized representative believes that any violation of the Mine Safety Act or MSHA’s standards or regulations has occurred.

Liability under the Mine Safety Act is strict. Operators subject to MSHA jurisdiction are generally liable under the Mine Safety Act for violations of the Mine Safety Act or the standards and regulations promulgated under the Mine Safety Act, regardless of fault. Whenever MSHA issues a citation or order, it generally proposes a civil penalty that the operator is ordered to pay. Mine operators may contest citations, orders and proposed assessments before the Federal Mine Safety and Health Review Commission, an independent adjudicatory agency.

The table below contains information for the reporting period concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K (17 CFR 229.104).

Subsidiary Name/Mine I.D. Number

Section 104(a) S&S   Citations1

Section 104(b)  Orders2

Section 104(d)  Orders3

Section 110(b)(2)  Violations4

Section 107(a)  Orders5

Total Dollar Value of MSHA Assessments Proposed (Actual  Amount)

Total Number of  Mining Related  Fatalities

Received Notice of Pattern of Violations  under Section 104(e)   (Yes/No)6

Legal Actions Pending  as of Last Day of   Period

Legal Actions Initiated During   Period

Legal Actions Resolved  During   Period7

Wilson County Holdings LLC

-

-

-

-

-

$ -

-

No

-

1

Mine I.D. No. 1401756

¹ Section 104(a) S&S citations are alleged violations of mandatory health or safety standards that could significantly and substantially contribute to a mine health and safety hazard.

²  Section 104(b) orders are alleged failures to abate or correct an alleged violation within the period of time specified in the citation or order.

³  Section 104(d) citations and orders are issued for alleged unwarrantable failures – aggravated conduct constituting more than ordinary negligence – to comply with mandatory safety or health standards.

⁴  Section 110(b)(2) violations are issued for alleged “flagrant” failures – reckless or repeated failures – to make reasonable efforts to eliminate a known violation of a mandatory safety or health standard that substantially proximately caused, or reasonably could have been expected to cause, death or serious bodily injury.

⁵  Section 107(a) imminent danger orders are issued for alleged conditions or practices which could reasonably be expected to cause death or serious physical harm before such condition or practice can be abated. A Section 107(a) order requires an operator to immediately withdraw miners from the area of the mine affected by the condition.

⁶  Section 104(e) written notices are served when MSHA determines that a mine operator has demonstrated a pattern of violating mandatory health or safety standards that could significantly and substantially contribute to a mine safety or health hazard.

⁷  The parties reached an agreement in Docket No. CENT 2017-0134. Docket No. CENT 2017-0134 was a civil penalty proceeding involving four citations issued in October of 2016 (Citation Nos. 8936992, 8936991, 8936996, 8936993). MSHA agreed to modify Citation No. 8936993 to non-S&S, and the other three citations were accepted as written.

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 26, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
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		15,389,970

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale securities at fair value:
Equity securities (cost: 2017 - $3,174,837; 2016 - $2,816,572)	$ 3,821,601	$ 3,109,523
Debt securities (amortized cost: 2017 - $13,027,581; 2016 - $12,927,103)	13,212,395	12,983,213
Short-term investments	547,787	778,410
Marketable Securities, Total	17,581,783	16,871,146
Other invested assets	739,339	645,245
Total investments	18,970,822	18,111,269
Cash	701,841	594,091
Accrued investment income	107,095	113,763
Premium balances receivable	877,780	743,692
Reinsurance recoverables	1,738,391	1,272,219
Ceded unearned premiums	208,391	201,023
Deferred acquisition costs	476,634	448,634
Property and equipment at cost, net of accumulated depreciation and amortization	130,524	112,920
Goodwill	333,748	284,974
Intangible assets, net of amortization	464,956	378,680
Current taxes receivable	83,634	25,950
Net deferred tax assets	266,267	354,852
Funds held under reinsurance agreements	685,824	591,602
Other assets	668,328	522,922
Total assets	25,714,235	23,756,591
Liabilities, Redeemable Noncontrolling Interests and Stockholders' Equity
Loss and loss adjustment expenses	12,456,375	11,087,199
Unearned premiums	2,295,954	2,175,498
Senior Notes and other debt	1,486,375	1,476,489
Reinsurance payable	143,283	90,659
Other liabilities	1,027,746	912,081
Total liabilities	17,409,733	15,741,926
Redeemable noncontrolling interests	103,479	74,720
Common stock (shares authorized: 2017 and 2016 - 22,000,000; shares issued: 2017 and 2016 - 17,459,961)	17,460	17,460
Contributed capital	3,611,900	3,611,993
Accumulated other comprehensive income	438,403	109,284
Treasury stock, at cost (2017 - 2,056,203 shares; 2016 - 2,049,797 shares)	(817,618)	(812,840)
Retained earnings	4,950,878	5,014,048
Total stockholders' equity attributable to Alleghany stockholders	8,201,023	7,939,945
Total liabilities, redeemable noncontrolling interest and stockholders' equity	25,714,235	23,756,591
Commercial Mortgage Loan Portfolio
Available-for-sale securities at fair value:
Commercial mortgage loans	$ 649,700	$ 594,878

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Equity securities, cost	$ 3,174,837	$ 2,816,572
Debt securities, amortized cost	$ 13,027,581	$ 12,927,103
Common stock, Shares authorized	22,000,000	22,000,000
Common stock, Shares issued	17,459,961	17,459,961
Treasury stock, shares	2,056,203	2,049,797

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Consolidated Statements of Earnings and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Net premiums earned	$ 1,239,721	$ 1,253,515	$ 3,692,838	$ 3,736,596
Net investment income	104,663	120,603	321,857	332,326
Net realized capital gains	32,921	27,221	101,840	117,126
Other than temporary impairment losses	(6,131)	(11,729)	(13,095)	(38,216)
Other revenue	296,309	225,006	650,413	527,765
Total revenues	1,667,483	1,614,616	4,753,853	4,675,597
Costs and Expenses
Net loss and loss adjustment expenses	1,491,848	718,556	2,926,039	2,198,512
Commissions, brokerage and other underwriting expenses	398,163	423,042	1,220,415	1,238,712
Other operating expenses	277,918	228,408	678,226	575,527
Corporate administration	(4,689)	10,745	26,601	33,938
Amortization of intangible assets	5,765	6,008	14,140	14,490
Interest expense	20,804	20,682	62,728	61,384
Total costs and expenses	2,189,809	1,407,441	4,928,149	4,122,563
(Losses) earnings before income taxes	(522,326)	207,175	(174,296)	553,034
Income taxes	(212,379)	48,328	(116,368)	162,274
Net (losses) earnings	(309,947)	158,847	(57,928)	390,760
Net earnings attributable to noncontrolling interest	4,210	3,016	5,242	3,353
Net (losses) earnings attributable to Alleghany stockholders	(314,157)	155,831	(63,170)	387,407
Net (losses) earnings	(309,947)	158,847	(57,928)	390,760
Other comprehensive (loss) income :
Change in unrealized gains (losses), net of deferred taxes of $52,766 and $25,123 for 2017 and 2016, for the three months ended and $196,336 and $128,379 for 2017 and 2016, for the nine months ended respectively	97,994	46,657	364,623	238,418
Less: reclassification for net realized capital gains and other than temporary impairment losses, net of taxes of ($9,377) and ($5,422) for 2017 and 2016, for the three months ended and ($31,061) and ($22,999) for 2017 and 2016, for the nine months ended respectively	(17,414)	(10,070)	(57,684)	(42,712)
Change in unrealized currency translation adjustment, net of deferred taxes of $3,967 and ($1,637) for 2017 and 2016, for the three months ended and $12,050 and $10,318 for 2017 and 2016, for the nine months ended respectively	7,368	(3,041)	22,379	19,162
Retirement plans	98	95	(199)	452
Comprehensive (loss) income	(221,901)	192,488	271,191	606,080
Comprehensive income attributable to noncontrolling interest	4,210	3,016	5,242	3,353
Comprehensive (loss) income attributable to Alleghany stockholders	$ (226,111)	$ 189,472	$ 265,949	$ 602,727
Basic (losses) earnings per share attributable to Alleghany stockholders	$ (20.38)	$ 10.09	$ (4.10)	$ 25.09
Diluted (losses) earnings per share attributable to Alleghany stockholders	$ (20.90)	$ 10.09	$ (4.10)	$ 25.08

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Consolidated Statements of Earnings and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Change in unrealized gains (losses), deferred taxes	$ 52,766	$ 25,123	$ 196,336	$ 128,379
Reclassification for net realized capital gains and other than temporary impairment losses, taxes	(9,377)	(5,422)	(31,061)	(22,999)
Change in unrealized currency translation adjustment, deferred taxes	$ 3,967	$ (1,637)	$ 12,050	$ 10,318

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net (losses) earnings	$ (57,928)	$ 390,760
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	106,197	115,020
Net realized capital (gains) losses	(101,840)	(117,126)
Other than temporary impairment losses	13,095	38,216
(Increase) decrease in reinsurance recoverables, net of reinsurance payable	(413,548)	73,781
(Increase) decrease in premium balances receivable	(134,088)	(44,341)
(Increase) decrease in ceded unearned premiums	(7,368)	(17,588)
(Increase) decrease in deferred acquisition costs	(28,000)	(39,962)
(Increase) decrease in funds held under reinsurance agreements	(94,222)	(299,372)
Increase (decrease) in unearned premiums	120,456	164,078
Increase (decrease) in loss and loss adjustment expenses	1,369,176	258,861
Change in unrealized foreign exchange losses (gains)	(134,404)	78,615
Other, net	(211,479)	(27,283)
Net adjustments	483,975	182,899
Net cash provided by (used in) operating activities	426,047	573,659
Cash flows from investing activities
Purchases of debt securities	(4,181,182)	(4,665,980)
Purchases of equity securities	(3,218,941)	(1,163,687)
Sales of debt securities	2,836,272	3,953,367
Maturities and redemptions of debt securities	1,397,408	996,548
Sales of equity securities	2,970,760	1,197,612
Net (purchases) sales of short-term investments	174,501	(417,186)
Net (purchases) sales and maturities of commercial mortgage loans	(54,822)	(336,944)
(Purchases) sales of property and equipment	10,268	(18,982)
Purchases of affiliates and subsidiaries, net of cash acquired	(244,311)	(145,253)
Other, net	28,302	128,731
Net cash provided by (used in) investing activities	(281,745)	(471,774)
Cash flows from financing activities
Treasury stock acquisitions	(8,549)	(55,678)
Increase (decrease) in other debt	(27,202)	43,135
Other, net	(17,070)	(4,274)
Net cash provided by (used in) financing activities	(52,821)	(16,817)
Effect of exchange rate changes on cash	16,269	8,572
Net increase (decrease) in cash	107,750	93,640
Cash at beginning of period	594,091	475,267
Cash at end of period	701,841	568,907
Cash paid during period for:
Interest paid	58,133	56,423
Income taxes paid (refund received)	$ 29,320	$ 51,969

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Summary of Significant Accounting Principles

9 Months Ended

Sep. 30, 2017

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, 2016 (the “2016 Form 10-K”) and the Quarterly Reports on Form 10-Q for the quarters ended March 31, 2017 and June 30, 2017 of Alleghany Corporation (“Alleghany”).

Alleghany, 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 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”), CapSpecialty, Inc. (“CapSpecialty”) and Pacific Compensation Corporation (“PacificComp”). CapSpecialty has been a subsidiary of AIHL since January 2002, RSUI has been a subsidiary of AIHL since July 2003 and PacificComp has been a subsidiary of AIHL since July 2007. AIHL Re LLC (“AIHL Re”), a captive reinsurance company which provides reinsurance to Alleghany’s insurance operating subsidiaries and affiliates, has been a wholly-owned subsidiary of Alleghany since its formation in May 2006. Alleghany’s reinsurance operations commenced on March 6, 2012 when Alleghany consummated a merger with Transatlantic Holdings, Inc. (“TransRe”) and TransRe became one of Alleghany’s wholly-owned subsidiaries.

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 capital investments primarily through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s investments are included in other activities for segment reporting purposes and include:

• Stranded Oil Resources Corporation (“SORC”), an exploration and production company focused on enhanced oil recovery, headquartered in Golden, Colorado;

• 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 engineering-focused 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, acquired on April 28, 2017; 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, acquired on August 1, 2017. Wilbert is accounted for under the equity method of accounting and is included in other invested assets.

On April 15, 2016, Alleghany Capital acquired an additional 50 percent of Jazwares’ outstanding equity, bringing its equity ownership interest to 80 percent and, as of that date, the results of Jazwares have been included in Alleghany’s consolidated results. Prior to April 15, 2016, Jazwares was accounted for under the equity method of accounting.

In addition, Alleghany owns and manages properties in the Sacramento, California region through its wholly-owned subsidiary Alleghany Properties Holdings LLC (“Alleghany Properties”). Alleghany’s public equity investments are managed primarily through Alleghany’s wholly-owned subsidiary Roundwood Asset Management LLC.

On September 12, 2017, AIHL signed a definitive agreement to sell PacificComp to CopperPoint Mutual Insurance Company (“CopperPoint”) for total cash consideration of approximately $150 million. 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. The transaction, which is subject to customary regulatory review and approvals, is expected to close on December 31, 2017. Upon closing, Alleghany expects to record an estimated after-tax gain of approximately $25 million, which amount includes a tax benefit. As of September 30, 2017, PacificComp’s total assets were $440.6 million, consisting primarily of debt securities, and PacificComp’s total liabilities were $313.7 million, consisting primarily of loss and loss adjustment expenses (“LAE”) reserves.

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 accumulated other 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 nine months of 2017, Bourn & Koch had approximately 11 percent noncontrolling interests outstanding, Kentucky Trailer had approximately 21 percent noncontrolling interests outstanding, IPS had approximately 16 percent noncontrolling interests outstanding and Jazwares had approximately 20 percent noncontrolling interests outstanding. W&W|AFCO Steel had approximately 20 percent noncontrolling interests outstanding from its April 28, 2017 acquisition date through September 30, 2017.

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 2016 Form 10-K.

(c) Recent Accounting Standards

Recently Adopted

In May 2015, the Financial Accounting Standards Board (the “FASB”) issued guidance that requires disclosures related to short-duration insurance contracts. The guidance applies to property and casualty insurance and reinsurance entities, among others, and requires the following annual disclosure related to the liability for loss and LAE: (i) net incurred and paid claims development information by accident year for up to ten years; (ii) a reconciliation of incurred and paid claims development information to the aggregate carrying amount of the liability for loss and LAE; (iii) liabilities for losses that have been incurred but not yet reported by accident year and in total; (iv) a description of reserving methodologies (as well as any changes to those methodologies); (v) quantitative information about claim frequency by accident year; and (vi) the average annual percentage payout of incurred claims by age and accident year. In addition, the guidance also requires insurance entities to disclose for annual and interim reporting periods a roll-forward of the liability for loss and LAE. This guidance was effective for annual periods beginning after December 15, 2015 and interim periods within annual periods beginning after December 15, 2016, with early adoption permitted. Alleghany adopted this guidance as of December 31, 2016 and the implementation did not have an impact on its results of operations and financial condition. See Note 5 of this Form 10-Q and Note 1(k) and Note 6 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2016 Form 10-K for the new disclosures.

Future Application of Accounting Standards

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 are not impacted by this guidance. This guidance is effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany will adopt this guidance in the first quarter of 2018 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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) to be measured at fair value with changes in fair value recognized in net income. 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 will adopt this guidance in the first quarter of 2018. As of January 1, 2018, unrealized gains or losses of equity securities, net of deferred taxes, will be reclassified from accumulated other comprehensive income to retained earnings. Subsequently, all changes in unrealized gains or losses of equity securities, net of deferred taxes, will be presented in the Consolidated Statements of Earnings rather than the Consolidated Statements of Comprehensive Income. Alleghany does not currently believe that the implementation will have a material impact on its financial condition. See Note 3(a) of this Form 10-Q for further information on Alleghany’s unrealized gains and losses of equity securities.

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 2016 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.

