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RESERVE FOR LOSSES AND LOSS EXPENSES (Tables)

12 Months Ended

Dec. 31, 2023

Insurance Loss Reserves [Abstract]

Summary of Reserve for Losses and Loss Expenses

Reserve for losses and loss expenses comprise the following:

			At December 31,			2023						2022
			Reserve for reported losses and loss expenses			$	5,559,261					$	5,555,865
			Reserve for losses incurred but not reported			10,874,757						9,612,998
			Reserve for losses and loss expenses			$	16,434,018					$	15,168,863

Summary of Reconciliation of Beginning and Ending Gross Reserve for Losses and Loss Expenses and Net Reserve for Unpaid Losses and Loss Expenses

The following table presents a reconciliation of the Company's beginning and ending gross reserves for losses and loss expenses and net reserves for unpaid losses and loss expenses:

			Year ended December 31,			2023						2022						2021
			Gross reserve for losses and loss expenses, beginning of year			$	15,168,863					$	14,653,094					$	13,926,766
			Less reinsurance recoverable on unpaid losses and loss expenses, beginning of year			(5,831,172)						(5,017,611)						(4,496,641)
			Net reserve for unpaid losses and loss expenses, beginning of year			9,337,691						9,635,483						9,430,125
			Net incurred losses and loss expenses related to:
			Current year			2,981,220						3,267,943						3,041,193
			Prior years			411,882						(25,533)						(32,410)
						3,393,102						3,242,410						3,008,783
			Net paid losses and loss expenses related to:
			Current year			(488,016)						(457,857)						(490,011)
			Prior years			(2,185,588)						(2,397,213)						(2,274,240)
						(2,673,604)						(2,855,070)						(2,764,251)
			Foreign exchange and other			53,746						(685,132)						(39,174)
			Net reserve for unpaid losses and loss expenses, end of year			10,110,935						9,337,691						9,635,483
			Reinsurance recoverable on unpaid losses and loss expenses, end of year			6,323,083						5,831,172						5,017,611
			Gross reserve for losses and loss expenses, end of year			$	16,434,018					$	15,168,863					$	14,653,094

Summary of Prior Year Loss Development

The following table presents net prior year reserve development by segment:

						Favorable (Adverse)
						Insurance						Reinsurance						Total
			Year ended December 31, 2023			$	(176,353)					$	(235,529)					$	(411,882)
			Year ended December 31, 2022			$	16,350					$	9,183					$	25,533
			Year ended December 31, 2021			$	18,360					$	14,049					$	32,410

The following sections provide further details on net prior year reserve development by segment, line of business and accident year.

Insurance Segment:

						Favorable (Adverse)
			Years ended December 31,			2023						2022						2021
			Property			$	16,195					$	52,512					$	71,032
			Accident and health			(10,236)						(12,856)						15,844
			Marine and aviation			26,977						27,927						42,535
			Cyber			35,579						8,416						(7,329)
			Professional lines			(41,243)						(29,093)						(71,258)
			Credit and political risk			31,691						24,361						10,363
			Liability			(235,316)						(54,917)						(42,827)
			Total			$	(176,353)					$	16,350					$	18,360

Reinsurance Segment:

						Favorable (Adverse)
			Years ended December 31,			2023						2022						2021
			Accident and health			$	29,947					$	14,199					$	5,861
			Agriculture			10,781						11,703						423
			Marine and aviation			12,595						2,597						(10,767)
			Professional lines			(92,181)						(54,820)						(23,718)
			Credit and surety			8,306						43,567						3,436
			Motor			(9,653)						18,161						43,968
			Liability			(262,114)						(58,148)						(17,919)
			Run-off lines
			Catastrophe			46,297						(504)						(36)
			Property			15,225						42,523						17,651
			Engineering			5,268						(10,095)						(4,850)
			Total run-off lines			66,790						31,924						12,765
			Total			$	(235,529)					$	9,183					$	14,049

