10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

___________________________________________

 FORM 10-Q

______________________________________________________________________________________

☒    Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended September 30, 2023

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: 001-15811

_________________________________________

MARKEL GROUP INC.

(Exact name of registrant as specified in its charter)

___________________________________________________________________________________

Virginia	54-1959284
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

4521 Highwoods Parkway, Glen Allen, Virginia 23060-6148

(Address of principal executive offices) (Zip Code)

(804) 747-0136

(Registrant's telephone number, including area code)

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

Title of each class	Trading Symbol(s)	Name of exchange on which registered
Common Stock, no par value	MKL	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  x   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  x No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	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 Exchange Act).   Yes  ☐    No  x

Number of shares of the registrant's common stock outstanding at October 25, 2023: 13,218,534

Markel Group Inc.

Form 10-Q

Index

		Page Number
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets—September 30, 2023 and December 31, 2022	3
	Consolidated Statements of Income (Loss) and Comprehensive Income (Loss)—Quarters and Nine Months Ended September 30, 2023 and 2022	4
	Consolidated Statements of Changes in Equity—Quarters and Nine Months Ended September 30, 2023 and 2022	5
	Condensed Consolidated Statements of Cash Flows—Nine Months Ended September 30, 2023 and 2022	7
	Notes to Consolidated Financial Statements	8
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	31
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	53
Item 4.	Controls and Procedures	54
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	54
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	54
Item 5.	Other Information	55
Item 6.	Exhibits	56
Signatures		58

2

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

MARKEL GROUP INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	September 30, 2023		December 31, 2022
(dollars in thousands)	(unaudited)
ASSETS
Investments, at estimated fair value:
Fixed maturity securities, available-for-sale (amortized cost of $14,067,742 in 2023 and $12,805,887 in 2022)	$	12,951,279	$	11,856,835
Equity securities (cost of $3,401,511 in 2023 and $3,100,040 in 2022)	8,574,957		7,671,912
Short-term investments, available-for-sale (estimated fair value approximates cost)	2,252,726		2,669,262
Total Investments	23,778,962		22,198,009
Cash and cash equivalents	4,354,858		4,137,432
Restricted cash and cash equivalents	690,004		1,084,081
Receivables	3,557,500		2,961,056
Reinsurance recoverables	8,534,919		8,446,745
Deferred policy acquisition costs	985,947		925,483
Prepaid reinsurance premiums	2,707,925		2,066,114
Goodwill	2,623,451		2,638,838
Intangible assets	1,633,188		1,747,464
Other assets	3,881,962		3,586,037
Total Assets	$	52,748,716	$	49,791,259
LIABILITIES AND EQUITY
Unpaid losses and loss adjustment expenses	$	22,144,366	$	20,947,898
Life and annuity benefits	600,256		650,721
Unearned premiums	7,196,808		6,220,748
Payables to insurance and reinsurance companies	924,602		669,742
Senior long-term debt and other debt (estimated fair value of $3,060,000 in 2023 and $3,541,000 in 2022)	3,769,248		4,103,629
Other liabilities	3,590,807		3,461,482
Total Liabilities	38,226,087		36,054,220
Redeemable noncontrolling interests	467,386		523,154
Commitments and contingencies
Shareholders' equity:
Preferred stock	591,891		591,891
Common stock	3,519,534		3,493,893
Retained earnings	10,778,567		9,832,804
Accumulated other comprehensive loss	(890,833)		(767,494)
Total Shareholders' Equity	13,999,159		13,151,094
Noncontrolling interests	56,084		62,791
Total Equity	14,055,243		13,213,885
Total Liabilities and Equity	$	52,748,716	$	49,791,259

See accompanying notes to consolidated financial statements.

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MARKEL GROUP INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (LOSS) AND COMPREHENSIVE INCOME (LOSS)

(Unaudited)

	Quarter Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
(dollars in thousands, except per share data)
OPERATING REVENUES
Earned premiums	$	2,121,745	$	1,956,830	$	6,120,592	$	5,549,704
Net investment income	192,207		112,614		521,235		301,713
Net investment gains (losses)	(265,917)		(281,483)		591,173		(2,194,525)
Products revenues	601,524		586,531		1,964,332		1,845,111
Services and other revenues	725,627		691,653		1,963,779		1,962,585
Total Operating Revenues	3,375,186		3,066,145		11,161,111		7,464,588
OPERATING EXPENSES
Losses and loss adjustment expenses	1,404,325		1,185,313		3,765,215		3,216,495
Underwriting, acquisition and insurance expenses	698,129		643,272		2,071,721		1,843,106
Products expenses	545,567		580,830		1,712,792		1,726,367
Services and other expenses	606,810		546,384		1,678,246		1,693,756
Amortization of intangible assets	47,545		43,418		136,367		134,990
Total Operating Expenses	3,302,376		2,999,217		9,364,341		8,614,714
Operating Income (Loss)	72,810		66,928		1,796,770		(1,150,126)
Interest expense	(44,553)		(47,348)		(141,212)		(147,090)
Net foreign exchange gains (losses)	39,246		113,635		(8,658)		241,706
Income (Loss) Before Income Taxes	67,503		133,215		1,646,900		(1,055,510)
Income tax (expense) benefit	(14,235)		(16,460)		(339,903)		240,629
Net Income (Loss)	53,268		116,755		1,306,997		(814,881)
Net income attributable to noncontrolling interests	(10,677)		(57,161)		(80,243)		(93,062)
Net Income (Loss) to Shareholders	42,591		59,594		1,226,754		(907,943)
Preferred stock dividends	—		—		(18,000)		(18,000)
Net Income (Loss) to Common Shareholders	$	42,591	$	59,594	$	1,208,754	$	(925,943)
OTHER COMPREHENSIVE LOSS
Change in net unrealized gains (losses) on available-for-sale investments, net of taxes:
Net holding losses arising during the period	$	(187,330)	$	(424,929)	$	(161,115)	$	(1,308,521)
Reclassification adjustments for net losses included in net income (loss)	22,869		591		26,268		2,289
Change in net unrealized gains (losses) on available-for-sale investments, net of taxes	(164,461)		(424,338)		(134,847)		(1,306,232)
Change in discount rate for life and annuity benefits, net of taxes	14,609		25,244		8,781		149,135
Change in foreign currency translation adjustments, net of taxes	(187)		(8,872)		2,753		(14,395)
Change in net actuarial pension loss, net of taxes	20		303		56		1,808
Total Other Comprehensive Loss	(150,019)		(407,663)		(123,257)		(1,169,684)
Comprehensive Income (Loss)	(96,751)		(290,908)		1,183,740		(1,984,565)
Comprehensive income attributable to noncontrolling interests	(10,749)		(57,051)		(80,326)		(92,996)
Comprehensive Income (Loss) to Shareholders	$	(107,500)	$	(347,959)	$	1,103,414	$	(2,077,561)
NET INCOME (LOSS) PER COMMON SHARE
Basic	$	3.15	$	3.09	$	90.86	$	(72.61)
Diluted	$	3.14	$	3.08	$	90.69	$	(72.61)

See accompanying notes to consolidated financial statements.

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MARKEL GROUP INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(Unaudited)

Quarter Ended September 30, 2023	Preferred  Stock		Common Stock		Retained Earnings		Accumulated Other Comprehensive Loss		Total Shareholders' Equity		Noncontrolling Interests		Total Equity		Redeemable Noncontrolling Interests
(dollars in thousands)
June 30, 2023	$	591,891	$	3,515,362	$	10,818,989	$	(740,743)	$	14,185,499	$	53,582	$	14,239,081	$	464,442
Net income					42,591		—		42,591		2,502		45,093		8,175
Other comprehensive income (loss)					—		(150,091)		(150,091)		—		(150,091)		72
Comprehensive Income (Loss)									(107,500)		2,502		(104,998)		8,247
Repurchase of common stock	—		—		(82,432)		—		(82,432)		—		(82,432)		—
Restricted stock awards expensed	—		4,949		—		—		4,949		—		4,949		—
Adjustment of redeemable noncontrolling interests	—		—		(628)		—		(628)		—		(628)		628
Purchase of noncontrolling interests	—		(776)		—		—		(776)		—		(776)		570
Other	—		(1)		47		1		47		—		47		(6,501)
September 30, 2023	$	591,891	$	3,519,534	$	10,778,567	$	(890,833)	$	13,999,159	$	56,084	$	14,055,243	$	467,386

Nine Months Ended September 30, 2023	Preferred  Stock		Common Stock		Retained Earnings		Accumulated Other Comprehensive Loss		Total Shareholders' Equity		Noncontrolling Interests		Total Equity		Redeemable Noncontrolling Interests
(dollars in thousands)
December 31, 2022	$	591,891	$	3,493,893	$	9,832,804	$	(767,494)	$	13,151,094	$	62,791	$	13,213,885	$	523,154
Net income					1,226,754		—		1,226,754		55,940		1,282,694		24,303
Other comprehensive income (loss)					—		(123,340)		(123,340)		—		(123,340)		83
Comprehensive Income									1,103,414		55,940		1,159,354		24,386
Repurchase of common stock	—		—		(269,593)		—		(269,593)		—		(269,593)		—
Preferred stock dividends	—		—		(18,000)		—		(18,000)		—		(18,000)		—
Restricted stock awards expensed	—		31,477		—		—		31,477		—		31,477		—
Adjustment of redeemable noncontrolling interests	—		—		7,087		—		7,087		—		7,087		(7,087)
Purchase of noncontrolling interests	—		(5,464)		—		—		(5,464)		—		(5,464)		(48,907)
Redemption of Markel CATCo Re noncontrolling interests	—		—		—		—		—		(62,646)		(62,646)		—
Other	—		(372)		(485)		1		(856)		(1)		(857)		(24,160)
September 30, 2023	$	591,891	$	3,519,534	$	10,778,567	$	(890,833)	$	13,999,159	$	56,084	$	14,055,243	$	467,386

See accompanying notes to consolidated financial statements.

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MARKEL GROUP INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(Unaudited)

Quarter Ended September 30, 2022	Preferred Stock		Common Stock		Retained Earnings		Accumulated Other Comprehensive Loss		Total Shareholders' Equity		Noncontrolling Interests		Total Equity		Redeemable Noncontrolling Interests
(dollars in thousands)
June 30, 2022	$	591,891	$	3,478,153	$	9,289,616	$	(540,058)	$	12,819,602	$	11,125	$	12,830,727	$	495,378
Net income					59,594		—		59,594		52,867		112,461		4,294
Other comprehensive loss					—		(407,553)		(407,553)		—		(407,553)		(110)
Comprehensive Income (Loss)									(347,959)		52,867		(295,092)		4,184
Repurchase of common stock	—		—		(81,799)		—		(81,799)		—		(81,799)		—
Restricted stock awards expensed	—		4,661		—		—		4,661		—		4,661		—
Adjustment of redeemable noncontrolling interests	—		—		(17,730)		—		(17,730)		—		(17,730)		17,730
Other	—		14		(2)		—		12		804		816		(4,249)
September 30, 2022	$	591,891	$	3,482,828	$	9,249,679	$	(947,611)	$	12,376,787	$	64,796	$	12,441,583	$	513,043

Nine Months Ended September 30, 2022	Preferred  Stock		Common Stock		Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Total Shareholders' Equity		Noncontrolling Interests		Total Equity		Redeemable Noncontrolling Interests
(dollars in thousands)
December 31, 2021	$	591,891	$	3,441,079	$	10,444,895	$	222,007	$	14,699,872	$	22,860	$	14,722,732	$	461,378
Net income (loss)					(907,943)		—		(907,943)		78,283		(829,660)		14,779
Other comprehensive loss					—		(1,169,618)		(1,169,618)		—		(1,169,618)		(66)
Comprehensive Income (Loss)									(2,077,561)		78,283		(1,999,278)		14,713
Repurchase of common stock	—		—		(208,090)		—		(208,090)		—		(208,090)		—
Preferred stock dividends	—		—		(18,000)		—		(18,000)		—		(18,000)		—
Restricted stock awards expensed	—		37,531		—		—		37,531		—		37,531		—
Adjustment of redeemable noncontrolling interests	—		—		(62,168)		—		(62,168)		—		(62,168)		62,168
Adjustment to Metromont purchase price allocation	—		—		—		—		—		—		—		(18,681)
Disposition of Velocity	—		—		—		—		—		(22,059)		(22,059)		—
Redemption of Markel CATCo Re noncontrolling interests	—		—		—		—		—		(22,261)		(22,261)		—
Other	—		4,218		985		—		5,203		7,973		13,176		(6,535)
September 30, 2022	$	591,891	$	3,482,828	$	9,249,679	$	(947,611)	$	12,376,787	$	64,796	$	12,441,583	$	513,043

See accompanying notes to consolidated financial statements.

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MARKEL GROUP INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Nine Months Ended September 30,
	2023		2022
	(dollars in thousands)
OPERATING ACTIVITIES
Net income (loss)	$	1,306,997	$	(814,881)
Adjustments to reconcile net income (loss) to net cash provided by operating activities	657,280		2,695,153
Net Cash Provided By Operating Activities	1,964,277		1,880,272
INVESTING ACTIVITIES
Proceeds from sales, maturities, calls and prepayments of fixed maturity securities	1,359,948		557,742
Cost of fixed maturity securities purchased	(2,661,587)		(1,433,299)
Proceeds from sales of equity securities	179,665		164,277
Cost of equity securities purchased	(448,388)		(293,011)
Net change in short-term investments	487,839		(625,261)
Cost of equity method and other investments purchased	(159,591)		(18,782)
Additions to property and equipment	(155,088)		(209,282)
Consolidation of Markel CATCo Re, net	—		629,955
Distributions to Markel CATCo Re noncontrolling interests for buy-out transaction	—		(169,380)
Proceeds from sales of subsidiaries, net	41,302		109,505
Other	13,267		4,211
Net Cash Used By Investing Activities	(1,342,633)		(1,283,325)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	475,964		757,941
Repayment of senior long-term debt and other debt	(811,857)		(982,852)
Repurchases of common stock	(269,593)		(208,090)
Dividends paid on preferred stock	(18,000)		(18,000)
Redemption of Markel CATCo Re noncontrolling interests	(88,997)		—
Purchase of noncontrolling interests	(54,371)		(30)
Other	(32,434)		(40,023)
Net Cash Used By Financing Activities	(799,288)		(491,054)
Effect of foreign currency rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents	993		(190,972)
Increase in cash, cash equivalents, restricted cash and restricted cash equivalents	(176,651)		(85,079)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	5,221,513		4,880,947
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD	$	5,044,862	$	4,795,868

See accompanying notes to consolidated financial statements.

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MARKEL GROUP INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Summary of Significant Accounting Policies

Markel Group Inc., formerly Markel Corporation, is a holding company comprised of a diverse group of companies and investments with specialty insurance at its core. Effective May 26, 2023, Markel Corporation changed its name to Markel Group Inc. (Markel Group). Through its wholly owned subsidiary, Markel Ventures, Inc. (Markel Ventures), Markel Group owns controlling interests in businesses that operate in a variety of industries. See note 2 for details regarding reportable segments.

a) Basis of Presentation. The consolidated balance sheet as of September 30, 2023 and the related consolidated statements of income (loss) and comprehensive income (loss) and changes in equity for the quarters and nine months ended September 30, 2023 and 2022, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2023 and 2022 are unaudited. In the opinion of management, all adjustments necessary for fair presentation of such consolidated financial statements have been included. Except for the adjustments described in note 1 c), such adjustments consist only of normal, recurring items. Interim results are not necessarily indicative of results of operations for the entire year. The consolidated balance sheet as of December 31, 2022 was derived from Markel Group's audited annual consolidated financial statements.

The accompanying consolidated financial statements have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) and include the accounts of Markel Group and its consolidated subsidiaries, as well as variable interest entities (VIEs) that meet the requirements for consolidation (the Company). All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates the results of its Markel Ventures subsidiaries on a one-month lag, with the exception of significant transactions or events that occur during the intervening period. Certain prior period amounts have been reclassified to conform to the current period presentation.

The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

The consolidated financial statements and notes are presented as permitted by Form 10-Q and do not contain certain information included in the Company's annual consolidated financial statements and notes. The following accounting policy was updated to reflect an accounting standard that became effective January 1, 2023. See note 1 c). For a more complete description of the Company's business and accounting policies, readers are urged to review the Company's 2022 Annual Report on Form 10-K.

b) Life and Annuity Benefits. The Company has a run-off block of life and annuity reinsurance contracts that subject the Company to mortality, longevity and morbidity risks. Effective January 1, 2023, the Company adopted Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2018-12, Financial Services—Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts and restated all prior periods presented to reflect the new accounting standard. The primary component of the Company's liabilities for life and annuity benefits is the present value of the liability for future policyholder benefits. The cash flow assumptions used to determine the policyholder benefit reserves are reviewed, and updated as necessary, at least annually. Interest accretion for the reserves is calculated using the discount rate locked-in at contract inception. Policy benefit reserves are remeasured each period using current discount rates, based on yields for upper-medium grade fixed maturity securities, with the impact of changes in the discount rate included in other comprehensive income, net of taxes. All other results attributable to the run-off of life and annuity reinsurance contracts are included in services and other revenues and services and other expenses in the consolidated statements of income and comprehensive income. Investment income earned on the investments that support the policy benefit reserves are included in net investment income. Because of the uncertainty in the assumptions used to estimate reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimated liability. See note 9 for further details regarding life and annuity benefits.

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c) Recent Accounting Pronouncements

Accounting Standards Adopted

Effective January 1, 2023, the Company adopted ASU No. 2018-12 and several ASUs issued as amendments to ASU No. 2018-12. This standard requires insurance companies with long duration contracts to: (1) review and, if there is a change, update the assumptions used to measure expected cash flows at least annually; (2) update the discount rate assumption at each reporting date; and (3) enhance certain qualitative and quantitative disclosures. ASU No. 2018-12 was applied using a modified retrospective approach that required restatement of prior periods presented, including a cumulative adjustment recorded to accumulated other comprehensive income as of January 1, 2021 (the transition date) as a result of updating the discount rate assumption. At the transition date, the adoption of ASU 2018-12 had no impact on retained earnings but resulted in a decrease to accumulated other comprehensive income, net of taxes, of $15.3 million, which was comprised of the following corresponding adjustments to life and annuity benefits and deferred tax liabilities.

(dollars in thousands)	January 1, 2021
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities	$	119,548
Apply updated discount rate to the liability for future policyholder benefits	(138,865)
Increase in life and annuity benefits	(19,317)
Decrease in deferred tax liability	4,057
Decrease in accumulated other comprehensive income, net of taxes	$	(15,260)

The impact of changes in the discount rate on the liability for future policyholder benefits following the transition date are included in other comprehensive income (loss) in the respective periods and, combined with the transition adjustment, resulted in the following cumulative changes to the Company's previously presented consolidated balance sheets.

	December 31,
(dollars in thousands)	2022		2021
Decrease (increase) in life and annuity benefits	$	113,396	$	(19,759)
Decrease (increase) in deferred tax liability	(23,813)		4,149
Increase (decrease) in accumulated other comprehensive income (loss), net of taxes	$	89,583	$	(15,610)

Changes in the discount rate on the liability for future policyholder benefits also resulted in an increase, or benefit, of $25.2 million and $104.5 million to the other comprehensive loss previously presented for the quarter and nine months ended September 30, 2022, which was comprised of the following adjustments.

(dollars in thousands)	Quarter Ended September 30, 2022		Nine Months Ended September 30, 2022
Reverse benefit included in change in net unrealized gains (losses) on available-for-sale-investments, net of taxes, related to reversal of previously recognized reserve deficiency adjustment	$	—	$	(44,682)
Change in discount rate for life and annuity benefits, net of taxes	25,244		149,135
Increase in other comprehensive loss, net of taxes	$	25,244	$	104,453

The adoption of other provisions of this ASU did not have a material impact on the Company's financial position, results of operations or cash flows for any of the periods presented.

Effective January 1, 2023, the Company adopted ASU No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. ASU No. 2021-08 requires contract assets and liabilities accounted for under FASB Accounting Standards Codification (ASC) 606, Revenue from Contracts with Customers, to be recorded at the acquisition date as if the acquirer entered into those contracts itself on the contract inception dates, rather than at fair value. At adoption, ASU No. 2021-08 did not impact the Company's financial position, results of operations or cash flows, but prospectively, this ASU will impact amounts recorded by the Company for assets acquired and liabilities assumed in conjunction with certain acquisitions.

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2. Segment Reporting Disclosures

The chief operating decision maker reviews the Company's ongoing underwriting operations on a global basis in the following two segments: Insurance and Reinsurance. In determining how to allocate resources and assess the performance of the Company's underwriting results, management considers many factors, including the nature of the insurance product sold, the type of account written and the type of customer served. The Insurance segment includes all direct business and facultative placements written on a risk-bearing basis within the Company's underwriting operations. The Reinsurance segment includes all treaty reinsurance written on a risk-bearing basis within the Company's underwriting operations. All investing activities related to the Company's insurance operations are included in the Investing segment.

The Company's other insurance operations primarily consist of the results of the Company's insurance-linked securities operations and program services business. Other insurance operations also include results for lines of business discontinued prior to, or in conjunction with, acquisitions, including development on asbestos and environmental loss reserves and results attributable to the run-off of life and annuity reinsurance business, which are monitored separately from the Company's ongoing underwriting operations. For purposes of segment reporting, none of these other insurance operations are considered to be reportable segments.

The Company's chief operating decision maker reviews and assesses Markel Ventures' performance in the aggregate, as a single operating segment. The Markel Ventures segment primarily consists of controlling interests in a diverse portfolio of businesses that operate in various industries.

Segment profit for each of the Company's underwriting segments is measured by underwriting profit. The property and casualty insurance industry commonly defines underwriting profit as earned premiums net of losses and loss adjustment expenses and underwriting, acquisition and insurance expenses. Underwriting profit does not replace operating income or net income computed in accordance with U.S. GAAP as a measure of profitability. Underwriting profit or loss provides a basis for management to evaluate the Company's underwriting performance. Segment profit for the Company's underwriting segments may also include other revenues and expenses that are attributable to the Company's underwriting operations that are not captured in underwriting profit. Segment profit for the Investing segment is measured by income from the Company's investment portfolio, which is comprised of net investment income and net investment gains. Segment profit for the Investing segment also includes income from equity method investments, which is included within services and other revenues. Segment profit for the Markel Ventures segment is measured by operating income.

For management reporting purposes, the Company allocates assets to its underwriting operations and to its Investing and Markel Ventures segments and certain of its other operations, including its insurance-linked securities and program services operations. Underwriting assets include assets attributed to the Company's Insurance and Reinsurance segments, discontinued underwriting lines of business, as well as assets that are not specifically allocated to the Company's other operations. Generally, the Company manages its underwriting assets in the aggregate and therefore does not allocate assets to individual underwriting segments.

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a) The following tables summarize the Company's segment disclosures.

	Quarter Ended September 30, 2023
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	1,848,267	$	274,161	$	—	$	—	$	(683)	$	2,121,745
Net investment income	—		—		191,015		1,192		—		192,207
Net investment losses	—		—		(265,917)		—		—		(265,917)
Products revenues	—		—		—		601,524		—		601,524
Services and other revenues	—		—		(5,033)		644,053		86,607		725,627
Total operating revenues	1,848,267		274,161		(79,935)		1,246,769		85,924		3,375,186
Losses and loss adjustment expenses:
Current accident year	(1,258,864)		(176,007)		—		—		—		(1,434,871)
Prior accident years	55,374		(23,262)		—		—		(1,566)		30,546
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(369,001)		(68,919)		—		—		—		(437,920)
Other underwriting expenses	(250,684)		(11,785)		—		—		2,260		(260,209)
Products expenses	—		—		—		(545,567)		—		(545,567)
Services and other expenses	—		—		—		(570,782)		(36,028)		(606,810)
Amortization of intangible assets (2)	—		—		—		(23,118)		(24,427)		(47,545)
Segment profit (loss)	$	25,092	$	(5,812)	$	(79,935)	$	107,302	$	26,163	$	72,810
Interest expense											(44,553)
Net foreign exchange gains											39,246
Income before income taxes											$	67,503

(1)    Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)    Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.1 million for the quarter ended September 30, 2023.

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	Quarter Ended September 30, 2022
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	1,695,029	$	260,535	$	—	$	—	$	1,266	$	1,956,830
Net investment income	—		—		112,297		317		—		112,614
Net investment losses	—		—		(281,483)		—		—		(281,483)
Products revenues	—		—		—		586,531		—		586,531
Services and other revenues	—		—		(4,883)		629,215		67,321		691,653
Total operating revenues	1,695,029		260,535		(174,069)		1,216,063		68,587		3,066,145
Losses and loss adjustment expenses:
Current accident year	(1,100,511)		(166,485)		—		—		—		(1,266,996)
Prior accident years	53,760		29,505		—		—		(1,582)		81,683
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(362,137)		(68,662)		—		—		(383)		(431,182)
Other underwriting expenses	(200,604)		(11,638)		—		—		152		(212,090)
Products expenses	—		—		—		(580,830)		—		(580,830)
Services and other expenses	—		—		—		(556,207)		9,823		(546,384)
Amortization of intangible assets (2)	—		—		—		(18,567)		(24,851)		(43,418)
Segment profit (loss)	$	85,537	$	43,255	$	(174,069)	$	60,459	$	51,746	$	66,928
Interest expense											(47,348)
Net foreign exchange gains											113,635
Income before income taxes											$	133,215

(1)     Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)     Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.6 million for the quarter ended September 30, 2022.

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	Nine Months Ended September 30, 2023
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	5,322,377	$	799,683	$	—	$	—	$	(1,468)	$	6,120,592
Net investment income	—		—		518,536		2,699		—		521,235
Net investment gains	—		—		591,173		—		—		591,173
Products revenues	—		—		—		1,964,332		—		1,964,332
Services and other revenues	—		—		(13,791)		1,770,997		206,573		1,963,779
Total operating revenues	5,322,377		799,683		1,095,918		3,738,028		205,105		11,161,111
Losses and loss adjustment expenses:
Current accident year	(3,415,860)		(519,109)		—		—		—		(3,934,969)
Prior accident years	179,564		(6,584)		—		—		(3,226)		169,754
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(1,096,500)		(202,271)		—		—		—		(1,298,771)
Other underwriting expenses	(733,334)		(38,113)		—		—		(1,503)		(772,950)
Products expenses	—		—		—		(1,712,792)		—		(1,712,792)
Services and other expenses	—		—		—		(1,632,588)		(45,658)		(1,678,246)
Amortization of intangible assets (2)	—		—		—		(62,528)		(73,839)		(136,367)
Segment profit	$	256,247	$	33,606	$	1,095,918	$	330,120	$	80,879	$	1,796,770
Interest expense											(141,212)
Net foreign exchange losses											(8,658)
Income before income taxes											$	1,646,900

(1)    Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)    Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $28.0 million for the nine months ended September 30, 2023.

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	Nine Months Ended September 30, 2022
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	4,742,178	$	808,656	$	—	$	—	$	(1,130)	$	5,549,704
Net investment income	—		—		301,289		424		—		301,713
Net investment losses	—		—		(2,194,525)		—		—		(2,194,525)
Products revenues	—		—		—		1,845,111		—		1,845,111
Services and other revenues	—		—		(27,590)		1,682,318		307,857		1,962,585
Total operating revenues	4,742,178		808,656		(1,920,826)		3,527,853		306,727		7,464,588
Losses and loss adjustment expenses:
Current accident year	(2,906,031)		(514,875)		—		—		—		(3,420,906)
Prior accident years	196,093		13,845		—		—		(5,527)		204,411
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(996,369)		(209,541)		—		—		(415)		(1,206,325)
Other underwriting expenses	(596,426)		(37,708)		—		—		(2,647)		(636,781)
Products expenses	—		—		—		(1,726,367)		—		(1,726,367)
Services and other expenses	—		—		—		(1,524,167)		(169,589)		(1,693,756)
Amortization of intangible assets (2)	—		—		—		(60,077)		(74,913)		(134,990)
Segment profit (loss)	$	439,445	$	60,377	$	(1,920,826)	$	217,242	$	53,636	$	(1,150,126)
Interest expense											(147,090)
Net foreign exchange gains											241,706
Loss before income taxes											$	(1,055,510)

(1)     Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)     Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $29.0 million for the nine months ended September 30, 2022.

b) The following amounts attributable to the Markel Ventures segment are also reviewed, or included in measures reviewed, by the Company's chief operating decision maker.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Depreciation expense	$	26,857	$	23,738	$	81,639	$	75,304
Interest expense (1)	$	10,663	$	11,921	$	36,485	$	34,124
Income tax expense	$	22,253	$	12,603	$	66,022	$	43,682
Capital expenditures	$	65,616	$	48,294	$	135,159	$	144,974

(1)    Interest expense for the quarter and nine months ended September 30, 2023 included intercompany interest expense of $6.6 million and $19.9 million, respectively. Interest expense for the quarter and nine months ended September 30, 2022 included intercompany interest expense of $6.6 million and $20.7 million, respectively. Intercompany interest expense was eliminated in consolidation.

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c) The following table reconciles segment assets to the Company's consolidated balance sheets.

(dollars in thousands)	September 30, 2023		December 31, 2022
Segment assets:
Investing	$	28,522,052	$	26,982,280
Underwriting	9,884,553		8,853,559
Markel Ventures	5,444,105		5,315,677
Total segment assets	43,850,710		41,151,516
Other operations	8,898,006		8,639,743
Total assets	$	52,748,716	$	49,791,259

3. Investments

a) The following tables summarize the Company's available-for-sale investments. Commercial and residential mortgage-backed securities include securities issued by U.S. government-sponsored enterprises and U.S. government agencies. The net unrealized holding gains (losses) in the tables below are presented before taxes.

	September 30, 2023
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Fixed maturity securities:
U.S. Treasury securities	$	3,440,991	$	—	$	(130,162)	$	3,310,829
U.S. government-sponsored enterprises	1,133,417		—		(137,733)		995,684
Obligations of states, municipalities and political subdivisions	4,106,251		879		(308,184)		3,798,946
Foreign governments	1,749,621		2,626		(189,128)		1,563,119
Commercial mortgage-backed securities	2,297,828		11		(208,466)		2,089,373
Residential mortgage-backed securities	511,525		1		(32,686)		478,840
Asset-backed securities	1,226		—		(28)		1,198
Corporate bonds	826,883		758		(114,351)		713,290
Total fixed maturity securities	14,067,742		4,275		(1,120,738)		12,951,279
Short-term investments	2,250,219		3,253		(746)		2,252,726
Investments, available-for-sale	$	16,317,961	$	7,528	$	(1,121,484)	$	15,204,005

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	December 31, 2022
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Fixed maturity securities:
U.S. Treasury securities	$	3,050,089	$	2,363	$	(138,493)	$	2,913,959
U.S. government-sponsored enterprises	871,463		154		(106,079)		765,538
Obligations of states, municipalities and political subdivisions	3,973,911		6,503		(247,231)		3,733,183
Foreign governments	1,473,658		2,843		(169,723)		1,306,778
Commercial mortgage-backed securities	2,109,721		395		(169,668)		1,940,448
Residential mortgage-backed securities	553,591		6		(26,804)		526,793
Asset-backed securities	1,693		—		(53)		1,640
Corporate bonds	771,761		836		(104,101)		668,496
Total fixed maturity securities	12,805,887		13,100		(962,152)		11,856,835
Short-term investments	2,663,560		5,760		(58)		2,669,262
Investments, available-for-sale	$	15,469,447	$	18,860	$	(962,210)	$	14,526,097

b) The following tables summarize gross unrealized investment losses on available-for-sale investments by the length of time that securities have continuously been in an unrealized loss position.

	September 30, 2023
	Less than 12 months				12 months or longer				Total
(dollars in thousands)	Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses
Fixed maturity securities:
U.S. Treasury securities	$	1,339,577	$	(33,496)	$	1,971,252	$	(96,666)	$	3,310,829	$	(130,162)
U.S. government-sponsored enterprises	302,362		(13,784)		693,322		(123,949)		995,684		(137,733)
Obligations of states, municipalities and political subdivisions	1,469,105		(36,622)		2,240,788		(271,562)		3,709,893		(308,184)
Foreign governments	442,453		(18,214)		1,095,516		(170,914)		1,537,969		(189,128)
Commercial mortgage-backed securities	321,255		(13,554)		1,764,367		(194,912)		2,085,622		(208,466)
Residential mortgage-backed securities	45,081		(1,074)		433,695		(31,612)		478,776		(32,686)
Asset-backed securities	—		—		1,198		(28)		1,198		(28)
Corporate bonds	98,459		(2,890)		605,598		(111,461)		704,057		(114,351)
Total fixed maturity securities	4,018,292		(119,634)		8,805,736		(1,001,104)		12,824,028		(1,120,738)
Short-term investments	203,710		(746)		—		—		203,710		(746)
Total	$	4,222,002	$	(120,380)	$	8,805,736	$	(1,001,104)	$	13,027,738	$	(1,121,484)

At September 30, 2023, the Company held 1,732 available-for-sale securities in an unrealized loss position with a total estimated fair value of $13.0 billion and gross unrealized losses of $1.1 billion. Of these 1,732 securities, 1,150 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $8.8 billion and gross unrealized losses of $1.0 billion.

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	December 31, 2022
	Less than 12 months				12 months or longer				Total
(dollars in thousands)	Estimated Fair Value		Gross Unrealized Holding  Losses		Estimated Fair Value		Gross Unrealized Holding  Losses		Estimated Fair Value		Gross Unrealized Holding  Losses
Fixed maturity securities:
U.S. Treasury securities	$	735,605	$	(30,583)	$	1,907,922	$	(107,910)	$	2,643,527	$	(138,493)
U.S. government-sponsored enterprises	413,495		(40,488)		331,391		(65,591)		744,886		(106,079)
Obligations of states, municipalities and political subdivisions	2,474,289		(164,537)		348,943		(82,694)		2,823,232		(247,231)
Foreign governments	900,322		(115,324)		300,423		(54,399)		1,200,745		(169,723)
Commercial mortgage-backed securities	1,611,603		(117,482)		305,217		(52,186)		1,916,820		(169,668)
Residential mortgage-backed securities	516,423		(25,232)		9,342		(1,572)		525,765		(26,804)
Asset-backed securities	1,640		(53)		—		—		1,640		(53)
Corporate bonds	496,766		(74,542)		153,035		(29,559)		649,801		(104,101)
Total fixed maturity securities	7,150,143		(568,241)		3,356,273		(393,911)		10,506,416		(962,152)
Short-term investments	774,480		(58)		—		—		774,480		(58)
Total	$	7,924,623	$	(568,299)	$	3,356,273	$	(393,911)	$	11,280,896	$	(962,210)

At December 31, 2022, the Company held 1,400 available-for-sale securities in an unrealized loss position with a total estimated fair value of $11.3 billion and gross unrealized losses of $962.2 million. Of these 1,400 securities, 246 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $3.4 billion and gross unrealized losses of $393.9 million.

The Company completes a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is the result of a credit loss. All available-for-sale securities with unrealized losses are reviewed. The Company considers many factors in completing its quarterly review of securities with unrealized losses for credit-related impairment to determine whether a credit loss exists, including the extent to which fair value is below cost, the implied yield to maturity, rating downgrades of the security and whether or not the issuer has failed to make scheduled principal or interest payments. The Company also takes into consideration information about the financial condition of the issuer and industry factors that could negatively impact the issuer.

If the decline in fair value of an available-for-sale security below its amortized cost is considered to be the result of a credit loss, the Company compares the estimated present value of the cash flows expected to be collected to the amortized cost of the security. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the credit loss, which is recorded as an allowance and recognized in net income. The allowance is limited to the difference between the fair value and the amortized cost of the security. Any remaining decline in fair value represents the non-credit portion of the impairment, which is recognized in other comprehensive income. The Company did not have an allowance for credit losses as of September 30, 2023 or December 31, 2022.

Quarterly, the Company also considers whether it intends to sell an available-for-sale security or if it is more likely than not that it will be required to sell a security before recovery of its amortized cost. In these instances, a decline in fair value is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security.

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c) The amortized cost and estimated fair value of fixed maturity securities at September 30, 2023 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,245,195	$	1,221,058
Due after one year through five years	4,731,573		4,490,492
Due after five years through ten years	3,655,839		3,269,429
Due after ten years	1,624,556		1,400,889
	11,257,163		10,381,868
Commercial mortgage-backed securities	2,297,828		2,089,373
Residential mortgage-backed securities	511,525		478,840
Asset-backed securities	1,226		1,198
Total fixed maturity securities	$	14,067,742	$	12,951,279

d) The following table presents the components of net investment income.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Interest:
Fixed maturity securities	$	98,891	$	72,477	$	269,438	$	215,541
Short-term investments	26,768		10,316		77,099		14,644
Cash and cash equivalents and restricted cash and cash equivalents	39,473		7,794		102,565		9,619
Dividends on equity securities	31,134		25,962		84,968		74,289
	196,266		116,549		534,070		314,093
Investment expenses	(4,059)		(3,935)		(12,835)		(12,380)
Net investment income	$	192,207	$	112,614	$	521,235	$	301,713

e) The following table presents the components of net investment gains (losses) included in net income (loss) and the change in net unrealized gains (losses) included in other comprehensive loss. Gross realized investment gains and losses on fixed maturity securities, short-term investments and other investments were not material to the consolidated financial statements and are presented on a net basis in the following table.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Fixed maturity securities, short-term investments and other investments:
Net realized investment gains (losses)	$	(36,093)	$	2,032	$	(38,159)	$	6,001
Equity securities:
Change in fair value of securities sold during the period	2,683		2,553		16,706		(29,015)
Change in fair value of securities held at the end of the period	(232,507)		(286,068)		612,626		(2,171,511)
Total change in fair value	(229,824)		(283,515)		629,332		(2,200,526)
Net investment gains (losses)	$	(265,917)	$	(281,483)	$	591,173	$	(2,194,525)
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive loss:
Fixed maturity securities	$	(208,598)	$	(530,161)	$	(167,411)	$	(1,645,060)
Short-term investments	193		(8,186)		(3,195)		(11,563)
Net decrease	$	(208,405)	$	(538,347)	$	(170,606)	$	(1,656,623)

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4. Fair Value Measurements

FASB ASC 820, Fair Value Measurements and Disclosures, establishes a three-level hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the assets or liabilities fall within different levels of the hierarchy, the classification is based on the lowest level input that is significant to the fair value measurement of the asset or liability.

Classification of assets and liabilities within the hierarchy considers the markets in which the assets and liabilities are traded and the reliability and transparency of the assumptions used to determine fair value. The hierarchy requires the use of observable market data when available. The levels of the hierarchy are defined as follows:

•Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities traded in active markets.

•Level 2 – Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and market-corroborated inputs.

•Level 3 – Inputs to the valuation methodology are unobservable for the asset or liability and are significant to the fair value measurement.

