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 March 31, 2020

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	51-0283071
State or Other Jurisdiction of	I.R.S. Employer Identification No.
Incorporation or Organization
1411 Broadway, 34th Floor, NY, NY	10018
Address of Principal Executive Offices	Zip Code

212-752-1356

Registrant’s Telephone Number, Including Area Code

Former Name, Former Address and Former Fiscal Year, if Changed Since Last Report

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $1.00 par value	Y	New York Stock Exchange

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 every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes ☒    No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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 ☐
Non-accelerated filer ☐	Smaller reporting company ☐
Emerging growth 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 registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes ☐    No ☒

APPLICABLE ONLY TO ISSUERS INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PRECEDING FIVE YEARS:

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.      Yes ☐    No ☐

APPLICABLE ONLY TO CORPORATE ISSUERS

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

14,309,682 Shares, par value $1.00 per share, as of April 26, 2020

ALLEGHANY CORPORATION

TABLE OF CONTENTS

		Page
PART I
ITEM 1.	Financial Statements	1
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	25
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk	53
ITEM 4.	Controls and Procedures	55
PART II
ITEM 1.	Legal Proceedings	56
ITEM 1A.	Risk Factors	56
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	58
ITEM 6.	Exhibits	59
SIGNATURES		60

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements.

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Balance Sheets

	March 31,			December 31,
	2020			2019
	(unaudited)
	($ in thousands, except share amounts)
Assets
Investments:
Securities at fair value:
Equity securities (cost: 2020 – $1,358,265; 2019 – $1,625,256)	$	1,710,193		$	2,505,496
Debt securities (amortized cost: 2020 – $13,320,808; 2019 – $13,798,576;
allowance for credit losses: 2020 – $31,375)		13,337,754			14,211,745
Short-term investments		536,105			914,776
		15,584,052			17,632,017
Commercial mortgage loans		682,655			686,206
Other invested assets		541,512			573,605
Total investments		16,808,219			18,891,828
Cash		1,555,185			1,179,098
Accrued investment income		94,301			96,516
Premium balances receivable		1,091,980			948,010
Reinsurance recoverables		1,628,649			1,681,962
Ceded unearned premiums		266,173			248,153
Deferred acquisition costs		541,040			522,577
Property and equipment at cost, net of accumulated depreciation and amortization		208,300			205,397
Goodwill		530,228			523,021
Intangible assets, net of amortization		688,233			685,953
Current taxes receivable		30,791			4,081
Net deferred tax assets		189,814			5,860
Funds held under reinsurance agreements		779,272			755,515
Other assets		1,340,756			1,183,633
Total assets	$	25,752,941		$	26,931,604
Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity
Loss and loss adjustment expenses	$	12,066,438		$	11,928,359
Unearned premiums		2,668,409			2,566,170
Senior notes and other debt		1,514,381			1,751,113
Reinsurance payable		184,779			188,399
Other liabilities		1,253,511			1,516,076
Total liabilities		17,687,518			17,950,117
Redeemable noncontrolling interests		208,361			204,753
Common stock (shares authorized: 2020 and 2019 – 22,000,000; shares issued:    2020 and 2019 – 17,459,961)		17,460			17,460
Contributed capital		3,610,137			3,608,638
Accumulated other comprehensive income (loss)		(129,343	)		171,350
Treasury stock, at cost (2020 – 3,150,279 shares; 2019 – 3,095,333 shares)		(1,496,554	)		(1,455,877	)
Retained earnings		5,855,362			6,435,163
Total stockholders’ equity attributable to Alleghany stockholders		7,857,062			8,776,734
Total liabilities, redeemable noncontrolling interests and stockholders’ equity	$	25,752,941		$	26,931,604

See accompanying Notes to Unaudited Consolidated Financial Statements.

1

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Earnings and Comprehensive Income

(unaudited)

	Three Months Ended March 31,
	2020			2019
	($ in thousands, except per share amounts)
Revenues
Net premiums earned	$	1,444,420		$	1,297,309
Net investment income		111,982			123,049
Change in the fair value of equity securities		(522,976	)		392,353
Net realized capital gains		13,026			4,442
Credit losses for available for sale securities		(31,375	)		(10,020	)
Noninsurance revenue		467,849			514,123
Total revenues		1,482,926			2,321,256
Costs and Expenses
Net loss and loss adjustment expenses		1,027,444			792,498
Commissions, brokerage and other underwriting expenses		441,396			420,126
Other operating expenses		466,661			502,418
Corporate administration		(14,307	)		19,369
Amortization of intangible assets		9,568			6,900
Interest expense		18,356			23,531
Total costs and expenses		1,949,118			1,764,842
(Losses) earnings before income taxes		(466,192	)		556,414
Income taxes		(104,720	)		108,512
Net (losses) earnings		(361,472	)		447,902
Net (losses) earnings attributable to noncontrolling interest		(254	)		7,675
Net (losses) earnings attributable to Alleghany stockholders	$	(361,218	)	$	440,227
Net (losses) earnings	$	(361,472	)	$	447,902
Other comprehensive income (loss):
Change in unrealized gains, net of deferred taxes of ($73,534) and $48,749    in 2020 and 2019, respectively		(276,629	)		183,387
Less: reclassification for net realized capital gains and credit losses for available for sale securities, net of taxes of ($2,883) and $1,171 for 2020 and 2019, respectively		(10,848	)		4,407
Change in unrealized currency translation adjustment, net of deferred taxes    of ($3,651) and ($235) for 2020 and 2019, respectively		(13,733	)		(885	)
Retirement plans		517			937
Comprehensive (loss) income		(662,165	)		635,748
Comprehensive (loss) income attributable to noncontrolling interests		(254	)		7,675
Comprehensive (loss)  income attributable to Alleghany stockholders	$	(661,911	)	$	628,073
Basic (losses) earnings per share attributable to Alleghany stockholders	$	(25.19	)	$	30.40
Diluted (losses) earnings per share attributable to Alleghany stockholders		(25.37	)		30.39

See accompanying Notes to Unaudited Consolidated Financial Statements.

2

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Changes in Stockholders’ Equity

(unaudited)

	Three Months Ended March 31, 2020
	Common Stock		Contributed Capital		Accumulated Other Comprehensive Income (loss)			Treasury Stock			Retained Earnings			Total Stockholders' Equity Attributable to Alleghany Shareholders			Redeemable Non- controlling Interest
	($ in thousands, except share amounts)
Balance as of December 31, 2019
(17,459,961 shares of common stock issued; 3,095,333 in treasury)	$	17,460	$	3,608,638	$	171,350		$	(1,455,877	)	$	6,435,163		$	8,776,734		$	204,753
Add (deduct):
Cumulative effect of adoption of new accounting pronouncements		—		—		—			—			(3,570	)		(3,570	)		—
Net (losses)		—		—		—			—			(361,218	)		(361,218	)		(254	)
Other comprehensive income (loss), net of tax:
Retirement plans		—		—		517			—			—			517			—
Change in unrealized appreciation of investments, net		—		—		(287,477	)		—			—			(287,477	)		—
Change in unrealized currency translation adjustment, net		—		—		(13,733	)		—			—			(13,733	)		—
Comprehensive (loss)		—		—		(300,693	)		—			(361,218	)		(661,911	)		(254	)
Dividends paid		—		—		—			—			(215,013	)		(215,013	)		—
Treasury stock repurchase		—		—		—			(44,268	)		—			(44,268	)		—
Other, net		—		1,499		—			3,591			—			5,090			3,862
Balance as of March 31, 2020
(17,459,961 shares of common stock issued; 3,150,279 in treasury)	$	17,460	$	3,610,137	$	(129,343	)	$	(1,496,554	)	$	5,855,362		$	7,857,062		$	208,361

	Three Months Ended March 31, 2019
	Common Stock		Contributed Capital			Accumulated Other Comprehensive Income (loss)			Treasury Stock			Retained Earnings		Total Stockholders' Equity Attributable to Alleghany Shareholders			Redeemable Non- controlling Interest
	($ in thousands, except share amounts)
Balance as of December 31, 2018
(17,459,961 shares of common stock issued; 2,883,452 in treasury)	$	17,460	$	3,612,830		$	(202,003	)	$	(1,312,939	)	$	5,577,362	$	7,692,710		$	169,762
Add (deduct):
Net earnings		—		—			—			—			440,227		440,227			7,675
Other comprehensive income (loss), net of tax:
Retirement plans		—		—			937			—			—		937			—
Change in unrealized appreciation of investments, net		—		—			187,794			—			—		187,794			—
Change in unrealized currency translation adjustment, net		—		—			(885	)		—			—		(885	)		—
Comprehensive income		—		—			187,846			—			440,227		628,073			7,675
Treasury stock repurchase		—		—			—			(80,486	)		—		(80,486	)		—
Other, net		—		(4,176	)		—			366			—		(3,810	)		(1,716	)
Balance as of March 31, 2019
(17,459,961 shares of common stock issued; 3,012,224 in treasury)	$	17,460	$	3,608,654		$	(14,157	)	$	(1,393,059	)	$	6,017,589	$	8,236,487		$	175,721

See accompanying Notes to Unaudited Consolidated Financial Statements.

3

ALLEGHANY CORPORATION AND SUBSIDIARIES

Consolidated Statements of Cash Flows

(unaudited)

	Three Months Ended March 31,
	2020			2019
	($ in thousands)
Cash flows from operating activities
Net (losses) earnings	$	(361,472	)	$	447,902
Adjustments to reconcile net earnings to net cash provided by (used in)  operating activities:
Depreciation and amortization		33,158			27,732
Change in the fair value of equity securities		522,976			(392,353	)
Net realized capital (gains) losses		(13,026	)		(4,442	)
Credit losses for available for sale securities		31,375			10,020
(Increase) decrease in reinsurance recoverables, net of reinsurance payable		49,693			165,434
(Increase) decrease in premium balances receivable		(143,970	)		(103,538	)
(Increase) decrease in ceded unearned premiums		(18,020	)		(9,849	)
(Increase) decrease in deferred acquisition costs		(18,463	)		(23,537	)
(Increase) decrease in funds held under reinsurance agreements		(23,757	)		19,984
Increase (decrease) in unearned premiums		102,239			101,816
Increase (decrease) in loss and loss adjustment expenses		138,079			(395,170	)
Change in unrealized foreign currency exchange rate losses (gains)		80,530			1,070
Other, net		(386,627	)		88,546
Net adjustments		354,187			(514,287	)
Net cash provided by (used in) operating activities		(7,285	)		(66,385	)
Cash flows from investing activities
Purchases of debt securities		(1,993,449	)		(2,460,366	)
Purchases of equity securities		(331,453	)		(69,729	)
Sales of debt securities		1,960,691			987,132
Maturities and redemptions of debt securities		459,655			235,521
Sales of equity securities		602,627			1,510,222
Net (purchases) sales of short-term investments		378,854			(376,414	)
Net (purchases) sales and maturities of commercial mortgage loans		3,551			29
(Purchases) sales of property and equipment		(8,840	)		(12,956	)
Purchases of affiliates and subsidiaries, net of cash acquired		(26,383	)		1,157
Other, net		(152,416	)		73,423
Net cash provided by (used in) investing activities		892,837			(111,981	)
Cash flows from financing activities
Repayment of senior notes		(307,095	)		—
Treasury stock acquisitions		(44,268	)		(80,486	)
Increase (decrease) in other debt		62,659			8,178
Cash dividends paid		(215,013	)		—
Other, net		3,664			(11,421	)
Net cash provided by (used in) financing activities		(500,053	)		(83,729	)
Effect of foreign exchange rate changes on cash		(9,412	)		1,396
Net increase (decrease) in cash		376,087			(260,699	)
Cash at beginning of period		1,179,098			1,038,763
Cash at end of period	$	1,555,185		$	778,064
Supplemental disclosures of cash flow information
Cash paid during period for:
Interest paid	$	17,065		$	19,368
Income taxes paid (refund received)		24,604			(39,657	)

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, 2019 (the “2019 Form 10-K”) of Alleghany Corporation (“Alleghany”).

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

Although Alleghany’s primary sources of revenues and earnings are its reinsurance and insurance operations and investments, Alleghany also generates revenues and expenses from a diverse portfolio of middle market businesses that are owned and managed through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s businesses include:

• Precision Cutting Technologies, Inc. (“PCT”), a holding company headquartered in Rockford, Illinois, with four operating businesses: (i) Bourn & Koch, Inc., a provider of precision automated machine tool solutions; (ii) Diamond Technology Innovations, Inc., a manufacturer of waterjet orifices and nozzles and a provider of related services; (iii) Coastal Industrial Distributors, LLC, a provider of high-performance solid carbide end mills; and (iv) as of March 2020, Supermill LLC, a manufacturer of high-performance carbide end mills;

• 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 design, engineering, procurement, construction management and validation 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;

• CHECO Holdings, LLC (“Concord”), a hotel management and development company, headquartered in Raleigh, North Carolina; and

• as of March 31, 2020, 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. On April 1, 2020, Alleghany Capital acquired an additional approximately 55 percent of Wilbert it previously did not own, bringing its equity interest in Wilbert to approximately 100 percent, and as of that date, the results of Wilbert will be included in Alleghany’s consolidated results.

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

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

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

5

The portion of stockholders’ equity, net earnings and comprehensive income that is not attributable to Alleghany stockholders is presented on the consolidated balance sheets, the consolidated statements of earnings and comprehensive income and the consolidated statements of changes in stockholders’ equity 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 and the consolidated statements of changes in stockholders’ equity as redeemable noncontrolling interests for all periods presented. In addition, Alleghany accretes the redeemable noncontrolling interests up to their future estimated redemption value over the period from the date of issuance to the earliest redemption date. The redemption value of the equity interests is generally based on the subsidiary’s earnings in specified periods preceding the applicable redemption date, calculated based on either a specified formula or an independent fair market valuation. During the first three months of 2020, the noncontrolling interests outstanding were approximately as follows: Kentucky Trailer - 23 percent; IPS - 15 percent; Jazwares - 25 percent; W&W|AFCO Steel - 20 percent; and Concord - 15 percent. Prior to April 1, 2019, the noncontrolling interests of PCT were approximately 11 percent.  All noncontrolling interest holders of PCT have exercised their repurchase options and sold their ownership interests to PCT effective April 1, 2019.

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 and reported revenues and expenses 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 2019 Form 10-K.

(c) Recent Accounting Standards

Recently Adopted - 2019  

In February 2016, the Financial Accounting Standards Board (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 the prior guidance, a lessee was 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 remains largely unchanged. This guidance became effective in the first quarter of 2019 for public companies, with early adoption permitted. A modified retrospective transition approach was elected for all leases in existence as of, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Alleghany adopted this guidance in the first quarter of 2019 and the implementation did not have a material impact on its results of operations and financial condition. As part of its implementation, Alleghany elected to not separate lease components from non-lease components (such as office cleanings, security and maintenance services provided by Alleghany’s lessors for certain of its leases). Alleghany also elected the package of practical expedients under the transition guidance, which allowed Alleghany to not reevaluate existing lease classifications, among others. As of January 1, 2019, Alleghany’s adoption of this guidance resulted in recognition of an additional right-of-use asset of approximately $0.2 billion and a corresponding lease liability of $0.2 billion. See Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for further information on Alleghany’s leases.

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

Recently Adopted – 2020  

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, over the remaining expected life of such assets. Estimates of expected credit losses are to be based on historical experience, current conditions and reasonable and supportable forecasts. Under former FASB guidance, credit losses on these assets generally required a company to recognize credit losses when it was probable that a loss had been incurred. Credit losses for securities accounted for on an available for sale (“AFS”) basis are to be measured in a manner similar to GAAP as applied under former guidance and cannot exceed the amount by which the fair value is less than the amortized cost, although the new guidance removes the length of time a security has been in an unrealized loss position as a possible indication of a credit impairment. 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

6

well as the credit quality of financial assets. This guidance was effective in the first quarter of 2020 for public companies, with early adoption permitted. Alleghany adopted this guidance in the first quarter of 2020.

As of January 1, 2020, Alleghany increased its allowances for credit losses on certain financial assets accounted for at cost or amortized cost by $4.5 million and recorded an after-tax cumulative effect reduction in opening retained earnings of $3.6 million.  The increase in allowances for credit losses primarily relates to reinsurance recoverables and commercial mortgage loans. See Note 4 of this Form 10-Q for further information on Alleghany’s reinsurance recoverables and Note 3(i) of this Form 10-Q for further information on Alleghany’s investments in commercial mortgage loans.  The increase in allowances for credit losses also relates to premium balances receivable. Estimates of expected credit losses for all of these assets are based on certain market-based indicators of credit quality, which are updated on an annual basis and re-assessed at least quarterly. Related credit loss expenses are recorded as a component of other operating expenses.  

As of January 1, 2020, credit losses for Alleghany’s AFS securities are recorded through an allowance for credit losses on the consolidated balance sheets and as credit losses for AFS securities in the consolidated statements of earnings and comprehensive income.  See Note 3(f) of this Form 10-Q for further information on the credit quality for Alleghany’s AFS securities.

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 was effective in the first quarter of 2020 for public companies, with early adoption permitted. Alleghany adopted this guidance in the first quarter of 2020 and the implementation did not have a material impact on its results of operations and financial condition. See Note 2 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for further information on Alleghany’s goodwill.

In August 2018, the FASB issued guidance that changes the financial statement disclosure requirements for measuring fair value. With respect to financial instruments classified as “Level 3” in the fair value disclosure hierarchy, the guidance requires certain additional disclosures for public companies related to amounts included in other comprehensive income and significant unobservable inputs used in the valuation, while removing disclosure requirements related to an entity’s overall valuation processes. The guidance also removes certain disclosure requirements related to transfers between financial instruments classified as “Level 1” and “Level 2” and provides clarification on certain other existing disclosure requirements. This guidance was effective for interim and annual periods beginning after December 15, 2019, with early adoption permitted with respect to any eliminated or modified disclosures. Alleghany adopted this guidance in the first quarter of 2020 and the implementation did not impact its results of operations or financial condition. See Note 2 of this Form 10-Q for further information on the fair value of Alleghany’s financial instruments.

In March 2020, the FASB issued guidance to expedite and simplify the accounting associated with the anticipated migration away from the widely-used London Inter-bank Offered Rate and other similar rates as benchmark interest rates after 2021.  Under pre-existing GAAP, such modifications made to: (i) loans and certain other contracts would require re-assessments of the accounting for those contacts, such as whether they were extinguished and remeasured from an accounting perspective; and (ii) derivative contracts may cause a change in accounting, such as a possible dedesignation of hedge accounting. This new guidance largely eliminates these requirements as a result of this migration to one or more new benchmark rates and is generally applicable for contract modifications made prior to December 31, 2022. Alleghany adopted this guidance in March 2020 and the implementation did not have an impact on its results of operations and financial condition.

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 March 31, 2020 and December 31, 2019:

	March 31, 2020				December 31, 2019
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	15,584.6	$	15,584.6	$	17,632.3	$	17,632.3
Liabilities
Senior notes and other debt(2)	$	1,514.4	$	1,674.8	$	1,751.1	$	1,962.7

(1) This table includes debt and equity securities, as well as partnership and non-marketable equity investments accounted for 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 accounted for at unpaid principal balance. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is disclosed below.

(2) See Note 11 of this Form 10-Q for additional information on the senior notes and other debt.

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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 March 31, 2020 and December 31, 2019:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of March 31, 2020
Equity securities:
Common stock	$	1,702.6	$	3.5	$	—	$	1,706.1
Preferred stock		—		2.1		2.0		4.1
Total equity securities		1,702.6		5.6		2.0		1,710.2
Debt securities:
U.S. Government obligations		—		846.3		—		846.3
Municipal bonds		—		2,272.6		—		2,272.6
Foreign government obligations		—		696.0		—		696.0
U.S. corporate bonds		—		2,805.2		589.5		3,394.7
Foreign corporate bonds		—		1,125.9		164.7		1,290.6
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		—		1,697.4		2.5		1,699.9
Commercial mortgage-backed securities (“CMBS”)		—		838.1		4.5		842.6
Other asset-backed securities(2)		—		1,548.4		746.7		2,295.1
Total debt securities(3)		—		11,829.9		1,507.9		13,337.8
Short-term investments		—		536.1		—		536.1
Other invested assets(4)		—		—		0.5		0.5
Total investments (excluding equity method investments and loans)	$	1,702.6	$	12,371.6	$	1,510.4	$	15,584.6
Senior notes and other debt	$	—	$	1,245.0	$	429.8	$	1,674.8

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2019
Equity securities:
Common stock	$	2,498.1	$	3.3	$	—	$	2,501.4
Preferred stock		—		2.1		2.0		4.1
Total equity securities		2,498.1		5.4		2.0		2,505.5
Debt securities:
U.S. Government obligations		—		1,215.0		—		1,215.0
Municipal bonds		—		2,307.9		—		2,307.9
Foreign government obligations		—		690.7		—		690.7
U.S. corporate bonds		—		2,754.0		605.0		3,359.0
Foreign corporate bonds		—		1,208.7		168.7		1,377.4
Mortgage and asset-backed securities:
RMBS(1)		—		1,838.5		1.9		1,840.4
CMBS		—		865.9		5.8		871.7
Other asset-backed securities(2)		—		1,692.9		856.7		2,549.6
Total debt securities		—		12,573.6		1,638.1		14,211.7
Short-term investments		—		914.8		—		914.8
Other invested assets(4)		—		—		0.3		0.3
Total investments (excluding equity method investments and loans)	$	2,498.1	$	13,493.8	$	1,640.4	$	17,632.3
Senior notes and other debt	$	—	$	1,595.6	$	367.1	$	1,962.7

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

(2) Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

(3) Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

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

8

In the three months ended March 31, 2020, Alleghany transferred out of Level 3 $14.7 million of financial instruments, principally due to an increase in observable inputs related to the valuation of such assets. Specifically, during the first three months of 2020, there was a decrease in the weight given to non-binding broker quotes and, as a result, there was a corresponding increase in quoted prices for similar assets in active markets. Of the $14.7 million of transfers, $11.4 million related to other asset-backed securities, with the remainder related to foreign corporate bonds.

In the three months ended March 31, 2019, Alleghany transferred into Level 3 $14.7 million of foreign corporate bonds, principally due to a decrease in observable inputs related to the valuation of such assets.  Specifically, during the first three months of 2019, there was an increase in the weight given to non-binding broker quotes and, as a result, there was a corresponding decrease in quoted prices for similar assets in active markets.

In the three months ended March 31, 2019, Alleghany transferred out of Level 3 $1.0 million of U.S. corporate bonds, principally due to an increase in observable inputs related to the valuation of such assets. Specifically, during the first three months of 2019, there was a decrease in the weight given to non-binding broker quotes, and as a result, there was a corresponding increase in quoted prices for similar assets in active markets.

The following tables present reconciliations of the changes in Level 3 assets during the three months ended March 31, 2020 and 2019 measured at fair value:

			Debt Securities
									Mortgage and asset-backed
Three Months Ended March 31, 2020	Preferred Stock		U.S. Corporate Bonds			Foreign Corporate Bonds			RMBS			CMBS			Other Asset- backed Securities			Other Invested Assets(1)		Total
	($ in millions)
Balance as of January 1, 2020	$	2.0	$	605.0		$	168.7		$	1.9		$	5.8		$	856.7		$	0.3	$	1,640.4
Net realized/unrealized gains (losses) included in:
Net earnings (losses)(2)		—		0.2			—			—			—			(0.1	)		—		0.1
Other comprehensive income (loss)		—		(18.8	)		(7.3	)		(0.2	)		(1.3	)		(101.4	)		0.2		(128.8	)
Purchases		—		6.7			7.7			0.9			—			43.6			—		58.9
Sales		—		—			—			—			—			(8.3	)		—		(8.3	)
Issuances		—		—			—			—			—			—			—		—
Settlements		—		(3.6	)		(1.1	)		(0.1	)		—			(32.4	)		—		(37.2	)
Transfers into Level 3		—		—			—			—			—			—			—		—
Transfers out of Level 3		—		—			(3.3	)		—			—			(11.4	)		—		(14.7	)
Balance as of March 31, 2020	$	2.0	$	589.5		$	164.7		$	2.5		$	4.5		$	746.7		$	0.5	$	1,510.4

				Debt Securities
										Mortgage and asset-backed
Three Months Ended March 31, 2019	Preferred Stock			U.S. Corporate Bonds			Foreign Corporate Bonds			CMBS		Other Asset- backed Securities			Other Invested Assets(1)			Total
	($ in millions)
Balance as of January 1, 2019	$	5.4		$	425.7		$	126.9		$	—	$	1,266.9		$	0.7		$	1,825.6
Net realized/unrealized gains (losses) included in:
Net (losses)(2)		—			(9.9	)		—			—		—			—			(9.9	)
Other comprehensive income (loss)		(0.8	)		15.7			2.6			—		15.2			(0.2	)		32.5
Purchases		—			5.8			13.8			0.2		49.6			—			69.4
Sales		—			—			(5.6	)		—		(116.9	)		—			(122.5	)
Issuances		—			—			—			—		—			—			—
Settlements		—			(2.6	)		(1.0	)		—		(35.8	)		—			(39.4	)
Transfers into Level 3		—			—			14.7			—		—			—			14.7
Transfers out of Level 3		—			(1.0	)		—			—		—			—			(1.0	)
Balance as of March 31, 2019	$	4.6		$	433.7		$	151.4		$	0.2	$	1,179.0		$	0.5		$	1,769.4

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

(2) There were no credit losses recorded in net earnings related to Level 3 assets still held as of March 31, 2020 and 2019.

9

The increase in senior notes and other debt included in Level 3 for the first three months of 2020 primarily reflects increased borrowings at Jazwares due to an increase in working capital needs.

Although Alleghany is responsible for the determination of the fair value of Alleghany’s financial assets and the supporting methodologies and assumptions, it employs 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 valuation models. As of March 31, 2020 and December 31, 2019, the fair value for the vast majority of debt securities included in Level 3 was provided by such third-party valuation service providers, and as such, valuation details on these securities are generally not available to Alleghany.

Alleghany employs specific control processes to determine the reasonableness of the fair values of its financial assets and liabilities. Alleghany’s 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. Alleghany assesses the reasonableness of individual security values received from valuation service providers through various analytical techniques. In addition, Alleghany validates the reasonableness of fair values by comparing information obtained from Alleghany’s valuation service providers to other third-party valuation sources for selected securities. Alleghany also validates 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. See Note 1(c) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for Alleghany’s accounting policy on fair value.

3. Investments

(a) Unrealized Gains and Losses

The following tables present the amortized cost and the fair value of AFS securities as of March 31, 2020 and December 31, 2019:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Allowance for Credit Losses(2)			Fair Value
	($ in millions)
As of March 31, 2020
Debt securities:
U.S. Government obligations	$	793.5	$	53.0	$	(0.2	)	$	—		$	846.3
Municipal bonds		2,158.3		117.2		(2.9	)		—			2,272.6
Foreign government obligations		669.1		27.6		(0.7	)		—			696.0
U.S. corporate bonds		3,386.8		103.5		(69.1	)		(26.5	)		3,394.7
Foreign corporate bonds		1,311.2		14.5		(32.7	)		(2.4	)		1,290.6
Mortgage and asset-backed securities:
RMBS		1,613.7		86.9		(0.2	)		(0.5	)		1,699.9
CMBS		870.6		15.9		(43.9	)		—			842.6
Other asset-backed securities(1)		2,517.6		5.6		(226.1	)		(2.0	)		2,295.1
Total debt securities		13,320.8		424.2		(375.8	)		(31.4	)		13,337.8
Short-term investments		536.1		—		—			—			536.1
Total investments	$	13,856.9	$	424.2	$	(375.8	)	$	(31.4	)	$	13,873.9

10

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in millions)
As of December 31, 2019
Debt securities:
U.S. Government obligations	$	1,198.5	$	19.3	$	(2.8	)	$	1,215.0
Municipal bonds		2,190.5		118.7		(1.3	)		2,307.9
Foreign government obligations		675.9		16.4		(1.6	)		690.7
U.S. corporate bonds		3,206.2		155.1		(2.3	)		3,359.0
Foreign corporate bonds		1,348.1		32.2		(2.9	)		1,377.4
Mortgage and asset-backed securities:
RMBS		1,785.1		56.1		(0.8	)		1,840.4
CMBS		849.9		23.2		(1.4	)		871.7
Other asset-backed securities(1)		2,544.5		24.8		(19.7	)		2,549.6
Total debt securities		13,798.7		445.8		(32.8	)		14,211.7
Short-term investments		914.8		—		—			914.8
Total investments	$	14,713.5	$	445.8	$	(32.8	)	$	15,126.5

(1) Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

(2) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

(b) Contractual Maturity

The following table presents the amortized cost and estimated fair value of debt securities by contractual maturity as of March 31, 2020. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	($ in millions)
As of March 31, 2020
Short-term investments due in one year or less	$	536.1	$	536.1
Mortgage and asset-backed securities(1)		5,001.9		4,837.6
Debt securities with maturity dates:
One year or less		432.8		432.3
Over one through five years		3,174.0		3,201.3
Over five through ten years		2,728.0		2,770.8
Over ten years		1,984.1		2,095.8
Total debt securities	$	13,320.8	$	13,337.8

(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 months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Interest income	$	119.3		$	119.2
Dividend income		10.1			9.8
Investment expenses		(7.1	)		(7.5	)
Partnerships and other investment results		(10.3	)		1.5
Total	$	112.0		$	123.0

As of March 31, 2020, non-income producing invested assets were immaterial.

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(d) Change in the Fair Value of Equity Securities

The following table presents changes in the fair value of equity securities for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Change in the fair value of equity securities sold during the period	$	(164.9	)	$	62.1
Change in the fair value of equity securities held at the end of the period		(358.1	)		330.3
Change in the fair value of equity securities	$	(523.0	)	$	392.4

(e) Realized Gains and Losses

The proceeds from sales of debt and equity securities were $2.6 billion and $2.5 billion for the three months ended March 31, 2020 and 2019, respectively.

Realized capital gains and losses for the three months ended March 31, 2020 and 2019 primarily reflect the sale of debt securities and, for the three months ended March 31, 2020, a $30.0 million impairment charge from a write-down of certain SORC assets arising from a significant decline in energy prices as of March 31, 2020. Realized capital gains and losses for the three months ended March 31, 2020 also include a $5.0 million realized gain from a reduction of certain contingent consideration liabilities at the PCT-level in connection with its acquisition of a provider of high-performance solid carbide end mills in June 2019, and a $7.1 million realized loss as a result of an early redemption of debt (see Note 11(a) of this Form 10-Q for further information on this early redemption).

The following table presents amounts of gross realized capital gains and gross realized capital losses for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Gross realized capital gains	$	59.0		$	12.1
Gross realized capital losses		(46.0	)		(7.7	)
Net realized capital gains	$	13.0		$	4.4

Gross realized capital losses exclude credit losses for AFS securities, as discussed below.

(f) Credit quality for AFS securities

Alleghany holds its debt securities as AFS and, as such, these securities are recorded at fair value. Credit losses for AFS securities are recorded through an allowance for credit losses. Changes in the allowance for credit losses are recorded for (or as a reversal of) credit losses for AFS securities.  Any portion of a decline in fair value 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.

Alleghany continually monitors the difference between amortized cost and the estimated fair value of its debt investments. The analysis of a security’s decline in value is performed in its functional currency.  Debt securities in an unrealized loss position are evaluated for credit losses if they meet any of the following criteria: (i) they are trading at a discount of at least 20 percent to amortized cost and have a credit rating below investment grade or are not rated; (ii) there has been a negative credit or news event with respect to the issuer that could indicate the existence of a credit loss; 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 a credit 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 a credit 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 total 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

12

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.

Credit losses for AFS securities in the first three months of 2020 reflect $31.4 million of unrealized losses on debt securities, primarily related to the energy sector and lower-quality corporate bonds in other sectors due to a significant decline in their fair value relative to their amortized costs.

Credit losses for AFS securities in the first three months of 2019 reflect $10.0 million of unrealized losses on debt securities, primarily related to the energy sector and the deterioration of creditworthiness of the issuers.

The following table presents a rollforward of Alleghany’s allowance for credit losses for AFS securities for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		—
Provision for credit losses		31.4
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	31.4

(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

The gross unrealized investment losses for debt securities as of March 31, 2020 were deemed to be temporary, based on, among other factors: (i) the relative magnitude to which the fair value of these investments had been below cost were not indicative of a credit 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’s methodology for assessing credit losses 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.

13

Alleghany’s consolidated investment portfolio 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 three large, reputable rating agencies. In this regard, the overall weighted-average credit quality rating of Alleghany’s debt securities portfolio as of March 31, 2020 and December 31, 2019, was AA-. Although a portion of Alleghany’s debt securities, which consist predominantly of municipal bonds, is 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 March 31, 2020. The following table presents the ratings of Alleghany’s debt securities as of March 31, 2020:

	Ratings as of March 31, 2020
	AAA / Aaa			AA / Aa			A			BBB / Baa			Below BBB / Baa or Not Rated(1)			Total
	($ in millions)
U.S. Government obligations	$	—		$	846.3		$	—		$	—		$	—		$	846.3
Municipal bonds		184.2			1,526.5			489.4			71.6			0.9			2,272.6
Foreign government obligations		445.4			153.8			95.8			1.0			—			696.0
U.S. corporate bonds		9.0			158.0			1,586.4			1,298.2			343.1			3,394.7
Foreign corporate bonds		225.2			95.9			607.4			325.9			36.2			1,290.6
Mortgage and asset-backed securities:
RMBS		2.5			1,692.3			—			1.0			4.1			1,699.9
CMBS		283.6			400.8			157.8			0.4			—			842.6
Other asset-backed securities		961.8			513.6			457.9			274.6			87.2			2,295.1
Total debt securities	$	2,111.7		$	5,387.2		$	3,394.7		$	1,972.7		$	471.5		$	13,337.8
Percentage of debt securities, before allowance for credit losses		15.8	%		40.4	%		25.5	%		14.8	%		3.5	%		100.0	%

(1) Consists of $109.3 million of securities rated BB / Ba, $187.5 million of securities rated B, $26.2 million of securities rated CCC, $0.4 million of securities rated CC, $2.1 million of securities rated below CC and $146.0 million of not rated securities.

(g) Aging of Gross Unrealized Losses

The following tables present gross unrealized losses and related fair values for Alleghany’s AFS securities for which an allowance for credit losses has not been recorded, grouped by duration of time in a continuous unrealized loss position, as of March 31, 2020 and December 31, 2019:

	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 March 31, 2020
Debt securities:
U.S. Government obligations	$	8.7	$	0.2	$	—	$	—	$	8.7	$	0.2
Municipal bonds		129.4		2.9		0.1		—		129.5		2.9
Foreign government obligations		76.5		0.7		—		—		76.5		0.7
U.S. corporate bonds		1,023.5		68.5		3.6		0.6		1,027.1		69.1
Foreign corporate bonds		656.5		32.6		17.4		0.1		673.9		32.7
Mortgage and asset-backed securities:
RMBS		15.2		0.2		0.4		—		15.6		0.2
CMBS		436.4		43.9		0.2		—		436.6		43.9
Other asset-backed securities		1,529.0		139.5		491.3		86.6		2,020.3		226.1
Total temporarily impaired securities	$	3,875.2	$	288.5	$	513.0	$	87.3	$	4,388.2	$	375.8

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	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	($ in millions)
As of December 31, 2019
Debt securities:
U.S. Government obligations	$	120.3	$	2.0	$	99.7	$	0.8	$	220.0	$	2.8
Municipal bonds		90.2		1.3		4.3		—		94.5		1.3
Foreign government obligations		198.5		1.2		33.8		0.4		232.3		1.6
U.S. corporate bonds		113.8		1.6		27.6		0.7		141.4		2.3
Foreign corporate bonds		212.0		2.3		66.9		0.6		278.9		2.9
Mortgage and asset-backed securities:
RMBS		48.7		0.3		48.6		0.5		97.3		0.8
CMBS		126.8		1.4		1.2		—		128.0		1.4
Other asset-backed securities		422.9		2.7		715.9		17.0		1,138.8		19.7
Total temporarily impaired securities	$	1,333.2	$	12.8	$	998.0	$	20.0	$	2,331.2	$	32.8

As of March 31, 2020, Alleghany held a total of 1,672 debt securities that were in an unrealized loss position, of which 126 securities were in an unrealized loss position continuously for 12 months or more. The unrealized losses associated with these debt securities consisted of losses related primarily to other asset-backed securities, U.S. corporate bonds and CMBS.  

