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Investments - Summary of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Realized gross gains	$ 113	$ 1,650	$ 1,005	$ 14,397
Realized gross losses	(348)	(1,370)	(3,141)	(14,634)
Impairment loss	0	$ (105)	(176)	$ (7,411)
Fair Value
Less than 12 months	1,089,263		1,089,263		$ 2,474,361
12 months or more	3,286,946		3,286,946		1,586,877
Total	4,376,209		4,376,209		4,061,238
Gross Unrealized Losses
Less than 12 months	(38,805)		(38,805)		(198,613)
12 months or more	(467,040)		(467,040)		(248,891)
Total	(505,845)		(505,845)		(447,504)
U.S. Treasury securities
Fair Value
Less than 12 months	322,348		322,348		321,848
12 months or more	360,082		360,082		169,795
Total	682,430		682,430		491,643
Gross Unrealized Losses
Less than 12 months	(4,324)		(4,324)		(12,381)
12 months or more	(25,653)		(25,653)		(15,695)
Total	(29,977)		(29,977)		(28,076)
U.S. agency securities
Fair Value
Less than 12 months	7,180		7,180		7,117
12 months or more	0		0		0
Total	7,180		7,180		7,117
Gross Unrealized Losses
Less than 12 months	(18)		(18)		(8)
12 months or more	0		0		0
Total	(18)		(18)		(8)
U.S. agency mortgage-backed securities
Fair Value
Less than 12 months	114,881		114,881		351,310
12 months or more	636,057		636,057		415,743
Total	750,938		750,938		767,053
Gross Unrealized Losses
Less than 12 months	(6,760)		(6,760)		(34,193)
12 months or more	(140,979)		(140,979)		(80,997)
Total	(147,739)		(147,739)		(115,190)
Municipal debt securities
Fair Value
Less than 12 months	254,197		254,197		335,784
12 months or more	300,187		300,187		64,766
Total	554,384		554,384		400,550
Gross Unrealized Losses
Less than 12 months	(11,946)		(11,946)		(41,620)
12 months or more	(63,144)		(63,144)		(19,634)
Total	(75,090)		(75,090)		(61,254)
Non-U.S. government securities:
Fair Value
Less than 12 months	0		0		48,071
12 months or more	48,571		48,571		14,328
Total	48,571		48,571		62,399
Gross Unrealized Losses
Less than 12 months	0		0		(2,914)
12 months or more	(8,836)		(8,836)		(4,338)
Total	(8,836)		(8,836)		(7,252)
Corporate debt securities
Fair Value
Less than 12 months	264,701		264,701		811,217
12 months or more	991,284		991,284		421,307
Total	1,255,985		1,255,985		1,232,524
Gross Unrealized Losses
Less than 12 months	(11,767)		(11,767)		(69,415)
12 months or more	(136,817)		(136,817)		(63,972)
Total	(148,584)		(148,584)		(133,387)
Residential and commercial mortgage securities
Fair Value
Less than 12 months	36,985		36,985		265,934
12 months or more	449,512		449,512		242,366
Total	486,497		486,497		508,300
Gross Unrealized Losses
Less than 12 months	(3,098)		(3,098)		(22,628)
12 months or more	(66,785)		(66,785)		(43,853)
Total	(69,883)		(69,883)		(66,481)
Asset-backed securities
Fair Value
Less than 12 months	88,971		88,971		333,080
12 months or more	501,253		501,253		258,572
Total	590,224		590,224		591,652
Gross Unrealized Losses
Less than 12 months	(892)		(892)		(15,454)
12 months or more	(24,826)		(24,826)		(20,402)
Total	$ (25,718)		$ (25,718)		$ (35,856)

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