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Borrowings and Financing Activities - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Apr. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	May 31, 2024 USD ($)	Apr. 30, 2024 USD ($)	Jan. 31, 2024 USD ($)
Debt Instrument [Line Items]
Repayments in cash			$ 0	$ 527,079,000
Loss on extinguishment of debt	$ 0	$ 0	0	$ 4,275,000
Collateral	6,484,692,000		6,484,692,000			$ 6,345,236,000
Residential mortgage loans held for sale \| Asset Pledged as Collateral
Debt Instrument [Line Items]
Collateral	691,000,000		691,000,000			515,000,000
Total fixed-maturities available for sale \| Fixed maturities AFS and trading securities
Debt Instrument [Line Items]
FHLB, collateral pledged	105,000,000		105,000,000			49,000,000
Senior Notes
Debt Instrument [Line Items]
Outstanding borrowings	1,066,603,000		$ 1,066,603,000			1,065,337,000
FHLB Advances \| Minimum
Debt Instrument [Line Items]
FHLB, ratio of market value of collateral to advances			1.03
FHLB Advances \| Maximum
Debt Instrument [Line Items]
FHLB, ratio of market value of collateral to advances			1.14
Mortgage Loan Financing Facilities \| Goldman Sachs Master Repurchase Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 200,000,000
Mortgage Loan Financing Facilities \| BMO Master Repurchase Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 400,000,000
Mortgage Loan Financing Facilities \| JP Morgan Master Repurchase Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 400,000,000
Mortgage Loan Financing Facilities \| Everbank Master Repurchase Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 125,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Fair value of amount outstanding	0		$ 0
Borrowed debt	50,000,000
Repayment of debt	50,000,000
Revolving Credit Facility \| Unsecured Revolving Credit Facility, Expiration Date 2026
Debt Instrument [Line Items]
Current borrowing capacity	$ 275,000,000		$ 275,000,000
Senior Notes due 2029 \| Senior Notes
Debt Instrument [Line Items]
Interest rate on senior notes	6.20%		6.20%
Outstanding borrowings	$ 618,592,000		$ 618,592,000			$ 617,876,000