(h) Investments in Variable Interest Entities

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 March 31, 2020, Alleghany’s carrying value in the Pillar Investments, as determined under the equity method of accounting, was $194.7 million, which is reported as a component of other invested assets and is net of returns of capital received from the Pillar Investments.

(i) Investments in Commercial Mortgage Loans

As of March 31, 2020, the carrying value of Alleghany’s commercial mortgage loan portfolio was $682.7 million, representing the unpaid principal balance on the loans, less allowance for credit losses. The estimated fair value of the commercial mortgage loan portfolio approximated carrying value as of March 31, 2020 and December 31, 2019. 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, and mature in two to ten years from loan origination. As of March 31, 2020, the vast majority of loans in Alleghany’s portfolio were originated in the 2016 through 2019 years.

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 and the estimated fair value of underlying collateral was approximately double that of the commercial mortgage loan portfolio carrying value as of March 31, 2020.  Fair value estimates of underlying collateral are updated on a rolling basis annually, with a portion of the portfolio updated each quarter. As of March 31, 2020, there was no loan in default or in arrears.

The following table presents a rollforward of Alleghany’s allowance for credit losses on commercial mortgage loans for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		0.8
Provision for credit losses(2)		1.2
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	2.0

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(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

(2) Primarily reflects an increase in the estimate of expected credit losses based on current conditions and reasonable and supportable forecasts as of March 31, 2020 arising from the Pandemic, as defined in Note 9(a) of this Form 10-Q.

4. Reinsurance Ceded

(a) Overview

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 generally purchase reinsurance and retrocessional coverages from highly- rated third-party reinsurers or on a collateralized basis. 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. A summary of the more significant programs follows.

TransRe enters into various retrocession arrangements, including property catastrophe retrocession contracts, to manage the effects of individual or aggregate exposure to losses, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns, strengthen its market position and enhance capital efficiency. These include excess-of-loss and quota share treaties in traditional rated form as well as catastrophe bonds and other collateralized insurance-linked structures. TransRe’s retrocession protections generally have a one-year term and renewal dates occur throughout the year, with the majority renewing at January 1 and June 1. The catastrophe bonds, however, have a four-year term, with maturities in 2022 and 2023.

RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, and per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program and property per risk reinsurance program each run on an annual basis from May 1 to the following April 30 and portions expired on April 30, 2020. Both programs were renewed on May 1, 2020 with substantially similar terms as the expired programs.

(b) Reinsurance Recoverables

Amounts recoverable from reinsurers are recognized in a manner consistent with the loss and loss adjustment expense (“LAE”) liabilities associated with the reinsurance placement and presented on the balance sheet as reinsurance recoverables, and are recorded after an allowance for credit losses. Reinsurance recoverable balances as of March 31, 2020 and December 31, 2019 are presented in the table below:

	As of March 31,			As of December 31,
	2020			2019
	($ in millions)
Reinsurance recoverables on paid losses	$	75.9		$	98.1
Ceded outstanding loss and LAE		1,559.5			1,583.9
Reinsurance recoverables, before allowance for credit losses		1,635.4			1,682.0
Allowance for credit losses		(6.8	)		—
Total	$	1,628.6		$	1,682.0

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The following table presents information regarding concentration of Alleghany’s reinsurance recoverables and the ratings profile of our reinsurers as of March 31, 2020:

Reinsurer(1)	Rating(2)	Amount			Percentage
	($ in millions)
Syndicates at Lloyd's of London	A (Excellent)	$	132.9			8.1	%
Kane SAC Ltd, Rondout Segregated Account(3)	not rated		121.8			7.4	%
PartnerRe Ltd	A (Excellent)		97.4			6.0	%
Fairfax Financial Holdings Ltd	A (Superior)		90.4			5.5	%
Swiss Reinsurance Company	A+ (Superior)		88.1			5.4	%
Third Point Reinsurance Group	A- (Excellent)		87.0			5.3	%
Kane SAC Ltd, Bowery Segregated Account(3)	not rated		77.4			4.7	%
RenaissanceRe Holdings Ltd	A+ (Superior)		75.4			4.6	%
W.R. Berkley Corporation	A+ (Superior)		67.7			4.1	%
Liberty Mutual	A (Excellent)		55.9			3.4	%
All other reinsurers			741.4			45.5	%
Total reinsurance recoverables, before allowance for credit losses(4)		$	1,635.4			100.0	%
Allowance for credit losses			(6.8	)
Total		$	1,628.6
Secured reinsurance recoverables(3)		$	659.6			40.3	%

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

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

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

(4) Approximately 66 percent of our reinsurance recoverables balance as of March 31, 2020 was due from reinsurers having an A.M. Best Company, Inc. financial strength rating of A (Excellent) or higher, with a majority of the other reinsurance recoverables being secured by funds held, trust agreements or letters of credit.

The following table presents a rollforward of Alleghany’s allowance for credit losses on reinsurance recoverables for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		3.3
Provision for credit losses(2)		3.5
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	6.8

(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

(2) Primarily reflects an increase in the estimate of expected credit losses based on current conditions and reasonable and supportable forecasts as of March 31, 2020 arising from the Pandemic, as defined in Note 9(a) of this Form 10-Q.

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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 for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Reserves as of January 1	$	11,928.4		$	12,250.3
Less: reinsurance recoverables(1)		1,583.9			1,857.4
Net reserves as of January 1		10,344.5			10,392.9
Other adjustments		—			(0.2	)
Incurred loss and LAE, net of reinsurance, related to:
Current year		1,086.4			829.9
Prior years		(59.0	)		(37.4	)
Total incurred loss and LAE, net of reinsurance		1,027.4			792.5
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		87.3			75.3
Prior years		770.2			914.8
Total paid loss and LAE, net of reinsurance		857.5			990.1
Foreign currency exchange rate effect		(7.5	)		17.2
Net reserves as of March 31		10,506.9			10,212.3
Reinsurance recoverables as of March 31(1)		1,559.5			1,642.8
Reserves as of March 31	$	12,066.4		$	11,855.1

(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 as of March 31, 2020 increased from December 31, 2019, primarily reflecting the impact of growing net premiums earned and catastrophe losses incurred in the first three months of 2020, partially offset by payments on catastrophe losses incurred in 2017, 2018 and 2019 and favorable prior accident year loss reserve development.  

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(b) Liability Development

The following table presents the (favorable) unfavorable prior accident year loss reserve development for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020				2019
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	(32.3	)	(1)	$	8.4		(2)
Non-catastrophe		(14.4	)	(3)		(19.1	)	(4)
Total		(46.7	)			(10.7	)
Casualty & other:
Malpractice Treaties(5)		—				—
Other		(11.0	)	(6)		(25.7	)	(7)
Total		(11.0	)			(25.7	)
Total Reinsurance Segment		(57.7	)			(36.4	)
Insurance Segment
RSUI:
Casualty		(1.0	)	(8)		(5.6	)	(9)
Property and other		(0.5	)	(10)		1.9		(11)
Total		(1.5	)			(3.7	)
CapSpecialty		0.2		(12)		2.7		(12)
Total incurred related to prior years	$	(59.0	)		$	(37.4	)

(1) Primarily reflects favorable prior accident year loss reserve development related to Typhoon Hagibis in the 2019 accident year and catastrophes in the 2018 accident year.

(2) Primarily reflects unfavorable prior accident year loss reserve development related to Typhoon Jebi in the 2018 accident year, partially offset by favorable prior accident year loss reserve development related to the wildfires in California in the 2018 accident year.

(3) Primarily reflects favorable prior accident year loss reserve development in the 2017 and 2019 accident years.

(4) Primarily reflects favorable prior accident year loss reserve development in the 2016 through 2018 accident years.

(5) Represents certain 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) Primarily reflects favorable prior accident year loss reserve development in the longer-tailed lines of business in the 2013 and earlier accident years, partially offset by unfavorable prior accident year development in the shorter-tailed lines of business in the 2014 through 2019 accident years.

(7) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed lines of business in the 2012 through 2017 prior accident years and in the professional liability lines of business in the 2007 and prior accident years.

(8) Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in recent accident years.

(9) Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in the 2017 accident year.

(10) Primarily reflects favorable prior accident year loss reserve development related to catastrophes in the 2018 accident year, partially offset by unfavorable prior accident year loss reserve development related to catastrophes in the 2017 accident year.

(11) Primarily reflects unfavorable prior accident year loss reserve development related to Hurricanes Harvey in the 2017 accident year and Florence in the 2018 accident year.

(12) Primarily reflects unfavorable prior accident year loss reserve development in certain specialty lines of business written through a program administrator in connection with a terminated program in the 2009 and 2010 accident years.

6. Income Taxes

The Coronavirus Aid, Relief and Economic Security Act (the "CARES Act") was signed into law on March 27, 2020.  Among other provisions, the CARES Act delayed certain employer payroll tax remittance deadlines and created or expanded certain income tax credits and loss carryback provisions and, as a result, Alleghany recorded a $6.9 million tax benefit as of March 31, 2020.

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The effective tax rate on earnings before income taxes for the first three months of 2020 was 22.4  percent compared with 19.5 percent for the first three months of 2019. The effective tax rate in the first three months of 2020 was calculated based on actual results through March 31, 2020 because management was not able to reliably estimate the annual effective tax rate in light of the significant losses incurred.  The increase in the effective tax rate in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of the CARES Act.

Alleghany believes that, as of March 31, 2020, it had no material uncertain tax positions. Interest and penalties related to unrecognized tax expenses (benefits) are recognized in income tax expense, when applicable. There were no material liabilities for interest or penalties accrued as of March 31, 2020.

7. Stockholders’ Equity

(a) Common Stock Repurchases

In June 2018, the Alleghany Board of Directors authorized the repurchase of shares of common stock of Alleghany, par value $1.00 per share (“Common Stock”), at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million. In September 2019, the Alleghany Board of Directors authorized, upon the completion of the program authorized in 2018, the repurchase of additional shares of Common Stock, at such times and at prices as management determines to be advisable, up to an aggregate of $500.0 million.  As of March 31, 2020, Alleghany had $582.9 million remaining under its share repurchase authorizations.

The following table presents the shares of Common Stock that Alleghany repurchased in the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020		2019
Shares repurchased		62,540		129,567
Cost of shares repurchased (in millions)	$	44.3	$	80.5
Average price per share repurchased	$	707.84	$	621.19

(b) Accumulated Other Comprehensive Income (Loss)

The following tables present a reconciliation of the changes during the three months ended March 31, 2020 and 2019 in accumulated other comprehensive income (loss) attributable to Alleghany stockholders:

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2020	$	321.0		$	(121.8	)	$	(27.9	)	$	171.3
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		(276.6	)		(13.7	)		0.5			(289.8	)
Reclassifications from accumulated other comprehensive income		(10.9	)		—			—			(10.9	)
Total		(287.5	)		(13.7	)		0.5			(300.7	)
Balance as of March 31, 2020	$	33.5		$	(135.5	)	$	(27.4	)	$	(129.4	)

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2019	$	(61.6	)	$	(124.7	)	$	(15.7	)	$	(202.0	)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		183.4			(0.9	)		0.9			183.4
Reclassifications from accumulated other comprehensive income		4.4			—			—			4.4
Total		187.8			(0.9	)		0.9			187.8
Balance as of March 31, 2019	$	126.2		$	(125.6	)	$	(14.8	)	$	(14.2	)

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The following table presents reclassifications out of accumulated other comprehensive income (loss) attributable to Alleghany stockholders during the three months ended March 31, 2020 and 2019:

Accumulated Other		Three Months Ended March 31,
Comprehensive Income Component	Line in Consolidated Statement of Earnings	2020			2019
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(45.1	)	$	(4.4	)
	Credit losses for available for sale securities		31.4			10.0
	Income taxes		2.8			(1.2	)
Total reclassifications:	Net (earnings) losses	$	(10.9	)	$	4.4

(1) For the three months ended March 31, 2020, excludes a $7.1 million realized loss as a result of an early redemption of debt (see Note 11(a) of this Form 10-Q for further information), a $30.0 million impairment charge from a write-down of certain SORC assets and a $5.0 million realized gain from a reduction of certain contingent consideration liabilities (see Note 3(e) of this Form 10-Q for additional information).

(c) Special Dividend

In February 2020, the Alleghany Board of Directors declared a special dividend of $15.00 per share for stockholders of record on March 5, 2020. On March 15, 2020, Alleghany paid dividends to stockholders totaling $215.0 million.

8. Earnings Per Share of Common Stock

The following table presents a reconciliation of the earnings and share data used in the basic and diluted earnings per share computations for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions, except share amounts)
Net earnings available to Alleghany stockholders	$	(361.2	)	$	440.2
Effect of dilutive securities		(3.0	)		—
Income available to common stockholders for diluted earnings per share	$	(364.2	)	$	440.2
Weighted average common shares outstanding applicable to basic earnings per share		14,340,669			14,481,255
Effect of dilutive securities		15,439			3,981
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		14,356,108			14,485,236
Contingently issuable shares(1)		18,703			39,325

(1) Contingently issuable shares were potentially available in the periods presented, but were not included in the diluted earnings per share computations because the impact was anti-dilutive to the earnings per share calculation.

9. Commitments and Contingencies

(a) General

The ongoing COVID-19 global pandemic (the “Pandemic”) has significantly disrupted many aspects of society as well as financial markets, and has caused widespread global economic dislocation. Alleghany cannot reasonably estimate the duration or severity of the Pandemic, or the extent to which the related disruption may adversely impact its results of operations, financial position and cash flows, or those of its subsidiaries. Adverse impacts from the Pandemic in future periods may include realized and unrealized losses in Alleghany’s investment portfolio and receivables, as well as impairment losses on certain subsidiary goodwill and intangible assets.

Certain of Alleghany’s subsidiaries are parties to pending litigation and claims in connection with the ordinary course of their businesses. Each such subsidiary makes provisions for estimated losses to be incurred in such litigation and claims, including legal costs. In the opinion of management, such provisions are adequate, and management does not believe that any pending litigation will have a material adverse effect on Alleghany’s consolidated results of operations, financial position or cash flows.

(b) Leases

Alleghany and its subsidiaries lease certain facilities, land, furniture and equipment under long-term, non-cancelable lease agreements that expire at various dates in future years. Most of Alleghany’s leases relate to office facilities. Alleghany’s lease agreements do not contain any material restrictive covenants and substantially all are considered to be operating leases. 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 2019 Form 10-K.

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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 businesses into three reportable segments – reinsurance, insurance and Alleghany Capital.

Reinsurance and insurance underwriting activities are evaluated separately from investment and other activities. Segment accounting policies are described in Note 1 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 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 other reinsurers through brokers and on a direct basis to ceding companies. TransRe writes a modest amount of property and casualty insurance business, which is included in the reinsurance segment. A significant portion of the premiums earned by TransRe’s operations are generated by offices located in Canada, Europe, Asia, Australia, Africa and those serving Latin America and the Caribbean. Although the majority of the premiums earned by these offices typically relate to the regions where they are located, a significant portion may be derived from other regions of the world, including the U.S. In addition, although a significant portion of the assets and liabilities of these foreign offices generally relate to the countries where the 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 and CapSpecialty. RSUI also writes a modest amount of assumed reinsurance business, which is included in the insurance segment.

The Alleghany Capital segment consists of industrial operations, non-industrial operations and corporate operations at the Alleghany Capital level. Industrial operations are conducted through PCT, Kentucky Trailer, W&W|AFCO Steel and, through March 31, 2020, a 45 percent equity interest in Wilbert. Non-industrial operations are conducted through IPS, Jazwares and Concord.

Corporate activities are not classified as a segment. The primary components of corporate activities are Alleghany Properties, SORC and activities at the Alleghany parent company. Corporate activities also include the elimination of minor activity between segments.

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 11 of this Form 10-Q.

(b) Results

The following tables present segment results for Alleghany’s three reportable segments and for corporate activities for the three months ended March 31, 2020 and 2019:

		Reinsurance Segment									Insurance Segment
Three Months Ended March 31, 2020		Property			Casualty & other (1)			Total			RSUI		Cap Specialty			Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities			Consolidated
	($ in millions)
Gross premiums written		$	412.6		$	914.9		$	1,327.5		$	365.9	$	85.5		$	451.4	$	1,778.9		$	—	$	1,778.9		$	(8.3	)	$	1,770.6
Net premiums written			312.9			898.1			1,211.0			244.5		78.2			322.7		1,533.7			—		1,533.7			—			1,533.7
Net premiums earned			321.4			811.7			1,133.1			229.4		81.9			311.3		1,444.4			—		1,444.4			—			1,444.4
Net loss and LAE			247.9			614.3			862.2			116.0		49.2			165.2		1,027.4			—		1,027.4			—			1,027.4
Commissions, brokerage and other    underwriting expenses			105.4			244.4			349.8			57.8		33.8			91.6		441.4			—		441.4			—			441.4
Underwriting (loss) profit(2)		$	(31.9	)	$	(47.0	)	$	(78.9	)	$	55.6	$	(1.1	)	$	54.5		(24.4	)		—		(24.4	)		—			(24.4	)
Net investment income																			109.7			1.8		111.5			0.5			112.0
Change in the fair value of equity securities																			(521.6	)		—		(521.6	)		(1.4	)		(523.0	)
Net realized capital gains																			45.1			4.9		50.0			(37.0	)		13.0
Credit losses for available for sale securities																			(30.7	)		—		(30.7	)		(0.7	)		(31.4	)
Noninsurance revenue																			7.4			457.3		464.7			3.2			467.9
Other operating expenses																			9.9			450.7		460.6			6.1			466.7
Corporate administration																			(2.0	)		—		(2.0	)		(12.3	)		(14.3	)
Amortization of intangible assets																			0.4			9.2		9.6			—			9.6
Interest expense																			6.7			3.8		10.5			7.8			18.3
Earnings (losses) before income taxes																		$	(429.5	)	$	0.3	$	(429.2	)	$	(37.0	)	$	(466.2	)

22

		Reinsurance Segment							Insurance Segment
Three Months Ended March 31, 2019		Property		Casualty & other (1)			Total		RSUI		Cap Specialty		Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities			Consolidated
	($ in millions)
Gross premiums written		$	415.1	$	816.5		$	1,231.6	$	299.0	$	82.8	$	381.8	$	1,613.4		$	—	$	1,613.4		$	(6.8	)	$	1,606.6
Net premiums written			316.2		791.4			1,107.6		201.4		76.7		278.1		1,385.7			—		1,385.7			—			1,385.7
Net premiums earned			308.9		720.3			1,029.2		192.4		75.7		268.1		1,297.3			—		1,297.3			—			1,297.3
Net loss and LAE			162.6		490.6			653.2		94.3		45.0		139.3		792.5			—		792.5			—			792.5
Commissions, brokerage and other    underwriting expenses			103.7		232.3			336.0		53.5		30.6		84.1		420.1			—		420.1			—			420.1
Underwriting (loss) profit(2)		$	42.6	$	(2.6	)	$	40.0	$	44.6	$	0.1	$	44.7		84.7			—		84.7			—			84.7
Net investment income																117.9			1.3		119.2			3.8			123.0
Change in the fair value of equity securities																389.1			—		389.1			3.3			392.4
Net realized capital gains																4.1			0.3		4.4			—			4.4
Credit losses for available for sale securities																(10.0	)		—		(10.0	)		—			(10.0	)
Noninsurance revenue																5.4			505.0		510.4			3.7			514.1
Other operating expenses																29.7			465.4		495.1			7.3			502.4
Corporate administration																1.1			—		1.1			18.3			19.4
Amortization of intangible assets																0.2			6.7		6.9			—			6.9
Interest expense																6.7			4.3		11.0			12.5			23.5
Earnings (losses) before income taxes															$	553.5		$	30.2	$	583.7		$	(27.3	)	$	556.4

(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; mortgage reinsurance; surety; and credit.

(2) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, credit losses for available for sale securities, noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its reinsurance and insurance segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company’s ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.

(c) Identifiable Assets and Equity

The following table presents identifiable assets, the portion of identifiable assets related to cash and invested assets and equity attributable to Alleghany for Alleghany’s reportable segments and for corporate activities as of March 31, 2020:

	Identifiable Assets		Invested Assets and Cash		Equity Attributable to Alleghany
	($ in millions)
Reinsurance segment	$	16,819.8	$	13,077.2	$	4,774.9
Insurance segment		6,414.1		4,697.6		2,377.5
Subtotal		23,233.9		17,774.8		7,152.4
Alleghany Capital		2,131.7		271.5		1,000.7
Total segments		25,365.6		18,046.3		8,153.1
Corporate activities		387.4		317.2		(296.0	)
Consolidated	$	25,753.0	$	18,363.5	$	7,857.1

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(d) Alleghany Capital Noninsurance Revenue

For Alleghany Capital’s industrial and non-industrial operations, noninsurance revenue consists of the sale of manufactured goods and services. The following table presents noninsurance revenue for the Alleghany Capital segment for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020		2019
	($ in millions)
Industrial(1)	$	242.5	$	260.1
Non-Industrial(2)		214.7		244.9
Corporate & other		0.1		—
Alleghany Capital	$	457.3	$	505.0

(1) For the three months ended March 31, 2020 and 2019, the vast majority of noninsurance revenue was recognized as goods and services transferred to customers over time.

(2) For the three months ended March 31, 2020 and 2019, approximately 82 percent 66 percent, respectively, of noninsurance revenue was recognized as services transferred to customers over time, with the remainder recognized as goods transferred at a point in time.

11. Debt

(a) Senior Notes

On September 20, 2010, Alleghany completed a public offering of $300.0 million aggregate principal amount of its 5.625% senior notes due on September 15, 2020 (the “2020 Senior Notes”). The 2020 Senior Notes were unsecured and unsubordinated general obligations of Alleghany. Interest on the 2020 Senior Notes was payable semi-annually on March 15 and September 15 of each year. The terms of the 2020 Senior Notes permitted redemption prior to their maturity. The indenture under which the 2020 Senior Notes were issued contains covenants that impose conditions on Alleghany’s ability to create liens on, or engage in sales of, the capital stock of AIHL or RSUI. The 2020 Senior Notes were issued at approximately 99.6 percent of par, resulting in proceeds after underwriting discount, commissions and other expenses of $298.9 million and an effective yield of approximately 5.67 percent.

On January 15, 2020, Alleghany redeemed all of its outstanding 2020 Senior Notes for $312.7 million, consisting of the $300.0 million aggregate principal amount redeemed, $7.1 million of redemption premium and $5.6 million of accrued and unpaid interest on the principal amount being redeemed to the date of redemption. As a result of this early redemption of the 2020 Senior Notes, Alleghany recorded a realized loss, before tax, of $7.1 million in the first quarter of 2020.

See Note 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for additional information on other Alleghany senior notes outstanding.

(b) Alleghany Capital Operating Subsidiaries

The debt associated with Alleghany Capital’s operating subsidiaries totaled $429.8 million and $367.1 million as of March 31, 2020 and December 31, 2019, respectively, and is generally used to support working capital needs and to help finance acquisitions. As of March 31, 2020, the $429.8 million included:

•       $161.6  million of borrowings by Jazwares under its available credit facilities and borrowings incurred and assumed from its acquisition of Wicked Cool Toys, LLC in October 2019;

• $105.8 million of borrowings by W&W|AFCO Steel under its available credit facility and term loan, including borrowings incurred and assumed from its acquisition of Hirschfeld Holdings, LP in February 2018;

• $74.2 million of term loans at Kentucky Trailer primarily related to borrowings to finance small acquisitions, including its acquisitions of a controlling interest in two manufacturers of aluminum feed transportation equipment in December 2018 and July 2019, and borrowings under its available credit facilities;

• $51.2 million of borrowings by IPS under its available credit facility and term loans, in part to finance a small acquisition in May 2019; and$

• $37.0 million of term loans at PCT primarily related to borrowings to finance the acquisition of a waterjet orifice and nozzle manufacturer in 2016 and the acquisition of a consumable cutting tool manufacturer in June 2019.

None of these liabilities are guaranteed by Alleghany or Alleghany Capital. In December 2019, third-party, floating-rate term loans at Concord were repaid and replaced with approximately $33 million of intercompany floating-rate debt funded by the Alleghany parent company. The intercompany debt and related interest expenses are eliminated at the Alleghany consolidated level.

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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 months ended March 31, 2020 and 2019. 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 March 31, 2020, 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, 2019, or the “2019 Form 10-K.” This discussion contains forward-looking statements that involve risks and uncertainties and that are not historical facts, including statements about our beliefs and expectations. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of various factors, including those discussed below and particularly under the headings “Risk Factors,” “Business” and “Note on Forward-Looking Statements” contained in Item 1A, Item 1, and Part I of the 2019 Form 10-K, respectively.

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;

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

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

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

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

• “PCT” are to our wholly-owned subsidiary Precision Cutting Technologies, Inc. and its subsidiaries;

• “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;

• “Concord” are to our majority-owned subsidiary CHECO 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 effects of outbreaks of pandemics or contagious diseases, including the length and severity of the recent worldwide coronavirus pandemic, known as COVID-19, including its impact on our business;

• 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 2019 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 2019 Form 10-K and Part II, Item 1A, “Risk Factors” of this Form 10-Q for additional information.

26

 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 earnings before income taxes, which are “non-GAAP financial measures,” as such term is defined in Item 10(e) of Regulation S-K promulgated by the SEC. The presentation of these financial measures is not intended to be considered in isolation or as a substitute for, or superior to, financial information prepared and presented in accordance with GAAP. These measures may also be different from non-GAAP financial measures used by other companies, limiting their usefulness for comparison purposes. A discussion of our calculation and use of these financial measures is provided below.

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

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

27

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 $361.2 million in the first quarter of 2020, compared with net earnings of $440.2 million in the first quarter of 2019.

• Net investment income decreased by 8.9 percent in the first quarter of 2020 from the first quarter of 2019.

• Net premiums written increased by 10.7 percent in the first quarter of 2020 from the first quarter of 2019.

• Underwriting loss was $24.4 million in the first quarter of 2020, compared with underwriting profit of $84.7 million in the first quarter of 2019.

• The combined ratio for our reinsurance and insurance segments was 101.7 percent in the first quarter of 2020, compared with 93.5 percent in the first quarter of 2019.

• Catastrophe losses, net of reinsurance, were $181.6 million in the first quarter of 2020, compared with $3.4 million in the first quarter of 2019.

• Net favorable prior accident year loss reserve development was $59.0 million in the first quarter of 2020, compared with $37.4 million in the first quarter of 2019.

• Noninsurance revenue for Alleghany Capital was $457.3 million in the first quarter of 2020, compared with $505.0 million in the first quarter of 2019.

• Earnings before income taxes for Alleghany Capital were $0.3 million in the first quarter of 2020, compared with $30.2 million in the first quarter of 2019. Adjusted earnings before income taxes were $4.6 million in the first quarter of 2020, compared with $36.6 million in the first quarter of 2019.

As of March 31, 2020, we had total assets of $25.8 billion and total stockholders’ equity attributable to Alleghany stockholders of $7.9 billion. As of March 31, 2020, we had consolidated total investments of approximately $16.8 billion, consisting of $13.3 billion invested in debt securities, $1.7 billion invested in equity securities, $0.5 billion invested in short-term investments, $0.7 billion invested in commercial mortgage loans and $0.6 billion invested in other invested assets.

The ongoing COVID-19 global pandemic, or the “Pandemic,” has significantly disrupted many aspects of society as well as financial markets, and has caused widespread global economic dislocation. At the parent and subsidiary levels, we have implemented a variety of business continuation and crisis management policies and procedures to reduce the risk of infection to our employees and others.  

Among other impacts on the economy, the Pandemic has adversely impacted financial markets, which in turn impacted our equity and debt securities portfolio.  In the first quarter of 2020, the fair value of our equity and debt securities depreciated by $523.0 million and $364.6 million, respectively.  As further described below, we have also recorded certain additional credit-related losses on our debt securities portfolio, commercial mortgage loan portfolio and reinsurance recoverables, as well as an impairment loss on our SORC assets due to a significant decline in energy prices as of March 31, 2020.

We also incurred $181.6 million of catastrophe losses in the first quarter of 2020, of which $152.9 million arose from the Pandemic.  Pandemic losses include those from event cancellation coverage for conferences and sporting events as well as other property coverages and, to a lesser extent, accident and health and trade credit.  Our Pandemic loss estimates were based on information available at the time, including an analysis of reported claims, an underwriting review of in-force contracts and other factors requiring considerable judgment.  The impact of the Pandemic will also be reflected in future results, including our second quarter 2020 results.

Of the total Pandemic catastrophe losses, net losses of approximately $74 million related to specific event cancellation treaties, which TransRe began to exit in February 2019.  Total exposed limits on this portfolio are approximately $180 million for 2020 and $40 million for 2021.  Events and event cancellation policies are not uniform in nature.  Ultimate losses will depend on the timing of gathering restrictions being lifted, whether the event can be rescheduled and how far in advance the event is postponed or cancelled.  As such, cancellation or postponement of the event does not necessarily mean a full limit will be paid.  Furthermore, there could be additional incidental losses where event cancellation policies comprise a small portion of exposure to certain multi-line treaties.

We cannot reasonably estimate the length or severity of the Pandemic, or the extent to which the related disruption may adversely impact our results of operations, financial position and cash flows.  Such potential adverse impacts of a prolonged pandemic on our operations, financial position and cash flows include further declines in our equity securities portfolio, additional credit-related realized and unrealized losses on our debt securities and commercial mortgage portfolios, additional credit losses on our reinsurance recoverables and other receivables, further losses from event cancellation and other coverages from our reinsurance and insurance subsidiaries, increased litigation and impairment of certain Alleghany Capital subsidiary goodwill and intangible assets.

28

Consolidated Results of Operations

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

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Revenues
Net premiums earned	$	1,444.4		$	1,297.3
Net investment income		112.0			123.0
Change in the fair value of equity securities		(523.0	)		392.4
Net realized capital gains		13.0			4.4
Credit losses for available for sale securities		(31.4	)		(10.0	)
Noninsurance revenue		467.9			514.1
Total revenues		1,482.9			2,321.2
Costs and Expenses
Net loss and loss adjustment expenses		1,027.4			792.5
Commissions, brokerage and other underwriting expenses		441.4			420.1
Other operating expenses		466.7			502.4
Corporate administration		(14.3	)		19.4
Amortization of intangible assets		9.6			6.9
Interest expense		18.3			23.5
Total costs and expenses		1,949.1			1,764.8
(Losses) earnings before income taxes		(466.2	)		556.4
Income taxes		(104.7	)		108.5
Net (losses) earnings		(361.5	)		447.9
Net (losses) earnings attributable to noncontrolling interests		(0.3	)		7.7
Net (losses) earnings attributable to Alleghany stockholders	$	(361.2	)	$	440.2

Alleghany’s segments are reported in a manner consistent with the way management evaluates the businesses. As such, Alleghany classifies its businesses into three reportable segments – reinsurance, insurance and Alleghany Capital. Corporate activities are not classified as a segment.

29

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 corporate activities. The tables below present the results for our segments and for corporate activities for the three months ended March 31, 2020 and 2019:

	Segments
Three Months Ended March 31, 2020	Reinsurance Segment			Insurance Segment			Subtotal			Alleghany Capital		Total Segments			Corporate Activities(1)			Consolidated
	($ in millions)
Gross premiums written	$	1,327.5		$	451.4		$	1,778.9		$	—	$	1,778.9		$	(8.3	)	$	1,770.6
Net premiums written		1,211.0			322.7			1,533.7			—		1,533.7			—			1,533.7
Net premiums earned		1,133.1			311.3			1,444.4			—		1,444.4			—			1,444.4
Net loss and LAE:
Current year (excluding catastrophe losses)		747.7			157.1			904.8			—		904.8			—			904.8
Current year catastrophe losses		172.2			9.4			181.6			—		181.6			—			181.6
Prior years		(57.7	)		(1.3	)		(59.0	)		—		(59.0	)		—			(59.0	)
Total net loss and LAE		862.2			165.2			1,027.4			—		1,027.4			—			1,027.4
Commissions, brokerage and other    underwriting expenses		349.8			91.6			441.4			—		441.4			—			441.4
Underwriting (loss) profit(2)	$	(78.9	)	$	54.5		$	(24.4	)		—		(24.4	)		—			(24.4	)
Net investment income								109.7			1.8		111.5			0.5			112.0
Change in the fair value of equity securities								(521.6	)		—		(521.6	)		(1.4	)		(523.0	)
Net realized capital gains								45.1			4.9		50.0			(37.0	)		13.0
Credit losses for available for sale securities								(30.7	)		—		(30.7	)		(0.7	)		(31.4	)
Noninsurance revenue								7.4			457.3		464.7			3.2			467.9
Other operating expenses								9.9			450.7		460.6			6.1			466.7
Corporate administration								(2.0	)		—		(2.0	)		(12.3	)		(14.3	)
Amortization of intangible assets								0.4			9.2		9.6			—			9.6
Interest expense								6.7			3.8		10.5			7.8			18.3
Earnings (losses) before income taxes							$	(429.5	)	$	0.3	$	(429.2	)	$	(37.0	)	$	(466.2	)
Loss ratio(3):
Current year (excluding catastrophe losses)		66.0	%		50.5	%		62.6	%
Current year catastrophe losses		15.2	%		3.0	%		12.6	%
Prior years		(5.1	%)		(0.4	%)		(4.1	%)
Total net loss and LAE		76.1	%		53.1	%		71.1	%
Expense ratio(4)		30.9	%		29.4	%		30.6	%
Combined ratio(5)		107.0	%		82.5	%		101.7	%

30

	Segments
Three Months Ended March 31, 2019	Reinsurance Segment			Insurance Segment			Subtotal			Alleghany Capital		Total Segments			Corporate Activities(1)			Consolidated
	($ in millions)
Gross premiums written	$	1,231.6		$	381.8		$	1,613.4		$	—	$	1,613.4		$	(6.8	)	$	1,606.6
Net premiums written		1,107.6			278.1			1,385.7			—		1,385.7			—			1,385.7
Net premiums earned		1,029.2			268.1			1,297.3			—		1,297.3			—			1,297.3
Net loss and LAE:
Current year (excluding catastrophe losses)		689.6			136.9			826.5			—		826.5			—			826.5
Current year catastrophe losses		—			3.4			3.4			—		3.4			—			3.4
Prior years		(36.4	)		(1.0	)		(37.4	)		—		(37.4	)		—			(37.4	)
Total net loss and LAE		653.2			139.3			792.5			—		792.5			—			792.5
Commissions, brokerage and other    underwriting expenses		336.0			84.1			420.1			—		420.1			—			420.1
Underwriting profit(2)	$	40.0		$	44.7		$	84.7			—		84.7			—			84.7
Net investment income								117.9			1.3		119.2			3.8			123.0
Change in the fair value of equity securities								389.1			—		389.1			3.3			392.4
Net realized capital gains								4.1			0.3		4.4			—			4.4
Credit losses for available for sale securities								(10.0	)		—		(10.0	)		—			(10.0	)
Noninsurance revenue								5.4			505.0		510.4			3.7			514.1
Other operating expenses								29.7			465.4		495.1			7.3			502.4
Corporate administration								1.1			—		1.1			18.3			19.4
Amortization of intangible assets								0.2			6.7		6.9			—			6.9
Interest expense								6.7			4.3		11.0			12.5			23.5
Earnings (losses) before income taxes							$	553.5		$	30.2	$	583.7		$	(27.3	)	$	556.4
Loss ratio(4):
Current year (excluding catastrophe losses)		67.0	%		51.1	%		63.7	%
Current year catastrophe losses		—			1.3	%		0.3	%
Prior years		(3.5	%)		(0.4	%)		(2.9	%)
Total net loss and LAE		63.5	%		52.0	%		61.1	%
Expense ratio(4)		32.6	%		31.4	%		32.4	%
Combined ratio(5)		96.1	%		83.4	%		93.5	%

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

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

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

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

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

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Comparison of the Three Months Ended March 31, 2020 and 2019

Premiums. The following table presents our consolidated premiums:

	Three Months Ended March 31,				Percent
	2020		2019		Change
	($ in millions)
Premiums written:
Gross premiums written	$	1,770.6	$	1,606.6		10.2	%
Net premiums written		1,533.7		1,385.7		10.7	%
Net premiums earned		1,444.4		1,297.3		11.3	%

The increase in gross premiums written in the first quarter of 2020 from the first quarter of 2019 is attributable to growth at our reinsurance segment and at RSUI. Growth at our reinsurance segment primarily reflects an increase in various domestic casualty lines of business written, including general liability, professional liability and umbrella lines of business, partially offset by a decrease in property lines of business written globally and the impact of changes in foreign currency exchange rates. In addition, gross premiums written related to a certain large whole account quota share treaty, or the “Quota Share Treaty,” increased slightly to $169.2 million in the first quarter of 2020 from $164.0 million in the first quarter of 2019. Growth at RSUI primarily reflects growth in most lines of business due to increases in business opportunities, higher rates and improved general market conditions, particularly in the property lines of business and, to a lesser extent, the umbrella/excess and directors’ and officers’ liability lines of business.

