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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 2 Months Ended | 10 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 07, 2019 | Jul. 02, 2018 | Apr. 30, 2020 | Mar. 31, 2020 | Apr. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | May 06, 2020
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  | 20,000,000 | 20,000,000 |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  | $ 0.10 | $ 0.10 |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 100,000,000 | 100,000,000 |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  | $ 0.10 | $ 0.10 |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  | 0 | 0 | 0 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  | 0 | 0 | 0 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  | 65,436,207 | 65,436,207 | 66,665,888 |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 24.9 | $ 25.3 | $ 18.6 |  |
Stock repurchased and retired during period (in shares) |  |  |  |  |  |  |  | 0 | 0 |  |
Percentage of authorized control Level RBC |  |  |  |  |  | 200.00% | 200.00% |  |  |  |
Dividends paid |  |  |  |  |  |  | $ 78.9 | $ 67.8 | $ 56.4 |  |
Amount available for dividend payment |  |  |  |  |  | $ 1,500.0 | 1,500.0 |  |  |  |
Stock Repurchase Program, Additional Authorized Amount |  |  |  |  |  |  |  |  |  |  | $ 200.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  | 243.7 |  |  |
Stock Repurchased During Period, Value |  |  |  |  |  |  | $ 110.4 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  | $ 68.29 |  |  |  |
Shareholders' Equity |  |  |  |  |  |  | NOTE 10. SHAREHOLDERS’ EQUITY Common Stock Issuance Kemper is authorized to issue 20 million shares of $0.10 par value preferred stock and 100 million shares of $0.10 par value common stock. No preferred shares were issued or outstanding at December 31, 2020 and 2019. There were 65,436,207 shares and 66,665,888 shares of common stock outstanding at December 31, 2020 and 2019, respectively. On June 7, 2019, the Company completed a public offering of its common stock and issued 1.6 million shares of common stock, at $83.00 per share. Gross proceeds from the offering were $128.9 million. Transaction costs, including the underwriting discount, were $1.7 million. In July 2019, the Company used the net proceeds of $127.2 million from the offering, together with a portion of the proceeds from the 2023 Term Loan (see Note 8, “Debt”) to redeem all $150.0 million in aggregate outstanding principal of its 7.375% Subordinated Debentures due 2054. In conjunction with the closing of the Infinity acquisition, Kemper issued 13,184,107 shares of common stock on July 2, 2018, at $74.53 per share. See Note 3, “Acquisition of Business,” to the Consolidated Financial Statements for additional information. Common Stock Repurchases On May 6, 2020, Kemper’s Board of Directors authorized the repurchase of up to an additional $200.0 million of Kemper common stock, in addition to the $243.7 million remaining under the previous authorization as of December 31, 2019. As of December 31, 2020, the remaining share repurchase authorization was $333.3 million under the repurchase program. During the year ended December 31, 2020, Kemper repurchased and retired 1.6 million shares of its common stock in open market transactions under its share repurchase authorization for an aggregate cost of $110.4 million and average cost per share of $68.29. Shares purchased during 2020 were as follows:
|  |  |  |  |  | Total |  | Maximum
|  |  |  |  |  | Number of Shares |  | Dollar Value of Shares
|  |  |  | Average |  | Purchased as Part |  | that May Yet Be
|  | Total |  | Price |  | of Publicly |  | Purchased Under
|  | Number of Shares |  | Paid per |  | Announced Plans |  | the Plans or Programs
Period |  | Purchased |  | Share |  | or Programs |  | (Dollars in Millions)
March 1 - 31, 2020 |  | 1,488,668 |  |  | $ | 67.98 |  |  | 1,488,668 |  |  | $ | 142.5 |
April 1 - 30, 2020 |  | 128,019 |  |  | $ | 71.85 |  |  | 1,616,687 |  |  | $ | 133.3 |
Total |  | 1,616,687 |  |  | $ | 68.29 |  |  | 1,616,687 |  |  | $ | 333.3 |
NOTE 10. SHAREHOLDERS’ EQUITY (Continued) Kemper did not repurchase any of its common stock in open market transactions in 2019 or 2018. Employee Stock Purchase Plan During the second quarter of 2019, the Company’s stockholders approved the adoption of the Kemper Employee Stock Purchase Plan (“ESPP”) and the reservation of 1.3 million shares for issuance under the ESPP. Under the ESPP, the Company issued 60,703 shares under the plan in 2020 at an average discounted price of $61.57 per share and 24,080 shares under the plan in 2019 at an average discounted price of 66.08 per share. Compensation costs charged against income were $0.7 million and $0.3 million for the years ended December 31, 2020 and 2019, respectively. Dividends Various state insurance laws restrict the amount that an insurance subsidiary may pay in the form of dividends, loans or advances without the prior approval of regulatory authorities. Also, that portion of an insurance subsidiary’s net equity which results from differences between statutory insurance accounting practices and GAAP would not be available for cash dividends, loans or advances. Kemper’s insurance subsidiaries paid dividends of $322.0 million to Kemper in 2020. In 2021, Kemper’s insurance subsidiaries would be able to pay $402.8 million in dividends to Kemper without prior regulatory approval. Kemper’s insurance subsidiaries