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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense (benefit) attributable to Kemper Corporation | $ (7,900,000) | $ 18,900,000 | $ 34,000,000.0 | $ 53,400,000 |
Effective income tax rate reconciliation, percent | 27.30% | 20.40% | 18.30% | 19.50% |
Unrecognized Tax Benefits | $ 0 |  | $ 0 |  | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 0 | $ 0 | 0 | $ 0 |
Income Tax Paid, Federal, after Refund Received |  |  | 20,500,000 | 9,900,000 |
Income Tax Paid, State and Local, after Refund Received |  |  | 1,700,000 | 600,000 |
Foreign Tax Jurisdiction |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Proceeds from Income Tax Refunds |  |  | $ 0 | $ 0 |

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