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Shareholders' Equity - Narrative (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 07, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | May 06, 2020 | Aug. 06, 2014
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 | $ 0.10 |  |  |
Common stock, shares outstanding (in shares) |  | 63,684,628 | 65,436,207 |  |  |
Stock Repurchase Program, Additional Authorized Amount |  |  |  |  | $ 200,000,000 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 171,600,000 | $ 333,300,000 |  |  | $ 133,000,000
Stock repurchased and retired during period (in shares) |  | 2,085,000 | 1,617,000 |  |  |
Stock Repurchased and Retired During Period, Value |  | $ 161,700,000 | $ 110,400,000 |  |  |
Share-based compensation expense |  | $ 28,000,000 | 24,900,000 | $ 25,300,000 |  |
Percentage of authorized control Level RBC |  | 200.00% |  |  |  |
Dividends paid |  | $ 80,600,000 | $ 78,900,000 | 67,800,000 |  |
Amount available for dividend payment |  | $ 1,200,000,000 |  |  |  |
Common Stock |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Average cost per share (in dollars per share) |  | $ 77.58 | $ 68.29 |  |  |
Kemper's Insurance Subsidiaries |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Cash dividends paid by Kemper's Insurance Subsidiaries to Kemper |  | $ 347,000,000 |  |  |  |
Amount available for dividend payments |  | 191,200,000 |  |  |  |
Amount of restricted net assets for consolidated and unconsolidated subsidiaries |  | 4,500,000,000 |  |  |  |
Life & Health Insurance | Kemper's Insurance Subsidiaries |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Statutory capital and surplus |  | 446,000,000 | $ 430,400,000 |  |  |
Statutory net income |  | (12,400,000) | 60,700,000 | 90,400,000 |  |
Statutory capital and surplus required |  | 157,700,000 |  |  |  |
Property & Casualty Insurance Subsidiaries | Kemper's Insurance Subsidiaries |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Statutory capital and surplus |  | 1,500,000,000 | 1,700,000,000 |  |  |
Statutory net income |  | (206,900,000) | $ 361,600,000 | $ 347,600,000 |  |
Statutory capital and surplus required |  | $ 668,200,000 |  |  |  |
Subordinated Debentures due 2054 (Fair Value: 2018 – $151.1) | Subordinated Debt |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Long-term debt, gross | $ 150,000,000 |  |  |  |  |
Stated interest rate, percentage | 7.375% |  |  |  |  |
Employee Stock Purchase Plan | Employee Stock |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |
Shares issued under employee stock purchase plan (in shares) |  | 79,000 | 61,000 | 24,000 |  |
Price per share (in dollars per share) |  | $ 58.08 | $ 61.57 | $ 66.08 |  |
Share-based compensation expense |  | $ 800,000 | $ 700,000 | $ 300,000 |  |
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 | $ 128,900,000 |  |  |  |  |
Transaction costs | 1,700,000 |  |  |  |  |
Net proceeds from issuance of common stock | $ 127,200,000 |  |  |  |  |

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Data Type: | na
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