Summary of Net Incurred and Paid Claims Development Tables by Accident Year

Insurance property
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims			Cumulative number of reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	289,270		$	287,431		$	277,183		$	262,701		$	262,173		$	259,792		$	255,887		$	253,279		$	253,203		$	253,414		$	775		4,174
2015						207,711			200,398			192,736			190,310			186,952			189,066			179,075			181,323			181,928			85			4,194
2016									263,762			287,858			279,532			265,152			259,319			260,370			259,786			264,976			1,951			6,668
2017												794,042			700,638			688,755			679,243			675,085			675,409			669,951			6,375			10,096
2018															608,422			639,465			618,888			611,057			609,977			600,596			12,492			9,659
2019																		374,678			364,350			359,092			369,962			353,671			4,503			9,561
2020																					654,495			635,344			584,921			593,780			24,336			12,417
2021																								378,554			375,607			372,223			9,213			7,730
2022																											414,743			419,139			49,138			7,410
2023																														399,165			188,657			5,732
																											Total			$	4,108,843

Insurance property
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	100,736		$	201,931		$	244,372		$	250,321		$	254,051		$	254,858		$	251,701		$	252,772		$	252,787		$	252,526
2015						67,621			145,027			166,211			179,727			179,409			186,010			177,227			182,038			181,716
2016									82,583			206,979			243,050			250,662			250,822			256,476			253,891			260,115
2017												190,861			513,044			622,040			650,218			645,841			635,493			647,610
2018															221,345			468,431			563,191			573,034			590,739			577,000
2019																		148,181			257,515			306,415			343,463			332,848
2020																					182,611			425,893			481,646			531,448
2021																								134,273			286,801			323,656
2022																											97,622			262,381
2023																														90,855
Total																														3,460,155
All outstanding liabilities before 2014, net of reinsurance																														14,248
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	662,936

Insurance accident and health
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims			Cumulative number of reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	71,520		$	67,380		$	66,874		$	65,347		$	64,973		$	65,710		$	64,938		$	64,070		$	62,703		$	64,392		$	1,621		58,081
2015						70,622			69,494			66,013			64,219			64,771			64,441			63,772			64,433			61,759			1,049			44,138
2016									85,244			85,892			86,338			87,470			87,154			88,180			87,972			87,399			2,179			87,001
2017												113,921			121,146			118,949			117,050			117,131			117,012			118,125			36			688,000
2018															111,119			115,977			115,077			113,118			114,134			114,844			291			745,012
2019																		73,926			75,093			65,623			69,203			68,344			121			675,634
2020																					69,679			63,963			67,525			64,297			1,275			718,512
2021																								69,543			72,044			78,478			3,605			433,643
2022																											98,796			100,629			9,807			380,675
2023																														172,795			67,393			222,537
																											Total			$	931,062

Insurance accident and health
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	31,662		$	56,693		$	60,682		$	61,855		$	62,513		$	62,844		$	62,716		$	61,588		$	61,996		$	62,660
2015						31,518			56,988			60,168			61,051			62,065			61,926			62,584			62,677			60,575
2016									41,583			79,237			83,077			83,929			85,010			85,413			86,123			85,272
2017												63,285			109,312			114,555			115,981			117,100			116,280			118,138
2018															61,849			106,748			109,194			112,884			113,787			114,595
2019																		45,133			61,526			63,046			68,088			68,030
2020																					36,317			52,290			60,804			59,240
2021																								39,185			61,593			69,661
2022																											46,568			82,209
2023																														95,951
Total																														816,331
All outstanding liabilities before 2014, net of reinsurance																														(238)
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	114,493

Insurance marine and aviation
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims			Cumulative number of reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	80,064		$	66,878		$	71,051		$	64,768		$	65,913		$	63,693		$	55,526		$	53,013		$	52,286		$	52,308		$	830		3,566
2015						187,067			165,908			161,465			153,737			140,673			146,174			145,447			145,394			143,900			111			4,312
2016									115,520			111,878			109,478			101,928			101,351			100,488			101,388			102,345			2,038			4,836
2017												262,628			229,801			227,355			225,397			217,443			217,232			215,683			6,867			8,577
2018															238,117			255,652			241,715			234,901			228,369			229,903			14,910			8,742
2019																		215,911			210,536			213,480			226,586			224,914			14,884			7,697
2020																					208,542			180,156			163,700			164,808			14,618			6,439
2021																								240,182			221,864			204,483			34,829			6,754
2022																											265,181			257,637			92,387			7,159
2023																														298,845			210,136			5,172
																											Total			$	1,894,826

