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loan bank stock Federal Home Loan Bank Stock Effect of changes in discount rate assumptions, beginning of period Effect of changes in discount rate assumptions, end of period AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax Schedule of Changes in the Allowance for Current Expected Credit Losses Related to Investments Held by VIEs Variable Interest Entities, Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block] Variable Interest Entities, Debt Securities, Available-for-Sale, Allowance for Credit Loss Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Title and Position [Domain] Title and Position [Domain] Market risk benefit liability Balance reported as a liability Market Risk Benefit, Liability, Amount Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Investment Rating [Axis] Investment Rating [Axis] Investment Rating [Axis] Weighted average attained age of contract holders Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age Borrowings Due July 2028 at 4.207% Borrowings Due July 2028 Rate One [Member] Borrowings Due July 2028 Rate One Significant other observable inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Net premiums collected Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected Insurance liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Policyholder Liabilities Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] Liabilities for insurance products: Insurance Loss Reserves [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Non-cash collateral Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Key Employee Key Employee [Member] Key Employee Benefit payments Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment Class of Treasury Stock [Table] Class of Treasury Stock [Table] Revenues related to earnings attributable to VIEs Revenues related to certain non-strategic investments and earnings attributable to non-controlling interests Revenues related to certain non-strategic investments and earnings attributable to non-controlling interests INVESTMENT BORROWINGS Investment Borrowings [Text Block] Investment Borrowings [Text Block] Deferred Charges, Insurers [Abstract] Deferred Charges, Insurers [Abstract] Schedule of Operating Information by Segment Segment Reporting [Table Text Block] Investment losses: Gain (Loss) on Investments [Abstract] Funding agreements Funding Agreement Backed Notes Funding Agreement Backed Notes [Member] Funding Agreement Backed Notes Other comprehensive income (loss), net of tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fixed indexed annuities Embedded derivatives related to fixed indexed annuities Fixed Indexed Annuities [Member] Fixed Indexed Annuities Option budget Measurement Input, Option Budget [Member] Measurement Input, Option Budget Due after one year through five years Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five LITIGATION AND OTHER LEGAL PROCEEDINGS Contingencies Disclosure [Text Block] Document Period End Date Document Period End Date Notes receivable of VIEs held by subsidiaries Variable Interest Entity Notes Receivable Held By Insurance Subsidiaries Notes receivable of VIE's held by insurance subsidiaries Percent of recovery expected Measurement Input, Expected Recovery Percentage [Member] Measurement Input, Expected Recovery Percentage Basic: Earnings Per Share, Basic [Abstract] Gross realized losses on sales of fixed maturities, available for sale Debt Securities, Available-for-Sale, Realized Loss Net losses from the sales of fixed maturities Variable Interest Entities Net Gain (Loss) From Sale Of Fixed Maturity Investments Variable Interest Entities Net Gain (Loss) From Sale Of Fixed Maturity Investments Employee benefit plans, net of shares used to pay tax withholdings Stock Based Compensation Stock Based Compensation Non Investment Grade Non Investment Grade [Member] Non Investment Grade [Member] Eliminations Consolidation, Eliminations [Member] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 CONSOLIDATED STATEMENT OF CASH FLOWS Cash Flow, Supplemental Disclosures [Text Block] Net liability, beginning of period Net liability (asset), end of period Net liability Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk Income tax benefit (expense) related to items of accumulated other comprehensive income Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Borrowings Due December 2027 at 4.187% Borrowings Due December 2027 Rate Three [Member] Borrowings Due December 2027 Rate Three Consolidation Items [Domain] Consolidation Items [Domain] Interest credited Interest Credited Interest Credited Total insurance product line revenue Insurance Product Line Revenue Insurance Product Line Revenue EARNINGS PER SHARE Earnings Per Share [Text Block] Earnings per common share: Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Total liabilities Liabilities Policy loans Policy Loans Receivable Trading Symbol Trading Symbol Discount margins Measurement Input, Discount Rate [Member] Fixed maturities, available for sale, at fair value (net of allowance for credit losses: June 30, 2026 - $41.5 and December 31, 2025 - $36.0; amortized cost: June 30, 2026 - $26,580.2 and December 31, 2025 - $25,776.4) Estimated fair value Estimated fair value Total fixed maturities, available for sale Debt Securities, Available-for-Sale, Excluding Accrued Interest Balance reported as an asset Market Risk Benefit, Asset, Amount Borrowings Due January 2028 at 4.178% Borrowings Due January 2028 Rate Four [Member] Borrowings Due January 2028 Rate Four Federal Home Loan Bank Proceeds from FHLBank Borrowings, Financing Activities Company Selected Measure Name Company Selected Measure Name Gains (losses) included in accumulated other comprehensive loss Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Schedule of Variable Interest Entities by Contractual Maturity Variable Interest Entities, Fair Value by Contractual Maturity [Table Text Block] Variable Interest Entities, Fair Value by Contractual Maturity [Table Text Block] Karen J. DeToro [Member] Karen J. DeToro Other investment gains (losses) Other investment gains (losses) Other Investments Gain (Loss) Other Investments Gain (Loss) Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] 3.00%-4.99% Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0499 [Member] Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0499 Withdrawals from deposit products Repayments of Annuities and Investment Certificates Diluted: Earnings Per Share, Diluted [Abstract] Cash and cash equivalents held by variable interest entities Held by variable interest entities Cash And Cash Equivalents Held By Variable Interest Entities Total of cash and cash equivalents of consolidated variable interest entities where we are the primary beneficiary. Value of available for sale securities sold Available For Sale Securities, Value Of Securities Sold Available For Sale Securities, Value Of Securities Sold Investment borrowings Investment Borrowings Amounts borrowed by a wholly owned subsidiary primarily from the Federal Home Loan Bank of Indianapolis; the proceeds of which were used to purchase fixed maturity securities. Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag Non-Life [Member] Non-Life [Member] Non-Life Interest accrual Market Risk Benefit, Interest Expense Credit Facility [Domain] Credit Facility [Domain] Liability for life insurance policy claims Liability for Claims and Claims Adjustment Expense Borrowings Due May 2031 Rate at 4.200% Borrowings Due May 2031 Rate Two [Member] Borrowings Due May 2031 Rate Two Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Liability for future policy benefits remeasurement gain Liability for Future Policy Benefit, Remeasurement Gain (Loss) Debt covenant, required minimum debt to total capitalization ratio Debt Instrument, Covenant, Maximum Required Debt To Total Capitalization Ratio Debt Instrument, Covenant, Maximum Required Debt To Total Capitalization Ratio Federal home loan bank advances, collateral pledged Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Dividends (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Life [Member] Life [Member] Life Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Other Deferred Tax Assets, Other Additions (reductions) for securities where an allowance was previously recorded Additions (reductions) for securities where an allowance was previously recorded Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) Net operating loss carryforwards Operating Loss Carryforwards Unfunded commitments to limited partnerships Unfunded Commitments to Limited Partnerships Unfunded Commitments to Limited Partnerships Total insurance product margin Gross Profit Unobservable inputs, liabilities Embedded Derivative Liability, Measurement Input Structured securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Deferred tax assets: Components of Deferred Tax Assets [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] No Expiration Date [Member] No Expiration Date [Member] No Expiration Date Carrying value of fixed maturities that were non-income producing Investments, Fixed Maturity, Carrying Value, Non-Income Producing Investments, Fixed Maturity, Carrying Value, Non-Income 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Policyholder Benefits and Claims Incurred, Ceded Flooring impact Liability for Future Policy Benefit, Flooring Impact Liability for