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v3.23.2

Investments - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 USD ($) Integer | Jun. 30, 2022 USD ($) Integer | Jun. 30, 2023 USD ($) Integer | Jun. 30, 2022 USD ($) Integer | Dec. 31, 2022 USD ($)
Schedule of Investments |  |  |  |  |
Other Long-term Investments | $ 1,503,200,000 |  | $ 1,503,200,000 |  | $ 1,440,100,000
Accrued Investment Income | 715,100,000 |  | 715,100,000 |  | 615,000,000.0
Write-offs |  |  | 0 |  | 0
Gains (Losses) on Sales on Loan Foreclosure | 0 | $ 0 | 0 | $ 0 |
Commitments to Fund Commercial Mortgage Loans | 0 |  | 0 |  |
Real Estate Investment Property, Net | 70,300,000 |  | 70,300,000 |  | 71,600,000
Real Estate Held-for-sale | 40,900,000 |  | 40,900,000 |  | 40,900,000
Real Estate, Reclassification to Held-for-Sale, Carrying Value | $ 40,100,000 |  | $ 40,100,000 |  | 40,100,000
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 | $ 118,200,000 |  | $ 118,200,000 |  | 152,400,000
Outstanding Repurchase Agreements | 0 |  | 0 |  | 0
Equity Securities |  |  |  |  |
Schedule of Investments |  |  |  |  |
Unrealized Gain (Loss) on Investments | (200,000) | (1,400,000) | 500,000 | 1,000,000 |
Private Equity Partnerships |  |  |  |  |
Schedule of Investments |  |  |  |  |
Unrealized Gain (Loss) on Investments | 25,100,000 | 26,900,000 | 42,900,000 | 43,200,000 |
Management Fee Expense | (5,300,000) | $ (2,700,000) | (8,800,000) | $ (6,500,000) |
Off Balance Sheet Amount |  |  |  |  |
Schedule of Investments |  |  |  |  |
Securities Received as Collateral | 26,300,000 |  | 26,300,000 |  | 69,800,000
Cash Collateral for Borrowed Securities | 97,500,000 |  | 97,500,000 |  | 88,500,000
Commercial Real Estate |  |  |  |  |
Schedule of Investments |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Mortgage Loans | 2,383,900,000 |  | 2,383,900,000 |  | 2,444,700,000
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 11,100,000 |  | 11,100,000 |  | 9,300,000
Accrued Investment Income | $ 7,400,000 |  | $ 7,400,000 |  | 7,700,000
Financing Receivable, Modifications, Number of Contracts | Integer | 0 | 0 | 0 | 0 |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | $ 0 |  | $ 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | $ 0 | 0 | $ 0 |
Unfunded Mortgage Loan Commitments |  |  |  |  |
Schedule of Investments |  |  |  |  |
Allowance for Credit Losses, Unfunded Mortgage Loan Commitments | 0 |  | 0 |  | 0
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Schedule of Investments |  |  |  |  |
Other Long-term Investments | 1,268,800,000 |  | 1,268,800,000 |  | 1,195,300,000
Tax Credit Partnership | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Schedule of Investments |  |  |  |  |
Other Long-term Investments | 700,000 |  | 700,000 |  | 1,000,000
Equity Method Investments | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Schedule of Investments |  |  |  |  |
Other Long-term Investments | 1,268,100,000 |  | 1,268,100,000 |  | $ 1,194,300,000
Private Placement Fixed Maturity |  |  |  |  |
Schedule of Investments |  |  |  |  |
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability | $ 97,800,000 |  | $ 97,800,000 |  |
External Credit Rating, Investment Grade |  |  |  |  |
Schedule of Investments |  |  |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position | 878 |  | 878 |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year | 714 |  | 714 |  |
External Credit Rating, Below-Investment-Grade |  |  |  |  |
Schedule of Investments |  |  |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position | 106 |  | 106 |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year | 85 |  | 85 |  |

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