Insurance marine and aviation
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	10,336		$	22,874		$	36,805		$	39,439		$	48,583		$	52,793		$	53,941		$	48,435		$	50,255		$	50,383
2015						29,498			69,563			125,369			130,290			133,087			135,881			142,268			142,437			142,432
2016									22,886			50,976			83,039			90,273			92,239			94,184			97,274			97,951
2017												35,415			106,527			140,126			172,205			180,904			184,824			196,724
2018															47,525			123,434			159,948			173,667			185,455			197,961
2019																		54,028			103,253			145,927			171,372			178,967
2020																					44,655			84,391			106,403			119,063
2021																								26,924			69,687			108,772
2022																											30,101			101,228
2023																														36,613
Total																														1,230,094
All outstanding liabilities before 2014, net of reinsurance																														13,750
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	678,482

Insurance cyber
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims			Cumulative number of reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	70,557		$	69,690		$	69,955		$	57,876		$	47,342		$	42,887		$	39,516		$	43,576		$	39,832		$	40,743		$	604		1,159
2015						65,231			63,595			63,066			51,250			50,357			50,758			52,526			49,795			48,042			2,046			1,427
2016									58,741			56,565			58,261			40,266			37,322			29,929			27,873			25,258			1,072			1,667
2017												53,187			50,794			56,783			51,931			50,905			48,685			48,333			3,234			1,817
2018															33,429			31,966			33,962			31,111			26,732			24,495			4,574			2,152
2019																		54,444			58,717			81,982			82,006			73,152			14,109			2,900
2020																					114,209			106,333			103,175			126,457			25,132			2,856
2021																								125,460			134,382			105,642			20,662			2,432
2022																											129,361			120,494			71,510			1,730
2023																														128,252			102,582			1,503
																											Total			$	740,868

Insurance cyber
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	3,136		$	12,162		$	23,330		$	29,962		$	31,260		$	33,819		$	33,732		$	35,440		$	36,070		$	38,043
2015						5,572			15,333			25,544			28,501			30,865			39,470			42,515			43,635			45,432
2016									1,348			4,637			14,141			18,502			21,333			23,136			23,207			24,054
2017												9,354			19,165			28,331			35,897			38,031			40,557			39,995
2018															2,171			7,327			9,874			14,810			19,267			18,334
2019																		2,787			20,950			32,608			60,961			57,318
2020																					17,732			50,344			63,813			82,625
2021																								24,108			65,577			75,369
2022																											7,830			37,861
2023																														9,237
Total																														428,268
All outstanding liabilities before 2014, net of reinsurance																														9,471
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	322,071

Insurance professional lines
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims			Cumulative number of reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	338,378		$	338,670		$	348,064		$	331,044		$	321,027		$	308,193		$	305,201		$	304,657		$	301,289		$	305,060		$	35,601		8,881
2015						309,864			310,926			317,455			304,062			291,176			274,091			272,909			283,894			282,238			20,475			9,341
2016									288,595			293,399			297,852			316,592			329,270			339,513			340,465			356,814			32,954			10,590
2017												339,231			343,055			376,569			376,993			394,154			392,002			396,732			53,138			12,605
2018															325,926			342,931			392,819			423,162			449,212			468,504			76,008			15,333
2019																		347,810			363,998			378,899			412,150			460,120			83,773			14,606
2020																					322,386			321,530			302,097			293,935			130,739			9,318
2021																								378,660			369,587			326,128			198,067			8,127
2022																											461,196			447,359			371,912			8,041
2023																														441,477			414,023			7,251
																											Total			$	3,778,367

Insurance professional lines
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	20,263		$	57,536		$	105,155		$	160,677		$	190,560		$	206,982		$	216,811		$	238,969		$	244,776		$	253,033
2015						14,353			51,709			111,149			139,574			171,000			200,892			213,465			225,062			249,916
2016									14,428			66,048			131,831			172,360			210,701			235,136			276,175			290,732
2017												11,515			51,823			109,107			167,645			198,859			269,668			291,943
2018															18,446			74,859			143,248			204,941			265,501			336,329
2019																		25,061			76,711			133,453			206,462			289,475
2020																					8,729			44,076			97,847			125,713
2021																								9,781			38,605			83,605
2022																											10,983			46,224
2023																														12,183
Total																														1,979,153
All outstanding liabilities before 2014, net of reinsurance																														131,134
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	1,930,348

