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of Policyholder Contract Obligations Repayments of Secured Debt Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net Realized Investment Gains, Impairment Losses, and Other Net Realized Investment Gains (Losses), Impairment Losses, And Other Net Realized Investment Gains (Losses), Impairment Losses, And Other Entity Tax Identification Number Entity Tax Identification Number Credit Loss Status [Axis] Credit Loss Status [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Investment grade External Credit Rating, Investment Grade [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] Basis of Presentation and Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total Comprehensive (Loss) Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Losses on Sales Loss on Sale of Other Investments Loss on Sale of Other Investments Total Alternative Investments Alternative Investments [Member] Alternative Investments [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Cash surrender value for policyholder obligations Policyholder Account Balance, Cash Surrender Value Basic (in dollars per share) Basic Net (Loss) Income Per Unrestricted Share (in shares) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Insider Trading Arrangements [Line Items] Long-term Debt, Non-Current, at Amortized Cost Long-Term Debt, Excluding Current Maturities Income tax expense (benefit) attributable to Kemper Corporation Income Tax Expense (Benefit) Attributable to Parent Income Tax Expense (Benefit) Attributable to Parent Life Life [Member] Life [Member] Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Amortization Expense Deferred Policy Acquisition Costs, Amortization Expense 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] Pre-tax gain on sale Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Insurance [Abstract] Insurance [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Effect of Changes in Cash Flow Assumptions Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change Equity Awards Adjustments Equity Awards Adjustments [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Equity Securities, Industry [Domain] Industry Sector [Domain] Plan Name [Axis] Plan Name [Axis] Receivables from Policyholders Increase (Decrease) in Premiums Receivable Management fee percentage Management Fee, Percentage Management Fee, Percentage Property and Casualty Insurance Reserves Liability for Future Policyholder Benefits Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Other Other Debt Obligations [Member] Repayment of Long-term Debt Repayments of Senior Debt Short-term Investments Short-Term Investments [Member] Kemper Corporation Shareholders’ Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Undiscounted Expected Gross Premiums and Expected Future Benefit Payments Undiscounted Expected Gross Premiums and Expected Future Benefit Payments [Table Text Block] Undiscounted Expected Gross Premiums and Expected Future Benefit Payments Schedule of Net Realized Gains (Losses) Schedule of Realized Gain (Loss) [Table Text Block] Mortgage Loans Mortgage Loans [Member] Mortgage Loans [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Income Taxes Income Tax Disclosure [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 Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Cash paid during the year for: Supplemental Cash Flow Elements [Abstract] Revision of Prior Period [Axis] Revision of Prior Period [Axis] Due in One Year or Less Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Proceeds from Policyholder Contract Obligations Proceeds from (Repayments of) Secured Debt Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract] Equity Method Investments and Joint Ventures [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Entity Address, Address Line Two Entity Address, Address Line Two Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Net (Loss) Income Net (Loss) Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Total Expenses Total Expenses Benefits, Losses and Expenses Income Tax (Benefit) Expense Income Tax Expense Income Tax Expense (Benefit) Collateralized Loan Obligations Collateralized Loan Obligations [Member] Equity Funds Equity Funds [Member] Balance, Beginning of Period Balance, End of Period Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change Receivables from Policyholders Premiums Receivable, Net Premiums Receivable, Net Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Goodwill of disposal group Disposal Group, Including Discontinued Operation, Goodwill Statement [Table] Statement [Table] Catastrophic Event [Axis] Catastrophic Event [Axis] Non-Core Operations Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Exchange Traded Funds Exchange Traded Funds [Member] Expected Future Gross Premiums, discounted Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance Investment Holdings, Other than Securities Investment Holdings, Other than Securities [Table Text Block] Share-based Payment Arrangement Share-Based Payment Arrangement [Member] Percentage of unrealized loss position to amortized cost basis of available for sale security average Percentage of Unrealized Loss Position to Amortized Cost Basis of Available for Sale Security Average Percentage of Unrealized Loss Position to Amortized Cost Basis of Available for Sale Security Average Redeemable Preferred Stocks Mandatorily Redeemable Preferred Stock [Member]