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Net (Loss) Income Per Unrestricted Share (Tables) | 9 Months Ended
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Sep. 30, 2025
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 (Loss) Income Per Unrestricted Share and Diluted Net (Loss) Income Per Unrestricted Share for the three and nine months ended September 30, 2025 and 2024 is presented below.
|  | Three Months Ended |  | Nine Months Ended
(Dollars in Millions, except per share amounts) |  | Sep 30, 2025 |  | Sep 30, 2024 |  | Sep 30, 2025 |  | Sep 30, 2024
Net (Loss) Income attributable to Kemper Corporation |  | $ | (21.0) |  |  | $ | 73.7 |  |  | $ | 151.3 |  |  | $ | 220.4 |
Shares in Thousands |  |  |  |  |  |  |  |
Weighted-average Unrestricted Shares Outstanding |  | 61,477.4 |  |  | 64,216.5 |  |  | 63,092.2 |  |  | 64,288.4 |
Equity-based Compensation Equivalent Shares |  | — |  |  | 681.5 |  |  | 628.2 |  |  | 575.4 |
Weighted-average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution |  | 61,477.4 |  |  | 64,898.0 |  |  | 63,720.4 |  |  | 64,863.8 |
Net (Loss) Income attributable to Kemper Corporation per Unrestricted Share: |  |  |  |  |  |  |  |
(Per Unrestricted Share in Whole Dollars) |  |  |  |  |  |  |  |
Basic Net (Loss) Income Per Unrestricted Share |  | $ | (0.34) |  |  | $ | 1.15 |  |  | $ | 2.40 |  |  | $ | 3.43 |
Diluted Net (Loss) Income Per Unrestricted Share |  | $ | (0.34) |  |  | $ | 1.14 |  |  | $ | 2.37 |  |  | $ | 3.40 |

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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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