Insurance credit and political risk
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims			Cumulative number of reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	38,825		$	70,712		$	67,109		$	68,323		$	69,589		$	71,274		$	70,748		$	69,113		$	69,677		$	69,677		$	—		6
2015						30,329			30,368			27,524			26,012			25,930			24,851			24,189			23,309			23,309			—			2
2016									45,006			45,079			42,589			43,160			26,946			25,965			24,885			24,885			—			2
2017												48,181			32,808			26,044			18,269			16,022			11,068			8,566			2,086			4
2018															42,976			33,747			32,738			24,845			21,182			24,356			5,584			2
2019																		53,332			81,470			75,610			74,066			71,270			11,546			31
2020																					61,928			70,428			62,235			50,987			19,594			43
2021																								42,417			37,104			26,322			13,363			23
2022																											45,444			44,450			37,463			24
2023																														59,258			54,333			19
																											Total			$	403,080

Insurance credit and political risk
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	1,924		$	39,952		$	61,108		$	57,857		$	57,857		$	64,050		$	70,224		$	70,224		$	69,677		$	69,677
2015						—			23,309			23,309			23,309			23,309			23,309			23,309			23,309			23,309
2016									—			24,885			24,885			24,885			24,885			24,885			24,885			24,885
2017												403			4,035			9,251			11,710			10,925			10,394			8,666
2018															5,370			13,488			15,517			11,851			19,963			23,841
2019																		16,026			46,456			53,750			56,956			55,067
2020																					9,825			90,299			58,492			53,786
2021																								2,769			(370)			8,228
2022																											2,796			8,115
2023																														2,743
Total																														278,317
All outstanding liabilities before 2014, net of reinsurance																														592
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	125,355

Insurance liability
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims			Cumulative number of reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	107,126		$	124,289		$	129,750		$	130,666		$	132,013		$	131,469		$	132,565		$	132,043		$	132,474		$	131,210		$	9,697		5,820
2015						128,436			127,299			137,477			164,982			182,690			188,004			186,931			188,261			189,795			18,423			6,769
2016									124,313			130,160			128,854			127,451			120,199			120,187			125,614			124,969			17,081			7,648
2017												167,334			166,052			184,781			200,391			204,533			214,707			250,887			37,518			8,812
2018															167,552			167,672			190,639			204,519			216,038			251,875			38,901			8,644
2019																		192,468			193,435			222,885			238,035			300,584			66,863			8,183
2020																					224,616			225,038			230,921			249,189			88,543			6,180
2021																								232,051			245,585			302,023			141,022			6,748
2022																											323,261			357,574			246,679			7,365
2023																														364,604			331,464			5,168
																											Total			$	2,522,710

Insurance liability
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	1,411		$	18,633		$	49,829		$	71,589		$	84,369		$	93,569		$	103,041		$	106,205		$	113,150		$	116,384
2015						5,438			22,353			39,581			92,598			120,136			140,809			150,640			159,004			162,656
2016									6,315			23,260			36,356			56,403			66,290			79,519			95,787			102,773
2017												5,463			29,432			58,988			115,568			143,440			168,615			190,475
2018															9,374			34,860			72,219			119,152			158,622			188,910
2019																		7,833			39,846			83,692			139,077			192,435
2020																					8,148			25,174			75,907			118,306
2021																								13,397			51,859			103,892
2022																											13,212			53,507
2023																														9,855
Total																														1,239,193
All outstanding liabilities before 2014, net of reinsurance																														49,217
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	1,332,734

Reinsurance accident and health
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims
Accident Year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	101,409		$	102,403		$	89,303		$	86,833		$	86,843		$	86,846		$	87,806		$	88,095		$	87,978		$	87,664		$	125
2015						93,831			100,522			94,047			93,807			93,081			93,422			92,431			92,388			93,133			105
2016									170,687			191,299			188,454			190,067			189,538			190,574			190,534			190,662			16
2017												183,937			189,610			183,574			182,477			183,513			183,484			182,479			(16)
2018															193,749			200,576			198,365			201,133			200,467			197,493			766
2019																		217,477			212,307			207,794			205,403			199,419			1,328
2020																					226,883			220,969			213,960			199,958			1,757
2021																								232,091			227,326			222,718			9,765
2022																											267,525			264,615			40,396
2023																														243,174			91,280
																											Total			$	1,881,315

