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Income Taxes (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense (benefit) attributable to Kemper Corporation | $ 18,400,000 | $ 17,700,000 | $ 41,900,000 | $ 34,500,000 |
Effective income tax rate reconciliation, percent | 20.20% | 19.00% | 19.60% | 19.00% |
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 | 5,600,000 |
Income Tax Paid, State and Local, after Refund Received |  |  | 1,700,000 | 500,000 |
Foreign Tax Jurisdiction |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Proceeds from Income Tax Refunds |  |  | $ 0 | $ 0 |

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