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Proposed Acquisition of Infinity (Details) - USD ($) $ / shares in Units, $ in Billions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Feb. 13, 2018 | Feb. 12, 2018
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Amount included in Mixed Consideration |  | $ 51.60 |
KMPR Shares included in Mixed Consideration |  | 1.2019 |
Cash Amount included in Cash Consideration |  | $ 129.00 |
KMPR Shares included in Stock Consideration |  | 2.0031 |
KMPR Shares held by Infinity Shareholders |  | 20.00% |
20-trading day weighted average price as of 2-12-18 [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Total Merger Value |  | $ 1.4 |
Business Acquisition, Share Price |  | $ 129.00 |
Share Price |  |  | $ 64.40
Kemper's 2-12-18 Closing Price per share [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Total Merger Value |  | $ 1.3 |
Business Acquisition, Share Price |  | $ 121.01 |
Share Price |  |  | $ 57.75
Infinity [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Premiums Written, Net | $ 1.4 |  |

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