In accordance with ASC 820, the Company determines fair value based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining fair value, the Company uses various methods, including the market, income and cost approaches. The Company uses valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The following section describes the valuation methodologies used by the Company to measure assets and liabilities at fair value, including an indication of the level within the fair value hierarchy in which each asset or liability is generally classified.

Available-for-sale investments and equity securities. Available-for-sale investments and equity securities are recorded at fair value on a recurring basis. Available-for-sale investments include fixed maturity securities and short-term investments. Fair value is determined by the Company after considering various sources of information, including information provided by a third-party pricing service. The pricing service provides prices for substantially all of the Company's fixed maturity securities and equity securities. In determining fair value, the Company generally does not adjust the prices obtained from the pricing service. The Company obtains an understanding of the pricing service's valuation methodologies and related inputs, which include, but are not limited to, reported trades, benchmark yields, issuer spreads, bids, offers, duration, credit ratings, estimated cash flows and prepayment speeds. The Company validates prices provided by the pricing service by reviewing prices from other pricing sources and analyzing pricing data in certain instances.

The Company has evaluated the various types of securities in its investment portfolio to determine an appropriate fair value hierarchy level based upon trading activity and the observability of market inputs. Level 1 investments include those traded on an active exchange, such as the New York Stock Exchange. Level 2 investments include U.S. Treasury securities, U.S. government-sponsored enterprises, municipal bonds, foreign government bonds, commercial mortgage-backed securities, residential mortgage-backed securities, asset-backed securities and corporate debt securities. Level 3 investments include the Company's investments in insurance-linked securities funds that are in run-off, which are not traded on an active exchange and are valued using unobservable inputs.

Fair value for available-for-sale investments and equity securities is measured based upon quoted prices in active markets, if available. Due to variations in trading volumes and the lack of quoted market prices, fixed maturity securities are classified as Level 2 investments. The fair value of fixed maturity securities is normally derived through recent reported trades for identical or similar securities, making adjustments through the reporting date based upon available market observable data previously described. If there are no recent reported trades, the fair value of fixed maturity securities may be derived through the use of matrix pricing or model processes, where future cash flow expectations are developed based upon collateral performance and discounted at an estimated market rate. Significant inputs used to determine the fair value of obligations of states, municipalities and political subdivisions, corporate bonds and obligations of foreign governments include reported trades, benchmark yields, issuer spreads, bids, offers, credit information and estimated cash flows. Significant inputs used to determine the fair value of commercial mortgage-backed securities, residential mortgage-backed securities and asset-backed securities include the type of underlying assets, benchmark yields, prepayment speeds, collateral information, tranche type and volatility, estimated cash flows, credit information, default rates, recovery rates, issuer spreads and the year of issue.

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Senior long-term debt and other debt. Senior long-term debt and other debt is carried at amortized cost with the estimated fair value disclosed on the consolidated balance sheets. Senior long-term debt and other debt is classified as Level 2 within the fair value hierarchy due to variations in trading volumes and the lack of quoted market prices. Fair value is generally derived through recent reported trades, making adjustments through the reporting date, if necessary, based upon available market observable data including U.S. Treasury securities and implied credit spreads. Significant inputs used to determine the fair value of senior long-term debt and other debt include reported trades, benchmark yields, issuer spreads, bids and offers.

The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.

	September 30, 2023
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments:
Fixed maturity securities, available-for-sale:
U.S. Treasury securities	$	—	$	3,310,829	$	—	$	3,310,829
U.S. government-sponsored enterprises	—		995,684		—		995,684
Obligations of states, municipalities and political subdivisions	—		3,798,946		—		3,798,946
Foreign governments	—		1,563,119		—		1,563,119
Commercial mortgage-backed securities	—		2,089,373		—		2,089,373
Residential mortgage-backed securities	—		478,840		—		478,840
Asset-backed securities	—		1,198		—		1,198
Corporate bonds	—		713,290		—		713,290
Total fixed maturity securities, available-for-sale	—		12,951,279		—		12,951,279
Equity securities:
Insurance, banks and other financial institutions	3,304,299		—		942		3,305,241
Industrial, consumer and all other	5,269,716		—		—		5,269,716
Total equity securities	8,574,015		—		942		8,574,957
Short-term investments, available-for-sale	2,085,072		167,654		—		2,252,726
Total investments	$	10,659,087	$	13,118,933	$	942	$	23,778,962

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	December 31, 2022
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments:
Fixed maturity securities, available-for-sale:
U.S. Treasury securities	$	—	$	2,913,959	$	—	$	2,913,959
U.S. government-sponsored enterprises	—		765,538		—		765,538
Obligations of states, municipalities and political subdivisions	—		3,733,183		—		3,733,183
Foreign governments	—		1,306,778		—		1,306,778
Commercial mortgage-backed securities	—		1,940,448		—		1,940,448
Residential mortgage-backed securities	—		526,793		—		526,793
Asset-backed securities	—		1,640		—		1,640
Corporate bonds	—		668,496		—		668,496
Total fixed maturity securities, available-for-sale	—		11,856,835		—		11,856,835
Equity securities:
Insurance, banks and other financial institutions	2,952,689		—		899		2,953,588
Industrial, consumer and all other	4,718,324		—		—		4,718,324
Total equity securities	7,671,013		—		899		7,671,912
Short-term investments, available-for-sale	2,510,164		159,098		—		2,669,262
Total investments	$	10,181,177	$	12,015,933	$	899	$	22,198,009

The following table summarizes changes in Level 3 investments measured at fair value on a recurring basis.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Equity securities, beginning of period	$	936	$	4,380	$	899	$	56,472
Purchases	—		—		—		—
Sales	—		(3,528)		—		(56,335)
Net investment gains	6		69		43		784
Equity securities, end of period	$	942	$	921	$	942	$	921

Previously, Level 3 investments included the Company's investment in an insurance-linked securities fund managed by Markel CATCo Investment Management Ltd. (MCIM). During the first quarter of 2022, the Company's remaining investment was redeemed ($41.3 million) in conjunction with a buy-out transaction that provided for an accelerated return of all remaining capital to investors. See note 11 for further details about the Company's Markel CATCo operations and the buy-out transaction.

The Company did not have any assets or liabilities measured at fair value on a non-recurring basis during the nine months ended September 30, 2023 and 2022.

5. Equity Method Investments

The Company holds certain investments that are accounted for under the equity method of accounting. The Company's equity method investments, which are included in other assets on the consolidated balance sheets, totaled $582.8 million and $494.0 million as of September 30, 2023 and December 31, 2022, respectively. The Company's proportionate share of earnings in its equity method investments was income of $4.2 million and losses of $0.4 million for the quarter and nine months ended September 30, 2023, respectively, and losses of $7.1 million and $36.1 million for the quarter and nine months ended September 30, 2022, respectively.

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The Company's most significant equity method investment is an investment in Hagerty, Inc. (Hagerty), which is accounted for on a quarter lag. Hagerty is an automotive enthusiast brand offering integrated membership products and programs as well as a specialty insurance provider focused on the global automobile enthusiast market. The Company's ownership interest in Hagerty's common stock was 23% as of September 30, 2023 and December 31, 2022. The Company's investment is comprised of Class A common shares, which are listed for trading on the New York Stock Exchange, as well as Class V common shares, associated with the Company's original investment, that have special voting rights and can be converted on a one-for-one basis into Class A common shares. The Company accounts for its investment under the equity method as it is deemed to have the ability to exercise significant influence over Hagerty's operating and financial policies through a combination of its voting interest, its right to designate a board member and business it conducts with Hagerty. As of September 30, 2023 and December 31, 2022, the carrying value of the Company's investment in Hagerty was $235.4 million and $245.1 million, respectively.

As of September 30, 2023 and December 31, 2022, the estimated value of the Company's investment, based on the closing stock price of Hagerty's Class A common shares, was $637.3 million and $656.0 million, respectively. See note 12 for further details regarding related party transactions with Hagerty.

6. Products, Services, and Other Revenues

The following tables present revenues from contracts with customers by type, all of which are included in products revenues and services and other revenues in the consolidated statements of income (loss) and comprehensive income (loss), along with a reconciliation to total products revenues and services and other revenues.

	Quarter Ended September 30,
	2023						2022
(dollars in thousands)	Markel Ventures		Other		Total		Markel Ventures		Other		Total
Products	$	585,707	$	—	$	585,707	$	575,277	$	—	$	575,277
Services	597,512		2,904		600,416		594,717		11,529		606,246
Investment management	—		44,204		44,204		—		15,641		15,641
Total revenues from contracts with customers	1,183,219		47,108		1,230,327		1,169,994		27,170		1,197,164
Program services and other fronting	—		39,499		39,499		—		40,033		40,033
Equity method investments income (loss)	(21)		4,264		4,243		(546)		(6,555)		(7,101)
Other	62,379		(9,297)		53,082		46,298		1,790		48,088
Total	$	1,245,577	$	81,574	$	1,327,151	$	1,215,746	$	62,438	$	1,278,184

	Nine Months Ended September 30,
	2023						2022
(dollars in thousands)	Markel Ventures		Other		Total		Markel Ventures		Other		Total
Products	$	1,921,773	$	—	$	1,921,773	$	1,809,276	$	—	$	1,809,276
Services	1,652,187		7,542		1,659,729		1,593,946		41,547		1,635,493
Investment management	—		76,108		76,108		—		55,197		55,197
Total revenues from contracts with customers	3,573,960		83,650		3,657,610		3,403,222		96,744		3,499,966
Program services and other fronting	—		105,952		105,952		—		103,096		103,096
Disposition gain	—		16,923		16,923		—		107,293		107,293
Equity method investments income (loss)	1,087		(1,485)		(398)		1,537		(37,639)		(36,102)
Other	160,282		(12,258)		148,024		122,670		10,773		133,443
Total	$	3,735,329	$	192,782	$	3,928,111	$	3,527,429	$	280,267	$	3,807,696

In February 2022, the Company sold the majority of its controlling interest in its Velocity managing general agent companies, which resulted in a gain of $107.3 million. In June 2023, the Company sold one of its licensed insurance subsidiaries to Velocity, which resulted in a gain of $16.9 million. Both gains were included in services and other revenues.

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Receivables from contracts with customers were $683.1 million and $624.1 million as of September 30, 2023 and December 31, 2022, respectively.

7. Unpaid Losses and Loss Adjustment Expenses

The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses.

	Nine Months Ended September 30,
(dollars in thousands)	2023		2022
Gross reserves for losses and loss adjustment expenses, beginning of year	$	20,947,898	$	18,178,894
Reinsurance recoverables on unpaid losses, beginning of year	7,994,884		6,876,317
Net reserves for losses and loss adjustment expenses, beginning of year	12,953,014		11,302,577
Effect of foreign currency rate changes on beginning of year balance	16,246		(275,364)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year	12,969,260		11,027,213
Incurred losses and loss adjustment expenses:
Current accident year	3,934,969		3,420,906
Prior accident years	(169,754)		(204,411)
Total incurred losses and loss adjustment expenses	3,765,215		3,216,495
Payments:
Current accident year	419,998		350,684
Prior accident years	2,018,199		1,880,471
Total payments	2,438,197		2,231,155
Effect of foreign currency rate changes on current year activity	416		(7,499)
Change in net reserves for losses and loss adjustment expenses of Markel CATCo Re (see note 11)	(146,895)		375,222
Reinsurance recoverable for retroactive reinsurance transaction	(125,067)		—
Net reserves for losses and loss adjustment expenses, end of period	14,024,732		12,380,276
Reinsurance recoverables on unpaid losses	8,119,634		7,814,098
Gross reserves for losses and loss adjustment expenses, end of period	$	22,144,366	$	20,194,374

For the nine months ended September 30, 2023, current accident year losses and loss adjustment expenses included $46.2 million of net losses and loss adjustment expenses attributed to the Hawaiian wildfires and Hurricane Idalia (2023 Catastrophes). The net losses and loss adjustment expenses attributed to the 2023 Catastrophes as of September 30, 2023 represent the Company's best estimate based upon information currently available. The estimate for these losses is based on preliminary industry loss estimates and output from industry, broker and proprietary models, as well as policy level reviews. This estimate is based on various assumptions about coverage and liability and is therefore subject to change. While the Company believes its net reserves for the 2023 Catastrophes as of September 30, 2023 are adequate, it continues to closely monitor reported claims and may adjust the estimate of net losses as new information becomes available.

During 2023, the Company also recognized losses on its intellectual property collateral protection insurance product written within the Insurance segment's professional liability product line. These losses reflect higher than anticipated levels of claims and loss experience, as well as the recognition of $25.0 million of credit losses in connection with a $50.0 million fraudulent letter of credit that was provided by an affiliate of Vesttoo Ltd. as collateral for reinsurance purchased on one of the policies that resulted in a claim during the quarter. An affiliate of Vesttoo Ltd. is also the counterparty to a second ceded reinsurance contract on this product line with an aggregate limit of $77.8 million for which the underlying letter of credit was also deemed to be fraudulent. Although a loss has not yet been incurred under this policy, the Company believes the potential for a covered loss event is reasonably possible. The Company is actively pursuing remedies to make recoveries on the reinsurance recoverable impacted by the fraudulent letter of credit and to mitigate the potential for additional losses resulting from the second fraudulent letter of credit if a claim is made under the related contract. The Company does not have any other ceded reinsurance contracts with Vesttoo Ltd. or its affiliates.

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For the nine months ended September 30, 2023, prior accident years losses and loss adjustment expenses included $169.8 million of favorable development on prior years loss reserves, which included $239.8 million of favorable development on the Company's professional liability, property, marine and energy, workers' compensation and personal lines product lines within its Insurance segment and $34.1 million of favorable development on the Company's professional liability and property product lines within its Reinsurance segment. Favorable development on prior years loss reserves for the nine months ended September 30, 2023 was partially offset by $70.5 million of adverse development on the Company's general liability product lines within its Insurance segment and $60.9 million of adverse development on the Company's public entity and general liability product lines within its Reinsurance segment.

In March 2023, the Company completed a retroactive reinsurance transaction to cede its portfolio of policies comprised of liabilities for its run-off book of United Kingdom motor casualty business in exchange for payments totaling $125.1 million, which approximated the carrying value of the Company's reserves for losses and loss adjustment expenses on the ceded policies.

For the nine months ended September 30, 2022, current accident year losses and loss adjustment expenses included $70.0 million and $35.0 million of net losses and loss adjustment expenses attributed to Hurricane Ian and the Russia-Ukraine conflict, respectively.

For the nine months ended September 30, 2022, prior accident years losses and loss adjustment expenses included $204.4 million of favorable development on prior years loss reserves, which included $155.0 million of favorable development on the Company's workers' compensation, property, marine and energy and programs product lines within the Insurance segment and $41.7 million of favorable development on the Company's property and credit and surety product lines within its Reinsurance segment.

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8. Reinsurance

The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Quarter Ended September 30,
	2023								2022
(dollars in thousands)	Direct		Assumed		Ceded		Net Premiums		Direct		Assumed		Ceded		Net Premiums
Underwriting:
Written	$	2,223,988	$	282,070	$	(478,035)	$	2,028,023	$	2,133,822	$	349,650	$	(473,885)	$	2,009,587
Earned	$	2,127,244	$	424,620	$	(429,901)	$	2,121,963	$	1,899,816	$	408,561	$	(351,118)	$	1,957,259
Program services and other fronting:
Written	615,424		557,324		(1,172,966)		(218)		663,631		327,668		(991,719)		(420)
Earned	669,544		313,079		(982,841)		(218)		729,312		218,439		(948,180)		(429)
Consolidated:
Written	$	2,839,412	$	839,394	$	(1,651,001)	$	2,027,805	$	2,797,453	$	677,318	$	(1,465,604)	$	2,009,167
Earned	$	2,796,788	$	737,699	$	(1,412,742)	$	2,121,745	$	2,629,128	$	627,000	$	(1,299,298)	$	1,956,830

	Nine Months Ended September 30,
	2023								2022
(dollars in thousands)	Direct		Assumed		Ceded		Net Premiums		Direct		Assumed		Ceded		Net Premiums
Underwriting:
Written	$	6,479,090	$	1,419,802	$	(1,444,626)	$	6,454,266	$	6,065,936	$	1,466,036	$	(1,255,226)	$	6,276,746
Earned	$	6,124,444	$	1,247,743	$	(1,250,605)	$	6,121,582	$	5,370,481	$	1,194,504	$	(1,012,485)	$	5,552,500
Program services and other fronting:
Written	2,012,806		991,305		(3,005,101)		(990)		2,025,195		595,940		(2,624,185)		(3,050)
Earned	1,960,219		546,871		(2,508,080)		(990)		2,036,016		332,415		(2,371,227)		(2,796)
Consolidated:
Written	$	8,491,896	$	2,411,107	$	(4,449,727)	$	6,453,276	$	8,091,131	$	2,061,976	$	(3,879,411)	$	6,273,696
Earned	$	8,084,663	$	1,794,614	$	(3,758,685)	$	6,120,592	$	7,406,497	$	1,526,919	$	(3,383,712)	$	5,549,704

Substantially all of the premiums written and earned in the Company's program services and other fronting operations for the nine months ended September 30, 2023 and 2022 were ceded. The percentage of consolidated ceded earned premiums to gross earned premiums was 40% and 38% for the quarter and nine months ended September 30, 2023, respectively, and 40% and 38% for the quarter and nine months ended September 30, 2022, respectively. The percentage of consolidated assumed earned premiums to net earned premiums was 35% and 29% for the quarter and nine months ended September 30, 2023, respectively, and 32% and 28% for the quarter and nine months ended September 30, 2022, respectively.

Substantially all of the incurred losses and loss adjustment expenses in the Company's program services and other fronting operations were ceded. These gross losses totaled $743.8 million and $1.8 billion for the quarter and nine months ended September 30, 2023, respectively, and $1.3 billion and $2.3 billion for the quarter and nine months ended September 30, 2022, respectively.

The following table summarizes the effect of reinsurance and retrocessional reinsurance on losses and loss adjustment expenses in the Company's underwriting operations.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Gross losses and loss adjustment expenses	$	1,684,389	$	1,423,526	$	4,552,926	$	3,760,566
Ceded losses and loss adjustment expenses	(278,945)		(238,220)		(786,876)		(544,109)
Net losses and loss adjustment expenses	$	1,405,444	$	1,185,306	$	3,766,050	$	3,216,457

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9. Life and Annuity Benefits

The Company's run-off block of life and annuity reinsurance contracts consists primarily of Euro and U.S. Dollar denominated life-contingent payout annuities and traditional and universal life contracts. The following table presents the components of the Company's liabilities for life and annuity benefits.

(dollars in thousands)	September 30, 2023		December 31, 2022
Liability for future policyholder benefits	$	508,436	$	554,366
Deferred profit liability	52,034		48,569
Other	39,786		47,786
Total	$	600,256	$	650,721

The primary component of the Company's liabilities for life and annuity benefits is the liability for future policyholder benefits. Life and annuity benefit reserves are calculated for aggregated cohorts of contracts, which are determined based on the attributes of the underlying contracts, and are discounted using standard actuarial techniques and cash flow models. Since the development of the life and annuity reinsurance reserves is based upon cash flow projection models, the Company makes estimates and assumptions based on cedent experience and industry mortality tables. The cash flow assumptions used to determine the Company's life and annuity benefit reserves are reviewed, and updated as necessary, at least annually. The discount rate assumptions are updated at each reporting date. There were no changes to the cash flow assumptions used to measure the Company's life and annuity benefit reserves as a result of the annual review of cash flow assumptions completed in the third quarter of 2023 and 2022. The following table presents a rollforward of the present value of the liability for future policyholder benefits.

	Nine Months Ended September 30,
(dollars in thousands)	2023		2022
Liability for future policyholder benefits, beginning of year	$	554,366	$	821,632
Liability for future policyholder benefits at original discount rate, beginning of year	667,761		745,313
Effect of changes in cash flow assumptions	—		—
Effect of actual variances from expected experience	(5,890)		(3,859)
Adjusted liability for future policyholder benefits, beginning of year	661,871		741,454
Interest accretion	11,251		11,909
Benefit payments	(39,819)		(40,643)
Effect of foreign currency rate changes	(356)		(77,166)
Liability for future policyholder benefits at original discount rate, end of period	632,947		635,554
Cumulative effect of changes in discount rate assumptions	(124,511)		(112,459)
Liability for future policyholder benefits, end of period (1)	$	508,436	$	523,095

(1)    The undiscounted liability for future policyholder benefits was $813.6 million and $822.3 million as of September 30, 2023 and 2022, respectively.

The following table summarizes additional details for the Company's liability for future policyholder benefits.

	September 30, 2023		December 31, 2022
Weighted-average interest rate:
Interest accretion rate	2.3	%	2.3	%
Current discount rate	4.7	%	4.3	%
Weighted-average liability duration	8.2 years		8.6 years

10. Senior Long-Term Debt and Other Debt

In March 2023, the Company retired its 3.625% unsecured senior notes due March 30, 2023 ($250.0 million aggregate principal outstanding at December 31, 2022).

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In June 2023, the Company entered into an amended and restated credit agreement for its corporate revolving credit facility, which provides up to $300 million of capacity for future acquisitions, investments and stock repurchases, and for other working capital and general corporate purposes. At the Company's discretion, up to $200 million of the total capacity may be used for letters of credit. The Company may increase the capacity of the facility by up to $200 million subject to obtaining commitments for the increase and certain other terms and conditions. The Company pays interest on balances outstanding under the facility and fees for letters of credit issued under the facility. The Company also pays a commitment fee on the unused portion of the facility based on the Company's leverage ratio as calculated under the credit agreement. The credit agreement includes financial covenants that require that the Company not exceed a maximum debt to capitalization (leverage) ratio and maintain a minimum amount of consolidated net worth, as well as other customary covenants and events of default. Markel Group guaranteed the obligations under the facility of certain subsidiaries that are also parties to the credit agreement. This facility expires in June 2028. The credit agreement for this revolving credit facility amended and restated the credit agreement for the Company's previous $300 million revolving credit facility. At September 30, 2023 and December 31, 2022, the Company had no borrowings outstanding under either revolving credit facility. As of September 30, 2023, the Company was in compliance with all covenants contained in its corporate revolving credit facility.

Various of the Company's Markel Ventures subsidiaries maintain revolving credit facilities or lines of credit, which provide up to $715 million of aggregate capacity for working capital and other general operational purposes. A portion of the capacity on certain of these credit facilities may be used as security for letters of credit and other obligations. At September 30, 2023 and December 31, 2022, the Company had $171.3 million and $238.1 million, respectively, of borrowings outstanding under these credit facilities. As of September 30, 2023, all of the Company's subsidiaries were in compliance with all covenants contained in their respective credit facilities.

11. Variable Interest Entities

MCIM, a wholly-owned consolidated subsidiary of the Company, is an insurance-linked securities investment fund manager and reinsurance manager headquartered in Bermuda. Results attributable to MCIM are not included in a reportable segment.

MCIM serves as the insurance manager for Markel CATCo Re Ltd. (Markel CATCo Re), a Bermuda Class 3 reinsurance company, and as the investment manager for Markel CATCo Reinsurance Fund Ltd., a Bermuda exempted mutual fund company comprised of multiple segregated accounts (Markel CATCo Funds). Voting shares in Markel CATCo Reinsurance Fund Ltd. and Markel CATCo Re are held by MCIM, which has the power to direct the activities that most significantly impact the economic performance of these entities. The Markel CATCo Funds issued multiple classes of nonvoting, redeemable preference shares to investors, and the Markel CATCo Funds are primarily invested in nonvoting preference shares of Markel CATCo Re. The underwriting results of Markel CATCo Re are attributed to investors through its nonvoting preference shares. Both Markel CATCo Re and the Markel CATCo Funds were placed into run-off in July 2019.

In March 2022, the Company completed a buy-out transaction with Markel CATCo Re and the Markel CATCo Funds that provided for an accelerated return of all remaining capital to investors in the Markel CATCo Funds. Under the terms of the transaction, the Company provided cash funding of $45.1 million to purchase substantially all of the Markel CATCo Funds' interests in Markel CATCo Re and substantially all of the preference shares held by investors in the Markel CATCo Funds were redeemed, including preference shares previously held by the Company. See note 4 for details regarding the Company's investment in the Markel CATCo Funds. In order to complete the transaction, the Company also made $101.9 million in additional payments, net of insurance proceeds, to or for the benefit of investors, which were recognized as an expense to the Company and included in services and other expenses for the first quarter of 2022.

In June 2022, the Company received a return of $24.9 million of the capital it provided in March 2022 and the related preference shares were redeemed. As of September 30, 2023 and December 31, 2022, the Company's investment in the remaining preference shares of Markel CATCo Re totaled $20.1 million, which comprised 25% and 23% of the equity of Markel CATCo Re, respectively. Through that investment, the Company has exposure to adverse loss development on reinsurance contracts previously written by Markel CATCo Re for loss events that occurred from 2014 to 2020. If loss reserves held by Markel CATCo Re are sufficient to settle claims on the remaining open contracts, the Company will receive a full return of the remaining $20.1 million in capital provided in March 2022. Favorable development on loss reserves held by Markel CATCo Re, less operating expenses, will be distributed to the Markel CATCo Funds, and ultimately to investors in the Markel CATCo Funds.

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Markel CATCo Re is considered a VIE, as the equity at risk does not have the right to receive residual returns that exceed the capital provided by the Company in the buy-out transaction. As a result of the preference shares acquired by the Company in the buy-out transaction, and the voting shares held by its consolidated subsidiary, MCIM, the Company consolidates Markel CATCo Re as its primary beneficiary. Results attributed to the run-off of Markel CATCo Re are reported with the Company's other ILS operations, within services and other revenues and expenses, and are not included in a reportable segment. Favorable loss reserve development on the run-off of reinsurance contracts written by Markel CATCo Re was $2.2 million and $55.7 million for the quarter and nine months ended September 30, 2023, respectively, and $53.4 million and $81.6 million for the quarter and nine months ended September 30, 2022, respectively. For all periods, the favorable development was included in services and other expenses and attributable to noncontrolling interests. During the nine months ended September 30, 2023 and 2022, $62.6 million and $22.3 million, respectively, of preference shares of Markel CATCo Re held by noncontrolling interests were redeemed.

The Company's consolidated balance sheets include the following amounts attributable to Markel CATCo Re.

(dollars in thousands)	September 30, 2023		December 31, 2022
Assets
Cash and cash equivalents	$	70,852	$	104,443
Restricted cash and cash equivalents	193,778		317,577
Other assets and receivables due from cedents	19,416		41,357
Total Assets	$	284,046	$	463,377
Liabilities and Equity
Unpaid losses and loss adjustment expenses	$	201,026	$	347,921
Other liabilities	1,232		26,717
Total Liabilities	202,258		374,638
Shareholders' equity	21,139		21,139
Noncontrolling interests	60,649		67,600
Total Equity	81,788		88,739
Total Liabilities and Equity	$	284,046	$	463,377

In connection with the buy-out transaction, the Company also entered into a tail risk cover with Markel CATCo Re. Through this contract, the Company has $142.7 million of uncollateralized exposure to adverse development on loss reserves held by Markel CATCo Re for loss exposures in excess of limits that the Company believes are unlikely to be exceeded.

12. Related Party Transactions

The Company engages in certain related party transactions in the normal course of business at arm's length.

Insurance-Linked Securities

Within the Company's insurance-linked securities operations, the Company provides investment and insurance management services through Nephila Holdings Ltd. (together with its subsidiaries, Nephila). Nephila serves as the investment manager to several Bermuda based private funds (the Nephila Funds). To provide access for the Nephila Funds to a variety of insurance-linked securities in the property catastrophe, climate and specialty markets, Nephila also acts as an insurance manager to certain Bermuda Class 3 and 3A reinsurance companies, Lloyd's Syndicate 2357 and Lloyd's Syndicate 2358 (collectively, the Nephila Reinsurers). Nephila receives management fees for investment and insurance management services provided through its insurance-linked securities operations primarily based on the net asset value of the accounts managed, and, for certain funds, incentive fees based on their annual performance. Prior to the disposition of Velocity in February 2022, Nephila also provided managing general agent services to the Nephila Reinsurers in exchange for commissions. For the quarter and nine months ended September 30, 2023, total revenues attributed to unconsolidated entities managed by Nephila were $43.6 million and $74.1 million, respectively. For the quarter and nine months ended September 30, 2022, total revenues attributed to unconsolidated entities managed by Nephila were $17.1 million and $57.0 million, respectively.

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Through the Company's program services and other fronting operations, as well as its underwriting operations, the Company has programs with Nephila through which the Company writes insurance policies that are either partially or fully ceded to Nephila Reinsurers. Through these programs, Nephila utilizes certain of the Company's licensed insurance companies to write U.S. catastrophe-exposed property risk that is then ceded to Nephila Reinsurers. A portion of this business is placed by Velocity, which the Company retained a minority interest in following its disposition. Additionally, through the Company's insurance underwriting operations, the Company has a quota share agreement with Nephila through which it cedes a portion of its property business to Nephila Reinsurers. The following table summarizes the premiums ceded to Nephila Reinsurers.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Program services and other fronting:
Gross and ceded written premiums attributable to Nephila programs	$	501,838	$	398,872	$	1,036,126	$	889,644
Underwriting:
Premiums ceded to Nephila Reinsurers	$	10,058	$	15,037	$	39,905	$	44,656

As of September 30, 2023 and December 31, 2022, reinsurance recoverables on the consolidated balance sheets included $874.1 million and $1.4 billion, respectively, due from Nephila Reinsurers. Under its programs with Nephila Reinsurers, the Company bears underwriting risk for annual aggregate agreement year losses in excess of a limit the Company believes is unlikely to be exceeded. To the extent losses under these programs exceed the prescribed limits, the Company is obligated to pay such losses to the cedents without recourse to the Nephila Reinsurers. While the Company believes losses under these programs are unlikely, those losses, if incurred, could be material to the Company's consolidated results of operations and financial condition.

The Company has also entered into other assumed and ceded reinsurance transactions with the Nephila Reinsurers in the normal course of business, which are not material to the Company's consolidated financial statements.

In June 2023, the Company sold one of the licensed insurance subsidiaries within its program services operations to Velocity, which resulted in a gain of $16.9 million during the second quarter of 2023.

Hagerty

The Company holds a minority ownership interest in Hagerty, which operates primarily as a managing general agent and also includes Hagerty Reinsurance Limited (Hagerty Re), a Bermuda Class 3 reinsurance company. Through the Company's underwriting operations, the Company underwrites insurance for Hagerty, a portion of which is ceded to Hagerty Re. The amounts attributed to these arrangements are summarized in the following table.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Gross written premiums attributable to Hagerty	$	227,693	$	197,041	$	628,889	$	540,447
Premiums ceded to Hagerty Re	$	174,455	$	130,430	$	480,924	$	357,729

As of September 30, 2023 and December 31, 2022, reinsurance recoverables on the consolidated balance sheets included $200.0 million and $159.7 million, respectively, due from Hagerty Re.

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13. Shareholders' Equity

a) The Company has 50,000,000 shares of no par value common stock authorized. The following table presents a rollforward of changes in common shares issued and outstanding.

	Quarter Ended September 30,		Nine Months Ended September 30,
(shares in ones)	2023	2022	2023	2022
Issued and outstanding common shares, beginning of period	13,284,998	13,537,895	13,422,692	13,631,740
Issuance of common shares	3,007	694	5,475	2,886
Repurchase of common shares	(56,483)	(67,696)	(196,645)	(163,733)
Issued and outstanding common shares, end of period	13,231,522	13,470,893	13,231,522	13,470,893

b) The Company also has 10,000,000 shares of no par value preferred stock authorized, of which 600,000 shares were issued and outstanding at September 30, 2023 and December 31, 2022. The Company declared and paid dividends on preferred shares of $18.0 million, or $30 per share, in both the second quarter of 2023 and 2022.

c) Net income (loss) per common share was determined by dividing adjusted net income (loss) to common shareholders by the applicable weighted average common shares outstanding. Basic common shares outstanding include restricted stock units that are no longer subject to any contingencies for issuance, but for which corresponding shares have not been issued. Diluted net income (loss) per common share is computed by dividing adjusted net income (loss) to common shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the period. The following table presents net income (loss) per common share and diluted net income (loss) per common share.

	Quarter Ended September 30,				Nine Months Ended September 30,
(in thousands, except per share amounts)	2023		2022		2023		2022
Net income (loss) to common shareholders	$	42,591	$	59,594	$	1,208,754	$	(925,943)
Adjustment of redeemable noncontrolling interests	(628)		(17,730)		7,087		(62,168)
Adjusted net income (loss) to common shareholders	$	41,963	$	41,864	$	1,215,841	$	(988,111)
Basic common shares outstanding	13,315		13,564		13,382		13,609
Dilutive potential common shares from restricted stock units and restricted stock (1)	30		31		24		—
Diluted common shares outstanding	13,345		13,595		13,406		13,609
Basic net income (loss) per common share	$	3.15	$	3.09	$	90.86	$	(72.61)
Diluted net income (loss) per common share (1)	$	3.14	$	3.08	$	90.69	$	(72.61)

(1)     The impact of 28 thousand shares from restricted stock units and restricted stock was excluded from the computation of diluted net loss per common share for the nine months ended September 30, 2022 because the effect would have been anti-dilutive.

14. Contingencies

Contingencies arise in the normal course of the Company's operations and are not expected to have a material impact on the Company's financial condition or results of operations.

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

The following discussion and analysis should be read in conjunction with the consolidated financial statements and related notes included under Item 1 Financial Statements and our 2022 Annual Report on Form 10-K. The accompanying consolidated financial statements and related notes have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) and include the accounts of Markel Group Inc., formerly Markel Corporation, and its consolidated subsidiaries, as well as any variable interest entities that meet the requirements for consolidation. Effective May 26, 2023, Markel Corporation changed its name to Markel Group Inc. (Markel Group). This section is divided into the following sections:

•Our Business

•Results of Operations

•Financial Condition

•Critical Accounting Estimates

•Safe Harbor and Cautionary Statement

Our Business

Markel Group is a holding company comprised of a diverse family of businesses and investments. The leadership teams of our businesses operate with a high degree of independence, while at the same time living the values that we call the Markel Style. Our specialty insurance business sits at the core of our company. Through decades of sound underwriting, the insurance team has provided the capital base from which we built a system of businesses and investments that collectively increase Markel Group's durability and adaptability. We aspire to build one of the world's great companies by enabling our customers, associates and shareholders to win and deploy three financial engines in pursuit of this goal.

Insurance - Our principal business markets and underwrites specialty insurance products using multiple platforms that enable us to best match risk and capital.

Investments - Our investing activities are primarily related to our underwriting operations. The majority of our investable assets come from premiums paid by policyholders and the remainder is comprised of shareholder funds.

Markel Ventures - Through our Markel Ventures operations, we own controlling interests in a diverse portfolio of businesses that operate in a variety of industries.

Our three interdependent engines form a system that provides diverse income streams, access to a wide range of investment opportunities and the ability to efficiently move capital to the best ideas across the Company. We allocate capital across the Company using a four-step process that we have consistently followed for years: invest in our existing businesses for organic growth opportunities, acquire controlling interests in businesses, build our portfolio of equity securities, and repurchase shares of our common stock. Our system is uniquely equipped for long-term growth. To mitigate effects of short-term volatility and align with the long-term perspective that we apply to operating our businesses, we generally use five-year time periods to measure our performance. We measure financial success by our ability to grow the market price per common share of our stock, or total shareholder return, at high rates of return over a long period of time. Over the five-year period ended September 30, 2023, our common share price increased at a compound annual rate of 4%. While this measure, considered independently of other factors, falls below our internal targets, we believe the operating performance at all three of our engines positions us well to achieve our targets over the long-term. We also consider the performance of book value per common share over the long-term, although we believe that as our business has evolved, this measure has become less reflective of shareholder value because a significant portion of our operations is not recorded at fair value. Over the five-year period ended September 30, 2023, the compound annual growth in book value per common share was 8%.

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Insurance

Our insurance engine is comprised of the following types of operations:

•Underwriting - Our underwriting operations are comprised of our risk-bearing insurance and reinsurance operations.

•Insurance-linked securities - Our insurance-linked securities (ILS) operations provide investment management services for a variety of investment products, including insurance-linked securities, catastrophe bonds, insurance swaps and weather derivatives.

•Program services - Our program services business serves as a fronting platform that provides other insurance entities access to the U.S. property and casualty insurance market.

Through our underwriting, ILS and program services operations, we have a suite of capabilities through which we can access capital to support our customers' risks, which includes our own capital through our underwriting operations, as well as third-party capital through our ILS and program services operations. Within each of these insurance platforms, we believe that our specialty product focus and niche market strategy enable us to develop expertise and specialized market knowledge. We seek to differentiate ourselves from competitors by our expertise, service, continuity and other value-based considerations, including the multiple platforms through which we can manage risk and deploy capital. For example, through our program services platform, we have programs through which we write insurance policies on behalf of our ILS operations that are supported by third-party capital. Additionally, we cede certain risks written through our underwriting operations to our ILS operations to the extent those risks are more aligned with the risk profile of our ILS investors than our own corporate tolerance. Our ability to access multiple insurance platforms allows us to achieve income streams from our insurance operations beyond the traditional underwriting model. We believe this multi-platform approach provides us with a unique advantage through which we have the ability to unlock additional value for our customers and business partners, which we refer to as "the power of the platform."

Underwriting

Our chief operating decision maker reviews our ongoing underwriting operations on a global basis in the following two segments: Insurance and Reinsurance. In determining how to allocate resources and assess the performance of our underwriting results, we consider many factors, including the nature of the insurance product sold, the type of account written and the type of customer served. The Insurance segment includes all direct business and facultative placements written on a risk-bearing basis within our underwriting operations. The Reinsurance segment includes all treaty reinsurance written on a risk-bearing basis within our underwriting operations.

Our Insurance segment includes both hard-to-place risks written outside of the standard market on an excess and surplus lines basis and unique and hard-to-place risks that are typically written on an admitted basis due to marketing and regulatory reasons. Risks written in our Insurance segment are written on either a direct basis or a subscription basis, the latter of which means that the loss exposures brought into the market are typically insured by more than one insurance company or Lloyd's of London (Lloyd's) syndicate. When we write business in the subscription market, we prefer to participate as lead underwriter in order to control underwriting terms, policy conditions and claims handling. The following products are included in this segment: professional liability, general liability, personal lines, marine and energy, primary and excess of loss property, workers' compensation, credit and surety coverages, specialty program insurance for well-defined niche markets and liability and other coverages tailored for unique exposures. Business in this segment is primarily written through our Markel Specialty and Markel International divisions. The Markel Specialty division writes business on both an excess and surplus lines and admitted basis, primarily through our platforms in the United States and Bermuda, as well as the United Kingdom (U.K.) and European Union. The Markel International division writes business worldwide from our London and Munich-based platforms, which include branch offices around the world. The Insurance segment also includes collateral protection insurance written on an admitted basis through our State National division.