The increase in net premiums earned in the first quarter of 2020 from the first quarter of 2019 reflects growth in gross premiums written in recent quarters and, to a lesser extent, decreases in ceded premiums written in recent quarters at our reinsurance segment.

A detailed comparison of premiums by segment for the first quarter of 2020 and 2019 is contained in the following pages.

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

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
Net loss and LAE:
Current year (excluding catastrophe losses)	$	904.8		$	826.5			9.5	%
Current year catastrophe losses		181.6			3.4			5,241.2	%
Prior years		(59.0	)		(37.4	)		57.8	%
Total net loss and LAE	$	1,027.4		$	792.5			29.6	%
Loss ratio:
Current year (excluding catastrophe losses)		62.6	%		63.7	%
Current year catastrophe losses		12.6	%		0.3	%
Prior years		(4.1	%)		(2.9	%)
Total net loss and LAE		71.1	%		61.1	%

The increase in net loss and LAE in the first quarter of 2020 from the first quarter of 2019 primarily reflects Pandemic-related catastrophe losses, as discussed above, and the impact of higher net premiums earned, partially offset by higher favorable prior accident year loss reserve development.

A detailed comparison of net loss and LAE by segment for the first quarter of 2020 and 2019 is contained in the following pages.

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

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
Commissions, brokerage and other underwriting expenses	$	441.4		$	420.1			5.1	%
Expense ratio		30.6	%		32.4	%

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The increase in commissions, brokerage and other underwriting expenses in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher net premiums earned, partially offset by lower overall commission rates and lower annual incentive compensation accruals at TransRe.

A detailed comparison of commissions, brokerage and other underwriting expenses by segment for the first quarter of 2020 and 2019 is contained in the following pages.

Underwriting profit. The following table presents our consolidated underwriting profit (loss):

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
Underwriting (loss) profit	$	(24.4	)	$	84.7			(128.8	%)
Combined ratio		101.7	%		93.5	%

The underwriting loss in the first quarter of 2020 compared with the underwriting profit in the first quarter of 2019 primarily reflects Pandemic-related catastrophe losses at our reinsurance segment, as discussed above.

A detailed comparison of underwriting profit by segment for the first quarter of 2020 and 2019 is contained in the following pages.

Investment results. The following table presents our consolidated investment results:

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
Net investment income	$	112.0		$	123.0			(8.9	%)
Change in the fair value of equity securities		(523.0	)		392.4			(233.3	%)
Net realized capital gains		13.0			4.4			195.5	%
Credit losses for available for sale securities		(31.4	)		(10.0	)		214.0	%

The decrease in net investment income in the first quarter of 2020 from the first quarter of 2019 primarily reflects lower partnership income due to the impact of the Pandemic on lower-quality debt securities held by certain of our investment partnerships.

The change in the fair value of equity securities in the first quarter of 2020 reflects significant depreciation in the value of our equity securities portfolio due primarily to the impact of the Pandemic and related economic and financial market disruptions. The change in the fair value of equity securities in the first quarter of 2019 reflects significant appreciation in the value of our equity securities portfolio, primarily from our holdings in the industrial, technology and material sectors.

The increase in net realized capital gains in the first quarter of 2020 from the first quarter of 2019 primarily reflects higher realized gains on our debt securities portfolio, partially offset by a $30.0 million impairment charge from a write-down of certain SORC assets arising from a significant decline in energy prices as of March 31, 2020. The net realized capital losses in the first quarter of 2020 also include a $7.1 million realized loss as a result of an early redemption of certain senior notes as of January 15, 2020 and a $5.0 million realized gain from a reduction of certain contingent consideration liabilities.  See Note 11(a) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information on this early redemption.

The increase in credit losses for available for sale securities in the first quarter of 2020 from the first quarter of 2019 reflects significant declines in fair value of our debt securities portfolio as of March 31, 2020.

A detailed comparison of investment results for the first quarter of 2020 and 2019 is contained in the following pages.

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

	Three Months Ended March 31,					Percent
	2020			2019		Change
	($ in millions)
Noninsurance revenue	$	467.9		$	514.1		(9.0	%)
Other operating expenses		466.7			502.4		(7.1	%)
Corporate administration		(14.3	)		19.4		(173.7	%)
Amortization of intangible assets		9.6			6.9		39.1	%
Interest expense		18.3			23.5		(22.1	%)

Noninsurance revenue and Other operating expenses. Noninsurance revenue and other operating expenses primarily include sales and expenses associated with our Alleghany Capital segment. Other operating expenses also include the long-term incentive compensation of our reinsurance and insurance segments, which totaled $1.2 million and $26.9 million in the first quarter of 2020 and 2019, respectively. The decrease in long-term incentive compensation accruals at our reinsurance and insurance segments in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact on expected payouts from the significant depreciation in the value of our equity and debt securities portfolio compared with significant appreciation in the first quarter of 2019.  Other operating expenses also include a $5.2 million increase in estimates of expected credit losses on commercial mortgage loans, reinsurance recoverables and premium balances receivable at our reinsurance and insurance segments.  This increase was based on current conditions and reasonable and supportable forecasts as of March 31, 2020, which include the impact of the Pandemic, as discussed above.  See Note 1(c), 3(i) and 4(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 credit losses for these assets.

The decreases in noninsurance revenue and other operating expenses in the first quarter of 2020 from the first quarter of 2019 primarily reflect lower sales at Jazwares due primarily to unusually high sales in the first quarter of 2019, and W&W|AFCO Steel due primarily to large construction project timing. The decrease in other operating expenses in the first quarter of 2020 from the first quarter of 2019 also reflect a decrease in long-term incentive compensation accruals at our reinsurance and insurance segments, partially offset by an increase in estimates of expected credit losses, all as discussed above.

Corporate administration. The negative corporate administration expense in the first quarter of 2020 compared with corporate administration expense in the first quarter of 2019 reflects significantly lower Alleghany parent company long-term incentive compensation accruals due primarily to the impacts of depreciation of Alleghany stock price and depreciation in the value of our consolidated equity and debt securities portfolio in the first quarter of 2020 compared with appreciation in the first quarter of 2019.

Amortization of intangible assets. The increase in amortization expense in the first quarter of 2020 from the first quarter of 2019 primarily reflects acquisitions by Jazwares, PCT, Kentucky Trailer and IPS in 2019.

Interest expense. The decrease in interest expense in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of the early redemption of certain senior notes on January 15, 2020. See Note 11(a) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional detail.

A detailed comparison of noninsurance revenue and expenses for the first quarter of 2020 and 2019 is contained in the following pages.

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

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
Income taxes	$	(104.7	)	$	108.5			(196.5	%)
Effective tax rate		22.4	%		19.5	%

The Coronavirus Aid, Relief and Economic Security Act, or the “CARES Act,” was signed into law on March 27, 2020.  Among other provisions, the CARES Act delayed certain employer payroll tax remittance deadlines and created or expanded certain income tax credits and loss carryback provisions and, as a result, we recorded a $6.9 million tax benefit as of March 31, 2020.

The income tax benefit in the first quarter of 2020 compared with the income tax expense in the first quarter of 2019 reflects losses before income taxes compared with earnings before income taxes in the first quarter of 2019, as further discussed below and, to a lesser extent, the impact of the CARES Act. The effective tax rate in the first quarter of 2020 was calculated based on actual results through March 31, 2020 because management was not able to reliably estimate the annual effective tax rate in light of the significant

34

losses incurred.  The increase in the effective tax rate in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of the CARES Act.

Net earnings. The following table presents our consolidated earnings:

	Three Months Ended March 31,					Percent
	2020			2019		Change
	($ in millions)
(Losses) earnings before income taxes	$	(466.2	)	$	556.4		(183.8	%)
Net (losses) earnings attributable to noncontrolling interests		(0.3	)		7.7		(103.9	%)
Net (losses) earnings attributable to Alleghany stockholders		(361.2	)		440.2		(182.1	%)

The losses before income taxes and net losses attributable to Alleghany stockholders in the first quarter of 2020 compared with earnings before income taxes and net earnings attributable to Alleghany stockholders in the first quarter of 2019 primarily reflect the impact of significant depreciation in the value of our equity securities portfolio in the first quarter of 2020 compared with significant appreciation in the first quarter of 2019 and, to a lesser extent, Pandemic-related catastrophe losses and lower earnings at Alleghany Capital, partially offset by significantly lower long-term compensation costs, all as discussed above.

The decrease in net earnings attributable to noncontrolling interests in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of lower overall earnings at Jazwares and, to a lesser extent, W&W|AFCO Steel, partially offset by acquisitions made by PCT, Kentucky Trailer, IPS and Jazwares in 2019 that increased noncontrolling interests.

Reinsurance Segment Underwriting Results

The reinsurance segment is composed of TransRe’s property and casualty & other lines of business. TransRe 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 2019 Form 10-K.

The following tables present the underwriting results of the reinsurance segment:

Three Months Ended March 31, 2020	Property			Casualty & other(1)			Total
	($ in millions)
Gross premiums written	$	412.6		$	914.9		$	1,327.5
Net premiums written		312.9			898.1			1,211.0
Net premiums earned		321.4			811.7			1,133.1
Net loss and LAE:
Current year (excluding catastrophe losses)		174.7			573.0			747.7
Current year catastrophe losses		119.9			52.3			172.2
Prior years		(46.7	)		(11.0	)		(57.7	)
Total net loss and LAE		247.9			614.3			862.2
Commissions, brokerage and other underwriting expenses		105.4			244.4			349.8
Underwriting (loss)(2)	$	(31.9	)	$	(47.0	)	$	(78.9	)
Loss ratio(3):
Current year (excluding catastrophe losses)		54.4	%		70.6	%		66.0	%
Current year catastrophe losses		37.3	%		6.4	%		15.2	%
Prior years		(14.5	%)		(1.4	%)		(5.1	%)
Total net loss and LAE		77.2	%		75.6	%		76.1	%
Expense ratio(4)		32.8	%		30.1	%		30.9	%
Combined ratio(5)		110.0	%		105.7	%		107.0	%

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Three Months Ended March 31, 2019	Property			Casualty & other(1)			Total
	($ in millions)
Gross premiums written	$	415.1		$	816.5		$	1,231.6
Net premiums written		316.2			791.4			1,107.6
Net premiums earned		308.9			720.3			1,029.2
Net loss and LAE:
Current year (excluding catastrophe losses)		173.3			516.3			689.6
Current year catastrophe losses		—			—			—
Prior years		(10.7	)		(25.7	)		(36.4	)
Total net loss and LAE		162.6			490.6			653.2
Commissions, brokerage and other underwriting expenses		103.7			232.3			336.0
Underwriting profit (loss)(2)	$	42.6		$	(2.6	)	$	40.0
Loss ratio(3):
Current year (excluding catastrophe losses)		56.1	%		71.7	%		67.0	%
Current year catastrophe losses		—			—			—
Prior years		(3.5	%)		(3.6	%)		(3.5	%)
Total net loss and LAE		52.6	%		68.1	%		63.5	%
Expense ratio(4)		33.6	%		32.3	%		32.6	%
Combined ratio(5)		86.2	%		100.4	%		96.1	%

(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; mortgage reinsurance; surety; and credit.

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

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

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

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

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

	Three Months Ended March 31,				Percent
	2020		2019		Change
	($ in millions)
Property
Premiums written:
Gross premiums written	$	412.6	$	415.1		(0.6	%)
Net premiums written		312.9		316.2		(1.0	%)
Net premiums earned		321.4		308.9		4.0	%
Casualty & other
Premiums written:
Gross premiums written	$	914.9	$	816.5		12.1	%
Net premiums written		898.1		791.4		13.5	%
Net premiums earned		811.7		720.3		12.7	%
Total
Premiums written:
Gross premiums written	$	1,327.5	$	1,231.6		7.8	%
Net premiums written		1,211.0		1,107.6		9.3	%
Net premiums earned		1,133.1		1,029.2		10.1	%

36

Property. The decrease in gross premiums written in the first quarter of 2020 from the first quarter of 2019 primarily reflects a decreased participation in a large, global property treaty and the impact of recent share reductions and non-renewals of certain catastrophe-exposed business and property excess-of-loss business, as well as the impact of changes in foreign currency exchange rates, partially offset by an increase in premiums written related to the Quota Share Treaty. Gross premiums written related to the Quota Share Treaty were $72.3 million and $64.2 million in the first quarter of 2020 and 2019, respectively. Excluding the impact of changes in foreign currency exchange rates, gross premiums written in the first quarter of 2020 approximated gross premiums written in the first quarter of 2019.

The increase in net premiums earned in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher gross premiums written in recent quarters, partially offset by the impact of changes in foreign currency exchange rates. Excluding the impact of changes in foreign currency exchange rates, net premiums earned increased by 4.7 percent in the first quarter of 2020 from the first quarter of 2019.

Casualty & other. The increase in gross premiums written in the first quarter of 2020 from the first quarter of 2019 primarily reflects higher premiums written in various domestic casualty lines of business, including general liability, professional liability and umbrella lines of business, partially offset by a decrease in premiums written related to the Quota Share Treaty and the impact of changes in foreign currency exchange rates. Gross premiums written related to the Quota Share Treaty were $96.9 million and $99.8 million in the first quarter of 2020 and 2019, respectively. Excluding the impact of changes in foreign currency exchange rates, gross premiums written increased by 12.5 percent in the first quarter of 2020 from the first quarter of 2019.

The increase in net premiums earned in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher gross premiums written in recent quarters, partially offset by the impact of changes in foreign currency exchange rates. Excluding the impact of changes in foreign currency exchange rates, net premiums earned increased by 13.2 percent in the first quarter of 2020 from the first quarter of 2019.

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

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
Property
Net loss and LAE:
Current year (excluding catastrophe losses)	$	174.7		$	173.3			0.8	%
Current year catastrophe losses		119.9			—			-
Prior years		(46.7	)		(10.7	)		336.4	%
Total net loss and LAE	$	247.9		$	162.6			52.5	%
Loss ratio:
Current year (excluding catastrophe losses)		54.4	%		56.1	%
Current year catastrophe losses		37.3	%		—
Prior years		(14.5	%)		(3.5	%)
Total net loss and LAE		77.2	%		52.6	%
Casualty & other
Net loss and LAE:
Current year (excluding catastrophe losses)	$	573.0		$	516.3			11.0	%
Current year catastrophe losses		52.3			—			-
Prior years		(11.0	)		(25.7	)		(57.2	%)
Total net loss and LAE	$	614.3		$	490.6			25.2	%
Loss ratio:
Current year (excluding catastrophe losses)		70.6	%		71.7	%
Current year catastrophe losses		6.4	%		—
Prior years		(1.4	%)		(3.6	%)
Total net loss and LAE		75.6	%		68.1	%
Total
Net loss and LAE:
Current year (excluding catastrophe losses)	$	747.7		$	689.6			8.4	%
Current year catastrophe losses		172.2			—			-
Prior years		(57.7	)		(36.4	)		58.5	%
Total net loss and LAE	$	862.2		$	653.2			32.0	%
Loss ratio:
Current year (excluding catastrophe losses)		66.0	%		67.0	%
Current year catastrophe losses		15.2	%		—
Prior years		(5.1	%)		(3.5	%)
Total net loss and LAE		76.1	%		63.5	%

Property. The increase in net loss and LAE in the first quarter of 2020 from the first quarter of 2019 primarily reflects significant catastrophe losses, partially offset by higher favorable prior accident year loss reserve development. Catastrophe losses in the first quarter of 2020 consisted of $100.6 million of Pandemic-related catastrophe losses, as discussed above, and $19.3 million from an earthquake in Puerto Rico.

38

Net loss and LAE in the first quarter of 2020 and 2019 include (favorable) unfavorable prior accident year loss reserve development as presented in the table below:

	Three Months Ended March 31,
	2020				2019
	($ in millions)
Catastrophe events	$	(32.3	)	(1)	$	8.4		(2)
Non-catastrophe		(14.4	)	(3)		(19.1	)	(4)
Total	$	(46.7	)		$	(10.7	)

(1) Primarily reflects favorable prior accident year loss reserve development related to Typhoon Hagibis in the 2019 accident year and catastrophes in the 2018 accident year.

(2) Primarily reflects unfavorable prior accident year loss reserve development related to Typhoon Jebi in the 2018 accident year, partially offset by favorable prior accident year loss reserve development related to the wildfires in California in the 2018 accident year.

(3) Primarily reflects favorable prior accident year loss reserve development in the 2017 and 2019 accident years.

(4) Primarily reflects favorable prior accident year loss reserve development in the 2016 through 2018 accident years.

The favorable prior accident year loss reserve development in the first quarter of 2020 and 2019 reflects favorable loss emergence compared with loss emergence patterns assumed in prior periods. The favorable prior accident year loss reserve development in the first quarter of 2020 did not impact assumptions used in estimating TransRe’s loss and LAE liabilities for business earned in the first quarter of 2020.

Casualty & other. The increase in net loss and LAE in the first quarter of 2020 from the first quarter of 2019 primarily reflects $52.3 million of Pandemic-related catastrophe losses impacting the casualty lines of business, the impact of higher net premiums earned and lower favorable prior accident year loss reserve development.

Net loss and LAE in the first quarter of 2020 and 2019 include (favorable) unfavorable prior accident year loss reserve development as presented in the table below:

	Three Months Ended March 31,
	2020				2019
	($ in millions)
Malpractice Treaties(1)	$	—			$	—
Other		(11.0	)	(2)		(25.7	)	(3)
Total	$	(11.0	)		$	(25.7	)

(1) Represents certain 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) Primarily reflects favorable prior accident year loss reserve development in the longer-tailed casualty lines of business in the 2013 and earlier accident years, partially offset by unfavorable prior accident year development in the shorter-tailed lines of business in the 2014 through 2019 accident years.

(3) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed lines of business in the 2012 through 2017 prior accident years and in the professional liability lines of business in the 2007 and prior accident years.

The favorable prior accident year loss reserve development in the first quarter of 2020 and 2019 reflects favorable loss emergence compared with loss emergence patterns assumed in prior periods. The favorable prior accident year loss reserve development in the first quarter of 2020 did not impact assumptions used in estimating TransRe’s loss and LAE liabilities for business earned in the first quarter of 2020.

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

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
Property
Commissions, brokerage and other underwriting expenses	$	105.4		$	103.7			1.6	%
Expense ratio		32.8	%		33.6	%
Casualty & other
Commissions, brokerage and other underwriting expenses	$	244.4		$	232.3			5.2	%
Expense ratio		30.1	%		32.3	%
Total
Commissions, brokerage and other underwriting expenses	$	349.8		$	336.0			4.1	%
Expense ratio		30.9	%		32.6	%

Property. The increase in commissions, brokerage and other underwriting expenses in the first quarter of 2020 from the first quarter of 2019 primarily reflects higher overall commission rates and the impact of higher net premiums earned, partially offset by lower annual incentive compensation accruals.

Casualty & other. The increase in commissions, brokerage and other underwriting expenses in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher net premiums earned, partially offset by lower overall commission rates and lower annual incentive compensation accruals.

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

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
Property
Underwriting (loss) profit	$	(31.9	)	$	42.6			(174.9	%)
Combined ratio		110.0	%		86.2	%
Casualty & other
Underwriting (loss)	$	(47.0	)	$	(2.6	)		1,707.7	%
Combined ratio		105.7	%		100.4	%
Total
Underwriting (loss) profit	$	(78.9	)	$	40.0			(297.3	%)
Combined ratio		107.0	%		96.1	%

Property. The underwriting loss in the first quarter of 2020 compared with the underwriting profit in the first quarter of 2019 primarily reflects significantly higher catastrophe losses, primarily related to the Pandemic, as discussed above.

Casualty & other. The increase in underwriting loss in the first quarter of 2020 from the first quarter of 2019 primarily reflects casualty-related Pandemic catastrophe losses, as discussed above.

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Insurance Segment Underwriting Results

The insurance segment is composed of AIHL’s RSUI and CapSpecialty 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 2019 Form 10-K.

The underwriting results of the insurance segment are presented below:

Three Months Ended March 31, 2020	RSUI			CapSpecialty			Total
	($ in millions)
Gross premiums written	$	365.9		$	85.5		$	451.4
Net premiums written		244.5			78.2			322.7
Net premiums earned		229.4			81.9			311.3
Net loss and LAE:
Current year (excluding catastrophe losses)		108.2			48.9			157.1
Current year catastrophe losses		9.3			0.1			9.4
Prior years		(1.5	)		0.2			(1.3	)
Total net loss and LAE		116.0			49.2			165.2
Commissions, brokerage and other underwriting expenses		57.8			33.8			91.6
Underwriting profit (loss)(1)	$	55.6		$	(1.1	)	$	54.5
Loss ratio(2):
Current year (excluding catastrophe losses)		47.2	%		59.8	%		50.5	%
Current year catastrophe losses		4.1	%		0.0	%		3.0	%
Prior years		(0.7	%)		0.3	%		(0.4	%)
Total net loss and LAE		50.6	%		60.1	%		53.1	%
Expense ratio(3)		25.2	%		41.2	%		29.4	%
Combined ratio(4)		75.8	%		101.3	%		82.5	%

Three Months Ended March 31, 2019	RSUI			CapSpecialty			Total
	($ in millions)
Gross premiums written	$	299.0		$	82.8		$	381.8
Net premiums written		201.4			76.7			278.1
Net premiums earned		192.4			75.7			268.1
Net loss and LAE:
Current year (excluding catastrophe losses)		94.9			42.0			136.9
Current year catastrophe losses		3.1			0.3			3.4
Prior years		(3.7	)		2.7			(1.0	)
Total net loss and LAE		94.3			45.0			139.3
Commissions, brokerage and other underwriting expenses		53.5			30.6			84.1
Underwriting profit(1)	$	44.6		$	0.1		$	44.7
Loss ratio(2):
Current year (excluding catastrophe losses)		49.3	%		55.5	%		51.1	%
Current year catastrophe losses		1.6	%		0.3	%		1.3	%
Prior years		(1.9	%)		3.7	%		(0.4	%)
Total net loss and LAE		49.0	%		59.5	%		52.0	%
Expense ratio(3)		27.8	%		40.4	%		31.4	%
Combined ratio(4)		76.8	%		99.9	%		83.4	%

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

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

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(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.

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

	Three Months Ended March 31,				Percent
	2020		2019		Change
	($ in millions)
RSUI
Premiums written:
Gross premiums written	$	365.9	$	299.0		22.4	%
Net premiums written		244.5		201.4		21.4	%
Net premiums earned		229.4		192.4		19.2	%
CapSpecialty
Premiums written:
Gross premiums written	$	85.5	$	82.8		3.3	%
Net premiums written		78.2		76.7		2.0	%
Net premiums earned		81.9		75.7		8.2	%
Total
Premiums written:
Gross premiums written	$	451.4	$	381.8		18.2	%
Net premiums written		322.7		278.1		16.0	%
Net premiums earned		311.3		268.1		16.1	%

RSUI. The increase in gross premiums written in the first quarter of 2020 from the first quarter of 2019 primarily reflects growth in most lines of business due to increases in business opportunities, higher rates and improved general market conditions, particularly in the property lines of business and, to a lesser extent, the umbrella/excess and directors’ and officers’ liability lines of business.

The increase in net premiums earned in the first quarter of 2020 from the first quarter of 2019 primarily reflects increases in gross premiums written in recent quarters, partially offset by higher ceded premiums earned related to the growth in the heavily-reinsured property lines of business.

CapSpecialty. The increase in gross premiums written in the first quarter of 2020 from the first quarter of 2019 primarily reflects growth in the specialty casualty lines of business, due to increases in business opportunities, CapSpecialty’s expanded product offerings and the impact of CapSpecialty’s purchase in September 2019 of certain renewal rights to a small lawyer’s professional liability block of business, partially offset by a curtailment of certain unprofitable broker relationships.

The increase in net premiums earned in the first quarter of 2020 from the first quarter of 2019 primarily reflects increases in gross premiums written in recent quarters.

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

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
RSUI
Net loss and LAE:
Current year (excluding catastrophe losses)	$	108.2		$	94.9			14.0	%
Current year catastrophe losses		9.3			3.1			200.0	%
Prior years		(1.5	)		(3.7	)		(59.5	%)
Total net loss and LAE	$	116.0		$	94.3			23.0	%
Loss ratio:
Current year (excluding catastrophe losses)		47.2	%		49.3	%
Current year catastrophe losses		4.1	%		1.6	%
Prior years		(0.7	%)		(1.9	%)
Total net loss and LAE		50.6	%		49.0	%
CapSpecialty
Net loss and LAE:
Current year (excluding catastrophe losses)	$	48.9		$	42.0			16.4	%
Current year catastrophe losses		0.1			0.3			(66.7	%)
Prior years		0.2			2.7			(92.6	%)
Total net loss and LAE	$	49.2		$	45.0			9.3	%
Loss ratio:
Current year (excluding catastrophe losses)		59.8	%		55.5	%
Current year catastrophe losses		—			0.3	%
Prior years		0.3	%		3.7	%
Total net loss and LAE		60.1	%		59.5	%
Total
Net loss and LAE:
Current year (excluding catastrophe losses)	$	157.1		$	136.9			14.8	%
Current year catastrophe losses		9.4			3.4			176.5	%
Prior years		(1.3	)		(1.0	)		30.0	%
Total net loss and LAE	$	165.2		$	139.3			18.6	%
Loss ratio:
Current year (excluding catastrophe losses)		50.5	%		51.1	%
Current year catastrophe losses		3.0	%		1.3	%
Prior years		(0.4	%)		(0.4	%)
Total net loss and LAE		53.1	%		52.0	%

RSUI. The increase in net loss and LAE in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher net premiums earned and, to a lesser extent, higher catastrophe losses and lower favorable prior accident year loss reserve development.

Catastrophe losses in the first quarter of 2020 primarily relate to a tornado in Tennessee and severe weather and flooding in the Southeastern U.S. Catastrophe losses in the first quarter of 2019 primarily relate to severe weather and flooding in the Midwestern U.S.

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Net loss and LAE in the first quarter of 2020 and 2019 include (favorable) unfavorable prior accident year loss reserve development as presented in the table below:

	Three Months Ended March 31,
	2020				2019
	($ in millions)
Casualty	$	(1.0	)	(1)	$	(5.6	)	(2)
Property and other		(0.5	)	(3)		1.9		(4)
Total	$	(1.5	)		$	(3.7	)

(1) Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in recent accident years.

(2) Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in the 2017 accident year.

(3) Primarily reflects favorable prior accident year loss reserve development related to catastrophes in the 2018 accident year, partially offset by unfavorable prior accident year loss reserve development related to catastrophes in the 2017 accident year.

(4) Primarily reflects unfavorable prior accident year loss reserve development related to Hurricanes Harvey in the 2017 accident year and Florence in the 2018 accident year.

The favorable prior accident year loss reserve development in the first quarter of 2020 and 2019 reflect favorable loss emergence compared with loss emergence patterns assumed in prior periods. The favorable prior accident year loss reserve development in the first quarter of 2020 did not impact assumptions used in estimating RSUI’s loss and LAE liabilities for business earned in the first quarter of 2020.

CapSpecialty. The increase in net loss and LAE in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher net premiums earned and higher current accident year losses, partially offset by lower unfavorable prior accident year loss reserve development in the first quarter of 2020.

Net loss and LAE in the first quarter of 2020 and 2019 include unfavorable prior accident year loss reserve development in certain specialty lines of business written through a program administrator in connection with a terminated program in the 2009 and 2010 accident years.  The unfavorable prior accident year loss reserve development in the first quarter of 2020 and 2019 reflects unfavorable loss emergence compared with loss emergence patterns assumed in prior periods. The unfavorable prior accident year loss reserve development in the first quarter of 2020 did not impact assumptions used in estimating CapSpecialty’s loss and LAE liabilities for business earned in the first quarter of 2020.

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 March 31,						Percent
	2020			2019			Change
	($ in millions)
RSUI
Commissions, brokerage and other underwriting expenses	$	57.8		$	53.5			8.0	%
Expense ratio		25.2	%		27.8	%
CapSpecialty
Commissions, brokerage and other underwriting expenses	$	33.8		$	30.6			10.5	%
Expense ratio		41.2	%		40.4	%
Total
Commissions, brokerage and other underwriting expenses	$	91.6		$	84.1			8.9	%
Expense ratio		29.4	%		31.4	%

RSUI. The increase in commissions, brokerage and other underwriting expenses in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher net premiums earned, partially offset by slightly lower overall commission rates.

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CapSpecialty. The increase in commissions, brokerage and other underwriting expenses in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher net premiums earned and investments in technology.

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

	Three Months Ended March 31,						Percent
	2020			2019			Change
	($ in millions)
RSUI
Underwriting profit	$	55.6		$	44.6			24.7	%
Combined ratio		75.8	%		76.8	%
CapSpecialty
Underwriting (loss) profit	$	(1.1	)	$	0.1			(1,200.0	%)
Combined ratio		101.3	%		99.9	%
Total
Underwriting profit	$	54.5		$	44.7			21.9	%
Combined ratio		82.5	%		83.4	%

RSUI. The increase in underwriting profit in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of higher net premiums earned, partially offset by higher catastrophe losses and lower favorable prior accident year reserve development, all as discussed above.

CapSpecialty. The underwriting loss in the first quarter of 2020 compared with the underwriting profit in the first quarter of 2019 primarily reflects higher current accident year losses, partially offset by less unfavorable prior accident year loss reserve development, 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 March 31,						Percent
	2020			2019			Change
	($ in millions)
Net investment income	$	109.7		$	117.9			(7.0	%)
Change in the fair value of equity securities		(521.6	)		389.1			(234.1	%)
Net realized capital gains		45.1			4.1			1,000.0	%
Credit losses for available for sale securities		(30.7	)		(10.0	)		207.0	%

Net investment income. The decrease in net investment income in the first quarter of 2020 from the first quarter of 2019 primarily reflects lower partnership income due to the impact of the Pandemic on lower-quality debt securities held by certain of our investment partnerships.

Change in the fair value of equity securities. The change in the fair value of equity securities in the first quarter of 2020 reflects significant depreciation in the value of our equity securities portfolio due primarily to the impact of the Pandemic and related economic and financial market disruptions, as discussed above. The change in the fair value of equity securities in the first quarter of 2019 reflects appreciation in the value of our equity securities portfolio, primarily from our holdings in the technology, industrial and financial sectors.

Net realized capital gains. The increase in net realized capital gains in the first quarter of 2020 from the first quarter of 2019 primarily reflects higher realized gains on our debt securities.

Credit losses for available for sale securities. Credit losses in the first quarter of 2020 reflect $30.7 million of unrealized losses on debt securities, primarily related to the energy sector and lower-quality corporate bonds in other sectors due to a significant decline in their fair value relative to their amortized cost.  Credit losses in the first quarter of 2019 reflect $10.0 million, primarily related to the energy sector and the deterioration of creditworthiness of the issuers.

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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 credit losses, credit quality and gross unrealized investment losses for debt securities as of and for the three months ended March 31, 2020.

Alleghany Capital Segment Results

The Alleghany Capital segment consists of: (i) industrial operations conducted through PCT, Kentucky Trailer, W&W|AFCO Steel and, through March 31, 2020, a 45 percent equity interest in Wilbert Funeral Services, Inc., or “Wilbert;” (ii) non-industrial operations conducted through IPS, Jazwares and Concord; and (iii) corporate operations at the Alleghany Capital level. Wilbert is accounted for under the equity method of accounting and is included in other invested assets. On April 1, 2020, Alleghany Capital acquired an additional approximately 55 percent of Wilbert it previously did not own, bringing its equity interest in Wilbert to approximately 100 percent, and as of that date, the results of Wilbert will be included in our consolidated results.

The following table presents the results of the Alleghany Capital segment for the first three months of 2020 and 2019:

	Three Months Ended March 31, 2020												Three Months Ended March 31, 2019
	Industrial			Non- industrial			Corp. & other			Total			Industrial			Non- industrial		Corp. & other			Total
	($ in millions)
Noninsurance revenue(1)	$	242.5		$	214.7		$	0.1		$	457.3		$	260.1		$	244.9	$	—		$	505.0
Net investment income		1.8			—			—			1.8			0.9			—		0.4			1.3
Net realized capital gains		5.1			(0.2	)		—			4.9			0.3			—		—			0.3
Total revenues	$	249.4		$	214.5		$	0.1		$	464.0		$	261.3		$	244.9	$	0.4		$	506.6
Other operating expenses(1)		236.9			213.8			—			450.7			244.2			216.2		5.0			465.4
Amortization of intangible assets		3.3			5.9			—			9.2			2.5			4.2		—			6.7
Interest expense		2.0			2.4			(0.6	)		3.8			2.9			1.4		—			4.3
Earnings (losses) before income taxes	$	7.2		$	(7.6	)	$	0.7		$	0.3		$	11.7		$	23.1	$	(4.6	)	$	30.2
Earnings (losses) before income taxes	$	7.2		$	(7.6	)	$	0.7		$	0.3		$	11.7		$	23.1	$	(4.6	)	$	30.2
Less: net realized capital gains		(5.1	)		0.2			—			(4.9	)		(0.3	)		—		—			(0.3	)
Add: amortization of intangible assets		3.3			5.9			—			9.2			2.5			4.2		—			6.7
Adjusted earnings (losses) before income taxes(2)	$	5.4		$	(1.5	)	$	0.7		$	4.6		$	13.9		$	27.3	$	(4.6	)	$	36.6

(1) For industrial and non-industrial operations: (i) noninsurance revenue consists of the sale of manufactured goods and services; and (ii) other operating expenses consist of the cost of goods and services sold and selling, general and administrative expenses. Other operating expenses also include finders’ fees, legal and accounting costs and other transaction-related expenses of $2.8 million and $0.4 million for the first quarter of 2020 and 2019, respectively.

