Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income (Loss)	$ 312.5	$ (272.3)	$ (286.6)
Change in Unrecognized Postretirement Benefit Costs	(1.3)	59.2	18.9
(Loss) Gain on Cash Flow Hedges	(5.4)	(0.2)	5.9
Change in Discount Rate on Future Life Policyholder Benefits	278.0	(101.7)	1,380.7
Other Comprehensive Income (Loss) Before Income Taxes	71.3	195.6	(143.7)
Other Comprehensive Income Tax Expense (Benefit)	15.0	41.5	(30.4)
Other Comprehensive Income (Loss), Net of Taxes	56.3	154.1	(113.3)
Total Comprehensive Income (Loss)	368.8	(118.2)	(399.9)
Less: Net Loss attributable to Noncontrolling Interest	(5.3)	(0.2)	0.0
Less: Other Comprehensive Income attributable to Noncontrolling Interest	0.0	0.0	0.0
Less: Total Comprehensive Loss attributable to Noncontrolling Interest	(5.3)	(0.2)	0.0
Comprehensive Income (Loss) attributable to Kemper Corporation	374.1	(118.0)	(399.9)
No Credit Losses
Changes in Unrealized (Losses) Gains on Investment Securities with:	(198.7)	238.8	(1,551.1)
Credit Losses
Changes in Unrealized (Losses) Gains on Investment Securities with:	$ (1.3)	$ (0.5)	$ 1.9