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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Cost and Fair Values of Fixed Maturities

The following table provides the amortized cost and fair values of the Company's fixed maturities classified as available for sale:

						Amortized cost						Allowance for expected credit losses						Gross unrealized gains						Gross unrealized losses						Fair value
			At December 31, 2023
			Available for sale
			U.S. government and agency			$	3,049,445					$	—					$	13,211					$	(55,128)					$	3,007,528
			Non-U.S. government			729,761						(30)						13,089						(18,861)						723,959
			Corporate debt			4,651,654						(10,438)						49,434						(216,478)						4,474,172
			Agency RMBS(1)			1,706,204						—						11,495						(83,038)						1,634,661
			CMBS(2)			897,553						—						551						(58,408)						839,696
			Non-agency RMBS			165,910						(194)						713						(13,033)						153,396
			ABS(3)			1,265,187						(50)						2,855						(25,021)						1,242,971
			Municipals(4)			168,540						(47)						414						(10,548)						158,359
			Total fixed maturities, available for sale			$	12,634,254					$	(10,759)					$	91,762					$	(480,515)					$	12,234,742
			At December 31, 2022
			Available for sale
			U.S. government and agency			$	2,731,733					$	—					$	5,386					$	(97,789)					$	2,639,330
			Non-U.S. government			612,546						—						2,395						(52,912)						562,029
			Corporate debt			4,680,798						(11,521)						5,269						(418,990)						4,255,556
			Agency RMBS(1)			1,297,423						—						4,663						(99,301)						1,202,785
			CMBS(2)			1,029,863						—						60						(82,145)						947,778
			Non-agency RMBS			151,907						(123)						275						(18,525)						133,534
			ABS(3)			1,499,728						(35)						555						(70,721)						1,429,527
			Municipals(4)			172,475						(54)						139						(16,205)						156,355
			Total fixed maturities, available for sale			$	12,176,473					$	(11,733)					$	18,742					$	(856,588)					$	11,326,894

(1)Residential mortgage-backed securities ("RMBS") originated by U.S. government-sponsored agencies.

(2)Commercial mortgage-backed securities ("CMBS").

(3)Asset-backed securities ("ABS") include debt tranched securities collateralized primarily by auto loans, student loans, credit card receivables and collateralized loan obligations ("CLOs").

(4)Municipals include bonds issued by states, municipalities and political subdivisions.

Summary of Contractual Maturities of Fixed Maturities

The table below provides the contractual maturities of fixed maturities classified as available for sale:

						Amortized cost						Fair value						% of Total fair value
			At December 31, 2023
			Maturity
			Due in one year or less			$	474,557					$	463,789					3.6		%
			Due after one year through five years			5,902,571						5,790,493						47.3		%
			Due after five years through ten years			2,064,619						1,954,449						16.0		%
			Due after ten years			157,653						155,287						1.3		%
						8,599,400						8,364,018						68.2		%
			Agency RMBS			1,706,204						1,634,661						13.4		%
			CMBS			897,553						839,696						6.9		%
			Non-agency RMBS			165,910						153,396						1.3		%
			ABS			1,265,187						1,242,971						10.2		%
			Total			$	12,634,254					$	12,234,742					100.0		%
			At December 31, 2022
			Maturity
			Due in one year or less			$	422,039					$	409,972					3.7		%
			Due after one year through five years			5,349,123						5,078,273						44.8		%
			Due after five years through ten years			2,192,344						1,919,450						16.9		%
			Due after ten years			234,046						205,575						1.8		%
						8,197,552						7,613,270						67.2		%
			Agency RMBS			1,297,423						1,202,785						10.6		%
			CMBS			1,029,863						947,778						8.4		%
			Non-agency RMBS			151,907						133,534						1.2		%
			ABS			1,499,728						1,429,527						12.6		%
			Total			$	12,176,473					$	11,326,894					100.0		%

Summary of Fixed Maturities and Equities in an Unrealized Loss Position

The following table summarizes fixed maturities, available for sale in an unrealized loss position and the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:

						12 months or greater												Less than 12 months												Total
						Fair value						Unrealized losses						Fair value						Unrealized losses						Fair value						Unrealized losses
			At December 31, 2023
			Fixed maturities, available for sale
			U.S. government and agency			$	846,503					$	(42,465)					$	867,733					$	(12,663)					$	1,714,236					$	(55,128)
			Non-U.S. government			233,038						(18,178)						115,112						(683)						348,150						(18,861)
			Corporate debt			2,623,304						(210,512)						240,813						(5,966)						2,864,117						(216,478)
			Agency RMBS			778,656						(80,070)						218,606						(2,968)						997,262						(83,038)
			CMBS			703,411						(54,856)						75,242						(3,552)						778,653						(58,408)
			Non-agency RMBS			98,483						(13,013)						10,017						(20)						108,500						(13,033)
			ABS			879,743						(24,747)						83,582						(274)						963,325						(25,021)
			Municipals			129,969						(10,156)						6,238						(392)						136,207						(10,548)
			Total fixed maturities, available for sale			$	6,293,107					$	(453,997)					$	1,617,343					$	(26,518)					$	7,910,450					$	(480,515)
			At December 31, 2022
			Fixed maturities, available for sale
			U.S. government and agency			$	467,032					$	(41,365)					$	1,414,181					$	(56,424)					$	1,881,213					$	(97,789)
			Non-U.S. government			207,637						(33,027)						298,048						(19,885)						505,685						(52,912)
			Corporate debt			1,562,355						(268,289)						2,350,504						(150,701)						3,912,859						(418,990)
			Agency RMBS			220,595						(40,469)						771,191						(58,832)						991,786						(99,301)
			CMBS			343,494						(40,888)						599,877						(41,257)						943,371						(82,145)
			Non-agency RMBS			75,137						(14,691)						53,484						(3,834)						128,621						(18,525)
			ABS			685,990						(48,913)						686,190						(21,808)						1,372,180						(70,721)
			Municipals			52,994						(10,120)						96,003						(6,085)						148,997						(16,205)
			Total fixed maturities, available for sale			$	3,615,234					$	(497,762)					$	6,269,478					$	(358,826)					$	9,884,712					$	(856,588)

Summary of Fixed Maturities, Held-to-Maturity

The following table provides the amortized cost and fair values of the Company's fixed maturities classified as held to maturity:

						Amortized cost						Allowance for expected credit losses						Net carrying value						Gross unrealized gains						Gross unrealized losses						Fair value
			At December 31, 2023
			Held to maturity
			Corporate debt			$	95,200					$	—					$	95,200					$	298					$	(8,827)					$	86,671
			ABS(1)			591,096						—						591,096						5						(1,921)						589,180
			Total fixed maturities, held to maturity			$	686,296					$	—					$	686,296					$	303					$	(10,748)					$	675,851
			At December 31, 2022
			Held to maturity
			Corporate debt			$	85,200					$	—					$	85,200					$	—					$	(11,428)					$	73,772
			ABS(1)			613,151						—						613,151						—						(12,180)						600,971
			Total fixed maturities, held to maturity			$	698,351					$	—					$	698,351					$	—					$	(23,608)					$	674,743

(1)Asset-backed securities ("ABS") include debt tranched securities collateralized primarily by collateralized loan obligations ("CLOs").

Summary of Cost and Fair Value of Equity Securities

The following table provides the cost and fair values of the Company's equity securities:

						Cost						Gross unrealized gains						Gross unrealized losses						Fair value
			At December 31, 2023
			Equity securities
			Common stocks			$	2,843					$	101					$	(398)					$	2,546
			Preferred stocks			5,496						218						(113)						5,601
			Exchange-traded funds			182,989						105,858						(1,572)						287,275
			Bond mutual funds			352,505						4,119						(63,535)						293,089
			Total equity securities			$	543,833					$	110,296					$	(65,618)					$	588,511
			At December 31, 2022
			Equity securities
			Common stocks			$	7,279					$	636					$	(442)					$	7,473
			Preferred stocks			115						—						(43)						72
			Exchange-traded funds			207,505						68,058						(5,757)						269,806
			Bond mutual funds			279,457						—						(71,555)						207,902
			Total equity securities			$	494,356					$	68,694					$	(77,797)					$	485,253

Summary of Mortgage Loans Net of Valuation Allowance

The following table provides details of the Company's mortgage loans, held for investment:

						December 31, 2023												December 31, 2022
						Carrying value						% of Total						Carrying value						% of Total
			Mortgage loans held for investment:
			Commercial			$	616,368					101		%				$	627,437					100		%
			Allowance for expected credit losses			(6,220)						(1		%)				—						—		%
			Total mortgage loans held for investment			$	610,148					100		%				$	627,437					100		%

Summary of Portfolio of Other Investments

The following table provides a summary of the Company's other investments, together with additional information relating to the liquidity of each category:

