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Subsequent Event- Acquisition of Infinity (Details)
12 Months Ended
Jul. 02, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
employees
agent
Jun. 30, 2018
USD ($)
Jun. 29, 2018
USD ($)
Business Combination, Separately Recognized Transactions [Line Items]        
Long-term Debt, Gross   $ 592,300,000 $ 841,800,000  
Infinity [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Business Acquisition, Number of Employees | employees   2,300    
Business Combination, Number of Agents | agent   10,600    
Premiums Written, Net   $ 1,400,000,000    
Subsequent Event [Member] | Infinity [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 13,184,107      
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable $ 982,600,000      
Payments to Acquire Businesses, Gross 564,600,000.0      
Subsequent Event [Member] | Infinity [Member] | Kemper's 2-12-18 Closing Price per share [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Total Merger Value $ 1,600,000,000      
Share Price | $ / shares $ 74.53      
Secured Debt [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Long-term Debt, Gross   $ 0 249,400,000  
Secured Debt [Member] | Infinity [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Long-term Debt, Gross       $ 250,000,000
Subsidiaries [Member] | Infinity [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Accumulated Amortization, Debt Issuance Costs     $ 110,000,000