Reinsurance accident and health
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident Year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	36,571		$	79,974		$	85,931		$	86,332		$	86,534		$	86,622		$	87,302		$	86,384		$	86,771		$	87,202
2015						23,409			77,316			88,728			91,935			92,036			92,497			93,921			93,735			92,468
2016									50,046			149,959			181,072			187,251			189,234			188,836			189,815			189,409
2017												79,252			157,157			172,111			178,943			179,462			180,121			179,889
2018															72,899			165,323			191,832			191,400			194,524			195,018
2019																		67,810			169,608			195,954			196,694			194,800
2020																					81,875			172,178			210,665			192,491
2021																								68,652			179,626			210,115
2022																											101,596			214,611
2023																														130,949
Total																														1,686,952
All outstanding liabilities before 2014, net of reinsurance																														(213)
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	194,150

Reinsurance agriculture
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims
Accident Year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	183,260		$	164,351		$	162,820		$	162,388		$	162,314		$	162,327		$	162,245		$	162,068		$	162,762		$	162,927		$	482
2015						103,199			95,608			95,346			95,332			95,339			95,516			95,503			95,634			96,251			(27)
2016									124,229			117,960			111,045			109,633			109,863			109,068			109,012			109,763			(72)
2017												151,768			144,401			138,439			139,510			138,984			137,516			136,658			(60)
2018															141,040			147,359			140,883			140,618			139,989			142,760			646
2019																		185,560			185,345			187,770			183,384			183,092			93
2020																					62,678			62,837			63,874			61,986			1,130
2021																								69,823			61,437			57,857			6,144
2022																											101,082			91,534			16,972
2023																														103,489			81,193
																											Total			$	1,146,317

Reinsurance agriculture
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident Year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	15,615		$	133,137		$	162,349		$	161,575		$	161,498		$	162,011		$	160,516		$	161,167		$	162,068		$	162,194
2015						1,716			65,870			92,979			94,535			94,873			95,468			95,457			95,612			96,224
2016									9,489			62,530			108,378			109,922			109,410			109,172			109,211			109,762
2017												7,444			124,528			137,502			138,640			137,482			137,429			136,605
2018															5,115			127,577			135,674			141,768			138,398			144,070
2019																		28,854			154,533			174,250			178,264			177,760
2020																					17,454			47,377			54,269			55,359
2021																								2,953			32,846			46,117
2022																											15,347			55,508
2023																														14,633
Total																														998,232
All outstanding liabilities before 2014, net of reinsurance																														(463)
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	147,622

Reinsurance marine and aviation
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims
Accident Year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	10,192		$	9,162		$	8,019		$	7,209		$	9,192		$	8,535		$	8,786		$	9,025		$	9,530		$	9,841		$	368
2015						10,366			9,242			10,836			15,019			12,652			12,281			12,046			11,998			12,054			527
2016									32,453			35,965			36,130			37,519			36,052			36,371			36,773			36,263			52
2017												55,299			42,961			41,363			46,612			43,243			40,900			40,827			43
2018															18,906			27,454			27,006			43,540			47,066			48,477			35
2019																		69,806			82,194			79,801			81,628			84,756			5,560
2020																					40,298			41,766			37,892			37,098			308
2021																								43,763			40,830			35,672			2,976
2022																											68,907			59,227			32,375
2023																														40,951			34,539
																											Total			$	405,166

Reinsurance marine and aviation
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident Year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	1,121		$	2,307		$	4,388		$	5,256		$	6,320		$	6,499		$	7,003		$	7,370		$	7,563		$	8,477
2015						416			2,665			6,443			8,662			10,220			11,017			10,843			10,925			11,058
2016									2,765			19,544			26,673			30,619			33,399			34,450			35,044			35,256
2017												2,803			23,620			28,954			33,912			36,978			37,091			37,996
2018															1,783			10,880			24,325			30,763			34,435			37,829
2019																		10,763			27,167			34,317			52,763			67,800
2020																					4,024			16,730			24,006			29,862
2021																								5,478			12,341			20,486
2022																											7,817			18,588
2023																														1,473
Total																														268,825
All outstanding liabilities before 2014, net of reinsurance																														1,923
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	138,264