Our Reinsurance segment includes casualty and specialty treaty reinsurance products offered to other insurance and reinsurance companies globally through the broker market. Our treaty reinsurance offerings include both quota share and excess of loss reinsurance and are typically written on a participation basis, which means each reinsurer shares proportionally in the business ceded under the reinsurance treaty written. Business in this segment is primarily written by our Global Reinsurance division. Principal lines of business include: professional liability, general liability, credit and surety, marine and energy and workers' compensation.

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Insurance-Linked Securities

Our insurance-linked securities operations are primarily comprised of our Nephila operations and are not included in a reportable segment. Nephila Holdings Ltd. (together with its subsidiaries, Nephila) provides investment and insurance management services through which we offer alternative capital to the reinsurance market while providing investors with investment strategies that typically are uncorrelated with traditional asset classes. We receive management fees for investment and insurance management services provided through these operations primarily based on the net asset value of the accounts managed, and for certain funds, incentive fees based on their annual performance.

Nephila serves as the investment manager to several Bermuda-based private funds (the Nephila Funds). To provide access for the Nephila Funds to a variety of insurance-linked securities in the property catastrophe, climate and specialty markets, Nephila acts as an insurance manager to certain Bermuda Class 3 and 3A reinsurance companies, Lloyd's Syndicate 2357 and Lloyd's Syndicate 2358 (collectively, the Nephila Reinsurers). The results of the Nephila Reinsurers are attributed to the Nephila Funds primarily through derivative transactions between these entities. Neither the Nephila Funds nor the Nephila Reinsurers are subsidiaries of Markel Group, and as such, these entities are not included in our consolidated financial statements. The Nephila Reinsurers subscribe to various reinsurance contracts based on their investors' risk profiles, including property reinsurance business fronted through our underwriting and program services platforms. See note 12 of the notes to consolidated financial statements for further details regarding transactions with entities managed through our Nephila operations.

Nephila also served as a managing general agent prior to the sales of our Velocity managing general agent operations in February 2022 and our Volante managing general agent operations in October 2022.

Our insurance-linked securities operations also include our run-off Markel CATCo operations, the results of which are reported separately from our ongoing insurance-linked securities operations. Our Markel CATCo operations are conducted through Markel CATCo Investment Management Ltd. (MCIM), an ILS investment fund manager headquartered in Bermuda. MCIM serves as the insurance manager for Markel CATCo Re Ltd. (Markel CATCo Re), a Bermuda Class 3 reinsurance company, and as the investment manager for Markel CATCo Reinsurance Fund Ltd., a Bermuda exempted mutual fund company comprised of multiple segregated accounts (Markel CATCo Funds). In July 2019, these operations were placed into run-off. In March 2022, we completed a buy-out transaction that provided for an accelerated return of all remaining capital to investors in the Markel CATCo Funds. Following the completion of the buy-out transaction, we consolidate Markel CATCo Re as its primary beneficiary. Results attributable to the run-off of Markel CATCo Re are included with our other Markel CATCo operations within services and other expenses, and for the nine months ended September 30, 2023 and 2022, these results were entirely attributable to noncontrolling interest holders in Markel CATCo Re. In connection with the buy-out transaction, we entered into a tail risk cover with Markel CATCo Re through which we have uncollateralized exposure to adverse development on loss reserves held by Markel CATCo Re for loss exposures in excess of limits that we believe are unlikely to be exceeded. See note 11 of the notes to consolidated financial statements for further details regarding our Markel CATCo operations and the consolidation of Markel CATCo Re.

Program Services and Other Fronting

Our program services business, which is provided through our State National division, generates fee income in the form of ceding fees in exchange for fronting insurance business to other insurance carriers (capacity providers), including the Nephila Reinsurers. In general, fronting refers to business in which we write insurance on behalf of a general agent or capacity provider and then cede all, or substantially all, of the risk under these policies to the capacity provider in exchange for ceding fees. These capacity providers are domestic and foreign insurers and institutional risk investors that want to access specific lines of U.S. property and casualty insurance business but may not have the required licenses and filings to do so. The results of our program services operations are not included in a reportable segment.

In certain instances, we also leverage the strength of our underwriting platform to write business on behalf of our ILS operations, in exchange for ceding fees, to support their business plans and assist in meeting their desired return objectives. This fronting business is conducted separately from our program services business and consists of catastrophe-exposed property insurance and reinsurance business and specialty reinsurance business.

Although we reinsure substantially all of the risks inherent in our program services business and ILS fronting arrangements, we have certain programs that contain limits on our reinsurers' obligations to us that expose us to underwriting risk, including loss ratio caps, aggregate reinsurance limits or exclusion of the credit risk of producers. Under certain programs, including programs and contracts with Nephila Reinsurers, we also bear underwriting risk for annual aggregate agreement year losses in excess of a limit that we believe is unlikely to be exceeded. See note 12 of the notes to consolidated financial statements for further details regarding our programs with Nephila Reinsurers.

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Investments

The majority of our investable assets come from premiums paid by policyholders. We rely on sound underwriting practices to produce investable funds. Policyholder funds are invested predominantly in high-quality government and municipal bonds and mortgage-backed securities that generally match the duration and currency of our loss reserves. We typically hold these fixed maturity investments until maturity. As a result, unrealized holding gains and losses on these securities are generally expected to reverse as the securities mature. Premiums collected through our underwriting operations may also be held as short-term investments or cash and cash equivalents to provide short-term liquidity for projected claims payments, reinsurance costs and operating expenses. The balance of our investable assets, comprised of shareholder funds, is available to be invested in equity securities, which over the long run, have produced higher returns relative to fixed maturity and short-term investments. When purchasing equity securities, we seek to invest in profitable companies, with honest and talented management, that exhibit reinvestment opportunities and capital discipline, at reasonable prices. We intend to hold these equity investments over the long-term. Substantially all of our investment portfolio is managed by company employees.

Markel Ventures

Through our wholly owned subsidiary, Markel Ventures, Inc. (Markel Ventures), we own controlling interests in high-quality businesses that operate in a variety of different industries with shared values and the shared goal of positively contributing to the long-term financial performance of Markel Group. Management teams for each business operate autonomously and are responsible for developing strategic initiatives, managing day-to-day operations and making investment and capital allocation decisions for their respective companies.

Our corporate management team is responsible for decisions regarding allocation of capital for acquisitions and new investments. Our strategy in making these acquisitions is similar to our strategy for purchasing equity securities. We seek to invest in profitable companies, with honest and talented management, that exhibit reinvestment opportunities and capital discipline, at reasonable prices. We intend to own the businesses acquired for a long period of time. Our chief operating decision maker allocates resources to and assesses the performance of these various businesses in the aggregate as the Markel Ventures segment.

The Markel Ventures segment includes a diverse portfolio of specialized businesses from different industries that offer various types of products and services to businesses and consumers across many markets. The following types of businesses are included in this segment: construction services, consumer and building products, transportation-related products, consulting services and equipment manufacturing products. All of our businesses in this segment are headquartered in the U.S., with subsidiaries of certain businesses located outside of the U.S.

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Results of Operations

The following table presents the components of operating revenues.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Insurance segment	$	1,848,267	$	1,695,029	$	5,322,377	$	4,742,178
Reinsurance segment	274,161		260,535		799,683		808,656
Insurance-linked securities, program services and other insurance	85,924		68,587		205,105		306,727
Insurance operations	2,208,352		2,024,151		6,327,165		5,857,561
Net investment income	191,015		112,297		518,536		301,289
Net investment gains (losses)	(265,917)		(281,483)		591,173		(2,194,525)
Other	(5,033)		(4,883)		(13,791)		(27,590)
Investing segment	(79,935)		(174,069)		1,095,918		(1,920,826)
Markel Ventures segment	1,246,769		1,216,063		3,738,028		3,527,853
Total operating revenues	$	3,375,186	$	3,066,145	$	11,161,111	$	7,464,588

The following table presents the components of comprehensive income (loss) to shareholders.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Insurance segment profit	$	25,092	$	85,537	$	256,247	$	439,445
Reinsurance segment profit (loss)	(5,812)		43,255		33,606		60,377
Insurance-linked securities, program services and other insurance	50,590		76,597		154,718		128,549
Amortization of intangible assets (1)	(24,427)		(24,851)		(73,839)		(74,913)
Insurance operations	45,443		180,538		370,732		553,458
Investing segment profit (loss)	(79,935)		(174,069)		1,095,918		(1,920,826)
Markel Ventures segment profit (2)	107,302		60,459		330,120		217,242
Interest expense	(44,553)		(47,348)		(141,212)		(147,090)
Net foreign exchange gains (losses)	39,246		113,635		(8,658)		241,706
Income tax (expense) benefit	(14,235)		(16,460)		(339,903)		240,629
Net income attributable to noncontrolling interests	(10,677)		(57,161)		(80,243)		(93,062)
Net income (loss) to shareholders	42,591		59,594		1,226,754		(907,943)
Preferred stock dividends	—		—		(18,000)		(18,000)
Net income (loss) to common shareholders	42,591		59,594		1,208,754		(925,943)
Other comprehensive loss to shareholders	(150,091)		(407,553)		(123,340)		(1,169,618)
Comprehensive income (loss) to shareholders	$	(107,500)	$	(347,959)	$	1,103,414	$	(2,077,561)

(1)    Amortization of intangible assets includes all amortization attributable to our insurance operations. Amortization of intangible assets attributable to our underwriting segments was $9.1 million and $28.0 million for the quarter and nine months ended September 30, 2023, respectively, and $9.6 million and $29.0 million for the quarter and nine months ended September 30, 2022, respectively; however, we do not allocate amortization of intangible assets between the Insurance and Reinsurance segments. Amortization of intangible assets attributable to our insurance-linked securities, program services and other insurance operations was $15.3 million and $45.9 million for the quarter and nine months ended September 30, 2023, respectively, and $15.3 million and $45.9 million for the quarter and nine months ended September 30, 2022, respectively.

(2)    Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures.

The decrease in comprehensive loss to shareholders for the third quarter of 2023 compared to the third quarter of 2022 was primarily due to pre-tax net unrealized losses on our fixed maturity securities of $208.6 million in 2023 compared to $530.2 million in 2022, as well as lower underwriting income in 2023 compared to 2022.

The change in comprehensive income (loss) to shareholders for the nine months ended September 30, 2023 compared to the nine months ended September 30, 2022 was primarily due to pre-tax net investment gains on our equity securities of $629.3 million in 2023 compared to pre-tax net investment losses on our equity securities of $2.2 billion in 2022, as well as pre-tax net unrealized losses on our fixed maturity securities of $167.4 million in 2023 compared to $1.6 billion in 2022.

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The components of net income (loss) to shareholders and comprehensive income (loss) to shareholders are discussed in further detail under "Insurance Results," "Investing Results," "Markel Ventures Results," "Interest Expense, Net Foreign Exchange Gains (Losses) and Income Taxes" and "Comprehensive Income (Loss) to Shareholders and Book Value per Common Share."

Insurance Results

Our Insurance engine includes our underwriting, insurance-linked securities, program services and other fronting operations. We have a suite of capabilities through which we can access capital to support our customers' risks, which includes our own capital through our underwriting operations and third-party capital through our ILS and program services operations. Our underwriting operations, which are primarily comprised of our Insurance and Reinsurance segments, produce revenues primarily by underwriting insurance contracts and earning premiums in the specialty insurance market. Our insurance-linked securities and program services operations produce revenues primarily through fees earned for investment management services and fronting services, respectively. Our insurance operations also include the underwriting results of run-off lines of business that were discontinued prior to, or in conjunction with, insurance acquisitions, and the results of our run-off life and annuity reinsurance business.

The following table presents the components of our Insurance engine gross premium volume and operating revenues.

	Quarter Ended September 30,						Nine Months Ended September 30,
(dollars in thousands)	2023		2022		% Change		2023		2022		% Change
Gross premium volume:
Underwriting	$	2,506,058	$	2,483,472	1	%	$	7,898,892	$	7,531,972	5	%
Program services and other fronting (1)	1,172,748		991,299		18	%	3,004,111		2,621,135		15	%
Insurance operations	$	3,678,806	$	3,474,771	6	%	$	10,903,003	$	10,153,107	7	%
Operating revenues:
Insurance segment	$	1,848,267	$	1,695,029	9	%	$	5,322,377	$	4,742,178	12	%
Reinsurance segment	274,161		260,535		5	%	799,683		808,656		(1)	%
Insurance-linked securities, program services and other insurance	85,924		68,587		25	%	205,105		306,727		(33)	%
Insurance operations	$	2,208,352	$	2,024,151	9	%	$	6,327,165	$	5,857,561	8	%

(1)    Substantially all gross premiums from our program services business and other fronting arrangements were ceded to third parties for the quarter and nine months ended September 30, 2023 and 2022.

Underwriting Results

Underwriting profits are a key component of our strategy to build shareholder value. We believe that the ability to achieve consistent underwriting profits demonstrates knowledge and expertise, commitment to superior customer service and the ability to manage insurance risk. The property and casualty insurance industry commonly defines underwriting profit or loss as earned premiums net of losses and loss adjustment expenses and underwriting, acquisition and insurance expenses. We use underwriting profit or loss and the combined ratio as a basis for evaluating our underwriting performance. The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums. The combined ratio is the sum of the loss ratio and the expense ratio. The loss ratio represents the relationship of incurred losses and loss adjustment expenses to earned premiums. The expense ratio represents the relationship of underwriting, acquisition and insurance expenses to earned premiums. A combined ratio less than 100% indicates an underwriting profit, while a combined ratio greater than 100% reflects an underwriting loss.

In addition to the U.S. GAAP combined ratio, loss ratio and expense ratio, we also evaluate our underwriting performance using measures that exclude the impacts of certain items on these ratios. We believe these adjusted measures, which are non-GAAP measures, provide financial statement users with a better understanding of the significant factors that comprise our underwriting results and how management evaluates underwriting performance.

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When analyzing our combined ratio, we exclude current accident year losses and loss adjustment expenses attributed to natural catastrophes and certain significant, infrequent loss events, for example, the military conflict between Russia and Ukraine that began following Russia's invasion of Ukraine in February 2022. Due to the unique characteristics of a catastrophe loss and other significant, infrequent events, there is inherent variability as to the timing or loss amount, which cannot be predicted in advance. We believe measures that exclude the effects of such events are meaningful to understand the underlying trends and variability in our underwriting results that may be obscured by these items.

When analyzing our loss ratio, we evaluate losses and loss adjustment expenses attributable to the current accident year separate from losses and loss adjustment expenses attributable to prior accident years. Prior accident year reserve development, which can either be favorable or unfavorable, represents changes in our estimates of losses and loss adjustment expenses related to loss events that occurred in prior years. We believe a discussion of current accident year loss ratios, which exclude prior accident year reserve development, is helpful since it provides more insight into estimates of current underwriting performance and excludes changes in estimates related to prior year loss reserves. We also analyze our current accident year loss ratio excluding losses and loss adjustment expenses attributable to catastrophes and, in 2022, the Russia-Ukraine conflict. The current accident year loss ratio excluding the impact of catastrophes and other significant, infrequent loss events is also commonly referred to as an attritional loss ratio within the property and casualty insurance industry.

The following table presents summary data for our consolidated underwriting operations, which are comprised predominantly of our Insurance and Reinsurance segments. Our consolidated underwriting results also include results from discontinued lines of business and the retained portion of our program services operations.

	Quarter Ended September 30,								Nine Months Ended September 30,
(dollars in thousands)	2023			2022			% Change		2023			2022			% Change
Gross premium volume	$	2,505,840		$	2,483,052		1	%	$	7,897,902		$	7,528,922		5	%
Net written premiums	$	2,027,805		$	2,009,167		1	%	$	6,453,276		$	6,273,696		3	%
Earned premiums	$	2,121,745		$	1,956,830		8	%	$	6,120,592		$	5,549,704		10	%
Underwriting profit	$	19,291		$	128,245		(85)	%	$	283,656		$	490,103		(42)	%
Underwriting Ratios (1)							Point Change								Point Change
Loss ratio
Current accident year loss ratio	67.6		%	64.7		%	2.9		64.3		%	61.6		%	2.7
Prior accident years loss ratio	(1.4)		%	(4.2)		%	2.8		(2.8)		%	(3.7)		%	0.9
Loss ratio	66.2		%	60.6		%	5.6		61.5		%	58.0		%	3.5
Expense ratio	32.9		%	32.9		%	—		33.8		%	33.2		%	0.6
Combined ratio	99.1		%	93.4		%	5.7		95.4		%	91.2		%	4.2
Current accident year loss ratio catastrophe impact (2)	2.2		%	3.6		%	(1.4)		0.8		%	1.3		%	(0.5)
Current accident year loss ratio Russia-Ukraine conflict impact (2)	—		%	—		%	—		—		%	0.6		%	(0.6)
Current accident year loss ratio, excluding catastrophes and Russia-Ukraine conflict impact	65.5		%	61.2		%	4.3		63.5		%	59.7		%	3.8
Combined ratio, excluding current year catastrophes and Russia-Ukraine conflict impact	96.9		%	89.9		%	7.0		94.6		%	89.3		%	5.3

(1)    Amounts may not reconcile due to rounding.

(2)    The point impact of catastrophes and the Russia-Ukraine conflict is calculated as the associated net losses and loss adjustment expenses divided by total earned premiums.

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Premiums

The increase in gross premium volume in our underwriting operations for the quarter and nine months ended September 30, 2023 was driven by growth within our Insurance segment, partially offset by lower gross premium volume within our Reinsurance segment. Net retention of gross premium volume in our underwriting operations was 81% for both the quarter ended September 30, 2023 and 2022. Net retention of gross premium volume in our underwriting operations was 82% for the nine months ended September 30, 2023 compared to 83% for the same period of 2022. The decrease in net retention for the nine months ended September 30, 2023 was driven by lower retention within our Insurance segment. Within our underwriting operations, we purchase reinsurance and retrocessional reinsurance to manage our net retention on individual risks and overall exposure to losses and to enable us to write policies with sufficient limits to meet policyholder needs. The increase in earned premiums in our underwriting operations for the quarter and nine months ended September 30, 2023 was primarily attributable to higher gross premium volume in recent periods.

Throughout 2023, we have achieved modest rate increases across the landscape of our diversified product portfolio. Rate trends by product class are more divergent in the current pricing environment in contrast to the past few years, where we experienced rate increases across most of our product lines. These more nuanced rate trends, coupled with increases in loss cost trends due to heightened economic and social inflation, have forced us to examine each of our product classes more closely and target premium growth in product lines where we are most confident in the levels of rate adequacy.

We are achieving significant rate increases on our property coverages and select marine and energy product lines, due to recent industry loss experience and the increasing cost of obtaining reinsurance protection, leading us to pursue opportunistic growth within these product lines. Additionally, within our general liability product lines, we continue to achieve modest rate increases across most product classes and have seen the level of rate increases improve over the course of the year. We have maintained modest growth in these product lines, while carefully selecting risks, managing limits and adjusting attachment points in response to heightened loss cost trends, including the impact of social inflation, within general liability lines.

Within our insurance and reinsurance professional liability product lines, overall, we have seen modest rate decreases driven by notable rate decreases within our public directors and officers product, consistent with broader trends across the industry, and, to a lesser extent, within our errors and omissions coverages. Within these products, we are contracting our new premium writings when we believe rates are inadequate and are also allowing business to lapse. In other professional liability product lines, particularly within our international portfolio, we are generally seeing consistency in rates and are continuing to pursue growth opportunities where we find the business to be adequately priced. We also are seeing moderate rate decreases globally within our cyber product line in response to several years of significant rate increases and strong industry underwriting performance. Despite these current trends, we view cyber as a long-term growth opportunity. Finally, we continue to realize low single digit rate decreases within our workers' compensation product line and are reacting accordingly on a state-by-state basis to maintain profitability.

Combined Ratio

Underwriting results for the quarter and nine months ended September 30, 2023 included $46.2 million of net losses and loss adjustment expenses attributed to the Hawaiian wildfires and Hurricane Idalia (2023 Catastrophes). Underwriting results for the quarter and nine months ended September 30, 2022 included $70.0 million of net losses and loss adjustment expenses attributed to Hurricane Ian. Underwriting results for the nine months ended September 30, 2022 also included $35.0 million of net losses and loss adjustment expenses attributed to the Russia-Ukraine conflict. Excluding these losses attributed to natural catastrophes, the increase in our consolidated combined ratio for the quarter ended September 30, 2023 compared to the same period of 2022 was primarily driven by a higher attritional loss ratio within our Insurance segment and the impact of adverse development on prior accident years loss reserves in 2023 compared to favorable development in 2022 within our Reinsurance segment. For the nine months ended September 30, 2023, the increase in our consolidated combined ratio, excluding these losses attributed to natural catastrophes and the Russia-Ukraine conflict, compared to the same period of 2022 was primarily driven by a higher attritional loss ratio across both our underwriting segments.

The net losses and loss adjustment expenses attributed to the 2023 Catastrophes as of September 30, 2023 represent our best estimate based upon information currently available. Our estimate for these losses is based on preliminary industry loss estimates and output from industry, broker and proprietary models, as well as policy level reviews. This estimate is based on various assumptions about coverage and liability and is therefore subject to change. While we believe our net reserves for the 2023 Catastrophes as of September 30, 2023 are adequate, we continue to closely monitor reported claims and may adjust our estimate of net losses as new information becomes available.

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Insurance Segment

	Quarter Ended September 30,								Nine Months Ended September 30,
(dollars in thousands)	2023			2022			% Change		2023			2022			% Change
Gross premium volume	$	2,372,941		$	2,299,325		3	%	$	6,926,282		$	6,479,789		7	%
Net written premiums	$	1,915,212		$	1,849,983		4	%	$	5,563,881		$	5,289,165		5	%
Earned premiums	$	1,848,267		$	1,695,029		9	%	$	5,322,377		$	4,742,178		12	%
Underwriting profit	$	25,092		$	85,537		(71)	%	$	256,247		$	439,445		(42)	%
Underwriting Ratios (1)							Point Change								Point Change
Loss ratio
Current accident year loss ratio	68.1		%	64.9		%	3.2		64.2		%	61.3		%	2.9
Prior accident years loss ratio	(3.0)		%	(3.2)		%	0.2		(3.4)		%	(4.1)		%	0.7
Loss ratio	65.1		%	61.8		%	3.3		60.8		%	57.1		%	3.7
Expense ratio	33.5		%	33.2		%	0.3		34.4		%	33.6		%	0.8
Combined ratio	98.6		%	95.0		%	3.6		95.2		%	90.7		%	4.5
Current accident year loss ratio catastrophe impact (2)	2.4		%	4.1		%	(1.7)		0.8		%	1.5		%	(0.7)
Current accident year loss ratio Russia-Ukraine conflict impact (2)	—		%	—		%	—		—		%	0.4		%	(0.4)
Current accident year loss ratio, excluding catastrophes and Russia-Ukraine conflict impact	65.7		%	60.8		%	4.9		63.3		%	59.4		%	3.9
Combined ratio, excluding current year catastrophes and Russia-Ukraine conflict impact	96.2		%	90.8		%	5.4		94.4		%	88.8		%	5.6

(1)    Amounts may not reconcile due to rounding.

(2)    The point impact of catastrophes and the Russia-Ukraine conflict is calculated as the associated net losses and loss adjustment expenses divided by total earned premiums.

Premiums

The increase in gross premium volume in our Insurance segment for the quarter and nine months ended September 30, 2023 was driven by more favorable rates and new business growth within our personal lines, property and general liability product lines, partially offset by lower premium volume within our professional liability product lines, where we are adjusting our writings in response to changes in market conditions and downward pressure on rates. We continue to focus on rate adequacy, particularly within certain classes within our casualty and professional liability product lines, and will not write business that does not meet our underwriting profit targets. Within our marine and energy product lines, higher gross premium volume for the nine months ended September 30, 2023 reflects new business and more favorable rates. For the quarter ended September 30, 2023, new business and more favorable rates within our marine and energy product lines were more than offset by the impact of a program that was discontinued and additional premiums received in 2022 related to policies impacted by the Russia-Ukraine conflict.

Net retention of gross premium volume was 81% for the quarter ended September 30, 2023 compared to 80% for the same period of 2022. Net retention of gross premium volume was 80% for the nine months ended September 30, 2023 compared to 82% for the same period of 2022. The decrease in net retention for the nine months ended September 30, 2023 was driven by higher cession rates on our personal lines product lines in 2023 compared to 2022.

The increase in earned premiums for the quarter and nine months ended September 30, 2023 was primarily due to higher gross premium volume across most product lines in recent periods.

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Combined Ratio

The Insurance segment's combined ratio for both the quarter and nine months ended September 30, 2023 was unfavorably impacted by the factors discussed below.

The Insurance segment's combined ratio for the quarter and nine month ended September 30, 2023 included $44.3 million of net losses and loss adjustment expenses attributed to the 2023 Catastrophes. In 2022, the combined ratio included $70.0 million of net losses and loss adjustment expenses attributed to Hurricane Ian for the quarter-to-date and year-to-date periods, as well as $20.0 million of net losses and loss adjustment expenses attributed to the Russia-Ukraine conflict for the year-to-date period.

In the third quarter of 2023, we also recognized losses on our intellectual property collateral protection insurance product written within our professional liability product line, which had a three-point impact on the quarter-to-date combined ratio and one-point impact on the year-to-date combined ratio. These losses reflect higher than anticipated levels of claims and loss experience, as well as the recognition of $25.0 million of credit losses in connection with a $50.0 million fraudulent letter of credit that was provided by an affiliate of Vesttoo Ltd. as collateral for reinsurance purchased on one of the policies that resulted in a claim during the quarter. An affiliate of Vesttoo Ltd. is also the counterparty to a second ceded reinsurance contract on this product line with an aggregate limit of $77.8 million for which the underlying letter of credit was also deemed to be fraudulent. Although a loss has not yet been incurred under this policy, management believes the potential for a covered loss event is reasonably possible. We are actively pursuing remedies to make recoveries on the reinsurance recoverable impacted by the fraudulent letter of credit and to mitigate the potential for additional losses resulting from the second fraudulent letter of credit if a claim is made under the related contract. We do not have any other ceded reinsurance contracts with Vesttoo Ltd. or its affiliates.

With regards to development on prior accident year loss reserves, net favorable development for both the quarter and nine months ended September 30, 2023 was net of $17.5 million and $70.5 million, respectively, of adverse development on prior accident years on our general liability product lines in 2023. This adverse development was primarily attributable to an increased frequency of large claims over the past several quarters on our excess and umbrella and primary casualty contractors' liability product lines, most notably on the 2017 to 2019 accident years. Our professional liability product lines experienced net favorable prior accident year development in 2023 with favorable development on our international business being partially offset by modest adverse development on business with U.S.-based risks, which was impacted by similar factors as our general liability product lines. The impact of economic and social inflation, including the rising cost to adjust and settle claims and the impact of more pervasive litigation financing trends, has resulted in higher than anticipated losses in older accident years for these long-tail general liability and professional liability product lines over the past several quarters. Further, we believe that the ultimate claim reporting tail on this business will be longer than we initially anticipated. Based on these loss development trends on older accident years, we are approaching reductions of prior years loss reserves on our long-tail lines of business with caution, including on more recent accident years where we have had more favorable experience but loss trends have had less time to develop.

Based on the adverse prior accident year loss development trends on these long-tail lines of business and the uncertainty around future loss cost trends, beginning towards the end of 2022, we also have been increasing our current accident year attritional loss ratios on certain product classes within our general liability and professional liability product lines. Consistent with our loss reserving philosophy and to increase the likelihood that the reserves established for our in-force portfolio will ultimately prove to be adequate, we are taking a more cautious approach in our reserving by increasing the level of confidence embedded in our loss selections, resulting in higher attritional loss ratios on this business.

Quarter-to-Date Variance

Excluding losses attributed to natural catastrophes, the increase in the current accident year loss ratio for the quarter ended September 30, 2023 compared to the same period of 2022 was primarily attributable to higher attritional loss ratios within our general liability and professional liability product lines in 2023 compared to 2022, as well as losses recognized on our intellectual property collateral protection insurance product line, as previously discussed.

The Insurance segment's combined ratio for the quarter ended September 30, 2023 included $55.4 million of favorable development on prior accident years loss reserves, which was primarily attributable to favorable development across several product lines in the more recent accident years, partially offset by adverse development on our general liability product lines. For the quarter ended September 30, 2022, the combined ratio included $53.8 million of favorable development on prior accident years loss reserves, which was attributable to favorable development on our workers' compensation, programs and credit and surety product lines.

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Year-to-Date Variance

Excluding losses attributed to natural catastrophes and the Russia-Ukraine conflict, the increase in the current accident year loss ratio for the nine months ended September 30, 2023 compared to the same period of 2022 was primarily attributable to higher attritional loss ratios within our general liability and professional liability product lines in 2023 compared to 2022, as well as losses recognized on our intellectual property collateral protection insurance product line, as previously discussed. We also increased our attritional loss ratios within our professional liability product lines in the first quarter of 2023 related to exposures arising from bank failures.

The Insurance segment's combined ratio for the nine months ended September 30, 2023 included $179.6 million of favorable development on prior accident years loss reserves compared to $196.1 million for the same period of 2022. The decrease in favorable development was primarily due to adverse development on our general liability product lines in 2023 compared to favorable development in 2022, partially offset by favorable development on our professional liability product lines in 2023 compared to modest adverse development in 2022. For the nine months ended September 30, 2023, favorable development was most significant on our international professional liability, property, marine and energy, workers' compensation and personal lines product lines in more recent accident years. The favorable development on prior years loss reserves in 2022 was most significant on our workers' compensation, property, marine and energy and programs product lines.

The modest increase in the Insurance segment's expense ratio for the nine months ended September 30, 2023 compared to the same period of 2022 was primarily due to higher general and administrative expenses, which was partially offset by the favorable impact of higher earned premiums.

Reinsurance Segment

	Quarter Ended September 30,								Nine Months Ended September 30,
(dollars in thousands)	2023			2022			% Change		2023			2022			% Change
Gross premium volume	$	126,037		$	179,455		(30)	%	$	959,198		$	1,044,827		(8)	%
Net written premiums	$	113,430		$	154,029		(26)	%	$	891,017		$	983,087		(9)	%
Earned premiums	$	274,161		$	260,535		5	%	$	799,683		$	808,656		(1)	%
Underwriting profit	$	(5,812)		$	43,255		NM (1)		$	33,606		$	60,377		(44)	%
Underwriting Ratios (2)							Point Change								Point Change
Loss ratio
Current accident year loss ratio	64.2		%	63.9		%	0.3		64.9		%	63.7		%	1.2
Prior accident years loss ratio	8.5		%	(11.3)		%	19.8		0.8		%	(1.7)		%	2.5
Loss ratio	72.7		%	52.6		%	20.1		65.7		%	62.0		%	3.7
Expense ratio	29.4		%	30.8		%	(1.4)		30.1		%	30.6		%	(0.5)
Combined ratio	102.1		%	83.4		%	18.7		95.8		%	92.5		%	3.3
Current accident year loss ratio catastrophe impact (3)	0.7		%	—		%	0.7		0.2		%	—		%	0.2
Current accident year loss ratio Russia-Ukraine conflict impact (3)	—		%	—		%	—		—		%	1.9		%	(1.9)
Current accident year loss ratio, excluding catastrophes and Russia-Ukraine conflict impact	63.5		%	63.9		%	(0.4)		64.7		%	61.8		%	2.9
Combined ratio, excluding current year catastrophes and Russia-Ukraine conflict impact	101.4		%	83.4		%	18.0		95.6		%	90.7		%	4.9

(1)    NM - Ratio is not meaningful.

(2)    Amounts may not reconcile due to rounding.

(3)    The point impact of catastrophes and the Russia-Ukraine conflict is calculated as the associated net losses and loss adjustment expenses divided by total earned premiums.

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Premiums

The decrease in gross premium volume in our Reinsurance segment for the quarter ended September 30, 2023 was primarily attributable to lower gross premiums within our professional liability product lines and the unfavorable timing impact of renewals on multi-year deals within our general liability and marine and energy product lines, partially offset by additional assumed reinstatement premiums recognized in 2023 due to prior accident year development within our property product lines. Lower gross premiums within our professional liability product lines were primarily attributable to unfavorable premium adjustments in 2023 compared to favorable premium adjustments in 2022 on our transaction liability product and decreases on renewals, due to decreased exposures and participation.

The decrease in gross premium volume in our Reinsurance segment for the nine months ended September 30, 2023 was primarily attributable to lower gross premiums within our professional liability product lines, as previously discussed, partially offset by higher gross premiums within our marine and energy product lines. Higher gross premiums within our marine and energy product lines were primarily attributable to increases on renewals, due to increased exposures and more favorable rates, as well as new business.

Significant variability in gross premium volume can be expected in our Reinsurance segment due to individually significant contracts and multi-year contracts.

Net retention of gross premium volume for the quarter ended September 30, 2023 was 90% compared to 86% for the same period of 2022. The increase in net retention for the quarter ended September 30, 2023 was driven by the impact of multi-year deals written in the third quarter of 2022 within our marine and energy product lines which carry a significantly higher cession rate than the rest of the segment. Net retention of gross premium volume for the nine months ended September 30, 2023 was 93% compared to 94% for the same period of 2022. The decrease in net retention for the nine months ended September 30, 2023 was driven by changes in mix of business, as we are writing more marine and energy business, which generally carries a higher cession rate than the rest of the segment, and less of our fully retained professional liability business.

The increase in earned premiums for the quarter ended September 30, 2023 was primarily attributable to higher earnings on multi-year deals within our professional liability product lines, which have experienced growth in recent periods, and additional assumed reinstatement premiums recognized in 2023 due to prior accident year development within our property product lines, as previously discussed. The decrease in earned premiums for the nine months ended September 30, 2023 was primarily due to less favorable premium adjustments in 2023 compared to 2022, primarily attributable to our professional liability product lines, and the non-renewal of a large treaty within our workers' compensation product line. These decreases were largely offset by higher earnings on multi-year deals within our professional liability product lines, as previously discussed.

Combined Ratio: Quarter-to-Date

The Reinsurance segment's current accident year losses and loss adjustment expenses for the quarter ended September 30, 2023 included $1.9 million of net losses and loss adjustment expenses attributed to the Hawaiian wildfires. Excluding these losses attributed to natural catastrophes, the decrease in the Reinsurance segment's current accident year loss ratio for the quarter ended September 30, 2023 compared to the same period of 2022 was primarily attributable to the favorable impact of additional assumed reinstatement premiums recognized in 2023 due to prior accident year development within our property product lines and changes in mix of business during the period. These favorable impacts on the current accident year loss ratio were partially off set by less favorable premium adjustments on prior accident years in 2023 compared to 2022, primarily on our professional liability product lines.

The Reinsurance segment's combined ratio for the quarter ended September 30, 2023 included $23.3 million of adverse development on prior accident years loss reserves, which was driven by $30.0 million, or 11 points, of adverse development in the third quarter of 2023 on a segment of business within our public entity product line that we discontinued writing in 2020. This adverse development was due to an increased frequency of large claims over the past several quarters and was most significant in the 2014 to 2020 accident years. Adverse development in the third quarter of 2023 was also due in part to adverse development on our general liability product lines, as further discussed on a year-to-date basis below, and was net of modest favorable development across several other product lines, including our property product lines. Favorable development on our property product lines was net of adverse development on reserves related to the COVID-19 pandemic within our discontinued retrocessional reinsurance product line, which resulted in additional assumed reinstatement premiums.

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For the quarter ended September 30, 2022, the combined ratio included $29.5 million of favorable development on prior accident years loss reserves, which was attributable to favorable development across several product lines, including favorable development on catastrophe reserves within our property product lines. Favorable development in 2022 was partially offset by the impact of additional exposures recognized on prior accident years related to net favorable premium adjustments on our professional liability, general liability and credit and surety product lines.

The decrease in the Reinsurance segment's expense ratio for the quarter ended September 30, 2023 compared to the same period of 2022 was primarily due to the favorable impact of assumed reinstatement premiums in 2023 on earned premiums.

Combined Ratio: Year-to-Date

The Reinsurance segment's current accident year losses and loss adjustment expenses for the nine months ended September 30, 2023 included $1.9 million of net losses and loss adjustment expenses attributed to the Hawaiian wildfires. Current accident year losses and loss adjustment expenses for the nine months ended September 30, 2022 included $15.0 million of net losses and loss adjustment expenses attributed to the Russia-Ukraine conflict. Excluding these losses, the increase in the current accident year loss ratio for the nine months ended September 30, 2023 compared to the same period of 2022 was primarily due to less favorable premium adjustments on prior accident years in 2023 compared to 2022, primarily on our professional liability and credit and surety product lines, partially offset by the favorable impact of additional assumed reinstatement premiums recognized in 2023 due to prior accident year development within our property product lines.

The Reinsurance segment's combined ratio for the nine months ended September 30, 2023 included a $6.6 million increase in prior accident years loss reserves, which was primarily attributable to adverse development on our public entity product line, as previously discussed, and general liability product lines, as well as additional exposures recognized on prior accident years related to net favorable premium adjustments on our general liability product lines. Adverse development on our general liability product lines was primarily attributable to large reported loss claims and generally adverse loss development trends across multiple accident years. These increases in prior accident year reserves in 2023 were partially offset by favorable development on our professional liability product lines in more recent accident years and on our property product lines, primarily on the 2017 to 2019 accident years.

For the nine months ended September 30, 2022, the combined ratio included a $13.8 million of favorable development on prior accident years loss reserves, which was primarily attributable to favorable development on our credit and surety and property product lines. Favorable development on prior years loss reserves in 2022 was partially offset by additional exposures recognized on prior accident years related to net favorable premium adjustments on our general liability, professional liability and credit and surety product lines.

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Insurance-linked Securities, Program Services and Other Insurance

The following table presents the components of operating revenues and operating expenses attributable to our insurance-linked securities, program services and other insurance operations, including our run-off block of life and annuity reinsurance contracts, none of which are included in a reportable segment. Underwriting results attributable to these operations include results from discontinued lines of business, which are reported separate from our Insurance and Reinsurance segments, and the retained portion of our program services operations. Investment income earned on the investments that support life and annuity policy benefit reserves are included in our Investing segment.