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 will adopt this guidance in the fourth quarter of 2017, and will record a cumulative effect reduction directly to opening 2017 retained earnings and an offsetting increase in opening 2017 accumulated other comprehensive income at that time. Alleghany does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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 better aligns hedge accounting with 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

9 Months Ended

Sep. 30, 2017

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 September 30, 2017 and December 31, 2016:

	September 30, 2017				December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	17,590.2	$	17,590.2	$	16,899.2	$	16,899.2
Liabilities
Senior Notes and other debt(2)	$	1,486.4	$	1,655.5	$	1,476.5	$	1,584.3

(1) This table includes AFS investments (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 2016 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 September 30, 2017 and December 31, 2016:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of September 30, 2017
Equity securities:
Common stock	$	3,815.2	$	0.5	$	0.9	$	3,816.6
Preferred stock		-		-		5.0		5.0
Total equity securities		3,815.2		0.5		5.9		3,821.6
Debt securities:
U.S. Government obligations		-		1,020.7		-		1,020.7
Municipal bonds		-		4,131.7		-		4,131.7
Foreign government obligations		-		1,136.2		4.7		1,140.9
U.S. corporate bonds		-		2,202.2		278.8		2,481.0
Foreign corporate bonds		-		1,254.3		39.9		1,294.2
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		-		948.8		5.4		954.2
Commercial mortgage-backed securities (“CMBS”)		-		505.5		11.4		516.9
Other asset-backed securities(2)		-		490.3		1,182.5		1,672.8
Total debt securities		-		11,689.7		1,522.7		13,212.4
Short-term investments		-		547.8		-		547.8
Other invested assets(3)		-		-		8.4		8.4
Total investments (excluding equity method investments and loans)	$	3,815.2	$	12,238.0	$	1,537.0	$	17,590.2
Senior Notes and other debt	$	-	$	1,553.0	$	102.5	$	1,655.5
	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2016
Equity securities:
Common stock	$	3,105.2	$	-	$	4.3	$	3,109.5
Preferred stock		-		-		-		-
Total equity securities		3,105.2		-		4.3		3,109.5
Debt securities:
U.S. Government obligations		-		1,243.3		-		1,243.3
Municipal bonds		-		4,185.8		-		4,185.8
Foreign government obligations		-		1,047.1		-		1,047.1
U.S. corporate bonds		-		2,120.2		72.9		2,193.1
Foreign corporate bonds		-		1,088.4		0.4		1,088.8
Mortgage and asset-backed securities:
RMBS(1)		-		994.5		5.9		1,000.4
CMBS		-		730.5		4.3		734.8
Other asset-backed securities(2)		-		586.1		903.8		1,489.9
Total debt securities		-		11,995.9		987.3		12,983.2
Short-term investments		-		778.4		-		778.4
Other invested assets(3)		-		-		28.1		28.1
Total investments (excluding equity method investments and  loans)	$	3,105.2	$	12,774.3	$	1,019.7	$	16,899.2
Senior Notes and other debt	$	-	$	1,491.5	$	92.8	$	1,584.3

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

(2) Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

(3) Includes partnership and non-marketable equity investments accounted for on an AFS basis, and excludes investments accounted for using the equity method.

In the nine months ended September 30, 2017, Alleghany transferred $7.2 million of financial instruments out of Level 3 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. There were no transfers of financial instruments out of Level 3 in the third quarter of 2017.

In the three and nine months ended September 30, 2017, Alleghany transferred $0.8 million and $5.5 million, respectively, of financial instruments into Level 3 principally due to a decrease in observable inputs related to the valuation of such assets and, specifically, a decrease in broker quotes. Of the $5.5 million of transfers, $3.8 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 nine months ended September 30, 2017.

In the three and nine months ended September 30, 2016, Alleghany transferred $5.1 million and $5.4 million, respectively, of debt securities out of Level 3 principally due to an increase in observable inputs related to the valuation of such assets and, specifically, an increase in broker quotes. Of the $5.4 million of transfers, $5.1 million related to U.S. corporate bonds and $0.3 million related to other invested assets.

In the three and nine months ended September 30, 2016, Alleghany transfered $5.7 million and $8.4 million, respectively, of securities into Level 3 principally due to a decrease in observable inputs related to the valuation of such assets, and specifically, a decrease in broker quotes. Of the $8.4 million of transfers, $5.5 million related to U.S. corporate bonds, $1.9 million related to foreign corporate bonds and $1.0 million related to common stock. There were no other material transfers between Levels 1, 2 or 3 in the three and nine months ended September 30, 2016.

The following tables present reconciliations of the changes during the nine months ended September 30, 2017 and 2016 in Level 3 assets measured at fair value:

	Equity Securities				Debt Securities
											Mortgage and asset-backed
Nine Months Ended September 30, 2017	Common   Stock		Preferred   Stock		Foreign  Government  Obligations		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)		0.2		(0.2)		-		(0.2)		-		0.2		-		3.9		10.8		14.7
Other comprehensive income		-		0.2		-		3.2		0.8		0.3		0.1		15.0		(8.9)		10.7
Purchases		-		5.6		4.7		220.4		38.6		-		9.6		746.7		-		1,025.6
Sales		(2.6)		(0.6)		-		(10.2)		(0.2)		-		(2.2)		(59.5)		(21.6)		(96.9)
Issuances		-		-		-		-		-		-		-		-		-		-
Settlements		-		-		-		(6.3)		-		(1.0)		(0.4)		(427.4)		-		(435.1)
Transfers into Level 3		1.4		-		-		3.8		0.3		-		-		-		-		5.5
Transfers out of Level 3		(2.4)		-		-		(4.8)		-		-		-		-		-		(7.2)
Balance as of September 30, 2017	$	0.9	$	5.0	$	4.7	$	278.8	$	39.9	$	5.4	$	11.4	$	1,182.5	$	8.4	$	1,537.0

			Debt Securities
							Mortgage and asset-backed
Nine Months Ended September 30, 2016	Common     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, 2016	$	-	$	49.8	$	-	$	14.9	$	20.2	$	953.0	$	29.9	$	1,067.8
Net realized/unrealized gains (losses) included in:
Net earnings(2)		(0.1)		(0.5)		-		0.3		(0.1)		2.2		4.2		6.0
Other comprehensive income		1.8		1.4		-		(0.7)		0.8		25.1		(2.9)		25.5
Purchases		2.2		39.4		-		-		-		32.1		-		73.7
Sales		-		(14.5)		-		(7.0)		(8.2)		(70.7)		(4.2)		(104.6)
Issuances		-		-		-		-		-		-		-		-
Settlements		-		(1.7)		-		(1.5)		(0.5)		(33.6)		-		(37.3)
Transfers into Level 3		1.0		5.5		1.9		-		-		-		-		8.4
Transfers out of Level 3		-		(5.1)		-		-		-		-		(0.3)		(5.4)
Balance as of September 30, 2016	$	4.9	$	74.3	$	1.9	$	6.0	$	12.2	$	908.1	$	26.7	$	1,034.1

(1) Includes partnership and non-marketable equity investments accounted for on an AFS basis.

(2) There were no other than temporary impairment (“OTTI”) losses recorded in net earnings related to Level 3 assets still held as of September 30, 2017 and 2016.

Net unrealized losses related to Level 3 assets as of September 30, 2017 and December 31, 2016 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 2016 Form 10-K for Alleghany’s accounting policy on fair value.

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Investments

9 Months Ended

Sep. 30, 2017

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 September 30, 2017 and December 31, 2016:

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	($ in millions)
As of September 30, 2017
Equity securities:
Common stock	$	3,170.0	$	662.8	$	(16.2)	$	3,816.6
Preferred stock		4.8		0.2		-		5.0
Total equity securities		3,174.8		663.0		(16.2)		3,821.6
Debt securities:
U.S. Government obligations		1,033.1		1.6		(14.0)		1,020.7
Municipal bonds		4,039.6		106.9		(14.8)		4,131.7
Foreign government obligations		1,134.6		14.0		(7.7)		1,140.9
U.S. corporate bonds		2,425.6		63.6		(8.2)		2,481.0
Foreign corporate bonds		1,270.5		27.1		(3.4)		1,294.2
Mortgage and asset-backed securities:
RMBS		953.9		7.7		(7.4)		954.2
CMBS		509.2		10.0		(2.3)		516.9
Other asset-backed securities(1)		1,661.1		13.4		(1.7)		1,672.8
Total debt securities		13,027.6		244.3		(59.5)		13,212.4
Short-term investments		547.8		-		-		547.8
Total investments	$	16,750.2	$	907.3	$	(75.7)	$	17,581.8
	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	($ in millions)
As of December 31, 2016
Equity securities:
Common stock	$	2,816.6	$	332.1	$	(39.2)	$	3,109.5
Preferred stock		-		-		-		-
Total equity securities		2,816.6		332.1		(39.2)		3,109.5
Debt securities:
U.S. Government obligations		1,265.7		2.2		(24.6)		1,243.3
Municipal bonds		4,161.0		66.9		(42.1)		4,185.8
Foreign government obligations		1,030.9		20.2		(4.0)		1,047.1
U.S. corporate bonds		2,168.9		43.5		(19.3)		2,193.1
Foreign corporate bonds		1,068.3		27.3		(6.8)		1,088.8
Mortgage and asset-backed securities:
RMBS		1,005.9		7.0		(12.5)		1,000.4
CMBS		728.8		9.6		(3.6)		734.8
Other asset-backed securities(1)		1,497.6		4.0		(11.7)		1,489.9
Total debt securities		12,927.1		180.7		(124.6)		12,983.2
Short-term investments		778.4		-		-		778.4
Total investments	$	16,522.1	$	512.8	$	(163.8)	$	16,871.1

(1) Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

(b) Contractual Maturity

The amortized cost or cost and estimated fair value of debt securities by contractual maturity as of September 30, 2017 are presented below. 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 September 30, 2017
Short-term investments due in one year or less	$	547.8	$	547.8
Mortgage and asset-backed securities(1)		3,124.2		3,143.9
Debt securities with maturity dates:
One year or less		385.2		386.1
Over one through five years		3,089.6		3,124.6
Over five through ten years		3,359.4		3,414.9
Over ten years		3,069.2		3,142.9
Total debt securities		13,027.6		13,212.4
Equity securities		3,174.8		3,821.6
Total	$	16,750.2	$	17,581.8

(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 nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions)
Interest income	$	104.6	$	99.0	$	306.3	$	299.0
Dividend income		6.7		12.2		27.9		35.5
Investment expenses		(5.8)		(6.2)		(20.1)		(19.8)
Equity in results of Pillar Investments(1)		(9.4)		5.9		(2.9)		12.9
Equity in results of Ares(1)		6.9		4.6		(0.4)		5.1
Other investment results		1.7		5.1		11.1		(0.4)
Total	$	104.7	$	120.6	$	321.9	$	332.3

(1) See Note 3(g) of this Form 10-Q for discussion of the Pillar Investments and the investment in Ares, each as defined therein.

As of September 30, 2017, non-income producing invested assets were immaterial.

(d) Realized Gains and Losses

The proceeds from sales of AFS securities were $1.6 billion and $0.8 billion for the three months ended September 30, 2017 and 2016, respectively, and $5.8 billion and $5.2 billion for the nine months ended September 30, 2017 and 2016, respectively.

Realized capital gains and losses for the three and nine months ended September 30, 2017 primarily reflect sales of equity securities and certain exchange-traded funds. Realized capital gains in the first nine months of 2017 include the sale of certain equity securities resulting from a partial restructuring of the equity portfolio. Realized capital gains and losses for the three and nine months ended September 30, 2016 primarily reflect sales of equity and debt securities. In addition, Alleghany Capital recognized a gain of $13.2 million on April 15, 2016 in connection with the acquisition of an additional 50 percent equity ownership in Jazwares, when its pre-existing 30 percent equity ownership was remeasured at estimated fair value (the “Jazwares Remeasurement Gain”).

The following table presents amounts of gross realized capital gains and gross realized capital losses for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions)
Gross realized capital gains	$	47.0	$	32.7	$	189.7	$	217.7
Gross realized capital losses		(14.1)		(5.5)		(87.9)		(100.6)
Net realized capital gains	$	32.9	$	27.2	$	101.8	$	117.1

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

(e) OTTI Losses

Alleghany holds its equity and debt securities as AFS and, as such, these securities are recorded at fair value. Alleghany continually monitors the difference between cost and the estimated fair value of its equity and 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 cost-basis or 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.

Management’s assessment of equity securities initially involves an evaluation of all securities that are in an unrealized loss position, regardless of the duration or severity of the loss, as of the applicable balance sheet date. Such initial review consists primarily of assessing whether: (i) there has been a negative credit or news event with respect to the issuer that could indicate the existence of an OTTI; and (ii) Alleghany has the ability and intent to hold an equity security for a period of time sufficient to allow for an anticipated recovery (generally considered to be 12 months from the balance sheet date).

To the extent that an equity security in an unrealized loss position is not impaired based on the initial review described above, Alleghany then further evaluates such equity security and deems it to be other than temporarily impaired if it has been in an unrealized loss position for 12 months or more or if its unrealized loss position is greater than 50 percent of its cost, absent compelling evidence to the contrary.

Alleghany then evaluates those equity securities where the unrealized loss is at least 20 percent of cost as of the balance sheet date or that have been in an unrealized loss position continuously for six months or more preceding the balance sheet date. This evaluation takes into account quantitative and qualitative factors in determining whether such securities are other than temporarily impaired including: (i) market valuation metrics associated with the equity security (such as dividend yield and price-to-earnings ratio); (ii) current views on the equity security, as expressed by either Alleghany’s internal stock analysts and/or by third-party stock analysts or rating agencies; and (iii) credit or news events associated with a specific issuer, such as negative news releases and rating agency downgrades with respect to the issuer of the equity security.

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 nine months of 2017 reflect $13.1 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $13.1 million of OTTI losses, $11.8 million related to equity securities, primarily in the retail sector, and $1.3 million related to debt securities. The determination that unrealized losses on equity and debt 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 $13.1 million of OTTI losses, $6.1 million was incurred in the third quarter of 2017.

OTTI losses in the first nine months of 2016 reflect $38.2 million of unrealized losses that were deemed to be other than temporary and, as such, were required to be charged against earnings. Of the $38.2 million of OTTI losses, $16.6 million related to equity securities, primarily in the retail, financial services, technology and chemical sectors, and $21.6 million related to debt securities, primarily in the energy sector. The determination that unrealized losses on equity and debt securities were other than temporary was primarily due to the severity and duration of the decline in the fair value of equity and debt securities relative to their costs. Of the $38.2 million of OTTI losses, $11.7 million was incurred in the third quarter of 2016.

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 September 30, 2017 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.

(f) Aging of Gross Unrealized Losses

The following tables present gross unrealized losses and related fair values for equity securities and debt securities, grouped by duration of time in a continuous unrealized loss position, as of September 30, 2017 and December 31, 2016:

	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 September 30, 2017
Equity securities:
Common stock	$	998.5	$	16.2	$	-	$	-	$	998.5	$	16.2
Preferred stock		-		-		-		-		-		-
Total equity securities		998.5		16.2		-		-		998.5		16.2
Debt securities:
U.S. Government obligations		626.0		5.9		242.9		8.1		868.9		14.0
Municipal bonds		404.5		2.5		358.4		12.3		762.9		14.8
Foreign government obligations		408.2		4.9		76.0		2.8		484.2		7.7
U.S. corporate bonds		399.3		5.0		206.3		3.2		605.6		8.2
Foreign corporate bonds		236.6		1.6		117.3		1.8		353.9		3.4
Mortgage and asset-backed securities:
RMBS		429.7		4.7		132.8		2.7		562.5		7.4
CMBS		24.8		0.2		41.8		2.1		66.6		2.3
Other asset-backed securities		232.5		0.7		90.8		1.0		323.3		1.7
Total debt securities		2,761.6		25.5		1,266.3		34.0		4,027.9		59.5
Total temporarily impaired securities	$	3,760.1	$	41.7	$	1,266.3	$	34.0	$	5,026.4	$	75.7
	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, 2016
Equity securities:
Common stock	$	619.4	$	39.2	$	-	$	-	$	619.4	$	39.2
Preferred stock		-		-		-		-		-		-
Total equity securities		619.4		39.2		-		-		619.4		39.2
Debt securities:
U.S. Government obligations		975.0		24.6		-		-		975.0		24.6
Municipal bonds		1,464.5		39.7		41.6		2.4		1,506.1		42.1
Foreign government obligations		238.3		4.0		-		-		238.3		4.0
U.S. corporate bonds		727.9		18.1		52.6		1.2		780.5		19.3
Foreign corporate bonds		331.0		6.6		4.1		0.2		335.1		6.8
Mortgage and asset-backed securities:
RMBS		652.0		11.4		43.4		1.1		695.4		12.5
CMBS		148.9		1.4		117.7		2.2		266.6		3.6
Other asset-backed securities		334.7		1.6		550.4		10.1		885.1		11.7
Total debt securities		4,872.3		107.4		809.8		17.2		5,682.1		124.6
Total temporarily impaired securities	$	5,491.7	$	146.6	$	809.8	$	17.2	$	6,301.5	$	163.8

As of September 30, 2017, Alleghany held a total of 1,111 debt and equity securities that were in an unrealized loss position, of which 363, all debt 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 municipal bonds and U.S. Government obligations.

