Investments - Summary of Fixed Maturities Available for Sale by Component (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Allowance for Credit Losses	$ (32,767)	$ 0
Fair value	17,206,885	16,503,365
Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,526,703	18,301,692
Allowance for Credit Losses	(32,767)	0
Gross Unrealized Gains	371,301	238,967
Gross Unrealized Losses	(1,658,352)	(2,037,294)
Fair value	$ 17,206,885	$ 16,503,365
Percentage of Fixed Maturities at Fair Value	100.00%	100.00%
U.S. Government direct, guaranteed, and government-sponsored enterprises \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 389,441	$ 394,439
Allowance for Credit Losses	0	0
Gross Unrealized Gains	114	27
Gross Unrealized Losses	(27,482)	(38,968)
Fair value	$ 362,073	$ 355,498
Percentage of Fixed Maturities at Fair Value	2.00%	2.00%
States, municipalities, and political subdivisions \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,894,161	$ 2,791,030
Allowance for Credit Losses	0	0
Gross Unrealized Gains	41,407	24,328
Gross Unrealized Losses	(426,929)	(505,447)
Fair value	$ 2,508,639	$ 2,309,911
Percentage of Fixed Maturities at Fair Value	15.00%	14.00%
Foreign governments \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 53,789	$ 55,164
Allowance for Credit Losses	0	0
Gross Unrealized Gains	13	6
Gross Unrealized Losses	(11,282)	(12,706)
Fair value	$ 42,520	$ 42,464
Percentage of Fixed Maturities at Fair Value	0.00%	0.00%
Corporates \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 15,064,568	$ 14,935,625
Allowance for Credit Losses	(32,767)	0
Gross Unrealized Gains	321,039	201,336
Gross Unrealized Losses	(1,185,701)	(1,470,897)
Fair value	$ 14,167,139	$ 13,666,064
Percentage of Fixed Maturities at Fair Value	82.00%	83.00%
Corporates \| Financial \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,973,445	$ 4,907,794
Allowance for Credit Losses	(26,040)	0
Gross Unrealized Gains	84,796	63,126
Gross Unrealized Losses	(453,394)	(504,489)
Fair value	$ 4,578,807	$ 4,466,431
Percentage of Fixed Maturities at Fair Value	27.00%	27.00%
Corporates \| Utilities \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,958,888	$ 1,924,190
Allowance for Credit Losses	0	0
Gross Unrealized Gains	70,798	36,670
Gross Unrealized Losses	(94,579)	(125,713)
Fair value	$ 1,935,107	$ 1,835,147
Percentage of Fixed Maturities at Fair Value	11.00%	11.00%
Corporates \| Energy \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,434,766	$ 1,436,598
Allowance for Credit Losses	0	0
Gross Unrealized Gains	38,477	22,637
Gross Unrealized Losses	(80,338)	(101,923)
Fair value	$ 1,392,905	$ 1,357,312
Percentage of Fixed Maturities at Fair Value	8.00%	8.00%
Corporates \| Other corporate sectors \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 6,697,469	$ 6,667,043
Allowance for Credit Losses	(6,727)	0
Gross Unrealized Gains	126,968	78,903
Gross Unrealized Losses	(557,390)	(738,772)
Fair value	$ 6,260,320	$ 6,007,174
Percentage of Fixed Maturities at Fair Value	36.00%	37.00%
Collateralized debt obligations \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 36,778	$ 37,098
Allowance for Credit Losses	0	0
Gross Unrealized Gains	8,724	13,266
Gross Unrealized Losses	0	0
Fair value	$ 45,502	$ 50,364
Percentage of Fixed Maturities at Fair Value	0.00%	0.00%
Other asset-backed securities \| Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 87,966	$ 88,336
Allowance for Credit Losses	0	0
Gross Unrealized Gains	4	4
Gross Unrealized Losses	(6,958)	(9,276)
Fair value	$ 81,012	$ 79,064
Percentage of Fixed Maturities at Fair Value	1.00%	1.00%

Percentage of fixed maturities by component at fair value.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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