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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 | Jun. 30, 2023 | Dec. 31, 2022
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Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Mortgage Loans, Carrying Amount | $ 2,372.8 | $ 2,435.4
Policy Loans | 3,493.3 | 3,601.2
Long-term Debt | 3,429.1 | 3,427.8
Liabilities, Fair Value Disclosure | 84.8 | 87.9
Fair Value, Nonrecurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Mortgage Loans, Fair Value Disclosure | 2,096.1 | 2,159.5
Mortgage Loans, Carrying Amount | 2,372.8 | 2,435.4
Policy Loans, Fair Value Disclosure | 3,568.1 | 3,677.0
Policy Loans | 3,493.3 | 3,601.2
Miscellaneous Long-Term Investments, Fair Value Disclosure | 15.5 | 18.4
Miscellaneous Long-Term Investments, Carrying Value | 15.5 | 18.4
Financial Instruments, Financial Assets Fair Value Disclosure | 5,679.7 | 5,854.9
Total Financial Instrument Assets Not Carried at Fair Value | 5,881.6 | 6,055.0
Long-term Debt, Fair Value Disclosure | 3,130.8 | 3,072.0
Long-term Debt | 3,429.1 | 3,427.8
Unfunded Commitments | 0.7 | 0.7
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure | 55.1 | 99.1
Payables for Collateral on Investments | 55.1 | 99.1
Liabilities, Fair Value Disclosure | 3,186.6 | 3,171.8
Total Financial Instrument Liabilities Not Carried at Fair Value | 3,484.9 | 3,527.6
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 | 2,267.5 | 2,288.9
Unfunded Commitments | 0.0 | 0.0
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure | 0.0 | 0.0
Liabilities, Fair Value Disclosure | 2,267.5 | 2,288.9
Fair Value, Inputs, Level 2 | Fair Value, Nonrecurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Mortgage Loans, Fair Value Disclosure | 2,096.1 | 2,159.5
Policy Loans, Fair Value Disclosure | 0.0 | 0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure | 14.8 | 17.1
Financial Instruments, Financial Assets Fair Value Disclosure | 2,110.9 | 2,176.6
Long-term Debt, Fair Value Disclosure | 863.3 | 783.1
Unfunded Commitments | 0.7 | 0.7
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure | 55.1 | 99.1
Liabilities, Fair Value Disclosure | 919.1 | 882.9
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 | 3,568.1 | 3,677.0
Miscellaneous Long-Term Investments, Fair Value Disclosure | 0.7 | 1.3
Financial Instruments, Financial Assets Fair Value Disclosure | 3,568.8 | 3,678.3
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

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- Definition The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 25 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481557/860-30-25-8 + Details
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- Definition Fair value portion of borrowing from Federal Home Loan Bank (FHLBank). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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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//1943274/2147479440/944-210-S99-1 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + 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)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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- Definition Fair value portion of notes payable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 323 -SubTopic 740 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481543/323-740-50-2 + Details
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