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v3.25.4

Investments - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 01, 2025 USD ($)
Schedule of Investments |  |  |  |  |
Other Long-term Investments |  | $ 1,670,400,000 | $ 1,694,400,000 |  |
Financing Receivable, Allowance for Credit Losses |  | 15,900,000 | 16,100,000 |  |
Accrued Investment Income |  | $ 596,000,000.0 | 649,800,000 |  |
Financing Receivable, Modified, Weighted Average Term Increase from Modification |  | 24 months |  |  |
Foreclosed Real Estate Expense |  | $ 0 | 0 | $ 0 |
Committments to Fund Commercial Mortgage Loans |  | 0 | 17,900,000 |  |
Real Estate Investment Property, Net |  | 41,700,000 | 59,500,000 |  |
Real Estate Held-for-sale |  | $ 41,900,000 | 41,900,000 |  |
Repurchase agreements - Typical Days outstanding |  | 30 |  |  |
Minimum percent of the fair value of securities loaned or securities purchased under repurchase agreements be maintained as collateral |  | 102.00% |  |  |
Gross Securities Loaned |  | $ 106,100,000 | 94,000,000.0 |  |
Outstanding Repurchase Agreements |  | 0 | 0 |  |
Financing Receivable, Nonaccrual |  |  | 1,000,000 | 1,000,000 |
Financing Receivable, Nonaccrual, Interest Income |  | 0 | 0 | 0 |
Mortgage Loans | [1] | 2,109,500,000 | 2,224,500,000 |  |
Other Investments Gross Realized Losses |  | 2,100,000 | 0 | 1,000,000.0 |
Net Investment Loss |  | (106,600,000) | (34,600,000) | (36,000,000.0) |
Long-term Care and Individual Disability Reinsurance Transaction |  |  |  |  |
Schedule of Investments |  |  |  |  |
Accrued Investment Income |  |  |  |  | $ 47,100,000
Operating Segments |  |  |  |  |
Schedule of Investments |  |  |  |  |
Net Investment Loss |  | (106,600,000) | (34,600,000) | (36,000,000.0) |
Operating Segments | Long-term Care and Individual Disability Reinsurance Transaction |  |  |  |  |
Schedule of Investments |  |  |  |  |
Net Investment Loss |  | (46,800,000) | 0 | 0 |
Financial Asset, Past Due |  |  |  |  |
Schedule of Investments |  |  |  |  |
Mortgage Loans |  | 8,400,000 | 9,200,000 |  |
Private Equity Partnerships |  |  |  |  |
Schedule of Investments |  |  |  |  |
Unrealized Gain (Loss) on Investments |  | 128,100,000 | 127,100,000 | 102,900,000 |
Management Fee Expense |  | 36,900,000 | 24,000,000 | 24,800,000 |
Off Balance Sheet Amount |  |  |  |  |
Schedule of Investments |  |  |  |  |
Cash Collateral for Borrowed Securities |  | 76,100,000 | 62,700,000 |  |
Securities Received as Collateral |  | 34,100,000 | 34,800,000 |  |
Commercial Real Estate |  |  |  |  |
Schedule of Investments |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 2,125,400,000 | 2,240,600,000 |  |
Financing Receivable, Allowance for Credit Losses |  | 15,900,000 | 16,100,000 | $ 10,200,000 |
Accrued Investment Income |  | 6,700,000 | 7,000,000.0 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  | 800,000 | 7,000,000.0 |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | 14,200,000 |  |  |
Other Investments Gross Realized Losses |  | 1,100,000 |  |  |
Unfunded Mortgage Loan Commitments |  |  |  |  |
Schedule of Investments |  |  |  |  |
Allowance for Credit Losses, Unfunded Mortgage Loan Commitments |  | 0 | 100,000 |  |
Private Equity Partnerships | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Schedule of Investments |  |  |  |  |
Other Long-term Investments |  | 1,456,300,000 | $ 1,450,600,000 |  |
Private Placement Fixed Maturity |  |  |  |  |
Schedule of Investments |  |  |  |  |
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability |  | $ 87,500,000 |  |  |
External Credit Rating, Investment Grade |  |  |  |  |
Schedule of Investments |  |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions |  | 822 |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year |  | 767 |  |  |
External Credit Rating, Below-Investment-Grade |  |  |  |  |
Schedule of Investments |  |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions |  | 40 |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year |  | 30 |  |  |
[1] | Loan-to-Value Ratio utilizes the most recent internal valuation of the property

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