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Subsequent Event- Acquisition of Infinity (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 02, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) employees agent | Jun. 30, 2018 USD ($) | Jun. 29, 2018 USD ($)
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 592,300,000 | $ 841,800,000 |
Infinity [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Business Acquisition, Number of Employees | employees |  | 2,300 |  |
Business Combination, Number of Agents | agent |  | 10,600 |  |
Premiums Written, Net |  | $ 1,400,000,000 |  |
Subsequent Event [Member] | Infinity [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [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 | $ 982,600,000 |  |  |
Payments to Acquire Businesses, Gross | 564,600,000.0 |  |  |
Subsequent Event [Member] | Infinity [Member] | Kemper's 2-12-18 Closing Price per share [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Total Merger Value | $ 1,600,000,000 |  |  |
Share Price | $ / shares | $ 74.53 |  |  |
Secured Debt [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 0 | 249,400,000 |
Secured Debt [Member] | Infinity [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Long-term Debt, Gross |  |  |  | $ 250,000,000
Subsidiaries [Member] | Infinity [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Accumulated Amortization, Debt Issuance Costs |  |  | $ 110,000,000 |

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