Future Policy Benefit, Flooring Impact Total capitalization percentage Debt Instrument, Capitalization Percentage Debt Instrument, Capitalization Percentage Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Reinsurance receivables Derivative Asset, Not Subject to Master Netting Arrangements Derivative Asset, Not Subject to Master Netting Arrangements Schedule of Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Table Text Block] Payments on financing arrangements Payments On Financing Arrangements Payments On Financing Arrangements Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Movement in Deferred Sales Inducements [Roll Forward] Movement in Deferred Sales Inducements [Roll Forward] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Balance, beginning of period, before effect of changes in the instrument-specific credit risk Net liability, end of period, before effect of changes in the instrument-specific credit risk Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change INVESTMENTS Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Amortization expense Present Value of Future Insurance Profits, Amortization Expense Expiration Date Trading Arrangement Expiration Date Fair value Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] Adjusted beginning of period PVEFPB Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change Subordinated Debt Subordinated Debt [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Borrowings Due May 2030 at 4.289% Borrowings Due May 2030 Rate Three [Member] Borrowings Due May 2030 Rate Three Issuance of common stock Proceeds from Issuance of Common Stock Mortgage loans Mortgage Loans on Real Estate, Fair Value Mortgage Loans on Real Estate, Fair Value 80% to less than 90% Debt-To-Value Ratio, 80 To Less Than 90 Percent [Member] Debt-To-Value Ratio, 80 To Less Than 90 Percent [Member] Amounts netted in expenses not allocated to product lines Fee and Other Income, Netted in Expenses Fee and Other Income, Netted in Expenses Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] 90% to less than 100% Debt-To-Value Ratio, 90 Percent Or Greater [Member] Debt-To-Value Ratio, 90 Percent Or Greater [Member] Segments [Domain] Segments [Domain] Borrowings Due May 2030 at 4.280% Borrowings Due May 2030 Rate Two [Member] Borrowings Due May 2030 Rate Two NOTES PAYABLE – DIRECT CORPORATE OBLIGATIONS Debt Disclosure [Text Block] Borrowings Due February 2031 at 4.246% Borrowings Due February 2031 Rate One [Member] Borrowings Due February 2031 Rate One Mortgage loans (net of allowance for credit losses: June 30, 2026 - $17.0 and December 31, 2025 - $20.9) Financing Receivable, after Allowance for Credit Loss Long-term care Long-Term Care [Member] Long-Term Care Change in estimated fair value of trading securities Increase (Decrease) in Debt Securities, Trading PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Estimated fair value Estimated fair value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Decrease in fair value of certain fixed maturity investments with embedded derivatives Changes in fair value of embedded derivative liabilities and market risk benefits Embedded derivatives related to fixed indexed annuities Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Expected future benefits and expenses (Discounted) Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Domain] Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Domain] Interest rate Debt Instrument, Interest Rate, Stated Percentage Dividends on common stock Common stock dividends declared Dividends, Common Stock, Cash Total shareholders' equity Balance, beginning of period Balance, end of period Equity, Attributable to Parent Subtotal Available For Sale Securities, Debt Maturities, Fair Value, Excluding Structured Securities Available For Sale Securities, Debt Maturities, Fair Value, Excluding Structured Securities ASSETS Assets: Assets [Abstract] EBITDA multiples Measurement Input, EBITDA Multiple [Member] Recovery method Valuation Technique, Recovery Method [Member] Valuation Technique, Recovery Method [Member] Other invested assets Other Investments Schedule of Carrying Value and Estimated Fair Value of Outstanding Commercial Mortgage Loans and Underlying Collateral Financing Receivable Credit Quality Indicators [Table Text Block] Goodwill and other asset impairment Intangible Asset, Including Goodwill, Impairment Loss Schedule of Unrealized Loss on Investments Debt Securities, Available-for-Sale Securities, Unrealized Losses and Fair Value [Table Text Block] Debt Securities, Available-for-Sale Securities, Unrealized Losses and Fair Value Insider Trading Policies and Procedures [Line Items] Surrenders and withdrawals Policyholder Account Balance, Surrender and Withdrawal Supplemental health Supplemental Health [Member] Supplemental Health Deferred tax expense Deferred Income Tax Expense (Benefit) Liabilities: Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Issuances Liability for Future Policy Benefit, Expected Net Premium, Issuance Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Entity Central Index Key Entity Central Index Key Weighted average crediting rate Policyholder Account Balance, Weighted Average Crediting Rate Additional paid-in capital Additional Paid in Capital, Common Stock Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Borrowings Due July 2027 at 4.177% Borrowings Due July 2027 Rate One [Member] Borrowings Due July 2027 Rate One Change in fair value of equity securities Increase (Decrease) in Equity Securities, FV-NI Deferrable policy acquisition costs and sales inducements Policy Acquisition Costs Payments made during the reporting period related to costs associated with acquiring new insurance customers. 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Variable Rate [Domain] Variable Rate [Domain] Interest-sensitive life Interest Sensitive Life [Member] Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Mortality Measurement Input, Mortality Rate [Member] Non-agency residential mortgage-backed securities Mortgage-Backed Securities, Issued by Private Enterprises [Member] Borrowings Due February 2028 at 4.160% Borrowings Due February 2028 Rate One [Member] Borrowings Due February 2028 Rate One Common stock dividends paid Payments of Dividends Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Schedule of Realized Gain (Loss) on Investments Realized Gain (Loss) on Investments [Table Text Block] Issuances Market Risk Benefit, Issuance, Net Market Risk Benefit, Issuance, Net Statement [Line Items] Statement [Line Items] Total assets Total assets Assets Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] VIEs Reportable Legal Entities [Member] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Other comprehensive income (loss), before tax: Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Amortization Amortization Excluding Amortization Related To Realized Gains Losses And Amortization Related To Fair Value Changes In Embedded Derivative Liabilities Amortization Excluding Amortization Related To Realized Gains Losses And Amortization Related To Fair Value Changes In Embedded Derivative Liabilities Liability for Future Policy Benefit Activity [Table] Liability for Future Policy Benefit Activity [Table] Operating Segments Operating Segments [Member] For net realized investment losses included in net income Other 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Income tax expense on operating income Income Tax (Benefit) On Operating Income (Loss) Income Tax (Benefit) On Operating Income (Loss) 5.00% and greater Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and Greater [Member] Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and Greater Retained earnings Retained Earnings [Member] Revolving Credit Facility Revolving Credit Facility [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Fair Value by Balance Sheet Location Fair Value, by Balance Sheet Grouping [Table Text Block] Corporate securities Corporate Debt Securities [Member] Net income (in dollars per share) Earnings Per Share, Diluted Total other invested assets Other Invested Assets Other Invested Assets Increase (decrease) in provision for expected credit losses Financing Receivable, Credit Loss, Expense (Reversal) Borrowings Due April 2031 Rate at 4.228% Borrowings Due April 2031 Rate Two [Member] Borrowings Due April 2031 Rate Two Total fixed maturities, available for sale Debt Securities, Available-for-Sale, Excluding Accrued Interest, Fair Value Option Debt Securities, Available-for-Sale, Excluding Accrued Interest, Fair Value Option Commissions and other operating expenses Commission and Other Operating Expenses Commission and Other Operating Expenses Fee revenue and other income Fee Revenue And Other Income Fee Revenue And Other Income Fixed Index Annuity Products Interest Sensitive Products Fixed Index Annuity Products [Member] Interest Sensitive Products Fixed Index Annuity Products [Member] Schedule of Derivatives with Master Netting Arrangements Offsetting Assets [Table Text Block] Change in allowance for credit losses and write-downs Debt Securities, Available-For-Sale, And Other 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Other changes in fair value Increase (Decrease) in Fair Value of Other Securities Increase (Decrease) in Fair Value of Other Securities Foreign governments Debt Security, Government, Non-US [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Equity