Commitments and Contingencies - Additional Information (Details)				3 Months Ended	12 Months Ended
	Nov. 25, 2024 complainant	Sep. 26, 2024 complainant	Apr. 30, 2024 complainant	Dec. 31, 2024 USD ($) guarantee	Dec. 31, 2024 USD ($) state guarantee	Dec. 31, 2023 USD ($)	Dec. 31, 2022	Nov. 14, 2024 claim
Obligation with Joint and Several Liability Arrangement [Line Items]
Retention limits per life					$ 500,000
Life insurance ceded as percent of total life insurance in force					0.30%	0.30%
Life and accident and health insurance ceded as a percent of premium income					0.20%	0.20%
Percentage of annuities ceded				68.00%
Life insurance assumed as a percent of life insurance in force					0.80%	0.90%
Life and accident and health insurance assumed as a percent of premium income					0.90%	1.30%	1.50%
Number of guarantee agreements | guarantee				0	0
Guaranty liabilities				$ 0	$ 0
Letters of credit facility outstanding				115,000,000	$ 115,000,000	$ 115,000,000
Number of states private entities contracted with for audits | state					47
Number of complainants | complainant	2	6	6
Number of claims | claim								1
Letter of Credit
Obligation with Joint and Several Liability Arrangement [Line Items]
Letter of credit maximum available amount				$ 250,000,000	$ 250,000,000