Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Net Loss	$ (272.3)	$ (286.6)	[1]	$ (123.7)	[1]
Change in Net Unrecognized Postretirement Benefit Costs	59.2	18.9		(8.8)
(Loss) Gain on Cash Flow Hedges	(0.2)	5.9		0.5
Change in Discount Rate on Future Life Policyholder Benefits	(101.7)	1,380.7		228.5
Other Comprehensive Income (Loss) Before Income Taxes	195.6	(143.7)		(66.3)
Other Comprehensive Income Tax (Expense) Benefit	(41.5)	30.4		14.5
Other Comprehensive Income (Loss), Net of Taxes	154.1	(113.3)		(51.8)
Total Comprehensive Loss	(118.2)	(399.9)		(175.5)
Less: Total Comprehensive Loss attributable to Noncontrolling Interest	(0.2)	0.0		0.0
Comprehensive Loss attributable to Kemper Corporation	(118.0)	(399.9)		(175.5)
No Credit Losses
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities	238.8	(1,551.1)		(284.5)
Credit Losses
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities	$ (0.5)	$ 1.9		$ (2.0)

[1] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been recast to reflect application of the new guidance. See Note 2 to the Consolidated Financial Statements for additional information.