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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