v3.26.1
Business Segments - Segment Net Operating Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Total Revenues $ 1,092.7 $ 1,225.6 $ 2,199.9 $ 2,418.6
Total Expenses (1,559.7) (1,138.1) (2,674.8) (2,211.3)
Less: Net Loss attributable to Noncontrolling Interest (1.2) (2.8) (3.9) (5.5)
Goodwill Impairment 460.0 0.0 460.0 0.0
Net (Loss) Income attributable to Kemper Corporation (464.8) 72.6 (466.5) 172.3
Operating Segments        
Segment Reporting [Line Items]        
Total Revenues 1,104.0 1,208.6 2,197.0 2,371.4
Net operating income (loss) 34.1 91.6 52.2 206.7
Operating Segments | Specialty Property & Casualty Insurance        
Segment Reporting [Line Items]        
Total Revenues 951.6 1,063.1 1,894.8 2,077.1
Total Expenses (935.8) (984.1) (1,878.9) (1,900.2)
Net operating income (loss) 15.8 79.0 15.9 176.9
Operating Segments | Life Insurance        
Segment Reporting [Line Items]        
Total Revenues 152.4 145.5 302.2 294.3
Total Expenses (134.1) (132.9) (265.9) (264.5)
Net operating income (loss) 18.3 12.6 36.3 29.8
Corporate and Other        
Segment Reporting [Line Items]        
Net operating income (loss) (9.0) (10.3) (17.3) (21.7)
Non-Core Operations        
Segment Reporting [Line Items]        
Total Revenues 14.4 21.3 29.8 49.2
Change in Fair Value of Equity and Convertible Securities (1.4) (0.4) (2.4) (0.3)
Net Realized Investment Gains (Losses) 0.5 (0.1) 0.8 0.6
Impairment Losses (18.8) (2.8) (20.1) (2.6)
Acquisition and Disposition Related Transaction, Integration, Restructuring and Other Costs (11.6) (3.8) (16.6) (8.0)
Debt Extinguishment and Other Charges 0.0 0.0 0.0 0.4
Goodwill Impairment (460.0) 0.0 (460.0) 0.0
Net (Loss) Income attributable to Kemper Corporation $ 0.2 $ (4.4) $ (7.0) $ (8.3)