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Acquisition of Business (Narrative) (Details) |  | 12 Months Ended
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Jul. 02, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) agent
Business Acquisition [Line Items] |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 44,010 |
Infinity [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 13,184,107 |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Fair Value of the Restricted Units Granted | $ 3,300,000 |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 982,500,000 |
Business Combination, Consideration Transferred, Other | 1,600,000 |
Contingent Consideration Classified as Equity, Fair Value Disclosure | 1,700,000 |
Payments to Acquire Businesses, Gross | 564,600,000.0 |
Business Combination, Consideration Transferred, Liabilities Incurred | 110,000,000 |
Business Combination, Number of Agents | agent |  | 10,600
Premiums Written, Net |  | $ 1,400,000,000
Kemper's 2-12-18 Closing Price per share [Member] | Infinity [Member] |  |
Business Acquisition [Line Items] |  |
Total Merger Value | $ 1,500,000,000 |
Share Price | $ / shares | $ 74.53 |
Secured Debt [Member] | Infinity [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Consideration Transferred, Liabilities Incurred | $ 250,000,000 |

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