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Investments - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) commercial_mortgage_loan loan issuer Issue	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) commercial_mortgage_loan loan issuer Issue	Sep. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($) issuer commercial_mortgage_loan Issue	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 18,334,570		$ 18,334,570			$ 17,870,206
Percentage of fixed maturities at fair value	100.00%		100.00%			100.00%
Fixed maturity, portfolio issues \| Issue	2,532		2,532			2,473
Fixed portfolio, number of issuers \| issuer	975		975			980
Number of loans \| loan	36		36
Increase in allowance for credit losses			$ 3,500
Allowance for credit losses	$ 7,202	$ 2,988	7,202	$ 2,988	$ 5,826	$ 3,672	$ 2,928	$ 1,789
Realized gains (losses)	$ (2,192)	$ (2,193)	$ (26,580)	$ (78,963)
Number of loans in non-accrual status \| commercial_mortgage_loan	0		0			0
Mortgage loans	$ 381,315		$ 381,315			$ 279,199
Other long-term investments under fair value option	1,221,888		1,221,888			835,878
Investment funds, unfunded commitments	612,000		612,000
Unfunded Loan Commitment
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	$ 31,000		$ 31,000
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Financing receivable, number of delinquent loans \| commercial_mortgage_loan	1		1
Delinquent loans, outstanding par value (in dollars per share)	$ 36,000		$ 36,000
Delinquent loans, outstanding interest	$ 1,900		$ 1,900
Number of loans in non-accrual status \| commercial_mortgage_loan	3,000		3,000
Outstanding principal on nonaccrual loan	$ 8,800		$ 8,800
Corporates
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 14,923,044		$ 14,923,044			$ 14,405,183
Percentage of fixed maturities at fair value	81.00%		81.00%			81.00%
Company owned life insurance
Debt Securities, Available-for-sale [Line Items]
Other long-term investments under fair value option	$ 200,114		$ 200,114			$ 0
Investment in Limited Partnerships
Debt Securities, Available-for-sale [Line Items]
Capital called from investment funds			226,000
Investment funds, unfunded commitments	612,481		612,481
Real Estate Investment Trust \| Fixed maturities available for sale \| Corporates
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 429,000		$ 429,000			$ 425,000
Percentage of fixed maturities at fair value	2.00%		2.00%			2.00%