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

The changes in Alleghany Capital’s equity for the three months ended March 31, 2020 and 2019 are presented in the table below:

	Three Months Ended March 31,
	2020												2019
	Industrial			Non- industrial			Corp. & other			Total			Industrial			Non- industrial			Corp. & other			Total
	($ in millions)
Equity, beginning of period	$	523.3		$	410.6		$	(33.0	)	$	900.9		$	462.5		$	443.3		$	(44.2	)	$	861.6
Earnings (losses) before income taxes		7.2			(7.6	)		0.7			0.3			11.7			23.1			(4.6	)		30.2
Income taxes(1)		(1.5	)		0.1			0.3			(1.1	)		(0.2	)		(1.3	)		(5.3	)		(6.8	)
Net earnings attributable to noncontrolling interests(2)		—			0.2			—			0.2			(2.2	)		(5.5	)		—			(7.7	)
Capital contributions (returns of capital) and other(3)		13.0			65.1			22.3			100.4			(4.8	)		(22.0	)		11.7			(15.1	)
Equity, end of period	$	542.0		$	468.4		$	(9.7	)	$	1,000.7		$	467.0		$	437.6		$	(42.4	)	$	862.2

(1) Federal income taxes for most Alleghany Capital subsidiaries are incurred at the Alleghany Capital corporate level. Estimated federal income tax (expense) benefit incurred at the Alleghany Capital corporate level attributable to industrial and non-industrial operations for the three months ended March 31, 2020 was ($1.5) million and $1.6 million, respectively, and for the three months ended March 31, 2019 was ($2.3) million and ($4.9) million, respectively.

(2) During the first three months of 2020, the noncontrolling interests outstanding were approximately as follows: Kentucky Trailer - 23 percent; W&W|AFCO Steel - 20 percent; IPS - 15 percent; Jazwares - 25 percent; and Concord - 15 percent. Prior to April 1, 2019, the noncontrolling interests of PCT were approximately 11 percent. All noncontrolling interest holders of PCT have exercised their repurchase options and sold their ownership interests to PCT effective April 1, 2019.

(3) For the three months ended March 31, 2020, capital contributions primarily reflect funding provided by: (i) Alleghany Capital to PCT for its acquisition of a manufacturer of high-performance carbide end mills in March 2020; (ii) Alleghany Capital to Jazwares in advance of its acquisition of a plush toy manufacturer that closed on April 1, 2020; and (iii) Alleghany to Alleghany Capital in advance of its purchase of an additional approximately 55 percent of Wilbert it previously did not own that closed on April 1, 2020.

Noninsurance revenue. The decrease in noninsurance revenue in the first quarter of 2020 from the first quarter of 2019 reflects decreases in non-industrial and industrial operations.

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The decrease in non-industrial noninsurance revenue primarily reflects lower sales at Jazwares due to the acquisition of a major new video game license in the fourth quarter of 2018, which positively impacted sales in the first quarter of 2019 and, to a lesser extent, Pandemic-related temporary disruptions to shipping schedules in the first quarter of 2020.  Typically, the first quarter of the year is a seasonal low for the sale of toys.    

The decrease in industrial noninsurance revenue primarily reflects the timing of revenue recognition on certain large construction projects at W&W|AFCO Steel and, to a lesser extent, the impact of Pandemic-related safety measures undertaken during the first quarter of 2020.

Net investment income. The increase in net investment income in the first quarter of 2020 from the first quarter of 2019 primarily reflects higher earnings at Wilbert, due to an increase in revenues arising from recent business acquisitions.

Net realized capital gains.  Net realized capital gains in the first quarter of 2020 primarily reflect realized gains from a reduction of certain contingent consideration liabilities at the PCT-level in connection with its acquisition of a provider of high-performance solid carbide end mills in June 2019.

Other operating expenses. The decrease in other operating expenses in the first quarter of 2020 from the first quarter of 2019 primarily reflects decreases in costs related to declines in revenues in non-industrial and, to a lesser extent, industrial operations, as described above.  The decrease in other operating expenses also reflects lower incentive compensation accruals in Alleghany Capital’s corporate operations due to a decline in overall financial performance.

Amortization of intangible assets. The increase in amortization expense in the first quarter of 2020 from the first quarter of 2019 primarily reflects acquisitions by Jazwares, PCT, Kentucky Trailer and IPS in 2019.

Interest expense. The decrease in interest expense in the first quarter of 2020 from the first quarter of 2019 primarily reflects as lower overall borrowings to support working capital needs.

Earnings (losses) before income taxes. The decrease in earnings before income taxes in the first quarter of 2020 from the first quarter of 2019 primarily reflects lower earnings before income taxes in the non-industrial operations due to the impact of lower sales and margins at Jazwares, as discussed above.  A modest decrease in industrial earnings before income taxes, due primarily to lower sales at W&W|AFCO Steel, was offset by lower incentive compensation accruals in Alleghany Capital’s corporate operations, as discussed above. In addition, earnings at our industrial and non-industrial operations were negatively impacted by the costs of Pandemic-related safety measures undertaken during the first quarter of 2020.

Corporate Activities Results

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

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Net premiums earned	$	—		$	—
Net investment income		0.5			3.8
Change in the fair value of equity securities		(1.4	)		3.3
Net realized capital gains		(37.0	)		—
Credit losses for available for sale securities		(0.7	)		—
Noninsurance revenue		3.2			3.7
Total revenues		(35.4	)		10.8
Net loss and loss adjustment expenses		—			—
Commissions, brokerage and other underwriting expenses		—			—
Other operating expenses		6.1			7.3
Corporate administration		(12.3	)		18.3
Amortization of intangible assets		—			—
Interest expense		7.8			12.5
Earnings (losses) before income taxes	$	(37.0	)	$	(27.3	)

Net investment income. The decrease in net investment income in the first quarter of 2020 from the first quarter of 2019 primarily reflects lower partnership income and, to a lesser extent, lower interest income.

Change in the fair value of equity securities. In the first quarter of 2019, a substantial portion of our investment portfolio at the Alleghany parent company-level was reallocated from equity securities to debt securities.  The change in the fair value of equity

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securities in the first quarter of 2020 reflects significant depreciation in the value of equity securities that remain at the Alleghany Parent company-level due primarily to the impact of the Pandemic, as discussed above. The change in the fair value of equity securities in the first quarter of 2019 reflects appreciation in the value of the equity securities held at the Alleghany parent company-level, primarily from holdings in the technology sector, prior to the reallocation.

Net realized capital gains. The net realized capital losses in the first quarter of 2020 primarily reflects a $30.0 million impairment charge from a write-down of certain SORC assets arising from a significant decline in energy prices as of March 31, 2020 and a $7.1 million realized loss as a result of an early redemption of certain senior notes as of January 15, 2020.  See Note 11(a) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information on this early redemption.

Noninsurance revenue. The slight decrease in noninsurance revenue in the first quarter of 2020 from the first quarter of 2019 primarily reflects lower energy sales at SORC.

Other operating expenses. The decrease in other operating expenses in the first quarter of 2020 from the first quarter of 2019 primarily reflects reduced costs at SORC.

Corporate administration. The negative corporate administration expense in the first quarter of 2020 compared with corporate administration expense in the first quarter of 2019 reflects significantly lower Alleghany parent company long-term incentive compensation accruals due primarily to the impacts of depreciation of Alleghany stock price and depreciation in the value of our consolidated equity and debt securities portfolio in the first quarter of 2020 compared with appreciation in the first quarter of 2019.

Interest expense. The decrease in interest expense in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of the early redemption of certain senior notes on January 15, 2020, as discussed above.

(Losses) before income taxes. The increase in losses before income taxes in the first quarter of 2020 from the first quarter of 2019 primarily reflects a write-down of certain SORC assets and realized loss on early redemption of certain senior notes in the first quarter of 2020, partially offset by the impact of significantly lower Alleghany parent company long-term incentive compensation accruals, all as discussed above.

Reserve Review Process

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

	As of March 31, 2020								As of December 31, 2019
	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	$	1,982.6		$	(563.0	)	$	1,419.6	$	1,965.5		$	(604.3	)	$	1,361.2
Casualty & other(1)		7,453.6			(310.4	)		7,143.2		7,358.3			(303.2	)		7,055.1
		9,436.2			(873.4	)		8,562.8		9,323.8			(907.5	)		8,416.3
Insurance Segment
Property		409.2			(142.2	)		267.0		409.0			(142.2	)		266.8
Casualty(2)		2,096.7			(514.1	)		1,582.6		2,075.3			(537.3	)		1,538.0
Workers' Compensation		2.1			—			2.1		2.3			—			2.3
All other(3)		185.4			(93.0	)		92.4		183.7			(62.6	)		121.1
		2,693.4			(749.3	)		1,944.1		2,670.3			(742.1	)		1,928.2
Eliminations		(63.2	)		63.2			—		(65.7	)		65.7			—
Total	$	12,066.4		$	(1,559.5	)	$	10,506.9	$	11,928.4		$	(1,583.9	)	$	10,344.5

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(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; mortgage reinsurance; 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 March 31, 2020 and December 31, 2019. Gross and net loss and LAE reserves as of March 31, 2020 increased from December 31, 2019, primarily reflecting the impact of growing net premiums earned and catastrophe losses incurred in the first quarter of 2020, partially offset by payments on catastrophe losses incurred in 2017, 2018 and 2019 and favorable prior accident year loss reserve development, 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 premiums writings and risk capacity without requiring additional capital. Our reinsurance and insurance subsidiaries generally purchase reinsurance and retrocessional coverages from highly-rated third-party reinsurers or on a collateralized basis. 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 March 31, 2020, our reinsurance and insurance subsidiaries had total reinsurance recoverables of $1,628.6 million, consisting of $1,559.5 million of ceded outstanding loss and LAE and $75.9 million of recoverables on paid losses, less $6.8 million of an allowance for credit losses.  See Note 4 to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information on: (i) the reinsurance purchased by our reinsurance and insurance subsidiaries; (ii) the allowance for credit losses; (iii) the concentration of our reinsurance recoverables; and (iv) the ratings profile of our reinsurers.

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 and reported revenues and expenses 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, credit losses for available for sale securities, 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.

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See Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Estimates” of the 2019 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 of, or substantial investments in, operating companies. As of March 31, 2020, we held total marketable securities and cash of $685.4 million, compared with $1,283.3 million as of December 31, 2019. The decrease in marketable securities and cash in the first quarter of 2020 primarily reflects the redemption of certain senior notes and a special dividend paid in the first quarter of 2020, as discussed below, as well as depreciation in the value of the equity securities portfolio held at the holding company-level, as discussed above, partially offset by receipt of dividends from TransRe and RSUI. The $685.4 million is composed of $228.5 million at the Alleghany parent company, $403.9 million at AIHL and $53.0 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 March 31, 2020.

Stockholders’ equity attributable to Alleghany stockholders was approximately $7.9 billion as of March 31, 2020, compared with approximately $8.8 billion as of December 31, 2019. The decrease in stockholders’ equity in the first three months of 2020 primarily reflects net losses attributable to Alleghany stockholders, as discussed above, as well as a special dividend, repurchases of our common stock and depreciation in the value of our debt securities portfolio, all as discussed below. As of March 31, 2020, we had 14,309,682 shares of our common stock outstanding, compared with 14,364,628 shares of our common stock outstanding as of December 31, 2019.

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, and on January 15, 2020, we redeemed these senior notes.  See Note 11(a) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for additional information on our senior notes and our early redemption of debt.

Credit Agreement. On July 31, 2017, we entered into a five-year credit agreement, or the “Credit Agreement,” with certain lenders party thereto, which provides for an unsecured revolving credit facility in an aggregate principal amount of up to $300.0 million. The credit facility is scheduled to expire on July 31, 2022, unless earlier terminated. Borrowings under the Credit Agreement will be available for working capital and general corporate purposes, including permitted acquisitions and repurchases of common stock. Borrowings under the Credit Agreement bear a floating rate of interest based in part on our credit rating, among other factors. The Credit Agreement contains representations, warranties and covenants customary for bank loan facilities of this nature.

There were no borrowings under the Credit Agreement from inception through March 31, 2020.

Common Stock Repurchases. In June 2018, our Board of Directors authorized the repurchase of additional shares of our common stock at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million. In September 2019, our Board of Directors authorized, upon the completion of the previously announced program, the repurchase of additional shares of our common stock at such times and at prices as management determines to be advisable, up to an aggregate of $500.0 million. As of March 31, 2020, we had $582.9 million remaining under our repurchase authorizations.

The following table presents the shares of our common stock that we repurchased in the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020		2019
Shares repurchased		62,540		129,567
Cost of shares repurchased (in millions)	$	44.3	$	80.5
Average price per share repurchased	$	707.84	$	621.19

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Special Dividend. In February 2020, our Board of Directors declared a special dividend of $15.00 per share for stockholders of record on March 5, 2020. On March 15, 2020, we paid dividends to stockholders totaling $215.0 million.

Investments in Certain Variable Interest Entities. 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 and AIHL invested in limited partnership funds managed by Pillar Holdings, or the “Funds.” We have concluded that both Pillar Holdings and the Funds, or collectively, the “Pillar Investments,” represent variable interest entities and that we are not the primary beneficiary, as we do not have the ability to direct the activities that most significantly impact each entity’s economic performance. Therefore, the Pillar Investments are not consolidated and are accounted for under the equity method of accounting. See Note 3(h) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information on Pillar Investments as of March 31, 2020.

Investments in Commercial Mortgage Loans. As of March 31, 2020, the carrying value of our commercial mortgage loan portfolio was $682.7 million, representing the unpaid principal balance on the loans, less allowance for credit losses. See Note 3(i) 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 ratings of our commercial mortgage portfolio as of March 31, 2020.

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 March 31, 2020.

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

Included in Alleghany Capital is debt associated with its operating subsidiaries, which totaled $429.8 million as of March 31, 2020, which is generally used to support working capital needs and to help finance acquisitions. The $429.8 million included:

• $161.6 million of borrowings by Jazwares under its available credit facilities and borrowings incurred and assumed from its acquisition of Wicked Cool Toys, LLC in October 2019;

• $105.8 million of borrowings by W&W|AFCO Steel under its available credit facilities and term loans (including borrowings incurred and assumed from its acquisition of Hirschfeld Holdings, LP in February 2018);

• $74.2 million of term loans at Kentucky Trailer primarily related to borrowings to finance small acquisitions, including its acquisitions of controlling interests in certain manufacturers of aluminum feed transportation equipment in December 2018 and July 2019, and borrowings under its available credit facilities;

• $51.2 million of borrowings by IPS under its available credit facility and term loans, in part to finance a small acquisition in May 2019; and a$

• $37.0 million of term loans at PCT primarily related to borrowings to finance the acquisition of a waterjet orifice and nozzle manufacturer in 2016 and the acquisition of a consumable cutting tool manufacturer in June 2019.

None of these liabilities are guaranteed by Alleghany or Alleghany Capital. In December 2019, third-party, floating-rate term loans at Concord were repaid and replaced with approximately $33 million of intercompany floating-rate debt funded by the Alleghany parent company. The intercompany debt and related interest expenses are eliminated at the Alleghany consolidated level.

With respect to corporate activities, SORC has relied on Alleghany almost entirely to support its operations. From its formation in 2011 through March 31, 2020, we have invested $276.6 million in SORC.

Consolidated Investment Holdings

Investment Strategy and Holdings. Our investment strategy seeks to preserve principal and maintain liquidity while trying to maximize our risk-adjusted, after-tax rate of return. Our investment decisions are guided mainly by the nature and timing of expected liability payouts, management’s forecast of cash flows and the possibility of unexpected cash demands, such as, to satisfy claims due to catastrophe losses. Our consolidated investment portfolio 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 three large, reputable rating agencies.  In this regard, the overall weighted-average credit quality rating of our debt securities portfolio as of

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March 31, 2020 and December 31, 2019 was AA-. Although a portion 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 March 31, 2020. See Note 3(f) 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 ratings of our debt securities portfolio as of March 31, 2020.

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.

Effective duration measures a portfolio’s sensitivity to changes in interest rates. In this regard, as of March 31, 2020 and December 31, 2019, our debt securities portfolio had an effective duration of approximately 4.6 years and 4.2 years, respectively. The increase in duration during the first quarter of 2020 primarily reflects a decline in risk-free interest rates and a related decrease in the likelihood that many of our municipal bonds and mortgage-backed securities will be prepaid.  As of March 31, 2020, approximately $3.6 billion, or 27 percent, of our debt securities portfolio represented securities with maturities of five years or less. See Note 3(b) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional detail on the contractual maturities of our consolidated debt securities portfolio. We may increase the proportion of our debt securities portfolio held in securities with maturities of more than five years should the yields of these securities provide, in our judgment, sufficient compensation for their increased risk. We do not believe that this strategy would reduce our ability to meet ongoing claim payments or to respond to significant catastrophe losses.

In the event paid losses accelerate beyond the ability of our reinsurance and insurance subsidiaries to fund these paid losses from current cash balances, current operating cash flow, dividend and interest receipts and security maturities, we would need to liquidate a portion of our investment portfolio, make capital contributions to our reinsurance and insurance subsidiaries, and/or arrange for financing. Strains on liquidity could result from: (i) the occurrence of several significant catastrophe events in a relatively short 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, as of March 31, 2020, our invested assets decreased to approximately $16.8 billion from approximately $18.9 billion as of December 31, 2019, primarily reflecting depreciation in the value of our equity securities portfolio, the early redemption of certain senior notes in January 2020, the special dividend payment and repurchases of shares of our common stock, all as discussed above, as well as depreciation in the value of our debt securities portfolio. The depreciation in the value of our debt securities portfolio reflects an increase in credit spreads in the first quarter of 2020, partially offset by a decrease in risk-free interest rates.

Fair Value. 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 “inactive” 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. See Note 1 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for additional information on our accounting policy on fair value.

The following table presents the carrying values and estimated fair values of our consolidated financial instruments as of March 31, 2020 and December 31, 2019:

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	March 31, 2020				December 31, 2019
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	15,584.6	$	15,584.6	$	17,632.3	$	17,632.3
Liabilities
Senior notes and other debt(2)	$	1,514.4	$	1,674.8	$	1,751.1	$	1,962.7

(1) This table includes debt and equity securities, as well as partnership and non-marketable equity investments accounted for 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 accounted for at unpaid principal balance.

(2) See Note 11 to Notes to Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q for additional information on the senior notes and other debt.

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 information on our financial instruments measured at fair value and the level of the fair value hierarchy of inputs used as of March 31, 2020 and December 31, 2019.

Municipal Bonds. The following table provides the fair value of our municipal bonds as of March 31, 2020, 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	$	1.1	$	—	$	2.5	$	8.4	$	104.6	$	77.0	$	20.0	$	—	$	213.6	$	12.3	$	225.9
California		11.4		40.5		—		2.0		2.5		23.3		53.9		—		133.6		61.5		195.1
Texas		14.6		—		0.2		5.2		7.9		35.9		58.8		1.9		124.5		46.1		170.6
Massachusetts		20.6		5.6		8.3		—		27.2		1.3		21.3		0.3		84.6		58.1		142.7
Pennsylvania		3.0		1.5		9.6		—		—		33.1		4.2		31.3		82.7		38.5		121.2
Washington		—		—		1.8		—		3.3		11.0		22.0		2.4		40.5		44.8		85.3
Florida		—		0.3		3.6		—		11.3		43.1		6.8		9.7		74.8		8.5		83.3
Ohio		35.9		1.2		—		1.2		2.2		0.2		10.6		8.9		60.2		20.7		80.9
Utah		5.7		—		—		—		17.5		18.6		17.3		—		59.1		6.4		65.5
Georgia		10.0		—		4.2		10.5		20.3		—		15.8		2.6		63.4		—		63.4
All other states		96.3		67.6		34.2		59.4		37.7		53.1		130.4		113.3		592.0		201.8		793.8
Total	$	198.6	$	116.7	$	64.4	$	86.7	$	234.5	$	296.6	$	361.1	$	170.4	$	1,529.0	$	498.7		2,027.7
Total advanced refunded / escrowed maturity funds																						244.9
Total municipal bonds																					$	2,272.6

Recent Accounting Standards

For a discussion of recently adopted accounting standards, see Note 1(c) to Notes to Unaudited Consolidated Financial Statements set forth in Part I, Item 1, “Financial Statements” of this Form 10-Q.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Market risk is the risk of loss from adverse changes in market prices and rates. The primary market risk related to our debt securities is the risk of loss associated with adverse changes in interest rates. We hold our debt securities as available for sale. Any changes in the fair value in these securities, net of tax, would be recorded as a component of other comprehensive income. However, if a decline in fair value relative to cost is believed to be other than temporary, a loss is generally recorded on our statement of earnings. We also invest in equity securities which are subject to fluctuations in market value. In addition, significant portions of our assets (principally investments) and liabilities (principally loss and LAE reserves and unearned premiums) are exposed to changes in foreign currency exchange rates. The net change in the carrying value of assets and liabilities denominated in foreign currencies is generally recorded as a component of other comprehensive income.

The sensitivity analyses presented below provide only a limited, point-in-time view of the market risk of our financial instruments. The actual impact of changes in market interest rates, equity market prices and foreign currency exchange rates may differ significantly from those shown in these sensitivity analyses. The sensitivity analyses are further limited because they do not

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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 related to market issues such as liquidity and the credit worthiness of investments.

Interest Rate Risk

The primary market risk for our debt securities is interest rate risk at the time of refinancing. We monitor the interest rate environment to evaluate reinvestment and refinancing opportunities. We generally do not use derivatives to manage market and interest rate risks. The table below presents a sensitivity analysis as of March 31, 2020 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 March 31, 2020 ending prices based on yields adjusted to reflect a +/- 300 basis point range of change in interest rates, comparing these hypothetical ending prices to actual ending prices, and multiplying the difference by the par outstanding. The selected hypothetical changes in interest rates do not reflect what could be the potential best or worst case scenarios.

	-300		-200		-100		0		100			200			300
	($ in millions)
Assets:
Debt securities, fair value	$	15,319.8	$	14,614.2	$	13,955.3	$	13,337.8	$	12,737.6		$	12,168.1		$	11,637.2
Estimated change in fair value		1,982.0		1,276.4		617.5		—		(600.2	)		(1,169.7	)		(1,700.6	)
Liabilities:
Senior notes and other debt, fair value	$	2,098.5	$	1,932.7	$	1,793.0	$	1,674.8	$	1,574.0		$	1,487.7		$	1,413.7
Estimated change in fair value		423.7		257.9		118.2		—		(100.8	)		(187.1	)		(261.1	)

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 March 31, 2020 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 March 31, 2020
($ in millions)
Fair Value		Hypothetical Price Change	Estimated Fair Value After Hypothetical Change in Price		Hypothetical Percentage Increase (Decrease) in Stockholders' Equity
$	1,710.2	20% Increase	$	2,052.2		3.4%
		20% Decrease		1,368.2		(3.4%)

In addition to debt and equity securities, we invest in several partnerships which are subject to fluctuations in market value. Our partnership investments are included in other invested assets and are accounted for at fair value or using the equity method, and had a carrying value of $378.8 million as of March 31, 2020.

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Foreign Currency Exchange Rate Risk

Foreign currency exchange rate risk is the potential change in value arising from changes in foreign currency exchange rates. Our reinsurance operations located in foreign countries maintain some or all of their capital in their local currency and conduct business in their local currency, as well as the currencies of the other countries in which they operate. To mitigate this risk, we maintain investments denominated in certain foreign currencies in which the claims payments will be made. As of March 31, 2020, the largest foreign currency net liability exposures for these foreign operations were the Japanese Yen and Brazilian Real, and the largest foreign currency net asset exposures for these foreign operations was the Canadian 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 March 31, 2020 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 March 31, 2020
($ in millions)
Estimated Fair Value		Hypothetical Price Change	Estimated Fair Value After Hypothetical Change in Price	Hypothetical Percentage Increase (Decrease) in Stockholders' Equity
$(243.6)	(1)	20% Increase	($292.3)	(0.5%)
		20% Decrease	(194.9)	0.5%

(1) Denotes a net liability position as of March 31, 2020.

Item 4. Controls and Procedures.

Disclosure Controls and Procedures

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

Changes in Internal Control Over Financial Reporting

No changes occurred during the quarter ended March 31, 2020 in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Part II. OTHER INFORMATION

Item 1. Legal Proceedings.

Certain of our subsidiaries are parties to pending litigation and claims in connection with the ordinary course of their businesses. Each such subsidiary makes provisions for estimated losses to be incurred in such litigation and claims, including legal costs. We believe such provisions are adequate and do not believe that any pending litigation will have a material adverse effect on our consolidated results of operations, financial position or cash flows. See Note 12(a) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K.

Item 1A. Risk Factors.

There have been no material changes from the risk factors set forth in Part I, Item 1A, “Risk Factors” of the 2019 Form 10-K except as set forth below. The risk factors set forth below supplement, and should be read together with, that section for disclosures regarding what we believe are the more significant risks and uncertainties related to our businesses.

We expect that the impact of the COVID-19 global pandemic will continue to materially affect our businesses, results of operations, financial condition and liquidity. On March 11, 2020, the World Health Organization declared the global spread of a novel coronavirus (COVID-19) to be a pandemic and on March 12, 2020, the President of the United States declared the COVID-19 outbreak in the United States to be a national emergency. The COVID-19 global pandemic, or the “Pandemic,” and mitigation efforts by governments to attempt to control its spread have significantly impacted the global economy and our results of operations. We began to experience this impact in the first quarter 2020 and we expect it to continue to negatively affect our future results of operations. The duration and extent of the impact of the Pandemic on our business depends on future developments that cannot be accurately predicted at this time, such as the severity and transmission rate of the virus, the extent and effectiveness of containment actions and the impact of these and other factors on our employees, customers, suppliers and vendors. Given the scope and magnitude of the Pandemic, all of its direct and indirect consequences are not yet known and may not emerge for some time. The ongoing Pandemic presents risks and uncertainties to our operating businesses and investments, which could have a material adverse effect on our businesses, results of operations, financial condition and liquidity, including the following:

• Estimated Loss Reserves. The anticipated and unknown risks related to the Pandemic may cause additional uncertainty in the process of estimating loss reserves of our reinsurance and insurance subsidiaries. For example, the behavior of claimants and policyholders may change in unexpected ways (such as an increase in the number of fraudulent claims), we may see an increase in the number of claims for certain product lines, the disruption to the court system may impact the timing and amounts of claims settlements and the actions taken by governmental bodies, both legislative and regulatory, in reaction to the Pandemic and their related impacts are hard to predict. As a result, our estimated reserves may change.

• Revenues and Cash Flows. A prolonged economic downturn due to the Pandemic could result in a reduction in demand for our insurance and non-insurance products and services, which would negatively impact our revenues and cash flows. In addition, premium refunds or delayed receipt of premium payments, delayed payment of reinsurance recoverables and expedited claims payments in response to regulatory requirements as result of the Pandemic could have a negative impact on our revenues and cash flows.  

• Regulations, Orders and Proposed Legislation. Federal, state and local government actions to address and contain the impact of the Pandemic may adversely affect us. For example, we are subject to legislative and/or regulatory action that seeks to retroactively mandate coverage for losses that policies of our reinsurance and insurance company subsidiaries were not designed or priced to cover. Currently, in some states there is proposed legislation to require insurers to cover business interruption claims irrespective of terms, exclusions or other conditions included in the policies that would otherwise preclude coverage. Regulatory restrictions or requirements could also impact pricing, risk selection and our rights and obligations with respect to our policies and insureds, including our ability to cancel policies or our right to collect premiums. At least one state regulator has issued an order requiring insurers to issue premium refunds, and regulators in other states could take similar actions. It is also possible that changes in economic conditions and steps taken by federal, state and local governments in response to the Pandemic could require an increase in taxes at the federal, state and local levels, which would adversely impact our results of operations. In addition, we are a holding company and conduct our operations principally through our regulated reinsurance and insurance company subsidiaries.  We rely upon dividends and other permitted distributions from our regulated reinsurance and insurance company subsidiaries (including subsidiaries of AIHL and the TransRe holding company) as an important source of funds to meet our ongoing cash requirements, including our existing, and any future, debt service payments, and other expenses.  Our regulated reinsurance and insurance company subsidiaries are subject to various regulatory restrictions that limit the maximum amount of dividends available to be paid by them without prior approval of the

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relevant regulatory authorities.  In response to the Pandemic, it is possible that these regulatory restrictions may be increased which would decrease the amount of dividends we are permitted to receive from our regulated subsidiaries.

• Heightened Cybersecurity Risks. Having shifted to remote working arrangements in many of our locations, we face a heightened risk of cybersecurity attacks or data security incidents and are more dependent on internet and telecommunications access and capabilities.

• Investments in Debt Securities, Equity Securities and Other Invested Assets. The fair value of our investments in debt, equity securities and certain other invested assets fluctuates depending on general economic and market conditions. In the first quarter of 2020, the Pandemic had a significant negative impact on financial markets, and consequently the fair value of our equity and debt securities depreciated by $523.0 million and $364.6 million, respectively. Substantially all of the change in fair value of our debt securities was deemed temporary and was recorded as a component of other comprehensive income, but we did record an additional $31.4 million of losses through a credit allowance for available for sale debt securities. Due to the unprecedented nature of the Pandemic and related uncertainty, it is probable that financial markets, and by extension the value of our investment portfolio, will remain volatile until more clarity is available around the economic impact of the Pandemic. Prospectively, the sensitivity of the value of our investment portfolio relative to changes in broader financial markets can be approximated by the market beta of our equity holdings and the effective duration of our debt securities.  As of March 31, 2020, the market beta and effective duration of our equity and debt securities were 1.0 and 4.6 years, respectively. A market beta of 1.0 suggests that, over time, the portfolio is expected to move consistently with the stock market, and a duration of 4.6 years suggests that, for a 1% move in interest rates, the fixed income portfolio should appreciate or depreciate by 4.6%.

• Heightened Risks of Downgrades, Impairments and Defaults.  We are subject to the risk that the issuers of debt securities we own or borrowers on commercial mortgage loans we have invested in may become less credit worthy or default on principal and interest payments they owe us.  The longer and more severe the negative impact of the Pandemic, the more at risk our portfolio of investments in debt securities and commercial mortgage loans would be to credit downgrades, impairments and defaults. Exposures to industries and sectors most impacted by the shut-down of non-essential goods and services are at heightened risk of downgrades and other credit events.  These include all forms of exposures to hospitality, travel, retail, energy and consumer finance. The risks related to a prolonged shut-down are by no means limited to these sectors, but these are likely to be severely impacted. 

• Deflationary Economic Environment. In a deflationary scenario, economic conditions deteriorate as the value of a unit of currency in the future exceeds its value in the present. In addition to this dynamic reducing the incentive to borrow, which would hinder economic growth, it also makes servicing existing debts more onerous for issuers, which in turn increases the likelihood of credit downgrades, impairments and defaults.  Additionally, deflation generally is connected with lower interest rates which create challenges in generating sufficient levels of investment income.

• Oil and Gas Price Volatility. Market prices for oil and gas collapsed in the first quarter of 2020 as the combination of the Pandemic and geopolitical tensions among the world’s energy producers resulted in the simultaneous reduction of demand and increase in supply of crude.  The price shock has adversely affected the results, prospects and values of our investments in energy-related businesses, including Alleghany’s wholly-owned subsidiary Stranded Oil Resources Corporation, which businesses are likely to remain pressured until the uncertainty around the Pandemic and the price of energy products abates.

• Counterparty Credit Risk.  A prolonged economic downturn due to the Pandemic would increase our credit risk, reflecting our counterparty dealings with agents, brokers, customers, retrocessionaires, capital providers, and parties associated with our investment portfolio.  If one or more of these counterparties experience operational or financial failures as a result of the impacts from the spread of COVID-19, or claim that they cannot perform due to a force majeure, it could have a material adverse effect on our businesses, results of operations, financial condition and liquidity.

In addition, adverse impacts from the Pandemic may include further declines in our equity securities portfolio, additional credit-related realized and unrealized losses on our debt securities and commercial mortgage portfolios, additional credit losses on our reinsurance recoverables and other receivables, further losses from event cancellation and other coverages from our reinsurance and insurance subsidiaries, negative impact to revenues and earnings of certain Alleghany Capital subsidiaries, and impairment of certain Alleghany Capital subsidiary goodwill and intangible assets. As a result of any one or a combination of the risks identified above, the Pandemic could have a material adverse effect on our businesses, results of operations, financial condition and liquidity.

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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 March 31, 2020:

	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)
January 1 to January 31		13,067	$	802.97		13,067	$	616.6
February 1 to February 29		18,522		755.55		18,522		602.6
March 1 to March 31		30,951		639.12		30,951		582.9
Total		62,540		707.84		62,540

(1) In June 2018, our Board of Directors authorized the repurchase of shares of our common stock, at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million. In September 2019, our Board of Directors authorized, upon the completion of the previously announced program, the repurchase of additional shares of our common stock at such times and at prices as management determines to be advisable, up to an aggregate of $500.0 million.

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Item 6. Exhibits.

Exhibit  Number	Description
31.1	Certification of the Chief Executive Officer of the Company pursuant to Rule 13a-14(a) or Rule 15(d)-14(a) of the Exchange Act.
31.2	Certification of the Chief Financial Officer of the Company pursuant to Rule 13a-14(a) or Rule 15(d)-14(a) of the Exchange Act.
32.1	Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section  906 of the Sarbanes-Oxley Act of 2002. This exhibit shall not be deemed “filed” as a part of this Form 10-Q.
32.2	Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section  906 of the Sarbanes-Oxley Act of 2002. This exhibit shall not be deemed “filed” as a part of this Form 10-Q.
101	Interactive Data Files formatted in Inline XBRL (eXtensible Business Reporting Language): (i) Consolidated Balance Sheets as of March 31, 2020 and December 31, 2019; (ii) Consolidated Statements of Earnings and Comprehensive Income for the three months ended March 31, 2020 and 2019; (iii) Consolidated Statements of Changes in Stockholders’ Equity for the three months ended March 31, 2020 and 2019; (iv) Consolidated Statements of Cash Flows for the three months ended March 31, 2020 and 2019; and (v) Notes to Unaudited Consolidated Financial Statements.
104	Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101).

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SIGNATURES

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

	ALLEGHANY CORPORATION
	(Registrant)
Date: May 5, 2020	By:	/s/ Kerry J. Jacobs
		Kerry J. Jacobs
		Senior Vice President and chief financial officer
		(principal financial officer)

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EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

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

I, Weston M. Hicks, certify that:

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

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

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

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

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

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

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

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

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

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

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

Date: May 5, 2020

/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, Kerry J. Jacobs, 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: May 5, 2020

/s/ Kerry J. Jacobs

Kerry J. Jacobs

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 March 31, 2020, 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: May 5, 2020	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 March 31, 2020, as filed with the Securities and Exchange Commission (the “Report”), I, Kerry J. Jacobs, 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: May 5, 2020	By:	/s/ Kerry J. Jacobs
		Kerry J. Jacobs
		Senior Vice President and chief financial officer

XML

Carrying Values and Estimated Fair Values of Consolidated Financial Instruments (Detail) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Assets
Investments (excluding equity method investments and loans)	[1]	$ 15,584.6	$ 17,632.3
Liabilities
Senior notes and other debt	[2]	1,674.8	1,962.7
Carrying Value
Assets
Investments (excluding equity method investments and loans)	[1]	15,584.6	17,632.3
Liabilities
Senior notes and other debt	[2]	$ 1,514.4	$ 1,751.1

[1] This table includes debt and equity securities, as well as partnership and non-marketable equity investments accounted for 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 accounted for at unpaid principal balance. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is disclosed below.

[2] See Note 11 of this Form 10-Q for additional information on the senior notes and other debt.