Securities Equity Securities [Member] Schedule of Changes in the Allowance for Current Expected Credit Losses Related to Mortgage Loans Financing Receivable, Allowance for Credit Loss [Table Text Block] Common stock, shares issued (in shares) Balance, beginning of period (in shares) Balance, end of period (in shares) Common Stock, Shares, Issued Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value At guaranteed minimum Policyholder Account Balance, at Guaranteed Minimum Crediting Rate [Member] Future policy benefits Future policy benefits Policyholder Account Balance, Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense Policyholder Account Balance, Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense Credit Agreement Credit Agreement [Member] Credit Agreement 12 months or greater Gross unrealized losses of investments in unrealized loss position for more than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Employee benefit plans, net of shares used to pay tax withholdings (in shares) Stock Based Compensation Shares Stock Based Compensation Shares Variable interest entities, change in allowance for credit losses Variable Interest Entities, Change In Allowance For Current Expected Credit Losses Variable Interest Entities, Change In Allowance For Current Expected Credit Losses Product and Service [Domain] Product and Service [Domain] Amortized cost of fixed maturities that were non-income producing Investments, Fixed Maturity, Amortized Cost, Non-Income Producing Investments, Fixed Maturity, Amortized Cost, Non-Income Producing Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Gains on derivatives not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Borrowings Due January 2028 at 4.165% Borrowings Due January 2028 Rate Three [Member] Borrowings Due January 2028 Rate Three Reinsurance receivables Reinsurance Receivables - Embedded Derivative [Member] Reinsurance Receivables - Embedded Derivative [Member] Termination Date Trading Arrangement Termination Date Variable interest entities, investments sold Variable Interest Entities, Investments Sold Variable Interest Entities, Investments Sold Insurance policy income Proceeds from Insurance Premiums Collected Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] U.S. statutory corporate rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Borrowings Due December 2027 at 4.135% Borrowings Due December 2027 Rate Two [Member] Borrowings Due December 2027 Rate Two Net amount Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Fair Value as of Grant Date Award Grant Date Fair Value GLWB utilization Measurement Input, Utilization Rate [Member] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Stock repurchase program, remaining repurchase authorized amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Deferred Policy Acquisition Cost [Line Items] Deferred Policy Acquisition Cost [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Less than 12 months Gross unrealized losses of investments in unrealized loss position for less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Reinsurance receivables, allowance for current expected credit losses Reinsurance Recoverable, Allowance for Credit Loss Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total segment expenses Total segment expenses Segment Expenses Segment Expenses Total revenues Revenues Net federal operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Domestic Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Additions for securities for which credit losses were not previously recorded Additions for securities for which credit losses were not previously recorded Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Commercial Mortgage Commercial Mortgage [Member] Commercial Mortgage Schedule of Financial Instruments Carried at Fair Value Categorized by Input Level Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Other annuities Other Annuities [Member] Other Annuities FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Significant unobservable inputs  (Level 3) Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Borrowings Due August 2029 Rate at 4.297% Borrowings Due August 2029 Rate [Member] Borrowings Due August 2029 Rate Schedule of Balances and Changes in the Liability for Future Policy Benefits Liability for Future Policy Benefit, Activity [Table Text Block] Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] Interest accrual Liability for Future Policy Benefit, Expected Net Premium, Interest Income Borrowings Due September 2028 at 4.242% Borrowings Due September 2028 Rate One [Member] Borrowings Due September 2028 Rate One Other assets Other Assets Equity securities measured at net asset value Equity Securities Measured at Net Asset Value Equity Securities Measured at Net Asset Value Liability Class [Axis] Liability Class [Axis] Cash and cash equivalents - unrestricted and including held by variable interest entities, beginning of period Cash and cash equivalents - unrestricted and including held by variable interest entities, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3, Net Expenses attributable to VIEs Expenses related to certain non-strategic investments and earnings attributable to non-controlling interests Expenses related to certain non-strategic investments and earnings attributable to non-controlling interests Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag Fee revenue and other income Proceeds from Fees Received Debt covenant, actual consolidated net worth at period end Debt Instrument, Covenant, Actual Consolidated Net Worth, Amount Debt Instrument, Covenant, Actual Consolidated Net Worth, Amount Non-NEOs Non-NEOs [Member] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Balance, end of period, reinsurance ceded Policyholder Account Balance, Reinsurance Policyholder Account Balance, Reinsurance Interest credited Policyholder Account Balance, Interest Expense Beginning of period End of period Deferred Policy Acquisition cost, Net of Sales Inducements Deferred Policy Acquisition cost, Net of Sales Inducements Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Due after five years through ten years Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Payments to repurchase common stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] Award Type Award Type [Axis] Effect of actual variances from expected experience Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] Adjustment to instrument-specific credit risk for market risk benefits Other Comprehensive Income (Loss), Adjustment To Specific Credit Risk for Market Risk Benefit Other Comprehensive Income (Loss), Adjustment To Specific Credit Risk for Market Risk Benefit Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Purchases of investments Purchases Of Investments Purchases of investments during the period primarily related to actively managed fixed maturities. Fixed maturities, available for sale, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Retained earnings Retained Earnings (Accumulated Deficit) Borrowings Due November 2026 at 4.094% Borrowings Due November 2026 Rate [Member] Borrowings Due November 2026 Rate Product and Service [Axis] Product and Service [Axis] Total assets carried at fair value Assets Carried at Fair Value, Including Residual Tranches Assets Carried at Fair Value, Including Residual Tranches Unrealized losses on investments with an allowance for credit losses Accumulated Other Comprehensive Income (Loss), Net Unrealized Appreciation On Investments With Allowance For Credit Losses Accumulated Other Comprehensive Income (Loss), Net Unrealized Appreciation On Investments With Allowance For Credit Losses Capitalizations Deferred Sale Inducement Cost, Capitalization Schedule of Balance Sheet Information, by Segment Schedule of Balance Sheet Information, by Segment [Table Text Block] Schedule of Balance Sheet Information, by Segment Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock, par value $0.01 per share Common stock Common Stock [Member] Fixed maturities, available for sale Debt Securities, Available-for-Sale Number of investments held by VIE, in default Number Of Investments Held By Variable Interest Entities, In Default Number Of Investments Held By Variable Interest Entities, In Default Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Borrowings Due May 2031 Rate at 4.057% Borrowings Due May 2031 Rate One [Member] Borrowings Due May 2031 Rate One Capital loss carryforward Capital Loss Carryforward Capital Loss Carryforward Health: Health Health Insurance Product Line [Member] Derivative Contract [Domain] Derivative Contract [Domain] Borrowings Due November 2027 Rate at 4.142% Borrowings Due November 2027 Rate [Member] Borrowings Due November 2027 Rate Financial Asset, Past Due Financial Asset, Past Due [Member] Total liabilities and shareholders' equity Liabilities and Equity Major Types of Investments [Axis] Major Types of Investments [Axis] Major Types of Investments Realized investment losses Total realized investment losses Total investment losses Realized Investment Gains (Losses) Employee Stock Option Share-Based Payment Arrangement, Option [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 70% to less than 80% Debt-To-Value Ratio, 70 To Less Than 80 Percent [Member] Debt-To-Value Ratio, 70 To Less Than 80 Percent [Member] Change in fair value, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Increase (Decrease) in Fair Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Increase (Decrease) in Fair Value Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Segments [Axis] Segments [Axis] Company-owned life insurance Life Insurance, Corporate or Bank Owned, Amount Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Available for sale fixed maturities classified as level 3, investment grade, percent Available for Sale Fixed Maturities with Significant Unobservable Inputs, Investment Grade, Percent Available for Sale Fixed Maturities with Significant Unobservable Inputs, Investment Grade, Percent No Trading Symbol Flag No Trading Symbol Flag Trading securities Total trading securities Debt Securities, Trading Tabular List, Table Tabular List [Table Text Block] Issuances Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance Name Awards Close in Time to MNPI Disclosures, Individual Name Discounted projected embedded derivatives Valuation Technique, Discounted Projected Embedded Derivatives [Member] Valuation Technique, Discounted Projected Embedded Derivatives Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Ceded premiums written Ceded Premiums Written Effect of changes in interest rates Market Risk Benefit, Increase (Decrease) from Interest Rate Change Debt-to-Value [Axis] Debt-to-Value [Axis] Market comparables Valuation, Market Approach [Member] Total segment revenues Total segment revenues Segment Revenues Segment Revenues Change in market values of the underlying options supporting fixed indexed products Change In Market Values Of The Underlying Options Supporting The Fixed Index Annuity And Life Products (Offset By Market Value Changes Credited To Policyholder Balances) Change In Market Values Of The Underlying Options Supporting The Fixed Index Annuity And Life Products (Offset By Market Value Changes Credited To Policyholder Balances) Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Estimated fair value of fixed maturity securities Variable Interest Entity, Fixed Maturity Securities Fair Value Estimated fair value of fixed maturity securities held by the VIE Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest expense Interest Paid, Excluding Capitalized Interest, Operating Activity Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Total assets carried at fair value by category Assets, Fair Value Disclosure Debt covenant, minimum required consolidated net worth, component two, as a percent of net equity proceeds received from issuance and sale of equity interests Debt Instrument, Covenant, Required Minimum Net Worth, Component Two, Percent Of Net Equity Proceeds Received From Issuance And Sale Of Equity Interests Debt Instrument, Covenant, Required Minimum Net Worth, Component Two, Percent Of Net Equity Proceeds Received From Issuance And Sale Of Equity Interests Name Measure Name Interest accretion Liability for Future Policy Benefit, Interest Expense Pay vs Performance Disclosure [Line Items] Adjusted beginning of period PVENP Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fixed indexed call options Equity Swap [Member] Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Debt Instrument [Line Items] Debt Instrument [Line Items] Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] Additional Paid-in Capital Additional Paid-in Capital [Member] Variable interest entities net realized gain (losses) on investments Variable Interest Entities Net Realized Gain (Loss) On Investments Variable Interest Entities Net Realized Gain (Loss) On Investments Current income taxes prepaid (accrued) Prepaid (Accrued) Income Taxes, Current Prepaid (Accrued) Income Taxes, Current Present value of future profits, deferred acquisition costs, and sales inducements Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost Increase (decrease) in equity securities, FV-NI, held at end of period Increase (Decrease) in Equity Securities, FV-NI, Held at End of Period Increase (Decrease) in Equity Securities, FV-NI, Held at End of Period Name Trading Arrangement, Individual Name Unrestricted Cash and Cash Equivalent Actual policyholder behavior different from expected behavior Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected Effect of actual variances from expected experience Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience Realized investment gains (losses): Realized Investment Gains (Losses) [Abstract] Income tax assets, net Income tax assets, net Income tax assets, net Deferred Income Tax Assets, Net, Including Net of Current Income Tax Payable Deferred Income Tax Assets, Net, Including Net of Current Income Tax Payable Funding agreements Funding Agreement-Backed Note [Member] Funding Agreement-Backed Note Company Selected Measure Amount Company Selected Measure Amount Schedule of Reconciliation of Segment Revenues and Expenses to Consolidated Revenues and Expenses and Net Income (Loss) Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Total fixed maturities, available for sale Total Fixed Maturities, Available For Sale [Member] Total Fixed Maturities, Available For Sale [Member] Amortization and depreciation Depreciation, Depletion and Amortization SOFR Secured Overnight Financing Rate (SOFR) [Member] Schedule of Other Significant Noncash Transactions Schedule of Other Significant Noncash Transactions [Table Text Block] Unobservable inputs, equity securities Equity Securities, FV-NI, Measurement Input Reduction for securities disposed during the period Reduction for securities disposed during the period Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold Non-PEO NEO Non-PEO NEO [Member] Policyholder account values, end of period for contracts 100% ceded Policyholder Account Balance, Contract Fully Ceded Policyholder Account Balance, Contract Fully Ceded Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Gross deferred tax assets Deferred Tax Assets, Gross Variable interest entity gross unrealized losses fixed maturity securities Variable Interest Entity Gross Unrealized Losses Fixed Maturity Securities Gross unrealized losses of fixed maturity securities held by the VIE Number Of Reportable Segments Disclosed By Definition Flag Number Of Reportable Segments Disclosed By Definition Flag Number Of Reportable Segments Disclosed By Definition Flag Greater than 150 basis points above Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater [Member] Net income Net income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Investment income not allocated to product lines Investment Income Not Allocated To Product Lines Investment Income Not Allocated To Product Lines Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] 2025 Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year Restatement Determination Date: Restatement Determination Date [Axis] Market Risk Benefit [Roll Forward] Market Risk Benefit [Roll Forward] Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] General account assets Net Investment Income On General Account Invested Assets Net investment income on general account invested assets excludes income (loss) related to: (i) the change in the fair value of options purchased in an effort to hedge certain benefits accruing to the policyholders of our equity-indexed products; (ii) trading account securities; (iii) change in value of embedded derivatives related to modified coinsurance agreements; and (iv) Company-only life insurance which was purchased as an investment vehicle to fund a deferred compensation plan. Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Subtotal Available For Sale Securities, Debt Maturities, Amortized Cost, Excluding Structured Securities Available For Sale Securities, Debt Maturities, Amortized Cost, Excluding Structured Securities Revenues: Revenues: Revenues [Abstract] Amount of reserves above (below) policyholder account values Amount of reserves above (below) policyholder account values Policyholder Account Balance, Amount Of Reserves Policyholder Account Balance, Amount Of Reserves Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Number of mortgage loans noncurrent Financing Receivable, Number Of Loans Noncurrent Financing Receivable, Number Of Loans Noncurrent Shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] Policyholder Account Balance [Line Items] Policyholder Account Balance [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus Total expenses Insurance Product Line Expense Insurance Product Line Expense Issuance of investment borrowings: Proceeds from Issuance of Long-Term Debt [Abstract] Common stock ($0.01 par value, 8,000,000,000 shares authorized, shares issued and outstanding: June 30, 2026 – 92,696,990; December 31, 2025 – 94,484,339) Common Stock, Value, Issued Interest expense Interest expense Interest Expense, Operating and Nonoperating Borrowings Due June 2027 at 4.213% Borrowings Due June 2027 Rate Two [Member] Borrowings Due June 2027 Rate Two Schedule of Long-Term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Embedded derivatives associated with fixed indexed annuity products Embedded derivatives related to fixed indexed annuity products Embedded Derivative, Fair Value of Embedded Derivative Liability Revolving Credit Agreement Line of Credit [Member] Restatement Determination Date Restatement Determination Date Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Effect of changes in discount rate assumptions, beginning of period Effect of changes in discount rate assumptions, end of period AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax Amendment Flag Amendment Flag Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Net investment income Net Investment Income Gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Coinsurance Embedded derivative related to modified coinsurance agreement Coinsurance [Member] Coinsurance [Member] Beginning PVEFPB at original discount rate Ending PVEFPB at original discount rate Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance Investments [Domain] Investments [Domain] Federal Home Loan Bank Advances Federal Home Loan Bank Advances [Member] Insurance policy benefits Insurance Policy Benefits Amounts paid to policyholders during the period pursuant to the terms of the insurance contracts. Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Indirect costs allocable to self-constructed real estate assets Deferred Tax Assets, Indirect Costs Allocable to Self-Constructed Real Estate Assets Deferred Tax Assets, Indirect Costs Allocable to Self-Constructed Real Estate Assets Entity Address, State or Province Entity Address, State or Province Policyholder account balance, above guaranteed minimum crediting rate Policyholder Account Balance, above Guaranteed Minimum Crediting Rate Allocated expenses Allocated Expenses [Member] Allocated Expenses [Member] Borrowings Due May 2029 at 4.263% Borrowings Due May 2029 Rate [Member] Borrowings Due May 2029 Rate PEO Total Compensation Amount PEO Total Compensation Amount Other expenses Other Cost and Expense (Income), Operating Other Cost and Expense (Income), Operating Fixed interest annuities Fixed Interest Annuities [Member] Fixed Interest Annuities Assets: Assets: Assets, Fair Value Disclosure [Abstract] Total amortized cost Variable Interest Entity Amortized Cost Securities Held Amortized cost of fixed maturity securities held by the VIE Amortization and non-deferred commissions Amortization And Non-Deferred Commissions Amortization And Non-Deferred Commissions Cash and cash equivalents: Cash and Cash Equivalents, Fair Value Disclosure [Abstract] Cash and Cash Equivalents, Fair Value Disclosure [Abstract] Notional amount Derivative, Notional Amount Weighted average shares outstanding (in shares) Weighted average shares outstanding for basic earnings per share (in shares) Weighted Average Number of Shares Outstanding, Basic Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Other invested assets Investments and Other Noncurrent Assets Deferral of policy acquisition costs and sales inducements Increase (Decrease) in Deferred Policy Acquisition Costs Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Schedule of Changes in the Allowance for Current Expected Credit Losses Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block] Investments: Investments [Abstract] Due after five years through ten years Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Premiums less benefits Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Premiums Less Benefits Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Premiums Less Benefits Cash and cash equivalents - unrestricted Cash And Cash Equivalents, At Carrying Value, Excluding Variable Interest Entities Cash And Cash Equivalents, At Carrying Value, Excluding Variable Interest Entities Amortized cost Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Life: Life Life Insurance Product Line [Member] Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Accounting Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Net income for basic earnings per share Net Income (Loss) Available to Common Stockholders, Basic Insurance liabilities Increase (Decrease) in Insurance Liabilities Line of credit maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Policyholder account values, beginning of period excluding contracts 100% ceded Policyholder account values, end of period excluding contracts 100% ceded Policyholder Account Balance, Excluding fully Ceded Contracts Policyholder Account Balance, Excluding fully Ceded Contracts Collateralized loan obligations Collateralized Debt Obligations [Member] Net state operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, State and Local Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Recently Adopted/Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Fair value of level 3 fixed maturity securities and trading securities valued using broker quotes, percentage Fair Value, Fixed Maturity Securities Valued Using Broker Quotes, Percentage Fair Value, Fixed Maturity Securities Valued Using Broker Quotes, Percentage Debt covenant, minimum required consolidated net worth, component one, amount Debt Instrument, Covenant, Required Minimum Consolidated Net Worth, Component One, Amount Debt Instrument, Covenant, Required Minimum Consolidated Net Worth, Component One, Amount Payments on investment borrowings: Payments for (Proceeds from) Investments, Alternative [Abstract] Schedule of Policyholder Account Balance, Guaranteed Minimum Crediting Rate Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Table Text Block] Related to variable interest entities Repayments of Investment Borrowings Related to Variable Interest Entities Repayments of Investment Borrowings Related to Variable Interest Entities Income taxes Increase (Decrease) in Income Taxes Payable Net cash used by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Cash collateral received Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Insurance Product Lines Insurance Product Lines Segment [Member] Insurance Product Lines Segment [Member] SHAREHOLDERS' EQUITY Equity [Text Block] Future loss reserves Liability For Future Policy Benefits Payment For Benefits, Reserve Liability For Future Policy Benefits Payment For Benefits, Reserve Security Exchange Name Security Exchange Name Borrowings related to variable interest entities Borrowings Related To Variable Interest Entities, Fair Value Disclosure Borrowings Related To Variable Interest Entities, Fair Value Disclosure Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Carrying value of loans Total amortized cost Financing Receivable, before Allowance for Credit Loss Total liabilities carried at fair value Liabilities, Fair Value Disclosure 12 months or greater Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Business Segments Segment Reporting, Policy [Policy Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Borrowings Due May 2031 Rate at 4.142% Borrowings Due May 2031 Rate Three [Member] Borrowings Due May 2031 Rate Three Investments held by variable interest entities, allowance for credit losses Investments Held By Variable Interest Entities, Allowance For Credit Loss Investments Held By Variable Interest Entities, Allowance For Credit Loss Ownership change threshold restricting NOL usage Ownership Change Threshold Restricting Net Operating Loss Usage Ownership Change Threshold Restricting Net Operating Loss Usage Amortization expense Deferred Sales Inducement Cost, Amortization Expense Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Expected future benefits and expenses (Undiscounted) Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance Effect of dilutive securities on weighted average shares: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Residential Mortgage Residential Mortgage [Member] Asset Class [Domain] Asset Class [Domain] Federal Home Loan Bank Payments of FHLBank Borrowings, Financing Activities Investments held by variable interest entities (net of allowance for credit losses: June 30, 2026 - $1.6 and December 31, 2025 - $0.6; amortized cost: June 30, 2026 - $296.2 and December 31, 2025 - $294.1) Investments held by variable interest entities - corporate securities Investments held by variable interest entities Investments Held By Variable Interest Entities Total of fixed maturity securities of consolidated variable interest entities where we are the primary beneficiary. Capital loss carryforwards Deferred Tax Assets, Capital Loss Carryforwards Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average shares outstanding (in shares) Weighted average shares outstanding for diluted earnings per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Investment Rating [Domain] Investment Rating [Domain] Investment Rating [Domain] Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss, Fair Value Option Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss, Fair Value Option Entity Emerging Growth Company Entity Emerging Growth Company 2026 Financing Receivable, Year One, Originated, Current Fiscal Year Underlying Security Market Price Change Underlying Security Market Price Change, Percent Annuity: Annuity Life and Annuity Insurance Product Line [Member] Accrued investment income Accrued investment income Accrued Investment Income Receivable Gross premiums Liability for Future Policy Benefit, Gross Premium Income Reinsurance receivables (net of allowance for credit losses: June 30, 2026 - $1.0 and December 31, 2025 - $1.0) Reinsurance Recoverable for Paid Claims and Claims Adjustments Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] 2024 Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year Borrowings Due December 2026 at 4.092% Borrowings Due December 2026 Rate [Member] Borrowings Due December 2026 Rate Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Net liability, end of period, net of reinsurance Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change