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Shareholders' Equity - Narrative (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 07, 2019 | Jul. 02, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 20,000,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.10 |  |  |
Common stock, shares authorized (in shares) |  |  | 100,000,000 | 100,000,000 |  |
Common stock, par value (in dollars per share) |  |  | $ 0.10 | $ 0.1 |  |
Preferred stock, shares issued (in shares) |  |  | 0 | 0 |  |
Preferred stock, shares outstanding (in shares) |  |  | 0 | 0 |  |
Common stock, shares outstanding (in shares) |  |  | 66,665,888 | 64,756,833 |  |
Share-based compensation expense |  |  | $ 25,300,000 | $ 18,600,000 | $ 9,400,000 |
Stock repurchased and retired during period (in shares) |  |  | 0 | 0 | 0 |
Percentage of authorized control Level RBC |  |  | 200.00% |  |  |
Dividends paid |  |  | $ 67,800,000 | $ 56,400,000 | $ 49,500,000 |
Amount available for dividend payment |  |  | 1,300,000,000 |  |  |
Kemper's Insurance Subsidiaries |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Cash dividends paid by Kemper's Insurance Subsidiaries to Kemper |  |  | 239,000,000.0 |  |  |
Amount available for dividend payments |  |  | 435,400,000 |  |  |
Amount of restricted net assets for consolidated and unconsolidated subsidiaries |  |  | 3,900,000,000 |  |  |
Life & Health Insurance | Kemper's Insurance Subsidiaries |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Statutory capital and surplus |  |  | 408,000,000.0 | 454,700,000 |  |
Statutory net income |  |  | 90,400,000 | 143,900,000 | 84,100,000 |
Statutory capital and surplus required |  |  | 122,000,000.0 |  |  |
Property & Casualty Insurance Subsidiaries | Kemper's Insurance Subsidiaries |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Statutory capital and surplus |  |  | 1,600,000,000 | 1,400,000,000 |  |
Statutory net income |  |  | 347,600,000 | $ 236,400,000 | $ 56,900,000 |
Statutory capital and surplus required |  |  | $ 641,900,000 |  |  |
Subordinated Debentures due 2054 (Fair Value: 2018 – $151.1) | Subordinated Debt |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Long-term debt, gross | $ 150,000,000.0 |  |  |  |  |
Stated interest rate, percentage | 7.375% |  | 7.375% |  |  |
Employee Stock Purchase Plan | Stock Options |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Number of exercisable options |  |  |  |  |  | 1,300,000
Minimum annual contributions per employee, percent |  |  | 1.00% |  |  |
Maximum annual contributions per employee, percent |  |  | 10.00% |  |  |
Maximum annual contributions per employee, amount |  |  | $ 25,000 |  |  |
Discount from market price |  |  | 15.00% |  |  |
Shares issued under employee stock purchase plan (in shares) |  |  | 24,080 |  |  |
Price per share (in dollars per share) |  |  | $ 66.08 |  |  |
Share-based compensation expense |  |  | $ 300,000 |  |  |
Investment-grade |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Number of shares issued in transaction (in shares) | 1,552,500 |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 83.00 |  |  |  |  |
Gross proceeds from issuance of common stock | $ 128,900,000 |  |  |  |  |
Transaction costs | 1,700,000 |  |  |  |  |
Net proceeds from issuance of common stock | 127,200,000 |  |  |  |  |
Accrued Liabilities and Other Liabilities | Investment-grade |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Transaction costs | $ 100,000 |  |  |  |  |
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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