XML

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Stockholders Equity Note [Abstract]

Schedule of Common Stock Repurchases

The following table presents the shares of Common Stock that Alleghany repurchased in the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020		2019
Shares repurchased		62,540		129,567
Cost of shares repurchased (in millions)	$	44.3	$	80.5
Average price per share repurchased	$	707.84	$	621.19

Reconciliation of Accumulated Other Comprehensive Income (Loss)

The following tables present a reconciliation of the changes during the three months ended March 31, 2020 and 2019 in accumulated other comprehensive income (loss) attributable to Alleghany stockholders:

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2020	$	321.0		$	(121.8	)	$	(27.9	)	$	171.3
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		(276.6	)		(13.7	)		0.5			(289.8	)
Reclassifications from accumulated other comprehensive income		(10.9	)		—			—			(10.9	)
Total		(287.5	)		(13.7	)		0.5			(300.7	)
Balance as of March 31, 2020	$	33.5		$	(135.5	)	$	(27.4	)	$	(129.4	)

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2019	$	(61.6	)	$	(124.7	)	$	(15.7	)	$	(202.0	)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		183.4			(0.9	)		0.9			183.4
Reclassifications from accumulated other comprehensive income		4.4			—			—			4.4
Total		187.8			(0.9	)		0.9			187.8
Balance as of March 31, 2019	$	126.2		$	(125.6	)	$	(14.8	)	$	(14.2	)

Reclassifications of Accumulated Other Comprehensive Income (Loss)

The following table presents reclassifications out of accumulated other comprehensive income (loss) attributable to Alleghany stockholders during the three months ended March 31, 2020 and 2019:

Accumulated Other		Three Months Ended March 31,
Comprehensive Income Component	Line in Consolidated Statement of Earnings	2020			2019
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(45.1	)	$	(4.4	)
	Credit losses for available for sale securities		31.4			10.0
	Income taxes		2.8			(1.2	)
Total reclassifications:	Net (earnings) losses	$	(10.9	)	$	4.4

(1) For the three months ended March 31, 2020, excludes a $7.1 million realized loss as a result of an early redemption of debt (see Note 11(a) of this Form 10-Q for further information), a $30.0 million impairment charge from a write-down of certain SORC assets and a $5.0 million realized gain from a reduction of certain contingent consideration liabilities (see Note 3(e) of this Form 10-Q for additional information).

XML

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

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 March 31, 2020 and December 31, 2019:

	March 31, 2020				December 31, 2019
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	15,584.6	$	15,584.6	$	17,632.3	$	17,632.3
Liabilities
Senior notes and other debt(2)	$	1,514.4	$	1,674.8	$	1,751.1	$	1,962.7

(1) This table includes debt and equity securities, as well as partnership and non-marketable equity investments accounted for 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 accounted for at unpaid principal balance. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is disclosed below.

(2) See Note 11 of this Form 10-Q 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 March 31, 2020 and December 31, 2019:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of March 31, 2020
Equity securities:
Common stock	$	1,702.6	$	3.5	$	—	$	1,706.1
Preferred stock		—		2.1		2.0		4.1
Total equity securities		1,702.6		5.6		2.0		1,710.2
Debt securities:
U.S. Government obligations		—		846.3		—		846.3
Municipal bonds		—		2,272.6		—		2,272.6
Foreign government obligations		—		696.0		—		696.0
U.S. corporate bonds		—		2,805.2		589.5		3,394.7
Foreign corporate bonds		—		1,125.9		164.7		1,290.6
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		—		1,697.4		2.5		1,699.9
Commercial mortgage-backed securities (“CMBS”)		—		838.1		4.5		842.6
Other asset-backed securities(2)		—		1,548.4		746.7		2,295.1
Total debt securities(3)		—		11,829.9		1,507.9		13,337.8
Short-term investments		—		536.1		—		536.1
Other invested assets(4)		—		—		0.5		0.5
Total investments (excluding equity method investments and loans)	$	1,702.6	$	12,371.6	$	1,510.4	$	15,584.6
Senior notes and other debt	$	—	$	1,245.0	$	429.8	$	1,674.8

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2019
Equity securities:
Common stock	$	2,498.1	$	3.3	$	—	$	2,501.4
Preferred stock		—		2.1		2.0		4.1
Total equity securities		2,498.1		5.4		2.0		2,505.5
Debt securities:
U.S. Government obligations		—		1,215.0		—		1,215.0
Municipal bonds		—		2,307.9		—		2,307.9
Foreign government obligations		—		690.7		—		690.7
U.S. corporate bonds		—		2,754.0		605.0		3,359.0
Foreign corporate bonds		—		1,208.7		168.7		1,377.4
Mortgage and asset-backed securities:
RMBS(1)		—		1,838.5		1.9		1,840.4
CMBS		—		865.9		5.8		871.7
Other asset-backed securities(2)		—		1,692.9		856.7		2,549.6
Total debt securities		—		12,573.6		1,638.1		14,211.7
Short-term investments		—		914.8		—		914.8
Other invested assets(4)		—		—		0.3		0.3
Total investments (excluding equity method investments and loans)	$	2,498.1	$	13,493.8	$	1,640.4	$	17,632.3
Senior notes and other debt	$	—	$	1,595.6	$	367.1	$	1,962.7

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

(2) Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

(3) Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

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

Reconciliations of Changes in Level Three Assets Measured at Fair Value

The following tables present reconciliations of the changes in Level 3 assets during the three months ended March 31, 2020 and 2019 measured at fair value:

			Debt Securities
									Mortgage and asset-backed
Three Months Ended March 31, 2020	Preferred Stock		U.S. Corporate Bonds			Foreign Corporate Bonds			RMBS			CMBS			Other Asset- backed Securities			Other Invested Assets(1)		Total
	($ in millions)
Balance as of January 1, 2020	$	2.0	$	605.0		$	168.7		$	1.9		$	5.8		$	856.7		$	0.3	$	1,640.4
Net realized/unrealized gains (losses) included in:
Net earnings (losses)(2)		—		0.2			—			—			—			(0.1	)		—		0.1
Other comprehensive income (loss)		—		(18.8	)		(7.3	)		(0.2	)		(1.3	)		(101.4	)		0.2		(128.8	)
Purchases		—		6.7			7.7			0.9			—			43.6			—		58.9
Sales		—		—			—			—			—			(8.3	)		—		(8.3	)
Issuances		—		—			—			—			—			—			—		—
Settlements		—		(3.6	)		(1.1	)		(0.1	)		—			(32.4	)		—		(37.2	)
Transfers into Level 3		—		—			—			—			—			—			—		—
Transfers out of Level 3		—		—			(3.3	)		—			—			(11.4	)		—		(14.7	)
Balance as of March 31, 2020	$	2.0	$	589.5		$	164.7		$	2.5		$	4.5		$	746.7		$	0.5	$	1,510.4

				Debt Securities
										Mortgage and asset-backed
Three Months Ended March 31, 2019	Preferred Stock			U.S. Corporate Bonds			Foreign Corporate Bonds			CMBS		Other Asset- backed Securities			Other Invested Assets(1)			Total
	($ in millions)
Balance as of January 1, 2019	$	5.4		$	425.7		$	126.9		$	—	$	1,266.9		$	0.7		$	1,825.6
Net realized/unrealized gains (losses) included in:
Net (losses)(2)		—			(9.9	)		—			—		—			—			(9.9	)
Other comprehensive income (loss)		(0.8	)		15.7			2.6			—		15.2			(0.2	)		32.5
Purchases		—			5.8			13.8			0.2		49.6			—			69.4
Sales		—			—			(5.6	)		—		(116.9	)		—			(122.5	)
Issuances		—			—			—			—		—			—			—
Settlements		—			(2.6	)		(1.0	)		—		(35.8	)		—			(39.4	)
Transfers into Level 3		—			—			14.7			—		—			—			14.7
Transfers out of Level 3		—			(1.0	)		—			—		—			—			(1.0	)
Balance as of March 31, 2019	$	4.6		$	433.7		$	151.4		$	0.2	$	1,179.0		$	0.5		$	1,769.4

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

(2) There were no credit losses recorded in net earnings related to Level 3 assets still held as of March 31, 2020 and 2019.

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Summary of Alleghany Capital Non-Insurance Revenue (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Other Revenues [Line Items]
Noninsurance revenue		$ 467,849	$ 514,123
Operating Segments
Other Revenues [Line Items]
Noninsurance revenue		464,700	510,400
Operating Segments | Alleghany Capital Corporation Segment
Other Revenues [Line Items]
Noninsurance revenue		457,300	505,000
Operating Segments | Alleghany Capital Corporation Segment | Industrial Segment
Other Revenues [Line Items]
Noninsurance revenue	[1]	242,500	260,100
Operating Segments | Alleghany Capital Corporation Segment | Non-industrial Segment
Other Revenues [Line Items]
Noninsurance revenue	[2]	214,700	$ 244,900
Operating Segments | Alleghany Capital Corporation Segment | Corporate & Other
Other Revenues [Line Items]
Noninsurance revenue		$ 100

[1] For the three months ended March 31, 2020 and 2019, the vast majority of noninsurance revenue was recognized as goods and services transferred to customers over time.

[2] For the three months ended March 31, 2020 and 2019, approximately 82 percent 66 percent, respectively, of noninsurance revenue was recognized as services transferred to customers over time, with the remainder recognized as goods transferred at a point in time.

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Amounts of Gross Realized Capital Gains and Gross Realized Capital Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Investments Debt And Equity Securities [Abstract]
Gross realized capital gains	$ 59,000	$ 12,100
Gross realized capital losses	(46,000)	(7,700)
Net realized capital gains	$ 13,026	$ 4,442

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Gross Unrealized Losses and Related Fair Values for AFS Securities for which an Allowance for Credit Losses has Not Been Recorded Grouped by Duration of Time in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	$ 3,875.2	$ 1,333.2
Securities, less than 12 months, gross unrealized losses	288.5	12.8
Securities, 12 months or more, fair value	513.0	998.0
Securities, 12 months or more, gross unrealized losses	87.3	20.0
Total, fair value	4,388.2	2,331.2
Total, gross unrealized losses	375.8	32.8
U.S. Government obligations
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	8.7	120.3
Securities, less than 12 months, gross unrealized losses	0.2	2.0
Securities, 12 months or more, fair value		99.7
Securities, 12 months or more, gross unrealized losses		0.8
Total, fair value	8.7	220.0
Total, gross unrealized losses	0.2	2.8
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	129.4	90.2
Securities, less than 12 months, gross unrealized losses	2.9	1.3
Securities, 12 months or more, fair value	0.1	4.3
Total, fair value	129.5	94.5
Total, gross unrealized losses	2.9	1.3
Foreign government obligations
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	76.5	198.5
Securities, less than 12 months, gross unrealized losses	0.7	1.2
Securities, 12 months or more, fair value		33.8
Securities, 12 months or more, gross unrealized losses		0.4
Total, fair value	76.5	232.3
Total, gross unrealized losses	0.7	1.6
U.S. corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	1,023.5	113.8
Securities, less than 12 months, gross unrealized losses	68.5	1.6
Securities, 12 months or more, fair value	3.6	27.6
Securities, 12 months or more, gross unrealized losses	0.6	0.7
Total, fair value	1,027.1	141.4
Total, gross unrealized losses	69.1	2.3
Foreign corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	656.5	212.0
Securities, less than 12 months, gross unrealized losses	32.6	2.3
Securities, 12 months or more, fair value	17.4	66.9
Securities, 12 months or more, gross unrealized losses	0.1	0.6
Total, fair value	673.9	278.9
Total, gross unrealized losses	32.7	2.9
RMBS
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	15.2	48.7
Securities, less than 12 months, gross unrealized losses	0.2	0.3
Securities, 12 months or more, fair value	0.4	48.6
Securities, 12 months or more, gross unrealized losses		0.5
Total, fair value	15.6	97.3
Total, gross unrealized losses	0.2	0.8
CMBS
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	436.4	126.8
Securities, less than 12 months, gross unrealized losses	43.9	1.4
Securities, 12 months or more, fair value	0.2	1.2
Total, fair value	436.6	128.0
Total, gross unrealized losses	43.9	1.4
Other asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securities, less than 12 months, fair value	1,529.0	422.9
Securities, less than 12 months, gross unrealized losses	139.5	2.7
Securities, 12 months or more, fair value	491.3	715.9
Securities, 12 months or more, gross unrealized losses	86.6	17.0
Total, fair value	2,020.3	1,138.8
Total, gross unrealized losses	$ 226.1	$ 19.7

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Information Regarding Concentration of Reinsurance Recoverables and The Ratings Profile of Our Reinsurers (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses		$ 1,635,400	$ 1,682,000
Allowance for credit losses		(6,800)
Reinsurance recoverables		1,628,649	$ 1,681,962
Reinsurance Recoverable | Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[1],[2]	$ 1,635,400
Reinsurance recoverable as percentage of total reinsurance recoverables	[1],[2]	100.00%
Allowance for credit losses	[2]	$ (6,800)
Reinsurance recoverables	[2]	$ 1,628,600
Reinsurance Recoverable | Reinsurer Concentration Risk | Ceded Credit Risk, Secured
Ceded Credit Risk [Line Items]
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[3]	40.30%
Reinsurance recoverables	[2],[3]	$ 659,600
Reinsurance Recoverable | Reinsurer Concentration Risk | All other reinsurers
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2]	$ 741,400
Reinsurance recoverable as percentage of total reinsurance recoverables	[2]	45.50%
AM Best, A Rating | Reinsurance Recoverable | Reinsurer Concentration Risk | Syndicates at Lloyd's of London
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[4]	$ 132,900
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[4]	8.10%
AM Best, A Rating | Reinsurance Recoverable | Reinsurer Concentration Risk | PartnerRe Limited
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[4]	$ 97,400
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[4]	6.00%
AM Best, A Rating | Reinsurance Recoverable | Reinsurer Concentration Risk | Fairfax Financial Holdings Limited
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[4]	$ 90,400
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[4]	5.50%
AM Best, A Rating | Reinsurance Recoverable | Reinsurer Concentration Risk | Liberty Mutual
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[4]	$ 55,900
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[4]	3.40%
Not Rated | Reinsurance Recoverable | Reinsurer Concentration Risk | Kane SAC Ltd, Rondout Segregated Account
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[3],[4]	$ 121,800
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[3],[4]	7.40%
Not Rated | Reinsurance Recoverable | Reinsurer Concentration Risk | Kane SAC Ltd, Bowery Segregated Account
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[3],[4]	$ 77,400
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[3],[4]	4.70%
AM Best, A+ Rating | Reinsurance Recoverable | Reinsurer Concentration Risk | Swiss Reinsurance Company
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[4]	$ 88,100
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[4]	5.40%
AM Best, A+ Rating | Reinsurance Recoverable | Reinsurer Concentration Risk | RenaissanceRe Holdings Ltd
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[4]	$ 75,400
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[4]	4.60%
AM Best, A+ Rating | Reinsurance Recoverable | Reinsurer Concentration Risk | W.R. Berkley Corporation
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[4]	$ 67,700
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[4]	4.10%
AM Best, A- Rating | Reinsurance Recoverable | Reinsurer Concentration Risk | Third Point Reinsurance Group
Ceded Credit Risk [Line Items]
Reinsurance recoverables, before allowance for credit losses	[2],[4]	$ 87,000
Reinsurance recoverable as percentage of total reinsurance recoverables	[2],[4]	5.30%

[1] Approximately 66 percent of our reinsurance recoverables balance as of March 31, 2020 was due from reinsurers having an A.M. Best Company, Inc. financial strength rating of A (Excellent) or higher, with a majority of the other reinsurance recoverables being secured by funds held, trust agreements or letters of credit.

[2] Reinsurance recoverables reflect amounts due from one or more reinsurance subsidiaries of the listed company.

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

[4] Represents the A.M. Best Company, Inc. financial strength rating for the applicable reinsurance subsidiary or subsidiaries from which the reinsurance recoverable is due.

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Reconciliation of Earnings and Share Data used in Basic and Diluted Earnings per Share Computations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net earnings available to Alleghany stockholders		$ (361,218)	$ 440,227
Effect of dilutive securities		(3,000)
Income available to common stockholders for diluted earnings per share		$ (364,200)	$ 440,200
Weighted average common shares outstanding applicable to basic earnings per share		14,340,669	14,481,255
Effect of dilutive securities		15,439	3,981
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		14,356,108	14,485,236
Contingently issuable shares	[1]	18,703	39,325

[1] Contingently issuable shares were potentially available in the periods presented, but were not included in the diluted earnings per share computations because the impact was anti-dilutive to the earnings per share calculation.

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Schedule of Common Stock Repurchases (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stockholders Equity Note [Abstract]
Shares repurchased	62,540	129,567
Cost of shares repurchased	$ 44,268	$ 80,486
Average price per share repurchased	$ 707.84	$ 621.19

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Activity in the Liability for Loss and Loss Adjustment Expense (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Activity in liability for loss and loss adjustment expense
Reserves as of January 1		$ 11,928,359	$ 12,250,300
Less: reinsurance recoverables	[1]	1,583,900	1,857,400
Net reserves as of January 1		10,344,500	10,392,900
Other adjustments			(200)
Incurred loss and LAE, net of reinsurance, related to:
Current year		1,086,400	829,900
Prior years		(59,000)	(37,400)
Total incurred loss and LAE, net of reinsurance		1,027,444	792,498
Paid loss and LAE, net of reinsurance, related to:
Current year	[2]	87,300	75,300
Prior years	[2]	770,200	914,800
Total paid loss and LAE, net of reinsurance	[2]	857,500	990,100
Foreign currency exchange rate effect		(7,500)	17,200
Net reserves as of March 31		10,506,900	10,212,300
Reinsurance recoverables as of March 31	[1]	1,559,500	1,642,800
Reserves as of March 31		$ 12,066,438	$ 11,855,100

[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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Financial Instruments Measured at Fair Value and Level of Fair Value Hierarchy of Inputs (Detail) - USD ($) $ in Thousands		Mar. 31, 2020		Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		$ 1,710,193		$ 2,505,496
Estimated fair value of available for sale debt securities		13,337,754	[1]	14,211,745
Estimated fair value of investments (excluding equity method investments and loans)	[2]	15,584,600		17,632,300
Senior notes and other debt	[3]	1,674,800		1,962,700
Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		1,706,100		2,501,400
Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		4,100		4,100
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		846,300		1,215,000
Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		2,272,600		2,307,900
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		696,000		690,700
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		3,394,700		3,359,000
Foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		1,290,600		1,377,400
RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[4]	1,699,900		1,840,400
CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		842,600		871,700
Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[5]	2,295,100		2,549,600
Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of investments (excluding equity method investments and loans)		536,100		914,800
Other invested assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of investments (excluding equity method investments and loans)	[6]	500		300
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		1,702,600		2,498,100
Estimated fair value of investments (excluding equity method investments and loans)		1,702,600		2,498,100
Level 1 | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		1,702,600		2,498,100
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		5,600		5,400
Estimated fair value of available for sale debt securities		11,829,900	[1]	12,573,600
Estimated fair value of investments (excluding equity method investments and loans)		12,371,600		13,493,800
Senior notes and other debt		1,245,000		1,595,600
Level 2 | Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		3,500		3,300
Level 2 | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		2,100		2,100
Level 2 | U.S. Government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		846,300		1,215,000
Level 2 | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		2,272,600		2,307,900
Level 2 | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		696,000		690,700
Level 2 | U.S. corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		2,805,200		2,754,000
Level 2 | Foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		1,125,900		1,208,700
Level 2 | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[4]	1,697,400		1,838,500
Level 2 | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		838,100		865,900
Level 2 | Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[5]	1,548,400		1,692,900
Level 2 | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of investments (excluding equity method investments and loans)		536,100		914,800
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		2,000		2,000
Estimated fair value of available for sale debt securities		1,507,900	[1]	1,638,100
Estimated fair value of investments (excluding equity method investments and loans)		1,510,400		1,640,400
Senior notes and other debt		429,800		367,100
Level 3 | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of equities		2,000		2,000
Level 3 | U.S. corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		589,500		605,000
Level 3 | Foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		164,700		168,700
Level 3 | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[4]	2,500		1,900
Level 3 | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		4,500		5,800
Level 3 | Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities	[5]	746,700		856,700
Level 3 | Other invested assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of investments (excluding equity method investments and loans)	[6]	$ 500		$ 300

[1] Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

[2] This table includes debt and equity securities, as well as partnership and non-marketable equity investments accounted for 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 accounted for at unpaid principal balance. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is disclosed below.

[3] See Note 11 of this Form 10-Q for additional information on the senior notes and other debt.

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

[5] Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

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

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Amortized Cost and Fair Value of Available For Sale Securities (Detail) - USD ($) $ in Thousands		Mar. 31, 2020		Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		$ 13,320,808		$ 13,798,576
Debt securities, gross unrealized gains		424,200		445,800
Debt securities, gross unrealized losses		(375,800)		(32,800)
Debt securities, allowance for credit losses	[1]	(31,375)
Debt securities, fair value		13,337,754	[2]	14,211,745
Amortized Cost or Cost		13,856,900		14,713,500
Gross Unrealized Gains		424,200		445,800
Gross Unrealized Losses		(375,800)		(32,800)
Allowance for Credit Losses	[1]	(31,400)
Fair Value		13,873,900		15,126,500
U.S. Government obligations
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		793,500		1,198,500
Debt securities, gross unrealized gains		53,000		19,300
Debt securities, gross unrealized losses		(200)		(2,800)
Debt securities, fair value		846,300		1,215,000
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		2,158,300		2,190,500
Debt securities, gross unrealized gains		117,200		118,700
Debt securities, gross unrealized losses		(2,900)		(1,300)
Debt securities, fair value		2,272,600		2,307,900
Foreign government obligations
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		669,100		675,900
Debt securities, gross unrealized gains		27,600		16,400
Debt securities, gross unrealized losses		(700)		(1,600)
Debt securities, fair value		696,000		690,700
U.S. corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		3,386,800		3,206,200
Debt securities, gross unrealized gains		103,500		155,100
Debt securities, gross unrealized losses		(69,100)		(2,300)
Debt securities, allowance for credit losses	[1]	(26,500)
Debt securities, fair value		3,394,700		3,359,000
Foreign corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		1,311,200		1,348,100
Debt securities, gross unrealized gains		14,500		32,200
Debt securities, gross unrealized losses		(32,700)		(2,900)
Debt securities, allowance for credit losses	[1]	(2,400)
Debt securities, fair value		1,290,600		1,377,400
RMBS
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		1,613,700		1,785,100
Debt securities, gross unrealized gains		86,900		56,100
Debt securities, gross unrealized losses		(200)		(800)
Debt securities, allowance for credit losses	[1]	(500)
Debt securities, fair value	[3]	1,699,900		1,840,400
CMBS
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		870,600		849,900
Debt securities, gross unrealized gains		15,900		23,200
Debt securities, gross unrealized losses		(43,900)		(1,400)
Debt securities, fair value		842,600		871,700
Other Asset Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, amortized cost		2,517,600		2,544,500
Debt securities, gross unrealized gains		5,600		24,800
Debt securities, gross unrealized losses		(226,100)		(19,700)
Debt securities, allowance for credit losses	[1]	(2,000)
Debt securities, fair value	[4]	2,295,100		2,549,600
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost or Cost		536,100		914,800
Fair Value		$ 536,100		$ 914,800

[1] See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

[2] Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

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

[4] Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

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Summary of Changes in Fair Value of Equity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Equity Securities Fv Ni Gain Loss [Abstract]
Change in the fair value of equity securities sold during the period	$ (164,900)	$ 62,100
Change in the fair value of equity securities held at the end of the period	(358,100)	330,300
Change in the fair value of equity securities	$ (522,976)	$ 392,353

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

9. Commitments and Contingencies

(a) General

The ongoing COVID-19 global pandemic (the “Pandemic”) has significantly disrupted many aspects of society as well as financial markets, and has caused widespread global economic dislocation. Alleghany cannot reasonably estimate the duration or severity of the Pandemic, or the extent to which the related disruption may adversely impact its results of operations, financial position and cash flows, or those of its subsidiaries. Adverse impacts from the Pandemic in future periods may include realized and unrealized losses in Alleghany’s investment portfolio and receivables, as well as impairment losses on certain subsidiary goodwill and intangible assets.

Certain of Alleghany’s subsidiaries are parties to pending litigation and claims in connection with the ordinary course of their businesses. Each such subsidiary makes provisions for estimated losses to be incurred in such litigation and claims, including legal costs. In the opinion of management, such provisions are adequate, and management does not believe that any pending litigation will have a material adverse effect on Alleghany’s consolidated results of operations, financial position or cash flows.

(b) Leases

Alleghany and its subsidiaries lease certain facilities, land, furniture and equipment under long-term, non-cancelable lease agreements that expire at various dates in future years. Most of Alleghany’s leases relate to office facilities. Alleghany’s lease agreements do not contain any material restrictive covenants and substantially all are considered to be operating leases. 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 2019 Form 10-K.

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Liability for Loss and LAE

3 Months Ended

Mar. 31, 2020

Insurance [Abstract]

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 for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Reserves as of January 1	$	11,928.4		$	12,250.3
Less: reinsurance recoverables(1)		1,583.9			1,857.4
Net reserves as of January 1		10,344.5			10,392.9
Other adjustments		—			(0.2	)
Incurred loss and LAE, net of reinsurance, related to:
Current year		1,086.4			829.9
Prior years		(59.0	)		(37.4	)
Total incurred loss and LAE, net of reinsurance		1,027.4			792.5
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		87.3			75.3
Prior years		770.2			914.8
Total paid loss and LAE, net of reinsurance		857.5			990.1
Foreign currency exchange rate effect		(7.5	)		17.2
Net reserves as of March 31		10,506.9			10,212.3
Reinsurance recoverables as of March 31(1)		1,559.5			1,642.8
Reserves as of March 31	$	12,066.4		$	11,855.1

(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 as of March 31, 2020 increased from December 31, 2019, primarily reflecting the impact of growing net premiums earned and catastrophe losses incurred in the first three months of 2020, partially offset by payments on catastrophe losses incurred in 2017, 2018 and 2019 and favorable prior accident year loss reserve development.  

(b) Liability Development

The following table presents the (favorable) unfavorable prior accident year loss reserve development for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020				2019
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	(32.3	)	(1)	$	8.4		(2)
Non-catastrophe		(14.4	)	(3)		(19.1	)	(4)
Total		(46.7	)			(10.7	)
Casualty & other:
Malpractice Treaties(5)		—				—
Other		(11.0	)	(6)		(25.7	)	(7)
Total		(11.0	)			(25.7	)
Total Reinsurance Segment		(57.7	)			(36.4	)
Insurance Segment
RSUI:
Casualty		(1.0	)	(8)		(5.6	)	(9)
Property and other		(0.5	)	(10)		1.9		(11)
Total		(1.5	)			(3.7	)
CapSpecialty		0.2		(12)		2.7		(12)
Total incurred related to prior years	$	(59.0	)		$	(37.4	)

(1) Primarily reflects favorable prior accident year loss reserve development related to Typhoon Hagibis in the 2019 accident year and catastrophes in the 2018 accident year.

(2) Primarily reflects unfavorable prior accident year loss reserve development related to Typhoon Jebi in the 2018 accident year, partially offset by favorable prior accident year loss reserve development related to the wildfires in California in the 2018 accident year.

(3) Primarily reflects favorable prior accident year loss reserve development in the 2017 and 2019 accident years.

(4) Primarily reflects favorable prior accident year loss reserve development in the 2016 through 2018 accident years.

(5) Represents certain 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) Primarily reflects favorable prior accident year loss reserve development in the longer-tailed lines of business in the 2013 and earlier accident years, partially offset by unfavorable prior accident year development in the shorter-tailed lines of business in the 2014 through 2019 accident years.

(7) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed lines of business in the 2012 through 2017 prior accident years and in the professional liability lines of business in the 2007 and prior accident years.

(8) Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in recent accident years.

(9) Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in the 2017 accident year.

(10) Primarily reflects favorable prior accident year loss reserve development related to catastrophes in the 2018 accident year, partially offset by unfavorable prior accident year loss reserve development related to catastrophes in the 2017 accident year.

(11) Primarily reflects unfavorable prior accident year loss reserve development related to Hurricanes Harvey in the 2017 accident year and Florence in the 2018 accident year.

(12) Primarily reflects unfavorable prior accident year loss reserve development in certain specialty lines of business written through a program administrator in connection with a terminated program in the 2009 and 2010 accident years.

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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Contributed Capital	Accumulated Other Comprehensive Income (loss)	Treasury Stock	Retained Earnings
Beginning Balance at Dec. 31, 2018	$ 7,692,710	$ 17,460	$ 3,612,830	$ (202,003)	$ (1,312,939)	$ 5,577,362
Net (losses) earnings	440,227					440,227
Other comprehensive income (loss), net of tax:
Retirement plans	937			937
Change in unrealized appreciation of investments, net	187,794			187,794
Change in unrealized currency translation adjustment, net	(885)			(885)
Comprehensive (loss) income attributable to Alleghany stockholders	628,073			187,846		440,227
Treasury stock repurchase	(80,486)				(80,486)
Other, net	(3,810)		(4,176)		366
Ending Balance at Mar. 31, 2019	8,236,487	17,460	3,608,654	(14,157)	(1,393,059)	6,017,589
Redeemable noncontrolling interests balance at Dec. 31, 2018	169,762
Redeemable Non-controlling Interests
Net (losses) earnings attributable to redeemable noncontrolling interests	7,675
Comprehensive (loss) income attributable to noncontrolling interests	7,675
Other net changes to redeemable noncontrolling interests	(1,716)
Redeemable noncontrolling interests balance at Mar. 31, 2019	175,721
Beginning Balance at Dec. 31, 2019	8,776,734	17,460	3,608,638	171,350	(1,455,877)	6,435,163
Cumulative effect of adoption of new accounting pronouncements at Dec. 31, 2019	(3,570)					(3,570)
Net (losses) earnings	(361,218)					(361,218)
Other comprehensive income (loss), net of tax:
Retirement plans	517			517
Change in unrealized appreciation of investments, net	(287,477)			(287,477)
Change in unrealized currency translation adjustment, net	(13,733)			(13,733)
Comprehensive (loss) income attributable to Alleghany stockholders	(661,911)			(300,693)		(361,218)
Dividends paid	(215,013)					(215,013)
Treasury stock repurchase	(44,268)				(44,268)
Other, net	5,090		1,499		3,591
Ending Balance at Mar. 31, 2020	7,857,062	$ 17,460	$ 3,610,137	$ (129,343)	$ (1,496,554)	$ 5,855,362
Redeemable noncontrolling interests balance at Dec. 31, 2019	204,753
Redeemable Non-controlling Interests
Net (losses) earnings attributable to redeemable noncontrolling interests	(254)
Comprehensive (loss) income attributable to noncontrolling interests	(254)
Other net changes to redeemable noncontrolling interests	3,862
Redeemable noncontrolling interests balance at Mar. 31, 2020	$ 208,361

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Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020		Dec. 31, 2019
Investments:
Equity securities	$ 1,710,193		$ 2,505,496
Debt securities	13,337,754	[1]	14,211,745
Short-term investments	536,105		914,776
Marketable Securities, Total	15,584,052		17,632,017
Commercial mortgage loans	682,655		686,206
Other invested assets	541,512		573,605
Total investments	16,808,219		18,891,828
Cash	1,555,185		1,179,098
Accrued investment income	94,301		96,516
Premium balances receivable	1,091,980		948,010
Reinsurance recoverables	1,628,649		1,681,962
Ceded unearned premiums	266,173		248,153
Deferred acquisition costs	541,040		522,577
Property and equipment at cost, net of accumulated depreciation and amortization	208,300		205,397
Goodwill	530,228		523,021
Intangible assets, net of amortization	688,233		685,953
Current taxes receivable	30,791		4,081
Net deferred tax assets	189,814		5,860
Funds held under reinsurance agreements	779,272		755,515
Other assets	1,340,756		1,183,633
Total assets	25,752,941		26,931,604
Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity
Loss and loss adjustment expenses	12,066,438		11,928,359
Unearned premiums	2,668,409		2,566,170
Senior notes and other debt	1,514,381		1,751,113
Reinsurance payable	184,779		188,399
Other liabilities	1,253,511		1,516,076
Total liabilities	17,687,518		17,950,117
Redeemable noncontrolling interests	208,361		204,753
Common stock	17,460		17,460
Contributed capital	3,610,137		3,608,638
Accumulated other comprehensive income (loss)	(129,343)		171,350
Treasury stock	(1,496,554)		(1,455,877)
Retained earnings	5,855,362		6,435,163
Total stockholders’ equity attributable to Alleghany stockholders	7,857,062		8,776,734
Total liabilities, redeemable noncontrolling interests and stockholders’ equity	$ 25,752,941		$ 26,931,604

[1] Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

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Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended
	Mar. 15, 2020	Feb. 29, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2018
Stockholders Equity Note [Line Items]
Remaining authorized repurchases under share repurchase program			$ 582,900,000
Par value of common stock			$ 1.00
Dividends paid			$ 215,013,000
Dividend Declared in 2020
Stockholders Equity Note [Line Items]
Special dividend declared per share		$ 15.00
Dividend record date		Mar. 05, 2020
Dividend payable nature			special
Dividends paid	$ 215,000,000.0
Stock Repurchase Programs 2019
Stockholders Equity Note [Line Items]
Aggregate amount of common stock authorized for repurchase				$ 500,000,000.0
Stock Repurchase Programs 2018
Stockholders Equity Note [Line Items]
Aggregate amount of common stock authorized for repurchase					$ 400,000,000.0

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Allowance for Credit Losses on Reinsurance Recoverables (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Allowance for Credit Losses
Provision for credit losses	$ 3.5	[1]
Balance as of March 31, 2020	6.8
Accounting Standards Update 2016-13
Allowance for Credit Losses
Balance as of January 1, 2020	$ 3.3	[2]

[1] Primarily reflects an increase in the estimate of expected credit losses based on current conditions and reasonable and supportable forecasts as of March 31, 2020 arising from the Pandemic, as defined in Note 9(a) of this Form 10-Q.

[2] See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

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Reclassifications of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on early redemption of debt	$ (7.1)
Realized gain on reduction of contingent consideration liabilities	5.0
Alleghany Corporation | 2020 Senior Notes
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on early redemption of debt	(7.1)
Stranded Oil Resources Corporation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Write down of oil field assets	$ 30.0

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Investments - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2012 USD ($)	Mar. 31, 2020 USD ($) Investment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Investments [Line Items]
Proceeds from sale of debt and equity securities		$ 2,600,000	$ 2,500,000
Realized loss on early redemption of debt		(7,100)
Realized gain on reduction of contingent consideration liabilities		$ 5,000
Securities impairment test description		Alleghany continually monitors the difference between amortized cost and the estimated fair value of its debt investments. The analysis of a security’s decline in value is performed in its functional currency.  Debt securities in an unrealized loss position are evaluated for credit losses if they meet any of the following criteria: (i) they are trading at a discount of at least 20 percent to amortized cost and have a credit rating below investment grade or are not rated; (ii) there has been a negative credit or news event with respect to the issuer that could indicate the existence of a credit loss; 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 a credit 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 a credit 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 total 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.
Credit losses for available for sale securities		$ 31,375
Credit losses for available for sale securities			$ 10,020
Other invested assets		541,512		$ 573,605
Commercial mortgage loans		682,655		$ 686,206
Commercial mortgage loan investments in default or in arrears		$ 0
Minimum
Investments [Line Items]
Term of commercial mortgage loans		2 years
Maximum
Investments [Line Items]
Term of commercial mortgage loans		10 years
Pillar Capital Holdings Limited And Managed Fund
Investments [Line Items]
Other invested assets		$ 194,700
Pillar Capital Holdings Limited And Managed Fund | Reinsurance Segment
Investments [Line Items]
Investment in other invested asset	$ 175,000
Pillar Capital Holdings Limited And Managed Fund | Insurance Segment
Investments [Line Items]
Investment in other invested asset	$ 25,000
Debt Securities
Investments [Line Items]
Number of securities in an unrealized loss position | Investment		1,672
Number of securities in an unrealized loss position for 12 months or more | Investment		126
Stranded Oil Resources Corporation
Investments [Line Items]
Write down of oil field assets		$ 30,000
Precision Cutting Technologies, Inc
Investments [Line Items]
Realized gain on reduction of contingent consideration liabilities		$ 5,000

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Financial Instruments Measured at Fair Value and Level of Fair Value Hierarchy of Inputs (Parenthetical) (Detail) - USD ($) $ in Thousands		Mar. 31, 2020		Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		$ 13,337,754	[1]	$ 14,211,745
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	[2]	2,295,100		2,549,600
Collateralized loan obligations | Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of available for sale debt securities		$ 732,300		$ 834,200

[1] Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

[2] Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

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Amortized Cost and Fair Value of Available For Sale Securities (Parenthetical) (Detail) - USD ($) $ in Thousands		Mar. 31, 2020		Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available for sale debt securities		$ 13,337,754	[1]	$ 14,211,745
Other asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available for sale debt securities	[2]	2,295,100		2,549,600
Other asset-backed securities | Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Estimated fair value of available for sale debt securities		$ 732,300		$ 834,200

[1] Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

[2] Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - shares	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Statement Of Stockholders Equity [Abstract]
Common stock, Shares issued	17,459,961	17,459,961	17,459,961	17,459,961
Treasury stock, shares	3,150,279	3,095,333	3,012,224	2,883,452

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Equity securities, cost		$ 1,358,265	$ 1,625,256
Debt securities, amortized cost		13,320,808	$ 13,798,576
Allowance for credit losses	[1]	$ 31,375
Common stock, Shares authorized		22,000,000	22,000,000
Common stock, Shares issued		17,459,961	17,459,961
Treasury stock, shares		3,150,279	3,095,333

[1] See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

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Earnings Per Share of Common Stock

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share of Common Stock

8. Earnings Per Share of Common Stock

The following table presents a reconciliation of the earnings and share data used in the basic and diluted earnings per share computations for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions, except share amounts)
Net earnings available to Alleghany stockholders	$	(361.2	)	$	440.2
Effect of dilutive securities		(3.0	)		—
Income available to common stockholders for diluted earnings per share	$	(364.2	)	$	440.2
Weighted average common shares outstanding applicable to basic earnings per share		14,340,669			14,481,255
Effect of dilutive securities		15,439			3,981
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		14,356,108			14,485,236
Contingently issuable shares(1)		18,703			39,325

(1) Contingently issuable shares were potentially available in the periods presented, but were not included in the diluted earnings per share computations because the impact was anti-dilutive to the earnings per share calculation.

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Reinsurance Ceded

3 Months Ended

Mar. 31, 2020

Insurance [Abstract]

Reinsurance Ceded

4. Reinsurance Ceded

(a) Overview

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 generally purchase reinsurance and retrocessional coverages from highly- rated third-party reinsurers or on a collateralized basis. 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. A summary of the more significant programs follows.

TransRe enters into various retrocession arrangements, including property catastrophe retrocession contracts, to manage the effects of individual or aggregate exposure to losses, reduce volatility in specific lines of business, improve risk-adjusted portfolio returns, strengthen its market position and enhance capital efficiency. These include excess-of-loss and quota share treaties in traditional rated form as well as catastrophe bonds and other collateralized insurance-linked structures. TransRe’s retrocession protections generally have a one-year term and renewal dates occur throughout the year, with the majority renewing at January 1 and June 1. The catastrophe bonds, however, have a four-year term, with maturities in 2022 and 2023.

RSUI reinsures its property lines of business through a program consisting of surplus share treaties, facultative placements, and per risk and catastrophe excess of loss treaties. RSUI’s catastrophe reinsurance program and property per risk reinsurance program each run on an annual basis from May 1 to the following April 30 and portions expired on April 30, 2020. Both programs were renewed on May 1, 2020 with substantially similar terms as the expired programs.

(b) Reinsurance Recoverables

Amounts recoverable from reinsurers are recognized in a manner consistent with the loss and loss adjustment expense (“LAE”) liabilities associated with the reinsurance placement and presented on the balance sheet as reinsurance recoverables, and are recorded after an allowance for credit losses. Reinsurance recoverable balances as of March 31, 2020 and December 31, 2019 are presented in the table below:

	As of March 31,			As of December 31,
	2020			2019
	($ in millions)
Reinsurance recoverables on paid losses	$	75.9		$	98.1
Ceded outstanding loss and LAE		1,559.5			1,583.9
Reinsurance recoverables, before allowance for credit losses		1,635.4			1,682.0
Allowance for credit losses		(6.8	)		—
Total	$	1,628.6		$	1,682.0

The following table presents information regarding concentration of Alleghany’s reinsurance recoverables and the ratings profile of our reinsurers as of March 31, 2020:

Reinsurer(1)	Rating(2)	Amount			Percentage
	($ in millions)
Syndicates at Lloyd's of London	A (Excellent)	$	132.9			8.1	%
Kane SAC Ltd, Rondout Segregated Account(3)	not rated		121.8			7.4	%
PartnerRe Ltd	A (Excellent)		97.4			6.0	%
Fairfax Financial Holdings Ltd	A (Superior)		90.4			5.5	%
Swiss Reinsurance Company	A+ (Superior)		88.1			5.4	%
Third Point Reinsurance Group	A- (Excellent)		87.0			5.3	%
Kane SAC Ltd, Bowery Segregated Account(3)	not rated		77.4			4.7	%
RenaissanceRe Holdings Ltd	A+ (Superior)		75.4			4.6	%
W.R. Berkley Corporation	A+ (Superior)		67.7			4.1	%
Liberty Mutual	A (Excellent)		55.9			3.4	%
All other reinsurers			741.4			45.5	%
Total reinsurance recoverables, before allowance for credit losses(4)		$	1,635.4			100.0	%
Allowance for credit losses			(6.8	)
Total		$	1,628.6
Secured reinsurance recoverables(3)		$	659.6			40.3	%

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

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

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

(4) Approximately 66 percent of our reinsurance recoverables balance as of March 31, 2020 was due from reinsurers having an A.M. Best Company, Inc. financial strength rating of A (Excellent) or higher, with a majority of the other reinsurance recoverables being secured by funds held, trust agreements or letters of credit.

The following table presents a rollforward of Alleghany’s allowance for credit losses on reinsurance recoverables for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		3.3
Provision for credit losses(2)		3.5
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	6.8

(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

(2) Primarily reflects an increase in the estimate of expected credit losses based on current conditions and reasonable and supportable forecasts as of March 31, 2020 arising from the Pandemic, as defined in Note 9(a) of this Form 10-Q.

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Liability for Loss and LAE (Tables)

3 Months Ended

Mar. 31, 2020

Insurance [Abstract]

Activity in Liability for Loss and Loss Adjustment Expense

The following table presents the activity in the liability for loss and LAE for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Reserves as of January 1	$	11,928.4		$	12,250.3
Less: reinsurance recoverables(1)		1,583.9			1,857.4
Net reserves as of January 1		10,344.5			10,392.9
Other adjustments		—			(0.2	)
Incurred loss and LAE, net of reinsurance, related to:
Current year		1,086.4			829.9
Prior years		(59.0	)		(37.4	)
Total incurred loss and LAE, net of reinsurance		1,027.4			792.5
Paid loss and LAE, net of reinsurance, related to:(2)
Current year		87.3			75.3
Prior years		770.2			914.8
Total paid loss and LAE, net of reinsurance		857.5			990.1
Foreign currency exchange rate effect		(7.5	)		17.2
Net reserves as of March 31		10,506.9			10,212.3
Reinsurance recoverables as of March 31(1)		1,559.5			1,642.8
Reserves as of March 31	$	12,066.4		$	11,855.1

(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 months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020				2019
	($ in millions)
Reinsurance Segment
Property:
Catastrophe events	$	(32.3	)	(1)	$	8.4		(2)
Non-catastrophe		(14.4	)	(3)		(19.1	)	(4)
Total		(46.7	)			(10.7	)
Casualty & other:
Malpractice Treaties(5)		—				—
Other		(11.0	)	(6)		(25.7	)	(7)
Total		(11.0	)			(25.7	)
Total Reinsurance Segment		(57.7	)			(36.4	)
Insurance Segment
RSUI:
Casualty		(1.0	)	(8)		(5.6	)	(9)
Property and other		(0.5	)	(10)		1.9		(11)
Total		(1.5	)			(3.7	)
CapSpecialty		0.2		(12)		2.7		(12)
Total incurred related to prior years	$	(59.0	)		$	(37.4	)

(1) Primarily reflects favorable prior accident year loss reserve development related to Typhoon Hagibis in the 2019 accident year and catastrophes in the 2018 accident year.

(2) Primarily reflects unfavorable prior accident year loss reserve development related to Typhoon Jebi in the 2018 accident year, partially offset by favorable prior accident year loss reserve development related to the wildfires in California in the 2018 accident year.

(3) Primarily reflects favorable prior accident year loss reserve development in the 2017 and 2019 accident years.

(4) Primarily reflects favorable prior accident year loss reserve development in the 2016 through 2018 accident years.

(5) Represents certain 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) Primarily reflects favorable prior accident year loss reserve development in the longer-tailed lines of business in the 2013 and earlier accident years, partially offset by unfavorable prior accident year development in the shorter-tailed lines of business in the 2014 through 2019 accident years.

(7) Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed lines of business in the 2012 through 2017 prior accident years and in the professional liability lines of business in the 2007 and prior accident years.

(8) Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in recent accident years.

(9) Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in the 2017 accident year.

(10) Primarily reflects favorable prior accident year loss reserve development related to catastrophes in the 2018 accident year, partially offset by unfavorable prior accident year loss reserve development related to catastrophes in the 2017 accident year.

(11) Primarily reflects unfavorable prior accident year loss reserve development related to Hurricanes Harvey in the 2017 accident year and Florence in the 2018 accident year.

(12) Primarily reflects unfavorable prior accident year loss reserve development in certain specialty lines of business written through a program administrator in connection with a terminated program in the 2009 and 2010 accident years.

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Summary of Significant Accounting Principles (Policies)

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

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, 2019 (the “2019 Form 10-K”) of Alleghany Corporation (“Alleghany”).

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

Although Alleghany’s primary sources of revenues and earnings are its reinsurance and insurance operations and investments, Alleghany also generates revenues and expenses from a diverse portfolio of middle market businesses that are owned and managed through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s businesses include:

• Precision Cutting Technologies, Inc. (“PCT”), a holding company headquartered in Rockford, Illinois, with four operating businesses: (i) Bourn & Koch, Inc., a provider of precision automated machine tool solutions; (ii) Diamond Technology Innovations, Inc., a manufacturer of waterjet orifices and nozzles and a provider of related services; (iii) Coastal Industrial Distributors, LLC, a provider of high-performance solid carbide end mills; and (iv) as of March 2020, Supermill LLC, a manufacturer of high-performance carbide end mills;

• 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 design, engineering, procurement, construction management and validation 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;

• CHECO Holdings, LLC (“Concord”), a hotel management and development company, headquartered in Raleigh, North Carolina; and

• as of March 31, 2020, 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. On April 1, 2020, Alleghany Capital acquired an additional approximately 55 percent of Wilbert it previously did not own, bringing its equity interest in Wilbert to approximately 100 percent, and as of that date, the results of Wilbert will be included in Alleghany’s consolidated results.

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

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

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

The portion of stockholders’ equity, net earnings and comprehensive income that is not attributable to Alleghany stockholders is presented on the consolidated balance sheets, the consolidated statements of earnings and comprehensive income and the consolidated statements of changes in stockholders’ equity 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 and the consolidated statements of changes in stockholders’ equity as redeemable noncontrolling interests for all periods presented. In addition, Alleghany accretes the redeemable noncontrolling interests up to their future estimated redemption value over the period from the date of issuance to the earliest redemption date. The redemption value of the equity interests is generally based on the subsidiary’s earnings in specified periods preceding the applicable redemption date, calculated based on either a specified formula or an independent fair market valuation. During the first three months of 2020, the noncontrolling interests outstanding were approximately as follows: Kentucky Trailer - 23 percent; IPS - 15 percent; Jazwares - 25 percent; W&W|AFCO Steel - 20 percent; and Concord - 15 percent. Prior to April 1, 2019, the noncontrolling interests of PCT were approximately 11 percent.  All noncontrolling interest holders of PCT have exercised their repurchase options and sold their ownership interests to PCT effective April 1, 2019.

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 and reported revenues and expenses 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 2019 Form 10-K.

Recent Accounting Standards

(c) Recent Accounting Standards

Recently Adopted - 2019  

In February 2016, the Financial Accounting Standards Board (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 the prior guidance, a lessee was 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 remains largely unchanged. This guidance became effective in the first quarter of 2019 for public companies, with early adoption permitted. A modified retrospective transition approach was elected for all leases in existence as of, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Alleghany adopted this guidance in the first quarter of 2019 and the implementation did not have a material impact on its results of operations and financial condition. As part of its implementation, Alleghany elected to not separate lease components from non-lease components (such as office cleanings, security and maintenance services provided by Alleghany’s lessors for certain of its leases). Alleghany also elected the package of practical expedients under the transition guidance, which allowed Alleghany to not reevaluate existing lease classifications, among others. As of January 1, 2019, Alleghany’s adoption of this guidance resulted in recognition of an additional right-of-use asset of approximately $0.2 billion and a corresponding lease liability of $0.2 billion. See Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for further information on Alleghany’s leases.

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

Recently Adopted – 2020  

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, over the remaining expected life of such assets. Estimates of expected credit losses are to be based on historical experience, current conditions and reasonable and supportable forecasts. Under former FASB guidance, credit losses on these assets generally required a company to recognize credit losses when it was probable that a loss had been incurred. Credit losses for securities accounted for on an available for sale (“AFS”) basis are to be measured in a manner similar to GAAP as applied under former guidance and cannot exceed the amount by which the fair value is less than the amortized cost, although the new guidance removes the length of time a security has been in an unrealized loss position as a possible indication of a credit impairment. 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 was effective in the first quarter of 2020 for public companies, with early adoption permitted. Alleghany adopted this guidance in the first quarter of 2020.

As of January 1, 2020, Alleghany increased its allowances for credit losses on certain financial assets accounted for at cost or amortized cost by $4.5 million and recorded an after-tax cumulative effect reduction in opening retained earnings of $3.6 million.  The increase in allowances for credit losses primarily relates to reinsurance recoverables and commercial mortgage loans. See Note 4 of this Form 10-Q for further information on Alleghany’s reinsurance recoverables and Note 3(i) of this Form 10-Q for further information on Alleghany’s investments in commercial mortgage loans.  The increase in allowances for credit losses also relates to premium balances receivable. Estimates of expected credit losses for all of these assets are based on certain market-based indicators of credit quality, which are updated on an annual basis and re-assessed at least quarterly. Related credit loss expenses are recorded as a component of other operating expenses.  

As of January 1, 2020, credit losses for Alleghany’s AFS securities are recorded through an allowance for credit losses on the consolidated balance sheets and as credit losses for AFS securities in the consolidated statements of earnings and comprehensive income.  See Note 3(f) of this Form 10-Q for further information on the credit quality for Alleghany’s AFS securities.

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 was effective in the first quarter of 2020 for public companies, with early adoption permitted. Alleghany adopted this guidance in the first quarter of 2020 and the implementation did not have a material impact on its results of operations and financial condition. See Note 2 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for further information on Alleghany’s goodwill.

In August 2018, the FASB issued guidance that changes the financial statement disclosure requirements for measuring fair value. With respect to financial instruments classified as “Level 3” in the fair value disclosure hierarchy, the guidance requires certain additional disclosures for public companies related to amounts included in other comprehensive income and significant unobservable inputs used in the valuation, while removing disclosure requirements related to an entity’s overall valuation processes. The guidance also removes certain disclosure requirements related to transfers between financial instruments classified as “Level 1” and “Level 2” and provides clarification on certain other existing disclosure requirements. This guidance was effective for interim and annual periods beginning after December 15, 2019, with early adoption permitted with respect to any eliminated or modified disclosures. Alleghany adopted this guidance in the first quarter of 2020 and the implementation did not impact its results of operations or financial condition. See Note 2 of this Form 10-Q for further information on the fair value of Alleghany’s financial instruments.

In March 2020, the FASB issued guidance to expedite and simplify the accounting associated with the anticipated migration away from the widely-used London Inter-bank Offered Rate and other similar rates as benchmark interest rates after 2021.  Under pre-existing GAAP, such modifications made to: (i) loans and certain other contracts would require re-assessments of the accounting for those contacts, such as whether they were extinguished and remeasured from an accounting perspective; and (ii) derivative contracts may cause a change in accounting, such as a possible dedesignation of hedge accounting. This new guidance largely eliminates these requirements as a result of this migration to one or more new benchmark rates and is generally applicable for contract modifications made prior to December 31, 2022. Alleghany adopted this guidance in March 2020 and the implementation did not have an impact on its results of operations and financial condition.

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Summary of Significant Accounting Principles - Additional Information (Detail) - USD ($) $ in Millions	Jan. 01, 2020	Apr. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2019
Accounting Standards Update 2016-02
Significant Accounting Policies [Line Items]
Right-of-use asset					$ 200.0
Lease liability					$ 200.0
Accounting Standards Update 2016-13
Significant Accounting Policies [Line Items]
Allowances for credit losses on certain financial assets	$ 4.5
After-tax cumulative effect reduction in opening retained earnings	$ (3.6)
Wilbert Funeral Services, Inc
Significant Accounting Policies [Line Items]
Equity interest percentage			45.00%
Subsequent Event | Wilbert Funeral Services, Inc
Significant Accounting Policies [Line Items]
Equity interest percentage		100.00%
Equity interest percentage acquired		55.00%
Kentucky Trailer
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners			23.00%
Integrated Project Services LLC
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners			15.00%
Precision Cutting Technologies, 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			25.00%
WWSC Holdings, LLC
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners			20.00%
Concord
Significant Accounting Policies [Line Items]
Ownership of interest held by noncontrolling partners			15.00%

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Summary of Identifiable Assets and Equity (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Identifiable Assets	$ 25,752,941	$ 26,931,604
Invested Assets and Cash	18,363,500
Equity Attributable to Alleghany	7,857,062	$ 8,776,734	$ 8,236,487	$ 7,692,710
Operating Segments
Segment Reporting Information [Line Items]
Identifiable Assets	25,365,600
Invested Assets and Cash	18,046,300
Equity Attributable to Alleghany	8,153,100
Operating Segments | Reinsurance Segment
Segment Reporting Information [Line Items]
Identifiable Assets	16,819,800
Invested Assets and Cash	13,077,200
Equity Attributable to Alleghany	4,774,900
Operating Segments | Insurance Segment
Segment Reporting Information [Line Items]
Identifiable Assets	6,414,100
Invested Assets and Cash	4,697,600
Equity Attributable to Alleghany	2,377,500
Operating Segments | Reinsurance Segment and Insurance Segment
Segment Reporting Information [Line Items]
Identifiable Assets	23,233,900
Invested Assets and Cash	17,774,800
Equity Attributable to Alleghany	7,152,400
Operating Segments | Alleghany Capital Corporation Segment
Segment Reporting Information [Line Items]
Identifiable Assets	2,131,700
Invested Assets and Cash	271,500
Equity Attributable to Alleghany	1,000,700
Corporate activities
Segment Reporting Information [Line Items]
Identifiable Assets	387,400
Invested Assets and Cash	317,200
Equity Attributable to Alleghany	$ (296,000)

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Information Regarding Concentration of Reinsurance Recoverables and The Ratings Profile of Our Reinsurers (Parenthetical) (Detail) - Reinsurance Recoverable - Reinsurer Concentration Risk	3 Months Ended
	Mar. 31, 2020
Ceded Credit Risk [Line Items]
Reinsurance recoverable as percentage of total reinsurance recoverables	100.00%	[1],[2]
Reinsurers Rated A Or Higher
Ceded Credit Risk [Line Items]
Reinsurance recoverable as percentage of total reinsurance recoverables	66.00%

[1] Approximately 66 percent of our reinsurance recoverables balance as of March 31, 2020 was due from reinsurers having an A.M. Best Company, Inc. financial strength rating of A (Excellent) or higher, with a majority of the other reinsurance recoverables being secured by funds held, trust agreements or letters of credit.

[2] Reinsurance recoverables reflect amounts due from one or more reinsurance subsidiaries of the listed company.

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Allowance for Credit Losses on Available for Sale Securities (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Credit losses for available for sale securities	$ 31,375
Ending balance	$ 31,375	[1]

[1] See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

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Allowance for Credit Losses on Commercial Mortgage Loans (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for credit losses	$ 1.2	[1]
Ending balance	2.0
Accounting Standards Update 2016-13
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	$ 0.8	[2]

[1] Primarily reflects an increase in the estimate of expected credit losses based on current conditions and reasonable and supportable forecasts as of March 31, 2020 arising from the Pandemic, as defined in Note 9(a) of this Form 10-Q.

[2] See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

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Reconciliation of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 8,776,734	$ 7,692,710
Other comprehensive income (loss), net of tax:
Ending Balance	7,857,062	8,236,487
Unrealized Appreciation of Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	321,000	(61,600)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications	(276,600)	183,400
Reclassifications from accumulated other comprehensive income	(10,900)	4,400
Total	(287,500)	187,800
Ending Balance	33,500	126,200
Unrealized Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(121,800)	(124,700)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications	(13,700)	(900)
Total	(13,700)	(900)
Ending Balance	(135,500)	(125,600)
Retirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(27,900)	(15,700)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications	500	900
Total	500	900
Ending Balance	(27,400)	(14,800)
Accumulated Other Comprehensive Income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	171,350	(202,003)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications	(289,800)	183,400
Reclassifications from accumulated other comprehensive income	(10,900)	4,400
Total	(300,700)	187,800
Ending Balance	$ (129,343)	$ (14,157)

XML

(Favorable) Unfavorable Prior Accident Year Loss Reserve Development (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Claims Development [Line Items]
Claims incurred related to prior years		$ (59.0)		$ (37.4)
Reinsurance Segment
Claims Development [Line Items]
Claims incurred related to prior years		(57.7)		(36.4)
Reinsurance Segment | Property
Claims Development [Line Items]
Claims incurred related to prior years		(46.7)		(10.7)
Reinsurance Segment | Property | Property Catastrophe
Claims Development [Line Items]
Claims incurred related to prior years		(32.3)	[1]	8.4	[2]
Reinsurance Segment | Property | Property Non-catastrophe
Claims Development [Line Items]
Claims incurred related to prior years		(14.4)	[3]	(19.1)	[4]
Reinsurance Segment | Casualty & Other
Claims Development [Line Items]
Claims incurred related to prior years		(11.0)		(25.7)
Reinsurance Segment | Casualty & Other | All Other Casualty and Other
Claims Development [Line Items]
Claims incurred related to prior years		(11.0)	[5]	(25.7)	[6]
Insurance Segment | RSUI
Claims Development [Line Items]
Claims incurred related to prior years		(1.5)		(3.7)
Insurance Segment | RSUI | Casualty Insurance
Claims Development [Line Items]
Claims incurred related to prior years		(1.0)	[7]	(5.6)	[8]
Insurance Segment | RSUI | Property and Other Insurance
Claims Development [Line Items]
Claims incurred related to prior years		(0.5)	[9]	1.9	[10]
Insurance Segment | CapSpecialty Incorporated
Claims Development [Line Items]
Claims incurred related to prior years	[11]	$ 0.2		$ 2.7

[1] Primarily reflects favorable prior accident year loss reserve development related to Typhoon Hagibis in the 2019 accident year and catastrophes in the 2018 accident year.

[2] Primarily reflects unfavorable prior accident year loss reserve development related to Typhoon Jebi in the 2018 accident year, partially offset by favorable prior accident year loss reserve development related to the wildfires in California in the 2018 accident year.

[3] Primarily reflects favorable prior accident year loss reserve development in the 2017 and 2019 accident years.

[4] Primarily reflects favorable prior accident year loss reserve development in the 2016 through 2018 accident years.

[5] Primarily reflects favorable prior accident year loss reserve development in the longer-tailed lines of business in the 2013 and earlier accident years, partially offset by unfavorable prior accident year development in the shorter-tailed lines of business in the 2014 through 2019 accident years.

[6] Primarily reflects favorable prior accident year loss reserve development in the shorter-tailed lines of business in the 2012 through 2017 prior accident years and in the professional liability lines of business in the 2007 and prior accident years.

[7] Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in recent accident years.

[8] Primarily reflects favorable prior accident year loss reserve development in the directors’ and officers’ liability and umbrella/excess lines of business in the 2011 through 2015 accident years, partially offset by unfavorable prior accident year loss reserve development in the professional liability lines of business in the 2017 accident year.

[9] Primarily reflects favorable prior accident year loss reserve development related to catastrophes in the 2018 accident year, partially offset by unfavorable prior accident year loss reserve development related to catastrophes in the 2017 accident year.

[10] Primarily reflects unfavorable prior accident year loss reserve development related to Hurricanes Harvey in the 2017 accident year and Florence in the 2018 accident year.

[11] Primarily reflects unfavorable prior accident year loss reserve development in certain specialty lines of business written through a program administrator in connection with a terminated program in the 2009 and 2010 accident years.

XML

Consolidated Statements of Earnings and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Change in unrealized gains, deferred taxes	$ (73,534)	$ 48,749
Reclassification for net realized capital gains and credit losses for available for sale securities, taxes	(2,883)	1,171
Change in unrealized currency translation adjustment, deferred taxes	$ (3,651)	$ (235)

XML

Segments of Business

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

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 businesses into three reportable segments – reinsurance, insurance and Alleghany Capital.

Reinsurance and insurance underwriting activities are evaluated separately from investment and other activities. Segment accounting policies are described in Note 1 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 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 other reinsurers through brokers and on a direct basis to ceding companies. TransRe writes a modest amount of property and casualty insurance business, which is included in the reinsurance segment. A significant portion of the premiums earned by TransRe’s operations are generated by offices located in Canada, Europe, Asia, Australia, Africa and those serving Latin America and the Caribbean. Although the majority of the premiums earned by these offices typically relate to the regions where they are located, a significant portion may be derived from other regions of the world, including the U.S. In addition, although a significant portion of the assets and liabilities of these foreign offices generally relate to the countries where the 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 and CapSpecialty. RSUI also writes a modest amount of assumed reinsurance business, which is included in the insurance segment.

The Alleghany Capital segment consists of industrial operations, non-industrial operations and corporate operations at the Alleghany Capital level. Industrial operations are conducted through PCT, Kentucky Trailer, W&W|AFCO Steel and, through March 31, 2020, a 45 percent equity interest in Wilbert. Non-industrial operations are conducted through IPS, Jazwares and Concord.

Corporate activities are not classified as a segment. The primary components of corporate activities are Alleghany Properties, SORC and activities at the Alleghany parent company. Corporate activities also include the elimination of minor activity between segments.

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 11 of this Form 10-Q.

(b) Results

The following tables present segment results for Alleghany’s three reportable segments and for corporate activities for the three months ended March 31, 2020 and 2019:

		Reinsurance Segment									Insurance Segment
Three Months Ended March 31, 2020		Property			Casualty & other (1)			Total			RSUI		Cap Specialty			Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities			Consolidated
	($ in millions)
Gross premiums written		$	412.6		$	914.9		$	1,327.5		$	365.9	$	85.5		$	451.4	$	1,778.9		$	—	$	1,778.9		$	(8.3	)	$	1,770.6
Net premiums written			312.9			898.1			1,211.0			244.5		78.2			322.7		1,533.7			—		1,533.7			—			1,533.7
Net premiums earned			321.4			811.7			1,133.1			229.4		81.9			311.3		1,444.4			—		1,444.4			—			1,444.4
Net loss and LAE			247.9			614.3			862.2			116.0		49.2			165.2		1,027.4			—		1,027.4			—			1,027.4
Commissions, brokerage and other    underwriting expenses			105.4			244.4			349.8			57.8		33.8			91.6		441.4			—		441.4			—			441.4
Underwriting (loss) profit(2)		$	(31.9	)	$	(47.0	)	$	(78.9	)	$	55.6	$	(1.1	)	$	54.5		(24.4	)		—		(24.4	)		—			(24.4	)
Net investment income																			109.7			1.8		111.5			0.5			112.0
Change in the fair value of equity securities																			(521.6	)		—		(521.6	)		(1.4	)		(523.0	)
Net realized capital gains																			45.1			4.9		50.0			(37.0	)		13.0
Credit losses for available for sale securities																			(30.7	)		—		(30.7	)		(0.7	)		(31.4	)
Noninsurance revenue																			7.4			457.3		464.7			3.2			467.9
Other operating expenses																			9.9			450.7		460.6			6.1			466.7
Corporate administration																			(2.0	)		—		(2.0	)		(12.3	)		(14.3	)
Amortization of intangible assets																			0.4			9.2		9.6			—			9.6
Interest expense																			6.7			3.8		10.5			7.8			18.3
Earnings (losses) before income taxes																		$	(429.5	)	$	0.3	$	(429.2	)	$	(37.0	)	$	(466.2	)

		Reinsurance Segment							Insurance Segment
Three Months Ended March 31, 2019		Property		Casualty & other (1)			Total		RSUI		Cap Specialty		Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities			Consolidated
	($ in millions)
Gross premiums written		$	415.1	$	816.5		$	1,231.6	$	299.0	$	82.8	$	381.8	$	1,613.4		$	—	$	1,613.4		$	(6.8	)	$	1,606.6
Net premiums written			316.2		791.4			1,107.6		201.4		76.7		278.1		1,385.7			—		1,385.7			—			1,385.7
Net premiums earned			308.9		720.3			1,029.2		192.4		75.7		268.1		1,297.3			—		1,297.3			—			1,297.3
Net loss and LAE			162.6		490.6			653.2		94.3		45.0		139.3		792.5			—		792.5			—			792.5
Commissions, brokerage and other    underwriting expenses			103.7		232.3			336.0		53.5		30.6		84.1		420.1			—		420.1			—			420.1
Underwriting (loss) profit(2)		$	42.6	$	(2.6	)	$	40.0	$	44.6	$	0.1	$	44.7		84.7			—		84.7			—			84.7
Net investment income																117.9			1.3		119.2			3.8			123.0
Change in the fair value of equity securities																389.1			—		389.1			3.3			392.4
Net realized capital gains																4.1			0.3		4.4			—			4.4
Credit losses for available for sale securities																(10.0	)		—		(10.0	)		—			(10.0	)
Noninsurance revenue																5.4			505.0		510.4			3.7			514.1
Other operating expenses																29.7			465.4		495.1			7.3			502.4
Corporate administration																1.1			—		1.1			18.3			19.4
Amortization of intangible assets																0.2			6.7		6.9			—			6.9
Interest expense																6.7			4.3		11.0			12.5			23.5
Earnings (losses) before income taxes															$	553.5		$	30.2	$	583.7		$	(27.3	)	$	556.4

(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; mortgage reinsurance; surety; and credit.

(2) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, credit losses for available for sale securities, noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its reinsurance and insurance segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company’s ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.

(c) Identifiable Assets and Equity

The following table presents identifiable assets, the portion of identifiable assets related to cash and invested assets and equity attributable to Alleghany for Alleghany’s reportable segments and for corporate activities as of March 31, 2020:

	Identifiable Assets		Invested Assets and Cash		Equity Attributable to Alleghany
	($ in millions)
Reinsurance segment	$	16,819.8	$	13,077.2	$	4,774.9
Insurance segment		6,414.1		4,697.6		2,377.5
Subtotal		23,233.9		17,774.8		7,152.4
Alleghany Capital		2,131.7		271.5		1,000.7
Total segments		25,365.6		18,046.3		8,153.1
Corporate activities		387.4		317.2		(296.0	)
Consolidated	$	25,753.0	$	18,363.5	$	7,857.1

(d) Alleghany Capital Noninsurance Revenue

For Alleghany Capital’s industrial and non-industrial operations, noninsurance revenue consists of the sale of manufactured goods and services. The following table presents noninsurance revenue for the Alleghany Capital segment for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020		2019
	($ in millions)
Industrial(1)	$	242.5	$	260.1
Non-Industrial(2)		214.7		244.9
Corporate & other		0.1		—
Alleghany Capital	$	457.3	$	505.0

(1) For the three months ended March 31, 2020 and 2019, the vast majority of noninsurance revenue was recognized as goods and services transferred to customers over time.

(2) For the three months ended March 31, 2020 and 2019, approximately 82 percent 66 percent, respectively, of noninsurance revenue was recognized as services transferred to customers over time, with the remainder recognized as goods transferred at a point in time.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	Apr. 26, 2020
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Registrant Name	ALLEGHANY CORP /DE
Entity Central Index Key	0000775368
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		14,309,682
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Trading Symbol	Y
Title of 12(b) Security	Common Stock
Security Exchange Name	NYSE
Entity File Number	1-9371
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	51-0283071
Entity Address, Address Line One	1411 Broadway, 34th Floor
Entity Address, City or Town	NY
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10018
City Area Code	212
Local Phone Number	752-1356
Document Quarterly Report	true
Document Transition Report	false

XML

Income Taxes

3 Months Ended

Mar. 31, 2020

Income Tax Disclosure [Abstract]

Income Taxes

6. Income Taxes

The Coronavirus Aid, Relief and Economic Security Act (the "CARES Act") was signed into law on March 27, 2020.  Among other provisions, the CARES Act delayed certain employer payroll tax remittance deadlines and created or expanded certain income tax credits and loss carryback provisions and, as a result, Alleghany recorded a $6.9 million tax benefit as of March 31, 2020.

The effective tax rate on earnings before income taxes for the first three months of 2020 was 22.4  percent compared with 19.5 percent for the first three months of 2019. The effective tax rate in the first three months of 2020 was calculated based on actual results through March 31, 2020 because management was not able to reliably estimate the annual effective tax rate in light of the significant losses incurred.  The increase in the effective tax rate in the first quarter of 2020 from the first quarter of 2019 primarily reflects the impact of the CARES Act.

Alleghany believes that, as of March 31, 2020, it had no material uncertain tax positions. Interest and penalties related to unrecognized tax expenses (benefits) are recognized in income tax expense, when applicable. There were no material liabilities for interest or penalties accrued as of March 31, 2020.

XML

Summary of Significant Accounting Principles

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

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, 2019 (the “2019 Form 10-K”) of Alleghany Corporation (“Alleghany”).

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

Although Alleghany’s primary sources of revenues and earnings are its reinsurance and insurance operations and investments, Alleghany also generates revenues and expenses from a diverse portfolio of middle market businesses that are owned and managed through its wholly-owned subsidiary Alleghany Capital Corporation (“Alleghany Capital”). Alleghany Capital’s businesses include:

• Precision Cutting Technologies, Inc. (“PCT”), a holding company headquartered in Rockford, Illinois, with four operating businesses: (i) Bourn & Koch, Inc., a provider of precision automated machine tool solutions; (ii) Diamond Technology Innovations, Inc., a manufacturer of waterjet orifices and nozzles and a provider of related services; (iii) Coastal Industrial Distributors, LLC, a provider of high-performance solid carbide end mills; and (iv) as of March 2020, Supermill LLC, a manufacturer of high-performance carbide end mills;

• 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 design, engineering, procurement, construction management and validation 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;

• CHECO Holdings, LLC (“Concord”), a hotel management and development company, headquartered in Raleigh, North Carolina; and

• as of March 31, 2020, 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. On April 1, 2020, Alleghany Capital acquired an additional approximately 55 percent of Wilbert it previously did not own, bringing its equity interest in Wilbert to approximately 100 percent, and as of that date, the results of Wilbert will be included in Alleghany’s consolidated results.

