v3.25.4
Schedule 2 - Parent Company Financial Statements - Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Statement of Income Captions [Line Items]      
Net Income (Loss) $ 132.6 $ 312.5 $ (272.3)
Reclassification Adjustment for Postretirement Benefit Costs Arising During the Year:      
Change in Discount Rate on Future Life Policyholder Benefits (37.3) 278.0 (101.7)
Other Comprehensive Income Before Income Taxes 124.0 71.3 195.6
Reclassification Adjustment for Postretirement Benefit Costs Arising During the Year:      
Change in Discount Rate on Future Life Policyholder Benefits (7.8) 58.3 (21.2)
Other Comprehensive Income Tax Expense 25.4 15.0 41.5
Other Comprehensive Income, Net of Taxes 98.6 56.3 154.1
Total Comprehensive Income (Loss) 231.2 368.8 (118.2)
Less: Total Comprehensive Loss attributable to Noncontrolling Interest (10.4) (5.3) (0.2)
Comprehensive Income (Loss) attributable to Kemper Corporation 241.6 374.1 (118.0)
Subsidiaries      
Reclassification Adjustment for Securities Having No Credit Losses Included in Net Loss:      
Unrecognized Postretirement Benefit Costs Arising During the Year 0.0 0.5 0.1
Reclassification Adjustment for Postretirement Benefit Costs Arising During the Year:      
Amortization of Accumulated Unrecognized Pension Loss (0.4) (0.3) (0.3)
Unrecognized Gain (Loss) on Cash Flow Hedges Arising During the Year: 1.5 (6.3) 0.0
Reclassification Adjustment for Gain (Loss) on Cash Flow Hedges Arising During the Year: (0.3) 0.0 0.0
Changes in Net Unrealized (Losses) Gains on Investment Securities:      
Reclassification Adjustment for Securities Having No Credit Losses Included in Net Loss: 0.3 1.8 1.0
Unrecognized Postretirement Benefit Costs Arising During the Year: 0.0 0.1 0.0
Reclassification Adjustment for Postretirement Benefit Costs Arising During the Year:      
Subsidiaries (0.1) 0.0 (0.2)
Unrecognized Gain (Loss) on Cash Flow Hedges Arising During the Year: (0.3) (0.9) 0.0
Parent 0.1 0.0 0.0
Subsidiaries | No Credit Losses      
Changes in Net Unrealized Gains (Losses) on Investment Securities:      
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment 160.7 (210.5) 235.0
Reclassification Adjustment for Securities Having No Credit Losses Included in Net Loss:      
Reclassification Adjustment for Amounts Included in Net Income 1.6 8.8 4.5
Changes in Net Unrealized (Losses) Gains on Investment Securities:      
Changes in Net Unrealized (Losses) Gains on Investment Securities: 33.7 (44.2) 49.5
Subsidiaries | Credit Losses      
Changes in Net Unrealized Gains (Losses) on Investment Securities:      
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment 0.3 (0.6) (0.5)
Reclassification Adjustment for Securities Having No Credit Losses Included in Net Loss:      
Reclassification Adjustment for Amounts Included in Net Income 0.0 (0.7) 0.0
Changes in Net Unrealized (Losses) Gains on Investment Securities:      
Changes in Net Unrealized (Losses) Gains on Investment Securities: 0.1 (0.3) (0.2)
Reclassification Adjustment for Securities Having No Credit Losses Included in Net Loss: 0.0 (0.3) 0.0
Parent Company      
Condensed Statement of Income Captions [Line Items]      
Net Income (Loss) 143.3 317.8 (272.3)
Reclassification Adjustment for Securities Having No Credit Losses Included in Net Loss:      
Unrecognized Postretirement Benefit Costs Arising During the Year (0.9) 1.3 (7.4)
Reclassification Adjustment for Postretirement Benefit Costs Arising During the Year:      
Amortization of Accumulated Unrecognized Pension Loss (1.7) (2.8) 66.8
Unrecognized Gain (Loss) on Cash Flow Hedges Arising During the Year: 0.0 0.0 0.0
Reclassification Adjustment for Gain (Loss) on Cash Flow Hedges Arising During the Year: 0.5 (0.9) 0.2
Other Comprehensive Income Before Income Taxes 123.6 71.3 195.6
Changes in Net Unrealized (Losses) Gains on Investment Securities:      
Reclassification Adjustment for Securities Having No Credit Losses Included in Net Loss: 0.0 0.5 (0.1)
Unrecognized Postretirement Benefit Costs Arising During the Year: (0.2) 0.3 (1.3)
Reclassification Adjustment for Postretirement Benefit Costs Arising During the Year:      
Subsidiaries (0.4) (0.6) 14.0
Parent (0.1) 0.2 0.1
Other Comprehensive Income Tax Expense 25.3 15.0 41.5
Other Comprehensive Income, Net of Taxes 98.3 56.3 154.1
Total Comprehensive Income (Loss) 241.6 374.1 (118.2)
Less: Total Comprehensive Loss attributable to Noncontrolling Interest 0.0 0.0 (0.2)
Comprehensive Income (Loss) attributable to Kemper Corporation 241.6 374.1 (118.0)
Parent Company | No Credit Losses      
Changes in Net Unrealized Gains (Losses) on Investment Securities:      
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment 0.0 0.6 (0.6)
Reclassification Adjustment for Securities Having No Credit Losses Included in Net Loss:      
Reclassification Adjustment for Amounts Included in Net Income 0.0 2.4 (0.1)
Changes in Net Unrealized (Losses) Gains on Investment Securities:      
Changes in Net Unrealized (Losses) Gains on Investment Securities: $ 0.0 $ 0.1 $ (0.1)