Subsequent Events (Notes)	12 Months Ended
Dec. 31, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	NOTE 26. SUBSEQUENT EVENTS On February 13, 2018, Kemper, Kemper Merger Sub and Infinity entered into the Infinity Merger Agreement under which Kemper will acquire Infinity in a cash and stock transaction valued at approximately $1.4 billion, plus assumption of certain of Infinity’s debt, or $129.00 per Infinity share; the exchange ratio for stock consideration to be issued in the merger is fixed and was determined based on Kemper’s 20-trading day volume weighted average price as of February 12, 2018 of $64.40. Based on Kemper’s February 12, 2018 closing stock price of $57.75, the implied total consideration is approximately $1.3 billion, or $121.01 per Infinity share. Pursuant to the Infinity Merger Agreement, Kemper Merger Sub will merge with and into Infinity, with Infinity surviving as a wholly owned subsidiary of Kemper. Infinity is a national provider of auto insurance focused on serving the specialty, nonstandard segment. With approximately 2,300 employees, 10,600 independent agents and $1.4 billion in 2017 direct written premiums, Infinity is one of the largest nonstandard auto insurers in the United States. Under the terms of the Infinity Merger Agreement, as of the effective time of the Infinity Merger (the “Effective Time”), each share of Infinity common stock issued and outstanding as of immediately prior to the Effective Time (other than as set forth in the Infinity Merger Agreement) will be canceled and converted into, at the election of the holder of such share, the right to, receive(i) $51.60 in cash and 1.2019 Kemper common shares for each share of Infinity common stock, without interest (the “Mixed Consideration”), (ii) an amount of cash for each share of Infinity common stock, without interest, equal to $129.00 (the “Cash Consideration”) or (iii) a number of shares of Kemper common stock equal to 2.0031 (the “Stock Consideration”). Holders of Infinity common stock who do not make an election will receive the Mixed Consideration. The consideration to be paid to holders of Infinity common stock electing to receive the Cash Consideration or the Stock Consideration in connection with the Infinity Merger is subject to automatic adjustment, as applicable, to ensure that the total amount of cash paid and the total number of shares of Kemper common stock issued in the Infinity Merger is the same as what would be paid and issued if all holders of Infinity common stock were to receive the Mixed Consideration. Following the close of the Infinity Merger, Infinity shareholders are expected to own approximately 20% of the combined company on a pro-forma basis. The Infinity Merger has been approved by the Board of Directors of each company and is expected to close in the third quarter of 2018, subject to the satisfaction or waiver of applicable closing conditions. Such closing conditions to which the completion of the Infinity Merger is subject include, among others, (i) adoption by Infinity shareholders of the Infinity Merger Agreement, (ii) approval by Kemper stockholders of the issuance of Kemper common stock in connection with the Infinity Merger, (iii) the expiration or termination of any applicable waiting period (or extensions thereof) under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 and the receipt of certain other regulatory approvals, (iv) the absence of any effective order issued by any court of competent jurisdiction or other legal restraint prohibiting or preventing the consummation of the Infinity Merger and (v) other closing conditions.

NOTE 26. SUBSEQUENT EVENTS

On February 13, 2018, Kemper, Kemper Merger Sub and Infinity entered into the Infinity Merger Agreement under which Kemper will acquire Infinity in a cash and stock transaction valued at approximately $1.4 billion, plus assumption of certain of Infinity’s debt, or $129.00 per Infinity share; the exchange ratio for stock consideration to be issued in the merger is fixed and was determined based on Kemper’s 20-trading day volume weighted average price as of February 12, 2018 of $64.40. Based on Kemper’s February 12, 2018 closing stock price of $57.75, the implied total consideration is approximately $1.3 billion, or $121.01 per Infinity share. Pursuant to the Infinity Merger Agreement, Kemper Merger Sub will merge with and into Infinity, with Infinity surviving as a wholly owned subsidiary of Kemper. Infinity is a national provider of auto insurance focused on serving the specialty, nonstandard segment. With approximately 2,300 employees, 10,600 independent agents and $1.4 billion in 2017 direct written premiums, Infinity is one of the largest nonstandard auto insurers in the United States.

Under the terms of the Infinity Merger Agreement, as of the effective time of the Infinity Merger (the “Effective Time”), each share of Infinity common stock issued and outstanding as of immediately prior to the Effective Time (other than as set forth in the Infinity Merger Agreement) will be canceled and converted into, at the election of the holder of such share, the right to, receive(i) $51.60 in cash and 1.2019 Kemper common shares for each share of Infinity common stock, without interest (the “Mixed Consideration”), (ii) an amount of cash for each share of Infinity common stock, without interest, equal to $129.00 (the “Cash Consideration”) or (iii) a number of shares of Kemper common stock equal to 2.0031 (the “Stock Consideration”). Holders of Infinity common stock who do not make an election will receive the Mixed Consideration. The consideration to be paid to holders of Infinity common stock electing to receive the Cash Consideration or the Stock Consideration in connection with the Infinity Merger is subject to automatic adjustment, as applicable, to ensure that the total amount of cash paid and the total number of shares of Kemper common stock issued in the Infinity Merger is the same as what would be paid and issued if all holders of Infinity common stock were to receive the Mixed Consideration. Following the close of the Infinity Merger, Infinity shareholders are expected to own approximately 20% of the combined company on a pro-forma basis.

The Infinity Merger has been approved by the Board of Directors of each company and is expected to close in the third quarter of 2018, subject to the satisfaction or waiver of applicable closing conditions. Such closing conditions to which the completion of the Infinity Merger is subject include, among others, (i) adoption by Infinity shareholders of the Infinity Merger Agreement, (ii) approval by Kemper stockholders of the issuance of Kemper common stock in connection with the Infinity Merger, (iii) the expiration or termination of any applicable waiting period (or extensions thereof) under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 and the receipt of certain other regulatory approvals, (iv) the absence of any effective order issued by any court of competent jurisdiction or other legal restraint prohibiting or preventing the consummation of the Infinity Merger and (v) other closing conditions.