Reinsurance professional lines
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	219,162		$	219,123		$	219,052		$	218,847		$	233,169		$	229,556		$	228,193		$	226,234		$	234,311		$	246,043		$	13,578
2015						211,820			211,774			213,993			224,649			231,352			228,410			235,131			241,113			252,022			16,515
2016									195,019			196,073			199,715			227,468			255,088			255,012			266,979			278,699			26,195
2017												154,889			155,470			161,694			177,819			187,761			210,303			239,324			38,070
2018															145,994			148,458			155,390			165,981			173,954			195,575			24,160
2019																		138,048			137,723			141,610			146,088			157,572			36,200
2020																					140,886			141,559			136,107			134,478			69,314
2021																								148,950			140,737			136,381			93,845
2022																											169,576			153,853			125,013
2023																														136,051			124,516
																											Total			$	1,929,998

Reinsurance professional lines
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	2,019		$	13,062		$	48,791		$	74,479		$	109,048		$	146,917		$	158,388		$	178,058		$	189,874		$	196,444
2015						3,134			13,504			41,512			79,208			111,743			131,543			152,328			170,555			184,073
2016									1,765			20,487			52,540			95,084			124,881			153,575			181,141			202,925
2017												2,813			14,871			39,857			62,723			88,791			116,293			137,492
2018															271			2,572			31,198			56,882			81,729			113,771
2019																		368			13,614			33,628			53,221			76,094
2020																					3,823			13,969			26,926			40,718
2021																								4,337			11,366			22,619
2022																											3,234			11,713
2023																														3,435
Total																														989,284
All outstanding liabilities before 2014, net of reinsurance																														113,403
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	1,054,117

Reinsurance credit and surety
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	134,434		$	134,527		$	141,621		$	137,973		$	126,744		$	125,477		$	121,780		$	120,482		$	120,790		$	111,511		$	1,914
2015						159,274			164,350			159,148			155,217			136,568			137,528			138,726			132,989			129,333			1,447
2016									140,892			140,188			147,955			122,495			114,957			112,631			110,316			112,465			35
2017												137,832			131,630			125,763			117,044			114,412			114,131			114,612			2,647
2018															111,022			119,227			113,535			110,531			105,503			94,229			4,053
2019																		74,101			67,825			67,759			65,573			57,322			6,315
2020																					76,917			83,559			68,987			94,943			8,385
2021																								52,005			43,967			41,463			13,732
2022																											63,653			51,231			33,129
2023																														86,367			64,350
																											Total			$	893,476

Reinsurance credit and surety
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	35,450		$	60,597		$	85,266		$	94,274		$	101,859		$	106,267		$	106,708		$	106,519		$	107,713		$	98,533
2015						32,863			81,001			98,709			115,549			117,462			121,115			121,975			120,617			118,116
2016									41,937			72,691			91,490			101,065			102,149			100,682			100,426			102,558
2017												37,246			73,362			89,715			101,337			99,463			102,390			103,252
2018															38,868			67,839			72,096			83,736			85,505			87,073
2019																		19,301			30,985			44,702			46,835			49,050
2020																					25,339			34,050			39,495			43,888
2021																								4,471			9,170			17,175
2022																											6,883			11,302
2023																														10,335
Total																														641,282
All outstanding liabilities before 2014, net of reinsurance																														26,307
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	278,501

Reinsurance motor
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	181,056		$	180,792		$	175,983		$	173,139		$	168,796		$	165,481		$	162,212		$	161,835		$	162,730		$	161,844		$	2,346
2015						221,182			215,201			219,055			220,820			209,908			208,620			205,780			206,090			204,673			8,979
2016									244,395			259,912			261,592			251,675			243,353			240,717			244,553			245,098			4,366
2017												361,782			368,517			357,741			358,286			359,026			354,392			361,134			22,422
2018															355,561			353,384			364,664			360,907			348,323			361,117			17,400
2019																		338,031			336,957			337,404			328,522			332,952			12,894
2020																					215,257			218,224			215,572			197,439			10,872
2021																								180,372			182,010			184,244			25,813
2022																											160,697			173,870			35,986
2023																														125,498			60,323
																											Total			$	2,347,869

Reinsurance motor
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	43,148		$	73,129		$	92,183		$	100,071		$	109,989		$	119,355		$	114,654		$	135,455		$	138,281		$	141,456
2015						57,638			92,382			112,128			129,175			144,878			145,593			168,295			173,373			175,479
2016									60,689			103,868			127,404			145,160			158,004			182,077			189,563			198,144
2017												72,143			133,447			163,724			198,778			221,060			244,440			262,741
2018															83,831			141,391			205,874			215,988			240,535			260,818
2019																		90,328			183,841			201,210			223,167			242,207
2020																					43,752			96,208			115,689			127,881
2021																								41,869			76,338			94,500
2022																											35,213			52,971
2023																														26,040
Total																														1,582,237
All outstanding liabilities before 2014, net of reinsurance																														255,320
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	1,020,952

Reinsurance liability
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	199,575		$	202,526		$	204,240		$	200,138		$	198,893		$	196,747		$	187,245		$	183,101		$	189,047		$	193,578		$	14,361
2015						214,346			214,689			215,633			215,461			213,256			213,485			203,268			206,204			217,019			22,070
2016									239,971			245,286			250,247			253,525			263,195			267,241			274,615			315,793			46,678
2017												275,306			270,080			279,262			287,818			297,380			306,648			343,290			62,419
2018															264,003			268,812			274,110			286,876			307,032			352,697			72,183
2019																		263,522			272,513			274,393			272,905			331,729			103,836
2020																					283,606			284,216			278,743			306,011			148,977
2021																								304,160			311,735			346,161			185,421
2022																											347,387			343,773			232,850
2023																														275,232			241,263
																											Total			$	3,025,283

Reinsurance liability
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	7,075		$	28,652		$	48,397		$	70,069		$	89,328		$	109,859		$	129,802		$	137,103		$	148,342		$	156,421
2015						7,269			27,451			54,486			80,822			108,857			130,767			141,519			151,919			166,842
2016									11,868			37,666			69,445			111,698			142,837			166,645			189,536			216,534
2017												12,449			42,144			78,574			120,747			158,653			193,274			224,655
2018															19,357			49,938			85,207			127,946			166,378			207,016
2019																		19,311			45,269			79,728			120,266			159,068
2020																					16,940			49,059			82,389			119,678
2021																								10,931			58,540			99,228
2022																											18,066			52,197
2023																														15,003
Total																														1,416,642
All outstanding liabilities before 2014, net of reinsurance																														130,039
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	1,738,680

Reinsurance run-off
			Incurred claims and allocated claim adjustment expenses, net of reinsurance																														At December 31, 2023
			For the years ended December 31,																														Total of incurred-but-not-reported liabilities plus expected development on reported claims
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	242,347		$	246,616		$	236,768		$	227,865		$	224,135		$	223,970		$	219,953		$	219,748		$	218,896		$	219,012		$	201
2015						267,709			256,648			256,665			247,377			246,266			251,245			249,050			247,183			244,790			475
2016									286,264			285,973			282,705			277,349			280,836			281,204			281,137			274,291			2,838
2017												705,205			702,378			740,074			741,278			739,258			729,812			722,172			19,886
2018															523,351			614,222			628,722			614,573			600,516			600,640			15,506
2019																		448,745			432,299			411,886			395,134			387,944			17,304
2020																					520,537			553,538			548,846			553,124			41,243
2021																								430,820			441,530			438,082			39,301
2022																											265,797			225,697			47,820
2023																														64,191			28,272
																											Total			$	3,729,943

Reinsurance run-off
			Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance
			For the years ended December 31,
Accident year			2014 unaudited			2015 unaudited			2016 unaudited			2017 unaudited			2018 unaudited			2019 unaudited			2020 unaudited			2021 unaudited			2022 unaudited			2023
2014			$	49,217		$	136,404		$	180,580		$	197,284		$	202,114		$	206,234		$	203,726		$	210,435		$	211,708		$	213,063
2015						46,199			119,103			178,596			203,661			213,978			218,469			232,671			234,318			235,258
2016									65,343			141,975			201,290			232,366			246,602			253,543			258,939			257,802
2017												163,254			417,693			528,640			586,833			611,106			646,826			657,803
2018															116,816			331,848			427,126			479,911			526,746			548,005
2019																		54,985			214,066			274,503			310,612			335,546
2020																					105,245			240,193			324,105			392,613
2021																								87,860			235,617			302,383
2022																											50,250			103,881
2023																														22,862
Total																														3,069,216
All outstanding liabilities before 2014, net of reinsurance																														37,075
Liabilities for claims and claim adjustment expenses, net of reinsurance																														$	697,802

Summary of Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance

Insurance property
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
32.9%			41.2%			13.4%			5.3%			0.1%			0.4%			(1.3%)			1.8%			(0.1%)			(0.1%)