All Executive Categories All Executive Categories [Member] Borrowings Due January 2027 at 4.046% Borrowings Due January 2027 Rate One [Member] Borrowings Due January 2027 Rate One Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Jeremy D. Williams [Member] Jeremy D. Williams Embedded Derivative Related to Fixed Maturity Securities Embedded derivatives Embedded Derivative Financial Instruments [Member] Number of policyholders Number of Policyholders Number of Policyholders Schedule of Earnings Per Share Reconciliation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Borrowings Due December 2027 at 4.138% Borrowings Due December 2027 Rate One [Member] Borrowings Due December 2027 Rate One Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Domain] Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Domain] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Capitalizations Deferred Policy Acquisition Cost, Capitalization Schedule of the Reconciliation for Net Income Provided by Operating Activities Reconciliation Of Net Income To Net Cash Provided By Operating Activities [Table Text Block] Reconciliation Of Net Income To Net Cash Provided By Operating Activities [Table Text Block] BUSINESS SEGMENTS Segment Reporting [Text Block] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] INVESTMENTS IN VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Liabilities: Liabilities: Liabilities [Abstract] Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Premiums received (premiums collected from inforce business) Policyholder Account Balance, Premium Received Maturities and redemptions of investments Maturities And Redemptions Of Investments Maturities and redemptions of investments during the period primarily resulting from actively managed fixed maturities. Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Payments on notes payable Repayments of Notes Payable Borrowings Due July 2027 at 4.378% Borrowings Due July 2027 Rate Two [Member] Borrowings Due July 2027 Rate Two Other liabilities Other liabilities Other Liabilities Deferred Policy Acquisition Cost [Table] Deferred Policy Acquisition Cost [Table] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Expenses related to divested business Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Expenses Related to Divested Business Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Expenses Related to Divested Business Other non-life companies Other Nonlife Companies [Member] Other Nonlife Companies [Member] Jeanne L. Linnenbringer [Member] Jeanne L. Linnenbringer Borrowings Due January 2028 at 4.093% Borrowings Due January 2028 Rate Two [Member] Borrowings Due January 2028 Rate Two Gross realized gains on sales of fixed maturities, available for sale Debt Securities, Available-for-Sale, Realized Gain Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Borrowings Due January 2031 at 4.178% Borrowings Due January 2031 Rate One [Member] Borrowings Due January 2031 Rate One Segment Reporting [Line Items] Segment Reporting [Line Items] Borrowings Due September 2027 at 4.146% Borrowings Due September 2027 Rate One [Member] Borrowings Due September 2027 Rate One Document Quarterly Report Document Quarterly Report Change in discount rates for liability for future policy benefits Accumulated Other Comprehensive Income (Loss), Changes in Discount Rate for Liability for Future Policy Benefit Accumulated Other Comprehensive Income (Loss), Changes in Discount Rate for Liability for Future Policy Benefit Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] States and political subdivisions US States and Political Subdivisions Debt Securities [Member] Purchases of fixed maturity securities containing embedded derivatives Purchases of Fixed Maturity Securities Containing Embedded Derivatives Purchases of Fixed Maturity Securities Containing Embedded Derivatives Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Deferred acquisition costs and sales inducements Deferred Policy Acquisition Cost Measurement Input Type [Domain] Measurement Input Type [Domain] Gains (losses) included in net income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Effect of changes in the instrument-specific credit risk, beginning of period Effect of changes in the instrument-specific credit risk, end of period Market Risk Benefit, Effect of Changes in Instrument-Specific Credit Risk Market Risk Benefit, Effect of Changes in Instrument-Specific Credit Risk Commercial mortgage loans Policy loans Loans Receivable, Fair Value Disclosure Benefits and expenses: Expenses: Benefits, Losses and Expenses [Abstract] Adoption Date Trading Arrangement Adoption Date Paul H. McDonough, Performance Share Grants [Member] Paul H. McDonough, Performance Share Grants Variable interest entity, allowance for credit losses fixed maturity securities Variable Interest Entity, Fixed Maturity Securities, Allowance For Credit Loss Variable Interest Entity, Fixed Maturity Securities, Allowance For Credit Loss Net investment income Proceeds from Interest and Dividends Received Insurance policy benefits related to reinsurance assumed Policyholder Benefits and Claims Incurred, Assumed Equity securities at fair value Equity securities - corporate securities Equity Securities, FV-NI, Current Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3, Net Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Schedule of Changes in Market Risk Benefits Market Risk Benefit, Activity [Table Text Block] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Borrowings Due February 2031 at 4.240% Borrowings Due February 2031 Rate Two [Member] Borrowings Due February 2031 Rate Two Commercial Portfolio Segment Commercial Portfolio Segment [Member] Borrowings Due January 2028 at 4.103% Borrowings Due January 2028 Rate One [Member] Borrowings Due January 2028 Rate One Embedded derivative Embedded Derivative, Fair Value of Embedded Derivative, Net Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Policy charges Policyholder Account Balance, Policy Charge Weighted Average Weighted Average [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Other Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation 1-50 basis points above Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 [Member] Net liability for future policy benefits Liability for Future Policy Benefit, before Reinsurance Residential Portfolio Segment Residential Portfolio Segment [Member] Income Statement [Abstract] Income Statement [Abstract] Shareholders' equity: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Weighted average duration Liability for Future Policy Benefit, Weighted-Average Duration Total investment losses Total investment losses Gain (Loss) on Investments 0.00%-2.99% Policyholder Account Balance, Guaranteed Minimum Crediting Range, Range from 0000 to 0299 [Member] Policyholder Account Balance, Guaranteed Minimum Crediting Range, Range from 0000 to 0299 Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net unrealized losses on investments having no allowance for credit losses Accumulated Other Comprehensive Income (Loss), Net Unrealized Appreciation On Investments Having No Allowance For Credit Losses Accumulated Other Comprehensive Income (Loss), Net Unrealized Appreciation On Investments Having No Allowance For Credit Losses Liabilities related to separate accounts Separate Account, Liability City Area Code City Area Code Borrowings Due January 2027 at 4.150% Borrowings Due January 2027 Rate Three [Member] Borrowings Due January 2027 Rate Three Borrowings Due January 2028 at 4.110% Borrowings Due January 2028 Rate Five [Member] Borrowings Due January 2028 Rate Five Document Information [Table] Document Information [Table] Litigation, verdict infavor of the class representatives amount Litigation, Verdict In Favor of Class Representatives Amount Litigation, Verdict In Favor of Class Representatives Amount Borrowings Due July 2028 at 4.000% Borrowings Due July 2028 Rate Two [Member] Borrowings Due July 2028 Rate Two Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Collateral Loans Receivable, Collateral, Fair Value Disclosure Loans Receivable, Collateral, Fair Value Disclosure Policyholder and other special-purpose portfolios Net Investment Income On Policyholder And Reinsurer Accounts And Other Special Purpose Portfolios Such amount represents net investment income (loss) related to: (i) the change in the fair value of options purchased in an effort to hedge certain potential benefits accruing to the policyholders of our equity-indexed products; (ii) trading account securities; (iii) change in value of embedded derivatives related to modified coinsurance agreements; and (iv) Company-only life insurance which was purchased as an investment vehicle to fund the deferred compensation plan for certain agents. Non-operating Loss Carryforwards Non-operating Loss Carryforwards Non-operating Loss Carryforwards Policyholder Account Balance [Table] Policyholder Account Balance [Table] Policyholder account balances Liabilities For Interest Sensitive Products, Excluding Embedded Derivatives Liabilities For Interest Sensitive Products, Excluding Embedded Derivatives Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Range of guaranteed minimum crediting rates Policyholder Account Balance, Guaranteed Minimum Credit Rating Borrowings Due April 2031 Rate at 232% Borrowings Due April 2031 Rate Four [Member] Borrowings Due April 2031 Rate