	Quarter Ended September 30,
	2023						2022
(dollars in thousands)	Operating revenues		Operating expenses		Net		Operating revenues		Operating expenses		Net
Services and other:
Program services and other fronting	$	39,749	$	7,939	$	31,810	$	40,820	$	7,256	$	33,564
Insurance-linked securities	43,567		25,598		17,969		25,879		32,899		(7,020)
Life and annuity	—		1,863		(1,863)		118		1,182		(1,064)
Markel CATCo Re	—		(2,231)		2,231		—		(53,363)		53,363
Other	3,291		2,859		432		504		2,203		(1,699)
	86,607		36,028		50,579		67,321		(9,823)		77,144
Underwriting	(683)		(694)		11		1,266		1,813		(547)
	85,924		35,334		50,590		68,587		(8,010)		76,597
Amortization of intangible assets			15,303		(15,303)				15,272		(15,272)
	$	85,924	$	50,637	$	35,287	$	68,587	$	7,262	$	61,325

	Nine Months Ended September 30,
	2023						2022
(dollars in thousands)	Operating revenues		Operating expenses		Net		Operating revenues		Operating expenses		Net
Services and other:
Program services and other fronting	$	106,619	$	22,310	$	84,309	$	104,653	$	21,370	$	83,283
Program services - disposition gain	16,923		—		16,923		—		—		—
Insurance-linked securities	74,148		59,040		15,108		86,089		105,494		(19,405)
Insurance-linked securities - disposition gain	—		—		—		107,293		—		107,293
Life and annuity	48		8,809		(8,761)		724		7,405		(6,681)
Markel CATCo buy-out	—		—		—		—		101,904		(101,904)
Markel CATCo Re	—		(55,696)		55,696		—		(81,562)		81,562
Other	8,835		11,195		(2,360)		9,098		14,978		(5,880)
	206,573		45,658		160,915		307,857		169,589		138,268
Underwriting	(1,468)		4,729		(6,197)		(1,130)		8,589		(9,719)
	205,105		50,387		154,718		306,727		178,178		128,549
Amortization of intangible assets			45,878		(45,878)				45,939		(45,939)
	$	205,105	$	96,265	$	108,840	$	306,727	$	224,117	$	82,610

Program Services and Other Fronting

Operating revenues in our program services and other fronting operations for both the quarter and the nine months ended September 30, 2023 were consistent with the respective periods of 2022.

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The following table summarizes gross premium volume in our program services and other fronting operations.

	Quarter Ended September 30,						Nine Months Ended September 30,
(dollars in thousands)	2023		2022		% Change		2023		2022		% Change
Program services	$	684,296	$	711,714	(4)	%	$	2,187,015	$	2,127,077	3	%
Other fronting	$	488,453	$	279,585	75	%	$	817,097	$	494,058	65	%

For the quarter ended September 30, 2023, the decrease in gross premium volume within our program services operations was driven by certain program terminations, partially offset by expansion of existing programs and growth from new programs. For the nine months ended September 30, 2023, the increase in gross premium volume within our program services operations was attributable to expansion of existing programs and growth from new programs. The increase in gross premium volume in our other fronting operations for the quarter and nine months ended September 30, 2023 was driven by expansion of our property catastrophe programs with Nephila Reinsurers and achieving more favorable rates on this business, as well as growth from a new specialty program with Nephila Reinsurers.

In June 2023, we sold Independent Specialty Insurance Company (ISIC), a subsidiary within our program services operations, to Velocity Holdco, LLC (Velocity). ISIC is a licensed insurance carrier, the value of which is attributed to its insurance licenses. Through its managing general agent operations, Velocity has an existing program with our program services operations, through which it places business on behalf of our Nephila ILS operations. Following the sale, Velocity intends to use ISIC to start writing a portion of the business it places directly. The sale resulted in a gain of $16.9 million during the second quarter of 2023.

Insurance-Linked Securities

For the quarter ended September 30, 2023, the increase in operating revenues in our Nephila ILS operations was primarily due to $29.5 million of management fees recognized in the third quarter of 2023 upon the release of capital from side pocket reserves. For the nine months ended September 30, 2023, the decrease in operating revenues and expenses was primarily due to the disposition of our Velocity managing general agent operations in February 2022 and Volante managing general agent operations in October 2022. The sale of the majority of our controlling interest in our Velocity managing general agent operations resulted in a gain of $107.3 million during the first quarter of 2022. Our Nephila ILS operations in 2023 are solely comprised of our fund management operations. As of September 30, 2023, Nephila's net assets under management were $6.8 billion.

Markel CATCo

In March 2022, we completed a buy-out transaction with Markel CATCo Re and the Markel CATCo Funds that provided for an accelerated return of all remaining capital to investors in the Markel CATCo Funds and resulted in the consolidation of Markel CATCo Re upon completion of the transaction. In order to complete the transaction, we made $101.9 million in payments, net of insurance proceeds, to or for the benefit of investors that were recognized as an expense during the first quarter of 2022. For the quarter and nine months ended September 30, 2023 and 2022, results attributable to Markel CATCo Re were primarily related to favorable loss reserve development on the run-off of reinsurance contracts, all of which were attributable to noncontrolling interest holders in Markel CATCo Re. See note 11 of the notes to consolidated financial statements for further details regarding our Markel CATCo operations, the buy-out transaction and the consolidation of Markel CATCo Re.

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Investing Results

We measure our investment performance by analyzing net investment income earned on our investment portfolio, which reflects the recurring interest and dividend earnings on our investment portfolio. We also analyze net investment gains, which include unrealized gains and losses on our equity portfolio, and the change in net unrealized gains on available-for-sale investments. Based on the potential for volatility in the financial markets, we understand that the level of gains or losses may vary from one period to the next, and therefore believe that our investment performance is best analyzed over longer periods of time. Other income or losses within our investing operations primarily relate to equity method investments in our investing segment, which are managed separately from the rest of our investment portfolio.

The following table summarizes our consolidated investment performance, which consists predominantly of our Investing segment.

	Quarter Ended September 30,						Nine Months Ended September 30,
(dollars in thousands)	2023			2022			2023			2022
Net investment income	$	192,207		$	112,614		$	521,235		$	301,713
Yield on fixed maturity securities (1)	2.9		%	2.3		%	2.7		%	2.3		%
Yield on short-term investments (1)	5.0		%	1.8		%	4.4		%	0.9		%
Yield on cash and cash equivalents and restricted cash and cash equivalents (1)	3.0		%	0.6		%	2.6		%	0.3		%
Net realized investment gains (losses)	$	(36,093)		$	2,032		$	(38,159)		$	6,001
Change in fair value of equity securities	(229,824)			(283,515)			629,332			(2,200,526)
Net investment gains (losses)	$	(265,917)		$	(281,483)		$	591,173		$	(2,194,525)
Return on equity securities (2)	(2.2)		%	(3.5)		%	9.3		%	(23.4)		%
Other	$	(5,033)		$	(4,883)		$	(13,791)		$	(27,590)
Change in net unrealized gains (losses) on available-for-sale investments	$	(208,405)		$	(538,347)		$	(170,606)		$	(1,656,623)

(1)    Yields reflect the applicable annualized interest income as a percentage of the applicable monthly average invested assets at amortized cost.

(2)    Return on equity securities is calculated by dividing dividends and the change in fair value of equity securities by the monthly average equity securities at fair value and considers the timing of net purchases and sales.

For the quarter and nine months ended September 30, 2023, net investment income increased 71% and 73%, respectively, primarily attributable to higher interest income on short-term investments and cash equivalents due to higher short-term interest rates in 2023 compared to 2022. During 2023, we have been increasing our allocation of cash to money market funds in response to increases in short-term interest rates. Additionally, interest income on our fixed maturity securities increased due to a higher yield and higher average holdings of fixed maturity securities during the quarter and nine months ended September 30, 2023 compared to the same periods of 2022. During 2023, we have continued to increase our allocation of cash and short-term investments to fixed maturity securities in response to increasing interest rates and to support our growing underwriting business. See note 3(d) of the notes to consolidated financial statements for details regarding the components of net investment income.

Net investment losses for the quarter ended September 30, 2023 were primarily attributable to a decrease in the fair value of our equity portfolio driven by unfavorable market value movements. Net investment gains for the nine months ended September 30, 2023 were primarily attributable to an increase in the fair value of our equity portfolio driven by favorable market value movements. Net investment losses for both the quarter and the nine months ended September 30, 2022 were primarily attributable to a decrease in the fair value of our equity portfolio driven by unfavorable market value movements. As of September 30, 2023, the fair value of our equity portfolio included cumulative unrealized gains of $5.2 billion.

The change in net unrealized gains (losses) on available-for-sale investments for both the quarter and nine months ended September 30, 2023 and 2022 was primarily attributable to decreases in the fair value of our fixed maturity investment portfolio as a result of increases in interest rates during 2023 and 2022. As of September 30, 2023, 99% of our fixed maturity portfolio was rated "AA" or better.

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Markel Ventures Results

We measure Markel Ventures' results by its operating income and net income, as well as earnings before interest, income taxes, depreciation and amortization (EBITDA). We consolidate the results of our Markel Ventures subsidiaries on a one-month lag, with the exception of significant transactions or events that occur during the intervening period. The following table summarizes the operating revenues, operating income, EBITDA and net income to shareholders from our Markel Ventures segment.

	Quarter Ended September 30,						Nine Months Ended September 30,
(dollars in thousands)	2023		2022		% Change		2023		2022		% Change
Operating revenues	$	1,246,769	$	1,216,063	3	%	$	3,738,028	$	3,527,853	6	%
Operating income	$	107,302	$	60,459	77	%	$	330,120	$	217,242	52	%
EBITDA	$	157,277	$	102,764	53	%	$	474,287	$	352,623	35	%
Net income to shareholders	$	65,396	$	36,358	80	%	$	198,623	$	130,341	52	%

The increases in operating revenues for the quarter and nine months ended September 30, 2023 compared to the same periods of 2022 were driven by higher revenues at our construction services businesses and transportation-related businesses, due to a combination of increased demand, higher prices, and growth, as well as increased production at one of our equipment manufacturing businesses. For the nine months ended September 30, 2023, the increase in operating revenues also reflected a full nine-month contribution from Metromont in 2023, compared to a partial contribution in 2022 following its acquisition. For both the quarter and nine months ended September 30, 2023, these increases were partially offset by the impact of decreased demand at certain of our consumer and building products businesses, our consulting services businesses and one of our construction services businesses.

The increases in operating income, EBITDA and net income to shareholders for the quarter and nine months ended September 30, 2023 compared to the same periods of 2022 were driven by our products businesses, particularly our consumer and building products businesses, which had higher margins in 2023 compared to 2022. In 2022, the operating margins at many of these businesses were impacted by increased costs of materials, freight and labor, which reflected the impact of broader economic conditions. As conditions stabilized in 2023, particularly in regards to materials and freight costs, our operating margins improved. The increases in operating income, EBITDA and net income to shareholders for the quarter and nine months ended September 30, 2023 at many of our businesses were partially offset by the impact of lower revenues and operating margins at one of our construction services businesses due to decreased demand.

Markel Ventures EBITDA is a non-GAAP financial measure. We use Markel Ventures EBITDA as an operating performance measure in conjunction with U.S. GAAP measures, including operating revenues, operating income and net income to shareholders, to monitor and evaluate the performance of our Markel Ventures segment. Because EBITDA excludes interest, income taxes, depreciation and amortization, it provides an indicator of economic performance that is useful to both management and investors in evaluating our Markel Ventures businesses as it is not affected by levels of debt, interest rates, effective tax rates or levels of depreciation or amortization resulting from purchase accounting. The following table reconciles Markel Ventures operating income to Markel Ventures EBITDA.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Markel Ventures operating income	$	107,302	$	60,459	$	330,120	$	217,242
Depreciation expense	26,857		23,738		81,639		75,304
Amortization of intangible assets	23,118		18,567		62,528		60,077
Markel Ventures EBITDA	$	157,277	$	102,764	$	474,287	$	352,623

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Interest Expense, Net Foreign Exchange Gains (Losses) and Income Taxes

Interest Expense

Interest expense was $44.6 million and $141.2 million for the quarter and nine months ended September 30, 2023, respectively, compared to $47.3 million and $147.1 million for the same periods of 2022. The decrease in interest expense for the quarter and nine months ended September 30, 2023 was attributable to the impact of the retirement of our 3.625% unsecured senior notes in March 2023. For the nine months ended September 30, 2023, the decrease in interest expense was also attributable to the impact of the retirement of our 4.9% unsecured senior notes in July 2022. See note 10 of the notes to consolidated financial statements for further details regarding the retirement of our senior long-term debt.

Net Foreign Exchange Gains (Losses)

Net foreign exchange gains (losses) included in net income were gains of $39.2 million and losses of $8.7 million for the quarter and nine months ended September 30, 2023, respectively, compared to net foreign exchange gains of $113.6 million and $241.7 million for the same periods of 2022. Net foreign exchange gains (losses) are primarily due to the remeasurement of our foreign currency denominated insurance reserves to the U.S. Dollar. The U.S. Dollar remained relatively stable against the Euro and British Pound, the predominant foreign currencies within our insurance operations, during 2023, while it strengthened against the Euro and British Pound during the quarter and nine months ended September 30, 2022. Pre-tax net foreign exchange gains and losses attributed to changes in exchange rates on available-for-sale securities supporting our insurance reserves, which are included in the changes in net unrealized gains (losses) on available-for-sale investments in other comprehensive income (losses), were losses of $27.3 million and gains of $7.9 million for the quarter and nine months ended September 30, 2023, respectively, compared to losses of $91.1 million and $199.3 million for the same periods of 2022.

Income Taxes

The effective tax rate was 21% and 23% for the nine months ended September 30, 2023 and 2022, respectively. We use the estimated annual effective tax rate method for calculating our tax provision in interim periods. This method applies our best estimate of the effective tax rate expected for the full year to year-to-date earnings before income taxes. Certain items, including those deemed to be unusual, infrequent or that cannot be reliably estimated (discrete items), are excluded from the estimated annual effective tax rate, and the related tax expense or benefit is reported in the same period as the related item. The estimated annual effective tax rate was 22% and 21% for the nine months ended September 30, 2023 and 2022, respectively.

Comprehensive Income (Loss) to Shareholders and Book Value per Common Share

The following table summarizes the components of comprehensive income (loss) to shareholders.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Net income (loss) to shareholders	$	42,591	$	59,594	$	1,226,754	$	(907,943)
Other comprehensive loss:
Change in net unrealized gains (losses) on available-for-sale investments, net of taxes	(164,461)		(424,338)		(134,847)		(1,306,232)
Change in discount rate for life and annuity benefits, net of taxes	14,609		25,244		8,781		149,135
Other, net of taxes	(167)		(8,569)		2,809		(12,587)
Other comprehensive (income) loss attributable to noncontrolling interest	(72)		110		(83)		66
Other comprehensive loss to shareholders	(150,091)		(407,553)		(123,340)		(1,169,618)
Comprehensive income (loss) to shareholders	$	(107,500)	$	(347,959)	$	1,103,414	$	(2,077,561)

Book value per common share was $1,013.25 as of September 30, 2023 compared to $935.65 at December 31, 2022.

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Financial Condition

Liquidity and Capital Resources

We seek to maintain prudent levels of liquidity and financial leverage for the protection of our policyholders, creditors and shareholders. Our consolidated debt to capital ratio was 21% at September 30, 2023 and 24% at December 31, 2022. The decrease reflects a decrease in senior long-term debt, primarily attributable to the retirement of our 3.625% unsecured senior notes due March 30, 2023, as well as an increase in shareholders' equity.

Investments, cash and cash equivalents and restricted cash and cash equivalents (invested assets) were $28.8 billion and $27.4 billion at September 30, 2023 and December 31, 2022, respectively. The following table presents the composition of our invested assets.

	September 30, 2023		December 31, 2022
Fixed maturity securities	45	%	43	%
Equity securities	30	%	28	%
Short-term investments, cash and cash equivalents and restricted cash and cash equivalents	25	%	29	%
Total	100	%	100	%

Our holding company had $3.3 billion and $3.7 billion of invested assets at September 30, 2023 and December 31, 2022, respectively. The decrease was driven by repurchases of common stock and the retirement of our 3.625% unsecured senior notes due March 30, 2023. The following table presents the composition of our holding company's invested assets.

	September 30, 2023		December 31, 2022
Fixed maturity securities	4	%	4	%
Equity securities	49	%	40	%
Short-term investments, cash and cash equivalents and restricted cash and cash equivalents	47	%	56	%
Total	100	%	100	%

We have a share repurchase program, authorized by our Board of Directors, that provides for the repurchase of up to $750 million of common stock. As of September 30, 2023, $245.6 million remained available for repurchases under the program. This share repurchase program has no expiration date but may be terminated by the Board of Directors at any time.

We may from time to time seek to prepay, retire or repurchase our outstanding senior notes or preferred shares, through open market purchases, privately negotiated transactions or otherwise. Those prepayments, retirements or repurchases, if any, will depend on prevailing market conditions, our liquidity requirements, contractual restrictions and other factors.

In June 2023, we entered into an amended and restated credit agreement for our corporate revolving credit facility, which provides up to $300 million of capacity for future acquisitions, investments and stock repurchases, and for other working capital and general corporate purposes. At our discretion, up to $200 million of the total capacity may be used for letters of credit. We may increase the capacity of the facility by up to $200 million subject to obtaining commitments for the increase and certain other terms and conditions. This facility expires in June 2028. The credit agreement for this revolving credit facility amended and restated the credit agreement for our previous $300 million revolving credit facility. At September 30, 2023 and December 31, 2022, there were no borrowings outstanding under either revolving credit facility. As of September 30, 2023, we were in compliance with all covenants contained in our corporate revolving credit facility. To the extent that we are not in compliance with our covenants, access to the revolving credit facility could be restricted. While we believe this to be unlikely, the inability to access the revolving credit facility could adversely affect our liquidity.

We have access to various capital sources, including dividends from certain of our subsidiaries, holding company invested assets, undrawn capacity under our revolving credit facility and access to the debt and equity capital markets. We believe we have adequate liquidity to meet our capital and operating needs, including that which may be required to support the operating needs of our subsidiaries. However, the availability of these sources of capital and the availability and terms of future financings will depend on a variety of factors.

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Various of our Markel Ventures subsidiaries maintain revolving credit facilities or lines of credit, which provide up to $715 million of aggregate capacity for working capital and other general operational purposes. A portion of the capacity on certain of these credit facilities may be used as security for letters of credit and other obligations. At September 30, 2023 and December 31, 2022, we had $171.3 million and $238.1 million, respectively, of borrowings outstanding under these credit facilities. As of September 30, 2023, all of our subsidiaries were in compliance with all covenants contained in their respective credit facilities. To the extent our subsidiaries are not in compliance with their respective covenants, access to their credit facilities could be restricted, which could adversely affect their operations.

Cash Flows

Net cash provided by operating activities was $2.0 billion for the nine months ended September 30, 2023 compared to $1.9 billion for the same period of 2022. The increase in net cash flows from operating activities for the nine months ended September 30, 2023 was primarily due to an increase in operating cash flows from Markel Ventures, partially offset by a $125.1 million payment made to complete a retroactive reinsurance transaction to cede our portfolio of policies comprised of liabilities related to our run-off book of U.K. motor casualty business.

Net cash used by investing activities was $1.3 billion for both the nine months ended September 30, 2023 and 2022. During the nine months ended September 30, 2023, net cash used by investing activities included net purchases of fixed maturity securities and equity securities of $1.3 billion and $268.7 million, respectively, and a net decrease in short-term investments of $487.8 million. During the nine months ended September 30, 2022, net cash used by investing activities included net purchases of fixed maturity securities, short-term investments and equity securities of $875.6 million, $625.3 million and $128.7 million, respectively. Net cash used by investing activities for the nine months ended September 30, 2022 was net of $630.0 million of net cash and restricted cash acquired as part of our consolidation of Markel CATCo Re, of which $169.4 million was subsequently distributed to Markel CATCo investors for shares that were redeemed in conjunction with the buy-out transaction. Cash flows from investing activities is affected by various factors such as anticipated payment of claims, financing activity, acquisition opportunities and individual buy and sell decisions made in the normal course of our investment portfolio management.

Net cash used by financing activities was $799.3 million for the nine months ended September 30, 2023 compared to $491.1 million for the same period of 2022. During the nine months ended September 30, 2023, net cash used by financing activities included $250.0 million to retire our 3.625% unsecured senior notes due March 30, 2023 and net repayments of debt at our Markel Ventures businesses, primarily on revolving lines of credit at certain of these businesses. During the nine months ended September 30, 2022, net cash used by financing activities included $350.0 million to retire our 4.90% unsecured senior notes due July 1, 2022. During the nine months ended September 30, 2022, we had net increases in borrowings at our Markel Ventures businesses, primarily on revolving lines of credit at certain of these businesses. Cash of $269.6 million and $208.1 million was used to repurchase shares of our common stock during the first nine months of 2023 and 2022, respectively.

Critical Accounting Estimates

Critical accounting estimates are those estimates that both are important to the portrayal of our financial condition and results of operations and require us to exercise significant judgment. The preparation of financial statements in accordance with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of material contingent assets and liabilities. These estimates, by necessity, are based on assumptions about numerous factors.

Our critical accounting estimates consist of estimates and assumptions used in determining the reserves for unpaid losses and loss adjustment expenses as well as estimates and assumptions used in the valuation of goodwill and intangible assets. We review the adequacy of reserves for unpaid losses and loss adjustment expenses quarterly. Estimates and assumptions for goodwill and intangible assets are reviewed in conjunction with acquisitions and impairment assessments. Goodwill and indefinite-lived intangible assets are reassessed for impairment at least annually. All intangible assets, including goodwill, are also reviewed for impairment when events or circumstances indicate that their carrying value may not be recoverable. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

Readers are urged to review our 2022 Annual Report on Form 10-K for a more complete description of our critical accounting estimates.

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Safe Harbor and Cautionary Statement

This report contains statements concerning or incorporating our expectations, assumptions, plans, objectives, future financial or operating performance and other statements that are not historical facts. These statements are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements may use words such as "anticipate," "believe," "estimate," "expect," "intend," "predict," "project" and similar expressions as they relate to us or our management.

There are risks and uncertainties that may cause actual results to differ materially from predicted results in forward-looking statements. Factors that may cause actual results to differ are often presented with the forward-looking statements themselves. Additional factors that could cause actual results to differ from those predicted are set forth under "Business," "Risk Factors," "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Quantitative and Qualitative Disclosures About Market Risk" in our 2022 Annual Report on Form 10-K, or are included in the items listed below:

•the effect of cyclical trends or changes in market conditions on our underwriting, investing, Markel Ventures and other operations, including demand and pricing in the insurance, reinsurance and other markets in which we operate;

•actions by competitors, including the use of technology and innovation to simplify the customer experience, increase efficiencies, redesign products, alter models and effect other potentially disruptive changes in the insurance industry, and the effect of competition on market trends and pricing;

•our efforts to develop new products, expand in targeted markets or improve business processes and workflows may not be successful and may increase or create new risks (e.g., insufficient demand, change to risk exposures, distribution channel conflicts, execution risk, increased expenditures);

•the frequency and severity of man-made and natural catastrophes (including earthquakes, wildfires and weather-related catastrophes) may exceed expectations, are unpredictable and, in the case of wildfires and weather-related catastrophes, may be exacerbated if, as many forecast, changing conditions in the climate, oceans and atmosphere result in increased hurricane, flood, drought or other adverse weather-related activity;

•we offer insurance and reinsurance coverage against terrorist acts, such as the recent attacks in Israel, in connection with some of our programs, and in other instances we are legally required to offer terrorism insurance; in both circumstances, we actively manage our exposure, but if there is a covered terrorist attack, we could sustain material losses;

•emerging claim and coverage issues, changing industry practices and evolving legal, judicial, social and other claims and coverage trends or conditions, can increase the scope of coverage, the frequency and severity of claims and the period over which claims may be reported; these factors, as well as uncertainties in the loss estimation process, can adversely impact the adequacy of our loss reserves and our allowance for reinsurance recoverables;

•reinsurance reserves are subject to greater uncertainty than insurance reserves, primarily because of reliance upon the original underwriting decisions made by ceding companies and the longer lapse of time from the occurrence of loss events to their reporting to the reinsurer for ultimate resolution;

•inaccuracies (whether due to data error, human error or otherwise) in the various modeling techniques and data analytics (e.g., scenarios, predictive and stochastic modeling, and forecasting) we use to analyze and estimate exposures, loss trends and other risks associated with our insurance and insurance-linked securities businesses could cause us to misprice our products or fail to appropriately estimate the risks to which we are exposed;

•changes in the assumptions and estimates used in establishing reserves for our life and annuity reinsurance book (which is in runoff), for example, changes in assumptions and estimates of mortality, longevity, morbidity and interest rates, could result in material changes in our estimated loss reserves for that business;

•adverse developments in insurance coverage litigation or other legal or administrative proceedings could result in material increases in our estimates of loss reserves;

•initial estimates for catastrophe losses and other significant, infrequent events (such as the COVID-19 pandemic and the Russia-Ukraine conflict), are often based on limited information, are dependent on broad assumptions about the nature and extent of losses, coverage, liability and reinsurance, and those losses may ultimately differ materially from our expectations;

•changes in the availability, costs, quality and providers of reinsurance coverage, which may impact our ability to write or continue to write certain lines of business or to mitigate the volatility of losses on our results of operations and financial condition;

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•the ability or willingness of reinsurers to pay balances due may be adversely affected by industry and economic conditions, deterioration in reinsurer credit quality and coverage disputes, and collateral we hold, if any, may not be sufficient to cover a reinsurer's obligation to us;

•after the commutation of ceded reinsurance contracts, any subsequent adverse development in the re-assumed loss reserves will result in a charge to earnings;

•regulatory actions can impede our ability to charge adequate rates and efficiently allocate capital;

•general economic and market conditions and industry specific conditions, including extended economic recessions or expansions; prolonged periods of slow economic growth; inflation or deflation; fluctuations in foreign currency exchange rates, commodity and energy prices and interest rates; volatility in the credit and capital markets; and other factors;

•economic conditions, actual or potential defaults in corporate bonds, municipal bonds, mortgage-backed securities or sovereign debt obligations, volatility in interest and foreign currency exchange rates and changes in market value of concentrated investments can have a significant impact on the fair value of our fixed maturity securities and equity securities, as well as the carrying value of our other assets and liabilities, and this impact may be heightened by market volatility and our ability to mitigate our sensitivity to these changing conditions;

•economic conditions may adversely affect our access to capital and credit markets;

•the effects of government intervention, including material changes in the monetary policies of central banks, to address financial downturns, inflation and other economic and currency concerns;

•the impacts that political and civil unrest and regional conflicts, such as the conflicts between Russia and Ukraine and between Israel and Hamas, may have on our businesses and the markets they serve or that any disruptions in regional or worldwide economic conditions generally arising from these situations may have on our businesses, industries or investments;

•the significant volatility, uncertainty and disruption caused by health epidemics and pandemics, including the COVID-19 pandemic and its variants, as well as governmental, legislative, judicial or regulatory actions or developments in response thereto;

•changes in U.S. tax laws, regulations or interpretations, or in the tax laws, regulations or interpretations of other jurisdictions in which we operate, and adjustments we may make in our operations or tax strategies in response to those changes;

•a failure or security breach of, or cyberattack on, enterprise information technology systems that we use or a failure to comply with data protection or privacy regulations;

•third-party providers may perform poorly, breach their obligations to us or expose us to enhanced risks;

•our acquisitions may increase our operational and internal control risks for a period of time;

•we may not realize the contemplated benefits, including cost savings and synergies, of our acquisitions;

•any determination requiring the write-off of a significant portion of our goodwill and intangible assets;

•the failure or inadequacy of any methods we employ to manage our loss exposures;

•the loss of services of any senior executive or other key personnel of our businesses could adversely impact one or more of our operations;

•the manner in which we manage our global operations through a network of business entities could result in inconsistent management, governance and oversight practices and make it difficult for us to implement strategic decisions and coordinate procedures;

•our substantial international operations and investments expose us to increased political, civil, operational and economic risks, including foreign currency exchange rate and credit risk;

•our ability to obtain additional capital for our operations on terms favorable to us;

•our compliance, or failure to comply, with covenants and other requirements under our credit facilities, senior debt and other indebtedness and our preferred shares;

•our ability to maintain or raise third-party capital for existing or new investment vehicles and risks related to our management of third-party capital;

•the effectiveness of our procedures for compliance with existing and future guidelines, policies and legal and regulatory standards, rules, laws and regulations;

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•the impact of economic and trade sanctions and embargo programs on our businesses, including instances in which the requirements and limitations applicable to the global operations of U.S. companies and their affiliates are more restrictive than, or conflict with, those applicable to non-U.S. companies and their affiliates;

•regulatory changes, or challenges by regulators, regarding the use of certain issuing carrier or fronting arrangements;

•our dependence on a limited number of brokers for a large portion of our revenues and third-party capital;

•adverse changes in our assigned financial strength, debt or preferred share ratings or outlook could adversely impact us, including our ability to attract and retain business, the amount of capital our insurance subsidiaries must hold and the availability and cost of capital;

•changes in the amount of statutory capital our insurance subsidiaries are required to hold, which can vary significantly and is based on many factors, some of which are outside our control;

•losses from litigation and regulatory investigations and actions;

•investor litigation or disputes, as well as regulatory inquiries, investigations or proceedings related to our Markel CATCo operations; delays or disruptions in the run-off of those operations; or the failure to realize the benefits of the transaction that permitted the accelerated return of capital to our Markel CATCo investors; and

•a number of additional factors may adversely affect our Markel Ventures operations, and the markets they serve, and negatively impact their revenues and profitability, including, among others: adverse weather conditions, plant disease and other contaminants; changes in government support for education, healthcare and infrastructure projects; changes in capital spending levels; changes in the housing, commercial and industrial construction markets; liability for environmental matters; supply chain and shipping issues, including increases in freight costs; volatility in the market prices for their products; and volatility in commodity, wholesale and raw materials prices and interest and foreign currency exchange rates.

Results from our underwriting, investing, Markel Ventures and other operations have been and will continue to be potentially materially affected by these factors.

By making forward-looking statements, we do not intend to become obligated to publicly update or revise any such statements whether as a result of new information, future events or other changes. Readers are cautioned not to place undue reliance on any forward-looking statements, which are based on our current knowledge and speak only as at their dates.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Market risk is the risk of economic losses due to adverse changes in the estimated fair value of a financial instrument as the result of changes in equity prices, interest rates, foreign currency exchange rates and commodity prices. Our consolidated balance sheets include assets and liabilities with estimated fair values that are subject to market risk. Our primary market risks are equity price risk associated with investments in equity securities, interest rate risk associated with investments in fixed maturity securities and foreign currency exchange rate risk associated with our international operations. During the nine months ended September 30, 2023, there were no material changes in our market risk exposures from those described in our 2022 Annual Report on Form 10-K.

Credit Risk

Credit risk, which is not considered a market risk, is the risk that an entity becomes unable or unwilling to fulfill their obligations to us. Our primary credit risks are the credit risk within our fixed maturity portfolio and the credit risk related to our reinsurance recoverables within our underwriting, program services and other fronting operations. In the third quarter of 2023, we discovered that two letters of credit provided as collateral for ceded reinsurance contracts within our underwriting operations were fraudulent. See "Results of Operations - Insurance Results" under Part I: Item 2 for further discussion. During the nine months ended September 30, 2023, there were no other material changes in our credit risk exposures from those described in our 2022 Annual Report on Form 10-K.

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Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this quarterly report, we evaluated the effectiveness of the design and operation of our disclosure controls and procedures (Disclosure Controls), as defined under Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934 (Exchange Act). This evaluation was conducted under the supervision and with the participation of our management, including the Principal Executive Officer (PEO) and the Principal Financial Officer (PFO).

Based upon this evaluation, the PEO and PFO concluded that effective Disclosure Controls were in place to ensure that the information required to be disclosed in reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during the third quarter of 2023 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

Thomas Yeransian v. Markel Corporation

We previously reported that Thomas Yeransian, in his capacity as the representative of holders of certain contingent value rights, has filed three suits against the Company:

•Thomas Yeransian v. Markel Corporation (U.S. District Court for the District of Delaware), filed September 15, 2016;

•Thomas Yeransian v. Markel Corporation (U.S. District Court for the District of Delaware), filed November 13, 2018; and

•Thomas Yeransian v. Markel Corporation (U.S. District Court for the District of Delaware), filed June 5, 2020.

The three suits have been consolidated. On June 8, 2023, the court ruled in favor of the Company and against Mr. Yeransian on all counts. Mr. Yeransian has appealed the court's decision. For additional information regarding these three suits, see Item 3 Legal Proceedings in our 2022 Annual Report on Form 10-K. We believe Mr. Yeransian's suits to be without merit. We further believe that any material loss resulting from the suits to be remote.

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

The following table summarizes our common share repurchases for the quarter ended September 30, 2023.

Issuer Purchases of Equity Securities
	(a)	(b)		(c)	(d)
Period	Total Number of Shares Purchased	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 (in thousands)
July 1, 2023 through July 31, 2023	23,025	$	1,401.39	23,025	$	291,499
August 1, 2023 through August 31, 2023	16,551	$	1,482.07	16,551	$	266,970
September 1, 2023 through September 30, 2023	14,200	$	1,507.38	14,200	$	245,565
Total	53,776	$	1,454.21	53,776	$	245,565

(1)    The Board of Directors approved the repurchase of up to $750 million of our common shares pursuant to a share repurchase program publicly announced in February 2022. Under our share repurchase program, we may repurchase outstanding common shares of our stock from time to time in privately negotiated or open market transactions, including under plans complying with Rule 10b5-1 and Rule 10b-18 under the Exchange Act. The share repurchase program has no expiration date but may be terminated by the Board at any time.

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Item 5. Other Information

Adoption or Termination of Trading Arrangements by Directors or Officers

During the Company's quarterly period ended September 30, 2023, no director or officer (as defined in Exchange Act Rule 16a-1(f)) of the Company adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement" as defined in Regulation S-K Item 408.

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Item 6. Exhibits

Exhibit No.	Document Description
3.1(a)	Amended and Restated Articles of Incorporation (incorporated by reference from Exhibit 3.1 in the Registrant's report on Form 8-K filed with the Commission May 13, 2011)
3.1(b)	Articles of Amendment to the Amended and Restated Articles of Incorporation (incorporated by reference from Exhibit 3.1 in the Registrant's report on Form 8-K filed with the Commission May 27, 2020)
3.1(c)	Articles of Amendment to the Amended and Restated Articles of Incorporation (incorporated by reference from Exhibit 3.1 in the Registrant's report on Form 8-K filed with the Commission May 16, 2023)
3.2	Bylaws, as amended and restated May 26, 2023 (incorporated by reference from Exhibit 3.2 in the Registrant's report on Form 10-Q filed with the Commission August 2, 2023)
4.1(a)	Indenture dated as of June 5, 2001, between Markel Corporation and The Chase Manhattan Bank, as Trustee (incorporated by reference from Exhibit 4.1 in the Registrant's report on Form 8-K filed with the Commission June 5, 2001)
4.1(b)	Form of Third Supplemental Indenture dated as of August 13, 2004 between Markel Corporation and JPMorgan Chase Bank (formerly known as The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission August 11, 2004)
4.1(c)	Form of Ninth Supplemental Indenture dated as of March 8, 2013 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.3 in the Registrant's report on Form 8-K filed with the Commission March 7, 2013)
4.1(d)	Form of Tenth Supplemental Indenture dated as of April 5, 2016 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission March 31, 2016)
4.1(e)	Eleventh Supplemental Indenture dated as of November 2, 2017 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission November 2, 2017)
4.1(f)	Twelfth Supplemental Indenture dated as of November 2, 2017 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.3 in the Registrant's report on Form 8-K filed with the Commission November 2, 2017)
4.1(g)	Thirteenth Supplemental Indenture, dated as of May 20, 2019, between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission May 20, 2019)
4.1(h)	Fourteenth Supplemental Indenture, dated as of September 17, 2019, between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission September 17, 2019)
4.1(i)	Fifteenth Supplemental Indenture, dated as of September 17, 2019, between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.3 in the Registrant's report on Form 8-K filed with the Commission September 17, 2019)
4.1(j)	Sixteenth Supplemental Indenture, dated as of May 7, 2021, between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission May 7, 2021)
The registrant hereby agrees to furnish to the Securities and Exchange Commission, upon request, a copy of all other instruments defining the rights of holders of long-term debt of the registrant and its subsidiaries.
10.1	Amended and Restated Credit Agreement, dated as of June 23, 2023, among Markel Group Inc., Markel Bermuda Limited, Markel Global Reinsurance Company, the lenders from time to time party thereto, and Wells Fargo Bank, National Association, as the administrative agent (incorporated by reference from Exhibit 10.1 in the Registrant's report on Form 8-K filed with the Commission June 23, 2023)

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10.2	Form of Amended and Restated Executive Employment Agreement with Robert C. Cox, Andrew G. Crowley, Thomas S. Gayner, Teresa S. Gendron, Richard R. Grinnan, Michael R. Heaton, and Jeremy A. Noble (incorporated by reference from Exhibit 10.2 in the Registrant's report on Form 10-Q filed with the Commission on August 2, 2023)*
31.1	Certification of Principal Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a)**
31.2	Certification of Principal Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a)**
32.1	Certification furnished Pursuant to 18 U.S.C. Section 1350**
101	The following consolidated financial statements from Markel Group's Quarterly Report on Form 10-Q for the quarter ended September 30, 2023, filed on November 1, 2023, formatted in Inline XBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income (Loss) and Comprehensive Income (Loss), (iii) Consolidated Statements of Changes in Equity, (iv) Condensed Consolidated Statements of Cash Flows and (v) Notes to Consolidated Financial Statements.**
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

* Indicates management contract or compensatory plan or arrangement

** Filed with this report

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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, this 1st day of November 2023.

Markel Group Inc.
By:	/s/ Thomas S. Gayner
	Thomas S. Gayner
	Chief Executive Officer
	(Principal Executive Officer)
By:	/s/ Teresa S. Gendron
	Teresa S. Gendron
	Chief Financial Officer
	(Principal Financial Officer)

58

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO RULE 13a-14(a)/15d-14(a)

I, Thomas S. Gayner, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Markel Group Inc.;

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(s) 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 (the registrant's fourth fiscal quarter in the case of an annual report) 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(s) 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.

November 1, 2023	/s/ Thomas S. Gayner
	Thomas S. Gayner
	Chief Executive Officer
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

PURSUANT TO RULE 13a-14(a)/15d-14(a)

I, Teresa S. Gendron, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Markel Group Inc.;

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(s) 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 (the registrant's fourth fiscal quarter in the case of an annual report) 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(s) 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.

November 1, 2023	/s/ Teresa S. Gendron
	Teresa S. Gendron
	Chief Financial Officer
	(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION

FURNISHED PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Quarterly Report of Markel Group Inc. (the "Company") on Form 10-Q for the period ended September 30, 2023 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), each of the undersigned certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his or her 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.

