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Net Income (Loss) Per Unrestricted Share (Tables) | 12 Months Ended
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Dec. 31, 2024
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | A reconciliation of the numerator and denominator used in the calculation of Basic Net Income (Loss) Per Unrestricted Share and Diluted Net Income (Loss) Per Unrestricted Share for the years ended December 31, 2024, 2023 and 2022 is presented below.
|  | 2024 |  | 2023 |  | 2022
DOLLARS IN MILLIONS |  |  |  |  |  |
Net Income (Loss) attributable to Kemper Corporation |  | $ | 317.8 |  |  | $ | (272.1) |  |  | $ | (286.6) |
SHARES IN THOUSANDS |  |  |  |  |  |
Weighted-average Unrestricted Shares Outstanding |  | 64,179.5 |  |  | 64,025.6 |  |  | 63,825.5 |
Equity-based Compensation Equivalent Shares |  | 596.5 |  |  | — |  |  | — |
Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution |  | 64,776.0 |  |  | 64,025.6 |  |  | 63,825.5 |
Net Income (Loss) attributable to Kemper Corporation per Unrestricted Share: |  |  |  |  |  |
PER UNRESTRICTED SHARE IN WHOLE DOLLARS |  |  |  |  |  |
Basic Net Income (Loss) Per Unrestricted Share |  | $ | 4.95 |  |  | $ | (4.25) |  |  | $ | (4.50) |
Diluted Net Income (Loss) Per Unrestricted Share |  | $ | 4.91 |  |  | $ | (4.25) |  |  | $ | (4.50) |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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