Four Borrowings related to variable interest entities Borrowings related to variable interest entities Borrowings Related To Variable Interest Entities The borrowings of the variable interest entities that are to be repaid from available cash flows from the assets of the variable interest entities. Gross deferred tax liabilities Deferred Tax Liabilities, Net Net liability for future policy benefits, net of reinsurance recoverable Liability for Future Policy Benefit, after Reinsurance Investment borrowings Investment Borrowings, Fair Value Disclosure Investment Borrowings, Fair Value Disclosure Gross amounts offset in the balance sheet Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Measurement Basis [Axis] Measurement Basis [Axis] Common stock repurchased (in shares) Stock repurchased and retired during period (in shares) Stock Repurchased and Retired During Period, Shares Other invested assets: Life Insurance, Corporate Or Bank Owned, Fair Value Disclosure [Abstract] Life Insurance, Corporate Or Bank Owned, Fair Value Disclosure [Abstract] Reinsurance Contract Reinsurance Contract [Member] Reinsurance Contract [Member] Other, net Other Securities, Available-for-Sale, Realized Loss Other Securities, Available-for-Sale, Realized Loss Paul H. McDonough [Member] Paul H. McDonough Non-performance risk spread Measurement Input, Non-Performance Risk Spread [Member] Measurement Input, Non-Performance Risk Spread Total investments Investments Variable interest entity, gross unrealized gains fixed maturity securities Variable Interest Entity, Gross Unrealized Gains Fixed Maturity Securities Variable Interest Entity, Gross Unrealized Gains Fixed Maturity Securities Unrealized gains (losses) on investments OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One 2022 Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List Not Disclosed Flag Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List Not Disclosed Flag Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List Not Disclosed Flag 2023 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Fair Value Measurement Inputs Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Entity Current Reporting Status Entity Current Reporting Status Net cash provided (used) by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Liabilities: Liabilities, Fair Value Disclosure [Abstract] Liabilities, Fair Value Disclosure [Abstract] Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year Adjustments to reconcile net income to net cash from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Borrowings Due April 2030 at 4.320% Borrowings Due April 2030 Rate [Member] Borrowings Due April 2030 Rate Federal long-term tax exempt rate Federal Long Term Tax Exempt Rate Federal Long Term Tax Exempt Rate Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Residual tranches Other Invested Assets, Residual Tranches Other Invested Assets, Residual Tranches Financial Instruments [Domain] Financial Instruments [Domain] 51-150 basis points above Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 [Member] Number of mortgage loans in process of foreclosure Number of Mortgage Loans in Process of Foreclosure Number of Mortgage Loans in Process of Foreclosure Derivatives Net amounts of assets presented in the balance sheet Derivative Asset Underlying Securities Award Underlying Securities Amount Total estimated fair value Estimate of Fair Value Measurement [Member] Other assets Other Assets, Net Other Assets, Net Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Other Financial Instrument, Other [Member] Beginning PVENP at original discount rate Ending PVENP at original discount rate Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance Borrowings Due February 2028 at 4.149% Borrowings Due February 2028 Rate Three [Member] Borrowings Due February 2028 Rate Three Other, net Payment for (Proceeds from) Other Investing Activity Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Other Policyholder Account Balance, Increase (Decrease) from Other Change DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS Insurance Contract, Acquisition Cost [Text Block] 6.450% Senior Notes due June 2034 Senior Note 6.450 Percent June 2034 [Member] Senior Note 6.450 Percent June 2034 Segment Reporting [Table] Segment Reporting [Table] Deferred liability Liability for Future Policy Benefit, Deferred Profit Liability Liability for Future Policy Benefit, Deferred Profit Liability Foreclosure Foreclosure [Member] Foreclosure [Member] Schedule of Fixed Maturities for Available for Sale Securities Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Balance at beginning of the period Balance at end of the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Borrowings Due February 2028 at 4.115% Borrowings Due February 2028 Rate Four [Member] Borrowings Due February 2028 Rate Four Mortgage loans SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Current Fiscal Year End Date Current Fiscal Year End Date Current discount rate Liability for Future Policy Benefit, Current Weighted-Average Discount Rate Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Expenses related to TechMod initiative Communications and Information Technology Accrual, amortization and fair value changes included in investment income Change In Accrued Investment Income, Amortization Of Premium Or Discount On Investments And Fair Value Of Investments Change In Accrued Investment Income, Amortization Of Premium Or Discount On Investments And Fair Value Of Investments Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Schedule of Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Investment Borrowings [Abstract] Investment Borrowings [Abstract] Investment Borrowings [Abstract]. Unobservable inputs, fixed maturities Debt Securities, Available-for-Sale, Measurement Input Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Schedule of Impact on Balance Sheet of Consolidating Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Borrowings Due February 2028 at 4.098% Borrowings Due February 2028 Rate Two [Member] Borrowings Due February 2028 Rate Two Carryforward Expiration [Domain] Carryforward Expiration [Domain] Carryforward Expiration [Domain]. Insurance policy income Insurance policy income Premiums Earned, Net Impact of annual option forfeitures related to fixed indexed annuity surrenders Impact of Forfeited Annual Forward Options Purchased Related to Fixed Indexed Annuities Impact of Forfeited Annual Forward Options Purchased Related to Fixed Indexed Annuities Partial withdrawal rates Measurement Input, Withdrawal Rate [Member] Other operating costs Payment for Other Operating Activity Equity Components [Axis] Equity Components [Axis] Other operating costs and expenses Other expenses Other Cost and Expense, Operating Income taxes Income Tax Paid, after Refund Received Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Adjusted net liability for future policy benefits Adjusted net liability for future policy benefits Liability for Future Policy Benefits, Adjusted, Net Liability for Future Policy Benefits, Adjusted, Net Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Entity Small Business Entity Small Business Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unearned and advanced premiums Unearned Premiums Unamortized discount on 6.450% Senior Notes due June 2034 Debt Instrument, Unamortized Discount Major Types of Investments [Domain] Major Types of Investments [Domain] Major Types of Investments Borrowings Due April 2027 Rate at 4.008% Borrowings Due April 2027 Rate [Member] Borrowings Due April 2027 Rate Amounts netted in expenses not allocated to product lines Expenses Not Allocated To Product Lines [Member] Expenses Not Allocated To Product Lines [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Expenses not allocated to product lines Expenses Not Allocated To Product Lines Expenses Not Allocated To Product Lines Interest accrual Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Gain on extinguishment of borrowings related to variable interest entities Gain on extinguishment of borrowings related to variable interest entities Gain (Loss) on Extinguishment of Debt Fixed maturities, available for sale, allowance for credit losses Allowance for credit losses Allowance at the beginning of the period Allowance at the end of the period Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Unobservable inputs, market risk benefit, liability measurement input Market Risk Benefit, Liability Measurement Input Market Risk Benefit, Liability Measurement Input Other Other [Member] Other Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Local Phone Number Local Phone Number Number of product lines Number of Product Lines Number of Product Lines Other comprehensive income (loss) before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Income before income taxes Income before tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Commitments and Contingencies (Note 14) Commitments and Contingencies Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Debt covenant, actual debt to total capitalization ratio at period end Debt Instrument, Covenant, Actual Debt To Total Capitalization Ratio Debt Instrument, Covenant, Actual Debt To Total Capitalization Ratio Trading Securities Trading Securities [Member] Trading Securities Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Embedded derivatives related to fixed indexed