November 1, 2023	/s/ Thomas S. Gayner
	Thomas S. Gayner
	Chief Executive Officer
	(Principal Executive Officer)
	/s/ Teresa S. Gendron
	Teresa S. Gendron
	Chief Financial Officer
	(Principal Financial Officer)

XML

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Oct. 25, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-15811
Entity Registrant Name	MARKEL GROUP INC.
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	54-1959284
Entity Address, Address Line One	4521 Highwoods Parkway
Entity Address, City or Town	Glen Allen
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	23060-6148
City Area Code	804
Local Phone Number	747-0136
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	MKL
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		13,218,534
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001096343
Current Fiscal Year End Date	--12-31

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets [Abstract]
Fixed maturity securities, available-for-sale (amortized cost of $14,067,742 in 2023 and $12,805,887 in 2022)	$ 12,951,279	$ 11,856,835
Equity securities (cost of $3,401,511 in 2023 and $3,100,040 in 2022)	8,574,957	7,671,912
Short-term investments, available-for-sale (estimated fair value approximates cost)	2,252,726	2,669,262
Total Investments	23,778,962	22,198,009
Cash and cash equivalents	4,354,858	4,137,432
Restricted cash and cash equivalents	690,004	1,084,081
Receivables	3,557,500	2,961,056
Reinsurance recoverables	8,534,919	8,446,745
Deferred policy acquisition costs	985,947	925,483
Prepaid reinsurance premiums	2,707,925	2,066,114
Goodwill	2,623,451	2,638,838
Intangible assets	1,633,188	1,747,464
Other assets	3,881,962	3,586,037
Total Assets	52,748,716	49,791,259
Liabilities and Equity [Abstract]
Unpaid losses and loss adjustment expenses	22,144,366	20,947,898
Life and annuity benefits	600,256	650,721
Unearned premiums	7,196,808	6,220,748
Payables to insurance and reinsurance companies	924,602	669,742
Senior long-term debt and other debt (estimated fair value of $3,060,000 in 2023 and $3,541,000 in 2022)	3,769,248	4,103,629
Other liabilities	3,590,807	3,461,482
Total Liabilities	38,226,087	36,054,220
Redeemable noncontrolling interests	467,386	523,154
Commitments and contingencies
Shareholders' equity:
Preferred Stock	591,891	591,891
Common stock	3,519,534	3,493,893
Retained earnings	10,778,567	9,832,804
Accumulated other comprehensive loss	(890,833)	(767,494)
Total Shareholders' Equity	13,999,159	13,151,094
Noncontrolling interests	56,084	62,791
Total Equity	14,055,243	13,213,885
Total Liabilities and Equity	$ 52,748,716	$ 49,791,259

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Fixed maturities, available-for-sale, amortized cost	$ 14,067,742	$ 12,805,887
Equity securities, cost	3,401,511	3,100,040
Senior long-term debt and other debt, fair value	$ 3,060,000	$ 3,541,000

XML

Consolidated Statements Of Income (Loss) And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
OPERATING REVENUES
Earned premiums	$ 2,121,745		$ 1,956,830		$ 6,120,592		$ 5,549,704
Net investment income	192,207		112,614		521,235		301,713
Net investment gains (losses)	(265,917)		(281,483)		591,173		(2,194,525)
Products revenues	601,524		586,531		1,964,332		1,845,111
Services and other revenues	725,627		691,653		1,963,779		1,962,585
Total Operating Revenues	3,375,186		3,066,145		11,161,111		7,464,588
OPERATING EXPENSES
Losses and loss adjustment expenses	1,404,325		1,185,313		3,765,215		3,216,495
Underwriting, acquisition and insurance expenses	698,129		643,272		2,071,721		1,843,106
Products expenses	545,567		580,830		1,712,792		1,726,367
Services and other expenses	606,810		546,384		1,678,246		1,693,756
Amortization of intangible assets	47,545	[1]	43,418	[2]	136,367	[3]	134,990	[4]
Total Operating Expenses	3,302,376		2,999,217		9,364,341		8,614,714
Operating Income (Loss)	72,810		66,928		1,796,770		(1,150,126)
Interest expense	(44,553)		(47,348)		(141,212)		(147,090)
Net foreign exchange gains (losses)	39,246		113,635		(8,658)		241,706
Income (Loss) Before Income Taxes	67,503		133,215		1,646,900		(1,055,510)
Income tax (expense) benefit	(14,235)		(16,460)		(339,903)		240,629
Net Income (Loss)	53,268		116,755		1,306,997		(814,881)
Net income attributable to noncontrolling interests	(10,677)		(57,161)		(80,243)		(93,062)
Net Income (Loss) to Shareholders	42,591		59,594		1,226,754		(907,943)
Preferred stock dividends	0		0		(18,000)		(18,000)
Net Income (Loss) to Common Shareholders	42,591		59,594		1,208,754		(925,943)
OTHER COMPREHENSIVE LOSS
Net holding losses arising during the period	(187,330)		(424,929)		(161,115)		(1,308,521)
Reclassification adjustments for net losses included in net income (loss)	22,869		591		26,268		2,289
Change in net unrealized gains (losses) on available-for-sale investments, net of taxes	(164,461)		(424,338)		(134,847)		(1,306,232)
Change in discount rate for life and annuity benefits, net of taxes	14,609		25,244		8,781		149,135
Change in foreign currency translation adjustments, net of taxes	(187)		(8,872)		2,753		(14,395)
Change in net actuarial pension loss, net of taxes	20		303		56		1,808
Total Other Comprehensive Loss	(150,019)		(407,663)		(123,257)		(1,169,684)
Comprehensive Income (Loss)	(96,751)		(290,908)		1,183,740		(1,984,565)
Comprehensive income attributable to noncontrolling interests	(10,749)		(57,051)		(80,326)		(92,996)
Comprehensive Income (Loss) to Shareholders	$ (107,500)		$ (347,959)		$ 1,103,414		$ (2,077,561)
NET INCOME (LOSS) PER COMMON SHARE
Basic	$ 3.15		$ 3.09		$ 90.86		$ (72.61)
Diluted	$ 3.14		$ 3.08	[5]	$ 90.69		$ (72.61)	[5]

[1] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.1 million for the quarter ended September 30, 2023

[2] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.6 million for the quarter ended September 30, 2022

[3] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $28.0 million for the nine months ended September 30, 2023.

[4] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $29.0 million for the nine months ended September 30, 2022.

[5] The impact of 28 thousand shares from restricted stock units and restricted stock was excluded from the computation of diluted net loss per common share for the nine months ended September 30, 2022 because the effect would have been anti-dilutive.

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Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Total Equity [Member]	Total Shareholders' Equity [Member]	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]	Redeemable Noncontrolling Interests [Member]	Velocity [Member] Total Equity [Member]	Velocity [Member] Noncontrolling Interests [Member]	Metromont LLC [Member] Redeemable Noncontrolling Interests [Member]
Balance at Dec. 31, 2021		$ 14,722,732	$ 14,699,872	$ 591,891	$ 3,441,079	$ 10,444,895	$ 222,007	$ 22,860
Balance, redeemable noncontrolling interests at Dec. 31, 2021									$ 461,378
Net Income (Loss)	$ (814,881)	(829,660)	(907,943)			(907,943)	0	78,283	14,779
Other comprehensive income (loss)	(1,169,684)	(1,169,618)	(1,169,618)			0	(1,169,618)	0	(66)
Comprehensive Income (Loss)	(1,984,565)	(1,999,278)	(2,077,561)					78,283	14,713
Repurchase of common stock		(208,090)	(208,090)	0	0	(208,090)	0	0	0
Preferred stock dividends	18,000	(18,000)	(18,000)	0	0	(18,000)	0	0	0
Restricted stock awards expensed		37,531	37,531	0	37,531	0	0	0	0
Adjustment of redeemable noncontrolling interests		(62,168)	(62,168)	0	0	(62,168)	0	0	62,168
Acquisitions		0	0	0	0	0	0	0				$ (18,681)
Dispositions			0	0	0	0	0		0	$ (22,059)	$ (22,059)
Redemption of Markel CATCo Re noncontrolling interests	0	(22,261)	0	0	0	0	0	(22,261)	0
Other		13,176	5,203	0	4,218	985	0	7,973	(6,535)
Balance at Sep. 30, 2022		12,441,583	12,376,787	591,891	3,482,828	9,249,679	(947,611)	64,796
Balance, redeemable noncontrolling interests at Sep. 30, 2022									513,043
Balance at Jun. 30, 2022		12,830,727	12,819,602	591,891	3,478,153	9,289,616	(540,058)	11,125
Balance, redeemable noncontrolling interests at Jun. 30, 2022									495,378
Net Income (Loss)	116,755	112,461	59,594			59,594	0	52,867	4,294
Other comprehensive income (loss)	(407,663)	(407,553)	(407,553)			0	(407,553)	0	(110)
Comprehensive Income (Loss)	(290,908)	(295,092)	(347,959)					52,867	4,184
Repurchase of common stock		(81,799)	(81,799)	0	0	(81,799)	0	0	0
Restricted stock awards expensed		4,661	4,661	0	4,661	0	0	0	0
Adjustment of redeemable noncontrolling interests		(17,730)	(17,730)	0	0	(17,730)	0	0	17,730
Other		816	12	0	14	(2)	0	804	(4,249)
Balance at Sep. 30, 2022		12,441,583	12,376,787	591,891	3,482,828	9,249,679	(947,611)	64,796
Balance, redeemable noncontrolling interests at Sep. 30, 2022									513,043
Balance at Dec. 31, 2022	13,213,885	13,213,885	13,151,094	591,891	3,493,893	9,832,804	(767,494)	62,791
Balance, redeemable noncontrolling interests at Dec. 31, 2022	523,154								523,154
Net Income (Loss)	1,306,997	1,282,694	1,226,754			1,226,754	0	55,940	24,303
Other comprehensive income (loss)	(123,257)	(123,340)	(123,340)			0	(123,340)	0	83
Comprehensive Income (Loss)	1,183,740	1,159,354	1,103,414					55,940	24,386
Repurchase of common stock		(269,593)	(269,593)	0	0	(269,593)	0	0	0
Preferred stock dividends	18,000	(18,000)	(18,000)	0	0	(18,000)	0	0	0
Restricted stock awards expensed		31,477	31,477	0	31,477	0	0	0	0
Adjustment of redeemable noncontrolling interests		7,087	7,087	0	0	7,087	0	0	(7,087)
Purchase of noncontrolling interest		(5,464)	(5,464)	0	(5,464)	0	0	0	(48,907)
Redemption of Markel CATCo Re noncontrolling interests	(88,997)	(62,646)	0	0	0	0	0	(62,646)	0
Other		(857)	(856)	0	(372)	(485)	1	(1)	(24,160)
Balance at Sep. 30, 2023	14,055,243	14,055,243	13,999,159	591,891	3,519,534	10,778,567	(890,833)	56,084
Balance, redeemable noncontrolling interests at Sep. 30, 2023	467,386								467,386
Balance at Jun. 30, 2023		14,239,081	14,185,499	591,891	3,515,362	10,818,989	(740,743)	53,582
Balance, redeemable noncontrolling interests at Jun. 30, 2023									464,442
Net Income (Loss)	53,268	45,093	42,591			42,591	0	2,502	8,175
Other comprehensive income (loss)	(150,019)	(150,091)	(150,091)			0	(150,091)	0	72
Comprehensive Income (Loss)	(96,751)	(104,998)	(107,500)					2,502	8,247
Repurchase of common stock		(82,432)	(82,432)	0	0	(82,432)	0	0	0
Restricted stock awards expensed		4,949	4,949	0	4,949	0	0	0	0
Adjustment of redeemable noncontrolling interests		(628)	(628)	0	0	(628)	0	0	628
Purchase of noncontrolling interest		(776)	(776)	0	(776)	0	0	0	570
Other		47	47	0	(1)	47	1	0	(6,501)
Balance at Sep. 30, 2023	14,055,243	$ 14,055,243	$ 13,999,159	$ 591,891	$ 3,519,534	$ 10,778,567	$ (890,833)	$ 56,084
Balance, redeemable noncontrolling interests at Sep. 30, 2023	$ 467,386								$ 467,386

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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
OPERATING ACTIVITIES
Net income (loss)	$ 1,306,997	$ (814,881)
Adjustments to reconcile net income (loss) to net cash provided by operating activities	657,280	2,695,153
Net Cash Provided By Operating Activities	1,964,277	1,880,272
INVESTING ACTIVITIES
Proceeds from sales, maturities, calls and prepayments of fixed maturity securities	1,359,948	557,742
Cost of fixed maturity securities purchased	(2,661,587)	(1,433,299)
Proceeds from sales of equity securities	179,665	164,277
Cost of equity securities purchased	(448,388)	(293,011)
Net change in short-term investments	487,839	(625,261)
Cost of equity method and other investments purchased	(159,591)	(18,782)
Additions to property and equipment	(155,088)	(209,282)
Consolidation of Markel CATCo Re, net	0	629,955
Distributions to Markel CATCo Re noncontrolling interests for buy-out transaction	0	(169,380)
Proceeds from sales of subsidiaries, net	41,302	109,505
Other	13,267	4,211
Net Cash Used By Investing Activities	(1,342,633)	(1,283,325)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	475,964	757,941
Repayment of senior long-term debt and other debt	(811,857)	(982,852)
Repurchases of common stock	(269,593)	(208,090)
Dividends paid on preferred stock	(18,000)	(18,000)
Redemption of Markel CATCo Re noncontrolling interests	(88,997)	0
Purchase of noncontrolling interests	(54,371)	(30)
Other	(32,434)	(40,023)
Net Cash Used By Financing Activities	(799,288)	(491,054)
Effect of foreign currency rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents	993	(190,972)
Increase in cash, cash equivalents, restricted cash and restricted cash equivalents	(176,651)	(85,079)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	5,221,513	4,880,947
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD	$ 5,044,862	$ 4,795,868

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Summary Of Significant Accounting Policies

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

Summary of Significant Accounting Policies

Markel Group Inc., formerly Markel Corporation, is a holding company comprised of a diverse group of companies and investments with specialty insurance at its core. Effective May 26, 2023, Markel Corporation changed its name to Markel Group Inc. (Markel Group). Through its wholly owned subsidiary, Markel Ventures, Inc. (Markel Ventures), Markel Group owns controlling interests in businesses that operate in a variety of industries. See note 2 for details regarding reportable segments.

a) Basis of Presentation. The consolidated balance sheet as of September 30, 2023 and the related consolidated statements of income (loss) and comprehensive income (loss) and changes in equity for the quarters and nine months ended September 30, 2023 and 2022, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2023 and 2022 are unaudited. In the opinion of management, all adjustments necessary for fair presentation of such consolidated financial statements have been included. Except for the adjustments described in note 1 c), such adjustments consist only of normal, recurring items. Interim results are not necessarily indicative of results of operations for the entire year. The consolidated balance sheet as of December 31, 2022 was derived from Markel Group's audited annual consolidated financial statements.

The accompanying consolidated financial statements have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) and include the accounts of Markel Group and its consolidated subsidiaries, as well as variable interest entities (VIEs) that meet the requirements for consolidation (the Company). All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates the results of its Markel Ventures subsidiaries on a one-month lag, with the exception of significant transactions or events that occur during the intervening period. Certain prior period amounts have been reclassified to conform to the current period presentation.

The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

The consolidated financial statements and notes are presented as permitted by Form 10-Q and do not contain certain information included in the Company's annual consolidated financial statements and notes. The following accounting policy was updated to reflect an accounting standard that became effective January 1, 2023. See note 1 c). For a more complete description of the Company's business and accounting policies, readers are urged to review the Company's 2022 Annual Report on Form 10-K.

b) Life and Annuity Benefits. The Company has a run-off block of life and annuity reinsurance contracts that subject the Company to mortality, longevity and morbidity risks. Effective January 1, 2023, the Company adopted Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2018-12, Financial Services—Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts and restated all prior periods presented to reflect the new accounting standard. The primary component of the Company's liabilities for life and annuity benefits is the present value of the liability for future policyholder benefits. The cash flow assumptions used to determine the policyholder benefit reserves are reviewed, and updated as necessary, at least annually. Interest accretion for the reserves is calculated using the discount rate locked-in at contract inception. Policy benefit reserves are remeasured each period using current discount rates, based on yields for upper-medium grade fixed maturity securities, with the impact of changes in the discount rate included in other comprehensive income, net of taxes. All other results attributable to the run-off of life and annuity reinsurance contracts are included in services and other revenues and services and other expenses in the consolidated statements of income and comprehensive income. Investment income earned on the investments that support the policy benefit reserves are included in net investment income. Because of the uncertainty in the assumptions used to estimate reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimated liability. See note 9 for further details regarding life and annuity benefits.

c) Recent Accounting Pronouncements

Accounting Standards Adopted

Effective January 1, 2023, the Company adopted ASU No. 2018-12 and several ASUs issued as amendments to ASU No. 2018-12. This standard requires insurance companies with long duration contracts to: (1) review and, if there is a change, update the assumptions used to measure expected cash flows at least annually; (2) update the discount rate assumption at each reporting date; and (3) enhance certain qualitative and quantitative disclosures. ASU No. 2018-12 was applied using a modified retrospective approach that required restatement of prior periods presented, including a cumulative adjustment recorded to accumulated other comprehensive income as of January 1, 2021 (the transition date) as a result of updating the discount rate assumption. At the transition date, the adoption of ASU 2018-12 had no impact on retained earnings but resulted in a decrease to accumulated other comprehensive income, net of taxes, of $15.3 million, which was comprised of the following corresponding adjustments to life and annuity benefits and deferred tax liabilities.

(dollars in thousands)	January 1, 2021
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities	$	119,548
Apply updated discount rate to the liability for future policyholder benefits	(138,865)
Increase in life and annuity benefits	(19,317)
Decrease in deferred tax liability	4,057
Decrease in accumulated other comprehensive income, net of taxes	$	(15,260)

The impact of changes in the discount rate on the liability for future policyholder benefits following the transition date are included in other comprehensive income (loss) in the respective periods and, combined with the transition adjustment, resulted in the following cumulative changes to the Company's previously presented consolidated balance sheets.

	December 31,
(dollars in thousands)	2022		2021
Decrease (increase) in life and annuity benefits	$	113,396	$	(19,759)
Decrease (increase) in deferred tax liability	(23,813)		4,149
Increase (decrease) in accumulated other comprehensive income (loss), net of taxes	$	89,583	$	(15,610)

Changes in the discount rate on the liability for future policyholder benefits also resulted in an increase, or benefit, of $25.2 million and $104.5 million to the other comprehensive loss previously presented for the quarter and nine months ended September 30, 2022, which was comprised of the following adjustments.

(dollars in thousands)	Quarter Ended September 30, 2022		Nine Months Ended September 30, 2022
Reverse benefit included in change in net unrealized gains (losses) on available-for-sale-investments, net of taxes, related to reversal of previously recognized reserve deficiency adjustment	$	—	$	(44,682)
Change in discount rate for life and annuity benefits, net of taxes	25,244		149,135
Increase in other comprehensive loss, net of taxes	$	25,244	$	104,453

The adoption of other provisions of this ASU did not have a material impact on the Company's financial position, results of operations or cash flows for any of the periods presented.

Effective January 1, 2023, the Company adopted ASU No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. ASU No. 2021-08 requires contract assets and liabilities accounted for under FASB Accounting Standards Codification (ASC) 606, Revenue from Contracts with Customers, to be recorded at the acquisition date as if the acquirer entered into those contracts itself on the contract inception dates, rather than at fair value. At adoption, ASU No. 2021-08 did not impact the Company's financial position, results of operations or cash flows, but prospectively, this ASU will impact amounts recorded by the Company for assets acquired and liabilities assumed in conjunction with certain acquisitions.

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Segment Reporting Disclosures

9 Months Ended

Sep. 30, 2023

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

Segment Reporting Disclosures

Segment Reporting Disclosures

The chief operating decision maker reviews the Company's ongoing underwriting operations on a global basis in the following two segments: Insurance and Reinsurance. In determining how to allocate resources and assess the performance of the Company's underwriting results, management considers many factors, including the nature of the insurance product sold, the type of account written and the type of customer served. The Insurance segment includes all direct business and facultative placements written on a risk-bearing basis within the Company's underwriting operations. The Reinsurance segment includes all treaty reinsurance written on a risk-bearing basis within the Company's underwriting operations. All investing activities related to the Company's insurance operations are included in the Investing segment.

The Company's other insurance operations primarily consist of the results of the Company's insurance-linked securities operations and program services business. Other insurance operations also include results for lines of business discontinued prior to, or in conjunction with, acquisitions, including development on asbestos and environmental loss reserves and results attributable to the run-off of life and annuity reinsurance business, which are monitored separately from the Company's ongoing underwriting operations. For purposes of segment reporting, none of these other insurance operations are considered to be reportable segments.

The Company's chief operating decision maker reviews and assesses Markel Ventures' performance in the aggregate, as a single operating segment. The Markel Ventures segment primarily consists of controlling interests in a diverse portfolio of businesses that operate in various industries.

Segment profit for each of the Company's underwriting segments is measured by underwriting profit. The property and casualty insurance industry commonly defines underwriting profit as earned premiums net of losses and loss adjustment expenses and underwriting, acquisition and insurance expenses. Underwriting profit does not replace operating income or net income computed in accordance with U.S. GAAP as a measure of profitability. Underwriting profit or loss provides a basis for management to evaluate the Company's underwriting performance. Segment profit for the Company's underwriting segments may also include other revenues and expenses that are attributable to the Company's underwriting operations that are not captured in underwriting profit. Segment profit for the Investing segment is measured by income from the Company's investment portfolio, which is comprised of net investment income and net investment gains. Segment profit for the Investing segment also includes income from equity method investments, which is included within services and other revenues. Segment profit for the Markel Ventures segment is measured by operating income.

For management reporting purposes, the Company allocates assets to its underwriting operations and to its Investing and Markel Ventures segments and certain of its other operations, including its insurance-linked securities and program services operations. Underwriting assets include assets attributed to the Company's Insurance and Reinsurance segments, discontinued underwriting lines of business, as well as assets that are not specifically allocated to the Company's other operations. Generally, the Company manages its underwriting assets in the aggregate and therefore does not allocate assets to individual underwriting segments.

a) The following tables summarize the Company's segment disclosures.

	Quarter Ended September 30, 2023
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	1,848,267	$	274,161	$	—	$	—	$	(683)	$	2,121,745
Net investment income	—		—		191,015		1,192		—		192,207
Net investment losses	—		—		(265,917)		—		—		(265,917)
Products revenues	—		—		—		601,524		—		601,524
Services and other revenues	—		—		(5,033)		644,053		86,607		725,627
Total operating revenues	1,848,267		274,161		(79,935)		1,246,769		85,924		3,375,186
Losses and loss adjustment expenses:
Current accident year	(1,258,864)		(176,007)		—		—		—		(1,434,871)
Prior accident years	55,374		(23,262)		—		—		(1,566)		30,546
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(369,001)		(68,919)		—		—		—		(437,920)
Other underwriting expenses	(250,684)		(11,785)		—		—		2,260		(260,209)
Products expenses	—		—		—		(545,567)		—		(545,567)
Services and other expenses	—		—		—		(570,782)		(36,028)		(606,810)
Amortization of intangible assets (2)	—		—		—		(23,118)		(24,427)		(47,545)
Segment profit (loss)	$	25,092	$	(5,812)	$	(79,935)	$	107,302	$	26,163	$	72,810
Interest expense											(44,553)
Net foreign exchange gains											39,246
Income before income taxes											$	67,503

(1)    Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)    Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.1 million for the quarter ended September 30, 2023.

	Quarter Ended September 30, 2022
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	1,695,029	$	260,535	$	—	$	—	$	1,266	$	1,956,830
Net investment income	—		—		112,297		317		—		112,614
Net investment losses	—		—		(281,483)		—		—		(281,483)
Products revenues	—		—		—		586,531		—		586,531
Services and other revenues	—		—		(4,883)		629,215		67,321		691,653
Total operating revenues	1,695,029		260,535		(174,069)		1,216,063		68,587		3,066,145
Losses and loss adjustment expenses:
Current accident year	(1,100,511)		(166,485)		—		—		—		(1,266,996)
Prior accident years	53,760		29,505		—		—		(1,582)		81,683
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(362,137)		(68,662)		—		—		(383)		(431,182)
Other underwriting expenses	(200,604)		(11,638)		—		—		152		(212,090)
Products expenses	—		—		—		(580,830)		—		(580,830)
Services and other expenses	—		—		—		(556,207)		9,823		(546,384)
Amortization of intangible assets (2)	—		—		—		(18,567)		(24,851)		(43,418)
Segment profit (loss)	$	85,537	$	43,255	$	(174,069)	$	60,459	$	51,746	$	66,928
Interest expense											(47,348)
Net foreign exchange gains											113,635
Income before income taxes											$	133,215

(1)     Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)     Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.6 million for the quarter ended September 30, 2022.

	Nine Months Ended September 30, 2023
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	5,322,377	$	799,683	$	—	$	—	$	(1,468)	$	6,120,592
Net investment income	—		—		518,536		2,699		—		521,235
Net investment gains	—		—		591,173		—		—		591,173
Products revenues	—		—		—		1,964,332		—		1,964,332
Services and other revenues	—		—		(13,791)		1,770,997		206,573		1,963,779
Total operating revenues	5,322,377		799,683		1,095,918		3,738,028		205,105		11,161,111
Losses and loss adjustment expenses:
Current accident year	(3,415,860)		(519,109)		—		—		—		(3,934,969)
Prior accident years	179,564		(6,584)		—		—		(3,226)		169,754
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(1,096,500)		(202,271)		—		—		—		(1,298,771)
Other underwriting expenses	(733,334)		(38,113)		—		—		(1,503)		(772,950)
Products expenses	—		—		—		(1,712,792)		—		(1,712,792)
Services and other expenses	—		—		—		(1,632,588)		(45,658)		(1,678,246)
Amortization of intangible assets (2)	—		—		—		(62,528)		(73,839)		(136,367)
Segment profit	$	256,247	$	33,606	$	1,095,918	$	330,120	$	80,879	$	1,796,770
Interest expense											(141,212)
Net foreign exchange losses											(8,658)
Income before income taxes											$	1,646,900

(1)    Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)    Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $28.0 million for the nine months ended September 30, 2023.

	Nine Months Ended September 30, 2022
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	4,742,178	$	808,656	$	—	$	—	$	(1,130)	$	5,549,704
Net investment income	—		—		301,289		424		—		301,713
Net investment losses	—		—		(2,194,525)		—		—		(2,194,525)
Products revenues	—		—		—		1,845,111		—		1,845,111
Services and other revenues	—		—		(27,590)		1,682,318		307,857		1,962,585
Total operating revenues	4,742,178		808,656		(1,920,826)		3,527,853		306,727		7,464,588
Losses and loss adjustment expenses:
Current accident year	(2,906,031)		(514,875)		—		—		—		(3,420,906)
Prior accident years	196,093		13,845		—		—		(5,527)		204,411
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(996,369)		(209,541)		—		—		(415)		(1,206,325)
Other underwriting expenses	(596,426)		(37,708)		—		—		(2,647)		(636,781)
Products expenses	—		—		—		(1,726,367)		—		(1,726,367)
Services and other expenses	—		—		—		(1,524,167)		(169,589)		(1,693,756)
Amortization of intangible assets (2)	—		—		—		(60,077)		(74,913)		(134,990)
Segment profit (loss)	$	439,445	$	60,377	$	(1,920,826)	$	217,242	$	53,636	$	(1,150,126)
Interest expense											(147,090)
Net foreign exchange gains											241,706
Loss before income taxes											$	(1,055,510)

(1)     Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)     Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $29.0 million for the nine months ended September 30, 2022.

b) The following amounts attributable to the Markel Ventures segment are also reviewed, or included in measures reviewed, by the Company's chief operating decision maker.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Depreciation expense	$	26,857	$	23,738	$	81,639	$	75,304
Interest expense (1)	$	10,663	$	11,921	$	36,485	$	34,124
Income tax expense	$	22,253	$	12,603	$	66,022	$	43,682
Capital expenditures	$	65,616	$	48,294	$	135,159	$	144,974

(1)    Interest expense for the quarter and nine months ended September 30, 2023 included intercompany interest expense of $6.6 million and $19.9 million, respectively. Interest expense for the quarter and nine months ended September 30, 2022 included intercompany interest expense of $6.6 million and $20.7 million, respectively. Intercompany interest expense was eliminated in consolidation.

c) The following table reconciles segment assets to the Company's consolidated balance sheets.

(dollars in thousands)	September 30, 2023		December 31, 2022
Segment assets:
Investing	$	28,522,052	$	26,982,280
Underwriting	9,884,553		8,853,559
Markel Ventures	5,444,105		5,315,677
Total segment assets	43,850,710		41,151,516
Other operations	8,898,006		8,639,743
Total assets	$	52,748,716	$	49,791,259

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Investments

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

a) The following tables summarize the Company's available-for-sale investments. Commercial and residential mortgage-backed securities include securities issued by U.S. government-sponsored enterprises and U.S. government agencies. The net unrealized holding gains (losses) in the tables below are presented before taxes.

	September 30, 2023
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Fixed maturity securities:
U.S. Treasury securities	$	3,440,991	$	—	$	(130,162)	$	3,310,829
U.S. government-sponsored enterprises	1,133,417		—		(137,733)		995,684
Obligations of states, municipalities and political subdivisions	4,106,251		879		(308,184)		3,798,946
Foreign governments	1,749,621		2,626		(189,128)		1,563,119
Commercial mortgage-backed securities	2,297,828		11		(208,466)		2,089,373
Residential mortgage-backed securities	511,525		1		(32,686)		478,840
Asset-backed securities	1,226		—		(28)		1,198
Corporate bonds	826,883		758		(114,351)		713,290
Total fixed maturity securities	14,067,742		4,275		(1,120,738)		12,951,279
Short-term investments	2,250,219		3,253		(746)		2,252,726
Investments, available-for-sale	$	16,317,961	$	7,528	$	(1,121,484)	$	15,204,005

	December 31, 2022
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Fixed maturity securities:
U.S. Treasury securities	$	3,050,089	$	2,363	$	(138,493)	$	2,913,959
U.S. government-sponsored enterprises	871,463		154		(106,079)		765,538
Obligations of states, municipalities and political subdivisions	3,973,911		6,503		(247,231)		3,733,183
Foreign governments	1,473,658		2,843		(169,723)		1,306,778
Commercial mortgage-backed securities	2,109,721		395		(169,668)		1,940,448
Residential mortgage-backed securities	553,591		6		(26,804)		526,793
Asset-backed securities	1,693		—		(53)		1,640
Corporate bonds	771,761		836		(104,101)		668,496
Total fixed maturity securities	12,805,887		13,100		(962,152)		11,856,835
Short-term investments	2,663,560		5,760		(58)		2,669,262
Investments, available-for-sale	$	15,469,447	$	18,860	$	(962,210)	$	14,526,097

b) The following tables summarize gross unrealized investment losses on available-for-sale investments by the length of time that securities have continuously been in an unrealized loss position.

	September 30, 2023
	Less than 12 months				12 months or longer				Total
(dollars in thousands)	Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses
Fixed maturity securities:
U.S. Treasury securities	$	1,339,577	$	(33,496)	$	1,971,252	$	(96,666)	$	3,310,829	$	(130,162)
U.S. government-sponsored enterprises	302,362		(13,784)		693,322		(123,949)		995,684		(137,733)
Obligations of states, municipalities and political subdivisions	1,469,105		(36,622)		2,240,788		(271,562)		3,709,893		(308,184)
Foreign governments	442,453		(18,214)		1,095,516		(170,914)		1,537,969		(189,128)
Commercial mortgage-backed securities	321,255		(13,554)		1,764,367		(194,912)		2,085,622		(208,466)
Residential mortgage-backed securities	45,081		(1,074)		433,695		(31,612)		478,776		(32,686)
Asset-backed securities	—		—		1,198		(28)		1,198		(28)
Corporate bonds	98,459		(2,890)		605,598		(111,461)		704,057		(114,351)
Total fixed maturity securities	4,018,292		(119,634)		8,805,736		(1,001,104)		12,824,028		(1,120,738)
Short-term investments	203,710		(746)		—		—		203,710		(746)
Total	$	4,222,002	$	(120,380)	$	8,805,736	$	(1,001,104)	$	13,027,738	$	(1,121,484)

At September 30, 2023, the Company held 1,732 available-for-sale securities in an unrealized loss position with a total estimated fair value of $13.0 billion and gross unrealized losses of $1.1 billion. Of these 1,732 securities, 1,150 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $8.8 billion and gross unrealized losses of $1.0 billion.

	December 31, 2022
	Less than 12 months				12 months or longer				Total
(dollars in thousands)	Estimated Fair Value		Gross Unrealized Holding  Losses		Estimated Fair Value		Gross Unrealized Holding  Losses		Estimated Fair Value		Gross Unrealized Holding  Losses
Fixed maturity securities:
U.S. Treasury securities	$	735,605	$	(30,583)	$	1,907,922	$	(107,910)	$	2,643,527	$	(138,493)
U.S. government-sponsored enterprises	413,495		(40,488)		331,391		(65,591)		744,886		(106,079)
Obligations of states, municipalities and political subdivisions	2,474,289		(164,537)		348,943		(82,694)		2,823,232		(247,231)
Foreign governments	900,322		(115,324)		300,423		(54,399)		1,200,745		(169,723)
Commercial mortgage-backed securities	1,611,603		(117,482)		305,217		(52,186)		1,916,820		(169,668)
Residential mortgage-backed securities	516,423		(25,232)		9,342		(1,572)		525,765		(26,804)
Asset-backed securities	1,640		(53)		—		—		1,640		(53)
Corporate bonds	496,766		(74,542)		153,035		(29,559)		649,801		(104,101)
Total fixed maturity securities	7,150,143		(568,241)		3,356,273		(393,911)		10,506,416		(962,152)
Short-term investments	774,480		(58)		—		—		774,480		(58)
Total	$	7,924,623	$	(568,299)	$	3,356,273	$	(393,911)	$	11,280,896	$	(962,210)

At December 31, 2022, the Company held 1,400 available-for-sale securities in an unrealized loss position with a total estimated fair value of $11.3 billion and gross unrealized losses of $962.2 million. Of these 1,400 securities, 246 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $3.4 billion and gross unrealized losses of $393.9 million.

The Company completes a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is the result of a credit loss. All available-for-sale securities with unrealized losses are reviewed. The Company considers many factors in completing its quarterly review of securities with unrealized losses for credit-related impairment to determine whether a credit loss exists, including the extent to which fair value is below cost, the implied yield to maturity, rating downgrades of the security and whether or not the issuer has failed to make scheduled principal or interest payments. The Company also takes into consideration information about the financial condition of the issuer and industry factors that could negatively impact the issuer.

If the decline in fair value of an available-for-sale security below its amortized cost is considered to be the result of a credit loss, the Company compares the estimated present value of the cash flows expected to be collected to the amortized cost of the security. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the credit loss, which is recorded as an allowance and recognized in net income. The allowance is limited to the difference between the fair value and the amortized cost of the security. Any remaining decline in fair value represents the non-credit portion of the impairment, which is recognized in other comprehensive income. The Company did not have an allowance for credit losses as of September 30, 2023 or December 31, 2022.

Quarterly, the Company also considers whether it intends to sell an available-for-sale security or if it is more likely than not that it will be required to sell a security before recovery of its amortized cost. In these instances, a decline in fair value is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security.

c) The amortized cost and estimated fair value of fixed maturity securities at September 30, 2023 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,245,195	$	1,221,058
Due after one year through five years	4,731,573		4,490,492
Due after five years through ten years	3,655,839		3,269,429
Due after ten years	1,624,556		1,400,889
	11,257,163		10,381,868
Commercial mortgage-backed securities	2,297,828		2,089,373
Residential mortgage-backed securities	511,525		478,840
Asset-backed securities	1,226		1,198
Total fixed maturity securities	$	14,067,742	$	12,951,279

d) The following table presents the components of net investment income.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Interest:
Fixed maturity securities	$	98,891	$	72,477	$	269,438	$	215,541
Short-term investments	26,768		10,316		77,099		14,644
Cash and cash equivalents and restricted cash and cash equivalents	39,473		7,794		102,565		9,619
Dividends on equity securities	31,134		25,962		84,968		74,289
	196,266		116,549		534,070		314,093
Investment expenses	(4,059)		(3,935)		(12,835)		(12,380)
Net investment income	$	192,207	$	112,614	$	521,235	$	301,713

e) The following table presents the components of net investment gains (losses) included in net income (loss) and the change in net unrealized gains (losses) included in other comprehensive loss. Gross realized investment gains and losses on fixed maturity securities, short-term investments and other investments were not material to the consolidated financial statements and are presented on a net basis in the following table.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Fixed maturity securities, short-term investments and other investments:
Net realized investment gains (losses)	$	(36,093)	$	2,032	$	(38,159)	$	6,001
Equity securities:
Change in fair value of securities sold during the period	2,683		2,553		16,706		(29,015)
Change in fair value of securities held at the end of the period	(232,507)		(286,068)		612,626		(2,171,511)
Total change in fair value	(229,824)		(283,515)		629,332		(2,200,526)
Net investment gains (losses)	$	(265,917)	$	(281,483)	$	591,173	$	(2,194,525)
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive loss:
Fixed maturity securities	$	(208,598)	$	(530,161)	$	(167,411)	$	(1,645,060)
Short-term investments	193		(8,186)		(3,195)		(11,563)
Net decrease	$	(208,405)	$	(538,347)	$	(170,606)	$	(1,656,623)

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Fair Value Measurements

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

FASB ASC 820, Fair Value Measurements and Disclosures, establishes a three-level hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the assets or liabilities fall within different levels of the hierarchy, the classification is based on the lowest level input that is significant to the fair value measurement of the asset or liability.

Classification of assets and liabilities within the hierarchy considers the markets in which the assets and liabilities are traded and the reliability and transparency of the assumptions used to determine fair value. The hierarchy requires the use of observable market data when available. The levels of the hierarchy are defined as follows:

•Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities traded in active markets.

•Level 2 – Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and market-corroborated inputs.

•Level 3 – Inputs to the valuation methodology are unobservable for the asset or liability and are significant to the fair value measurement.

In accordance with ASC 820, the Company determines fair value based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining fair value, the Company uses various methods, including the market, income and cost approaches. The Company uses valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The following section describes the valuation methodologies used by the Company to measure assets and liabilities at fair value, including an indication of the level within the fair value hierarchy in which each asset or liability is generally classified.

Available-for-sale investments and equity securities. Available-for-sale investments and equity securities are recorded at fair value on a recurring basis. Available-for-sale investments include fixed maturity securities and short-term investments. Fair value is determined by the Company after considering various sources of information, including information provided by a third-party pricing service. The pricing service provides prices for substantially all of the Company's fixed maturity securities and equity securities. In determining fair value, the Company generally does not adjust the prices obtained from the pricing service. The Company obtains an understanding of the pricing service's valuation methodologies and related inputs, which include, but are not limited to, reported trades, benchmark yields, issuer spreads, bids, offers, duration, credit ratings, estimated cash flows and prepayment speeds. The Company validates prices provided by the pricing service by reviewing prices from other pricing sources and analyzing pricing data in certain instances.

The Company has evaluated the various types of securities in its investment portfolio to determine an appropriate fair value hierarchy level based upon trading activity and the observability of market inputs. Level 1 investments include those traded on an active exchange, such as the New York Stock Exchange. Level 2 investments include U.S. Treasury securities, U.S. government-sponsored enterprises, municipal bonds, foreign government bonds, commercial mortgage-backed securities, residential mortgage-backed securities, asset-backed securities and corporate debt securities. Level 3 investments include the Company's investments in insurance-linked securities funds that are in run-off, which are not traded on an active exchange and are valued using unobservable inputs.

