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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Capitalization, Equity [Line Items] |  |  |
Preferred Stock, shares authorized | 20,000,000 |  |
Par value of preferred stock (per share) | $ 0.1 |  |
Common stock, shares authorized | 100,000,000 | 100,000,000 |
Par value of common stock (per share) | $ 0.1 | $ 0.1 |
Preferred stock, shares issued | 0 | 0 |
Preferred stock, shares outstanding | 0 | 0 |
Common stock, shares outstanding | 64,756,833 | 51,462,405 |
Stock Repurchased and retired during period, Shares |  |  | (100,000)
Repurchases of common stock |  |  | $ (3.8)
Company Action Level RBC, as Percentage of Authorized Control Level RBC | 200.00% |  |
Dividends paid | $ 56.4 | $ 49.5 | 49.2
Amount available for dividend payment | 911.0 |  |
Kemper's Insurance Subsidiaries [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Cash dividends paid by Kemper's Insurance Subsidiaries to Kemper | 130.4 |  |
Amount available for dividend payments | 351.0 |  |
Amount of restricted net assets for consolidated and unconsolidated subsidiaries | 3,400.0 |  |
Life and Health [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Statutory capital and surplus for the Company’s life and health insurance subsidiaries | 454.7 | 414.3 |
Statutory net income for the Company’s life and health insurance subsidiaries | 143.9 | 84.1 | 29.7
Statutory capital and surplus required | 133.7 |  |
Property and Casualty Insurance [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Statutory capital and surplus for the Company’s life and health insurance subsidiaries | 1,449.6 | 855.3 |
Statutory net income for the Company’s life and health insurance subsidiaries | 236.4 | $ 56.9 | $ 1.4
Statutory capital and surplus required | $ 595.1 |  |

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