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Net (Loss) Income Per Unrestricted Share - Reconciliation of Numerator and Denominator Used in Calculation (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net (Loss) Income attributable to Kemper Corporation $ (21.0) $ 73.7 $ 151.3 $ 220.4
Weighted-Average Unrestricted Shares Outstanding (in shares) 61,477,400 64,216,500 63,092,200 64,288,400
Equity-based Compensation Equivalent Shares (in shares) 0 681,500 628,200 575,400
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution (in shares) 61,477,400 64,898,000 63,720,400 64,863,800
Basic Net (Loss) Income Per Unrestricted Share (in shares) $ (0.34) $ 1.15 $ 2.40 $ 3.43
Diluted Net (Loss) Income Per Unrestricted Share (in shares) $ (0.34) $ 1.14 $ 2.37 $ 3.40