had net assets of $4.4 billion, determined in accordance with GAAP, that were restricted from payment to Kemper without prior regulatory approval at December 31, 2020. Kemper’s insurance subsidiaries are required to file financial statements prepared on the basis of statutory insurance accounting practices, a comprehensive basis of accounting other than GAAP. Statutory capital and surplus for the Company’s life and health insurance subsidiaries was $430.4 million and $408.0 million at December 31, 2020 and 2019, respectively. Statutory net income for the Company’s life and health insurance subsidiaries was $60.7 million, $90.4 million and $143.9 million for the years ended December 31, 2020, 2019 and 2018, respectively. Statutory capital and surplus for the Company’s property and casualty insurance subsidiaries was $1.7 billion and $1.6 billion at December 31, 2020 and 2019, respectively. Statutory net income for the Company’s property and casualty insurance subsidiaries was $361.6 million, $347.6 million and $236.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. Statutory capital and surplus and statutory net income exclude parent company operations. Kemper’s insurance subsidiaries are also required to hold minimum levels of statutory capital and surplus to satisfy regulatory requirements. The minimum statutory capital and surplus, or company action level risk-based capital (“RBC”), necessary to satisfy regulatory requirements for the Company’s life and health insurance subsidiaries collectively was $158.1 million at December 31, 2020. The minimum statutory capital and surplus necessary to satisfy regulatory requirements for the Company’s property and casualty insurance subsidiaries collectively was $586.6 million at December 31, 2020. Company action level RBC is the level at which a company is required to file a corrective action plan with its regulators and is equal to 200% of the authorized control level RBC. In 2020, Kemper paid dividends of $78.9 million to its shareholders. Except for certain financial covenants under Kemper’s credit agreement or during any period in which Kemper elects to defer interest payments, there are no restrictions on Kemper’s ability to pay dividends to its shareholders. Certain financial covenants, namely minimum net worth and a maximum debt to total capitalization ratio, under Kemper’s credit agreement could limit the amount of dividends that Kemper may pay to shareholders at December 31, 2020. Kemper had the ability to pay without restrictions $1.5 billion in dividends to its shareholders and still be in compliance with all financial covenants under its credit agreement at December 31, 2020. |  |  |  |
Payments of Ordinary Dividends, Common Stock |  |  |  |  |  |  | $ 78.9 |  |  |  |
Property and Casualty Insurance |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory capital and surplus |  |  |  |  |  | 1,700.0 | 1,700.0 | 1,600.0 |  |  |
Statutory net income |  |  |  |  |  |  | 361.6 | 347.6 | 236.4 |  |
Statutory capital and surplus required |  |  |  |  |  | 586.6 | 586.6 |  |  |  |
Life & Health Insurance |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory net income |  |  |  |  |  |  | 60.7 | 90.4 | $ 143.9 |  |
Statutory capital and surplus required |  |  |  |  |  | 158.1 | 158.1 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 133.3 | $ 142.5 | $ 133.3 | $ 333.3 | $ 333.3 |  |  |  |
Stock Repurchased During Period, Shares |  |  | 128,019 | 1,488,668 | 1,616,687 | 1,616,687 | 1,600,000 |  |  |  |
Stock Repurchased During Period, Value |  |  |  |  |  |  | $ 0.2 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 71.85 | $ 67.98 |  |  | $ 68.29 |  |  |  |
Kemper's Insurance Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid by Kemper's Insurance Subsidiaries to Kemper |  |  |  |  |  |  | $ 322.0 |  |  |  |
Amount available for dividend payments |  |  |  |  |  | $ 402.8 | 402.8 |  |  |  |
Amount of restricted net assets for consolidated and unconsolidated subsidiaries |  |  |  |  |  | 4,400.0 | 4,400.0 |  |  |  |
Life & Health Insurance |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory capital and surplus |  |  |  |  |  | $ 430.4 | $ 430.4 | $ 408.0 |  |  |
Subordinated Debentures due 2054 (Fair Value: 2018 – $151.1) | Subordinated Debt |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross | $ 150.0 |  |  |  |  |  |  |  |  |  |
Stated interest rate, percentage | 7.375% |  |  |  |  |  |  |  |  |  |
Employee Stock Purchase Plan | Stock Options |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of exercisable options |  |  |  |  |  |  |  |  |  | 1,300,000 |
Shares issued under employee stock purchase plan (in shares) |  |  |  |  |  |  | 60,703 | 24,080 |  |  |
Price per share (in dollars per share) |  |  |  |  |  | $ 61.57 | $ 61.57 | $ 66.08 |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 0.7 | $ 0.3 |  |  |
Investment-grade |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | 1,600,000 |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 83.00 |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 128.9 |  |  |  |  |  |  |  |  |  |
Transaction costs | 1.7 |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock | $ 127.2 |  |  |  |  |  |  |  |  |  |
Infinity Property and Casualty Corporation |  |  |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, interest issued (in shares) |  | 13,184,107 |  |  |  |  |  |  |  |  |
Share price |  | $ 74.53 |  |  |  |  |  |  |  |  |

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