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Fair Values of Financial Instruments Carrying Amounts and Estimated Fair value of Financial Instruments Not Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Mortgage Loans, Carrying Amount | [1],[2] | $ 2,129.8 | $ 2,224.5
Policy Loans |  | 3,584.1 | 3,617.2
Long-term Debt |  | 3,470.8 | 3,465.2
Liabilities, Fair Value Disclosure |  | 259.6 | 255.7
Fair Value, Nonrecurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Mortgage Loans, Fair Value Disclosure |  | 1,977.5 | 1,975.4
Mortgage Loans, Carrying Amount |  | 2,129.8 | 2,224.5
Policy Loans, Fair Value Disclosure |  | 3,653.4 | 3,672.9
Policy Loans |  | 3,584.1 | 3,617.2
Miscellaneous Long-Term Investments, Fair Value Disclosure |  | 38.2 | 26.9
Miscellaneous Long-Term Investments, Carrying Value |  | 38.2 | 26.9
Financial Instruments, Financial Assets Fair Value Disclosure |  | 5,669.1 | 5,675.2
Total Financial Instrument Assets Not Carried at Fair Value |  | 5,752.1 | 5,868.6
Long-term Debt, Fair Value Disclosure |  | 3,380.8 | 3,289.3
Long-term Debt |  | 3,470.8 | 3,465.2
Unfunded Commitments |  | 0.2 | 0.2
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure |  | 585.4 | 324.2
Payables for Collateral on Investments |  | 585.4 | 324.2
Liabilities, Fair Value Disclosure |  | 3,966.4 | 3,613.7
Total Financial Instrument Liabilities Not Carried at Fair Value |  | 4,056.4 | 3,789.6
Fair Value, Inputs, Level 1 | Fair Value, Nonrecurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Mortgage Loans, Fair Value Disclosure |  | 0.0 | 0.0
Policy Loans, Fair Value Disclosure |  | 0.0 | 0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure |  | 0.0 | 0.0
Financial Instruments, Financial Assets Fair Value Disclosure |  | 0.0 | 0.0
Long-term Debt, Fair Value Disclosure |  | 3,032.8 | 3,246.1
Unfunded Commitments |  | 0.0 | 0.0
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure |  | 0.0 | 0.0
Liabilities, Fair Value Disclosure |  | 3,032.8 | 3,246.1
Fair Value, Inputs, Level 2 | Fair Value, Nonrecurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Mortgage Loans, Fair Value Disclosure |  | 1,977.5 | 1,975.4
Policy Loans, Fair Value Disclosure |  | 0.0 | 0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure |  | 38.0 | 26.7
Financial Instruments, Financial Assets Fair Value Disclosure |  | 2,015.5 | 2,002.1
Long-term Debt, Fair Value Disclosure |  | 348.0 | 43.2
Unfunded Commitments |  | 0.2 | 0.2
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure |  | 585.4 | 324.2
Liabilities, Fair Value Disclosure |  | 933.6 | 367.6
Fair Value, Inputs, Level 3 | Fair Value, Nonrecurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Mortgage Loans, Fair Value Disclosure |  | 0.0 | 0.0
Policy Loans, Fair Value Disclosure |  | 3,653.4 | 3,672.9
Miscellaneous Long-Term Investments, Fair Value Disclosure |  | 0.2 | 0.2
Financial Instruments, Financial Assets Fair Value Disclosure |  | 3,653.6 | 3,673.1
Long-term Debt, Fair Value Disclosure |  | 0.0 | 0.0
Unfunded Commitments |  | 0.0 | 0.0
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure |  | 0.0 | 0.0
Liabilities, Fair Value Disclosure |  | $ 0.0 | $ 0.0
[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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- Definition Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(e)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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