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INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2024

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 September 30, 2024
			Available for sale
			U.S. government and agency			$	2,793,879					$	—					$	37,888					$	(20,967)					$	2,810,800
			Non-U.S. government			798,756						(17)						25,806						(7,914)						816,631
			Corporate debt			5,740,096						(4,164)						111,523						(124,069)						5,723,386
			Agency RMBS(1)			1,764,991						—						29,026						(46,954)						1,747,063
			CMBS(2)			839,795						—						3,553						(32,591)						810,757
			Non-agency RMBS			132,009						(190)						1,128						(8,502)						124,445
			ABS(3)			1,582,069						(51)						11,689						(8,605)						1,585,102
			Municipals(4)			155,197						—						1,138						(6,326)						150,009
			Total fixed maturities, available for sale			$	13,806,792					$	(4,422)					$	221,751					$	(255,928)					$	13,768,193
			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

(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 September 30, 2024
			Maturity
			Due in one year or less			$	752,064					$	748,123					5.5		%
			Due after one year through five years			6,089,410						6,132,217						44.5		%
			Due after five years through ten years			2,408,029						2,380,767						17.3		%
			Due after ten years			238,425						239,719						1.7		%
						9,487,928						9,500,826						69.0		%
			Agency RMBS			1,764,991						1,747,063						12.7		%
			CMBS			839,795						810,757						5.9		%
			Non-agency RMBS			132,009						124,445						0.9		%
			ABS			1,582,069						1,585,102						11.5		%
			Total			$	13,806,792					$	13,768,193					100.0		%
			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		%

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 September 30, 2024
			Fixed maturities, available for sale
			U.S. government and agency			$	427,033					$	(20,361)					$	259,245					$	(606)					$	686,278					$	(20,967)
			Non-U.S. government			150,570						(7,512)						17,874						(402)						168,444						(7,914)
			Corporate debt			1,878,476						(117,310)						361,048						(6,759)						2,239,524						(124,069)
			Agency RMBS			653,678						(46,088)						113,908						(866)						767,586						(46,954)
			CMBS			641,584						(32,567)						9,869						(24)						651,453						(32,591)
			Non-agency RMBS			74,745						(8,497)						1,166						(5)						75,911						(8,502)
			ABS			209,382						(8,532)						73,236						(73)						282,618						(8,605)
			Municipals			117,076						(6,307)						1,474						(19)						118,550						(6,326)
			Total fixed maturities, available for sale			$	4,152,544					$	(247,174)					$	837,820					$	(8,754)					$	4,990,364					$	(255,928)
			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)

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 September 30, 2024
			Held to maturity
			Corporate debt			$	123,992					$	—					$	123,992					$	1,654					$	(6,327)					$	119,319
			ABS(1)			379,784						—						379,784						566						(131)						380,219
			Total fixed maturities, held to maturity			$	503,776					$	—					$	503,776					$	2,220					$	(6,458)					$	499,538
			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

(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 September 30, 2024
			Equity securities
			Common stocks			$	2,843					$	76					$	(418)					$	2,501
			Preferred stocks			5,843						341						(100)						6,084
			Exchange-traded funds			188,625						125,072						(473)						313,224
			Bond mutual funds			320,779						4,896						(42,650)						283,025
			Total equity securities			$	518,090					$	130,385					$	(43,641)					$	604,834
			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

Summary of Mortgage Loans Net of Valuation Allowance

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

						September 30, 2024												December 31, 2023
						Carrying value						% of Total						Carrying value						% of Total
			Mortgage loans, held for investment:
			Commercial			$	546,953					104		%				$	616,368					101		%
			Allowance for expected credit losses			(22,024)						(4		%)				(6,220)						(1)		%
			Total mortgage loans, held for investment			$	524,929					100		%				$	610,148					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 September 30, 2024
			Multi-strategy funds			$	24,302					3		%				Quarterly						60-90 days
			Direct lending funds			174,441						19		%				Quarterly(1)						90 days
			Private equity funds			314,444						33		%				n/a						n/a
			Real estate funds			310,130						33		%				Quarterly(2), Annually(3)						45-90 days
			CLO-Equities			4,133						—		%				n/a						n/a
			Other privately held investments			112,284						12		%				n/a						n/a
			Total other investments			$	939,734					100		%
			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		%

n/a - not applicable

(1) Applies to one fund with a fair value of $4 million (2023: $17 million).

(2) Applies to one fund with a fair value of $54 million (2023: $66 million).

(3) Applies to one fund with a fair value of $23 million (2023: $25 million).

Summary of Net Investment Income

Net investment income was derived from the following sources:

						Three months ended September 30,												Nine months ended September 30,
						2024						2023						2024						2023
			Fixed maturities			$	163,002					$	133,006					$	456,421					$	375,659
			Other investments			19,594						312						39,569						(4,543)
			Equity securities			3,529						3,050						9,348						8,495
			Mortgage loans			8,175						8,892						26,412						26,158
			Cash and cash equivalents			14,402						14,465						41,796						35,638
			Short-term investments			3,919						2,195						11,148						5,984
			Gross investment income			212,621						161,920						584,694						447,391
			Investment expenses			(7,521)						(7,719)						(21,236)						(22,589)
			Net investment income			$	205,100					$	154,201					$	563,458					$	424,802

Summary of Net Investment Gains (Losses)

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

									Three months ended September 30,												Nine months ended September 30,
									2024						2023						2024						2023
						Gross realized investment gains
						Fixed maturities and short-term investments			$	22,649					$	4,143					$	43,232					$	27,973
						Equity securities			1,667						8,433						32,292						9,968
						Gross realized investment gains			24,316						12,576						75,524						37,941
						Gross realized investment losses
						Fixed maturities and short-term investments			(22,589)						(31,390)						(119,108)						(128,733)
						Equity securities			(7,539)						(4)						(15,251)						(400)
						Mortgage loans			(4,275)						—						(4,275)						—
						Gross realized investment losses			(34,403)						(31,394)						(138,634)						(129,133)
						(Increase) decrease in allowance for expected credit losses, fixed maturities, available for sale			209						1,618						6,338						2,800
						(Increase) decrease in allowance for expected credit losses, mortgage loans			(1,343)						(541)						(15,771)						(4,179)
						Impairment losses(1)			(14)						(41)						(178)						(9,124)
						Change in fair value of investment derivatives(2)			(870)						1,692						153						218
						Net unrealized gains (losses) on equity securities			44,287						(37,024)						42,065						3,806
						Net investment gains (losses)			$	32,182					$	(53,114)					$	(30,503)					$	(97,671)

(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 6 '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:

									Three months ended September 30,																					Nine months ended September 30,
									2024						2023																					2024						2023
						Balance at beginning of period			$	4,631					$	10,551																				$	10,759					$	11,733
						Expected credit losses on securities where credit losses were not previously recognized			325						21																					604						4,376
						Additions (reductions) for expected credit losses on securities where credit losses were previously recognized			(451)						708																					(1,858)						404
						Impairments of securities which the Company intends to sell or more likely than not will be required to sell			—						—																					—						—
						Securities sold/redeemed/matured			(83)						(2,347)																					(5,083)						(7,580)
						Balance at end of period			$	4,422					$	8,933																				$	4,422					$	8,933

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