Insurance accident and health
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
53.0%			34.9%			6.0%			1.9%			0.9%			0.2%			0.8%			(0.9%)			(1.4%)			1.0%

Insurance marine and aviation
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
18.8%			26.6%			22.5%			7.9%			5.6%			3.8%			3.8%			(3.2%)			1.8%			0.2%

Insurance cyber
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
10.7%			23.5%			19.0%			18.5%			6.2%			6.5%			1.3%			3.3%			2.6%			4.8%

Insurance professional lines
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
3.9%			11.3%			16.1%			13.3%			11.7%			11.1%			6.2%			5.2%			5.4%			2.7%

Insurance credit and political risk
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
9.3%			59.0%			10.0%			0.6%			3.6%			3.7%			(2.8%)			—%			(0.4%)			—%

Insurance liability
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
3.2%			10.8%			15.3%			19.6%			12.8%			10.1%			8.5%			4.1%			3.6%			2.5%

Reinsurance accident and health
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
37.1%			48.7%			12.9%			0.3%			0.4%			0.2%			0.7%			(0.5%)			(0.5%)			0.5%

Reinsurance agriculture
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
10.9%			63.5%			18.5%			1.7%			(0.6%)			0.9%			(0.4%)			0.4%			0.6%			0.1%

Reinsurance marine and aviation
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
8.9%			26.4%			20.5%			14.4%			10.7%			3.7%			1.9%			1.7%			1.6%			9.3%

Reinsurance professional lines
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
1.5%			5.3%			11.6%			12.3%			12.6%			12.3%			7.9%			7.7%			5.1%			2.7%

Reinsurance credit and surety
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
26.5%			22.1%			15.0%			8.6%			2.3%			2.0%			0.4%			0.2%			(0.4%)			(8.2%)

Reinsurance motor
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
23.6%			18.8%			10.3%			6.5%			6.3%			5.6%			4.1%			6.3%			1.4%			2.0%

Reinsurance liability
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
4.5%			9.8%			10.8%			12.2%			11.1%			10.0%			7.9%			5.7%			6.4%			4.2%

Reinsurance run-off
Average annual percentage payout of incurred claims by age, net of reinsurance (unaudited)
Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10
21.8%			32.4%			17.9%			9.7%			4.9%			2.9%			2.1%			1.1%			0.5%			0.6%

Summary of Reconciliation of Development Tables to Consolidated Balance Sheet

The following table reconciles the reserve for losses and loss expenses at December 31, 2023, included in the loss development tables to the reserve for losses and loss expenses reported in the consolidated balance sheet:

Reconciliation of the disclosure of incurred and paid claims development to the liability for unpaid claims and claim adjustment expenses
						At December 31, 2023
						Net outstanding liabilities						Reinsurance recoverable on unpaid claims						Gross outstanding liabilities
Insurance segment
Property						$	662,936					$	402,222					$	1,065,158
Accident and health						114,493						3,006						117,499
Marine and aviation						678,482						278,215						956,697
Cyber						322,071						430,627						752,698
Professional lines						1,930,348						1,442,546						3,372,894
Credit and political risk						125,355						35,191						160,546
Liability						1,332,734						1,885,232						3,217,966
Total insurance segment						5,166,419						4,477,039						9,643,458
Reinsurance segment
Accident and health						194,150						49,314						243,464
Agriculture						147,622						8,343						155,965
Marine and aviation						138,264						33,185						171,449
Professional lines						1,054,117						370,345						1,424,462
Credit and surety						278,501						103,174						381,675
Motor						1,020,952						315,344						1,336,296
Liability						1,738,680						690,141						2,428,821
Run-off lines						697,802						276,198						974,000
Total reinsurance segment						5,270,088						1,846,044						7,116,132
Total						$	10,436,507					$	6,323,083					16,759,590
Unallocated claims adjustment expenses																		183,260
Foreign exchange and other(1)																		12,442
Ceded reserves related to retroactive transactions																		(521,274)
Total liability for unpaid claims and claims adjustment expense																		$	16,434,018

(1)    Non-U.S. dollar denominated loss data is converted to U.S dollar at the rates of exchange in effect at the balance sheet date for material underlying currencies. Fluctuations in currency exchange rates may cause material shifts in loss development. Reserves for losses and loss expenses disclosed in the consolidated balance sheets are also remeasured using rates of exchange in effect at the balance sheet date.

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