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

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

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

The portion of stockholders’ equity, net earnings and comprehensive income that is not attributable to Alleghany stockholders is presented on the consolidated balance sheets, the consolidated statements of earnings and comprehensive income and the consolidated statements of changes in stockholders’ equity 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 and the consolidated statements of changes in stockholders’ equity as redeemable noncontrolling interests for all periods presented. In addition, Alleghany accretes the redeemable noncontrolling interests up to their future estimated redemption value over the period from the date of issuance to the earliest redemption date. The redemption value of the equity interests is generally based on the subsidiary’s earnings in specified periods preceding the applicable redemption date, calculated based on either a specified formula or an independent fair market valuation. During the first three months of 2020, the noncontrolling interests outstanding were approximately as follows: Kentucky Trailer - 23 percent; IPS - 15 percent; Jazwares - 25 percent; W&W|AFCO Steel - 20 percent; and Concord - 15 percent. Prior to April 1, 2019, the noncontrolling interests of PCT were approximately 11 percent.  All noncontrolling interest holders of PCT have exercised their repurchase options and sold their ownership interests to PCT effective April 1, 2019.

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 and reported revenues and expenses 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 2019 Form 10-K.

(c) Recent Accounting Standards

Recently Adopted - 2019  

In February 2016, the Financial Accounting Standards Board (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 the prior guidance, a lessee was 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 remains largely unchanged. This guidance became effective in the first quarter of 2019 for public companies, with early adoption permitted. A modified retrospective transition approach was elected for all leases in existence as of, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Alleghany adopted this guidance in the first quarter of 2019 and the implementation did not have a material impact on its results of operations and financial condition. As part of its implementation, Alleghany elected to not separate lease components from non-lease components (such as office cleanings, security and maintenance services provided by Alleghany’s lessors for certain of its leases). Alleghany also elected the package of practical expedients under the transition guidance, which allowed Alleghany to not reevaluate existing lease classifications, among others. As of January 1, 2019, Alleghany’s adoption of this guidance resulted in recognition of an additional right-of-use asset of approximately $0.2 billion and a corresponding lease liability of $0.2 billion. See Note 12(b) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for further information on Alleghany’s leases.

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

Recently Adopted – 2020  

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, over the remaining expected life of such assets. Estimates of expected credit losses are to be based on historical experience, current conditions and reasonable and supportable forecasts. Under former FASB guidance, credit losses on these assets generally required a company to recognize credit losses when it was probable that a loss had been incurred. Credit losses for securities accounted for on an available for sale (“AFS”) basis are to be measured in a manner similar to GAAP as applied under former guidance and cannot exceed the amount by which the fair value is less than the amortized cost, although the new guidance removes the length of time a security has been in an unrealized loss position as a possible indication of a credit impairment. 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 was effective in the first quarter of 2020 for public companies, with early adoption permitted. Alleghany adopted this guidance in the first quarter of 2020.

As of January 1, 2020, Alleghany increased its allowances for credit losses on certain financial assets accounted for at cost or amortized cost by $4.5 million and recorded an after-tax cumulative effect reduction in opening retained earnings of $3.6 million.  The increase in allowances for credit losses primarily relates to reinsurance recoverables and commercial mortgage loans. See Note 4 of this Form 10-Q for further information on Alleghany’s reinsurance recoverables and Note 3(i) of this Form 10-Q for further information on Alleghany’s investments in commercial mortgage loans.  The increase in allowances for credit losses also relates to premium balances receivable. Estimates of expected credit losses for all of these assets are based on certain market-based indicators of credit quality, which are updated on an annual basis and re-assessed at least quarterly. Related credit loss expenses are recorded as a component of other operating expenses.  

As of January 1, 2020, credit losses for Alleghany’s AFS securities are recorded through an allowance for credit losses on the consolidated balance sheets and as credit losses for AFS securities in the consolidated statements of earnings and comprehensive income.  See Note 3(f) of this Form 10-Q for further information on the credit quality for Alleghany’s AFS securities.

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 was effective in the first quarter of 2020 for public companies, with early adoption permitted. Alleghany adopted this guidance in the first quarter of 2020 and the implementation did not have a material impact on its results of operations and financial condition. See Note 2 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for further information on Alleghany’s goodwill.

In August 2018, the FASB issued guidance that changes the financial statement disclosure requirements for measuring fair value. With respect to financial instruments classified as “Level 3” in the fair value disclosure hierarchy, the guidance requires certain additional disclosures for public companies related to amounts included in other comprehensive income and significant unobservable inputs used in the valuation, while removing disclosure requirements related to an entity’s overall valuation processes. The guidance also removes certain disclosure requirements related to transfers between financial instruments classified as “Level 1” and “Level 2” and provides clarification on certain other existing disclosure requirements. This guidance was effective for interim and annual periods beginning after December 15, 2019, with early adoption permitted with respect to any eliminated or modified disclosures. Alleghany adopted this guidance in the first quarter of 2020 and the implementation did not impact its results of operations or financial condition. See Note 2 of this Form 10-Q for further information on the fair value of Alleghany’s financial instruments.

In March 2020, the FASB issued guidance to expedite and simplify the accounting associated with the anticipated migration away from the widely-used London Inter-bank Offered Rate and other similar rates as benchmark interest rates after 2021.  Under pre-existing GAAP, such modifications made to: (i) loans and certain other contracts would require re-assessments of the accounting for those contacts, such as whether they were extinguished and remeasured from an accounting perspective; and (ii) derivative contracts may cause a change in accounting, such as a possible dedesignation of hedge accounting. This new guidance largely eliminates these requirements as a result of this migration to one or more new benchmark rates and is generally applicable for contract modifications made prior to December 31, 2022. Alleghany adopted this guidance in March 2020 and the implementation did not have an impact on its results of operations and financial condition.

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Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

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 March 31, 2020 and December 31, 2019:

	March 31, 2020				December 31, 2019
	Carrying Value		Fair Value		Carrying Value		Fair Value
	($ in millions)
Assets
Investments (excluding equity method investments and loans)(1)	$	15,584.6	$	15,584.6	$	17,632.3	$	17,632.3
Liabilities
Senior notes and other debt(2)	$	1,514.4	$	1,674.8	$	1,751.1	$	1,962.7

(1) This table includes debt and equity securities, as well as partnership and non-marketable equity investments accounted for 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 accounted for at unpaid principal balance. The fair value of short-term investments approximates amortized cost. The fair value of all other categories of investments is disclosed below.

(2) See Note 11 of this Form 10-Q 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 March 31, 2020 and December 31, 2019:

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of March 31, 2020
Equity securities:
Common stock	$	1,702.6	$	3.5	$	—	$	1,706.1
Preferred stock		—		2.1		2.0		4.1
Total equity securities		1,702.6		5.6		2.0		1,710.2
Debt securities:
U.S. Government obligations		—		846.3		—		846.3
Municipal bonds		—		2,272.6		—		2,272.6
Foreign government obligations		—		696.0		—		696.0
U.S. corporate bonds		—		2,805.2		589.5		3,394.7
Foreign corporate bonds		—		1,125.9		164.7		1,290.6
Mortgage and asset-backed securities:
Residential mortgage-backed securities (“RMBS”)(1)		—		1,697.4		2.5		1,699.9
Commercial mortgage-backed securities (“CMBS”)		—		838.1		4.5		842.6
Other asset-backed securities(2)		—		1,548.4		746.7		2,295.1
Total debt securities(3)		—		11,829.9		1,507.9		13,337.8
Short-term investments		—		536.1		—		536.1
Other invested assets(4)		—		—		0.5		0.5
Total investments (excluding equity method investments and loans)	$	1,702.6	$	12,371.6	$	1,510.4	$	15,584.6
Senior notes and other debt	$	—	$	1,245.0	$	429.8	$	1,674.8

	Level 1		Level 2		Level 3		Total
	($ in millions)
As of December 31, 2019
Equity securities:
Common stock	$	2,498.1	$	3.3	$	—	$	2,501.4
Preferred stock		—		2.1		2.0		4.1
Total equity securities		2,498.1		5.4		2.0		2,505.5
Debt securities:
U.S. Government obligations		—		1,215.0		—		1,215.0
Municipal bonds		—		2,307.9		—		2,307.9
Foreign government obligations		—		690.7		—		690.7
U.S. corporate bonds		—		2,754.0		605.0		3,359.0
Foreign corporate bonds		—		1,208.7		168.7		1,377.4
Mortgage and asset-backed securities:
RMBS(1)		—		1,838.5		1.9		1,840.4
CMBS		—		865.9		5.8		871.7
Other asset-backed securities(2)		—		1,692.9		856.7		2,549.6
Total debt securities		—		12,573.6		1,638.1		14,211.7
Short-term investments		—		914.8		—		914.8
Other invested assets(4)		—		—		0.3		0.3
Total investments (excluding equity method investments and loans)	$	2,498.1	$	13,493.8	$	1,640.4	$	17,632.3
Senior notes and other debt	$	—	$	1,595.6	$	367.1	$	1,962.7

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

(2) Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

(3) Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

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

In the three months ended March 31, 2020, Alleghany transferred out of Level 3 $14.7 million of financial instruments, principally due to an increase in observable inputs related to the valuation of such assets. Specifically, during the first three months of 2020, there was a decrease in the weight given to non-binding broker quotes and, as a result, there was a corresponding increase in quoted prices for similar assets in active markets. Of the $14.7 million of transfers, $11.4 million related to other asset-backed securities, with the remainder related to foreign corporate bonds.

In the three months ended March 31, 2019, Alleghany transferred into Level 3 $14.7 million of foreign corporate bonds, principally due to a decrease in observable inputs related to the valuation of such assets.  Specifically, during the first three months of 2019, there was an increase in the weight given to non-binding broker quotes and, as a result, there was a corresponding decrease in quoted prices for similar assets in active markets.

In the three months ended March 31, 2019, Alleghany transferred out of Level 3 $1.0 million of U.S. corporate bonds, principally due to an increase in observable inputs related to the valuation of such assets. Specifically, during the first three months of 2019, there was a decrease in the weight given to non-binding broker quotes, and as a result, there was a corresponding increase in quoted prices for similar assets in active markets.

The following tables present reconciliations of the changes in Level 3 assets during the three months ended March 31, 2020 and 2019 measured at fair value:

			Debt Securities
									Mortgage and asset-backed
Three Months Ended March 31, 2020	Preferred Stock		U.S. Corporate Bonds			Foreign Corporate Bonds			RMBS			CMBS			Other Asset- backed Securities			Other Invested Assets(1)		Total
	($ in millions)
Balance as of January 1, 2020	$	2.0	$	605.0		$	168.7		$	1.9		$	5.8		$	856.7		$	0.3	$	1,640.4
Net realized/unrealized gains (losses) included in:
Net earnings (losses)(2)		—		0.2			—			—			—			(0.1	)		—		0.1
Other comprehensive income (loss)		—		(18.8	)		(7.3	)		(0.2	)		(1.3	)		(101.4	)		0.2		(128.8	)
Purchases		—		6.7			7.7			0.9			—			43.6			—		58.9
Sales		—		—			—			—			—			(8.3	)		—		(8.3	)
Issuances		—		—			—			—			—			—			—		—
Settlements		—		(3.6	)		(1.1	)		(0.1	)		—			(32.4	)		—		(37.2	)
Transfers into Level 3		—		—			—			—			—			—			—		—
Transfers out of Level 3		—		—			(3.3	)		—			—			(11.4	)		—		(14.7	)
Balance as of March 31, 2020	$	2.0	$	589.5		$	164.7		$	2.5		$	4.5		$	746.7		$	0.5	$	1,510.4

				Debt Securities
										Mortgage and asset-backed
Three Months Ended March 31, 2019	Preferred Stock			U.S. Corporate Bonds			Foreign Corporate Bonds			CMBS		Other Asset- backed Securities			Other Invested Assets(1)			Total
	($ in millions)
Balance as of January 1, 2019	$	5.4		$	425.7		$	126.9		$	—	$	1,266.9		$	0.7		$	1,825.6
Net realized/unrealized gains (losses) included in:
Net (losses)(2)		—			(9.9	)		—			—		—			—			(9.9	)
Other comprehensive income (loss)		(0.8	)		15.7			2.6			—		15.2			(0.2	)		32.5
Purchases		—			5.8			13.8			0.2		49.6			—			69.4
Sales		—			—			(5.6	)		—		(116.9	)		—			(122.5	)
Issuances		—			—			—			—		—			—			—
Settlements		—			(2.6	)		(1.0	)		—		(35.8	)		—			(39.4	)
Transfers into Level 3		—			—			14.7			—		—			—			14.7
Transfers out of Level 3		—			(1.0	)		—			—		—			—			(1.0	)
Balance as of March 31, 2019	$	4.6		$	433.7		$	151.4		$	0.2	$	1,179.0		$	0.5		$	1,769.4

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

(2) There were no credit losses recorded in net earnings related to Level 3 assets still held as of March 31, 2020 and 2019.

The increase in senior notes and other debt included in Level 3 for the first three months of 2020 primarily reflects increased borrowings at Jazwares due to an increase in working capital needs.

Although Alleghany is responsible for the determination of the fair value of Alleghany’s financial assets and the supporting methodologies and assumptions, it employs 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 valuation models. As of March 31, 2020 and December 31, 2019, the fair value for the vast majority of debt securities included in Level 3 was provided by such third-party valuation service providers, and as such, valuation details on these securities are generally not available to Alleghany.

Alleghany employs specific control processes to determine the reasonableness of the fair values of its financial assets and liabilities. Alleghany’s 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. Alleghany assesses the reasonableness of individual security values received from valuation service providers through various analytical techniques. In addition, Alleghany validates the reasonableness of fair values by comparing information obtained from Alleghany’s valuation service providers to other third-party valuation sources for selected securities. Alleghany also validates 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. See Note 1(c) to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for Alleghany’s accounting policy on fair value.

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Reconciliations of Changes in Level Three Assets Measured at Fair Value (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 1,640.4	$ 1,825.6
Net realized/unrealized gains (losses) included in:
Net earnings (losses)	[1]	0.1	(9.9)
Other comprehensive income (loss)		(128.8)	32.5
Purchases		58.9	69.4
Sales		(8.3)	(122.5)
Settlements		(37.2)	(39.4)
Transfers into Level 3			14.7
Transfers out of Level 3		(14.7)	(1.0)
Ending balance		1,510.4	1,769.4
Preferred Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		2.0	5.4
Net realized/unrealized gains (losses) included in:
Other comprehensive income (loss)			(0.8)
Ending balance		2.0	4.6
U.S. corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		605.0	425.7
Net realized/unrealized gains (losses) included in:
Net earnings (losses)	[1]	0.2	(9.9)
Other comprehensive income (loss)		(18.8)	15.7
Purchases		6.7	5.8
Settlements		(3.6)	(2.6)
Transfers out of Level 3			(1.0)
Ending balance		589.5	433.7
Foreign corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		168.7	126.9
Net realized/unrealized gains (losses) included in:
Other comprehensive income (loss)		(7.3)	2.6
Purchases		7.7	13.8
Sales			(5.6)
Settlements		(1.1)	(1.0)
Transfers into Level 3			14.7
Transfers out of Level 3		(3.3)
Ending balance		164.7	151.4
RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		1.9
Net realized/unrealized gains (losses) included in:
Other comprehensive income (loss)		(0.2)
Purchases		0.9
Settlements		(0.1)
Ending balance		2.5
CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		5.8
Net realized/unrealized gains (losses) included in:
Other comprehensive income (loss)		(1.3)
Purchases			0.2
Ending balance		4.5	0.2
Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	[2]	0.3	0.7
Net realized/unrealized gains (losses) included in:
Other comprehensive income (loss)	[2]	0.2	(0.2)
Ending balance	[2]	0.5	0.5
Other Asset Backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		856.7	1,266.9
Net realized/unrealized gains (losses) included in:
Net earnings (losses)	[1]	(0.1)
Other comprehensive income (loss)		(101.4)	15.2
Purchases		43.6	49.6
Sales		(8.3)	(116.9)
Settlements		(32.4)	(35.8)
Transfers out of Level 3		(11.4)
Ending balance		$ 746.7	$ 1,179.0

[1] There were no credit losses recorded in net earnings related to Level 3 assets still held as of March 31, 2020 and 2019.

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

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Net Investment Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Investment Income Net [Abstract]
Interest income	$ 119,300	$ 119,200
Dividend income	10,100	9,800
Investment expenses	(7,100)	(7,500)
Partnerships and other investment results	(10,300)	1,500
Net investment income	$ 111,982	$ 123,049

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Earnings Per Share of Common Stock (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

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

The following table presents a reconciliation of the earnings and share data used in the basic and diluted earnings per share computations for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions, except share amounts)
Net earnings available to Alleghany stockholders	$	(361.2	)	$	440.2
Effect of dilutive securities		(3.0	)		—
Income available to common stockholders for diluted earnings per share	$	(364.2	)	$	440.2
Weighted average common shares outstanding applicable to basic earnings per share		14,340,669			14,481,255
Effect of dilutive securities		15,439			3,981
Adjusted weighted average common shares outstanding applicable to diluted earnings per share		14,356,108			14,485,236
Contingently issuable shares(1)		18,703			39,325

(1) Contingently issuable shares were potentially available in the periods presented, but were not included in the diluted earnings per share computations because the impact was anti-dilutive to the earnings per share calculation.

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Investments (Tables)

3 Months Ended

Mar. 31, 2020

Investments [Abstract]

Amortized Cost and Fair Value of Available For Sale Securities

The following tables present the amortized cost and the fair value of AFS securities as of March 31, 2020 and December 31, 2019:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Allowance for Credit Losses(2)			Fair Value
	($ in millions)
As of March 31, 2020
Debt securities:
U.S. Government obligations	$	793.5	$	53.0	$	(0.2	)	$	—		$	846.3
Municipal bonds		2,158.3		117.2		(2.9	)		—			2,272.6
Foreign government obligations		669.1		27.6		(0.7	)		—			696.0
U.S. corporate bonds		3,386.8		103.5		(69.1	)		(26.5	)		3,394.7
Foreign corporate bonds		1,311.2		14.5		(32.7	)		(2.4	)		1,290.6
Mortgage and asset-backed securities:
RMBS		1,613.7		86.9		(0.2	)		(0.5	)		1,699.9
CMBS		870.6		15.9		(43.9	)		—			842.6
Other asset-backed securities(1)		2,517.6		5.6		(226.1	)		(2.0	)		2,295.1
Total debt securities		13,320.8		424.2		(375.8	)		(31.4	)		13,337.8
Short-term investments		536.1		—		—			—			536.1
Total investments	$	13,856.9	$	424.2	$	(375.8	)	$	(31.4	)	$	13,873.9

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in millions)
As of December 31, 2019
Debt securities:
U.S. Government obligations	$	1,198.5	$	19.3	$	(2.8	)	$	1,215.0
Municipal bonds		2,190.5		118.7		(1.3	)		2,307.9
Foreign government obligations		675.9		16.4		(1.6	)		690.7
U.S. corporate bonds		3,206.2		155.1		(2.3	)		3,359.0
Foreign corporate bonds		1,348.1		32.2		(2.9	)		1,377.4
Mortgage and asset-backed securities:
RMBS		1,785.1		56.1		(0.8	)		1,840.4
CMBS		849.9		23.2		(1.4	)		871.7
Other asset-backed securities(1)		2,544.5		24.8		(19.7	)		2,549.6
Total debt securities		13,798.7		445.8		(32.8	)		14,211.7
Short-term investments		914.8		—		—			914.8
Total investments	$	14,713.5	$	445.8	$	(32.8	)	$	15,126.5

(1) Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

(2) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

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

The following table presents the amortized cost and estimated fair value of debt securities by contractual maturity as of March 31, 2020. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	($ in millions)
As of March 31, 2020
Short-term investments due in one year or less	$	536.1	$	536.1
Mortgage and asset-backed securities(1)		5,001.9		4,837.6
Debt securities with maturity dates:
One year or less		432.8		432.3
Over one through five years		3,174.0		3,201.3
Over five through ten years		2,728.0		2,770.8
Over ten years		1,984.1		2,095.8
Total debt securities	$	13,320.8	$	13,337.8

(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 months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Interest income	$	119.3		$	119.2
Dividend income		10.1			9.8
Investment expenses		(7.1	)		(7.5	)
Partnerships and other investment results		(10.3	)		1.5
Total	$	112.0		$	123.0

Summary of Changes in Fair Value of Equity Securities

The following table presents changes in the fair value of equity securities for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Change in the fair value of equity securities sold during the period	$	(164.9	)	$	62.1
Change in the fair value of equity securities held at the end of the period		(358.1	)		330.3
Change in the fair value of equity securities	$	(523.0	)	$	392.4

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 months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Gross realized capital gains	$	59.0		$	12.1
Gross realized capital losses		(46.0	)		(7.7	)
Net realized capital gains	$	13.0		$	4.4

Allowance for Credit Losses on Available for Sale Securities

The following table presents a rollforward of Alleghany’s allowance for credit losses for AFS securities for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		—
Provision for credit losses		31.4
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	31.4

(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

Summary of Rating of Debt securities

The following table presents the ratings of Alleghany’s debt securities as of March 31, 2020:

	Ratings as of March 31, 2020
	AAA / Aaa			AA / Aa			A			BBB / Baa			Below BBB / Baa or Not Rated(1)			Total
	($ in millions)
U.S. Government obligations	$	—		$	846.3		$	—		$	—		$	—		$	846.3
Municipal bonds		184.2			1,526.5			489.4			71.6			0.9			2,272.6
Foreign government obligations		445.4			153.8			95.8			1.0			—			696.0
U.S. corporate bonds		9.0			158.0			1,586.4			1,298.2			343.1			3,394.7
Foreign corporate bonds		225.2			95.9			607.4			325.9			36.2			1,290.6
Mortgage and asset-backed securities:
RMBS		2.5			1,692.3			—			1.0			4.1			1,699.9
CMBS		283.6			400.8			157.8			0.4			—			842.6
Other asset-backed securities		961.8			513.6			457.9			274.6			87.2			2,295.1
Total debt securities	$	2,111.7		$	5,387.2		$	3,394.7		$	1,972.7		$	471.5		$	13,337.8
Percentage of debt securities, before allowance for credit losses		15.8	%		40.4	%		25.5	%		14.8	%		3.5	%		100.0	%

(1) Consists of $109.3 million of securities rated BB / Ba, $187.5 million of securities rated B, $26.2 million of securities rated CCC, $0.4 million of securities rated CC, $2.1 million of securities rated below CC and $146.0 million of not rated securities.

Gross Unrealized Losses and Related Fair Values for AFS Securities for which an Allowance for Credit Losses has Not Been Recorded Grouped by Duration of Time in Continuous Unrealized Loss Position

The following tables present gross unrealized losses and related fair values for Alleghany’s AFS securities for which an allowance for credit losses has not been recorded, grouped by duration of time in a continuous unrealized loss position, as of March 31, 2020 and December 31, 2019:

	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 March 31, 2020
Debt securities:
U.S. Government obligations	$	8.7	$	0.2	$	—	$	—	$	8.7	$	0.2
Municipal bonds		129.4		2.9		0.1		—		129.5		2.9
Foreign government obligations		76.5		0.7		—		—		76.5		0.7
U.S. corporate bonds		1,023.5		68.5		3.6		0.6		1,027.1		69.1
Foreign corporate bonds		656.5		32.6		17.4		0.1		673.9		32.7
Mortgage and asset-backed securities:
RMBS		15.2		0.2		0.4		—		15.6		0.2
CMBS		436.4		43.9		0.2		—		436.6		43.9
Other asset-backed securities		1,529.0		139.5		491.3		86.6		2,020.3		226.1
Total temporarily impaired securities	$	3,875.2	$	288.5	$	513.0	$	87.3	$	4,388.2	$	375.8

	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, 2019
Debt securities:
U.S. Government obligations	$	120.3	$	2.0	$	99.7	$	0.8	$	220.0	$	2.8
Municipal bonds		90.2		1.3		4.3		—		94.5		1.3
Foreign government obligations		198.5		1.2		33.8		0.4		232.3		1.6
U.S. corporate bonds		113.8		1.6		27.6		0.7		141.4		2.3
Foreign corporate bonds		212.0		2.3		66.9		0.6		278.9		2.9
Mortgage and asset-backed securities:
RMBS		48.7		0.3		48.6		0.5		97.3		0.8
CMBS		126.8		1.4		1.2		—		128.0		1.4
Other asset-backed securities		422.9		2.7		715.9		17.0		1,138.8		19.7
Total temporarily impaired securities	$	1,333.2	$	12.8	$	998.0	$	20.0	$	2,331.2	$	32.8

Allowance for Credit Losses on Commercial Mortgage Loans

The following table presents a rollforward of Alleghany’s allowance for credit losses on commercial mortgage loans for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		0.8
Provision for credit losses(2)		1.2
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	2.0

(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

(2) Primarily reflects an increase in the estimate of expected credit losses based on current conditions and reasonable and supportable forecasts as of March 31, 2020 arising from the Pandemic, as defined in Note 9(a) of this Form 10-Q.

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Summary of Rating of Debt securities (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020		Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	$ 13,337,754	[1]	$ 14,211,745
BB / Ba
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	109,300
B
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	187,500
CCC
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	26,200
CC
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	400
Below CC
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	2,100
Not rated securities
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	$ 146,000

[1] Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

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Reinsurance Recoverables, Recorded After Allowance for Credit Losses (Detail) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Insurance [Abstract]
Reinsurance recoverables on paid losses		$ 75,900	$ 98,100
Ceded outstanding loss and LAE	[1]	1,559,500	1,583,900	$ 1,642,800	$ 1,857,400
Reinsurance recoverables, before allowance for credit losses		1,635,400	1,682,000
Allowance for credit losses		(6,800)
Total		$ 1,628,649	$ 1,681,962

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

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Summary of Alleghany Capital Non-Insurance Revenue (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Segments | Alleghany Capital Corporation Segment | Non-Industrial Segment | Transferred over Time
Other Revenues [Line Items]
Noninsurance revenue percentage	82.00%	66.00%

XML

Segments of Business - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020 Segment
Segment Reporting Information [Line Items]
Number of reportable segments	3
Wilbert Funeral Services, Inc
Segment Reporting Information [Line Items]
Equity interest percentage	45.00%

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Segments of Business (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Results for Reportable Segments and Corporate Activities

The following tables present segment results for Alleghany’s three reportable segments and for corporate activities for the three months ended March 31, 2020 and 2019:

		Reinsurance Segment									Insurance Segment
Three Months Ended March 31, 2020		Property			Casualty & other (1)			Total			RSUI		Cap Specialty			Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities			Consolidated
	($ in millions)
Gross premiums written		$	412.6		$	914.9		$	1,327.5		$	365.9	$	85.5		$	451.4	$	1,778.9		$	—	$	1,778.9		$	(8.3	)	$	1,770.6
Net premiums written			312.9			898.1			1,211.0			244.5		78.2			322.7		1,533.7			—		1,533.7			—			1,533.7
Net premiums earned			321.4			811.7			1,133.1			229.4		81.9			311.3		1,444.4			—		1,444.4			—			1,444.4
Net loss and LAE			247.9			614.3			862.2			116.0		49.2			165.2		1,027.4			—		1,027.4			—			1,027.4
Commissions, brokerage and other    underwriting expenses			105.4			244.4			349.8			57.8		33.8			91.6		441.4			—		441.4			—			441.4
Underwriting (loss) profit(2)		$	(31.9	)	$	(47.0	)	$	(78.9	)	$	55.6	$	(1.1	)	$	54.5		(24.4	)		—		(24.4	)		—			(24.4	)
Net investment income																			109.7			1.8		111.5			0.5			112.0
Change in the fair value of equity securities																			(521.6	)		—		(521.6	)		(1.4	)		(523.0	)
Net realized capital gains																			45.1			4.9		50.0			(37.0	)		13.0
Credit losses for available for sale securities																			(30.7	)		—		(30.7	)		(0.7	)		(31.4	)
Noninsurance revenue																			7.4			457.3		464.7			3.2			467.9
Other operating expenses																			9.9			450.7		460.6			6.1			466.7
Corporate administration																			(2.0	)		—		(2.0	)		(12.3	)		(14.3	)
Amortization of intangible assets																			0.4			9.2		9.6			—			9.6
Interest expense																			6.7			3.8		10.5			7.8			18.3
Earnings (losses) before income taxes																		$	(429.5	)	$	0.3	$	(429.2	)	$	(37.0	)	$	(466.2	)

		Reinsurance Segment							Insurance Segment
Three Months Ended March 31, 2019		Property		Casualty & other (1)			Total		RSUI		Cap Specialty		Total		Subtotal			Alleghany Capital		Total Segments			Corporate Activities			Consolidated
	($ in millions)
Gross premiums written		$	415.1	$	816.5		$	1,231.6	$	299.0	$	82.8	$	381.8	$	1,613.4		$	—	$	1,613.4		$	(6.8	)	$	1,606.6
Net premiums written			316.2		791.4			1,107.6		201.4		76.7		278.1		1,385.7			—		1,385.7			—			1,385.7
Net premiums earned			308.9		720.3			1,029.2		192.4		75.7		268.1		1,297.3			—		1,297.3			—			1,297.3
Net loss and LAE			162.6		490.6			653.2		94.3		45.0		139.3		792.5			—		792.5			—			792.5
Commissions, brokerage and other    underwriting expenses			103.7		232.3			336.0		53.5		30.6		84.1		420.1			—		420.1			—			420.1
Underwriting (loss) profit(2)		$	42.6	$	(2.6	)	$	40.0	$	44.6	$	0.1	$	44.7		84.7			—		84.7			—			84.7
Net investment income																117.9			1.3		119.2			3.8			123.0
Change in the fair value of equity securities																389.1			—		389.1			3.3			392.4
Net realized capital gains																4.1			0.3		4.4			—			4.4
Credit losses for available for sale securities																(10.0	)		—		(10.0	)		—			(10.0	)
Noninsurance revenue																5.4			505.0		510.4			3.7			514.1
Other operating expenses																29.7			465.4		495.1			7.3			502.4
Corporate administration																1.1			—		1.1			18.3			19.4
Amortization of intangible assets																0.2			6.7		6.9			—			6.9
Interest expense																6.7			4.3		11.0			12.5			23.5
Earnings (losses) before income taxes															$	553.5		$	30.2	$	583.7		$	(27.3	)	$	556.4

(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; mortgage reinsurance; surety; and credit.

(2) Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, credit losses for available for sale securities, noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its reinsurance and insurance segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company’s ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.

Summary of Identifiable Assets and Equity

The following table presents identifiable assets, the portion of identifiable assets related to cash and invested assets and equity attributable to Alleghany for Alleghany’s reportable segments and for corporate activities as of March 31, 2020:

	Identifiable Assets		Invested Assets and Cash		Equity Attributable to Alleghany
	($ in millions)
Reinsurance segment	$	16,819.8	$	13,077.2	$	4,774.9
Insurance segment		6,414.1		4,697.6		2,377.5
Subtotal		23,233.9		17,774.8		7,152.4
Alleghany Capital		2,131.7		271.5		1,000.7
Total segments		25,365.6		18,046.3		8,153.1
Corporate activities		387.4		317.2		(296.0	)
Consolidated	$	25,753.0	$	18,363.5	$	7,857.1

Summary of Alleghany Capital Noninsurance Revenue

For Alleghany Capital’s industrial and non-industrial operations, noninsurance revenue consists of the sale of manufactured goods and services. The following table presents noninsurance revenue for the Alleghany Capital segment for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020		2019
	($ in millions)
Industrial(1)	$	242.5	$	260.1
Non-Industrial(2)		214.7		244.9
Corporate & other		0.1		—
Alleghany Capital	$	457.3	$	505.0

(1) For the three months ended March 31, 2020 and 2019, the vast majority of noninsurance revenue was recognized as goods and services transferred to customers over time.

(2) For the three months ended March 31, 2020 and 2019, approximately 82 percent 66 percent, respectively, of noninsurance revenue was recognized as services transferred to customers over time, with the remainder recognized as goods transferred at a point in time.

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Reinsurance Ceded (Tables)

3 Months Ended

Mar. 31, 2020

Insurance [Abstract]

Reinsurance Recoverables, Recorded After Allowance for Credit Losses

Amounts recoverable from reinsurers are recognized in a manner consistent with the loss and loss adjustment expense (“LAE”) liabilities associated with the reinsurance placement and presented on the balance sheet as reinsurance recoverables, and are recorded after an allowance for credit losses. Reinsurance recoverable balances as of March 31, 2020 and December 31, 2019 are presented in the table below:

	As of March 31,			As of December 31,
	2020			2019
	($ in millions)
Reinsurance recoverables on paid losses	$	75.9		$	98.1
Ceded outstanding loss and LAE		1,559.5			1,583.9
Reinsurance recoverables, before allowance for credit losses		1,635.4			1,682.0
Allowance for credit losses		(6.8	)		—
Total	$	1,628.6		$	1,682.0

Information Regarding Concentration of Reinsurance Recoverables and Ratings Profile of Our Reinsurers

The following table presents information regarding concentration of Alleghany’s reinsurance recoverables and the ratings profile of our reinsurers as of March 31, 2020:

Reinsurer(1)	Rating(2)	Amount			Percentage
	($ in millions)
Syndicates at Lloyd's of London	A (Excellent)	$	132.9			8.1	%
Kane SAC Ltd, Rondout Segregated Account(3)	not rated		121.8			7.4	%
PartnerRe Ltd	A (Excellent)		97.4			6.0	%
Fairfax Financial Holdings Ltd	A (Superior)		90.4			5.5	%
Swiss Reinsurance Company	A+ (Superior)		88.1			5.4	%
Third Point Reinsurance Group	A- (Excellent)		87.0			5.3	%
Kane SAC Ltd, Bowery Segregated Account(3)	not rated		77.4			4.7	%
RenaissanceRe Holdings Ltd	A+ (Superior)		75.4			4.6	%
W.R. Berkley Corporation	A+ (Superior)		67.7			4.1	%
Liberty Mutual	A (Excellent)		55.9			3.4	%
All other reinsurers			741.4			45.5	%
Total reinsurance recoverables, before allowance for credit losses(4)		$	1,635.4			100.0	%
Allowance for credit losses			(6.8	)
Total		$	1,628.6
Secured reinsurance recoverables(3)		$	659.6			40.3	%

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

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

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

(4) Approximately 66 percent of our reinsurance recoverables balance as of March 31, 2020 was due from reinsurers having an A.M. Best Company, Inc. financial strength rating of A (Excellent) or higher, with a majority of the other reinsurance recoverables being secured by funds held, trust agreements or letters of credit.

Allowance for Credit Losses on Reinsurance Recoverables

The following table presents a rollforward of Alleghany’s allowance for credit losses on reinsurance recoverables for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		3.3
Provision for credit losses(2)		3.5
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	6.8

(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

(2) Primarily reflects an increase in the estimate of expected credit losses based on current conditions and reasonable and supportable forecasts as of March 31, 2020 arising from the Pandemic, as defined in Note 9(a) of this Form 10-Q.

