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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | 51,462,405 | 51,270,940 |
Stock Repurchased and retired during period, Shares | 0 | (100,000) | (1,200,000)
Repurchases of common stock |  | $ (3.8) | $ (43.5)
Company Action Level RBC, as Percentage of Authorized Control Level RBC | 200.00% |  |
Dividends paid | $ 49.5 | 49.2 | 49.7
Amount available for dividend payment | 326.0 |  |
Kemper's Insurance Subsidiaries [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Cash dividends paid by Kemper's Insurance Subsidiaries to Kemper | 108.1 |  |
Amount available for dividend payments | 201.0 |  |
Amount of restricted net assets for consolidated and unconsolidated subsidiaries | 2,400.0 |  |
Life and Health [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Statutory capital and surplus for the Company’s life and health insurance subsidiaries | 414.3 | 403.7 |
Statutory net income for the Company’s life and health insurance subsidiaries | 84.1 | 29.7 | 62.8
Statutory capital and surplus required | 120.9 |  |
Property and Casualty Insurance [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Statutory capital and surplus for the Company’s life and health insurance subsidiaries | 855.3 | 928.9 |
Statutory net income for the Company’s life and health insurance subsidiaries | 56.9 | $ 1.4 | $ 58.9
Statutory capital and surplus required | $ 340.5 |  |
Restricted Stock [Member] |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |
Common stock, shares outstanding | 0 | 16,000 |

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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