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v3.25.3

Investments - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Jul. 01, 2025 USD ($)
Schedule of Investments |  |  |  |  |  |  |
Other Long-term Investments |  | $ 1,682,200,000 |  | $ 1,682,200,000 |  | $ 1,694,400,000 |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans |  | 15,600,000 |  | 15,600,000 |  | 16,100,000 |
Accrued Investment Income |  | 735,700,000 |  | $ 735,700,000 |  | 649,800,000 |
Financing Receivable, Modified in Period, Amount |  | 0 | $ 0 |  | $ 0 |  |
Financing Receivable, Modified, Weighted Average Term Increase from Modification |  |  |  | 24 months |  |  |
Gains (Losses) on Sales on Loan Foreclosure |  |  |  | $ 0 |  | 0 |
Commitments to Fund Commercial Mortgage Loans |  | 9,100,000 |  | 9,100,000 |  |  |
Real Estate Investment Property, Net |  | 42,800,000 |  | 42,800,000 |  | 59,500,000 |
Real Estate Held-for-sale |  | $ 51,400,000 |  | $ 51,400,000 |  | 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% |  | 102.00% |  |  |
Gross Securities Loaned |  | $ 129,800,000 |  | $ 129,800,000 |  | 94,000,000.0 |
Outstanding Repurchase Agreements |  | 0 |  | $ 0 |  | 0 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  |  | 0.70% |  |  |
Net Investment Loss |  | 128,000,000.0 | (12,900,000) | $ (96,500,000) | (24,500,000) |  |
Mortgage Loans (net of allowance for credit losses of $15.6; $16.1) | [1],[2] | 2,129,800,000 |  | 2,129,800,000 |  | 2,224,500,000 |
Financial Asset, Past Due |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Mortgage Loans (net of allowance for credit losses of $15.6; $16.1) |  | 8,400,000 |  | 8,400,000 |  | 9,200,000 |
Operating Segments |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Net Investment Loss |  | 128,000,000.0 | (12,900,000) | (96,500,000) | (24,500,000) |  |
Long-term Care and Individual Disability Reinsurance Transaction |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Accrued Investment Income |  |  |  |  |  |  | $ 47,100,000
Long-term Care and Individual Disability Reinsurance Transaction | Operating Segments |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Net Investment Loss |  | 137,600,000 | $ 0 | (46,800,000) | $ 0 |  |
Subsidiary Dividend Funding |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Net Investment Loss |  |  |  | 19,100,000 |  |  |
Off Balance Sheet Amount |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Securities Received as Collateral |  | 26,000,000.0 |  | 26,000,000.0 |  | 34,800,000 |
Cash Collateral for Borrowed Securities |  | 109,000,000.0 |  | 109,000,000.0 |  | 62,700,000 |
Commercial Real Estate |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Mortgage Loans | [1] | 2,145,400,000 |  | 2,145,400,000 |  | 2,240,600,000 |
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | [1] | 15,600,000 |  | 15,600,000 |  | 16,100,000 |
Accrued Investment Income |  | 6,800,000 |  | 6,800,000 |  | 7,000,000.0 |
Write-offs |  | 800,000 |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | 14,200,000 |  |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing |  | 1,000,000 |  | 1,000,000 |  | 1,000,000 |
Unfunded Mortgage Loan Commitments |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Allowance for Credit Losses, Unfunded Mortgage Loan Commitments |  |  |  |  |  | 100,000 |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Other Long-term Investments |  | 1,456,500,000 |  | 1,456,500,000 |  | 1,450,800,000 |
Private Placement Fixed Maturity |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability |  | 61,400,000 |  | 61,400,000 |  |  |
Tax Credit Partnership | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Other Long-term Investments |  | 200,000 |  | 200,000 |  | 200,000 |
Equity Method Investments | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Other Long-term Investments |  | $ 1,456,300,000 |  | $ 1,456,300,000 |  | $ 1,450,600,000 |
External Credit Rating, Investment Grade |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position |  | 825 |  | 825 |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year |  | 765 |  | 765 |  |  |
External Credit Rating, Below-Investment-Grade |  |  |  |  |  |  |
Schedule of Investments |  |  |  |  |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position |  | 47 |  | 47 |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year |  | 33 |  | 33 |  |  |
[1] | 1 Loan-to-Value Ratio utilizes the most recent internal valuation of the property
[2] | Loan-to-Value Ratio utilizes the most recent internal valuation of the property

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