As of September 30, 2017, the vast majority of Alleghany’s debt securities were rated investment grade, with 7.3 percent of debt securities having issuer credit ratings that were below investment grade or not rated, compared with 5.1 percent as of December 31, 2016.

(g) 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 September 30, 2017, Alleghany’s carrying value in the Pillar Investments, as determined under the equity method of accounting, was $216.7 million, which is net of returns of capital received from the Pillar Investments.

In July 2013, AIHL invested $250.0 million in Ares Management LLC (“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 to limited partner interests in certain Ares subsidiaries that are convertible into an aggregate 5.9 percent interest in Ares common units. These interests may be converted at any time at Alleghany’s discretion. Until Alleghany determines to convert its limited partner interests into Ares common units, Alleghany classifies its investment in Ares as a component of other invested assets and accounts for its investment using the equity method of accounting. As of September 30, 2017, AIHL’s carrying value in Ares was $213.9 million, which is net of returns of capital received from Ares.

(h) Investments in Commercial Mortgage Loans

As of September 30, 2017, the carrying value of Alleghany’s commercial mortgage loan portfolio was $649.7 million, representing the unpaid principal balance on the loans. As of September 30, 2017, 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

9 Months Ended

Sep. 30, 2017

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.

As discussed in Note 5(d) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2016 Form 10-K, RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program 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, 2017. Both programs were renewed on May 1, 2017 with substantially similar terms as the expired programs.

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Liability for Loss and LAE

9 Months Ended

Sep. 30, 2017

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 nine months ended September 30, 2017 and 2016:

	Nine Months Ended September 30,
	2017		2016
	($ in millions)
Reserves as of January 1	$	11,087.2	$	10,799.2
Less: reinsurance recoverables(1)		1,236.2		1,169.3
Net reserves as of January 1		9,851.0		9,629.9
Other adjustments		(0.7)		3.2
Incurred loss and LAE, net of reinsurance, related to:
Current year		3,099.0		2,460.2
Prior years		(173.0)		(261.7)
Total incurred loss and LAE, net of reinsurance		2,926.0		2,198.5
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		390.6		206.0
Prior years		1,743.2		1,702.7
Total paid loss and LAE, net of reinsurance		2,133.8		1,908.7
Foreign exchange effect		120.5		(22.6)
Net reserves as of September 30		10,763.0		9,900.3
Reinsurance recoverables as of September 30(1)		1,693.4		1,157.8
Reserves as of September 30	$	12,456.4	$	11,058.1

(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 September 30, 2017 increased from December 31, 2016, primarily reflecting significant catastrophe losses. Catastrophe losses, net of reinsurance, in the third quarter and first nine months of 2017 included $264.6 million related to Hurricane Harvey in August 2017, $312.0 million related to Hurricane Irma in September 2017, and $170.3 million related to Hurricane Maria in September 2017.

(b) Liability Development

The following table presents the (favorable) unfavorable prior accident year loss reserve development for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	(7.8)	(1)	$	(1.2)	(2)	$	(12.2)	(1)	$	(9.0)	(2)
Non-catastrophe		(0.3)			(9.6)	(3)		(50.4)	(4)		(70.3)	(3)
Total property		(8.1)			(10.8)			(62.6)			(79.3)
Casualty & other:
Malpractice Treaties(5)		-			(2.0)			(2.0)			(10.8)
Ogden rate impact(6)		-			-			24.4			-
Other		(41.7)	(7)		(56.2)	(8)		(100.6)	(9)		(127.9)	(8)
Total casualty & other		(41.7)			(58.2)			(78.2)			(138.7)
Total Reinsurance Segment		(49.8)			(69.0)			(140.8)			(218.0)
Insurance Segment
RSUI:
Casualty		(6.9)	(10)		(11.9)	(11)		(28.5)	(10)		(32.1)	(11)
Property and other		(1.7)	(12)		(4.6)	(13)		1.2	(14)		(8.4)	(13)
Total RSUI		(8.6)			(16.5)			(27.3)			(40.5)
CapSpecialty:
Asbestos-related illness and environmental impairment  liability		-			-			-			(2.0)
Other		(2.3)	(15)		(0.9)	(16)		(3.1)	(15)		(1.2)	(16)
Total CapSpecialty		(2.3)			(0.9)			(3.1)			(3.2)
PacificComp		(0.8)	(17)		-			(1.8)	(17)		-
Total incurred related to prior years	$	(61.5)		$	(86.4)		$	(173.0)		$	(261.7)

(1) Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2016 accident years.

(2) Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2015 accident years.

(3) Reflects favorable prior accident year loss reserve development primarily related to the 2014 through 2015 accident years.

(4) Reflects favorable prior accident year loss reserve development primarily related to the 2013 through 2016 accident years.

(5) 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.

(6) Represents unfavorable prior accident year loss reserve development arising from the U.K. Ministry of Justice’s decision to significantly reduce 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. As of March 20, 2017, the Ogden rate changed from 2.50 percent to negative 0.75 percent.

(7) Primarily reflects favorable prior accident year loss reserve development in longer-tailed U.S. professional liability lines of business related to older accident years and shorter-tailed casualty lines of business in the U.K. related to recent accident years.

(8) Generally reflects favorable prior accident year loss reserve development in a variety of casualty & other lines of business primarily related to the 2005, 2006 and 2008 through 2015 accident years.

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

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

(11) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess, general liability and professional liability lines of business related to the 2006 through 2012 accident years.

(12) Primarily reflects favorable unallocated LAE development.

(13) Primarily reflects favorable prior accident year loss reserve development in the non-catastrophe property lines of business in recent accident years.

(14) Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business primarily related to the 2015 and 2016 accident years, partially offset by favorable catastrophe prior accident year loss reserve development related to the 2016 accident year.

(15) Primarily reflects favorable prior accident year loss reserve development in the casualty lines of business related to the 2010, 2014, 2015 and 2016 accident years.

(16) Primarily reflects favorable prior accident year loss reserve development in the surety lines of business related to the 2015 accident year.

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

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Income Taxes

9 Months Ended

Sep. 30, 2017

Income Taxes

6. Income Taxes

The effective tax rate on earnings before income taxes for the first nine months of 2017 was 66.8 percent, compared with 29.3 percent for the first nine months of 2016. The 66.8 percent effective tax rate is calculated based on actual results through September 30, 2017 because management was not able to reliably estimate the annual effective tax rate in light of the recent catastrophe losses incurred. The effective tax rate in the first nine months of 2017 compared with the first nine months of 2016 primarily reflects income tax benefits from taxable losses arising from Hurricanes Harvey, Irma and Maria in the first nine months of 2017, and prior period income tax expense adjustments in the first nine months of 2016, which include $16.1 million of out-of-period reductions to current and deferred TransRe tax assets recorded in the first nine months of 2016 that related primarily to periods prior to Alleghany’s merger with TransRe in 2012.

Alleghany believes that, as of September 30, 2017, it had no material uncertain tax positions. Interest and penalties relating 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 September 30, 2017.

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Stockholders' Equity

9 Months Ended

Sep. 30, 2017

Stockholders' Equity

7. Stockholders’ Equity

(a) Common Stock Repurchases

In July 2014, 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 $350.0 million (the “2014 Repurchase Program”). In November 2015, the Alleghany Board of Directors authorized the repurchase, upon the completion of the 2014 Repurchase Program, 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 (the “2015 Repurchase Program”). In the first quarter of 2016, Alleghany completed the 2014 Repurchase Program and subsequent repurchases have been made pursuant to the 2015 Repurchase Program. As of September 30, 2017, Alleghany had $370.7 million remaining under its share repurchase authorization.

The following table presents the shares of Common Stock that Alleghany repurchased in the three and nine months ended September 30, 2017 and 2016 pursuant to the 2014 Repurchase Program and the 2015 Repurchase Program, as applicable:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Shares repurchased		15,916		4,621		15,916		117,721
Cost of shares repurchased (in millions)	$	8.5	$	2.4	$	8.5	$	55.7
Average price per share repurchased	$	537.14	$	517.40	$	537.14	$	472.97

(b) Accumulated Other Comprehensive Income

The following tables present a reconciliation of the changes during the nine months ended September 30, 2017 and 2016 in accumulated other comprehensive income attributable to Alleghany stockholders:

	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
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		364.6		22.4		(0.2)		386.8
Reclassifications from accumulated other comprehensive income		(57.7)		-		-		(57.7)
Total		306.9		22.4		(0.2)		329.1
Balance as of September 30, 2017	$	539.1	$	(88.8)	$	(11.9)	$	438.4

	Unrealized Appreciation of Investments		Unrealized Currency Translation Adjustment		Retirement Plans		Total
	($ in millions)
Balance as of January 1, 2016	$	231.9	$	(104.0)	$	(11.6)	$	116.3
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		238.4		19.2		0.4		258.0
Reclassifications from accumulated other comprehensive income		(42.7)		-		-		(42.7)
Total		195.7		19.2		0.4		215.3
Balance as of September 30, 2016	$	427.6	$	(84.8)	$	(11.2)	$	331.6

The following table presents reclassifications out of accumulated other comprehensive income attributable to Alleghany stockholders during the three and nine months ended September 30, 2017 and 2016:

Accumulated Other Comprehensive Income Component		Three Months Ended September 30,				Nine Months Ended September 30,
	Line in Consolidated Statement of  Earnings	2017		2016		2017		2016
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(32.9)	$	(27.2)	$	(101.8)	$	(103.9)
	Other than temporary impairment losses		6.1		11.7		13.1		38.2
	Income taxes		9.4		5.4		31.0		23.0
Total reclassifications:	Net earnings	$	(17.4)	$	(10.1)	$	(57.7)	$	(42.7)

(1) Net realized capital gains for the nine months ended September 30, 2016 exclude the Jazwares Remeasurement Gain of $13.2 million.

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Earnings Per Share of Common Stock

9 Months Ended

Sep. 30, 2017

Earnings Per Share of Common Stock

8. Earnings Per Share of Common Stock

The following is a reconciliation of the earnings and share data used in the basic and diluted (losses) earnings per share computations for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions, except share amounts)
Net (losses) earnings available to Alleghany stockholders	$	(314.2)	$	155.8	$	(63.2)	$	387.4
Effect of dilutive securities		(8.9)		-		-		-
(Losses) Income available to common stockholders for diluted earnings per share	$	(323.1)	$	155.8	$	(63.2)	$	387.4
Weighted average common shares outstanding applicable to basic earnings  per share		15,416,014		15,438,399		15,416,249		15,443,150
Effect of dilutive securities		42,310		-		-		6,330
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		15,458,324		15,438,399		15,416,249		15,449,480

63,567 and 70,881 contingently issuable shares were potentially available during the first nine months of 2017 and 2016, 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

9 Months Ended

Sep. 30, 2017

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.

(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 2016 Form 10-K.

(c) Energy Holdings

As of September 30, 2017, Alleghany had holdings in energy sector businesses of $519.3 million, comprised of $319.4 million of debt securities, $50.7 million of equity securities and $149.2 million of Alleghany’s equity attributable to SORC.

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Segments of Business

9 Months Ended

Sep. 30, 2017

Segments of Business

10. Segments of Business

(a) Overview

Alleghany’s segments are reported in a manner consistent with the way management evaluates the businesses. As such, Alleghany classifies its business into two reportable segments – reinsurance and insurance. Other activities include Alleghany Capital and corporate activities. In addition, reinsurance and insurance underwriting activities are evaluated separately from investment and other activities. Net realized capital gains and OTTI losses are not considered relevant in evaluating investment performance on an annual basis. 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 2016 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. Over one-third 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 PacificComp. RSUI also writes a modest amount of assumed reinsurance business, which is included in the insurance segment.

The components of other activities are Alleghany Capital and corporate activities. Alleghany Capital consists of manufacturing and service operations, oil and gas operations and corporate operations and investments at the Alleghany Capital level. Manufacturing and service operations are conducted through Bourn & Koch, Kentucky Trailer, IPS, Jazwares, W&W|AFCO Steel, beginning April 28, 2017, and Alleghany Capital’s investment in Wilbert, beginning August 1, 2017. Oil and gas operations are conducted through SORC.

On August 1, 2017, Alleghany Capital acquired a 45 percent equity interest in Wilbert for $72.3 million.

On April 28, 2017, Alleghany Capital acquired approximately 80 percent of the equity in W&W|AFCO Steel for $164.5 million, including $163.9 million in cash paid on May 1, 2017 and $0.6 million of estimated purchase price adjustments. In connection with the acquisition, Alleghany recorded $39.9 million, $25.3 million and $70.0 million of goodwill, indefinite-lived intangible assets and finite-lived intangible assets, respectively. Indefinite-lived intangible assets relate to trade name and finite-lived intangible assets relate to customer relationships. The customer relationship asset is estimated to have a useful life of ten years.

On April 15, 2016, Alleghany Capital acquired an additional 50 percent of Jazwares’ outstanding equity, bringing its equity ownership interest to 80 percent and, as of that date, the results of Jazwares have been included in Alleghany’s consolidated results. Prior to April 15, 2016, Jazwares was accounted for under the equity method of accounting.

The primary components of corporate activities are Alleghany Properties and other 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 2016 Form 10-K.

(b) Results

The following tables present the results for Alleghany’s two reportable segments and for other activities for the three and nine months ended September 30, 2017 and 2016:

	Reinsurance Segment						Insurance Segment										Other Activities
Three Months ended September 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	445.5	$	681.1	$	1,126.6	$	234.6	$	74.3	$	41.6	$	350.5	$	1,477.1	$	-	$	(5.3)	$	1,471.8
Net premiums written		329.0		649.5		978.5		170.8		69.5		41.5		281.8		1,260.3		-		-		1,260.3
Net premiums earned		310.8		642.4		953.2		179.0		66.1		41.4		286.5		1,239.7		-		-		1,239.7
Net loss and LAE		659.9		459.3		1,119.2		305.4		37.0		30.3		372.7		1,491.9		-		-		1,491.9
Commissions, brokerage and other underwriting expenses		105.2		203.7		308.9		50.3		28.4		10.6		89.3		398.2		-		-		398.2
Underwriting (loss) profit (3)	$	(454.3)	$	(20.6)	$	(474.9)	$	(176.7)	$	0.7	$	0.5	$	(175.5)		(650.4)		-		-		(650.4)
Net investment income																101.4		1.6		1.7		104.7
Net realized capital gains																21.5		0.7		10.7		32.9
Other than temporary impairment losses																(6.1)		-		-		(6.1)
Other revenue																4.7		291.7		(0.1)		296.3
Other operating expenses																8.3		269.1		0.5		277.9
Corporate administration																(1.5)		-		(3.2)		(4.7)
Amortization of intangible assets																(0.3)		6.0		-		5.7
Interest expense																6.6		1.2		13.0		20.8
(Losses) earnings before income taxes															$	(542.0)	$	17.7	$	2.0	$	(522.3)
	Reinsurance Segment						Insurance Segment										Other Activities
Three Months ended September 30, 2016	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	400.2	$	665.2	$	1,065.4	$	243.7	$	68.5	$	37.8	$	350.0	$	1,415.4	$	-	$	(7.5)	$	1,407.9
Net premiums written		320.5		646.4		966.9		168.3		64.4		37.1		269.8		1,236.7		-		-		1,236.7
Net premiums earned		314.6		654.8		969.4		186.8		61.6		35.7		284.1		1,253.5		-		-		1,253.5
Net loss and LAE		157.6		404.6		562.2		94.8		34.5		27.1		156.4		718.6		-		-		718.6
Commissions, brokerage and other underwriting expenses		105.4		227.7		333.1		53.9		26.4		9.6		89.9		423.0		-		-		423.0
Underwriting profit (loss) (3)	$	51.6	$	22.5	$	74.1	$	38.1	$	0.7	$	(1.0)	$	37.8		111.9		-		-		111.9
Net investment income																118.7		-		1.9		120.6
Net realized capital gains																27.1		0.1		-		27.2
Other than temporary impairment losses																(11.7)		-		-		(11.7)
Other revenue																0.3		218.6		6.1		225.0
Other operating expenses																23.6		203.6		1.2		228.4
Corporate administration																0.3		-		10.4		10.7
Amortization of intangible assets																(0.7)		6.7		-		6.0
Interest expense																6.8		0.6		13.3		20.7
Earnings (losses) before income taxes															$	216.3	$	7.8	$	(16.9)	$	207.2
	Reinsurance Segment						Insurance Segment										Other Activities
Nine Months ended September 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	1,190.0	$	2,037.7	$	3,227.7	$	794.1	$	213.2	$	124.2	$	1,131.5	$	4,359.2	$	-	$	(16.5)	$	4,342.7
Net premiums written		931.4		1,975.3		2,906.7		558.0		198.9		122.9		879.8		3,786.5		-		-		3,786.5
Net premiums earned		868.1		1,968.7		2,836.8		540.3		192.2		123.5		856.0		3,692.8		-		-		3,692.8
Net loss and LAE		904.6		1,344.7		2,249.3		479.7		105.7		91.3		676.7		2,926.0		-		-		2,926.0
Commissions, brokerage and other underwriting expenses		283.7		662.9		946.6		158.3		83.3		32.2		273.8		1,220.4		-		-		1,220.4
Underwriting (loss) profit (3)	$	(320.2)	$	(38.9)	$	(359.1)	$	(97.7)	$	3.2	$	-	$	(94.5)		(453.6)		-		-		(453.6)
Net investment income																311.7		2.1		8.1		321.9
Net realized capital gains																90.8		0.9		10.1		101.8
Other than temporary impairment losses																(13.1)		-		-		(13.1)
Other revenue																10.5		634.3		5.6		650.4
Other operating expenses																57.4		618.2		2.6		678.2
Corporate administration																0.2		-		26.4		26.6
Amortization of intangible assets																(1.2)		15.4		-		14.2
Interest expense																20.2		3.0		39.5		62.7
(Losses) earnings before income taxes															$	(130.3)	$	0.7	$	(44.7)	$	(174.3)
	Reinsurance Segment						Insurance Segment										Other Activities
Nine Months ended September 30, 2016	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	1,173.3	$	2,136.7	$	3,310.0	$	808.3	$	201.5	$	105.9	$	1,115.7	$	4,425.7	$	-	$	(19.0)	$	4,406.7
Net premiums written		945.1		2,088.3		3,033.4		566.3		189.0		104.5		859.8		3,893.2		-		-		3,893.2
Net premiums earned		857.9		2,030.6		2,888.5		567.4		175.8		104.9		848.1		3,736.6		-		-		3,736.6
Net loss and LAE		454.9		1,282.7		1,737.6		289.0		92.4		79.5		460.9		2,198.5		-		-		2,198.5
Commissions, brokerage and other underwriting expenses		275.6		693.6		969.2		161.9		78.7		28.9		269.5		1,238.7		-		-		1,238.7
Underwriting profit (loss) (3)	$	127.4	$	54.3	$	181.7	$	116.5	$	4.7	$	(3.5)	$	117.7		299.4		-		-		299.4
Net investment income																326.4		-		5.9		332.3
Net realized capital gains																107.6		13.0		(3.5)		117.1
Other than temporary impairment losses																(38.2)		-		-		(38.2)
Other revenue																3.8		517.3		6.7		527.8
Other operating expenses																65.1		508.0		2.4		575.5
Corporate administration																1.0		-		33.0		34.0
Amortization of intangible assets																(2.4)		16.9		-		14.5
Interest expense																20.6		1.2		39.6		61.4
Earnings (losses) before income taxes															$	614.7	$	4.2	$	(65.9)	$	553.0

(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, net realized capital gains, OTTI losses, other 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 segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes 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

As of September 30, 2017, the identifiable assets of the reinsurance segment, insurance segment and other activities were $16.9 billion, $7.0 billion and $1.8 billion, respectively, of which cash and invested assets represented $13.6 billion, $5.4 billion and $0.7 billion, respectively. As of September 30, 2017, Alleghany’s equity attributable to the reinsurance segment, insurance segment and other activities was $5.1 billion, $2.8 billion and $0.3 billion, respectively.

Included in other activities is debt associated with Alleghany Capital’s operating subsidiaries, which totaled $102.5 million as of September 30, 2017. The $102.5 million includes $31.2 million of borrowings by Jazwares under its available credit facility, $23.0 million of borrowings by W&W|AFCO Steel under its available credit facility and term loans, $17.0 million of debt at Kentucky Trailer related primarily to a mortgage loan, borrowings to finance small acquisitions and borrowings under its available credit facility, $15.9 million of borrowings by IPS under its available credit facility and $15.4 million of term loans at Bourn & Koch related to borrowings to finance an acquisition. None of these liabilities are guaranteed by Alleghany or Alleghany Capital.

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Credit Agreement

9 Months Ended

Sep. 30, 2017

Credit Agreement

11. Credit Agreement

On July 31, 2017, Alleghany entered into a five-year credit agreement (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 Alleghany’s 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 July 31, 2017 through September 30, 2017.

The Credit Agreement replaced Alleghany’s previous four-year credit agreement (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.

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Summary of Significant Accounting Principles (Policies)

9 Months Ended

Sep. 30, 2017

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, 2016 (the “2016 Form 10-K”) and the Quarterly Reports on Form 10-Q for the quarters ended March 31, 2017 and June 30, 2017 of Alleghany Corporation (“Alleghany”).

Alleghany, 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 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”), CapSpecialty, Inc. (“CapSpecialty”) and Pacific Compensation Corporation (“PacificComp”). CapSpecialty has been a subsidiary of AIHL since January 2002, RSUI has been a subsidiary of AIHL since July 2003 and PacificComp has been a subsidiary of AIHL since July 2007. AIHL Re LLC (“AIHL Re”), a captive reinsurance company which provides reinsurance to Alleghany’s insurance operating subsidiaries and affiliates, has been a wholly-owned subsidiary of Alleghany since its formation in May 2006. Alleghany’s reinsurance operations commenced on March 6, 2012 when Alleghany consummated a merger with Transatlantic Holdings, Inc. (“TransRe”) and TransRe became one of Alleghany’s wholly-owned subsidiaries.

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 capital investments primarily through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s investments are included in other activities for segment reporting purposes and include:

• Stranded Oil Resources Corporation (“SORC”), an exploration and production company focused on enhanced oil recovery, headquartered in Golden, Colorado;

• 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 engineering-focused 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, acquired on April 28, 2017; 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, acquired on August 1, 2017. Wilbert is accounted for under the equity method of accounting and is included in other invested assets.

On April 15, 2016, Alleghany Capital acquired an additional 50 percent of Jazwares’ outstanding equity, bringing its equity ownership interest to 80 percent and, as of that date, the results of Jazwares have been included in Alleghany’s consolidated results. Prior to April 15, 2016, Jazwares was accounted for under the equity method of accounting.

In addition, Alleghany owns and manages properties in the Sacramento, California region through its wholly-owned subsidiary Alleghany Properties Holdings LLC (“Alleghany Properties”). Alleghany’s public equity investments are managed primarily through Alleghany’s wholly-owned subsidiary Roundwood Asset Management LLC.

On September 12, 2017, AIHL signed a definitive agreement to sell PacificComp to CopperPoint Mutual Insurance Company (“CopperPoint”) for total cash consideration of approximately $150 million. 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. The transaction, which is subject to customary regulatory review and approvals, is expected to close on December 31, 2017. Upon closing, Alleghany expects to record an estimated after-tax gain of approximately $25 million, which amount includes a tax benefit. As of September 30, 2017, PacificComp’s total assets were $440.6 million, consisting primarily of debt securities, and PacificComp’s total liabilities were $313.7 million, consisting primarily of loss and loss adjustment expenses (“LAE”) reserves.

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 accumulated other 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 nine months of 2017, Bourn & Koch had approximately 11 percent noncontrolling interests outstanding, Kentucky Trailer had approximately 21 percent noncontrolling interests outstanding, IPS had approximately 16 percent noncontrolling interests outstanding and Jazwares had approximately 20 percent noncontrolling interests outstanding. W&W|AFCO Steel had approximately 20 percent noncontrolling interests outstanding from its April 28, 2017 acquisition date through September 30, 2017.

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 2016 Form 10-K.

Recent Accounting Standards

(c) Recent Accounting Standards

Recently Adopted

In May 2015, the Financial Accounting Standards Board (the “FASB”) issued guidance that requires disclosures related to short-duration insurance contracts. The guidance applies to property and casualty insurance and reinsurance entities, among others, and requires the following annual disclosure related to the liability for loss and LAE: (i) net incurred and paid claims development information by accident year for up to ten years; (ii) a reconciliation of incurred and paid claims development information to the aggregate carrying amount of the liability for loss and LAE; (iii) liabilities for losses that have been incurred but not yet reported by accident year and in total; (iv) a description of reserving methodologies (as well as any changes to those methodologies); (v) quantitative information about claim frequency by accident year; and (vi) the average annual percentage payout of incurred claims by age and accident year. In addition, the guidance also requires insurance entities to disclose for annual and interim reporting periods a roll-forward of the liability for loss and LAE. This guidance was effective for annual periods beginning after December 15, 2015 and interim periods within annual periods beginning after December 15, 2016, with early adoption permitted. Alleghany adopted this guidance as of December 31, 2016 and the implementation did not have an impact on its results of operations and financial condition. See Note 5 of this Form 10-Q and Note 1(k) and Note 6 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2016 Form 10-K for the new disclosures.

Future Application of Accounting Standards

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 are not impacted by this guidance. This guidance is effective in the first quarter of 2018 for public entities, with early adoption permitted in 2017. Alleghany will adopt this guidance in the first quarter of 2018 and does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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) to be measured at fair value with changes in fair value recognized in net income. 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 will adopt this guidance in the first quarter of 2018. As of January 1, 2018, unrealized gains or losses of equity securities, net of deferred taxes, will be reclassified from accumulated other comprehensive income to retained earnings. Subsequently, all changes in unrealized gains or losses of equity securities, net of deferred taxes, will be presented in the Consolidated Statements of Earnings rather than the Consolidated Statements of Comprehensive Income. Alleghany does not currently believe that the implementation will have a material impact on its financial condition. See Note 3(a) of this Form 10-Q for further information on Alleghany’s unrealized gains and losses of equity securities.

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 2016 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.

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 will adopt this guidance in the fourth quarter of 2017, and will record a cumulative effect reduction directly to opening 2017 retained earnings and an offsetting increase in opening 2017 accumulated other comprehensive income at that time. Alleghany does not currently believe that the implementation will have a material impact on its results of operations and financial condition.

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 better aligns hedge accounting with 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)

9 Months Ended

Sep. 30, 2017

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 September 30, 2017 and December 31, 2016:

	September 30, 2017				December 31, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	17,590.2	$	17,590.2	$	16,899.2	$	16,899.2
Liabilities
Senior Notes and other debt(2)	$	1,486.4	$	1,655.5	$	1,476.5	$	1,584.3

(1) This table includes AFS investments (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 2016 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 September 30, 2017 and December 31, 2016:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of September 30, 2017
Equity securities:
Common stock	$	3,815.2	$	0.5	$	0.9	$	3,816.6
Preferred stock		-		-		5.0		5.0
Total equity securities		3,815.2		0.5		5.9		3,821.6
Debt securities:
U.S. Government obligations		-		1,020.7		-		1,020.7
Municipal bonds		-		4,131.7		-		4,131.7
Foreign government obligations		-		1,136.2		4.7		1,140.9
U.S. corporate bonds		-		2,202.2		278.8		2,481.0
Foreign corporate bonds		-		1,254.3		39.9		1,294.2
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		-		948.8		5.4		954.2
Commercial mortgage-backed securities (“CMBS”)		-		505.5		11.4		516.9
Other asset-backed securities(2)		-		490.3		1,182.5		1,672.8
Total debt securities		-		11,689.7		1,522.7		13,212.4
Short-term investments		-		547.8		-		547.8
Other invested assets(3)		-		-		8.4		8.4
Total investments (excluding equity method investments and loans)	$	3,815.2	$	12,238.0	$	1,537.0	$	17,590.2
Senior Notes and other debt	$	-	$	1,553.0	$	102.5	$	1,655.5
	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2016
Equity securities:
Common stock	$	3,105.2	$	-	$	4.3	$	3,109.5
Preferred stock		-		-		-		-
Total equity securities		3,105.2		-		4.3		3,109.5
Debt securities:
U.S. Government obligations		-		1,243.3		-		1,243.3
Municipal bonds		-		4,185.8		-		4,185.8
Foreign government obligations		-		1,047.1		-		1,047.1
U.S. corporate bonds		-		2,120.2		72.9		2,193.1
Foreign corporate bonds		-		1,088.4		0.4		1,088.8
Mortgage and asset-backed securities:
RMBS(1)		-		994.5		5.9		1,000.4
CMBS		-		730.5		4.3		734.8
Other asset-backed securities(2)		-		586.1		903.8		1,489.9
Total debt securities		-		11,995.9		987.3		12,983.2
Short-term investments		-		778.4		-		778.4
Other invested assets(3)		-		-		28.1		28.1
Total investments (excluding equity method investments and  loans)	$	3,105.2	$	12,774.3	$	1,019.7	$	16,899.2
Senior Notes and other debt	$	-	$	1,491.5	$	92.8	$	1,584.3

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

(2) Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

(3) Includes partnership and non-marketable equity investments accounted for on an AFS basis, 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 nine months ended September 30, 2017 and 2016 in Level 3 assets measured at fair value:

	Equity Securities				Debt Securities
											Mortgage and asset-backed
Nine Months Ended September 30, 2017	Common   Stock		Preferred   Stock		Foreign  Government  Obligations		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)		0.2		(0.2)		-		(0.2)		-		0.2		-		3.9		10.8		14.7
Other comprehensive income		-		0.2		-		3.2		0.8		0.3		0.1		15.0		(8.9)		10.7
Purchases		-		5.6		4.7		220.4		38.6		-		9.6		746.7		-		1,025.6
Sales		(2.6)		(0.6)		-		(10.2)		(0.2)		-		(2.2)		(59.5)		(21.6)		(96.9)
Issuances		-		-		-		-		-		-		-		-		-		-
Settlements		-		-		-		(6.3)		-		(1.0)		(0.4)		(427.4)		-		(435.1)
Transfers into Level 3		1.4		-		-		3.8		0.3		-		-		-		-		5.5
Transfers out of Level 3		(2.4)		-		-		(4.8)		-		-		-		-		-		(7.2)
Balance as of September 30, 2017	$	0.9	$	5.0	$	4.7	$	278.8	$	39.9	$	5.4	$	11.4	$	1,182.5	$	8.4	$	1,537.0

			Debt Securities
							Mortgage and asset-backed
Nine Months Ended September 30, 2016	Common     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, 2016	$	-	$	49.8	$	-	$	14.9	$	20.2	$	953.0	$	29.9	$	1,067.8
Net realized/unrealized gains (losses) included in:
Net earnings(2)		(0.1)		(0.5)		-		0.3		(0.1)		2.2		4.2		6.0
Other comprehensive income		1.8		1.4		-		(0.7)		0.8		25.1		(2.9)		25.5
Purchases		2.2		39.4		-		-		-		32.1		-		73.7
Sales		-		(14.5)		-		(7.0)		(8.2)		(70.7)		(4.2)		(104.6)
Issuances		-		-		-		-		-		-		-		-
Settlements		-		(1.7)		-		(1.5)		(0.5)		(33.6)		-		(37.3)
Transfers into Level 3		1.0		5.5		1.9		-		-		-		-		8.4
Transfers out of Level 3		-		(5.1)		-		-		-		-		(0.3)		(5.4)
Balance as of September 30, 2016	$	4.9	$	74.3	$	1.9	$	6.0	$	12.2	$	908.1	$	26.7	$	1,034.1

(1) Includes partnership and non-marketable equity investments accounted for on an AFS basis.

(2) There were no other than temporary impairment (“OTTI”) losses recorded in net earnings related to Level 3 assets still held as of September 30, 2017 and 2016.

