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Business Segments - Segment Net Operating Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Segment Net Operating Income (Loss) $ 91.7 $ (14.2) $ 161.4 $ (69.9)
Less: Net Loss attributable to Noncontrolling Interest (1.0) 0.0 (2.1) 0.0
Debt Extinguishment, Pension Settlement and Other Charges 2.7 0.0 2.7 0.0
Goodwill Impairment Charge 0.0 (49.6) 0.0 (49.6)
Net Income (Loss) attributable to Kemper Corporation 75.4 (97.1) 146.7 (177.2)
Operating Segments        
Segment Reporting Information [Line Items]        
Segment Net Operating Income (Loss) 102.1 (1.9) 183.2 (47.1)
Operating Segments | Specialty Property & Casualty Insurance        
Segment Reporting Information [Line Items]        
Segment Net Operating Income (Loss) 102.3 (10.8) 171.5 (69.2)
Operating Segments | Non-Core Operations        
Segment Reporting Information [Line Items]        
Segment Net Operating Income (Loss) (13.4) (2.7) (8.4) (12.2)
Operating Segments | Life Insurance        
Segment Reporting Information [Line Items]        
Segment Net Operating Income (Loss) (0.2) 8.9 11.7 22.1
Corporate and Other        
Segment Reporting Information [Line Items]        
Segment Net Operating Income (Loss) (11.4) (12.3) (23.9) (22.8)
Segment Reconciling Items        
Segment Reporting Information [Line Items]        
Change in Fair Value of Equity and Convertible Securities (1.0) 1.9 1.7 3.2
Net Realized Investment Gains (Losses) 1.2 (12.5) 6.4 (7.4)
Impairment Losses (0.1) (0.8) (1.3) 0.9
Acquisition and Disposition Related Transaction, Integration, Restructuring and Other Costs (5.1) (23.3) (15.2) (46.3)
Debt Extinguishment, Pension Settlement and Other Charges 2.1 0.0 2.1 0.0
Goodwill Impairment Charge $ 0.0 $ (45.5) $ 0.0 $ (45.5)