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Summary of Rating of Debt securities (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020		Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		$ 13,337,754	[1]	$ 14,211,745
Percentage of debt securities, before allowance for credit losses		100.00%
AAA / Aaa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		$ 2,111,700
Percentage of debt securities, before allowance for credit losses		15.80%
AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		$ 5,387,200
Percentage of debt securities, before allowance for credit losses		40.40%
A
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		$ 3,394,700
Percentage of debt securities, before allowance for credit losses		25.50%
BBB / Baa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		$ 1,972,700
Percentage of debt securities, before allowance for credit losses		14.80%
Below BBB / Baa or Not Rated
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	[2]	$ 471,500
Percentage of debt securities, before allowance for credit losses	[2]	3.50%
U.S. Government obligations
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		$ 846,300		1,215,000
U.S. Government obligations | AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		846,300
Municipal bonds
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		2,272,600		2,307,900
Municipal bonds | AAA / Aaa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		184,200
Municipal bonds | AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		1,526,500
Municipal bonds | A
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		489,400
Municipal bonds | BBB / Baa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		71,600
Municipal bonds | Below BBB / Baa or Not Rated
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	[2]	900
Foreign government obligations
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		696,000		690,700
Foreign government obligations | AAA / Aaa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		445,400
Foreign government obligations | AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		153,800
Foreign government obligations | A
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		95,800
Foreign government obligations | BBB / Baa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		1,000
U.S. corporate bonds
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		3,394,700		3,359,000
U.S. corporate bonds | AAA / Aaa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		9,000
U.S. corporate bonds | AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		158,000
U.S. corporate bonds | A
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		1,586,400
U.S. corporate bonds | BBB / Baa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		1,298,200
U.S. corporate bonds | Below BBB / Baa or Not Rated
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	[2]	343,100
Foreign corporate bonds
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		1,290,600		1,377,400
Foreign corporate bonds | AAA / Aaa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		225,200
Foreign corporate bonds | AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		95,900
Foreign corporate bonds | A
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		607,400
Foreign corporate bonds | BBB / Baa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		325,900
Foreign corporate bonds | Below BBB / Baa or Not Rated
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	[2]	36,200
RMBS
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	[3]	1,699,900		1,840,400
RMBS | AAA / Aaa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		2,500
RMBS | AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		1,692,300
RMBS | BBB / Baa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		1,000
RMBS | Below BBB / Baa or Not Rated
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	[2]	4,100
CMBS
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		842,600		871,700
CMBS | AAA / Aaa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		283,600
CMBS | AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		400,800
CMBS | A
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		157,800
CMBS | BBB / Baa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		400
Other asset-backed securities
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	[4]	2,295,100		$ 2,549,600
Other asset-backed securities | AAA / Aaa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		961,800
Other asset-backed securities | AA / Aa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		513,600
Other asset-backed securities | A
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		457,900
Other asset-backed securities | BBB / Baa
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities		274,600
Other asset-backed securities | Below BBB / Baa or Not Rated
Financing Receivable Allowance For Credit Losses [Line Items]
Debt securities	[2]	$ 87,200

[1] Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.

[2] Consists of $109.3 million of securities rated BB / Ba, $187.5 million of securities rated B, $26.2 million of securities rated CCC, $0.4 million of securities rated CC, $2.1 million of securities rated below CC and $146.0 million of not rated securities.

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

[4] Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

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Reinsurance Ceded - Additional Information (Detail) - Reinsurance Segment	3 Months Ended
	Mar. 31, 2020
Effects Of Reinsurance [Line Items]
Retrocession protection term	1 year
Term of catastrophe bonds	4 years

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Debt - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended
	Jan. 15, 2020	Sep. 20, 2010	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Interest paid			$ 17,065	$ 19,368
Loss on early redemption of debt			(7,100)
Senior Notes and other debt			1,514,381		$ 1,751,113
Operating Segments | Alleghany Capital Corporation Segment
Debt Instrument [Line Items]
Senior Notes and other debt			$ 429,800		367,100
Alleghany Corporation | 2020 Senior Notes
Debt Instrument [Line Items]
Senior notes, face value		$ 300,000
Senior notes, maturity date		Sep. 15, 2020
Senior notes, frequency of interest payment			Interest on the 2020 Senior Notes was payable semi-annually on March 15 and September 15 of each year.
Senior notes, interest rate		5.625%
Senior notes, issuance rate		99.60%
Proceeds from issuance of Senior notes		$ 298,900
Senior notes, effective yield		5.67%
Cost of senior note redemption	$ 312,700
Aggregate principal amount redeemed	300,000
Redemption premium	7,100
Interest paid	$ 5,600
Loss on early redemption of debt			$ (7,100)
Jazwares, LLC | Operating Segments | Alleghany Capital Corporation Segment
Debt Instrument [Line Items]
Senior Notes and other debt			161,600
WWSC Holdings, LLC | Operating Segments | Alleghany Capital Corporation Segment
Debt Instrument [Line Items]
Senior Notes and other debt			105,800
Kentucky Trailer | Operating Segments | Alleghany Capital Corporation Segment
Debt Instrument [Line Items]
Senior Notes and other debt			74,200
Integrated Project Services LLC | Operating Segments | Alleghany Capital Corporation Segment
Debt Instrument [Line Items]
Senior Notes and other debt			51,200
Precision Cutting Technologies, Inc | Operating Segments | Alleghany Capital Corporation Segment
Debt Instrument [Line Items]
Senior Notes and other debt			$ 37,000
Concord | Operating Segments | Alleghany Capital Corporation Segment | Floating Rate Debt Funded by Alleghany Corporation
Debt Instrument [Line Items]
Senior Notes and other debt					$ 33,000

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Results for Reportable Segments and Corporate Activities (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Gross premiums written		$ 1,770,600	$ 1,606,600
Net premiums written		1,533,700	1,385,700
Net premiums earned		1,444,420	1,297,309
Net loss and LAE		1,027,444	792,498
Commissions, brokerage and other underwriting expenses		441,396	420,126
Underwriting (loss) profit	[1]	(24,400)	84,700
Net investment income		111,982	123,049
Change in the fair value of equity securities		(522,976)	392,353
Net realized capital gains		13,026	4,442
Credit losses for available for sale securities		(31,375)
Credit losses for available for sale securities			(10,020)
Noninsurance revenue		467,849	514,123
Other operating expenses		466,661	502,418
Corporate administration		(14,307)	19,369
Amortization of intangible assets		9,568	6,900
Interest expense		18,356	23,531
(Losses) earnings before income taxes		(466,192)	556,414
Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written		1,778,900	1,613,400
Net premiums written		1,533,700	1,385,700
Net premiums earned		1,444,400	1,297,300
Net loss and LAE		1,027,400	792,500
Commissions, brokerage and other underwriting expenses		441,400	420,100
Underwriting (loss) profit	[1]	(24,400)	84,700
Net investment income		111,500	119,200
Change in the fair value of equity securities		(521,600)	389,100
Net realized capital gains		50,000	4,400
Credit losses for available for sale securities		(30,700)
Credit losses for available for sale securities			(10,000)
Noninsurance revenue		464,700	510,400
Other operating expenses		460,600	495,100
Corporate administration		(2,000)	1,100
Amortization of intangible assets		9,600	6,900
Interest expense		10,500	11,000
(Losses) earnings before income taxes		(429,200)	583,700
Operating Segments | Reinsurance Segment
Segment Reporting Information [Line Items]
Gross premiums written		1,327,500	1,231,600
Net premiums written		1,211,000	1,107,600
Net premiums earned		1,133,100	1,029,200
Net loss and LAE		862,200	653,200
Commissions, brokerage and other underwriting expenses		349,800	336,000
Underwriting (loss) profit	[1]	(78,900)	40,000
Operating Segments | Reinsurance Segment | Property
Segment Reporting Information [Line Items]
Gross premiums written		412,600	415,100
Net premiums written		312,900	316,200
Net premiums earned		321,400	308,900
Net loss and LAE		247,900	162,600
Commissions, brokerage and other underwriting expenses		105,400	103,700
Underwriting (loss) profit	[1]	(31,900)	42,600
Operating Segments | Reinsurance Segment | Casualty & Other
Segment Reporting Information [Line Items]
Gross premiums written	[2]	914,900	816,500
Net premiums written	[2]	898,100	791,400
Net premiums earned	[2]	811,700	720,300
Net loss and LAE	[2]	614,300	490,600
Commissions, brokerage and other underwriting expenses	[2]	244,400	232,300
Underwriting (loss) profit	[1],[2]	(47,000)	(2,600)
Operating Segments | Insurance Segment
Segment Reporting Information [Line Items]
Gross premiums written		451,400	381,800
Net premiums written		322,700	278,100
Net premiums earned		311,300	268,100
Net loss and LAE		165,200	139,300
Commissions, brokerage and other underwriting expenses		91,600	84,100
Underwriting (loss) profit	[1]	54,500	44,700
Operating Segments | Insurance Segment | RSUI
Segment Reporting Information [Line Items]
Gross premiums written		365,900	299,000
Net premiums written		244,500	201,400
Net premiums earned		229,400	192,400
Net loss and LAE		116,000	94,300
Commissions, brokerage and other underwriting expenses		57,800	53,500
Underwriting (loss) profit	[1]	55,600	44,600
Operating Segments | Insurance Segment | CapSpecialty Incorporated
Segment Reporting Information [Line Items]
Gross premiums written		85,500	82,800
Net premiums written		78,200	76,700
Net premiums earned		81,900	75,700
Net loss and LAE		49,200	45,000
Commissions, brokerage and other underwriting expenses		33,800	30,600
Underwriting (loss) profit	[1]	(1,100)	100
Operating Segments | Reinsurance Segment and Insurance Segment
Segment Reporting Information [Line Items]
Gross premiums written		1,778,900	1,613,400
Net premiums written		1,533,700	1,385,700
Net premiums earned		1,444,400	1,297,300
Net loss and LAE		1,027,400	792,500
Commissions, brokerage and other underwriting expenses		441,400	420,100
Underwriting (loss) profit	[1]	(24,400)	84,700
Net investment income		109,700	117,900
Change in the fair value of equity securities		(521,600)	389,100
Net realized capital gains		45,100	4,100
Credit losses for available for sale securities		(30,700)
Credit losses for available for sale securities			(10,000)
Noninsurance revenue		7,400	5,400
Other operating expenses		9,900	29,700
Corporate administration		(2,000)	1,100
Amortization of intangible assets		400	200
Interest expense		6,700	6,700
(Losses) earnings before income taxes		(429,500)	553,500
Operating Segments | Alleghany Capital Corporation Segment
Segment Reporting Information [Line Items]
Net investment income		1,800	1,300
Net realized capital gains		4,900	300
Noninsurance revenue		457,300	505,000
Other operating expenses		450,700	465,400
Amortization of intangible assets		9,200	6,700
Interest expense		3,800	4,300
(Losses) earnings before income taxes		300	30,200
Corporate activities
Segment Reporting Information [Line Items]
Gross premiums written		(8,300)	(6,800)
Net investment income		500	3,800
Change in the fair value of equity securities		(1,400)	3,300
Net realized capital gains		(37,000)
Credit losses for available for sale securities		(700)
Noninsurance revenue		3,200	3,700
Other operating expenses		6,100	7,300
Corporate administration		(12,300)	18,300
Interest expense		7,800	12,500
(Losses) earnings before income taxes		$ (37,000)	$ (27,300)

[1] Underwriting profit represents net premiums earned less net loss and LAE and commissions, brokerage and other underwriting expenses, all as determined in accordance with GAAP, and does not include net investment income, change in the fair value of equity securities, net realized capital gains, credit losses for available for sale securities, noninsurance revenue, other operating expenses, corporate administration, amortization of intangible assets or interest expense. Underwriting profit does not replace earnings before income taxes determined in accordance with GAAP as a measure of profitability. Rather, Alleghany believes that underwriting profit enhances the understanding of its reinsurance and insurance segments’ operating results by highlighting net earnings attributable to their underwriting performance. Earnings before income taxes (a GAAP measure) may show a profit despite an underlying underwriting loss. Where underwriting losses persist over extended periods, a reinsurance or an insurance company’s ability to continue as an ongoing concern may be at risk. Therefore, Alleghany views underwriting profit as an important measure in the overall evaluation of performance.

[2] Primarily consists of the following 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; mortgage reinsurance; surety; and credit.

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Reclassifications of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized capital gains		$ (13,026)	$ (4,442)
Credit losses for available for sale securities		31,375
Credit losses for available for sale securities			10,020
Income taxes		(104,720)	108,512
Unrealized Appreciation of Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications		(10,900)	4,400
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]	(45,100)	(4,400)
Credit losses for available for sale securities		31,400
Credit losses for available for sale securities			10,000
Income taxes		$ 2,800	$ (1,200)

[1] For the three months ended March 31, 2020, excludes a $7.1 million realized loss as a result of an early redemption of debt (see Note 11(a) of this Form 10-Q for further information), a $30.0 million impairment charge from a write-down of certain SORC assets and a $5.0 million realized gain from a reduction of certain contingent consideration liabilities (see Note 3(e) of this Form 10-Q for additional information).

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense (benefit) related to CARES Act 2020	$ 6.9
Effective income tax rate	22.40%	19.50%
Interest or penalties accrued for uncertain tax positions	$ 0.0

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Stockholders' Equity

3 Months Ended

Mar. 31, 2020

Stockholders Equity Note [Abstract]

Stockholders' Equity

7. Stockholders’ Equity

(a) Common Stock Repurchases

In June 2018, the Alleghany Board of Directors authorized the repurchase of shares of common stock of Alleghany, par value $1.00 per share (“Common Stock”), at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million. In September 2019, the Alleghany Board of Directors authorized, upon the completion of the program authorized in 2018, the repurchase of additional shares of Common Stock, at such times and at prices as management determines to be advisable, up to an aggregate of $500.0 million.  As of March 31, 2020, Alleghany had $582.9 million remaining under its share repurchase authorizations.

The following table presents the shares of Common Stock that Alleghany repurchased in the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020		2019
Shares repurchased		62,540		129,567
Cost of shares repurchased (in millions)	$	44.3	$	80.5
Average price per share repurchased	$	707.84	$	621.19

(b) Accumulated Other Comprehensive Income (Loss)

The following tables present a reconciliation of the changes during the three months ended March 31, 2020 and 2019 in accumulated other comprehensive income (loss) attributable to Alleghany stockholders:

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2020	$	321.0		$	(121.8	)	$	(27.9	)	$	171.3
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		(276.6	)		(13.7	)		0.5			(289.8	)
Reclassifications from accumulated other comprehensive income		(10.9	)		—			—			(10.9	)
Total		(287.5	)		(13.7	)		0.5			(300.7	)
Balance as of March 31, 2020	$	33.5		$	(135.5	)	$	(27.4	)	$	(129.4	)

	Unrealized Appreciation of Investments			Unrealized Currency Translation Adjustment			Retirement Plans			Total
	($ in millions)
Balance as of January 1, 2019	$	(61.6	)	$	(124.7	)	$	(15.7	)	$	(202.0	)
Other comprehensive income (loss), net of tax:
Other comprehensive income (loss) before reclassifications		183.4			(0.9	)		0.9			183.4
Reclassifications from accumulated other comprehensive income		4.4			—			—			4.4
Total		187.8			(0.9	)		0.9			187.8
Balance as of March 31, 2019	$	126.2		$	(125.6	)	$	(14.8	)	$	(14.2	)

The following table presents reclassifications out of accumulated other comprehensive income (loss) attributable to Alleghany stockholders during the three months ended March 31, 2020 and 2019:

Accumulated Other		Three Months Ended March 31,
Comprehensive Income Component	Line in Consolidated Statement of Earnings	2020			2019
		($ in millions)
Unrealized appreciation of investments:	Net realized capital gains(1)	$	(45.1	)	$	(4.4	)
	Credit losses for available for sale securities		31.4			10.0
	Income taxes		2.8			(1.2	)
Total reclassifications:	Net (earnings) losses	$	(10.9	)	$	4.4

(1) For the three months ended March 31, 2020, excludes a $7.1 million realized loss as a result of an early redemption of debt (see Note 11(a) of this Form 10-Q for further information), a $30.0 million impairment charge from a write-down of certain SORC assets and a $5.0 million realized gain from a reduction of certain contingent consideration liabilities (see Note 3(e) of this Form 10-Q for additional information).

(c) Special Dividend

In February 2020, the Alleghany Board of Directors declared a special dividend of $15.00 per share for stockholders of record on March 5, 2020. On March 15, 2020, Alleghany paid dividends to stockholders totaling $215.0 million.

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net (losses) earnings	$ (361,472)	$ 447,902
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	33,158	27,732
Change in the fair value of equity securities	522,976	(392,353)
Net realized capital (gains) losses	(13,026)	(4,442)
Credit losses for available for sale securities	31,375
Credit losses for available for sale securities		10,020
(Increase) decrease in reinsurance recoverables, net of reinsurance payable	49,693	165,434
(Increase) decrease in premium balances receivable	(143,970)	(103,538)
(Increase) decrease in ceded unearned premiums	(18,020)	(9,849)
(Increase) decrease in deferred acquisition costs	(18,463)	(23,537)
(Increase) decrease in funds held under reinsurance agreements	(23,757)	19,984
Increase (decrease) in unearned premiums	102,239	101,816
Increase (decrease) in loss and loss adjustment expenses	138,079	(395,170)
Change in unrealized foreign currency exchange rate losses (gains)	80,530	1,070
Other, net	(386,627)	88,546
Net adjustments	354,187	(514,287)
Net cash provided by (used in) operating activities	(7,285)	(66,385)
Cash flows from investing activities
Purchases of debt securities	(1,993,449)	(2,460,366)
Purchases of equity securities	(331,453)	(69,729)
Sales of debt securities	1,960,691	987,132
Maturities and redemptions of debt securities	459,655	235,521
Sales of equity securities	602,627	1,510,222
Net (purchases) sales of short-term investments	378,854	(376,414)
Net (purchases) sales and maturities of commercial mortgage loans	3,551	29
(Purchases) sales of property and equipment	(8,840)	(12,956)
Purchases of affiliates and subsidiaries, net of cash acquired	(26,383)	1,157
Other, net	(152,416)	73,423
Net cash provided by (used in) investing activities	892,837	(111,981)
Cash flows from financing activities
Repayment of senior notes	(307,095)
Treasury stock acquisitions	(44,268)	(80,486)
Increase (decrease) in other debt	62,659	8,178
Cash dividends paid	(215,013)
Other, net	3,664	(11,421)
Net cash provided by (used in) financing activities	(500,053)	(83,729)
Effect of foreign exchange rate changes on cash	(9,412)	1,396
Net increase (decrease) in cash	376,087	(260,699)
Cash at beginning of period	1,179,098	1,038,763
Cash at end of period	1,555,185	778,064
Supplemental disclosures of cash flow information
Interest paid	17,065	19,368
Income taxes paid (refund received)	$ 24,604	$ (39,657)

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Investments

3 Months Ended

Mar. 31, 2020

Investments [Abstract]

Investments

3. Investments

(a) Unrealized Gains and Losses

The following tables present the amortized cost and the fair value of AFS securities as of March 31, 2020 and December 31, 2019:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Allowance for Credit Losses(2)			Fair Value
	($ in millions)
As of March 31, 2020
Debt securities:
U.S. Government obligations	$	793.5	$	53.0	$	(0.2	)	$	—		$	846.3
Municipal bonds		2,158.3		117.2		(2.9	)		—			2,272.6
Foreign government obligations		669.1		27.6		(0.7	)		—			696.0
U.S. corporate bonds		3,386.8		103.5		(69.1	)		(26.5	)		3,394.7
Foreign corporate bonds		1,311.2		14.5		(32.7	)		(2.4	)		1,290.6
Mortgage and asset-backed securities:
RMBS		1,613.7		86.9		(0.2	)		(0.5	)		1,699.9
CMBS		870.6		15.9		(43.9	)		—			842.6
Other asset-backed securities(1)		2,517.6		5.6		(226.1	)		(2.0	)		2,295.1
Total debt securities		13,320.8		424.2		(375.8	)		(31.4	)		13,337.8
Short-term investments		536.1		—		—			—			536.1
Total investments	$	13,856.9	$	424.2	$	(375.8	)	$	(31.4	)	$	13,873.9

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in millions)
As of December 31, 2019
Debt securities:
U.S. Government obligations	$	1,198.5	$	19.3	$	(2.8	)	$	1,215.0
Municipal bonds		2,190.5		118.7		(1.3	)		2,307.9
Foreign government obligations		675.9		16.4		(1.6	)		690.7
U.S. corporate bonds		3,206.2		155.1		(2.3	)		3,359.0
Foreign corporate bonds		1,348.1		32.2		(2.9	)		1,377.4
Mortgage and asset-backed securities:
RMBS		1,785.1		56.1		(0.8	)		1,840.4
CMBS		849.9		23.2		(1.4	)		871.7
Other asset-backed securities(1)		2,544.5		24.8		(19.7	)		2,549.6
Total debt securities		13,798.7		445.8		(32.8	)		14,211.7
Short-term investments		914.8		—		—			914.8
Total investments	$	14,713.5	$	445.8	$	(32.8	)	$	15,126.5

(1) Includes $732.3 million and $834.2 million of collateralized loan obligations as of March 31, 2020 and December 31, 2019, respectively.

(2) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

(b) Contractual Maturity

The following table presents the amortized cost and estimated fair value of debt securities by contractual maturity as of March 31, 2020. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	($ in millions)
As of March 31, 2020
Short-term investments due in one year or less	$	536.1	$	536.1
Mortgage and asset-backed securities(1)		5,001.9		4,837.6
Debt securities with maturity dates:
One year or less		432.8		432.3
Over one through five years		3,174.0		3,201.3
Over five through ten years		2,728.0		2,770.8
Over ten years		1,984.1		2,095.8
Total debt securities	$	13,320.8	$	13,337.8

(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 months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Interest income	$	119.3		$	119.2
Dividend income		10.1			9.8
Investment expenses		(7.1	)		(7.5	)
Partnerships and other investment results		(10.3	)		1.5
Total	$	112.0		$	123.0

As of March 31, 2020, non-income producing invested assets were immaterial.

(d) Change in the Fair Value of Equity Securities

The following table presents changes in the fair value of equity securities for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Change in the fair value of equity securities sold during the period	$	(164.9	)	$	62.1
Change in the fair value of equity securities held at the end of the period		(358.1	)		330.3
Change in the fair value of equity securities	$	(523.0	)	$	392.4

(e) Realized Gains and Losses

The proceeds from sales of debt and equity securities were $2.6 billion and $2.5 billion for the three months ended March 31, 2020 and 2019, respectively.

Realized capital gains and losses for the three months ended March 31, 2020 and 2019 primarily reflect the sale of debt securities and, for the three months ended March 31, 2020, a $30.0 million impairment charge from a write-down of certain SORC assets arising from a significant decline in energy prices as of March 31, 2020. Realized capital gains and losses for the three months ended March 31, 2020 also include a $5.0 million realized gain from a reduction of certain contingent consideration liabilities at the PCT-level in connection with its acquisition of a provider of high-performance solid carbide end mills in June 2019, and a $7.1 million realized loss as a result of an early redemption of debt (see Note 11(a) of this Form 10-Q for further information on this early redemption).

The following table presents amounts of gross realized capital gains and gross realized capital losses for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	($ in millions)
Gross realized capital gains	$	59.0		$	12.1
Gross realized capital losses		(46.0	)		(7.7	)
Net realized capital gains	$	13.0		$	4.4

Gross realized capital losses exclude credit losses for AFS securities, as discussed below.

(f) Credit quality for AFS securities

Alleghany holds its debt securities as AFS and, as such, these securities are recorded at fair value. Credit losses for AFS securities are recorded through an allowance for credit losses. Changes in the allowance for credit losses are recorded for (or as a reversal of) credit losses for AFS securities.  Any portion of a decline in fair value 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.

Alleghany continually monitors the difference between amortized cost and the estimated fair value of its debt investments. The analysis of a security’s decline in value is performed in its functional currency.  Debt securities in an unrealized loss position are evaluated for credit losses if they meet any of the following criteria: (i) they are trading at a discount of at least 20 percent to amortized cost and have a credit rating below investment grade or are not rated; (ii) there has been a negative credit or news event with respect to the issuer that could indicate the existence of a credit loss; 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 a credit 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 a credit 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 total 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.

Credit losses for AFS securities in the first three months of 2020 reflect $31.4 million of unrealized losses on debt securities, primarily related to the energy sector and lower-quality corporate bonds in other sectors due to a significant decline in their fair value relative to their amortized costs.

Credit losses for AFS securities in the first three months of 2019 reflect $10.0 million of unrealized losses on debt securities, primarily related to the energy sector and the deterioration of creditworthiness of the issuers.

The following table presents a rollforward of Alleghany’s allowance for credit losses for AFS securities for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		—
Provision for credit losses		31.4
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	31.4

(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

The gross unrealized investment losses for debt securities as of March 31, 2020 were deemed to be temporary, based on, among other factors: (i) the relative magnitude to which the fair value of these investments had been below cost were not indicative of a credit 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’s methodology for assessing credit losses 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.

Alleghany’s consolidated investment portfolio 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 three large, reputable rating agencies. In this regard, the overall weighted-average credit quality rating of Alleghany’s debt securities portfolio as of March 31, 2020 and December 31, 2019, was AA-. Although a portion of Alleghany’s debt securities, which consist predominantly of municipal bonds, is 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 March 31, 2020. The following table presents the ratings of Alleghany’s debt securities as of March 31, 2020:

	Ratings as of March 31, 2020
	AAA / Aaa			AA / Aa			A			BBB / Baa			Below BBB / Baa or Not Rated(1)			Total
	($ in millions)
U.S. Government obligations	$	—		$	846.3		$	—		$	—		$	—		$	846.3
Municipal bonds		184.2			1,526.5			489.4			71.6			0.9			2,272.6
Foreign government obligations		445.4			153.8			95.8			1.0			—			696.0
U.S. corporate bonds		9.0			158.0			1,586.4			1,298.2			343.1			3,394.7
Foreign corporate bonds		225.2			95.9			607.4			325.9			36.2			1,290.6
Mortgage and asset-backed securities:
RMBS		2.5			1,692.3			—			1.0			4.1			1,699.9
CMBS		283.6			400.8			157.8			0.4			—			842.6
Other asset-backed securities		961.8			513.6			457.9			274.6			87.2			2,295.1
Total debt securities	$	2,111.7		$	5,387.2		$	3,394.7		$	1,972.7		$	471.5		$	13,337.8
Percentage of debt securities, before allowance for credit losses		15.8	%		40.4	%		25.5	%		14.8	%		3.5	%		100.0	%

(1) Consists of $109.3 million of securities rated BB / Ba, $187.5 million of securities rated B, $26.2 million of securities rated CCC, $0.4 million of securities rated CC, $2.1 million of securities rated below CC and $146.0 million of not rated securities.

(g) Aging of Gross Unrealized Losses

The following tables present gross unrealized losses and related fair values for Alleghany’s AFS securities for which an allowance for credit losses has not been recorded, grouped by duration of time in a continuous unrealized loss position, as of March 31, 2020 and December 31, 2019:

	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 March 31, 2020
Debt securities:
U.S. Government obligations	$	8.7	$	0.2	$	—	$	—	$	8.7	$	0.2
Municipal bonds		129.4		2.9		0.1		—		129.5		2.9
Foreign government obligations		76.5		0.7		—		—		76.5		0.7
U.S. corporate bonds		1,023.5		68.5		3.6		0.6		1,027.1		69.1
Foreign corporate bonds		656.5		32.6		17.4		0.1		673.9		32.7
Mortgage and asset-backed securities:
RMBS		15.2		0.2		0.4		—		15.6		0.2
CMBS		436.4		43.9		0.2		—		436.6		43.9
Other asset-backed securities		1,529.0		139.5		491.3		86.6		2,020.3		226.1
Total temporarily impaired securities	$	3,875.2	$	288.5	$	513.0	$	87.3	$	4,388.2	$	375.8

	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, 2019
Debt securities:
U.S. Government obligations	$	120.3	$	2.0	$	99.7	$	0.8	$	220.0	$	2.8
Municipal bonds		90.2		1.3		4.3		—		94.5		1.3
Foreign government obligations		198.5		1.2		33.8		0.4		232.3		1.6
U.S. corporate bonds		113.8		1.6		27.6		0.7		141.4		2.3
Foreign corporate bonds		212.0		2.3		66.9		0.6		278.9		2.9
Mortgage and asset-backed securities:
RMBS		48.7		0.3		48.6		0.5		97.3		0.8
CMBS		126.8		1.4		1.2		—		128.0		1.4
Other asset-backed securities		422.9		2.7		715.9		17.0		1,138.8		19.7
Total temporarily impaired securities	$	1,333.2	$	12.8	$	998.0	$	20.0	$	2,331.2	$	32.8

As of March 31, 2020, Alleghany held a total of 1,672 debt securities that were in an unrealized loss position, of which 126 securities were in an unrealized loss position continuously for 12 months or more. The unrealized losses associated with these debt securities consisted of losses related primarily to other asset-backed securities, U.S. corporate bonds and CMBS.  

(h) Investments in Variable Interest Entities

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 March 31, 2020, Alleghany’s carrying value in the Pillar Investments, as determined under the equity method of accounting, was $194.7 million, which is reported as a component of other invested assets and is net of returns of capital received from the Pillar Investments.

(i) Investments in Commercial Mortgage Loans

As of March 31, 2020, the carrying value of Alleghany’s commercial mortgage loan portfolio was $682.7 million, representing the unpaid principal balance on the loans, less allowance for credit losses. The estimated fair value of the commercial mortgage loan portfolio approximated carrying value as of March 31, 2020 and December 31, 2019. 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, and mature in two to ten years from loan origination. As of March 31, 2020, the vast majority of loans in Alleghany’s portfolio were originated in the 2016 through 2019 years.

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 and the estimated fair value of underlying collateral was approximately double that of the commercial mortgage loan portfolio carrying value as of March 31, 2020.  Fair value estimates of underlying collateral are updated on a rolling basis annually, with a portion of the portfolio updated each quarter. As of March 31, 2020, there was no loan in default or in arrears.

The following table presents a rollforward of Alleghany’s allowance for credit losses on commercial mortgage loans for the three months ended March 31, 2020:

	For the Three Months Ended March 31, 2020
Allowance for Credit Losses	($ in millions)
Balance as of January 1, 2020	$	—
Balance as of January 1, 2020 - cumulative effect of an accounting change(1)		0.8
Provision for credit losses(2)		1.2
Charge-offs		—
Recoveries		—
Balance as of March 31, 2020	$	2.0

(1) See Note 1(c) of this Form 10-Q for further information regarding Alleghany’s adoption of new credit loss accounting guidance.

(2) Primarily reflects an increase in the estimate of expected credit losses based on current conditions and reasonable and supportable forecasts as of March 31, 2020 arising from the Pandemic, as defined in Note 9(a) of this Form 10-Q.

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Consolidated Statements of Earnings and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues
Net premiums earned	$ 1,444,420	$ 1,297,309
Net investment income	111,982	123,049
Change in the fair value of equity securities	(522,976)	392,353
Net realized capital gains	13,026	4,442
Credit losses for available for sale securities	(31,375)
Credit losses for available for sale securities		(10,020)
Noninsurance revenue	467,849	514,123
Total revenues	1,482,926	2,321,256
Costs and Expenses
Net loss and loss adjustment expenses	1,027,444	792,498
Commissions, brokerage and other underwriting expenses	441,396	420,126
Other operating expenses	466,661	502,418
Corporate administration	(14,307)	19,369
Amortization of intangible assets	9,568	6,900
Interest expense	18,356	23,531
Total costs and expenses	1,949,118	1,764,842
(Losses) earnings before income taxes	(466,192)	556,414
Income taxes	(104,720)	108,512
Net (losses) earnings	(361,472)	447,902
Net (losses) earnings attributable to noncontrolling interest	(254)	7,675
Net (losses) earnings attributable to Alleghany stockholders	(361,218)	440,227
Net (losses) earnings	(361,472)	447,902
Other comprehensive income (loss):
Change in unrealized gains, net of deferred taxes	(276,629)	183,387
Less: reclassification for net realized capital gains and credit losses for available for sale securities, net of taxes	(10,848)	4,407
Change in unrealized currency translation adjustment, net of deferred taxes	(13,733)	(885)
Retirement plans	517	937
Comprehensive (loss) income	(662,165)	635,748
Comprehensive (loss) income attributable to noncontrolling interests	(254)	7,675
Comprehensive (loss) income attributable to Alleghany stockholders	$ (661,911)	$ 628,073
Basic (losses) earnings per share attributable to Alleghany stockholders	$ (25.19)	$ 30.40
Diluted (losses) earnings per share attributable to Alleghany stockholders	$ (25.37)	$ 30.39

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Debt

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Debt

11. Debt

(a) Senior Notes

On September 20, 2010, Alleghany completed a public offering of $300.0 million aggregate principal amount of its 5.625% senior notes due on September 15, 2020 (the “2020 Senior Notes”). The 2020 Senior Notes were unsecured and unsubordinated general obligations of Alleghany. Interest on the 2020 Senior Notes was payable semi-annually on March 15 and September 15 of each year. The terms of the 2020 Senior Notes permitted redemption prior to their maturity. The indenture under which the 2020 Senior Notes were issued contains covenants that impose conditions on Alleghany’s ability to create liens on, or engage in sales of, the capital stock of AIHL or RSUI. The 2020 Senior Notes were issued at approximately 99.6 percent of par, resulting in proceeds after underwriting discount, commissions and other expenses of $298.9 million and an effective yield of approximately 5.67 percent.

On January 15, 2020, Alleghany redeemed all of its outstanding 2020 Senior Notes for $312.7 million, consisting of the $300.0 million aggregate principal amount redeemed, $7.1 million of redemption premium and $5.6 million of accrued and unpaid interest on the principal amount being redeemed to the date of redemption. As a result of this early redemption of the 2020 Senior Notes, Alleghany recorded a realized loss, before tax, of $7.1 million in the first quarter of 2020.

See Note 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2019 Form 10-K for additional information on other Alleghany senior notes outstanding.

(b) Alleghany Capital Operating Subsidiaries

The debt associated with Alleghany Capital’s operating subsidiaries totaled $429.8 million and $367.1 million as of March 31, 2020 and December 31, 2019, respectively, and is generally used to support working capital needs and to help finance acquisitions. As of March 31, 2020, the $429.8 million included:

•       $161.6  million of borrowings by Jazwares under its available credit facilities and borrowings incurred and assumed from its acquisition of Wicked Cool Toys, LLC in October 2019;

• $105.8 million of borrowings by W&W|AFCO Steel under its available credit facility and term loan, including borrowings incurred and assumed from its acquisition of Hirschfeld Holdings, LP in February 2018;

• $74.2 million of term loans at Kentucky Trailer primarily related to borrowings to finance small acquisitions, including its acquisitions of a controlling interest in two manufacturers of aluminum feed transportation equipment in December 2018 and July 2019, and borrowings under its available credit facilities;

• $51.2 million of borrowings by IPS under its available credit facility and term loans, in part to finance a small acquisition in May 2019; and$

• $37.0 million of term loans at PCT primarily related to borrowings to finance the acquisition of a waterjet orifice and nozzle manufacturer in 2016 and the acquisition of a consumable cutting tool manufacturer in June 2019.

None of these liabilities are guaranteed by Alleghany or Alleghany Capital. In December 2019, third-party, floating-rate term loans at Concord were repaid and replaced with approximately $33 million of intercompany floating-rate debt funded by the Alleghany parent company. The intercompany debt and related interest expenses are eliminated at the Alleghany consolidated level.

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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3	$ 14.7	$ 1.0
Gross transfers into Level 3		14.7
Foreign corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3	3.3
Gross transfers into Level 3		14.7
U.S. corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3		$ 1.0
Other Asset Backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gross transfers out of Level 3	$ 11.4

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Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands		Mar. 31, 2020		Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Short-term investments due in one year or less, amortized cost		$ 536,100
Mortgage and asset-backed securities, amortized cost	[1]	5,001,900
Debt securities with maturity dates, amortized cost:
One year or less		432,800
Over one through five years		3,174,000
Over five through ten years		2,728,000
Over ten years		1,984,100
Debt securities, amortized cost		13,320,808		$ 13,798,576
Short-term investments due in one year or less, fair value		536,105		914,776
Mortgage and asset-backed securities, fair value	[1]	4,837,600
Debt securities with maturity dates, fair value:
One year or less		432,300
Over one through five years		3,201,300
Over five through ten years		2,770,800
Over ten years		2,095,800
Total debt securities, fair value		$ 13,337,754	[2]	$ 14,211,745

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

[2] Includes allowance for credit losses as of March 31, 2020.  See Note 3(f) of this Form 10-Q for further information on Alleghany’s allowance for credit losses for AFS securities.