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Investments (Tables)

9 Months Ended

Sep. 30, 2017

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 September 30, 2017 and December 31, 2016:

	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	($ in millions)
As of September 30, 2017
Equity securities:
Common stock	$	3,170.0	$	662.8	$	(16.2)	$	3,816.6
Preferred stock		4.8		0.2		-		5.0
Total equity securities		3,174.8		663.0		(16.2)		3,821.6
Debt securities:
U.S. Government obligations		1,033.1		1.6		(14.0)		1,020.7
Municipal bonds		4,039.6		106.9		(14.8)		4,131.7
Foreign government obligations		1,134.6		14.0		(7.7)		1,140.9
U.S. corporate bonds		2,425.6		63.6		(8.2)		2,481.0
Foreign corporate bonds		1,270.5		27.1		(3.4)		1,294.2
Mortgage and asset-backed securities:
RMBS		953.9		7.7		(7.4)		954.2
CMBS		509.2		10.0		(2.3)		516.9
Other asset-backed securities(1)		1,661.1		13.4		(1.7)		1,672.8
Total debt securities		13,027.6		244.3		(59.5)		13,212.4
Short-term investments		547.8		-		-		547.8
Total investments	$	16,750.2	$	907.3	$	(75.7)	$	17,581.8
	Amortized Cost or Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	($ in millions)
As of December 31, 2016
Equity securities:
Common stock	$	2,816.6	$	332.1	$	(39.2)	$	3,109.5
Preferred stock		-		-		-		-
Total equity securities		2,816.6		332.1		(39.2)		3,109.5
Debt securities:
U.S. Government obligations		1,265.7		2.2		(24.6)		1,243.3
Municipal bonds		4,161.0		66.9		(42.1)		4,185.8
Foreign government obligations		1,030.9		20.2		(4.0)		1,047.1
U.S. corporate bonds		2,168.9		43.5		(19.3)		2,193.1
Foreign corporate bonds		1,068.3		27.3		(6.8)		1,088.8
Mortgage and asset-backed securities:
RMBS		1,005.9		7.0		(12.5)		1,000.4
CMBS		728.8		9.6		(3.6)		734.8
Other asset-backed securities(1)		1,497.6		4.0		(11.7)		1,489.9
Total debt securities		12,927.1		180.7		(124.6)		12,983.2
Short-term investments		778.4		-		-		778.4
Total investments	$	16,522.1	$	512.8	$	(163.8)	$	16,871.1

(1) Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

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

The amortized cost or cost and estimated fair value of debt securities by contractual maturity as of September 30, 2017 are presented below. 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 September 30, 2017
Short-term investments due in one year or less	$	547.8	$	547.8
Mortgage and asset-backed securities(1)		3,124.2		3,143.9
Debt securities with maturity dates:
One year or less		385.2		386.1
Over one through five years		3,089.6		3,124.6
Over five through ten years		3,359.4		3,414.9
Over ten years		3,069.2		3,142.9
Total debt securities		13,027.6		13,212.4
Equity securities		3,174.8		3,821.6
Total	$	16,750.2	$	17,581.8

(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 nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions)
Interest income	$	104.6	$	99.0	$	306.3	$	299.0
Dividend income		6.7		12.2		27.9		35.5
Investment expenses		(5.8)		(6.2)		(20.1)		(19.8)
Equity in results of Pillar Investments(1)		(9.4)		5.9		(2.9)		12.9
Equity in results of Ares(1)		6.9		4.6		(0.4)		5.1
Other investment results		1.7		5.1		11.1		(0.4)
Total	$	104.7	$	120.6	$	321.9	$	332.3

(1) See Note 3(g) of this Form 10-Q for discussion of the Pillar Investments and the investment in Ares, each as defined therein.

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 nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions)
Gross realized capital gains	$	47.0	$	32.7	$	189.7	$	217.7
Gross realized capital losses		(14.1)		(5.5)		(87.9)		(100.6)
Net realized capital gains	$	32.9	$	27.2	$	101.8	$	117.1

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

The following tables present gross unrealized losses and related fair values for equity securities and debt securities, grouped by duration of time in a continuous unrealized loss position, as of September 30, 2017 and December 31, 2016:

	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 September 30, 2017
Equity securities:
Common stock	$	998.5	$	16.2	$	-	$	-	$	998.5	$	16.2
Preferred stock		-		-		-		-		-		-
Total equity securities		998.5		16.2		-		-		998.5		16.2
Debt securities:
U.S. Government obligations		626.0		5.9		242.9		8.1		868.9		14.0
Municipal bonds		404.5		2.5		358.4		12.3		762.9		14.8
Foreign government obligations		408.2		4.9		76.0		2.8		484.2		7.7
U.S. corporate bonds		399.3		5.0		206.3		3.2		605.6		8.2
Foreign corporate bonds		236.6		1.6		117.3		1.8		353.9		3.4
Mortgage and asset-backed securities:
RMBS		429.7		4.7		132.8		2.7		562.5		7.4
CMBS		24.8		0.2		41.8		2.1		66.6		2.3
Other asset-backed securities		232.5		0.7		90.8		1.0		323.3		1.7
Total debt securities		2,761.6		25.5		1,266.3		34.0		4,027.9		59.5
Total temporarily impaired securities	$	3,760.1	$	41.7	$	1,266.3	$	34.0	$	5,026.4	$	75.7
	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, 2016
Equity securities:
Common stock	$	619.4	$	39.2	$	-	$	-	$	619.4	$	39.2
Preferred stock		-		-		-		-		-		-
Total equity securities		619.4		39.2		-		-		619.4		39.2
Debt securities:
U.S. Government obligations		975.0		24.6		-		-		975.0		24.6
Municipal bonds		1,464.5		39.7		41.6		2.4		1,506.1		42.1
Foreign government obligations		238.3		4.0		-		-		238.3		4.0
U.S. corporate bonds		727.9		18.1		52.6		1.2		780.5		19.3
Foreign corporate bonds		331.0		6.6		4.1		0.2		335.1		6.8
Mortgage and asset-backed securities:
RMBS		652.0		11.4		43.4		1.1		695.4		12.5
CMBS		148.9		1.4		117.7		2.2		266.6		3.6
Other asset-backed securities		334.7		1.6		550.4		10.1		885.1		11.7
Total debt securities		4,872.3		107.4		809.8		17.2		5,682.1		124.6
Total temporarily impaired securities	$	5,491.7	$	146.6	$	809.8	$	17.2	$	6,301.5	$	163.8

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Liability for Loss and LAE (Tables)

9 Months Ended

Sep. 30, 2017

Activity in Liability for Loss and Loss Adjustment Expense

The following table presents the activity in the liability for loss and LAE in the nine months ended September 30, 2017 and 2016:

	Nine Months Ended September 30,
	2017		2016
	($ in millions)
Reserves as of January 1	$	11,087.2	$	10,799.2
Less: reinsurance recoverables(1)		1,236.2		1,169.3
Net reserves as of January 1		9,851.0		9,629.9
Other adjustments		(0.7)		3.2
Incurred loss and LAE, net of reinsurance, related to:
Current year		3,099.0		2,460.2
Prior years		(173.0)		(261.7)
Total incurred loss and LAE, net of reinsurance		2,926.0		2,198.5
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		390.6		206.0
Prior years		1,743.2		1,702.7
Total paid loss and LAE, net of reinsurance		2,133.8		1,908.7
Foreign exchange effect		120.5		(22.6)
Net reserves as of September 30		10,763.0		9,900.3
Reinsurance recoverables as of September 30(1)		1,693.4		1,157.8
Reserves as of September 30	$	12,456.4	$	11,058.1

(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 nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	(7.8)	(1)	$	(1.2)	(2)	$	(12.2)	(1)	$	(9.0)	(2)
Non-catastrophe		(0.3)			(9.6)	(3)		(50.4)	(4)		(70.3)	(3)
Total property		(8.1)			(10.8)			(62.6)			(79.3)
Casualty & other:
Malpractice Treaties(5)		-			(2.0)			(2.0)			(10.8)
Ogden rate impact(6)		-			-			24.4			-
Other		(41.7)	(7)		(56.2)	(8)		(100.6)	(9)		(127.9)	(8)
Total casualty & other		(41.7)			(58.2)			(78.2)			(138.7)
Total Reinsurance Segment		(49.8)			(69.0)			(140.8)			(218.0)
Insurance Segment
RSUI:
Casualty		(6.9)	(10)		(11.9)	(11)		(28.5)	(10)		(32.1)	(11)
Property and other		(1.7)	(12)		(4.6)	(13)		1.2	(14)		(8.4)	(13)
Total RSUI		(8.6)			(16.5)			(27.3)			(40.5)
CapSpecialty:
Asbestos-related illness and environmental impairment  liability		-			-			-			(2.0)
Other		(2.3)	(15)		(0.9)	(16)		(3.1)	(15)		(1.2)	(16)
Total CapSpecialty		(2.3)			(0.9)			(3.1)			(3.2)
PacificComp		(0.8)	(17)		-			(1.8)	(17)		-
Total incurred related to prior years	$	(61.5)		$	(86.4)		$	(173.0)		$	(261.7)

(1) Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2016 accident years.

(2) Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2015 accident years.

(3) Reflects favorable prior accident year loss reserve development primarily related to the 2014 through 2015 accident years.

(4) Reflects favorable prior accident year loss reserve development primarily related to the 2013 through 2016 accident years.

(5) 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.

(6) Represents unfavorable prior accident year loss reserve development arising from the U.K. Ministry of Justice’s decision to significantly reduce 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. As of March 20, 2017, the Ogden rate changed from 2.50 percent to negative 0.75 percent.

(7) Primarily reflects favorable prior accident year loss reserve development in longer-tailed U.S. professional liability lines of business related to older accident years and shorter-tailed casualty lines of business in the U.K. related to recent accident years.

(8) Generally reflects favorable prior accident year loss reserve development in a variety of casualty & other lines of business primarily related to the 2005, 2006 and 2008 through 2015 accident years.

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

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

(11) Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess, general liability and professional liability lines of business related to the 2006 through 2012 accident years.

(12) Primarily reflects favorable unallocated LAE development.

(13) Primarily reflects favorable prior accident year loss reserve development in the non-catastrophe property lines of business in recent accident years.

(14) Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business primarily related to the 2015 and 2016 accident years, partially offset by favorable catastrophe prior accident year loss reserve development related to the 2016 accident year.

(15) Primarily reflects favorable prior accident year loss reserve development in the casualty lines of business related to the 2010, 2014, 2015 and 2016 accident years.

(16) Primarily reflects favorable prior accident year loss reserve development in the surety lines of business related to the 2015 accident year.

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

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Schedule of Common Stock Repurchases

The following table presents the shares of Common Stock that Alleghany repurchased in the three and nine months ended September 30, 2017 and 2016 pursuant to the 2014 Repurchase Program and the 2015 Repurchase Program, as applicable:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Shares repurchased		15,916		4,621		15,916		117,721
Cost of shares repurchased (in millions)	$	8.5	$	2.4	$	8.5	$	55.7
Average price per share repurchased	$	537.14	$	517.40	$	537.14	$	472.97

Reconciliation of Accumulated Other Comprehensive Income

The following tables present a reconciliation of the changes during the nine months ended September 30, 2017 and 2016 in accumulated other comprehensive income attributable to Alleghany stockholders:

	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
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		364.6		22.4		(0.2)		386.8
Reclassifications from accumulated other comprehensive income		(57.7)		-		-		(57.7)
Total		306.9		22.4		(0.2)		329.1
Balance as of September 30, 2017	$	539.1	$	(88.8)	$	(11.9)	$	438.4

	Unrealized Appreciation of Investments		Unrealized Currency Translation Adjustment		Retirement Plans		Total
	($ in millions)
Balance as of January 1, 2016	$	231.9	$	(104.0)	$	(11.6)	$	116.3
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		238.4		19.2		0.4		258.0
Reclassifications from accumulated other comprehensive income		(42.7)		-		-		(42.7)
Total		195.7		19.2		0.4		215.3
Balance as of September 30, 2016	$	427.6	$	(84.8)	$	(11.2)	$	331.6

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 nine months ended September 30, 2017 and 2016:

Accumulated Other Comprehensive Income Component		Three Months Ended September 30,				Nine Months Ended September 30,
	Line in Consolidated Statement of  Earnings	2017		2016		2017		2016
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(32.9)	$	(27.2)	$	(101.8)	$	(103.9)
	Other than temporary impairment losses		6.1		11.7		13.1		38.2
	Income taxes		9.4		5.4		31.0		23.0
Total reclassifications:	Net earnings	$	(17.4)	$	(10.1)	$	(57.7)	$	(42.7)

(1) Net realized capital gains for the nine months ended September 30, 2016 exclude the Jazwares Remeasurement Gain of $13.2 million.

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Earnings Per Share of Common Stock (Tables)

9 Months Ended

Sep. 30, 2017

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

The following is a reconciliation of the earnings and share data used in the basic and diluted (losses) earnings per share computations for the three and nine months ended September 30, 2017 and 2016:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	($ in millions, except share amounts)
Net (losses) earnings available to Alleghany stockholders	$	(314.2)	$	155.8	$	(63.2)	$	387.4
Effect of dilutive securities		(8.9)		-		-		-
(Losses) Income available to common stockholders for diluted earnings per share	$	(323.1)	$	155.8	$	(63.2)	$	387.4
Weighted average common shares outstanding applicable to basic earnings  per share		15,416,014		15,438,399		15,416,249		15,443,150
Effect of dilutive securities		42,310		-		-		6,330
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		15,458,324		15,438,399		15,416,249		15,449,480

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Segments of Business (Tables)

9 Months Ended

Sep. 30, 2017

Results for Reportable Segments and Other Activities

The following tables present the results for Alleghany’s two reportable segments and for other activities for the three and nine months ended September 30, 2017 and 2016:

	Reinsurance Segment						Insurance Segment										Other Activities
Three Months ended September 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	445.5	$	681.1	$	1,126.6	$	234.6	$	74.3	$	41.6	$	350.5	$	1,477.1	$	-	$	(5.3)	$	1,471.8
Net premiums written		329.0		649.5		978.5		170.8		69.5		41.5		281.8		1,260.3		-		-		1,260.3
Net premiums earned		310.8		642.4		953.2		179.0		66.1		41.4		286.5		1,239.7		-		-		1,239.7
Net loss and LAE		659.9		459.3		1,119.2		305.4		37.0		30.3		372.7		1,491.9		-		-		1,491.9
Commissions, brokerage and other underwriting expenses		105.2		203.7		308.9		50.3		28.4		10.6		89.3		398.2		-		-		398.2
Underwriting (loss) profit (3)	$	(454.3)	$	(20.6)	$	(474.9)	$	(176.7)	$	0.7	$	0.5	$	(175.5)		(650.4)		-		-		(650.4)
Net investment income																101.4		1.6		1.7		104.7
Net realized capital gains																21.5		0.7		10.7		32.9
Other than temporary impairment losses																(6.1)		-		-		(6.1)
Other revenue																4.7		291.7		(0.1)		296.3
Other operating expenses																8.3		269.1		0.5		277.9
Corporate administration																(1.5)		-		(3.2)		(4.7)
Amortization of intangible assets																(0.3)		6.0		-		5.7
Interest expense																6.6		1.2		13.0		20.8
(Losses) earnings before income taxes															$	(542.0)	$	17.7	$	2.0	$	(522.3)
	Reinsurance Segment						Insurance Segment										Other Activities
Three Months ended September 30, 2016	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	400.2	$	665.2	$	1,065.4	$	243.7	$	68.5	$	37.8	$	350.0	$	1,415.4	$	-	$	(7.5)	$	1,407.9
Net premiums written		320.5		646.4		966.9		168.3		64.4		37.1		269.8		1,236.7		-		-		1,236.7
Net premiums earned		314.6		654.8		969.4		186.8		61.6		35.7		284.1		1,253.5		-		-		1,253.5
Net loss and LAE		157.6		404.6		562.2		94.8		34.5		27.1		156.4		718.6		-		-		718.6
Commissions, brokerage and other underwriting expenses		105.4		227.7		333.1		53.9		26.4		9.6		89.9		423.0		-		-		423.0
Underwriting profit (loss) (3)	$	51.6	$	22.5	$	74.1	$	38.1	$	0.7	$	(1.0)	$	37.8		111.9		-		-		111.9
Net investment income																118.7		-		1.9		120.6
Net realized capital gains																27.1		0.1		-		27.2
Other than temporary impairment losses																(11.7)		-		-		(11.7)
Other revenue																0.3		218.6		6.1		225.0
Other operating expenses																23.6		203.6		1.2		228.4
Corporate administration																0.3		-		10.4		10.7
Amortization of intangible assets																(0.7)		6.7		-		6.0
Interest expense																6.8		0.6		13.3		20.7
Earnings (losses) before income taxes															$	216.3	$	7.8	$	(16.9)	$	207.2
	Reinsurance Segment						Insurance Segment										Other Activities
Nine Months ended September 30, 2017	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	1,190.0	$	2,037.7	$	3,227.7	$	794.1	$	213.2	$	124.2	$	1,131.5	$	4,359.2	$	-	$	(16.5)	$	4,342.7
Net premiums written		931.4		1,975.3		2,906.7		558.0		198.9		122.9		879.8		3,786.5		-		-		3,786.5
Net premiums earned		868.1		1,968.7		2,836.8		540.3		192.2		123.5		856.0		3,692.8		-		-		3,692.8
Net loss and LAE		904.6		1,344.7		2,249.3		479.7		105.7		91.3		676.7		2,926.0		-		-		2,926.0
Commissions, brokerage and other underwriting expenses		283.7		662.9		946.6		158.3		83.3		32.2		273.8		1,220.4		-		-		1,220.4
Underwriting (loss) profit (3)	$	(320.2)	$	(38.9)	$	(359.1)	$	(97.7)	$	3.2	$	-	$	(94.5)		(453.6)		-		-		(453.6)
Net investment income																311.7		2.1		8.1		321.9
Net realized capital gains																90.8		0.9		10.1		101.8
Other than temporary impairment losses																(13.1)		-		-		(13.1)
Other revenue																10.5		634.3		5.6		650.4
Other operating expenses																57.4		618.2		2.6		678.2
Corporate administration																0.2		-		26.4		26.6
Amortization of intangible assets																(1.2)		15.4		-		14.2
Interest expense																20.2		3.0		39.5		62.7
(Losses) earnings before income taxes															$	(130.3)	$	0.7	$	(44.7)	$	(174.3)
	Reinsurance Segment						Insurance Segment										Other Activities
Nine Months ended September 30, 2016	Property		Casualty & Other(1)		Total		RSUI		Cap Specialty		Pacific Comp		Total		Total Segments		Alleghany Capital		Corporate Activities (2)		Consolidated
	($ in millions)
Gross premiums written	$	1,173.3	$	2,136.7	$	3,310.0	$	808.3	$	201.5	$	105.9	$	1,115.7	$	4,425.7	$	-	$	(19.0)	$	4,406.7
Net premiums written		945.1		2,088.3		3,033.4		566.3		189.0		104.5		859.8		3,893.2		-		-		3,893.2
Net premiums earned		857.9		2,030.6		2,888.5		567.4		175.8		104.9		848.1		3,736.6		-		-		3,736.6
Net loss and LAE		454.9		1,282.7		1,737.6		289.0		92.4		79.5		460.9		2,198.5		-		-		2,198.5
Commissions, brokerage and other underwriting expenses		275.6		693.6		969.2		161.9		78.7		28.9		269.5		1,238.7		-		-		1,238.7
Underwriting profit (loss) (3)	$	127.4	$	54.3	$	181.7	$	116.5	$	4.7	$	(3.5)	$	117.7		299.4		-		-		299.4
Net investment income																326.4		-		5.9		332.3
Net realized capital gains																107.6		13.0		(3.5)		117.1
Other than temporary impairment losses																(38.2)		-		-		(38.2)
Other revenue																3.8		517.3		6.7		527.8
Other operating expenses																65.1		508.0		2.4		575.5
Corporate administration																1.0		-		33.0		34.0
Amortization of intangible assets																(2.4)		16.9		-		14.5
Interest expense																20.6		1.2		39.6		61.4
Earnings (losses) before income taxes															$	614.7	$	4.2	$	(65.9)	$	553.0

(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, net realized capital gains, OTTI losses, other 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 segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes 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.

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Summary of Significant Accounting Principles - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	9 Months Ended
	Mar. 06, 2012	Dec. 31, 2017	Sep. 30, 2017	Sep. 12, 2017	Aug. 01, 2017	Apr. 28, 2017	Apr. 15, 2016
Pacific Comp
Significant Accounting Policies [Line Items]
Agreement to sell				$ 150.0
Assets held for sale			$ 440.6
Liabilities held for sale			$ 313.7
Wilbert Funeral Services, Inc
Significant Accounting Policies [Line Items]
Equity interest percentage					45.00%
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			20.00%
WWSC Holdings, LLC
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners			20.00%
TransRe
Significant Accounting Policies [Line Items]
Business acquisition date	Mar. 06, 2012
WWSC Holdings, LLC
Significant Accounting Policies [Line Items]
Business acquisition date			Apr. 28, 2017
Ownership interest acquired						80.00%
Jazwares, LLC
Significant Accounting Policies [Line Items]
Ownership interest acquired							50.00%
Ownership Percentage by Parent							80.00%
Scenario Forecast | Pacific Comp
Significant Accounting Policies [Line Items]
Expected gain on sale of business, after tax		$ 25.0

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Carrying Value and Estimated Fair Value of Consolidated Financial Instruments (Detail) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Assets
Investments (excluding equity method investments and loans)	[1]	$ 17,590.2	$ 16,899.2
Liabilities
Senior Notes and other debt	[2]	1,655.5	1,584.3
Carrying Value
Assets
Investments (excluding equity method investments and loans)	[1]	17,590.2	16,899.2
Liabilities
Senior Notes and other debt	[2]	$ 1,486.4	$ 1,476.5

[1] This table includes AFS investments (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 2016 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		Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		$ 3,821,601	$ 3,109,523
Estimated fair value of available for sale debt securities		13,212,395	12,983,213
Estimated fair values of financial instruments		17,581,800	16,871,100
Total investments (excluding equity method investments and loans)	[1]	17,590,200	16,899,200
Senior Notes and other debt	[2]	1,655,500	1,584,300
Equity Securities | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		3,816,600	3,109,500
Equity Securities | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		5,000
Debt Securities | 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		1,020,700	1,243,300
Debt Securities | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		4,131,700	4,185,800
Debt Securities | 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		1,140,900	1,047,100
Debt Securities | 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		2,481,000	2,193,100
Debt Securities | 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		1,294,200	1,088,800
Debt Securities | Mortgage and asset backed securities | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[3]	954,200	1,000,400
Debt Securities | Mortgage and asset backed securities | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		516,900	734,800
Debt Securities | Mortgage and asset backed securities | 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]	1,672,800	1,489,900
Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair values of financial instruments		547,800	778,400
Other invested assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair values of financial instruments	[5]	8,400	28,100
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		3,815,200	3,105,200
Total investments (excluding equity method investments and loans)		3,815,200	3,105,200
Level 1 | Equity Securities | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		3,815,200	3,105,200
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		500
Estimated fair value of available for sale debt securities		11,689,700	11,995,900
Total investments (excluding equity method investments and loans)		12,238,000	12,774,300
Senior Notes and other debt		1,553,000	1,491,500
Level 2 | Equity Securities | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		500
Level 2 | Debt Securities | 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		1,020,700	1,243,300
Level 2 | Debt Securities | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		4,131,700	4,185,800
Level 2 | Debt Securities | 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		1,136,200	1,047,100
Level 2 | Debt Securities | 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		2,202,200	2,120,200
Level 2 | Debt Securities | 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		1,254,300	1,088,400
Level 2 | Debt Securities | Mortgage and asset backed securities | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[3]	948,800	994,500
Level 2 | Debt Securities | Mortgage and asset backed securities | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		505,500	730,500
Level 2 | Debt Securities | Mortgage and asset backed securities | 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]	490,300	586,100
Level 2 | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair values of financial instruments		547,800	778,400
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		5,900	4,300
Estimated fair value of available for sale debt securities		1,522,700	987,300
Total investments (excluding equity method investments and loans)		1,537,000	1,019,700
Senior Notes and other debt		102,500	92,800
Level 3 | Equity Securities | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		900	4,300
Level 3 | Equity Securities | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale equities		5,000
Level 3 | Debt Securities | 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		4,700
Level 3 | Debt Securities | 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		278,800	72,900
Level 3 | Debt Securities | 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		39,900	400
Level 3 | Debt Securities | Mortgage and asset backed securities | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[3]	5,400	5,900
Level 3 | Debt Securities | Mortgage and asset backed securities | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		11,400	4,300
Level 3 | Debt Securities | Mortgage and asset backed securities | 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]	1,182,500	903,800
Level 3 | Other invested assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair values of financial instruments	[5]	$ 8,400	$ 28,100

[1] This table includes AFS investments (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 2016 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 $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

[5] Includes partnership and non-marketable equity investments accounted for on an AFS basis, 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		Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		$ 13,212,395	$ 12,983,213
Other asset-backed securities | Debt Securities | Mortgage and 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]	1,672,800	1,489,900
Other asset-backed securities | Debt Securities | Mortgage and asset backed securities | Collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		$ 1,146,200	$ 903,800

[1] Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3		$ 0		$ 7,200,000	$ 5,400,000
Gross transfers into Level 3		$ 800,000	$ 5,700,000	5,500,000	8,400,000
Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3			$ 5,100,000		5,400,000
Debt Securities | U.S. corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3				4,800,000	5,100,000
Gross transfers into Level 3				3,800,000	5,500,000
Debt Securities | Foreign corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers into Level 3				300,000	1,900,000
Equity Securities | Common Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3				2,400,000
Gross transfers into Level 3				$ 1,400,000	1,000,000
Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3	[1]				$ 300,000

[1] Includes partnership and non-marketable equity investments accounted for on an AFS basis.

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Reconciliations of Changes in Level Three Assets Measured at Fair Value (Detail) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				$ 1,019,700,000	$ 1,067,800,000
Net realized/unrealized gains (losses) included in:
Net earnings	[1]			14,700,000	6,000,000
Other comprehensive income				10,700,000	25,500,000
Purchases				1,025,600,000	73,700,000
Sales				(96,900,000)	(104,600,000)
Issuances				0	0
Settlements				(435,100,000)	(37,300,000)
Transfers into Level 3		$ 800,000	$ 5,700,000	5,500,000	8,400,000
Transfers out of Level 3		0		(7,200,000)	(5,400,000)
Ending balance		1,537,000,000	1,034,100,000	1,537,000,000	1,034,100,000
Equity Securities | Common Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				4,300,000
Net realized/unrealized gains (losses) included in:
Net earnings	[1]			200,000	(100,000)
Other comprehensive income					1,800,000
Purchases					2,200,000
Sales				(2,600,000)
Issuances				0	0
Transfers into Level 3				1,400,000	1,000,000
Transfers out of Level 3				(2,400,000)
Ending balance		900,000	4,900,000	900,000	4,900,000
Equity Securities | Preferred Stock
Net realized/unrealized gains (losses) included in:
Net earnings	[1]			(200,000)
Other comprehensive income				200,000
Purchases				5,600,000
Sales				(600,000)
Issuances				0
Ending balance		5,000,000		5,000,000
Debt Securities
Net realized/unrealized gains (losses) included in:
Transfers out of Level 3			(5,100,000)		(5,400,000)
Debt Securities | Foreign government obligations
Net realized/unrealized gains (losses) included in:
Purchases				4,700,000
Issuances				0
Ending balance		4,700,000		4,700,000
Debt Securities | U.S. corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				72,900,000	49,800,000
Net realized/unrealized gains (losses) included in:
Net earnings	[1]			(200,000)	(500,000)
Other comprehensive income				3,200,000	1,400,000
Purchases				220,400,000	39,400,000
Sales				(10,200,000)	(14,500,000)
Issuances				0	0
Settlements				(6,300,000)	(1,700,000)
Transfers into Level 3				3,800,000	5,500,000
Transfers out of Level 3				(4,800,000)	(5,100,000)
Ending balance		278,800,000	74,300,000	278,800,000	74,300,000
Debt Securities | Foreign corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				400,000
Net realized/unrealized gains (losses) included in:
Other comprehensive income				800,000
Purchases				38,600,000
Sales				(200,000)
Issuances				0	0
Transfers into Level 3				300,000	1,900,000
Ending balance		39,900,000	1,900,000	39,900,000	1,900,000
Debt Securities | Mortgage and asset backed securities | RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				5,900,000	14,900,000
Net realized/unrealized gains (losses) included in:
Net earnings	[1]			200,000	300,000
Other comprehensive income				300,000	(700,000)
Sales					(7,000,000)
Issuances				0	0
Settlements				(1,000,000)	(1,500,000)
Ending balance		5,400,000	6,000,000	5,400,000	6,000,000
Debt Securities | Mortgage and asset backed securities | CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				4,300,000	20,200,000
Net realized/unrealized gains (losses) included in:
Net earnings	[1]				(100,000)
Other comprehensive income				100,000	800,000
Purchases				9,600,000
Sales				(2,200,000)	(8,200,000)
Issuances				0	0
Settlements				(400,000)	(500,000)
Ending balance		11,400,000	12,200,000	11,400,000	12,200,000
Debt Securities | Mortgage and asset backed securities | Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				903,800,000	953,000,000
Net realized/unrealized gains (losses) included in:
Net earnings	[1]			3,900,000	2,200,000
Other comprehensive income				15,000,000	25,100,000
Purchases				746,700,000	32,100,000
Sales				(59,500,000)	(70,700,000)
Issuances				0	0
Settlements				(427,400,000)	(33,600,000)
Ending balance		1,182,500,000	908,100,000	1,182,500,000	908,100,000
Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	[2]			28,100,000	29,900,000
Net realized/unrealized gains (losses) included in:
Net earnings	[1],[2]			10,800,000	4,200,000
Other comprehensive income	[2]			(8,900,000)	(2,900,000)
Sales	[2]			(21,600,000)	(4,200,000)
Issuances	[2]			0	0
Transfers out of Level 3	[2]				(300,000)
Ending balance	[2]	$ 8,400,000	$ 26,700,000	$ 8,400,000	$ 26,700,000

[1] There were no other than temporary impairment ("OTTI") losses recorded in net earnings related to Level 3 assets still held as of September 30, 2017 and 2016.

[2] Includes partnership and non-marketable equity investments accounted for on an AFS basis.

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Amortized Cost or Cost and Fair Value of Available For Sale Securities (Detail) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost		$ 16,750,200	$ 16,522,100
Gross Unrealized Gains		907,300	512,800
Gross Unrealized Losses		(75,700)	(163,800)
Fair Value		17,581,800	16,871,100
Equity securities, cost		3,174,837	2,816,572
Equity securities, gross unrealized gains		663,000	332,100
Equity securities, gross unrealized losses		(16,200)	(39,200)
Equity securities, fair value		3,821,601	3,109,523
Debt securities, amortized cost		13,027,581	12,927,103
Debt securities, gross unrealized gains		244,300	180,700
Debt securities, gross unrealized losses		(59,500)	(124,600)
Debt securities, fair value		13,212,395	12,983,213
Debt Securities | U.S. Government obligations
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		1,033,100	1,265,700
Debt securities, gross unrealized gains		1,600	2,200
Debt securities, gross unrealized losses		(14,000)	(24,600)
Debt securities, fair value		1,020,700	1,243,300
Debt Securities | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		4,039,600	4,161,000
Debt securities, gross unrealized gains		106,900	66,900
Debt securities, gross unrealized losses		(14,800)	(42,100)
Debt securities, fair value		4,131,700	4,185,800
Debt Securities | Foreign government obligations
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		1,134,600	1,030,900
Debt securities, gross unrealized gains		14,000	20,200
Debt securities, gross unrealized losses		(7,700)	(4,000)
Debt securities, fair value		1,140,900	1,047,100
Debt Securities | U.S. corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		2,425,600	2,168,900
Debt securities, gross unrealized gains		63,600	43,500
Debt securities, gross unrealized losses		(8,200)	(19,300)
Debt securities, fair value		2,481,000	2,193,100
Debt Securities | Foreign corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		1,270,500	1,068,300
Debt securities, gross unrealized gains		27,100	27,300
Debt securities, gross unrealized losses		(3,400)	(6,800)
Debt securities, fair value		1,294,200	1,088,800
Debt Securities | Mortgage and asset backed securities | RMBS
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		953,900	1,005,900
Debt securities, gross unrealized gains		7,700	7,000
Debt securities, gross unrealized losses		(7,400)	(12,500)
Debt securities, fair value	[1]	954,200	1,000,400
Debt Securities | Mortgage and asset backed securities | CMBS
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		509,200	728,800
Debt securities, gross unrealized gains		10,000	9,600
Debt securities, gross unrealized losses		(2,300)	(3,600)
Debt securities, fair value		516,900	734,800
Debt Securities | Mortgage and asset backed securities | Other asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost	[2]	1,661,100	1,497,600
Debt securities, gross unrealized gains	[2]	13,400	4,000
Debt securities, gross unrealized losses	[2]	(1,700)	(11,700)
Debt securities, fair value	[2]	1,672,800	1,489,900
Equity Securities | Common Stock
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost		3,170,000	2,816,600
Equity securities, gross unrealized gains		662,800	332,100
Equity securities, gross unrealized losses		(16,200)	(39,200)
Equity securities, fair value		3,816,600	3,109,500
Equity Securities | Preferred Stock
Schedule of Available-for-sale Securities [Line Items]
Equity securities, cost		4,800
Equity securities, gross unrealized gains		200
Equity securities, fair value		5,000
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost		547,800	778,400
Fair Value		$ 547,800	$ 778,400

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

[2] Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

XML

Amortized Cost or Cost and Fair Value of Available For Sale Securities (Parenthetical) (Detail) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available for sale debt securities		$ 13,212,395	$ 12,983,213
Other asset-backed securities | Debt Securities | Mortgage and asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available for sale debt securities	[1]	1,672,800	1,489,900
Other asset-backed securities | Debt Securities | Mortgage and asset backed securities | Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available for sale debt securities		$ 1,146,200	$ 903,800

[1] Includes $1,146.2 million and $903.8 million of collateralized loan obligations as of September 30, 2017 and December 31, 2016, respectively.

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Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Short-term investments due in one year or less, amortized cost or cost		$ 547,787	$ 778,410
Mortgage and asset-backed securities, amortized cost or cost	[1]	3,124,200
Debt securities with maturity dates, amortized cost or cost:
One year or less		385,200
Over one through five years		3,089,600
Over five through ten years		3,359,400
Over ten years		3,069,200
Debt securities, amortized cost		13,027,581	12,927,103
Equity securities, cost		3,174,837	2,816,572
Amortized Cost or Cost		16,750,200	16,522,100
Short-term investments due in one year or less, fair value		547,800
Mortgage and asset-backed securities, fair value	[1]	3,143,900
Debt securities with maturity dates, fair value:
One year or less		386,100
Over one through five years		3,124,600
Over five through ten years		3,414,900
Over ten years		3,142,900
Total debt securities, fair value		13,212,395	12,983,213
Equity securities, fair value		3,821,601	3,109,523
Fair Value		$ 17,581,800	$ 16,871,100

[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		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Investment Income [Line Items]
Interest income		$ 104,600	$ 99,000	$ 306,300	$ 299,000
Dividend income		6,700	12,200	27,900	35,500
Investment expenses		(5,800)	(6,200)	(20,100)	(19,800)
Other investment results		1,700	5,100	11,100	(400)
Net investment income		104,663	120,603	321,857	332,326
Ares
Net Investment Income [Line Items]
Equity results	[1]	6,900	4,600	(400)	5,100
Pillar Holdings and Funds | Pillar Capital Holdings Limited And Managed Funds
Net Investment Income [Line Items]
Equity results	[1]	$ (9,400)	$ 5,900	$ (2,900)	$ 12,900

[1] See Note 3(g) of this Form 10-Q for discussion of the Pillar Investments and the investment in Ares, each as defined therein.

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Investments - Additional Information (Detail)		1 Months Ended		3 Months Ended		9 Months Ended
	Apr. 15, 2016 USD ($)	Jul. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2017 USD ($) Investment	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Investment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Apr. 14, 2016	May 31, 2014
Investment [Line Items]
Proceeds from sales of AFS securities				$ 1,600,000,000	$ 800,000,000	$ 5,800,000,000	$ 5,200,000,000
Securities impairment test description						Management’s assessment of equity securities initially involves an evaluation of all securities that are in an unrealized loss position, regardless of the duration or severity of the loss, as of the applicable balance sheet date. Such initial review consists primarily of assessing whether: (i) there has been a negative credit or news event with respect to the issuer that could indicate the existence of an OTTI; and (ii) Alleghany has the ability and intent to hold an equity security for a period of time sufficient to allow for an anticipated recovery (generally considered to be 12 months from the balance sheet date). To the extent that an equity security in an unrealized loss position is not impaired based on the initial review described above, Alleghany then further evaluates such equity security and deems it to be other than temporarily impaired if it has been in an unrealized loss position for 12 months or more or if its unrealized loss position is greater than 50 percent of its cost, absent compelling evidence to the contrary.Alleghany then evaluates those equity securities where the unrealized loss is at least 20 percent of cost as of the balance sheet date or that have been in an unrealized loss position continuously for six months or more preceding the balance sheet date. This evaluation takes into account quantitative and qualitative factors in determining whether such securities are other than temporarily impaired including: (i) market valuation metrics associated with the equity security (such as dividend yield and price-to-earnings ratio); (ii) current views on the equity security, as expressed by either Alleghany’s internal stock analysts and/or by third-party stock analysts or rating agencies; and (iii) credit or news events associated with a specific issuer, such as negative news releases and rating agency downgrades with respect to the issuer of the equity security. 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				$ 6,131,000	$ 11,729,000	$ 13,095,000	38,216,000
Number of debt and equity securities in an unrealized loss position | Investment				1,111		1,111
Percentage of debt securities owned with credit rating below investment grade or not rated				7.30%		7.30%		5.10%
Other invested assets				$ 739,339,000		$ 739,339,000		$ 645,245,000
Jazwares, LLC
Investment [Line Items]
Ownership interest acquired	50.00%
Gain on acquisition	$ 13,200,000						13,200,000
Jazwares, LLC
Investment [Line Items]
Ownership interest percentage									30.00%
Pillar Capital Holdings Limited And Managed Funds | Pillar Holdings and Funds
Investment [Line Items]
Other invested assets				216,700,000		216,700,000
Pillar Capital Holdings Limited And Managed Funds | Pillar Holdings and Funds | Reinsurance Segment
Investment [Line Items]
Investment in other invested asset			$ 175,000,000
Pillar Capital Holdings Limited And Managed Funds | Pillar Holdings and Funds | Insurance Segment
Investment [Line Items]
Investment in other invested asset			$ 25,000,000
Ares
Investment [Line Items]
Other invested assets				213,900,000		$ 213,900,000
Investment in other invested asset		$ 250,000,000
Percentage of equity stake		6.25%
Potential ownership interest, upon conversion of limited partner equity interests into common stock										5.90%
Conversion of investment interest description						These interests may be converted at any time at Alleghany's discretion.
Commercial Mortgage Loan Portfolio
Investment [Line Items]
Commercial mortgage loans				649,700,000		$ 649,700,000		$ 594,878,000
Allowance for loan losses on commercial mortgage loans				$ 0		0
Equity Securities
Investment [Line Items]
Other than temporary impairment losses						11,800,000	16,600,000
Debt Securities
Investment [Line Items]
Other than temporary impairment losses						$ 1,300,000	$ 21,600,000
Number of securities in an unrealized loss position for 12 months or more | Investment				363		363
Minimum | Commercial Mortgage Loan Portfolio
Investment [Line Items]
Term of commercial mortgage loans						2 years
Minimum | Equity Securities
Investment [Line Items]
Percentage of unrealized loss to cost where a security would be deemed to be other than temporarily impaired, absent compelling evidence to the contrary						50.00%
Percentage of unrealized loss to cost where a security would be evaluated for other than temporarily impairment						20.00%
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
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						66.67%

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Amounts of Gross Realized Capital Gains and Gross Realized Capital Losses of Available For Sale Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gain (Loss) on Investments [Line Items]
Gross realized capital gains	$ 47,000	$ 32,700	$ 189,700	$ 217,700
Gross realized capital losses	(14,100)	(5,500)	(87,900)	(100,600)
Net realized capital gains	$ 32,921	$ 27,221	$ 101,840	$ 117,126

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Gross Unrealized Losses and Related Fair Values for Equity Securities and Debt Securities Grouped by Duration of Time in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	$ 3,760.1	$ 5,491.7
Securities, less than 12 months, gross unrealized losses	41.7	146.6
Securities, 12 months or more, fair value	1,266.3	809.8
Securities, 12 months or more, gross unrealized losses	34.0	17.2
Total, fair value	5,026.4	6,301.5
Total, gross unrealized losses	75.7	163.8
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	998.5	619.4
Securities, less than 12 months, gross unrealized losses	16.2	39.2
Total, fair value	998.5	619.4
Total, gross unrealized losses	16.2	39.2
Equity Securities | Common Stock
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	998.5	619.4
Securities, less than 12 months, gross unrealized losses	16.2	39.2
Total, fair value	998.5	619.4
Total, gross unrealized losses	16.2	39.2
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	2,761.6	4,872.3
Securities, less than 12 months, gross unrealized losses	25.5	107.4
Securities, 12 months or more, fair value	1,266.3	809.8
Securities, 12 months or more, gross unrealized losses	34.0	17.2
Total, fair value	4,027.9	5,682.1
Total, gross unrealized losses	59.5	124.6
Debt Securities | U.S. Government obligations
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	626.0	975.0
Securities, less than 12 months, gross unrealized losses	5.9	24.6
Securities, 12 months or more, fair value	242.9
Securities, 12 months or more, gross unrealized losses	8.1
Total, fair value	868.9	975.0
Total, gross unrealized losses	14.0	24.6
Debt Securities | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	404.5	1,464.5
Securities, less than 12 months, gross unrealized losses	2.5	39.7
Securities, 12 months or more, fair value	358.4	41.6
Securities, 12 months or more, gross unrealized losses	12.3	2.4
Total, fair value	762.9	1,506.1
Total, gross unrealized losses	14.8	42.1
Debt Securities | Foreign government obligations
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	408.2	238.3
Securities, less than 12 months, gross unrealized losses	4.9	4.0
Securities, 12 months or more, fair value	76.0
Securities, 12 months or more, gross unrealized losses	2.8
Total, fair value	484.2	238.3
Total, gross unrealized losses	7.7	4.0
Debt Securities | U.S. corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	399.3	727.9
Securities, less than 12 months, gross unrealized losses	5.0	18.1
Securities, 12 months or more, fair value	206.3	52.6
Securities, 12 months or more, gross unrealized losses	3.2	1.2
Total, fair value	605.6	780.5
Total, gross unrealized losses	8.2	19.3
Debt Securities | Foreign corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	236.6	331.0
Securities, less than 12 months, gross unrealized losses	1.6	6.6
Securities, 12 months or more, fair value	117.3	4.1
Securities, 12 months or more, gross unrealized losses	1.8	0.2
Total, fair value	353.9	335.1
Total, gross unrealized losses	3.4	6.8
Debt Securities | Mortgage and asset backed securities | RMBS
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	429.7	652.0
Securities, less than 12 months, gross unrealized losses	4.7	11.4
Securities, 12 months or more, fair value	132.8	43.4
Securities, 12 months or more, gross unrealized losses	2.7	1.1
Total, fair value	562.5	695.4
Total, gross unrealized losses	7.4	12.5
Debt Securities | Mortgage and asset backed securities | CMBS
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	24.8	148.9
Securities, less than 12 months, gross unrealized losses	0.2	1.4
Securities, 12 months or more, fair value	41.8	117.7
Securities, 12 months or more, gross unrealized losses	2.1	2.2
Total, fair value	66.6	266.6
Total, gross unrealized losses	2.3	3.6
Debt Securities | Mortgage and asset backed securities | Other asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	232.5	334.7
Securities, less than 12 months, gross unrealized losses	0.7	1.6
Securities, 12 months or more, fair value	90.8	550.4
Securities, 12 months or more, gross unrealized losses	1.0	10.1
Total, fair value	323.3	885.1
Total, gross unrealized losses	$ 1.7	$ 11.7

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Activity in the Liability for Loss and Loss Adjustment Expense (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves as of January 1				$ 11,087,199	$ 10,799,200
Less: reinsurance recoverables	[1]			1,236,200	1,169,300
Net reserves as of January 1				9,851,000	9,629,900
Other adjustments				(700)	3,200
Incurred loss and LAE, net of reinsurance, related to:
Current year				3,099,000	2,460,200
Prior years		$ (61,500)	$ (86,400)	(173,000)	(261,700)
Total incurred loss and LAE, net of reinsurance		1,491,848	718,556	2,926,039	2,198,512
Paid loss and LAE, net of reinsurance, related to:
Current year	[2]			390,600	206,000
Prior years	[2]			1,743,200	1,702,700
Total paid loss and LAE, net of reinsurance	[2]			2,133,800	1,908,700
Foreign exchange effect				120,500	(22,600)
Net reserves as of September 30		10,763,000	9,900,300	10,763,000	9,900,300
Reinsurance recoverables as of September 30	[1]	1,693,400	1,157,800	1,693,400	1,157,800
Reserves as of September 30		$ 12,456,375	$ 11,058,100	$ 12,456,375	$ 11,058,100

[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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Liability for Loss and LAE - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2017	Aug. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Catastrophe losses, net of reinsurance			$ 1,491,848	$ 718,556	$ 2,926,039	$ 2,198,512
Hurricane Harvey
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Catastrophe losses, net of reinsurance		$ 264,600
Hurricane Irma
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Catastrophe losses, net of reinsurance	$ 312,000
Hurricane Maria
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Catastrophe losses, net of reinsurance	$ 170,300

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(Favorable) Unfavorable Prior Accident Year Loss Reserve Development (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Claims Development [Line Items]
Claims incurred related to prior years		$ (61.5)		$ (86.4)		$ (173.0)		$ (261.7)
Reinsurance Segment
Claims Development [Line Items]
Claims incurred related to prior years		(49.8)		(69.0)		(140.8)		(218.0)
Reinsurance Segment | Property
Claims Development [Line Items]
Claims incurred related to prior years		(8.1)		(10.8)		(62.6)		(79.3)
Reinsurance Segment | Property | Property Catastrophe
Claims Development [Line Items]
Claims incurred related to prior years		(7.8)	[1]	(1.2)	[2]	(12.2)	[1]	(9.0)	[2]
Reinsurance Segment | Property | Property Non-catastrophe
Claims Development [Line Items]
Claims incurred related to prior years		(0.3)		(9.6)	[3]	(50.4)	[4]	(70.3)	[3]
Reinsurance Segment | Casualty & Other
Claims Development [Line Items]
Claims incurred related to prior years		(41.7)		(58.2)		(78.2)		(138.7)
Reinsurance Segment | Casualty & Other | Ogden Rate Impact
Claims Development [Line Items]
Claims incurred related to prior years	[5]					24.4
Reinsurance Segment | Casualty & Other | The Medical Malpractice Treaties
Claims Development [Line Items]
Claims incurred related to prior years	[6]			(2.0)		(2.0)		(10.8)
Reinsurance Segment | Casualty & Other | All Other Casualty and Other
Claims Development [Line Items]
Claims incurred related to prior years		(41.7)	[7]	(56.2)	[8]	(100.6)	[9]	(127.9)	[8]
Insurance Segment | RSUI
Claims Development [Line Items]
Claims incurred related to prior years		(8.6)		(16.5)		(27.3)		(40.5)
Insurance Segment | RSUI | Casualty Insurance
Claims Development [Line Items]
Claims incurred related to prior years		(6.9)	[10]	(11.9)	[11]	(28.5)	[10]	(32.1)	[11]
Insurance Segment | RSUI | Property and Other Insurance
Claims Development [Line Items]
Claims incurred related to prior years		(1.7)	[12]	(4.6)	[13]	1.2	[14]	(8.4)	[13]
Insurance Segment | CapSpecialty Incorporated
Claims Development [Line Items]
Claims incurred related to prior years		(2.3)		(0.9)		(3.1)		(3.2)
Insurance Segment | CapSpecialty Incorporated | Asbestos and Environmental
Claims Development [Line Items]
Claims incurred related to prior years								(2.0)
Insurance Segment | CapSpecialty Incorporated | All Other CapSpecialty Incorporated
Claims Development [Line Items]
Claims incurred related to prior years		(2.3)	[15]	$ (0.9)	[16]	(3.1)	[15]	$ (1.2)	[16]
Insurance Segment | Pacific Comp
Claims Development [Line Items]
Claims incurred related to prior years	[17]	$ (0.8)				$ (1.8)

[1] Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2016 accident years.

[2] Reflects favorable prior accident year loss reserve development from several catastrophes that occurred in the 2010 through 2015 accident years.

[3] Reflects favorable prior accident year loss reserve development primarily related to the 2014 through 2015 accident years.

[4] Reflects favorable prior accident year loss reserve development primarily related to the 2013 through 2016 accident years.

[5] Represents unfavorable prior accident year loss reserve development arising from the U.K. Ministry of Justice's decision to significantly reduce 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. As of March 20, 2017, the Ogden rate changed from 2.50 percent to negative 0.75 percent.