						Fair value												Redemption frequency (if currently eligible)						Redemption notice period
			At December 31, 2023
			Multi-strategy funds			$	24,619					3		%				Quarterly						60-90 days
			Direct lending funds			192,270						20		%				Quarterly(1)						90 days
			Private equity funds			301,712						32		%				n/a						n/a
			Real estate funds			317,325						33		%				Quarterly(2), Annually(3)						45-90 days
			CLO-Equities			5,300						1		%				n/a						n/a
			Other privately held investments			108,187						11		%				n/a						n/a
			Total other investments			$	949,413					100		%
			At December 31, 2022
			Multi-strategy funds			$	32,616					3		%				Quarterly						60-90 days
			Direct lending funds			258,626						26		%				Quarterly(1)						90 days
			Private equity funds			265,836						27		%				n/a						n/a
			Real estate funds			298,499						30		%				Quarterly(2), Annually(3)						45-90 days
			CLO-Equities			5,016						—		%				n/a						n/a
			Other privately held investments			136,158						14		%				n/a						n/a
			Total other investments			$	996,751					100		%

n/a – not applicable

(1)Applies to one fund with a fair value of $17 million (2022: $39 million).

(2)Applies to one fund with a fair value of $66 million (2022: $73 million).

(3)Applies to one fund with a fair value of $25 million (2022: $27 million).

Summary of Net Investment Income

Net investment income was derived from the following sources:

			Year ended December 31,			2023						2022						2021
			Fixed maturities			$	514,842					$	329,858					$	262,049
			Other investments			20,411						57,043						181,906
			Equity securities			12,088						10,390						12,752
			Mortgage loans			35,312						23,407						17,427
			Cash and cash equivalents			50,261						20,273						4,454
			Short-term investments			8,924						3,535						664
			Gross investment income			641,838						444,506						479,252
			Investment expenses			(30,096)						(25,677)						(24,951)
			Net investment income			$	611,742					$	418,829					$	454,301

Summary of Net Investment Gains (Losses)

The following table provides an analysis of net investment gains (losses):

			Year ended December 31,			2023						2022						2021
			Gross realized investment gains
			Fixed maturities and short-term investments			$	32,920					$	16,671					$	137,729
			Equity securities			16,847						7,687						5,413
			Gross realized investment gains			49,767						24,358						143,142
			Gross realized investment losses
			Fixed maturities and short-term investments			(158,080)						(328,493)						(42,613)
			Equity securities			(639)						(406)						(696)
			Gross realized investment losses			(158,719)						(328,899)						(43,309)
			(Increase) decrease in allowance for expected credit losses, fixed maturities, available for sale			974						(11,421)						11
			(Increase) decrease in allowance for expected credit losses, mortgage loans			(6,220)						—						—
			Impairment losses(1)			(12,757)						(12,568)						(22)
			Change in fair value of investment derivatives(2)			(1,456)						7,656						4,346
			Net unrealized gains (losses) on equity securities			53,781						(135,915)						30,111
			Net investment gains (losses)			$	(74,630)					$	(456,789)					$	134,279

(1)Related to instances where the Company intends to sell securities or it is more likely than not that the Company will be required to sell securities before their anticipated recovery.

(2)Refer to Note 7 'Derivative Instruments'.

Summary of Allowance for Credit Loss

The following table provides a reconciliation of the beginning and ending balances of the allowance for expected credit losses on fixed maturities classified as available for sale:

			Year ended December 31,			2023						2022						2021
			Balance at beginning of period			$	11,733					$	313					$	323
			Expected credit losses on securities where credit losses were not previously recognized			5,200						17,830						95
			Additions (reductions) for expected credit losses on securities where credit losses were previously recognized			4,934						(3,831)						50
			Impairments of securities which the Company intends to sell or more likely than not will be required to sell			—						—						—
			Securities sold/redeemed/matured			(11,108)						(2,579)						(155)
			Balance at end of period			$	10,759					$	11,733					$	313

Summary of Restricted Investments and Cash

The table below provides the fair values of the Company's restricted investments and cash:

			At December 31,						2023						2022
			Collateral in trust for inter-company agreements						$	614,089					$	790,449
			Collateral for secured letter of credit facility						423,522						424,624
			Funds at Lloyd's						893,177						748,573
			Collateral in trust for third-party agreements						2,597,633						2,491,317
			Securities on deposit or in trust with regulatory authorities						772,472						731,660
			Total restricted investments and cash						$	5,300,893					$	5,186,623

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