Fair value for available-for-sale investments and equity securities is measured based upon quoted prices in active markets, if available. Due to variations in trading volumes and the lack of quoted market prices, fixed maturity securities are classified as Level 2 investments. The fair value of fixed maturity securities is normally derived through recent reported trades for identical or similar securities, making adjustments through the reporting date based upon available market observable data previously described. If there are no recent reported trades, the fair value of fixed maturity securities may be derived through the use of matrix pricing or model processes, where future cash flow expectations are developed based upon collateral performance and discounted at an estimated market rate. Significant inputs used to determine the fair value of obligations of states, municipalities and political subdivisions, corporate bonds and obligations of foreign governments include reported trades, benchmark yields, issuer spreads, bids, offers, credit information and estimated cash flows. Significant inputs used to determine the fair value of commercial mortgage-backed securities, residential mortgage-backed securities and asset-backed securities include the type of underlying assets, benchmark yields, prepayment speeds, collateral information, tranche type and volatility, estimated cash flows, credit information, default rates, recovery rates, issuer spreads and the year of issue.

Senior long-term debt and other debt. Senior long-term debt and other debt is carried at amortized cost with the estimated fair value disclosed on the consolidated balance sheets. Senior long-term debt and other debt is classified as Level 2 within the fair value hierarchy due to variations in trading volumes and the lack of quoted market prices. Fair value is generally derived through recent reported trades, making adjustments through the reporting date, if necessary, based upon available market observable data including U.S. Treasury securities and implied credit spreads. Significant inputs used to determine the fair value of senior long-term debt and other debt include reported trades, benchmark yields, issuer spreads, bids and offers.

The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.

	September 30, 2023
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments:
Fixed maturity securities, available-for-sale:
U.S. Treasury securities	$	—	$	3,310,829	$	—	$	3,310,829
U.S. government-sponsored enterprises	—		995,684		—		995,684
Obligations of states, municipalities and political subdivisions	—		3,798,946		—		3,798,946
Foreign governments	—		1,563,119		—		1,563,119
Commercial mortgage-backed securities	—		2,089,373		—		2,089,373
Residential mortgage-backed securities	—		478,840		—		478,840
Asset-backed securities	—		1,198		—		1,198
Corporate bonds	—		713,290		—		713,290
Total fixed maturity securities, available-for-sale	—		12,951,279		—		12,951,279
Equity securities:
Insurance, banks and other financial institutions	3,304,299		—		942		3,305,241
Industrial, consumer and all other	5,269,716		—		—		5,269,716
Total equity securities	8,574,015		—		942		8,574,957
Short-term investments, available-for-sale	2,085,072		167,654		—		2,252,726
Total investments	$	10,659,087	$	13,118,933	$	942	$	23,778,962

	December 31, 2022
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments:
Fixed maturity securities, available-for-sale:
U.S. Treasury securities	$	—	$	2,913,959	$	—	$	2,913,959
U.S. government-sponsored enterprises	—		765,538		—		765,538
Obligations of states, municipalities and political subdivisions	—		3,733,183		—		3,733,183
Foreign governments	—		1,306,778		—		1,306,778
Commercial mortgage-backed securities	—		1,940,448		—		1,940,448
Residential mortgage-backed securities	—		526,793		—		526,793
Asset-backed securities	—		1,640		—		1,640
Corporate bonds	—		668,496		—		668,496
Total fixed maturity securities, available-for-sale	—		11,856,835		—		11,856,835
Equity securities:
Insurance, banks and other financial institutions	2,952,689		—		899		2,953,588
Industrial, consumer and all other	4,718,324		—		—		4,718,324
Total equity securities	7,671,013		—		899		7,671,912
Short-term investments, available-for-sale	2,510,164		159,098		—		2,669,262
Total investments	$	10,181,177	$	12,015,933	$	899	$	22,198,009

The following table summarizes changes in Level 3 investments measured at fair value on a recurring basis.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Equity securities, beginning of period	$	936	$	4,380	$	899	$	56,472
Purchases	—		—		—		—
Sales	—		(3,528)		—		(56,335)
Net investment gains	6		69		43		784
Equity securities, end of period	$	942	$	921	$	942	$	921

Previously, Level 3 investments included the Company's investment in an insurance-linked securities fund managed by Markel CATCo Investment Management Ltd. (MCIM). During the first quarter of 2022, the Company's remaining investment was redeemed ($41.3 million) in conjunction with a buy-out transaction that provided for an accelerated return of all remaining capital to investors. See note 11 for further details about the Company's Markel CATCo operations and the buy-out transaction.

The Company did not have any assets or liabilities measured at fair value on a non-recurring basis during the nine months ended September 30, 2023 and 2022.

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Equity Method Investments

9 Months Ended

Sep. 30, 2023

Equity Method Investments [Abstract]

Equity Method Investments Disclosure [Text Block]

Equity Method Investments The Company holds certain investments that are accounted for under the equity method of accounting. The Company's equity method investments, which are included in other assets on the consolidated balance sheets, totaled $582.8 million and $494.0 million as of September 30, 2023 and December 31, 2022, respectively. The Company's proportionate share of earnings in its equity method investments was income of $4.2 million and losses of $0.4 million for the quarter and nine months ended September 30, 2023, respectively, and losses of $7.1 million and $36.1 million for the quarter and nine months ended September 30, 2022, respectively.

The Company's most significant equity method investment is an investment in Hagerty, Inc. (Hagerty), which is accounted for on a quarter lag. Hagerty is an automotive enthusiast brand offering integrated membership products and programs as well as a specialty insurance provider focused on the global automobile enthusiast market. The Company's ownership interest in Hagerty's common stock was 23% as of September 30, 2023 and December 31, 2022. The Company's investment is comprised of Class A common shares, which are listed for trading on the New York Stock Exchange, as well as Class V common shares, associated with the Company's original investment, that have special voting rights and can be converted on a one-for-one basis into Class A common shares. The Company accounts for its investment under the equity method as it is deemed to have the ability to exercise significant influence over Hagerty's operating and financial policies through a combination of its voting interest, its right to designate a board member and business it conducts with Hagerty. As of September 30, 2023 and December 31, 2022, the carrying value of the Company's investment in Hagerty was $235.4 million and $245.1 million, respectively.

As of September 30, 2023 and December 31, 2022, the estimated value of the Company's investment, based on the closing stock price of Hagerty's Class A common shares, was $637.3 million and $656.0 million, respectively. See note 12 for further details regarding related party transactions with Hagerty.

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Products, Services and Other Revenues

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Products, Services and Other Revenues

Products, Services, and Other Revenues

The following tables present revenues from contracts with customers by type, all of which are included in products revenues and services and other revenues in the consolidated statements of income (loss) and comprehensive income (loss), along with a reconciliation to total products revenues and services and other revenues.

	Quarter Ended September 30,
	2023						2022
(dollars in thousands)	Markel Ventures		Other		Total		Markel Ventures		Other		Total
Products	$	585,707	$	—	$	585,707	$	575,277	$	—	$	575,277
Services	597,512		2,904		600,416		594,717		11,529		606,246
Investment management	—		44,204		44,204		—		15,641		15,641
Total revenues from contracts with customers	1,183,219		47,108		1,230,327		1,169,994		27,170		1,197,164
Program services and other fronting	—		39,499		39,499		—		40,033		40,033
Equity method investments income (loss)	(21)		4,264		4,243		(546)		(6,555)		(7,101)
Other	62,379		(9,297)		53,082		46,298		1,790		48,088
Total	$	1,245,577	$	81,574	$	1,327,151	$	1,215,746	$	62,438	$	1,278,184

	Nine Months Ended September 30,
	2023						2022
(dollars in thousands)	Markel Ventures		Other		Total		Markel Ventures		Other		Total
Products	$	1,921,773	$	—	$	1,921,773	$	1,809,276	$	—	$	1,809,276
Services	1,652,187		7,542		1,659,729		1,593,946		41,547		1,635,493
Investment management	—		76,108		76,108		—		55,197		55,197
Total revenues from contracts with customers	3,573,960		83,650		3,657,610		3,403,222		96,744		3,499,966
Program services and other fronting	—		105,952		105,952		—		103,096		103,096
Disposition gain	—		16,923		16,923		—		107,293		107,293
Equity method investments income (loss)	1,087		(1,485)		(398)		1,537		(37,639)		(36,102)
Other	160,282		(12,258)		148,024		122,670		10,773		133,443
Total	$	3,735,329	$	192,782	$	3,928,111	$	3,527,429	$	280,267	$	3,807,696

In February 2022, the Company sold the majority of its controlling interest in its Velocity managing general agent companies, which resulted in a gain of $107.3 million. In June 2023, the Company sold one of its licensed insurance subsidiaries to Velocity, which resulted in a gain of $16.9 million. Both gains were included in services and other revenues.

Receivables from contracts with customers were $683.1 million and $624.1 million as of September 30, 2023 and December 31, 2022, respectively.

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Unpaid Losses And Loss Adjustment Expenses

9 Months Ended

Sep. 30, 2023

Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]

Unpaid Losses And Loss Adjustment Expenses

Unpaid Losses and Loss Adjustment Expenses

The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses.

	Nine Months Ended September 30,
(dollars in thousands)	2023		2022
Gross reserves for losses and loss adjustment expenses, beginning of year	$	20,947,898	$	18,178,894
Reinsurance recoverables on unpaid losses, beginning of year	7,994,884		6,876,317
Net reserves for losses and loss adjustment expenses, beginning of year	12,953,014		11,302,577
Effect of foreign currency rate changes on beginning of year balance	16,246		(275,364)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year	12,969,260		11,027,213
Incurred losses and loss adjustment expenses:
Current accident year	3,934,969		3,420,906
Prior accident years	(169,754)		(204,411)
Total incurred losses and loss adjustment expenses	3,765,215		3,216,495
Payments:
Current accident year	419,998		350,684
Prior accident years	2,018,199		1,880,471
Total payments	2,438,197		2,231,155
Effect of foreign currency rate changes on current year activity	416		(7,499)
Change in net reserves for losses and loss adjustment expenses of Markel CATCo Re (see note 11)	(146,895)		375,222
Reinsurance recoverable for retroactive reinsurance transaction	(125,067)		—
Net reserves for losses and loss adjustment expenses, end of period	14,024,732		12,380,276
Reinsurance recoverables on unpaid losses	8,119,634		7,814,098
Gross reserves for losses and loss adjustment expenses, end of period	$	22,144,366	$	20,194,374

For the nine months ended September 30, 2023, current accident year losses and loss adjustment expenses included $46.2 million of net losses and loss adjustment expenses attributed to the Hawaiian wildfires and Hurricane Idalia (2023 Catastrophes). The net losses and loss adjustment expenses attributed to the 2023 Catastrophes as of September 30, 2023 represent the Company's best estimate based upon information currently available. The estimate for these losses is based on preliminary industry loss estimates and output from industry, broker and proprietary models, as well as policy level reviews. This estimate is based on various assumptions about coverage and liability and is therefore subject to change. While the Company believes its net reserves for the 2023 Catastrophes as of September 30, 2023 are adequate, it continues to closely monitor reported claims and may adjust the estimate of net losses as new information becomes available.

During 2023, the Company also recognized losses on its intellectual property collateral protection insurance product written within the Insurance segment's professional liability product line. These losses reflect higher than anticipated levels of claims and loss experience, as well as the recognition of $25.0 million of credit losses in connection with a $50.0 million fraudulent letter of credit that was provided by an affiliate of Vesttoo Ltd. as collateral for reinsurance purchased on one of the policies that resulted in a claim during the quarter. An affiliate of Vesttoo Ltd. is also the counterparty to a second ceded reinsurance contract on this product line with an aggregate limit of $77.8 million for which the underlying letter of credit was also deemed to be fraudulent. Although a loss has not yet been incurred under this policy, the Company believes the potential for a covered loss event is reasonably possible. The Company is actively pursuing remedies to make recoveries on the reinsurance recoverable impacted by the fraudulent letter of credit and to mitigate the potential for additional losses resulting from the second fraudulent letter of credit if a claim is made under the related contract. The Company does not have any other ceded reinsurance contracts with Vesttoo Ltd. or its affiliates.

For the nine months ended September 30, 2023, prior accident years losses and loss adjustment expenses included $169.8 million of favorable development on prior years loss reserves, which included $239.8 million of favorable development on the Company's professional liability, property, marine and energy, workers' compensation and personal lines product lines within its Insurance segment and $34.1 million of favorable development on the Company's professional liability and property product lines within its Reinsurance segment. Favorable development on prior years loss reserves for the nine months ended September 30, 2023 was partially offset by $70.5 million of adverse development on the Company's general liability product lines within its Insurance segment and $60.9 million of adverse development on the Company's public entity and general liability product lines within its Reinsurance segment.

In March 2023, the Company completed a retroactive reinsurance transaction to cede its portfolio of policies comprised of liabilities for its run-off book of United Kingdom motor casualty business in exchange for payments totaling $125.1 million, which approximated the carrying value of the Company's reserves for losses and loss adjustment expenses on the ceded policies.

For the nine months ended September 30, 2022, current accident year losses and loss adjustment expenses included $70.0 million and $35.0 million of net losses and loss adjustment expenses attributed to Hurricane Ian and the Russia-Ukraine conflict, respectively.

For the nine months ended September 30, 2022, prior accident years losses and loss adjustment expenses included $204.4 million of favorable development on prior years loss reserves, which included $155.0 million of favorable development on the Company's workers' compensation, property, marine and energy and programs product lines within the Insurance segment and $41.7 million of favorable development on the Company's property and credit and surety product lines within its Reinsurance segment.

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Reinsurance

9 Months Ended

Sep. 30, 2023

Reinsurance Disclosures [Abstract]

Reinsurance

Reinsurance

The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Quarter Ended September 30,
	2023								2022
(dollars in thousands)	Direct		Assumed		Ceded		Net Premiums		Direct		Assumed		Ceded		Net Premiums
Underwriting:
Written	$	2,223,988	$	282,070	$	(478,035)	$	2,028,023	$	2,133,822	$	349,650	$	(473,885)	$	2,009,587
Earned	$	2,127,244	$	424,620	$	(429,901)	$	2,121,963	$	1,899,816	$	408,561	$	(351,118)	$	1,957,259
Program services and other fronting:
Written	615,424		557,324		(1,172,966)		(218)		663,631		327,668		(991,719)		(420)
Earned	669,544		313,079		(982,841)		(218)		729,312		218,439		(948,180)		(429)
Consolidated:
Written	$	2,839,412	$	839,394	$	(1,651,001)	$	2,027,805	$	2,797,453	$	677,318	$	(1,465,604)	$	2,009,167
Earned	$	2,796,788	$	737,699	$	(1,412,742)	$	2,121,745	$	2,629,128	$	627,000	$	(1,299,298)	$	1,956,830

	Nine Months Ended September 30,
	2023								2022
(dollars in thousands)	Direct		Assumed		Ceded		Net Premiums		Direct		Assumed		Ceded		Net Premiums
Underwriting:
Written	$	6,479,090	$	1,419,802	$	(1,444,626)	$	6,454,266	$	6,065,936	$	1,466,036	$	(1,255,226)	$	6,276,746
Earned	$	6,124,444	$	1,247,743	$	(1,250,605)	$	6,121,582	$	5,370,481	$	1,194,504	$	(1,012,485)	$	5,552,500
Program services and other fronting:
Written	2,012,806		991,305		(3,005,101)		(990)		2,025,195		595,940		(2,624,185)		(3,050)
Earned	1,960,219		546,871		(2,508,080)		(990)		2,036,016		332,415		(2,371,227)		(2,796)
Consolidated:
Written	$	8,491,896	$	2,411,107	$	(4,449,727)	$	6,453,276	$	8,091,131	$	2,061,976	$	(3,879,411)	$	6,273,696
Earned	$	8,084,663	$	1,794,614	$	(3,758,685)	$	6,120,592	$	7,406,497	$	1,526,919	$	(3,383,712)	$	5,549,704

Substantially all of the premiums written and earned in the Company's program services and other fronting operations for the nine months ended September 30, 2023 and 2022 were ceded. The percentage of consolidated ceded earned premiums to gross earned premiums was 40% and 38% for the quarter and nine months ended September 30, 2023, respectively, and 40% and 38% for the quarter and nine months ended September 30, 2022, respectively. The percentage of consolidated assumed earned premiums to net earned premiums was 35% and 29% for the quarter and nine months ended September 30, 2023, respectively, and 32% and 28% for the quarter and nine months ended September 30, 2022, respectively.

Substantially all of the incurred losses and loss adjustment expenses in the Company's program services and other fronting operations were ceded. These gross losses totaled $743.8 million and $1.8 billion for the quarter and nine months ended September 30, 2023, respectively, and $1.3 billion and $2.3 billion for the quarter and nine months ended September 30, 2022, respectively.

The following table summarizes the effect of reinsurance and retrocessional reinsurance on losses and loss adjustment expenses in the Company's underwriting operations.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Gross losses and loss adjustment expenses	$	1,684,389	$	1,423,526	$	4,552,926	$	3,760,566
Ceded losses and loss adjustment expenses	(278,945)		(238,220)		(786,876)		(544,109)
Net losses and loss adjustment expenses	$	1,405,444	$	1,185,306	$	3,766,050	$	3,216,457

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Life and Annuity Benefits

9 Months Ended

Sep. 30, 2023

Liability for Future Policy Benefit, before Reinsurance [Abstract]

Life and Annuity Benefits

Life and Annuity Benefits

The Company's run-off block of life and annuity reinsurance contracts consists primarily of Euro and U.S. Dollar denominated life-contingent payout annuities and traditional and universal life contracts. The following table presents the components of the Company's liabilities for life and annuity benefits.

(dollars in thousands)	September 30, 2023		December 31, 2022
Liability for future policyholder benefits	$	508,436	$	554,366
Deferred profit liability	52,034		48,569
Other	39,786		47,786
Total	$	600,256	$	650,721

The primary component of the Company's liabilities for life and annuity benefits is the liability for future policyholder benefits. Life and annuity benefit reserves are calculated for aggregated cohorts of contracts, which are determined based on the attributes of the underlying contracts, and are discounted using standard actuarial techniques and cash flow models. Since the development of the life and annuity reinsurance reserves is based upon cash flow projection models, the Company makes estimates and assumptions based on cedent experience and industry mortality tables. The cash flow assumptions used to determine the Company's life and annuity benefit reserves are reviewed, and updated as necessary, at least annually. The discount rate assumptions are updated at each reporting date. There were no changes to the cash flow assumptions used to measure the Company's life and annuity benefit reserves as a result of the annual review of cash flow assumptions completed in the third quarter of 2023 and 2022. The following table presents a rollforward of the present value of the liability for future policyholder benefits.

	Nine Months Ended September 30,
(dollars in thousands)	2023		2022
Liability for future policyholder benefits, beginning of year	$	554,366	$	821,632
Liability for future policyholder benefits at original discount rate, beginning of year	667,761		745,313
Effect of changes in cash flow assumptions	—		—
Effect of actual variances from expected experience	(5,890)		(3,859)
Adjusted liability for future policyholder benefits, beginning of year	661,871		741,454
Interest accretion	11,251		11,909
Benefit payments	(39,819)		(40,643)
Effect of foreign currency rate changes	(356)		(77,166)
Liability for future policyholder benefits at original discount rate, end of period	632,947		635,554
Cumulative effect of changes in discount rate assumptions	(124,511)		(112,459)
Liability for future policyholder benefits, end of period (1)	$	508,436	$	523,095

(1)    The undiscounted liability for future policyholder benefits was $813.6 million and $822.3 million as of September 30, 2023 and 2022, respectively.

The following table summarizes additional details for the Company's liability for future policyholder benefits.

	September 30, 2023		December 31, 2022
Weighted-average interest rate:
Interest accretion rate	2.3	%	2.3	%
Current discount rate	4.7	%	4.3	%
Weighted-average liability duration	8.2 years		8.6 years

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Senior Long-Term Debt and Other Debt

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Debt Disclosure

Senior Long-Term Debt and Other Debt In March 2023, the Company retired its 3.625% unsecured senior notes due March 30, 2023 ($250.0 million aggregate principal outstanding at December 31, 2022).

In June 2023, the Company entered into an amended and restated credit agreement for its corporate revolving credit facility, which provides up to $300 million of capacity for future acquisitions, investments and stock repurchases, and for other working capital and general corporate purposes. At the Company's discretion, up to $200 million of the total capacity may be used for letters of credit. The Company may increase the capacity of the facility by up to $200 million subject to obtaining commitments for the increase and certain other terms and conditions. The Company pays interest on balances outstanding under the facility and fees for letters of credit issued under the facility. The Company also pays a commitment fee on the unused portion of the facility based on the Company's leverage ratio as calculated under the credit agreement. The credit agreement includes financial covenants that require that the Company not exceed a maximum debt to capitalization (leverage) ratio and maintain a minimum amount of consolidated net worth, as well as other customary covenants and events of default. Markel Group guaranteed the obligations under the facility of certain subsidiaries that are also parties to the credit agreement. This facility expires in June 2028. The credit agreement for this revolving credit facility amended and restated the credit agreement for the Company's previous $300 million revolving credit facility. At September 30, 2023 and December 31, 2022, the Company had no borrowings outstanding under either revolving credit facility. As of September 30, 2023, the Company was in compliance with all covenants contained in its corporate revolving credit facility.

Various of the Company's Markel Ventures subsidiaries maintain revolving credit facilities or lines of credit, which provide up to $715 million of aggregate capacity for working capital and other general operational purposes. A portion of the capacity on certain of these credit facilities may be used as security for letters of credit and other obligations. At September 30, 2023 and December 31, 2022, the Company had $171.3 million and $238.1 million, respectively, of borrowings outstanding under these credit facilities. As of September 30, 2023, all of the Company's subsidiaries were in compliance with all covenants contained in their respective credit facilities.

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Variable Interest Entities

9 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entities

Variable Interest Entities

MCIM, a wholly-owned consolidated subsidiary of the Company, is an insurance-linked securities investment fund manager and reinsurance manager headquartered in Bermuda. Results attributable to MCIM are not included in a reportable segment.

MCIM serves as the insurance manager for Markel CATCo Re Ltd. (Markel CATCo Re), a Bermuda Class 3 reinsurance company, and as the investment manager for Markel CATCo Reinsurance Fund Ltd., a Bermuda exempted mutual fund company comprised of multiple segregated accounts (Markel CATCo Funds). Voting shares in Markel CATCo Reinsurance Fund Ltd. and Markel CATCo Re are held by MCIM, which has the power to direct the activities that most significantly impact the economic performance of these entities. The Markel CATCo Funds issued multiple classes of nonvoting, redeemable preference shares to investors, and the Markel CATCo Funds are primarily invested in nonvoting preference shares of Markel CATCo Re. The underwriting results of Markel CATCo Re are attributed to investors through its nonvoting preference shares. Both Markel CATCo Re and the Markel CATCo Funds were placed into run-off in July 2019.

In March 2022, the Company completed a buy-out transaction with Markel CATCo Re and the Markel CATCo Funds that provided for an accelerated return of all remaining capital to investors in the Markel CATCo Funds. Under the terms of the transaction, the Company provided cash funding of $45.1 million to purchase substantially all of the Markel CATCo Funds' interests in Markel CATCo Re and substantially all of the preference shares held by investors in the Markel CATCo Funds were redeemed, including preference shares previously held by the Company. See note 4 for details regarding the Company's investment in the Markel CATCo Funds. In order to complete the transaction, the Company also made $101.9 million in additional payments, net of insurance proceeds, to or for the benefit of investors, which were recognized as an expense to the Company and included in services and other expenses for the first quarter of 2022.

In June 2022, the Company received a return of $24.9 million of the capital it provided in March 2022 and the related preference shares were redeemed. As of September 30, 2023 and December 31, 2022, the Company's investment in the remaining preference shares of Markel CATCo Re totaled $20.1 million, which comprised 25% and 23% of the equity of Markel CATCo Re, respectively. Through that investment, the Company has exposure to adverse loss development on reinsurance contracts previously written by Markel CATCo Re for loss events that occurred from 2014 to 2020. If loss reserves held by Markel CATCo Re are sufficient to settle claims on the remaining open contracts, the Company will receive a full return of the remaining $20.1 million in capital provided in March 2022. Favorable development on loss reserves held by Markel CATCo Re, less operating expenses, will be distributed to the Markel CATCo Funds, and ultimately to investors in the Markel CATCo Funds.

Markel CATCo Re is considered a VIE, as the equity at risk does not have the right to receive residual returns that exceed the capital provided by the Company in the buy-out transaction. As a result of the preference shares acquired by the Company in the buy-out transaction, and the voting shares held by its consolidated subsidiary, MCIM, the Company consolidates Markel CATCo Re as its primary beneficiary. Results attributed to the run-off of Markel CATCo Re are reported with the Company's other ILS operations, within services and other revenues and expenses, and are not included in a reportable segment. Favorable loss reserve development on the run-off of reinsurance contracts written by Markel CATCo Re was $2.2 million and $55.7 million for the quarter and nine months ended September 30, 2023, respectively, and $53.4 million and $81.6 million for the quarter and nine months ended September 30, 2022, respectively. For all periods, the favorable development was included in services and other expenses and attributable to noncontrolling interests. During the nine months ended September 30, 2023 and 2022, $62.6 million and $22.3 million, respectively, of preference shares of Markel CATCo Re held by noncontrolling interests were redeemed.

The Company's consolidated balance sheets include the following amounts attributable to Markel CATCo Re.

(dollars in thousands)	September 30, 2023		December 31, 2022
Assets
Cash and cash equivalents	$	70,852	$	104,443
Restricted cash and cash equivalents	193,778		317,577
Other assets and receivables due from cedents	19,416		41,357
Total Assets	$	284,046	$	463,377
Liabilities and Equity
Unpaid losses and loss adjustment expenses	$	201,026	$	347,921
Other liabilities	1,232		26,717
Total Liabilities	202,258		374,638
Shareholders' equity	21,139		21,139
Noncontrolling interests	60,649		67,600
Total Equity	81,788		88,739
Total Liabilities and Equity	$	284,046	$	463,377

In connection with the buy-out transaction, the Company also entered into a tail risk cover with Markel CATCo Re. Through this contract, the Company has $142.7 million of uncollateralized exposure to adverse development on loss reserves held by Markel CATCo Re for loss exposures in excess of limits that the Company believes are unlikely to be exceeded.

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Related Party Transactions

9 Months Ended

Sep. 30, 2023

Related Party Transactions [Abstract]

Related Party Transactions Disclosure [Text Block]

Related Party Transactions

The Company engages in certain related party transactions in the normal course of business at arm's length.

Insurance-Linked Securities

Within the Company's insurance-linked securities operations, the Company provides investment and insurance management services through Nephila Holdings Ltd. (together with its subsidiaries, Nephila). Nephila serves as the investment manager to several Bermuda based private funds (the Nephila Funds). To provide access for the Nephila Funds to a variety of insurance-linked securities in the property catastrophe, climate and specialty markets, Nephila also acts as an insurance manager to certain Bermuda Class 3 and 3A reinsurance companies, Lloyd's Syndicate 2357 and Lloyd's Syndicate 2358 (collectively, the Nephila Reinsurers). Nephila receives management fees for investment and insurance management services provided through its insurance-linked securities operations primarily based on the net asset value of the accounts managed, and, for certain funds, incentive fees based on their annual performance. Prior to the disposition of Velocity in February 2022, Nephila also provided managing general agent services to the Nephila Reinsurers in exchange for commissions. For the quarter and nine months ended September 30, 2023, total revenues attributed to unconsolidated entities managed by Nephila were $43.6 million and $74.1 million, respectively. For the quarter and nine months ended September 30, 2022, total revenues attributed to unconsolidated entities managed by Nephila were $17.1 million and $57.0 million, respectively.

Through the Company's program services and other fronting operations, as well as its underwriting operations, the Company has programs with Nephila through which the Company writes insurance policies that are either partially or fully ceded to Nephila Reinsurers. Through these programs, Nephila utilizes certain of the Company's licensed insurance companies to write U.S. catastrophe-exposed property risk that is then ceded to Nephila Reinsurers. A portion of this business is placed by Velocity, which the Company retained a minority interest in following its disposition. Additionally, through the Company's insurance underwriting operations, the Company has a quota share agreement with Nephila through which it cedes a portion of its property business to Nephila Reinsurers. The following table summarizes the premiums ceded to Nephila Reinsurers.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Program services and other fronting:
Gross and ceded written premiums attributable to Nephila programs	$	501,838	$	398,872	$	1,036,126	$	889,644
Underwriting:
Premiums ceded to Nephila Reinsurers	$	10,058	$	15,037	$	39,905	$	44,656

As of September 30, 2023 and December 31, 2022, reinsurance recoverables on the consolidated balance sheets included $874.1 million and $1.4 billion, respectively, due from Nephila Reinsurers. Under its programs with Nephila Reinsurers, the Company bears underwriting risk for annual aggregate agreement year losses in excess of a limit the Company believes is unlikely to be exceeded. To the extent losses under these programs exceed the prescribed limits, the Company is obligated to pay such losses to the cedents without recourse to the Nephila Reinsurers. While the Company believes losses under these programs are unlikely, those losses, if incurred, could be material to the Company's consolidated results of operations and financial condition.

The Company has also entered into other assumed and ceded reinsurance transactions with the Nephila Reinsurers in the normal course of business, which are not material to the Company's consolidated financial statements.

In June 2023, the Company sold one of the licensed insurance subsidiaries within its program services operations to Velocity, which resulted in a gain of $16.9 million during the second quarter of 2023.

Hagerty

The Company holds a minority ownership interest in Hagerty, which operates primarily as a managing general agent and also includes Hagerty Reinsurance Limited (Hagerty Re), a Bermuda Class 3 reinsurance company. Through the Company's underwriting operations, the Company underwrites insurance for Hagerty, a portion of which is ceded to Hagerty Re. The amounts attributed to these arrangements are summarized in the following table.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Gross written premiums attributable to Hagerty	$	227,693	$	197,041	$	628,889	$	540,447
Premiums ceded to Hagerty Re	$	174,455	$	130,430	$	480,924	$	357,729

As of September 30, 2023 and December 31, 2022, reinsurance recoverables on the consolidated balance sheets included $200.0 million and $159.7 million, respectively, due from Hagerty Re.

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Shareholders' Equity

9 Months Ended

Sep. 30, 2023

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders' Equity

a) The Company has 50,000,000 shares of no par value common stock authorized. The following table presents a rollforward of changes in common shares issued and outstanding.

	Quarter Ended September 30,		Nine Months Ended September 30,
(shares in ones)	2023	2022	2023	2022
Issued and outstanding common shares, beginning of period	13,284,998	13,537,895	13,422,692	13,631,740
Issuance of common shares	3,007	694	5,475	2,886
Repurchase of common shares	(56,483)	(67,696)	(196,645)	(163,733)
Issued and outstanding common shares, end of period	13,231,522	13,470,893	13,231,522	13,470,893

b) The Company also has 10,000,000 shares of no par value preferred stock authorized, of which 600,000 shares were issued and outstanding at September 30, 2023 and December 31, 2022. The Company declared and paid dividends on preferred shares of $18.0 million, or $30 per share, in both the second quarter of 2023 and 2022.

c) Net income (loss) per common share was determined by dividing adjusted net income (loss) to common shareholders by the applicable weighted average common shares outstanding. Basic common shares outstanding include restricted stock units that are no longer subject to any contingencies for issuance, but for which corresponding shares have not been issued. Diluted net income (loss) per common share is computed by dividing adjusted net income (loss) to common shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the period. The following table presents net income (loss) per common share and diluted net income (loss) per common share.

	Quarter Ended September 30,				Nine Months Ended September 30,
(in thousands, except per share amounts)	2023		2022		2023		2022
Net income (loss) to common shareholders	$	42,591	$	59,594	$	1,208,754	$	(925,943)
Adjustment of redeemable noncontrolling interests	(628)		(17,730)		7,087		(62,168)
Adjusted net income (loss) to common shareholders	$	41,963	$	41,864	$	1,215,841	$	(988,111)
Basic common shares outstanding	13,315		13,564		13,382		13,609
Dilutive potential common shares from restricted stock units and restricted stock (1)	30		31		24		—
Diluted common shares outstanding	13,345		13,595		13,406		13,609
Basic net income (loss) per common share	$	3.15	$	3.09	$	90.86	$	(72.61)
Diluted net income (loss) per common share (1)	$	3.14	$	3.08	$	90.69	$	(72.61)

(1)     The impact of 28 thousand shares from restricted stock units and restricted stock was excluded from the computation of diluted net loss per common share for the nine months ended September 30, 2022 because the effect would have been anti-dilutive.

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Contingencies	9 Months Ended
	Sep. 30, 2023
Loss Contingency [Abstract]
Contingencies	Contingencies Contingencies arise in the normal course of the Company's operations and are not expected to have a material impact on the Company's financial condition or results of operations.

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Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income (loss) to common shareholders	$ 42,591	$ 59,594	$ 1,226,754	$ (907,943)

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Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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Summary Of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation. The consolidated balance sheet as of September 30, 2023 and the related consolidated statements of income (loss) and comprehensive income (loss) and changes in equity for the quarters and nine months ended September 30, 2023 and 2022, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2023 and 2022 are unaudited. In the opinion of management, all adjustments necessary for fair presentation of such consolidated financial statements have been included. Except for the adjustments described in note 1 c), such adjustments consist only of normal, recurring items. Interim results are not necessarily indicative of results of operations for the entire year. The consolidated balance sheet as of December 31, 2022 was derived from Markel Group's audited annual consolidated financial statements.

The accompanying consolidated financial statements have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) and include the accounts of Markel Group and its consolidated subsidiaries, as well as variable interest entities (VIEs) that meet the requirements for consolidation (the Company). All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates the results of its Markel Ventures subsidiaries on a one-month lag, with the exception of significant transactions or events that occur during the intervening period. Certain prior period amounts have been reclassified to conform to the current period presentation.

The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

The consolidated financial statements and notes are presented as permitted by Form 10-Q and do not contain certain information included in the Company's annual consolidated financial statements and notes. The following accounting policy was updated to reflect an accounting standard that became effective January 1, 2023. See note 1 c). For a more complete description of the Company's business and accounting policies, readers are urged to review the Company's 2022 Annual Report on Form 10-K.

Life and Annuity Benefits

Life and Annuity Benefits. The Company has a run-off block of life and annuity reinsurance contracts that subject the Company to mortality, longevity and morbidity risks. Effective January 1, 2023, the Company adopted Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2018-12, Financial Services—Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts and restated all prior periods presented to reflect the new accounting standard. The primary component of the Company's liabilities for life and annuity benefits is the present value of the liability for future policyholder benefits. The cash flow assumptions used to determine the policyholder benefit reserves are reviewed, and updated as necessary, at least annually. Interest accretion for the reserves is calculated using the discount rate locked-in at contract inception. Policy benefit reserves are remeasured each period using current discount rates, based on yields for upper-medium grade fixed maturity securities, with the impact of changes in the discount rate included in other comprehensive income, net of taxes. All other results attributable to the run-off of life and annuity reinsurance contracts are included in services and other revenues and services and other expenses in the consolidated statements of income and comprehensive income. Investment income earned on the investments that support the policy benefit reserves are included in net investment income. Because of the uncertainty in the assumptions used to estimate reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimated liability. See note 9 for further details regarding life and annuity benefits.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Accounting Standards Adopted

Effective January 1, 2023, the Company adopted ASU No. 2018-12 and several ASUs issued as amendments to ASU No. 2018-12. This standard requires insurance companies with long duration contracts to: (1) review and, if there is a change, update the assumptions used to measure expected cash flows at least annually; (2) update the discount rate assumption at each reporting date; and (3) enhance certain qualitative and quantitative disclosures. ASU No. 2018-12 was applied using a modified retrospective approach that required restatement of prior periods presented, including a cumulative adjustment recorded to accumulated other comprehensive income as of January 1, 2021 (the transition date) as a result of updating the discount rate assumption. At the transition date, the adoption of ASU 2018-12 had no impact on retained earnings but resulted in a decrease to accumulated other comprehensive income, net of taxes, of $15.3 million, which was comprised of the following corresponding adjustments to life and annuity benefits and deferred tax liabilities.

(dollars in thousands)	January 1, 2021
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities	$	119,548
Apply updated discount rate to the liability for future policyholder benefits	(138,865)
Increase in life and annuity benefits	(19,317)
Decrease in deferred tax liability	4,057
Decrease in accumulated other comprehensive income, net of taxes	$	(15,260)

The impact of changes in the discount rate on the liability for future policyholder benefits following the transition date are included in other comprehensive income (loss) in the respective periods and, combined with the transition adjustment, resulted in the following cumulative changes to the Company's previously presented consolidated balance sheets.

	December 31,
(dollars in thousands)	2022		2021
Decrease (increase) in life and annuity benefits	$	113,396	$	(19,759)
Decrease (increase) in deferred tax liability	(23,813)		4,149
Increase (decrease) in accumulated other comprehensive income (loss), net of taxes	$	89,583	$	(15,610)

Changes in the discount rate on the liability for future policyholder benefits also resulted in an increase, or benefit, of $25.2 million and $104.5 million to the other comprehensive loss previously presented for the quarter and nine months ended September 30, 2022, which was comprised of the following adjustments.

(dollars in thousands)	Quarter Ended September 30, 2022		Nine Months Ended September 30, 2022
Reverse benefit included in change in net unrealized gains (losses) on available-for-sale-investments, net of taxes, related to reversal of previously recognized reserve deficiency adjustment	$	—	$	(44,682)
Change in discount rate for life and annuity benefits, net of taxes	25,244		149,135
Increase in other comprehensive loss, net of taxes	$	25,244	$	104,453

The adoption of other provisions of this ASU did not have a material impact on the Company's financial position, results of operations or cash flows for any of the periods presented.

Effective January 1, 2023, the Company adopted ASU No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. ASU No. 2021-08 requires contract assets and liabilities accounted for under FASB Accounting Standards Codification (ASC) 606, Revenue from Contracts with Customers, to be recorded at the acquisition date as if the acquirer entered into those contracts itself on the contract inception dates, rather than at fair value. At adoption, ASU No. 2021-08 did not impact the Company's financial position, results of operations or cash flows, but prospectively, this ASU will impact amounts recorded by the Company for assets acquired and liabilities assumed in conjunction with certain acquisitions.

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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Jan. 01, 2021

Sep. 30, 2023

Accounting Policies [Abstract]

Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Transition Date [Table Text Block]

At the transition date, the adoption of ASU 2018-12 had no impact on retained earnings but resulted in a decrease to accumulated other comprehensive income, net of taxes, of $15.3 million, which was comprised of the following corresponding adjustments to life and annuity benefits and deferred tax liabilities.