[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] Primarily reflects favorable prior accident year loss reserve development in longer-tailed U.S. professional liability lines of business related to older accident years and shorter-tailed casualty lines of business in the U.K. related to recent accident years.

[8] Generally reflects favorable prior accident year loss reserve development in a variety of casualty & other lines of business primarily related to the 2005, 2006 and 2008 through 2015 accident years.

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

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

[11] Primarily reflects favorable prior accident year loss reserve development in the umbrella/excess, general liability and professional liability lines of business related to the 2006 through 2012 accident years.

[12] Primarily reflects favorable unallocated LAE development.

[13] Primarily reflects favorable prior accident year loss reserve development in the non-catastrophe property lines of business in recent accident years.

[14] Primarily reflects unfavorable prior accident year property loss reserve development in the binding authority lines of business primarily related to the 2015 and 2016 accident years, partially offset by favorable catastrophe prior accident year loss reserve development related to the 2016 accident year.

[15] Primarily reflects favorable prior accident year loss reserve development in the casualty lines of business related to the 2010, 2014, 2015 and 2016 accident years.

[16] Primarily reflects favorable prior accident year loss reserve development in the surety lines of business related to the 2015 accident year.

[17] Primarily reflects favorable prior accident year loss reserve development related to 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 ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Effective income tax rate			66.80%	29.30%
Income tax expense	$ (212,379,000)	$ 48,328,000	$ (116,368,000)	$ 162,274,000
Interest or penalties accrued for uncertain tax positions	$ 0		$ 0
Prior Period Adjustments
Income Taxes [Line Items]
Income tax expense				$ 16,100,000

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2017	Nov. 30, 2015	Jul. 31, 2014
Stockholders Equity Note [Line Items]
Par value of common stock	$ 1.00
2014 Repurchase Program
Stockholders Equity Note [Line Items]
Aggregate amount of common stock authorized for repurchase			$ 350.0
2015 Repurchase Program
Stockholders Equity Note [Line Items]
Aggregate amount of common stock authorized for repurchase		$ 400.0
Stock repurchase program, remaining share authorized for repurchase	$ 370.7

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Schedule of Common Stock Repurchases (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule Of Common Share Purchase [Line Items]
Shares repurchased	15,916	4,621	15,916	117,721
Cost of shares repurchased (in millions)	$ 8.5	$ 2.4	$ 8.5	$ 55.7
Average price per share repurchased	$ 537.14	$ 517.40	$ 537.14	$ 472.97

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Reconciliation of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 7,939,945
Other comprehensive income (loss), net of tax:
Reclassifications from accumulated other comprehensive income	$ (17,400)	$ (10,100)	(57,700)	$ (42,700)
Ending Balance	8,201,023		8,201,023
Unrealized Appreciation of Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			232,200	231,900
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications			364,600	238,400
Reclassifications from accumulated other comprehensive income			(57,700)	(42,700)
Total			306,900	195,700
Ending Balance	539,100	427,600	539,100	427,600
Unrealized Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(111,200)	(104,000)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications			22,400	19,200
Total			22,400	19,200
Ending Balance	(88,800)	(84,800)	(88,800)	(84,800)
Retirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(11,700)	(11,600)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications			(200)	400
Total			(200)	400
Ending Balance	(11,900)	(11,200)	(11,900)	(11,200)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			109,300	116,300
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications			386,800	258,000
Reclassifications from accumulated other comprehensive income			(57,700)	(42,700)
Total			329,100	215,300
Ending Balance	$ 438,400	$ 331,600	$ 438,400	$ 331,600

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Reclassifications of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized capital gains		$ (32,921)	$ (27,221)	$ (101,840)	$ (117,126)
Other than temporary impairment losses		6,131	11,729	13,095	38,216
Income taxes		(212,379)	48,328	(116,368)	162,274
Total reclassifications		(17,400)	(10,100)	(57,700)	(42,700)
Unrealized Appreciation of Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications				(57,700)	(42,700)
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]	(32,900)	(27,200)	(101,800)	(103,900)
Other than temporary impairment losses		6,100	11,700	13,100	38,200
Income taxes		$ 9,400	$ 5,400	$ 31,000	$ 23,000

[1] Net realized capital gains for the nine months ended September 30, 2016 exclude the Jazwares Remeasurement Gain of $13.2 million.

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Reclassifications of Accumulated Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Millions		9 Months Ended
	Apr. 15, 2016	Sep. 30, 2016
Jazwares, LLC
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on acquisition	$ 13.2	$ 13.2

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Reconciliation of Earnings and Share Data used in Basic and Diluted (Losses) Earnings per Share Computations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share Disclosure [Line Items]
Net (losses) earnings available to Alleghany stockholders	$ (314,157)	$ 155,831	$ (63,170)	$ 387,407
Effect of dilutive securities	(8,900)
(Losses) Income available to common stockholders for diluted earnings per share	$ (323,100)	$ 155,800	$ (63,200)	$ 387,400
Weighted average common shares outstanding applicable to basic earnings per share	15,416,014	15,438,399	15,416,249	15,443,150
Effect of dilutive securities	42,310			6,330
Adjusted weighted average common shares outstanding applicable to diluted earnings per share	15,458,324	15,438,399	15,416,249	15,449,480

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Earnings Per Share of Common Stock - Additional Information (Detail) - shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Line Items]
Shares excluded in diluted earnings per share computation	63,567	70,881

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items]
Investments, debt securities	$ 13,212,395	$ 12,983,213
Investments, equity securities	3,821,601	3,109,523
Stockholders' equity	8,201,023	$ 7,939,945
Energy Sector Business
Commitments and Contingencies Disclosure [Line Items]
Investments and equity in consolidated subsidiaries	519,300
Investments, debt securities	319,400
Investments, equity securities	50,700
Energy Sector Business | Stranded Oil Resources Corporation
Commitments and Contingencies Disclosure [Line Items]
Stockholders' equity	$ 149,200

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Segments of Business - Additional Information (Detail) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 28, 2017 USD ($)	Sep. 30, 2017 USD ($) Segment	Sep. 30, 2016 Segment	Sep. 30, 2017 USD ($) Segment	Sep. 30, 2016 Segment	Aug. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Apr. 15, 2016
Segment Reporting Information [Line Items]
Number of reportable segments | Segment		2	2	2	2
Identifiable assets		$ 25,714,235		$ 25,714,235			$ 23,756,591
Stockholders' equity attributable to Alleghany stockholders		8,201,023		8,201,023			7,939,945
Senior Notes and other debt		1,486,375		1,486,375			$ 1,476,489
WWSC Holdings, LLC
Segment Reporting Information [Line Items]
Ownership interest acquired	80.00%
Purchase price for acquisition	$ 164,500
Cash consideration paid for acquisition	163,900
Purchase price adjustments on acquisition	600
Goodwill	39,900
WWSC Holdings, LLC | Trade name
Segment Reporting Information [Line Items]
Indefinite-lived intangible assets acquired	25,300
WWSC Holdings, LLC | customer relationships
Segment Reporting Information [Line Items]
Finite-lived intangible assets acquired	$ 70,000
Estimated useful life	10 years
Jazwares, LLC
Segment Reporting Information [Line Items]
Ownership interest acquired								50.00%
Ownership Percentage by Parent								80.00%
Wilbert Funeral Services, Inc
Segment Reporting Information [Line Items]
Equity interest percentage						45.00%
Cost of equity investment						$ 72,300
Operating Segments | Reinsurance Segment
Segment Reporting Information [Line Items]
Identifiable assets		16,900,000		16,900,000
Cash and invested assets		13,600,000		13,600,000
Stockholders' equity attributable to Alleghany stockholders		5,100,000		5,100,000
Operating Segments | Insurance Segment
Segment Reporting Information [Line Items]
Identifiable assets		7,000,000		7,000,000
Cash and invested assets		5,400,000		5,400,000
Stockholders' equity attributable to Alleghany stockholders		2,800,000		2,800,000
Other activities
Segment Reporting Information [Line Items]
Identifiable assets		1,800,000		1,800,000
Cash and invested assets		700,000		700,000
Stockholders' equity attributable to Alleghany stockholders		300,000		300,000
Other activities | Alleghany Capital Corporation
Segment Reporting Information [Line Items]
Senior Notes and other debt		102,500		102,500
Other activities | WWSC Holdings, LLC | Alleghany Capital Corporation
Segment Reporting Information [Line Items]
Senior Notes and other debt		23,000		23,000
Other activities | Kentucky Trailer | Alleghany Capital Corporation
Segment Reporting Information [Line Items]
Senior Notes and other debt		17,000		17,000
Other activities | Jazwares, LLC | Alleghany Capital Corporation
Segment Reporting Information [Line Items]
Senior Notes and other debt		31,200		31,200
Other activities | Bourn & Koch, Inc. | Alleghany Capital Corporation
Segment Reporting Information [Line Items]
Senior Notes and other debt		15,400		15,400
Other activities | Integrated Project Services LLC | Alleghany Capital Corporation
Segment Reporting Information [Line Items]
Senior Notes and other debt		$ 15,900		$ 15,900

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Results for Reportable Segments and Other Activities (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Gross premiums written		$ 1,471,800	$ 1,407,900	$ 4,342,700	$ 4,406,700
Net premiums written		1,260,300	1,236,700	3,786,500	3,893,200
Net premiums earned		1,239,721	1,253,515	3,692,838	3,736,596
Net loss and LAE		1,491,848	718,556	2,926,039	2,198,512
Commissions, brokerage and other underwriting expenses		398,163	423,042	1,220,415	1,238,712
Underwriting profit (loss)	[1]	(650,400)	111,900	(453,600)	299,400
Net investment income		104,663	120,603	321,857	332,326
Net realized capital gains		32,921	27,221	101,840	117,126
Other than temporary impairment losses		(6,131)	(11,729)	(13,095)	(38,216)
Other revenue		296,309	225,006	650,413	527,765
Other operating expenses		277,918	228,408	678,226	575,527
Corporate administration		(4,689)	10,745	26,601	33,938
Amortization of intangible assets		5,765	6,008	14,140	14,490
Interest expense		20,804	20,682	62,728	61,384
(Losses) earnings before income taxes		(522,326)	207,175	(174,296)	553,034
Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written		1,477,100	1,415,400	4,359,200	4,425,700
Net premiums written		1,260,300	1,236,700	3,786,500	3,893,200
Net premiums earned		1,239,700	1,253,500	3,692,800	3,736,600
Net loss and LAE		1,491,900	718,600	2,926,000	2,198,500
Commissions, brokerage and other underwriting expenses		398,200	423,000	1,220,400	1,238,700
Underwriting profit (loss)	[1]	(650,400)	111,900	(453,600)	299,400
Net investment income		101,400	118,700	311,700	326,400
Net realized capital gains		21,500	27,100	90,800	107,600
Other than temporary impairment losses		(6,100)	(11,700)	(13,100)	(38,200)
Other revenue		4,700	300	10,500	3,800
Other operating expenses		8,300	23,600	57,400	65,100
Corporate administration		(1,500)	300	200	1,000
Amortization of intangible assets		(300)	(700)	(1,200)	(2,400)
Interest expense		6,600	6,800	20,200	20,600
(Losses) earnings before income taxes		(542,000)	216,300	(130,300)	614,700
Operating Segments | Reinsurance Segment
Segment Reporting Information [Line Items]
Gross premiums written		1,126,600	1,065,400	3,227,700	3,310,000
Net premiums written		978,500	966,900	2,906,700	3,033,400
Net premiums earned		953,200	969,400	2,836,800	2,888,500
Net loss and LAE		1,119,200	562,200	2,249,300	1,737,600
Commissions, brokerage and other underwriting expenses		308,900	333,100	946,600	969,200
Underwriting profit (loss)	[1]	(474,900)	74,100	(359,100)	181,700
Operating Segments | Reinsurance Segment | Property
Segment Reporting Information [Line Items]
Gross premiums written		445,500	400,200	1,190,000	1,173,300
Net premiums written		329,000	320,500	931,400	945,100
Net premiums earned		310,800	314,600	868,100	857,900
Net loss and LAE		659,900	157,600	904,600	454,900
Commissions, brokerage and other underwriting expenses		105,200	105,400	283,700	275,600
Underwriting profit (loss)	[1]	(454,300)	51,600	(320,200)	127,400
Operating Segments | Reinsurance Segment | Casualty & Other
Segment Reporting Information [Line Items]
Gross premiums written	[2]	681,100	665,200	2,037,700	2,136,700
Net premiums written	[2]	649,500	646,400	1,975,300	2,088,300
Net premiums earned	[2]	642,400	654,800	1,968,700	2,030,600
Net loss and LAE	[2]	459,300	404,600	1,344,700	1,282,700
Commissions, brokerage and other underwriting expenses	[2]	203,700	227,700	662,900	693,600
Underwriting profit (loss)	[1],[2]	(20,600)	22,500	(38,900)	54,300
Operating Segments | Insurance Segment
Segment Reporting Information [Line Items]
Gross premiums written		350,500	350,000	1,131,500	1,115,700
Net premiums written		281,800	269,800	879,800	859,800
Net premiums earned		286,500	284,100	856,000	848,100
Net loss and LAE		372,700	156,400	676,700	460,900
Commissions, brokerage and other underwriting expenses		89,300	89,900	273,800	269,500
Underwriting profit (loss)	[1]	(175,500)	37,800	(94,500)	117,700
Operating Segments | Insurance Segment | RSUI
Segment Reporting Information [Line Items]
Gross premiums written		234,600	243,700	794,100	808,300
Net premiums written		170,800	168,300	558,000	566,300
Net premiums earned		179,000	186,800	540,300	567,400
Net loss and LAE		305,400	94,800	479,700	289,000
Commissions, brokerage and other underwriting expenses		50,300	53,900	158,300	161,900
Underwriting profit (loss)	[1]	(176,700)	38,100	(97,700)	116,500
Operating Segments | Insurance Segment | CapSpecialty Incorporated
Segment Reporting Information [Line Items]
Gross premiums written		74,300	68,500	213,200	201,500
Net premiums written		69,500	64,400	198,900	189,000
Net premiums earned		66,100	61,600	192,200	175,800
Net loss and LAE		37,000	34,500	105,700	92,400
Commissions, brokerage and other underwriting expenses		28,400	26,400	83,300	78,700
Underwriting profit (loss)	[1]	700	700	3,200	4,700
Operating Segments | Insurance Segment | Pacific Comp
Segment Reporting Information [Line Items]
Gross premiums written		41,600	37,800	124,200	105,900
Net premiums written		41,500	37,100	122,900	104,500
Net premiums earned		41,400	35,700	123,500	104,900
Net loss and LAE		30,300	27,100	91,300	79,500
Commissions, brokerage and other underwriting expenses		10,600	9,600	32,200	28,900
Underwriting profit (loss)	[1]	500	(1,000)		(3,500)
Other activities | Alleghany Capital Corporation
Segment Reporting Information [Line Items]
Net investment income		1,600		2,100
Net realized capital gains		700	100	900	13,000
Other revenue		291,700	218,600	634,300	517,300
Other operating expenses		269,100	203,600	618,200	508,000
Amortization of intangible assets		6,000	6,700	15,400	16,900
Interest expense		1,200	600	3,000	1,200
(Losses) earnings before income taxes		17,700	7,800	700	4,200
Other activities | Corporate activities
Segment Reporting Information [Line Items]
Gross premiums written	[3]	(5,300)	(7,500)	(16,500)	(19,000)
Net investment income	[3]	1,700	1,900	8,100	5,900
Net realized capital gains	[3]	10,700		10,100	(3,500)
Other revenue	[3]	(100)	6,100	5,600	6,700
Other operating expenses	[3]	500	1,200	2,600	2,400
Corporate administration	[3]	(3,200)	10,400	26,400	33,000
Interest expense	[3]	13,000	13,300	39,500	39,600
(Losses) earnings before income taxes	[3]	$ 2,000	$ (16,900)	$ (44,700)	$ (65,900)

[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, net realized capital gains, OTTI losses, other 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 segments' operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes 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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Credit Agreements - Additional Information (Detail) - Alleghany Corporation - USD ($)		2 Months Ended	7 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Jul. 31, 2017	Jul. 30, 2017
Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility, initiation date	Jul. 31, 2017
Line of credit facility, term	5 years
Revolving credit facility, maximum borrowing capacity	$ 300,000,000		$ 300,000,000
Revolving credit facility expiration date	Jul. 31, 2022
Borrowings		$ 0
Prior Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity				$ 200,000,000
Revolving credit facility expiration date	Jul. 31, 2017
Borrowings			$ 0