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Acquisition of Business (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 13, 2018 USD ($) | Jul. 02, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) 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 |  | $ 982.5 |  |
Payments to Acquire Businesses, Gross |  | 564.6 |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Fair Value of the Restricted Units Granted |  | 3.3 |  |
Business Combination, Consideration Transferred, Other |  | 1.6 |  |
Business Combination, Contingent Consideration, Liability, Noncurrent |  | 1.7 |  |
Business Combination, Consideration Transferred, Liabilities Incurred | $ 110.0 |  |  |
Business Combination, Number of Agents | agent |  |  |  | 10,600
Premiums Written, Net |  |  |  | $ 1,400.0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Legal Accruals, Other LIabilities and Tax Related Balance |  |  | $ 22.9 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  |  | 1.7 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill |  |  | $ 21.2 |
Kemper's 2-12-18 Closing Price per share [Member] | Infinity [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total Merger Value |  | $ 1,500.0 |  |
Share Price | $ / shares |  | $ 74.53 |  |
Secured Debt [Member] | Infinity [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  | $ 250.0 |  |

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