(dollars in thousands)	January 1, 2021
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities	$	119,548
Apply updated discount rate to the liability for future policyholder benefits	(138,865)
Increase in life and annuity benefits	(19,317)
Decrease in deferred tax liability	4,057
Decrease in accumulated other comprehensive income, net of taxes	$	(15,260)

Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Previously Presented Balance Sheets [Table Text Block]

The impact of changes in the discount rate on the liability for future policyholder benefits following the transition date are included in other comprehensive income (loss) in the respective periods and, combined with the transition adjustment, resulted in the following cumulative changes to the Company's previously presented consolidated balance sheets.

	December 31,
(dollars in thousands)	2022		2021
Decrease (increase) in life and annuity benefits	$	113,396	$	(19,759)
Decrease (increase) in deferred tax liability	(23,813)		4,149
Increase (decrease) in accumulated other comprehensive income (loss), net of taxes	$	89,583	$	(15,610)

Reconciliation of Impact of Adopting ASU 2018-12 on OCI, Prior Period [Table Text Block]

Changes in the discount rate on the liability for future policyholder benefits also resulted in an increase, or benefit, of $25.2 million and $104.5 million to the other comprehensive loss previously presented for the quarter and nine months ended September 30, 2022, which was comprised of the following adjustments.

(dollars in thousands)	Quarter Ended September 30, 2022		Nine Months Ended September 30, 2022
Reverse benefit included in change in net unrealized gains (losses) on available-for-sale-investments, net of taxes, related to reversal of previously recognized reserve deficiency adjustment	$	—	$	(44,682)
Change in discount rate for life and annuity benefits, net of taxes	25,244		149,135
Increase in other comprehensive loss, net of taxes	$	25,244	$	104,453

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Segment Reporting Disclosures (Tables)

9 Months Ended

Sep. 30, 2023

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

Company's Segment Disclosures

The following tables summarize the Company's segment disclosures.

	Quarter Ended September 30, 2023
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	1,848,267	$	274,161	$	—	$	—	$	(683)	$	2,121,745
Net investment income	—		—		191,015		1,192		—		192,207
Net investment losses	—		—		(265,917)		—		—		(265,917)
Products revenues	—		—		—		601,524		—		601,524
Services and other revenues	—		—		(5,033)		644,053		86,607		725,627
Total operating revenues	1,848,267		274,161		(79,935)		1,246,769		85,924		3,375,186
Losses and loss adjustment expenses:
Current accident year	(1,258,864)		(176,007)		—		—		—		(1,434,871)
Prior accident years	55,374		(23,262)		—		—		(1,566)		30,546
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(369,001)		(68,919)		—		—		—		(437,920)
Other underwriting expenses	(250,684)		(11,785)		—		—		2,260		(260,209)
Products expenses	—		—		—		(545,567)		—		(545,567)
Services and other expenses	—		—		—		(570,782)		(36,028)		(606,810)
Amortization of intangible assets (2)	—		—		—		(23,118)		(24,427)		(47,545)
Segment profit (loss)	$	25,092	$	(5,812)	$	(79,935)	$	107,302	$	26,163	$	72,810
Interest expense											(44,553)
Net foreign exchange gains											39,246
Income before income taxes											$	67,503

(1)    Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)    Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.1 million for the quarter ended September 30, 2023.

	Quarter Ended September 30, 2022
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	1,695,029	$	260,535	$	—	$	—	$	1,266	$	1,956,830
Net investment income	—		—		112,297		317		—		112,614
Net investment losses	—		—		(281,483)		—		—		(281,483)
Products revenues	—		—		—		586,531		—		586,531
Services and other revenues	—		—		(4,883)		629,215		67,321		691,653
Total operating revenues	1,695,029		260,535		(174,069)		1,216,063		68,587		3,066,145
Losses and loss adjustment expenses:
Current accident year	(1,100,511)		(166,485)		—		—		—		(1,266,996)
Prior accident years	53,760		29,505		—		—		(1,582)		81,683
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(362,137)		(68,662)		—		—		(383)		(431,182)
Other underwriting expenses	(200,604)		(11,638)		—		—		152		(212,090)
Products expenses	—		—		—		(580,830)		—		(580,830)
Services and other expenses	—		—		—		(556,207)		9,823		(546,384)
Amortization of intangible assets (2)	—		—		—		(18,567)		(24,851)		(43,418)
Segment profit (loss)	$	85,537	$	43,255	$	(174,069)	$	60,459	$	51,746	$	66,928
Interest expense											(47,348)
Net foreign exchange gains											113,635
Income before income taxes											$	133,215

(1)     Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)     Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.6 million for the quarter ended September 30, 2022.

	Nine Months Ended September 30, 2023
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	5,322,377	$	799,683	$	—	$	—	$	(1,468)	$	6,120,592
Net investment income	—		—		518,536		2,699		—		521,235
Net investment gains	—		—		591,173		—		—		591,173
Products revenues	—		—		—		1,964,332		—		1,964,332
Services and other revenues	—		—		(13,791)		1,770,997		206,573		1,963,779
Total operating revenues	5,322,377		799,683		1,095,918		3,738,028		205,105		11,161,111
Losses and loss adjustment expenses:
Current accident year	(3,415,860)		(519,109)		—		—		—		(3,934,969)
Prior accident years	179,564		(6,584)		—		—		(3,226)		169,754
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(1,096,500)		(202,271)		—		—		—		(1,298,771)
Other underwriting expenses	(733,334)		(38,113)		—		—		(1,503)		(772,950)
Products expenses	—		—		—		(1,712,792)		—		(1,712,792)
Services and other expenses	—		—		—		(1,632,588)		(45,658)		(1,678,246)
Amortization of intangible assets (2)	—		—		—		(62,528)		(73,839)		(136,367)
Segment profit	$	256,247	$	33,606	$	1,095,918	$	330,120	$	80,879	$	1,796,770
Interest expense											(141,212)
Net foreign exchange losses											(8,658)
Income before income taxes											$	1,646,900

(1)    Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)    Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $28.0 million for the nine months ended September 30, 2023.

	Nine Months Ended September 30, 2022
(dollars in thousands)	Insurance		Reinsurance		Investing		Markel Ventures		Other (1)		Consolidated
Earned premiums	$	4,742,178	$	808,656	$	—	$	—	$	(1,130)	$	5,549,704
Net investment income	—		—		301,289		424		—		301,713
Net investment losses	—		—		(2,194,525)		—		—		(2,194,525)
Products revenues	—		—		—		1,845,111		—		1,845,111
Services and other revenues	—		—		(27,590)		1,682,318		307,857		1,962,585
Total operating revenues	4,742,178		808,656		(1,920,826)		3,527,853		306,727		7,464,588
Losses and loss adjustment expenses:
Current accident year	(2,906,031)		(514,875)		—		—		—		(3,420,906)
Prior accident years	196,093		13,845		—		—		(5,527)		204,411
Underwriting, acquisition and insurance expenses:
Amortization of policy acquisition costs	(996,369)		(209,541)		—		—		(415)		(1,206,325)
Other underwriting expenses	(596,426)		(37,708)		—		—		(2,647)		(636,781)
Products expenses	—		—		—		(1,726,367)		—		(1,726,367)
Services and other expenses	—		—		—		(1,524,167)		(169,589)		(1,693,756)
Amortization of intangible assets (2)	—		—		—		(60,077)		(74,913)		(134,990)
Segment profit (loss)	$	439,445	$	60,377	$	(1,920,826)	$	217,242	$	53,636	$	(1,150,126)
Interest expense											(147,090)
Net foreign exchange gains											241,706
Loss before income taxes											$	(1,055,510)

(1)     Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

(2)     Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $29.0 million for the nine months ended September 30, 2022.

Summary of Additional Measures for Markel Ventures

The following amounts attributable to the Markel Ventures segment are also reviewed, or included in measures reviewed, by the Company's chief operating decision maker.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Depreciation expense	$	26,857	$	23,738	$	81,639	$	75,304
Interest expense (1)	$	10,663	$	11,921	$	36,485	$	34,124
Income tax expense	$	22,253	$	12,603	$	66,022	$	43,682
Capital expenditures	$	65,616	$	48,294	$	135,159	$	144,974

(1)    Interest expense for the quarter and nine months ended September 30, 2023 included intercompany interest expense of $6.6 million and $19.9 million, respectively. Interest expense for the quarter and nine months ended September 30, 2022 included intercompany interest expense of $6.6 million and $20.7 million, respectively. Intercompany interest expense was eliminated in consolidation.

Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets

The following table reconciles segment assets to the Company's consolidated balance sheets.

(dollars in thousands)	September 30, 2023		December 31, 2022
Segment assets:
Investing	$	28,522,052	$	26,982,280
Underwriting	9,884,553		8,853,559
Markel Ventures	5,444,105		5,315,677
Total segment assets	43,850,710		41,151,516
Other operations	8,898,006		8,639,743
Total assets	$	52,748,716	$	49,791,259

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Investments (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2023

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Available-For-Sale Investments

The following tables summarize the Company's available-for-sale investments. Commercial and residential mortgage-backed securities include securities issued by U.S. government-sponsored enterprises and U.S. government agencies. The net unrealized holding gains (losses) in the tables below are presented before taxes.

	September 30, 2023
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Fixed maturity securities:
U.S. Treasury securities	$	3,440,991	$	—	$	(130,162)	$	3,310,829
U.S. government-sponsored enterprises	1,133,417		—		(137,733)		995,684
Obligations of states, municipalities and political subdivisions	4,106,251		879		(308,184)		3,798,946
Foreign governments	1,749,621		2,626		(189,128)		1,563,119
Commercial mortgage-backed securities	2,297,828		11		(208,466)		2,089,373
Residential mortgage-backed securities	511,525		1		(32,686)		478,840
Asset-backed securities	1,226		—		(28)		1,198
Corporate bonds	826,883		758		(114,351)		713,290
Total fixed maturity securities	14,067,742		4,275		(1,120,738)		12,951,279
Short-term investments	2,250,219		3,253		(746)		2,252,726
Investments, available-for-sale	$	16,317,961	$	7,528	$	(1,121,484)	$	15,204,005

	December 31, 2022
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Fixed maturity securities:
U.S. Treasury securities	$	3,050,089	$	2,363	$	(138,493)	$	2,913,959
U.S. government-sponsored enterprises	871,463		154		(106,079)		765,538
Obligations of states, municipalities and political subdivisions	3,973,911		6,503		(247,231)		3,733,183
Foreign governments	1,473,658		2,843		(169,723)		1,306,778
Commercial mortgage-backed securities	2,109,721		395		(169,668)		1,940,448
Residential mortgage-backed securities	553,591		6		(26,804)		526,793
Asset-backed securities	1,693		—		(53)		1,640
Corporate bonds	771,761		836		(104,101)		668,496
Total fixed maturity securities	12,805,887		13,100		(962,152)		11,856,835
Short-term investments	2,663,560		5,760		(58)		2,669,262
Investments, available-for-sale	$	15,469,447	$	18,860	$	(962,210)	$	14,526,097

Summary Of Gross Unrealized Investment Losses By Length Of Time That Securities Have Continuously Been In An Unrealized Loss Position

The following tables summarize gross unrealized investment losses on available-for-sale investments by the length of time that securities have continuously been in an unrealized loss position.

	September 30, 2023
	Less than 12 months				12 months or longer				Total
(dollars in thousands)	Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Losses
Fixed maturity securities:
U.S. Treasury securities	$	1,339,577	$	(33,496)	$	1,971,252	$	(96,666)	$	3,310,829	$	(130,162)
U.S. government-sponsored enterprises	302,362		(13,784)		693,322		(123,949)		995,684		(137,733)
Obligations of states, municipalities and political subdivisions	1,469,105		(36,622)		2,240,788		(271,562)		3,709,893		(308,184)
Foreign governments	442,453		(18,214)		1,095,516		(170,914)		1,537,969		(189,128)
Commercial mortgage-backed securities	321,255		(13,554)		1,764,367		(194,912)		2,085,622		(208,466)
Residential mortgage-backed securities	45,081		(1,074)		433,695		(31,612)		478,776		(32,686)
Asset-backed securities	—		—		1,198		(28)		1,198		(28)
Corporate bonds	98,459		(2,890)		605,598		(111,461)		704,057		(114,351)
Total fixed maturity securities	4,018,292		(119,634)		8,805,736		(1,001,104)		12,824,028		(1,120,738)
Short-term investments	203,710		(746)		—		—		203,710		(746)
Total	$	4,222,002	$	(120,380)	$	8,805,736	$	(1,001,104)	$	13,027,738	$	(1,121,484)

	December 31, 2022
	Less than 12 months				12 months or longer				Total
(dollars in thousands)	Estimated Fair Value		Gross Unrealized Holding  Losses		Estimated Fair Value		Gross Unrealized Holding  Losses		Estimated Fair Value		Gross Unrealized Holding  Losses
Fixed maturity securities:
U.S. Treasury securities	$	735,605	$	(30,583)	$	1,907,922	$	(107,910)	$	2,643,527	$	(138,493)
U.S. government-sponsored enterprises	413,495		(40,488)		331,391		(65,591)		744,886		(106,079)
Obligations of states, municipalities and political subdivisions	2,474,289		(164,537)		348,943		(82,694)		2,823,232		(247,231)
Foreign governments	900,322		(115,324)		300,423		(54,399)		1,200,745		(169,723)
Commercial mortgage-backed securities	1,611,603		(117,482)		305,217		(52,186)		1,916,820		(169,668)
Residential mortgage-backed securities	516,423		(25,232)		9,342		(1,572)		525,765		(26,804)
Asset-backed securities	1,640		(53)		—		—		1,640		(53)
Corporate bonds	496,766		(74,542)		153,035		(29,559)		649,801		(104,101)
Total fixed maturity securities	7,150,143		(568,241)		3,356,273		(393,911)		10,506,416		(962,152)
Short-term investments	774,480		(58)		—		—		774,480		(58)
Total	$	7,924,623	$	(568,299)	$	3,356,273	$	(393,911)	$	11,280,896	$	(962,210)

Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date

The amortized cost and estimated fair value of fixed maturity securities at September 30, 2023 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,245,195	$	1,221,058
Due after one year through five years	4,731,573		4,490,492
Due after five years through ten years	3,655,839		3,269,429
Due after ten years	1,624,556		1,400,889
	11,257,163		10,381,868
Commercial mortgage-backed securities	2,297,828		2,089,373
Residential mortgage-backed securities	511,525		478,840
Asset-backed securities	1,226		1,198
Total fixed maturity securities	$	14,067,742	$	12,951,279

Components Of Net Investment Income

The following table presents the components of net investment income.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Interest:
Fixed maturity securities	$	98,891	$	72,477	$	269,438	$	215,541
Short-term investments	26,768		10,316		77,099		14,644
Cash and cash equivalents and restricted cash and cash equivalents	39,473		7,794		102,565		9,619
Dividends on equity securities	31,134		25,962		84,968		74,289
	196,266		116,549		534,070		314,093
Investment expenses	(4,059)		(3,935)		(12,835)		(12,380)
Net investment income	$	192,207	$	112,614	$	521,235	$	301,713

Summary Of Net Investment Gains (Losses) And The Change In Net Unrealized Gains On Available-For-Sale Investments

The following table presents the components of net investment gains (losses) included in net income (loss) and the change in net unrealized gains (losses) included in other comprehensive loss. Gross realized investment gains and losses on fixed maturity securities, short-term investments and other investments were not material to the consolidated financial statements and are presented on a net basis in the following table.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Fixed maturity securities, short-term investments and other investments:
Net realized investment gains (losses)	$	(36,093)	$	2,032	$	(38,159)	$	6,001
Equity securities:
Change in fair value of securities sold during the period	2,683		2,553		16,706		(29,015)
Change in fair value of securities held at the end of the period	(232,507)		(286,068)		612,626		(2,171,511)
Total change in fair value	(229,824)		(283,515)		629,332		(2,200,526)
Net investment gains (losses)	$	(265,917)	$	(281,483)	$	591,173	$	(2,194,525)
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive loss:
Fixed maturity securities	$	(208,598)	$	(530,161)	$	(167,411)	$	(1,645,060)
Short-term investments	193		(8,186)		(3,195)		(11,563)
Net decrease	$	(208,405)	$	(538,347)	$	(170,606)	$	(1,656,623)

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Balances Of Assets Measured At Fair Value On A Recurring Basis

The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.

	September 30, 2023
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments:
Fixed maturity securities, available-for-sale:
U.S. Treasury securities	$	—	$	3,310,829	$	—	$	3,310,829
U.S. government-sponsored enterprises	—		995,684		—		995,684
Obligations of states, municipalities and political subdivisions	—		3,798,946		—		3,798,946
Foreign governments	—		1,563,119		—		1,563,119
Commercial mortgage-backed securities	—		2,089,373		—		2,089,373
Residential mortgage-backed securities	—		478,840		—		478,840
Asset-backed securities	—		1,198		—		1,198
Corporate bonds	—		713,290		—		713,290
Total fixed maturity securities, available-for-sale	—		12,951,279		—		12,951,279
Equity securities:
Insurance, banks and other financial institutions	3,304,299		—		942		3,305,241
Industrial, consumer and all other	5,269,716		—		—		5,269,716
Total equity securities	8,574,015		—		942		8,574,957
Short-term investments, available-for-sale	2,085,072		167,654		—		2,252,726
Total investments	$	10,659,087	$	13,118,933	$	942	$	23,778,962

	December 31, 2022
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments:
Fixed maturity securities, available-for-sale:
U.S. Treasury securities	$	—	$	2,913,959	$	—	$	2,913,959
U.S. government-sponsored enterprises	—		765,538		—		765,538
Obligations of states, municipalities and political subdivisions	—		3,733,183		—		3,733,183
Foreign governments	—		1,306,778		—		1,306,778
Commercial mortgage-backed securities	—		1,940,448		—		1,940,448
Residential mortgage-backed securities	—		526,793		—		526,793
Asset-backed securities	—		1,640		—		1,640
Corporate bonds	—		668,496		—		668,496
Total fixed maturity securities, available-for-sale	—		11,856,835		—		11,856,835
Equity securities:
Insurance, banks and other financial institutions	2,952,689		—		899		2,953,588
Industrial, consumer and all other	4,718,324		—		—		4,718,324
Total equity securities	7,671,013		—		899		7,671,912
Short-term investments, available-for-sale	2,510,164		159,098		—		2,669,262
Total investments	$	10,181,177	$	12,015,933	$	899	$	22,198,009

Summary Of Changes In Level 3 Investments Measured At Fair Value On A Recurring Basis

The following table summarizes changes in Level 3 investments measured at fair value on a recurring basis.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Equity securities, beginning of period	$	936	$	4,380	$	899	$	56,472
Purchases	—		—		—		—
Sales	—		(3,528)		—		(56,335)
Net investment gains	6		69		43		784
Equity securities, end of period	$	942	$	921	$	942	$	921

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Products, Services and Other Revenues (Tables)

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Schedule Of Revenues From Contracts With Customers By Type

The following tables present revenues from contracts with customers by type, all of which are included in products revenues and services and other revenues in the consolidated statements of income (loss) and comprehensive income (loss), along with a reconciliation to total products revenues and services and other revenues.

	Quarter Ended September 30,
	2023						2022
(dollars in thousands)	Markel Ventures		Other		Total		Markel Ventures		Other		Total
Products	$	585,707	$	—	$	585,707	$	575,277	$	—	$	575,277
Services	597,512		2,904		600,416		594,717		11,529		606,246
Investment management	—		44,204		44,204		—		15,641		15,641
Total revenues from contracts with customers	1,183,219		47,108		1,230,327		1,169,994		27,170		1,197,164
Program services and other fronting	—		39,499		39,499		—		40,033		40,033
Equity method investments income (loss)	(21)		4,264		4,243		(546)		(6,555)		(7,101)
Other	62,379		(9,297)		53,082		46,298		1,790		48,088
Total	$	1,245,577	$	81,574	$	1,327,151	$	1,215,746	$	62,438	$	1,278,184

	Nine Months Ended September 30,
	2023						2022
(dollars in thousands)	Markel Ventures		Other		Total		Markel Ventures		Other		Total
Products	$	1,921,773	$	—	$	1,921,773	$	1,809,276	$	—	$	1,809,276
Services	1,652,187		7,542		1,659,729		1,593,946		41,547		1,635,493
Investment management	—		76,108		76,108		—		55,197		55,197
Total revenues from contracts with customers	3,573,960		83,650		3,657,610		3,403,222		96,744		3,499,966
Program services and other fronting	—		105,952		105,952		—		103,096		103,096
Disposition gain	—		16,923		16,923		—		107,293		107,293
Equity method investments income (loss)	1,087		(1,485)		(398)		1,537		(37,639)		(36,102)
Other	160,282		(12,258)		148,024		122,670		10,773		133,443
Total	$	3,735,329	$	192,782	$	3,928,111	$	3,527,429	$	280,267	$	3,807,696

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Unpaid Losses And Loss Adjustment Expenses (Tables)

9 Months Ended

Sep. 30, 2023

Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]

Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses

The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses.

	Nine Months Ended September 30,
(dollars in thousands)	2023		2022
Gross reserves for losses and loss adjustment expenses, beginning of year	$	20,947,898	$	18,178,894
Reinsurance recoverables on unpaid losses, beginning of year	7,994,884		6,876,317
Net reserves for losses and loss adjustment expenses, beginning of year	12,953,014		11,302,577
Effect of foreign currency rate changes on beginning of year balance	16,246		(275,364)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year	12,969,260		11,027,213
Incurred losses and loss adjustment expenses:
Current accident year	3,934,969		3,420,906
Prior accident years	(169,754)		(204,411)
Total incurred losses and loss adjustment expenses	3,765,215		3,216,495
Payments:
Current accident year	419,998		350,684
Prior accident years	2,018,199		1,880,471
Total payments	2,438,197		2,231,155
Effect of foreign currency rate changes on current year activity	416		(7,499)
Change in net reserves for losses and loss adjustment expenses of Markel CATCo Re (see note 11)	(146,895)		375,222
Reinsurance recoverable for retroactive reinsurance transaction	(125,067)		—
Net reserves for losses and loss adjustment expenses, end of period	14,024,732		12,380,276
Reinsurance recoverables on unpaid losses	8,119,634		7,814,098
Gross reserves for losses and loss adjustment expenses, end of period	$	22,144,366	$	20,194,374

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Reinsurance (Tables)

9 Months Ended

Sep. 30, 2023

Reinsurance Disclosures [Abstract]

Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned

The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Quarter Ended September 30,
	2023								2022
(dollars in thousands)	Direct		Assumed		Ceded		Net Premiums		Direct		Assumed		Ceded		Net Premiums
Underwriting:
Written	$	2,223,988	$	282,070	$	(478,035)	$	2,028,023	$	2,133,822	$	349,650	$	(473,885)	$	2,009,587
Earned	$	2,127,244	$	424,620	$	(429,901)	$	2,121,963	$	1,899,816	$	408,561	$	(351,118)	$	1,957,259
Program services and other fronting:
Written	615,424		557,324		(1,172,966)		(218)		663,631		327,668		(991,719)		(420)
Earned	669,544		313,079		(982,841)		(218)		729,312		218,439		(948,180)		(429)
Consolidated:
Written	$	2,839,412	$	839,394	$	(1,651,001)	$	2,027,805	$	2,797,453	$	677,318	$	(1,465,604)	$	2,009,167
Earned	$	2,796,788	$	737,699	$	(1,412,742)	$	2,121,745	$	2,629,128	$	627,000	$	(1,299,298)	$	1,956,830

	Nine Months Ended September 30,
	2023								2022
(dollars in thousands)	Direct		Assumed		Ceded		Net Premiums		Direct		Assumed		Ceded		Net Premiums
Underwriting:
Written	$	6,479,090	$	1,419,802	$	(1,444,626)	$	6,454,266	$	6,065,936	$	1,466,036	$	(1,255,226)	$	6,276,746
Earned	$	6,124,444	$	1,247,743	$	(1,250,605)	$	6,121,582	$	5,370,481	$	1,194,504	$	(1,012,485)	$	5,552,500
Program services and other fronting:
Written	2,012,806		991,305		(3,005,101)		(990)		2,025,195		595,940		(2,624,185)		(3,050)
Earned	1,960,219		546,871		(2,508,080)		(990)		2,036,016		332,415		(2,371,227)		(2,796)
Consolidated:
Written	$	8,491,896	$	2,411,107	$	(4,449,727)	$	6,453,276	$	8,091,131	$	2,061,976	$	(3,879,411)	$	6,273,696
Earned	$	8,084,663	$	1,794,614	$	(3,758,685)	$	6,120,592	$	7,406,497	$	1,526,919	$	(3,383,712)	$	5,549,704

Effect Of Reinsurance And Retrocessional Reinsurance On Losses and Loss Adjustment Expenses

The following table summarizes the effect of reinsurance and retrocessional reinsurance on losses and loss adjustment expenses in the Company's underwriting operations.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Gross losses and loss adjustment expenses	$	1,684,389	$	1,423,526	$	4,552,926	$	3,760,566
Ceded losses and loss adjustment expenses	(278,945)		(238,220)		(786,876)		(544,109)
Net losses and loss adjustment expenses	$	1,405,444	$	1,185,306	$	3,766,050	$	3,216,457

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Life and Annuity Benefits (Tables)

9 Months Ended

Sep. 30, 2023

Liability for Future Policy Benefit, before Reinsurance [Abstract]

Schedule of Future Policyholder Benefits, Life and Annuity [Table Text Block]

The following table presents the components of the Company's liabilities for life and annuity benefits.

(dollars in thousands)	September 30, 2023		December 31, 2022
Liability for future policyholder benefits	$	508,436	$	554,366
Deferred profit liability	52,034		48,569
Other	39,786		47,786
Total	$	600,256	$	650,721

Liability for Future Policy Benefit, Activity [Table Text Block]

The following table presents a rollforward of the present value of the liability for future policyholder benefits.

	Nine Months Ended September 30,
(dollars in thousands)	2023		2022
Liability for future policyholder benefits, beginning of year	$	554,366	$	821,632
Liability for future policyholder benefits at original discount rate, beginning of year	667,761		745,313
Effect of changes in cash flow assumptions	—		—
Effect of actual variances from expected experience	(5,890)		(3,859)
Adjusted liability for future policyholder benefits, beginning of year	661,871		741,454
Interest accretion	11,251		11,909
Benefit payments	(39,819)		(40,643)
Effect of foreign currency rate changes	(356)		(77,166)
Liability for future policyholder benefits at original discount rate, end of period	632,947		635,554
Cumulative effect of changes in discount rate assumptions	(124,511)		(112,459)
Liability for future policyholder benefits, end of period (1)	$	508,436	$	523,095

(1)    The undiscounted liability for future policyholder benefits was $813.6 million and $822.3 million as of September 30, 2023 and 2022, respectively.

Schedule of Additional Details of Liability for Future Policyholder Benefits, Life and Annuity [Table Text Block]

The following table summarizes additional details for the Company's liability for future policyholder benefits.

	September 30, 2023		December 31, 2022
Weighted-average interest rate:
Interest accretion rate	2.3	%	2.3	%
Current discount rate	4.7	%	4.3	%
Weighted-average liability duration	8.2 years		8.6 years

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Variable Interest Entities (Tables)

9 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Amounts attributable to Markel CATCo Re in Markel's consolidated balance sheet

The Company's consolidated balance sheets include the following amounts attributable to Markel CATCo Re.

(dollars in thousands)	September 30, 2023		December 31, 2022
Assets
Cash and cash equivalents	$	70,852	$	104,443
Restricted cash and cash equivalents	193,778		317,577
Other assets and receivables due from cedents	19,416		41,357
Total Assets	$	284,046	$	463,377
Liabilities and Equity
Unpaid losses and loss adjustment expenses	$	201,026	$	347,921
Other liabilities	1,232		26,717
Total Liabilities	202,258		374,638
Shareholders' equity	21,139		21,139
Noncontrolling interests	60,649		67,600
Total Equity	81,788		88,739
Total Liabilities and Equity	$	284,046	$	463,377

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Related Party Disclosures (Tables)

9 Months Ended

Sep. 30, 2023

Related Party Transactions [Abstract]

Nephila Related Party

Through the Company's program services and other fronting operations, as well as its underwriting operations, the Company has programs with Nephila through which the Company writes insurance policies that are either partially or fully ceded to Nephila Reinsurers. Through these programs, Nephila utilizes certain of the Company's licensed insurance companies to write U.S. catastrophe-exposed property risk that is then ceded to Nephila Reinsurers. A portion of this business is placed by Velocity, which the Company retained a minority interest in following its disposition. Additionally, through the Company's insurance underwriting operations, the Company has a quota share agreement with Nephila through which it cedes a portion of its property business to Nephila Reinsurers. The following table summarizes the premiums ceded to Nephila Reinsurers.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Program services and other fronting:
Gross and ceded written premiums attributable to Nephila programs	$	501,838	$	398,872	$	1,036,126	$	889,644
Underwriting:
Premiums ceded to Nephila Reinsurers	$	10,058	$	15,037	$	39,905	$	44,656

Hagarty Related Party

The Company holds a minority ownership interest in Hagerty, which operates primarily as a managing general agent and also includes Hagerty Reinsurance Limited (Hagerty Re), a Bermuda Class 3 reinsurance company. Through the Company's underwriting operations, the Company underwrites insurance for Hagerty, a portion of which is ceded to Hagerty Re. The amounts attributed to these arrangements are summarized in the following table.

	Quarter Ended September 30,				Nine Months Ended September 30,
(dollars in thousands)	2023		2022		2023		2022
Gross written premiums attributable to Hagerty	$	227,693	$	197,041	$	628,889	$	540,447
Premiums ceded to Hagerty Re	$	174,455	$	130,430	$	480,924	$	357,729

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Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2023

Stockholders' Equity Note [Abstract]

Schedule of Common Stock Outstanding Roll Forward

The Company has 50,000,000 shares of no par value common stock authorized. The following table presents a rollforward of changes in common shares issued and outstanding.

	Quarter Ended September 30,		Nine Months Ended September 30,
(shares in ones)	2023	2022	2023	2022
Issued and outstanding common shares, beginning of period	13,284,998	13,537,895	13,422,692	13,631,740
Issuance of common shares	3,007	694	5,475	2,886
Repurchase of common shares	(56,483)	(67,696)	(196,645)	(163,733)
Issued and outstanding common shares, end of period	13,231,522	13,470,893	13,231,522	13,470,893

Schedule Of Net Income (Loss) Per Common Share

The following table presents net income (loss) per common share and diluted net income (loss) per common share.

	Quarter Ended September 30,				Nine Months Ended September 30,
(in thousands, except per share amounts)	2023		2022		2023		2022
Net income (loss) to common shareholders	$	42,591	$	59,594	$	1,208,754	$	(925,943)
Adjustment of redeemable noncontrolling interests	(628)		(17,730)		7,087		(62,168)
Adjusted net income (loss) to common shareholders	$	41,963	$	41,864	$	1,215,841	$	(988,111)
Basic common shares outstanding	13,315		13,564		13,382		13,609
Dilutive potential common shares from restricted stock units and restricted stock (1)	30		31		24		—
Diluted common shares outstanding	13,345		13,595		13,406		13,609
Basic net income (loss) per common share	$	3.15	$	3.09	$	90.86	$	(72.61)
Diluted net income (loss) per common share (1)	$	3.14	$	3.08	$	90.69	$	(72.61)

(1)     The impact of 28 thousand shares from restricted stock units and restricted stock was excluded from the computation of diluted net loss per common share for the nine months ended September 30, 2022 because the effect would have been anti-dilutive.

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Summary Of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Transition Date) (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jan. 01, 2021
Accounting Policies [Abstract]
Accumulated other comprehensive income (loss), net of tax	$ (890,833,000)	$ (767,494,000)
Cumulative effect of changes in discount rate assumptions	(124,511,000)		$ (112,459,000)
Life and annuity benefits	600,256,000	650,721,000
Retained earnings	10,778,567,000	9,832,804,000
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	10,778,567,000	9,832,804,000
Cumulative effect of changes in discount rate assumptions	(124,511,000)		$ (112,459,000)
Life and annuity benefits	600,256,000	650,721,000
Accumulated other comprehensive income (loss), net of tax	$ (890,833,000)	$ (767,494,000)
Effect of Modified Retrospective Application Accounting Standards Update 2018-12
Accounting Policies [Abstract]
Accumulated other comprehensive income (loss), net of tax				$ (15,260,000)
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities				119,548,000
Cumulative effect of changes in discount rate assumptions				(138,865,000)
Life and annuity benefits				(19,317,000)
Deferred tax liabilities, net				4,057,000
Retained earnings				0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings				0
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities				119,548,000
Cumulative effect of changes in discount rate assumptions				(138,865,000)
Life and annuity benefits				(19,317,000)
Deferred tax liabilities, net				4,057,000
Accumulated other comprehensive income (loss), net of tax				$ (15,260,000)

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Summary of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Previously Presented Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Life and annuity benefits	$ 600,256	$ 650,721
Accumulated other comprehensive income (loss), net of tax	(890,833)	(767,494)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Life and annuity benefits	600,256	650,721
Accumulated other comprehensive loss	$ (890,833)	(767,494)
Effect of Modified Retrospective Application Accounting Standards Update 2018-12
Accounting Policies [Abstract]
Life and annuity benefits		113,396	$ (19,759)
Deferred tax liabilities, net		(23,813)	4,149
Accumulated other comprehensive income (loss), net of tax		89,583	(15,610)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Life and annuity benefits		113,396	(19,759)
Deferred tax liabilities, net		(23,813)	4,149
Accumulated other comprehensive loss		$ 89,583	$ (15,610)

XML

Summary of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on OCI, Prior Period) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounting Policies [Abstract]
Other Comprehensive Income (Loss), Net of Tax	$ (150,019)	$ (407,663)	$ (123,257)	$ (1,169,684)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Comprehensive Income (Loss), Net of Tax	$ (150,019)	(407,663)	$ (123,257)	(1,169,684)
Effect of Modified Retrospective Application Accounting Standards Update 2018-12
Accounting Policies [Abstract]
Reverse benefit included in change in net unrealized gains (losses) on available-for-sale-investments, net of taxes, related to reversal of previously recognized reserve deficiency adjustment		0		(44,682)
Change in discount rate for life and annuity benefits, net of taxes		25,244		149,135
Other Comprehensive Income (Loss), Net of Tax		25,244		104,453
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reverse benefit included in change in net unrealized gains (losses) on available-for-sale-investments, net of taxes, related to reversal of previously recognized reserve deficiency adjustment		0		(44,682)
Change in discount rate for life and annuity benefits, net of taxes		25,244		149,135
Other Comprehensive Income (Loss), Net of Tax		$ 25,244		$ 104,453

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Segment Reporting Disclosures (Company's Segment Disclosures) (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Segment Reporting Information [Line Items]
Earned premiums		$ 2,121,745		$ 1,956,830		$ 6,120,592		$ 5,549,704
Net investment income		192,207		112,614		521,235		301,713
Net investment gains (losses)		(265,917)		(281,483)		591,173		(2,194,525)
Products revenues		601,524		586,531		1,964,332		1,845,111
Services and other revenues		725,627		691,653		1,963,779		1,962,585
Operating revenues		3,375,186		3,066,145		11,161,111		7,464,588
Losses and loss adjustment expenses, current accident year		(1,434,871)		(1,266,996)		(3,934,969)		(3,420,906)
Losses and loss adjustment expenses, prior accident year		30,546		81,683		169,754		204,411
Amortization of policy acquisition costs		(437,920)		(431,182)		(1,298,771)		(1,206,325)
Other underwriting expenses		(260,209)		(212,090)		(772,950)		(636,781)
Products expenses		(545,567)		(580,830)		(1,712,792)		(1,726,367)
Services and other expenses		(606,810)		(546,384)		(1,678,246)		(1,693,756)
Amortization of intangible assets		(47,545)	[1]	(43,418)	[2]	(136,367)	[3]	(134,990)	[4]
Segment profit (loss)		72,810		66,928		1,796,770		(1,150,126)
Interest expense		(44,553)		(47,348)		(141,212)		(147,090)
Net foreign exchange gains (losses)		39,246		113,635		(8,658)		241,706
Income (Loss) before income taxes		67,503		133,215		1,646,900		(1,055,510)
Insurance [Member]
Segment Reporting Information [Line Items]
Earned premiums		1,848,267		1,695,029		5,322,377		4,742,178
Net investment income		0		0		0		0
Net investment gains (losses)		0		0		0		0
Products revenues		0		0		0		0
Services and other revenues		0		0		0		0
Operating revenues		1,848,267		1,695,029		5,322,377		4,742,178
Losses and loss adjustment expenses, current accident year		(1,258,864)		(1,100,511)		(3,415,860)		(2,906,031)
Losses and loss adjustment expenses, prior accident year		55,374		53,760		179,564		196,093
Amortization of policy acquisition costs		(369,001)		(362,137)		(1,096,500)		(996,369)
Other underwriting expenses		(250,684)		(200,604)		(733,334)		(596,426)
Products expenses		0		0		0		0
Services and other expenses		0		0		0		0
Amortization of intangible assets		0	[1]	0	[2]	0	[3]	0	[4]
Segment profit (loss)		25,092		85,537		256,247		439,445
Reinsurance [Member]
Segment Reporting Information [Line Items]
Earned premiums		274,161		260,535		799,683		808,656
Net investment income		0		0		0		0
Net investment gains (losses)		0		0		0		0
Products revenues		0		0		0		0
Services and other revenues		0		0		0		0
Operating revenues		274,161		260,535		799,683		808,656
Losses and loss adjustment expenses, current accident year		(176,007)		(166,485)		(519,109)		(514,875)
Losses and loss adjustment expenses, prior accident year		(23,262)		29,505		(6,584)		13,845
Amortization of policy acquisition costs		(68,919)		(68,662)		(202,271)		(209,541)
Other underwriting expenses		(11,785)		(11,638)		(38,113)		(37,708)
Products expenses		0		0		0		0
Services and other expenses		0		0		0		0
Amortization of intangible assets		0	[1]	0	[2]	0	[3]	0	[4]
Segment profit (loss)		(5,812)		43,255		33,606		60,377
Investing [Member]
Segment Reporting Information [Line Items]
Earned premiums		0		0		0		0
Net investment income		191,015		112,297		518,536		301,289
Net investment gains (losses)		(265,917)		(281,483)		591,173		(2,194,525)
Products revenues		0		0		0		0
Services and other revenues		(5,033)		(4,883)		(13,791)		(27,590)
Operating revenues		(79,935)		(174,069)		1,095,918		(1,920,826)
Losses and loss adjustment expenses, current accident year		0		0		0		0
Losses and loss adjustment expenses, prior accident year		0		0		0		0
Amortization of policy acquisition costs		0		0		0		0
Other underwriting expenses		0		0		0		0
Products expenses		0		0		0		0
Services and other expenses		0		0		0		0
Amortization of intangible assets		0	[1]	0	[2]	0	[3]	0	[4]
Segment profit (loss)		(79,935)		(174,069)		1,095,918		(1,920,826)
Markel Ventures [Member]
Segment Reporting Information [Line Items]
Earned premiums		0		0		0		0
Net investment income		1,192		317		2,699		424
Net investment gains (losses)		0		0		0		0
Products revenues		601,524		586,531		1,964,332		1,845,111
Services and other revenues		644,053		629,215		1,770,997		1,682,318
Operating revenues		1,246,769		1,216,063		3,738,028		3,527,853
Losses and loss adjustment expenses, current accident year		0		0		0		0
Losses and loss adjustment expenses, prior accident year		0		0		0		0
Amortization of policy acquisition costs		0		0		0		0
Other underwriting expenses		0		0		0		0
Products expenses		(545,567)		(580,830)		(1,712,792)		(1,726,367)
Services and other expenses		(570,782)		(556,207)		(1,632,588)		(1,524,167)
Amortization of intangible assets		(23,118)	[1]	(18,567)	[2]	(62,528)	[3]	(60,077)	[4]
Segment profit (loss)		107,302		60,459		330,120		217,242
Interest expense	[5]	(10,663)		(11,921)		(36,485)		(34,124)
Other [Member]
Segment Reporting Information [Line Items]
Earned premiums		(683)	[6]	1,266	[7]	(1,468)	[8]	(1,130)	[9]
Net investment income		0	[6]	0	[7]	0	[8]	0	[9]
Net investment gains (losses)		0	[6]	0	[7]	0	[8]	0	[9]
Products revenues		0	[6]	0	[7]	0	[8]	0	[9]
Services and other revenues		86,607	[6]	67,321	[7]	206,573	[8]	307,857	[9]
Operating revenues		85,924	[6]	68,587	[7]	205,105	[8]	306,727	[9]
Losses and loss adjustment expenses, current accident year		0	[6]	0	[7]	0	[8]	0	[9]
Losses and loss adjustment expenses, prior accident year		(1,566)	[6]	(1,582)	[7]	(3,226)	[8]	(5,527)	[9]
Amortization of policy acquisition costs		0	[6]	(383)	[7]	0	[8]	(415)	[9]
Other underwriting expenses		2,260	[6]	152	[7]	(1,503)	[8]	(2,647)	[9]
Products expenses		0	[6]	0	[7]	0	[8]	0	[9]
Services and other expenses		(36,028)	[6]	9,823	[7]	(45,658)	[8]	(169,589)	[9]
Amortization of intangible assets		(24,427)	[1],[6]	(24,851)	[2],[7]	(73,839)	[3],[8]	(74,913)	[4],[9]
Segment profit (loss)		26,163	[6]	51,746	[7]	80,879	[8]	53,636	[9]
Underwriting Segments [Member]
Segment Reporting Information [Line Items]
Amortization of intangible assets		$ 9,100	[6]	$ 9,600	[2]	$ 28,000	[3]	$ 29,000	[4]

[1] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.1 million for the quarter ended September 30, 2023

[2] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $9.6 million for the quarter ended September 30, 2022

[3] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $28.0 million for the nine months ended September 30, 2023.

