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Investments - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 USD ($) Integer | Jun. 30, 2023 USD ($) Integer | Jun. 30, 2024 USD ($) Integer | Jun. 30, 2023 USD ($) Integer | Dec. 31, 2023 USD ($)
Schedule of Investments |  |  |  |  |
Other Long-term Investments | $ 1,646,300,000 |  | $ 1,646,300,000 |  | $ 1,579,400,000
Accrued Investment Income | 713,900,000 |  | 713,900,000 |  | 633,900,000
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 | 62,000,000.0 |  | 62,000,000.0 |  | 64,400,000
Real Estate Held-for-sale | $ 40,900,000 |  | $ 40,900,000 |  | 40,900,000
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 | $ 57,500,000 |  | $ 57,500,000 |  | 72,000,000.0
Outstanding Repurchase Agreements | 0 |  | 0 |  | 0
Off Balance Sheet Amount |  |  |  |  |
Schedule of Investments |  |  |  |  |
Securities Received as Collateral | 38,600,000 |  | 38,600,000 |  | 12,500,000
Cash Collateral for Borrowed Securities | 22,700,000 |  | 22,700,000 |  | 63,100,000
Commercial Real Estate |  |  |  |  |
Schedule of Investments |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Mortgage Loans | 2,273,200,000 |  | 2,273,200,000 |  | 2,328,400,000
Financing Receivable, Allowance for Credit Losses, Mortgage Loans | 12,100,000 |  | 12,100,000 |  | 10,200,000
Accrued Investment Income | 7,100,000 |  | 7,100,000 |  | 7,200,000
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 |
Financing Receivable, Modifications, Number of Contracts | Integer | 0 | 0 | 0 | 0 |
Unfunded Mortgage Loan Commitments |  |  |  |  |
Schedule of Investments |  |  |  |  |
Allowance for Credit Losses, Unfunded Mortgage Loan Commitments | $ 0 |  | $ 0 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Schedule of Investments |  |  |  |  |
Other Long-term Investments | 1,407,200,000 |  | 1,407,200,000 |  | 1,326,500,000
Private Placement Fixed Maturity |  |  |  |  |
Schedule of Investments |  |  |  |  |
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability | 86,000,000.0 |  | 86,000,000.0 |  |
Tax Credit Partnership | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Schedule of Investments |  |  |  |  |
Other Long-term Investments | 300,000 |  | 300,000 |  | 300,000
Equity Method Investments | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Schedule of Investments |  |  |  |  |
Other Long-term Investments | $ 1,406,900,000 |  | $ 1,406,900,000 |  | $ 1,326,200,000
External Credit Rating, Investment Grade |  |  |  |  |
Schedule of Investments |  |  |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position | 929 |  | 929 |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year | 834 |  | 834 |  |
External Credit Rating, Below-Investment-Grade |  |  |  |  |
Schedule of Investments |  |  |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position | 74 |  | 74 |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year | 67 |  | 67 |  |

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- Definition Collateral Requirements, Minimum Percentage, Collateral To Fair Value Of Securities Loaned Or Purchased Under Repurchase Agreements + References No definition available. + Details
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- Definition Amount of allowance for credit loss of accounts and financing receivables. Includes, but is not limited to, notes and loan receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-4 + Details
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