annuities at fair value Equity Index Annuities - Embedded Derivative [Member] Equity Index Annuities - Embedded Derivative [Member] Policyholder account balances Policyholder account balances Policyholder Account Balance Executive Category: Executive Category [Axis] Issuances (funds collected from new business) Policyholder Account Balance, Issuance Borrowings Due June 2027 at 3.009% Borrowings Due June 2027 Rate One [Member] Borrowings Due June 2027 Rate One LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] THIRD-PARTY REINSURANCE Reinsurance [Text Block] Fee revenue related to divested business Revenue Related to Transition and Support Services Agreements Revenue Related to Transition and Support Services Agreements 5.125% Subordinated Debentures due 2060 5.125% Subordinated Debentures due 2060 5.125% Subordinated Debentures due 2060 [Member] 5.125% Subordinated Debentures due 2060 [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount PVENP, end of period Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change Investments held in limited partnerships Investments Held In Limited Partnerships Investments Held In Limited Partnerships Borrowings Due January 2027 at 4.125% Borrowings Due January 2027 Rate Two [Member] Borrowings Due January 2027 Rate Two Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Unamortized debt issue costs Debt Issuance Cost, Gross, Noncurrent Adjustment to discount rate for liability for future policy benefits Other Comprehensive Income (Loss), Adjustment To Discount Rate For Liability For Future Policy Benefits Other Comprehensive Income (Loss), Adjustment To Discount Rate For Liability For Future Policy Benefits PEO Name PEO Name Stock options, restricted stock, performance units, and Employee Stock Purchase Program Share Based Compensation, Noncash Portion Share Based Compensation, Noncash Portion Borrowings Due August 2028 at 4.010% Borrowings Due August 2028 Rate One [Member] Borrowings Due August 2028 Rate One Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Borrowings Due May 2030 Rate at 4.328% Borrowings Due May 2030 Rate One [Member] Borrowings Due May 2030 Rate One Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Axis] Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Axis] Notes payable – direct corporate obligations Outstanding principal Notes Payable Benefit payments Policyholder Account Balance, Benefit Payment Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Base Rate Base Rate [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Investment income not allocated to product lines Net Investment Income Not Allocated To Product Lines [Member] Net Investment Income Not Allocated To Product Lines Fixed indexed call options Equity Contract [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Foreign governments Foreign Government Debt [Member] Allocated expenses Allocated Expenses Allocated Expenses Cash surrender value, net of reinsurance Policyholder Account Balance, Cash Surrender Value Net income (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Present value of future profits Beginning of period End of period Present Value of Future Insurance Profits, Net Net operating income Operating Income (Loss), Net Of Tax Operating Income (Loss), Net Of Tax Insider Trading Arrangements [Line Items] Sales of investments Sales Of Investments Sales of investments during the period primarily resulting from sales of actively managed fixed maturities. Amortization expense Deferred Policy Acquisition Costs, Amortization Expense Reserves excluded from rollforward Liability for Future Policy Benefit, Before Reinsurance Reserve Liability for Future Policy Benefit, Before Reinsurance Reserve Investments held by variable interest entities, amortized cost Investments Held By Variable Interest Entities, Amortized Cost Investments Held By Variable Interest Entities, Amortized Cost Change in instrument-specific credit risk for market risk benefits Accumulated Other Comprehensive Income (Loss), Changed in instrument Specific Credit Risk For Market Risk Benefits Accumulated Other Comprehensive Income (Loss), Changed in instrument Specific Credit Risk For Market Risk Benefits Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Fee revenue Fee And Other Revenue Segment [Member] Fee And Other Revenue Segment [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Insurance [Abstract] Insurance [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Other Invested Assets Other Invested Assets [Member] Other Invested Assets [Member] Net deferred tax assets Deferred tax assets more likely than not to be realized through future taxable earnings Deferred Tax Assets, Net Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] LIABILITIES FOR INSURANCE PRODUCTS Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Less than 60% Debt-To-Value Ratio, Less Than 60 Percent [Member] Debt-To-Value Ratio, Less Than 60 Percent [Member] Variable interest entity, gross investment losses from sale Variable Interest Entity, Investments, Gross Investment Losses From Sale, Before Tax Variable Interest Entity, Investments, Gross Investment Losses From Sale, Before Tax Schedule of Deferred Sale Inducement Cost Deferred Sale Inducement Cost [Table Text Block] DERIVATIVES Derivatives and Fair Value [Text Block] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Commercial mortgage-backed securities Commercial Mortgage-Backed Securities [Member] 5.250% Senior Notes due May 2029 Senior Note 5.250 Percent May 2029 [Member] Senior Note 5.250 Percent May 2029 [Member] Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Schedule of Terms of Federal Home Loan Bank Borrowing Schedule of Terms of Federal Home Loan Bank Borrowing [Table Text Block] Schedule of Terms of Federal Home Loan Bank Borrowing [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Effect of changes in equity index volatility Market Risk Benefit, Increase (Decrease) from Volatility Change in fair value of market risk benefits Market Risk Benefit, Change in Fair Value, Gain (Loss) Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Investments Investment, Policy [Policy Text Block] Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Policyholder account balances Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangements Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangements Balance, end of period, net of reinsurance Policyholder Account Balance, Net of Reinsurance Policyholder Account Balance, Net of Reinsurance INCOME TAXES Income Tax Disclosure [Text Block] Schedule Pre-Tax Gains (Losses) Recognized in Net Income for Derivative Instruments Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Debt Securities, Available-for-sale, Allowance for Credit Loss [Table] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table] Entity Filer Category Entity Filer Category Total Debt Securities, Available-for-Sale, Unrealized Loss Position Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Deferred income tax assets Accumulated Other Comprehensive Income (Loss), Deferred Income Tax Liabilities Accumulated Other Comprehensive Income (Loss), Deferred Income Tax Liabilities Net investment losses Gain (Loss) on Investments, Excluding Cash Expenses Gain (Loss) on Investments, Excluding Cash Expenses Advertising expense Advertising Expense Net pre-tax impact Gain (Loss) on Derivative Instruments, Net, Pretax Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Net investment income: Net Investment Income [Abstract] Notes payable of VIEs held by subsidiaries Variable Interest Entity Notes Payable Held By Insurance Subsidiaries Variable Interest Entity Notes Payable Held By Insurance Subsidiaries Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Non-life companies included in the fee income segment Nonlife Companies Included In Fee Income Segment [Member] Nonlife Companies Included In Fee Income Segment [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Total benefits and expenses Benefits, Losses and Expenses Total income tax expense Income Tax Expense (Benefit) Borrowings Due January 2031 at 4.179% Borrowings Due January 2031 Rate Three [Member] Borrowings Due January 2031 Rate Three Effect of changes in equity markets Market Risk Benefit, Increase (Decrease) from Equity Market Change PVEFPB, end of period Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change Consolidation Consolidation, Policy [Policy Text Block] Total policyholder account values Policyholder Account Balance, Gross Policyholder Account Balance, Gross Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Investments Deferred Tax Liabilities, Investments Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Discounted cash flow analysis Valuation Technique, Discounted Cash Flow [Member] Statement [Table] Statement [Table] Segment Reconciling Items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Surrender rates Measurement Input, Surrender Rate [Member] Measurement Input, Base Lapse Rate Fixed indexed call options Gross amounts recognized Derivative Asset, Subject to Master Netting Arrangement, before Offset Expected future gross premiums (Discounted) Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance Policyholder Account Balance [Roll Forward] Policyholder Account Balance [Roll Forward] Medicare supplement Medicare Supplement [Member] Medicare Supplement Annuity Annuity [Member] Annuity Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]