[4] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $29.0 million for the nine months ended September 30, 2022.

[5] Interest expense for the quarter and nine months ended September 30, 2023 included intercompany interest expense of $6.6 million and $19.9 million, respectively. Interest expense for the quarter and nine months ended September 30, 2022 included intercompany interest expense of $6.6 million and $20.7 million, respectively. Intercompany interest expense was eliminated in consolidation.

[6] Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

[7] Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

[8] Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

[9] Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to underwriting segments, which is not allocated between the Insurance and Reinsurance segments.

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Segment Reporting Disclosures (Summary of Additional Measures for Markel Ventures) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Interest expense		$ 44,553	$ 47,348	$ 141,212	$ 147,090
Income tax expense		14,235	16,460	339,903	(240,629)
Markel Ventures [Member]
Segment Reporting Information [Line Items]
Depreciation expense		26,857	23,738	81,639	75,304
Interest expense	[1]	10,663	11,921	36,485	34,124
Income tax expense		22,253	12,603	66,022	43,682
Capital expenditures		65,616	48,294	135,159	144,974
Markel Ventures [Member] | Intercompany interest expense
Segment Reporting Information [Line Items]
Interest expense	[1]	$ 6,600	$ 6,600	$ 19,900	$ 20,700

[1] Interest expense for the quarter and nine months ended September 30, 2023 included intercompany interest expense of $6.6 million and $19.9 million, respectively. Interest expense for the quarter and nine months ended September 30, 2022 included intercompany interest expense of $6.6 million and $20.7 million, respectively. Intercompany interest expense was eliminated in consolidation.

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Segment Reporting Disclosures (Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Assets	$ 52,748,716	$ 49,791,259
Other [Member]
Segment Reporting Information [Line Items]
Assets	8,898,006	8,639,743
Segment assets [Member]
Segment Reporting Information [Line Items]
Assets	43,850,710	41,151,516
Segment assets [Member] | Investing [Member]
Segment Reporting Information [Line Items]
Assets	28,522,052	26,982,280
Segment assets [Member] | Underwriting [Member]
Segment Reporting Information [Line Items]
Assets	9,884,553	8,853,559
Segment assets [Member] | Markel Ventures [Member]
Segment Reporting Information [Line Items]
Assets	$ 5,444,105	$ 5,315,677

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Investments (Narrative) (Details) $ in Thousands	Sep. 30, 2023 USD ($) securities	Dec. 31, 2022 USD ($) securities
Schedule of Investments [Line Items]
Available-for-sale fixed maturity securities in unrealized loss position, number of positions | securities	1,732	1,400
Available-for-sale securities, estimated fair value	$ 13,027,738	$ 11,280,896
Available-for-sale securities, gross unrealized holding losses	$ (1,121,484)	$ (962,210)
Number of available-for-sale fixed maturity securities positions in a continuous unrealized loss position for one year or longer at period end | securities	1,150	246
Available-for-sale securities, estimated fair value, 12 months or longer	$ 8,805,736	$ 3,356,273
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(1,001,104)	(393,911)
Investments, available-for-sale, allowance for credit losses	$ 0	$ 0

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Investments (Available-For-Sale Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	$ 14,067,742	$ 12,805,887
Available-for-sale fixed maturity investments, gross unrealized holding gains	4,275	13,100
Available-for-sale fixed maturity investments, gross unrealized holding losses	(1,120,738)	(962,152)
Available-for-sale fixed maturity investments, estimated fair value	12,951,279	11,856,835
Short-term investments, available-for-sale, amortized cost	2,250,219	2,663,560
Short-term investments, available-for-sale, gross unrealized holding gains	3,253	5,760
Short-term investments, available-for-sale, gross unrealized holding losses	(746)	(58)
Short-term investments, available-for-sale, estimated fair value	2,252,726	2,669,262
Investments, available-for-sale, amortized cost	16,317,961	15,469,447
Investments, available-for-sale, gross unrealized holding gains	7,528	18,860
Investments, available-for-sale, gross unrealized holding losses	(1,121,484)	(962,210)
Investments, available-for-sale, estimated fair value	15,204,005	14,526,097
U.S. Treasury securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	3,440,991	3,050,089
Available-for-sale fixed maturity investments, gross unrealized holding gains	0	2,363
Available-for-sale fixed maturity investments, gross unrealized holding losses	(130,162)	(138,493)
Available-for-sale fixed maturity investments, estimated fair value	3,310,829	2,913,959
U.S. government-sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	1,133,417	871,463
Available-for-sale fixed maturity investments, gross unrealized holding gains	0	154
Available-for-sale fixed maturity investments, gross unrealized holding losses	(137,733)	(106,079)
Available-for-sale fixed maturity investments, estimated fair value	995,684	765,538
Obligations of states, municipalities and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	4,106,251	3,973,911
Available-for-sale fixed maturity investments, gross unrealized holding gains	879	6,503
Available-for-sale fixed maturity investments, gross unrealized holding losses	(308,184)	(247,231)
Available-for-sale fixed maturity investments, estimated fair value	3,798,946	3,733,183
Foreign governments [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	1,749,621	1,473,658
Available-for-sale fixed maturity investments, gross unrealized holding gains	2,626	2,843
Available-for-sale fixed maturity investments, gross unrealized holding losses	(189,128)	(169,723)
Available-for-sale fixed maturity investments, estimated fair value	1,563,119	1,306,778
Commercial mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	2,297,828	2,109,721
Available-for-sale fixed maturity investments, gross unrealized holding gains	11	395
Available-for-sale fixed maturity investments, gross unrealized holding losses	(208,466)	(169,668)
Available-for-sale fixed maturity investments, estimated fair value	2,089,373	1,940,448
Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	511,525	553,591
Available-for-sale fixed maturity investments, gross unrealized holding gains	1	6
Available-for-sale fixed maturity investments, gross unrealized holding losses	(32,686)	(26,804)
Available-for-sale fixed maturity investments, estimated fair value	478,840	526,793
Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	1,226	1,693
Available-for-sale fixed maturity investments, gross unrealized holding gains	0	0
Available-for-sale fixed maturity investments, gross unrealized holding losses	(28)	(53)
Available-for-sale fixed maturity investments, estimated fair value	1,198	1,640
Corporate bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, amortized cost	826,883	771,761
Available-for-sale fixed maturity investments, gross unrealized holding gains	758	836
Available-for-sale fixed maturity investments, gross unrealized holding losses	(114,351)	(104,101)
Available-for-sale fixed maturity investments, estimated fair value	$ 713,290	$ 668,496

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Investments (Summary Of Gross Unrealized Investment Losses By Length Of Time That Securities Have Continuously Been In An Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	$ 4,222,002	$ 7,924,623
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(120,380)	(568,299)
Available-for-sale securities, estimated fair value, 12 months or longer	8,805,736	3,356,273
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(1,001,104)	(393,911)
Available-for-sale securities, estimated fair value	13,027,738	11,280,896
Available-for-sale securities, gross unrealized holding losses	(1,121,484)	(962,210)
Short-term investments, estimated fair value, less than 12 months	203,710	774,480
Short-term investments, gross unrealized holding losses, less than 12 months	(746)	(58)
Short-term investments, estimated fair value, 12 months or longer	0	0
Short-term investments, gross unrealized holding losses, 12 months or longer	0	0
Short-term investments, estimated fair value	203,710	774,480
Short-term investments, gross unrealized holding losses	(746)	(58)
U.S. Treasury securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	1,339,577	735,605
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(33,496)	(30,583)
Available-for-sale securities, estimated fair value, 12 months or longer	1,971,252	1,907,922
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(96,666)	(107,910)
Available-for-sale securities, estimated fair value	3,310,829	2,643,527
Available-for-sale securities, gross unrealized holding losses	(130,162)	(138,493)
U.S. government-sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	302,362	413,495
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(13,784)	(40,488)
Available-for-sale securities, estimated fair value, 12 months or longer	693,322	331,391
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(123,949)	(65,591)
Available-for-sale securities, estimated fair value	995,684	744,886
Available-for-sale securities, gross unrealized holding losses	(137,733)	(106,079)
Obligations of states, municipalities and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	1,469,105	2,474,289
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(36,622)	(164,537)
Available-for-sale securities, estimated fair value, 12 months or longer	2,240,788	348,943
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(271,562)	(82,694)
Available-for-sale securities, estimated fair value	3,709,893	2,823,232
Available-for-sale securities, gross unrealized holding losses	(308,184)	(247,231)
Foreign governments [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	442,453	900,322
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(18,214)	(115,324)
Available-for-sale securities, estimated fair value, 12 months or longer	1,095,516	300,423
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(170,914)	(54,399)
Available-for-sale securities, estimated fair value	1,537,969	1,200,745
Available-for-sale securities, gross unrealized holding losses	(189,128)	(169,723)
Commercial mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	321,255	1,611,603
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(13,554)	(117,482)
Available-for-sale securities, estimated fair value, 12 months or longer	1,764,367	305,217
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(194,912)	(52,186)
Available-for-sale securities, estimated fair value	2,085,622	1,916,820
Available-for-sale securities, gross unrealized holding losses	(208,466)	(169,668)
Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	45,081	516,423
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(1,074)	(25,232)
Available-for-sale securities, estimated fair value, 12 months or longer	433,695	9,342
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(31,612)	(1,572)
Available-for-sale securities, estimated fair value	478,776	525,765
Available-for-sale securities, gross unrealized holding losses	(32,686)	(26,804)
Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	0	1,640
Available-for-sale securities, gross unrealized holding losses, less than 12 months	0	(53)
Available-for-sale securities, estimated fair value, 12 months or longer	1,198	0
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(28)	0
Available-for-sale securities, estimated fair value	1,198	1,640
Available-for-sale securities, gross unrealized holding losses	(28)	(53)
Corporate bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	98,459	496,766
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(2,890)	(74,542)
Available-for-sale securities, estimated fair value, 12 months or longer	605,598	153,035
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(111,461)	(29,559)
Available-for-sale securities, estimated fair value	704,057	649,801
Available-for-sale securities, gross unrealized holding losses	(114,351)	(104,101)
Total fixed maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	4,018,292	7,150,143
Available-for-sale securities, gross unrealized holding losses, less than 12 months	(119,634)	(568,241)
Available-for-sale securities, estimated fair value, 12 months or longer	8,805,736	3,356,273
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(1,001,104)	(393,911)
Available-for-sale securities, estimated fair value	12,824,028	10,506,416
Available-for-sale securities, gross unrealized holding losses	$ (1,120,738)	$ (962,152)

XML

Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 1,245,195
Due after one year through five years, amortized cost	4,731,573
Due after five years through ten years, amortized cost	3,655,839
Due after ten years, amortized cost	1,624,556
Amortized cost, sub-total	11,257,163
Total fixed maturities, amortized cost	14,067,742	$ 12,805,887
Due in one year or less, estimated fair value	1,221,058
Due after one year through five years, estimated fair value	4,490,492
Due after five years through ten years, estimated fair value	3,269,429
Due after ten years, estimated fair value	1,400,889
Estimated fair value, sub-total	10,381,868
Total fixed maturities, estimated fair value	12,951,279	11,856,835
Commercial mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	2,297,828
Total fixed maturities, amortized cost	2,297,828	2,109,721
Fixed maturities, estimated fair value	2,089,373
Total fixed maturities, estimated fair value	2,089,373	1,940,448
Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	511,525
Total fixed maturities, amortized cost	511,525	553,591
Fixed maturities, estimated fair value	478,840
Total fixed maturities, estimated fair value	478,840	526,793
Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	1,226
Total fixed maturities, amortized cost	1,226	1,693
Fixed maturities, estimated fair value	1,198
Total fixed maturities, estimated fair value	$ 1,198	$ 1,640

XML

Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Dividends on equity securities	$ 31,134	$ 25,962	$ 84,968	$ 74,289
Total investment income	196,266	116,549	534,070	314,093
Investment expenses	(4,059)	(3,935)	(12,835)	(12,380)
Net investment income	192,207	112,614	521,235	301,713
Fixed Maturities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	98,891	72,477	269,438	215,541
Short-term investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	26,768	10,316	77,099	14,644
Cash and Cash Equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	$ 39,473	$ 7,794	$ 102,565	$ 9,619

XML

Investments (Summary Of Net Investment Gains (Losses) And The Change In Net Unrealized Gains On Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gain (Loss) on Securities [Line Items]
Net realized investment gains (losses)	$ (36,093)	$ 2,032	$ (38,159)	$ 6,001
Equity securities, Change in fair value of securities sold during the period	2,683	2,553	16,706	(29,015)
Equity securities, Change in fair value of securities held at the end of the period	(232,507)	(286,068)	612,626	(2,171,511)
Total change in fair value of equity securities	(229,824)	(283,515)	629,332	(2,200,526)
Net investment gains (losses)	(265,917)	(281,483)	591,173	(2,194,525)
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive loss:	(208,405)	(538,347)	(170,606)	(1,656,623)
Fixed Maturities [Member]
Gain (Loss) on Securities [Line Items]
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive loss:	(208,598)	(530,161)	(167,411)	(1,645,060)
Short-term investments [Member]
Gain (Loss) on Securities [Line Items]
Change in net unrealized gains (losses) on available-for-sale investments included in other comprehensive loss:	$ 193	$ (8,186)	$ (3,195)	$ (11,563)

XML

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales	$ 0	$ (3,528)	$ 0	$ (56,335)
Unconsolidated Markel CATCo Fund 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales			(41,300)
Fair value, nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis	0	0	0	0
Liabilities measured at fair value on a nonrecurring basis	$ 0	$ 0	$ 0	$ 0

XML

Fair Value Measurements (Balances Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	$ 12,951,279	$ 11,856,835
Equity securities	8,574,957	7,671,912
Short-term investments, available-for-sale	2,252,726	2,669,262
Total Investments	23,778,962	22,198,009
U.S. Treasury securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	3,310,829	2,913,959
U.S. government-sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	995,684	765,538
Obligations of states, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	3,798,946	3,733,183
Foreign governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	1,563,119	1,306,778
Commercial mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	2,089,373	1,940,448
Residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	478,840	526,793
Asset-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	1,198	1,640
Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	713,290	668,496
Fair value, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	12,951,279	11,856,835
Equity securities	8,574,957	7,671,912
Short-term investments, available-for-sale	2,252,726	2,669,262
Total Investments	23,778,962	22,198,009
Fair value, recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Equity securities	8,574,015	7,671,013
Short-term investments, available-for-sale	2,085,072	2,510,164
Total Investments	10,659,087	10,181,177
Fair value, recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	12,951,279	11,856,835
Equity securities	0	0
Short-term investments, available-for-sale	167,654	159,098
Total Investments	13,118,933	12,015,933
Fair value, recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Equity securities	942	899
Short-term investments, available-for-sale	0	0
Total Investments	942	899
Fair value, recurring [Member] | U.S. Treasury securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	3,310,829	2,913,959
Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	3,310,829	2,913,959
Fair value, recurring [Member] | U.S. Treasury securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	995,684	765,538
Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	995,684	765,538
Fair value, recurring [Member] | U.S. government-sponsored enterprises [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	3,798,946	3,733,183
Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	3,798,946	3,733,183
Fair value, recurring [Member] | Obligations of states, municipalities and political subdivisions [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Foreign governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	1,563,119	1,306,778
Fair value, recurring [Member] | Foreign governments [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Foreign governments [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	1,563,119	1,306,778
Fair value, recurring [Member] | Foreign governments [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Commercial mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	2,089,373	1,940,448
Fair value, recurring [Member] | Commercial mortgage-backed securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Commercial mortgage-backed securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	2,089,373	1,940,448
Fair value, recurring [Member] | Commercial mortgage-backed securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	478,840	526,793
Fair value, recurring [Member] | Residential mortgage-backed securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Residential mortgage-backed securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	478,840	526,793
Fair value, recurring [Member] | Residential mortgage-backed securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Asset-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	1,198	1,640
Fair value, recurring [Member] | Asset-backed securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Asset-backed securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	1,198	1,640
Fair value, recurring [Member] | Asset-backed securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	713,290	668,496
Fair value, recurring [Member] | Corporate bonds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Corporate bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	713,290	668,496
Fair value, recurring [Member] | Corporate bonds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale fixed maturity investments, estimated fair value	0	0
Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,305,241	2,953,588
Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,304,299	2,952,689
Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair value, recurring [Member] | Insurance, banks and other financial institutions [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	942	899
Fair value, recurring [Member] | Industrial, consumer and all other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	5,269,716	4,718,324
Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	5,269,716	4,718,324
Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair value, recurring [Member] | Industrial, consumer and all other [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 0	$ 0

XML

Fair Value Measurements (Summary Of Changes In Level 3 Investments Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, beginning of period	$ 936	$ 4,380	$ 899	$ 56,472
Purchases	0	0	0	0
Sales	0	(3,528)	0	(56,335)
Net investment gains	6	69	43	784
Equity securities, end of period	$ 942	$ 921	$ 942	$ 921

XML

Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 582.8		$ 582.8		$ 494.0
Income (loss) from equity method investments	4.2	$ (7.1)	(0.4)	$ (36.1)
Hagerty, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 235.4		$ 235.4		$ 245.1
Equity method investment, ownership percentage	23.00%		23.00%		23.00%
Equity method investment, quoted market value	$ 637.3		$ 637.3		$ 656.0

XML

Products, Services and Other Revenues (Schedule Of Revenues From Contracts With Customers By Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Other revenues	$ 1,327,151	$ 1,278,184	$ 3,928,111	$ 3,807,696
Income (loss) from equity method investments	4,200	(7,100)	(400)	(36,100)
Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	1,230,327	1,197,164	3,657,610	3,499,966
Products [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	585,707	575,277	1,921,773	1,809,276
Services [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	600,416	606,246	1,659,729	1,635,493
Investment management [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	44,204	15,641	76,108	55,197
Program services and other fronting [Member]
Disaggregation of Revenue [Line Items]
Other revenues	39,499	40,033	105,952	103,096
Disposition gain
Disaggregation of Revenue [Line Items]
Other revenues			16,923	107,293
Equity method investments income (loss) [Member]
Disaggregation of Revenue [Line Items]
Income (loss) from equity method investments	4,243	(7,101)	(398)	(36,102)
Other [Member]
Disaggregation of Revenue [Line Items]
Other revenues	53,082	48,088	148,024	133,443
Markel Ventures [Member]
Disaggregation of Revenue [Line Items]
Other revenues	1,245,577	1,215,746	3,735,329	3,527,429
Markel Ventures [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	1,183,219	1,169,994	3,573,960	3,403,222
Markel Ventures [Member] | Products [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	585,707	575,277	1,921,773	1,809,276
Markel Ventures [Member] | Services [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	597,512	594,717	1,652,187	1,593,946
Markel Ventures [Member] | Investment management [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	0	0	0	0
Markel Ventures [Member] | Program services and other fronting [Member]
Disaggregation of Revenue [Line Items]
Other revenues	0	0	0	0
Markel Ventures [Member] | Disposition gain
Disaggregation of Revenue [Line Items]
Other revenues			0	0
Markel Ventures [Member] | Equity method investments income (loss) [Member]
Disaggregation of Revenue [Line Items]
Income (loss) from equity method investments	(21)	(546)	1,087	1,537
Markel Ventures [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Other revenues	62,379	46,298	160,282	122,670
Other [Member]
Disaggregation of Revenue [Line Items]
Other revenues	81,574	62,438	192,782	280,267
Other [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	47,108	27,170	83,650	96,744
Other [Member] | Products [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	0	0	0	0
Other [Member] | Services [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	2,904	11,529	7,542	41,547
Other [Member] | Investment management [Member] | Revenue from contracts with customers [Member]
Disaggregation of Revenue [Line Items]
Other revenues	44,204	15,641	76,108	55,197
Other [Member] | Program services and other fronting [Member]
Disaggregation of Revenue [Line Items]
Other revenues	39,499	40,033	105,952	103,096
Other [Member] | Disposition gain
Disaggregation of Revenue [Line Items]
Other revenues			16,923	107,293
Other [Member] | Equity method investments income (loss) [Member]
Disaggregation of Revenue [Line Items]
Income (loss) from equity method investments	4,264	(6,555)	(1,485)	(37,639)
Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Other revenues	$ (9,297)	$ 1,790	$ (12,258)	$ 10,773

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Products, Services and Other Revenues (Schedule Of Revenues From Disposition of Business) (Details) - USD ($) $ in Millions	Jun. 01, 2023	Feb. 01, 2022
Velocity [Member]
Schedule of Business Dispositions, by Dispositions [Line Items]
Gain on sale of business		$ 107.3
ISIC [Member]
Schedule of Business Dispositions, by Dispositions [Line Items]
Gain on sale of business	$ 16.9

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Products, Services and Other Revenues (Schedule Of Receivables And Customer Deposits Related To Contracts With Customers) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Contracts with customers [Member]
Receivables [Line Items]
Trade and Other Receivables, Net	$ 683.1	$ 624.1

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Unpaid Losses And Loss Adjustment Expenses (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Aug. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current accident years	$ 1,434,871	$ 1,266,996	$ 3,934,969	$ 3,420,906
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease)			25,000
Favorable (adverse) development on prior years' loss reserves			169,754	204,411
Reinsurance recoverable for retroactive reinsurance transaction	(125,067)	0	(125,067)	0
Vesttoo LOC 1
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Letters of Credit, Collateral for Reinsurance Recoverable					$ 50,000
Vesttoo LOC 2
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Letters of Credit, Collateral for Reinsurance Recoverable					$ 77,800
Hawaiian wildfires and Hurricane Idalia
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current accident years			46,200
Hurricane Ian (2022)
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current accident years				70,000
Russian-Ukraine Conflict
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current accident years				35,000
Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current accident years	1,258,864	1,100,511	3,415,860	2,906,031
Insurance [Member] | Professional Liability, Property, Marine and Energy, Workers Comp and Personal lines [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Favorable (adverse) development on prior years' loss reserves			239,800
Insurance [Member] | General Liability [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Favorable (adverse) development on prior years' loss reserves			70,500
Insurance [Member] | Workers' Compensation, Property, Marine and Energy and Programs [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Favorable (adverse) development on prior years' loss reserves				155,000
Reinsurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current accident years	176,007	$ 166,485	519,109	514,875
Reinsurance recoverable for retroactive reinsurance transaction	$ (125,100)		(125,100)
Reinsurance [Member] | Professional liability and Property [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Favorable (adverse) development on prior years' loss reserves			34,100
Reinsurance [Member] | Public Entity and General Liability
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Favorable (adverse) development on prior years' loss reserves			$ (60,900)
Reinsurance [Member] | Property and Credit and Surety
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Favorable (adverse) development on prior years' loss reserves				$ 41,700

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Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Gross reserves for losses and loss adjustment expenses, beginning of year			$ 20,947,898	$ 18,178,894
Reinsurance recoverable on unpaid losses, beginning of year			7,994,884	6,876,317
Net reserves for losses and loss adjustment expenses, beginning of year			12,953,014	11,302,577
Effect of foreign currency rate changes on beginning of year balance	$ 16,246	$ (275,364)	16,246	(275,364)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year			12,969,260	11,027,213
Incurred losses and loss adjustment expenses, current accident years	1,434,871	1,266,996	3,934,969	3,420,906
Incurred losses and loss adjustment expenses, prior accident years			(169,754)	(204,411)
Total incurred losses and loss adjustment expenses			3,765,215	3,216,495
Payments, current accident year			419,998	350,684
Payments, prior accident years			2,018,199	1,880,471
Total payments			2,438,197	2,231,155
Effect of foreign currency rate changes on current year activity			416	(7,499)
Net reserves for losses and loss adjustment expenses of Markel CATCo Re			(146,895)	375,222
Reinsurance recoverable for retroactive reinsurance transaction	(125,067)	0	(125,067)	0
Net reserves for losses and loss adjustment expenses, end of period	14,024,732	12,380,276	14,024,732	12,380,276
Reinsurance recoverable on unpaid losses	8,119,634	7,814,098	8,119,634	7,814,098
Gross reserves for losses and loss adjustment expenses, end of period	$ 22,144,366	$ 20,194,374	$ 22,144,366	$ 20,194,374

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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Percentage of ceded earned premiums to gross earned premiums	40.00%	40.00%	38.00%	38.00%
Percentage of assumed earned premiums to net earned premiums	35.00%	32.00%	29.00%	28.00%
Underwriting [Member]
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross losses and loss adjustment expenses	$ 1,684,389	$ 1,423,526	$ 4,552,926	$ 3,760,566
Ceded losses	278,945	238,220	786,876	544,109
Program services and other fronting [Member]
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross losses and loss adjustment expenses	743,800	1,300,000	1,800,000	2,300,000
Ceded losses	$ (744,900)	$ (1,330,700)	$ (1,835,900)	$ (2,321,200)

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Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Effects of Reinsurance [Line Items]
Direct premiums written	$ 2,839,412	$ 2,797,453	$ 8,491,896	$ 8,091,131
Direct premiums earned	2,796,788	2,629,128	8,084,663	7,406,497
Assumed premiums written	839,394	677,318	2,411,107	2,061,976
Assumed premiums earned	737,699	627,000	1,794,614	1,526,919
Ceded premiums written	(1,651,001)	(1,465,604)	(4,449,727)	(3,879,411)
Ceded premiums earned	(1,412,742)	(1,299,298)	(3,758,685)	(3,383,712)
Net premiums written	2,027,805	2,009,167	6,453,276	6,273,696
Net premiums earned	2,121,745	1,956,830	6,120,592	5,549,704
Underwriting [Member]
Effects of Reinsurance [Line Items]
Direct premiums written	2,223,988	2,133,822	6,479,090	6,065,936
Direct premiums earned	2,127,244	1,899,816	6,124,444	5,370,481
Assumed premiums written	282,070	349,650	1,419,802	1,466,036
Assumed premiums earned	424,620	408,561	1,247,743	1,194,504
Ceded premiums written	(478,035)	(473,885)	(1,444,626)	(1,255,226)
Ceded premiums earned	(429,901)	(351,118)	(1,250,605)	(1,012,485)
Net premiums written	2,028,023	2,009,587	6,454,266	6,276,746
Net premiums earned	2,121,963	1,957,259	6,121,582	5,552,500
Program services and other fronting [Member]
Effects of Reinsurance [Line Items]
Direct premiums written	615,424	663,631	2,012,806	2,025,195
Direct premiums earned	669,544	729,312	1,960,219	2,036,016
Assumed premiums written	557,324	327,668	991,305	595,940
Assumed premiums earned	313,079	218,439	546,871	332,415
Ceded premiums written	(1,172,966)	(991,719)	(3,005,101)	(2,624,185)
Ceded premiums earned	(982,841)	(948,180)	(2,508,080)	(2,371,227)
Net premiums written	(218)	(420)	(990)	(3,050)
Net premiums earned	$ (218)	$ (429)	$ (990)	$ (2,796)

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Reinsurance Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Losses) (Details) - Underwriting [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Effects of Reinsurance [Line Items]
Gross losses and loss adjustment expenses	$ 1,684,389	$ 1,423,526	$ 4,552,926	$ 3,760,566
Ceded losses and loss adjustment expenses	(278,945)	(238,220)	(786,876)	(544,109)
Net losses and loss adjustment expenses	$ 1,405,444	$ 1,185,306	$ 3,766,050	$ 3,216,457

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Life and Annuity Benefits (Schedule of Future Policyholder Benefits) (Details) - USD ($) $ in Thousands	Sep. 30, 2023		Dec. 31, 2022	Sep. 30, 2022	[1]	Dec. 31, 2021
Liability for Future Policy Benefit, before Reinsurance [Abstract]
Liability for future policyholder benefits	$ 508,436	[1]	$ 554,366	$ 523,095		$ 821,632
Deferred profit liability	52,034		48,569
Other	39,786		47,786
Total	$ 600,256		$ 650,721

[1] The undiscounted liability for future policyholder benefits was $813.6 million and $822.3 million as of September 30, 2023 and 2022, respectively.

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Life and Annuity Benefits (Liability for Future Policy Benefit, Activity) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefits Activity [Abstract]
Liability for future policyholder benefits, beginning of year		$ 554,366	$ 821,632
Liability for future policyholder benefits at original discount rate, beginning of year		667,761	745,313
Effect of changes in cash flow assumptions				$ 0	$ 0
Effect of actual variances from expected experience				(5,890)	$ (3,859)
Adjusted liability for future policyholder benefits, beginning of year		661,871	741,454
Interest accretion		11,251	11,909
Benefit payments		(39,819)	(40,643)
Effect of foreign currency changes		(356)	(77,166)
Liability for future policy holder benefits t original discount rate, end of period		632,947	635,554
Cumulative effect of changes in discount rate assumptions		(124,511)	(112,459)
Liability for future policyholder benefits, beginning of year, ending of period	[1]	508,436	$ 523,095
Undiscounted liability for future policyholder benefits		$ 813,600		$ 822,300

[1] The undiscounted liability for future policyholder benefits was $813.6 million and $822.3 million as of September 30, 2023 and 2022, respectively.

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Life and Annuity Benefits (Schedule of Additional Details of Liability for Future Policyholder Benefits) (Details)	Sep. 30, 2023 Rate	Dec. 31, 2022 Rate
Schedule of Additional Details of Liability for Future Policyholder Benefits, Life and Annuity Benefits [Abstract]
Interest accretion rate	2.30%	2.30%
Current discount rate	4.70%	4.30%
Weighted-average liability duration	8 years 2 months 12 days	8 years 7 months 6 days

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Debt (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Line of Credit Facility, Initiation Date	Jun. 23, 2023
Line of Credit Facility, Expiration Date	Jun. 23, 2028
Senior Notes | 3.625% Unsecured Senior Notes due March 30, 2023
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.625%
Debt Instrument, Face Amount	$ 250.0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300.0
Line of Credit Facility, Increase	200.0
Long-term Line of Credit	0.0	$ 0.0
Revolving Credit Facility | Markel Ventures [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	715.0
Long-term Line of Credit	171.3	$ 238.1
Revolving Credit Facility | Secured Letters of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200.0
Previous line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 300.0

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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Mar. 31, 2022
Variable Interest Entity [Line Items]
Cash funding used to purchase Markel CATCo Funds' interests in Markel CATCo Re							$ 45,100
Additional payments made, net of insurance in proceeds, to Markel CATCo Funds investors							$ 101,900
Returned capital from Markel CATCo Re	$ 24,900
Investment in Markel CATCo Re		$ 20,100		$ 20,100		$ 20,100
Percentage of Markel CATCo Re net equity held by the Company		25.00%		25.00%		23.00%
Tail risk cover in Markel CATCo transaction		$ 142,700		$ 142,700
Favorable development on prior years' loss reserves				169,754	$ 204,411
Redemption of Markel CATCo Re noncontrolling interests				(88,997)	0
Noncontrolling Interests [Member]
Variable Interest Entity [Line Items]
Redemption of Markel CATCo Re noncontrolling interests				(62,646)	(22,261)
Markel CATCo Re
Variable Interest Entity [Line Items]
Favorable development on prior years' loss reserves		$ (2,200)	$ (53,400)	$ (55,700)	$ (81,600)

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Variable Interest Entities (Markel CATCo Re Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 4,354,858	$ 4,137,432
Restricted cash and cash equivalents	690,004	1,084,081
Total Assets	52,748,716	49,791,259
Unpaid losses and loss adjustment expenses	22,144,366	20,947,898	$ 20,194,374	$ 18,178,894
Other liabilities	3,590,807	3,461,482
Total Liabilities	38,226,087	36,054,220
Shareholders' equity	13,999,159	13,151,094
Noncontrolling interests	56,084	62,791
Total Equity	14,055,243	13,213,885
Total Liabilities and Equity	52,748,716	49,791,259
Markel CATCo Re
Variable Interest Entity [Line Items]
Cash and cash equivalents	70,852	104,443
Restricted cash and cash equivalents	193,778	317,577
Other assets and receivables due from cedents	19,416	41,357
Total Assets	284,046	463,377
Unpaid losses and loss adjustment expenses	201,026	347,921
Other liabilities	1,232	26,717
Total Liabilities	202,258	374,638
Shareholders' equity	21,139	21,139
Noncontrolling interests	60,649	67,600
Total Equity	81,788	88,739
Total Liabilities and Equity	$ 284,046	$ 463,377

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Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 01, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Services and other revenues		$ 725,627	$ 691,653	$ 1,963,779	$ 1,962,585
Reinsurance recoverables		8,534,919		8,534,919		$ 8,446,745
ISIC [Member]
Related Party Transaction [Line Items]
Gain on sale of business	$ 16,900
Nephila Reinsurers [Member]
Related Party Transaction [Line Items]
Reinsurance recoverables		874,100		874,100		1,400,000
Hagerty, Inc. [Member]
Related Party Transaction [Line Items]
Reinsurance recoverables		200,000		200,000		$ 159,700
Insurance-linked Securities Operations [Member] | Unconsolidated entities managed by Nephila [Member]
Related Party Transaction [Line Items]
Services and other revenues		$ 43,600	$ 17,100	$ 74,100	$ 57,000

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Related Party Disclosures (Nephila) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Premiums ceded	$ 1,651,001	$ 1,465,604	$ 4,449,727	$ 3,879,411
Program services and other fronting [Member] | Nephila Reinsurers [Member]
Related Party Transaction [Line Items]
Gross premium volume	501,838	398,872	1,036,126	889,644
Premiums ceded	501,838	398,872	1,036,126	889,644
Underwriting [Member] | Nephila Reinsurers [Member]
Related Party Transaction [Line Items]
Premiums ceded	$ 10,058	$ 15,037	$ 39,905	$ 44,656

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Related Party Disclosures (Hagarty) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Premiums ceded	$ 1,651,001	$ 1,465,604	$ 4,449,727	$ 3,879,411
Hagerty, Inc. [Member]
Related Party Transaction [Line Items]
Gross premium volume	227,693	197,041	628,889	540,447
Premiums ceded	$ 174,455	$ 130,430	$ 480,924	$ 357,729

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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Earnings Per Share [Line Items]
Common stock, shares authorized	50,000,000
Common stock, no par value	$ 0
Preferred stock, shares authorized	10,000,000
Preferred stock, no par value	$ 0
Preferred stock dividends	$ 18,000	$ 18,000
Preferred stock, dividends, per share, cash paid	$ 30	$ 30
Common Stock [Member]
Earnings Per Share [Line Items]
Preferred stock dividends	$ 0	$ 0
Series A preferred stock [Member]
Earnings Per Share [Line Items]
Preferred stock, shares issued	600,000		600,000
Preferred stock, shares outstanding	600,000		600,000

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Shareholders' Equity (Schedule of Common Stock Outstanding Roll Forward) (Details) - Common Stock [Member] - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Class of Stock [Line Items]
Shares, Issued, Beginning Balance	13,284,998	13,537,895	13,422,692	13,631,740
Repurchase of common shares	(56,483)	(67,696)	(196,645)	(163,733)
Shares, Issued, Ending Balance	13,231,522	13,470,893	13,231,522	13,470,893
Shares, outstanding	13,231,522	13,470,893	13,231,522	13,470,893
Common Stock [Member]
Class of Stock [Line Items]
Issuance of common shares	3,007	694	5,475	2,886

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Shareholders' Equity (Schedule Of Net Income (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Line Items]
Net income (loss) to common shareholders	$ 42,591	$ 59,594		$ 1,208,754	$ (925,943)
Adjustment of redeemable noncontrolling interests	(628)	(17,730)		7,087	(62,168)
Adjusted net income (loss) to common shareholders	$ 41,963	$ 41,864		$ 1,215,841	$ (988,111)
Basic common shares outstanding	13,315	13,564		13,382	13,609
Diluted common shares outstanding	13,345	13,595		13,406	13,609
Basic net income (loss) per common share	$ 3.15	$ 3.09		$ 90.86	$ (72.61)
Earnings Per Share, Diluted	$ 3.14	$ 3.08	[1]	$ 90.69	$ (72.61)	[1]
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Dilutive potential common shares from restricted stock units and restricted stock	30	31	[1]	24	0	[1]
Potential Incremental Common Shares Attributable to Share-based Payment Arrangements					28

[1] The impact of 28 thousand shares from restricted stock units and restricted stock was excluded from the computation of diluted net loss per common share for the nine months ended September 30, 2022 because the effect would have been anti-dilutive.