XML 41 R30.htm IDEA: XBRL DOCUMENT v3.23.2

Reinsurance (Tables)

6 Months Ended

Jun. 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 June 30,
			2023																								2022
(dollars in thousands)			Direct						Assumed						Ceded						Net Premiums						Direct						Assumed						Ceded						Net Premiums
Underwriting:
Written			$	2,285,739					$	448,837					$	(526,562)					$	2,208,014					$	2,108,859					$	420,026					$	(427,959)					$	2,100,926
Earned			2,025,324						424,404						(418,264)						2,031,464						1,772,695						382,876						(321,438)						1,834,133
Program services and other fronting:
Written			824,171						229,438						(1,053,930)						(321)						664,590						86,574						(752,295)						(1,131)
Earned			649,562						159,075						(808,958)						(321)						607,099						65,116						(673,244)						(1,029)
Consolidated:
Written			3,109,910						678,275						(1,580,492)						2,207,693						2,773,449						506,600						(1,180,254)						2,099,795
Earned			$	2,674,886					$	583,479					$	(1,227,222)					$	2,031,143					$	2,379,794					$	447,992					$	(994,682)					$	1,833,104

			Six Months Ended June 30,
			2023																								2022
(dollars in thousands)			Direct						Assumed						Ceded						Net Premiums						Direct						Assumed						Ceded						Net Premiums
Underwriting:
Written			$	4,255,102					$	1,137,732					$	(966,591)					$	4,426,243					$	3,932,114					$	1,116,386					$	(781,341)					$	4,267,159
Earned			3,997,200						823,123						(820,704)						3,999,619						3,470,665						785,943						(661,367)						3,595,241
Program services and other fronting:
Written			1,397,382						433,981						(1,832,135)						(772)						1,361,564						268,272						(1,632,466)						(2,630)
Earned			1,290,675						233,792						(1,525,239)						(772)						1,306,704						113,976						(1,423,047)						(2,367)
Consolidated:
Written			5,652,484						1,571,713						(2,798,726)						4,425,471						5,293,678						1,384,658						(2,413,807)						4,264,529
Earned			$	5,287,875					$	1,056,915					$	(2,345,943)					$	3,998,847					$	4,777,369					$	899,919					$	(2,084,414)					$	3,592,874

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 June 30,												Six Months Ended June 30,
(dollars in thousands)			2023						2022						2023						2022
Gross losses and loss adjustment expenses			$	1,476,189					$	1,186,691					$	2,868,537					$	2,337,040
Ceded losses and loss adjustment expenses			(288,676)						(127,895)						(507,931)						(305,889)
Net losses and loss adjustment expenses			$	1,187,513					$	1,058,796					$	2,360,606					$	2,031,151

X

- Definition

Effects of Reinsurance on Losses [Table Text Block]

+ References

No definition available.

+ Details

Name:	mkl_EffectsOfReinsuranceOnLossesAndLossAdjustmentExpensesTableTextBlock
Namespace Prefix:	mkl_
Data Type:	dtr-types1:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 605
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479655/944-605-50-1

+ Details

Name:	us-gaap_EffectsOfReinsuranceTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ReinsuranceDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration