Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Earned Premiums (Changes in Deferred Profit Liability for the Three Months Ended: 2024 - $16.4; 2023 - $15.9 and Nine Months Ended: 2024 - $52.8; 2023 - $51.6)	$ 1,068.5	$ 1,117.8	$ 3,134.1	$ 3,465.6
Net Investment Income	111.1	107.0	304.5	315.1
Change in Value of Alternative Energy Partnership Investments	0.5	0.8	1.5	2.3
Other Income	2.2	2.4	6.4	5.3
Change in Fair Value of Equity and Convertible Securities	(2.3)	2.8	(0.1)	6.9
Net Realized Investment Gains (Losses)	1.1	(30.3)	9.2	(38.3)
Impairment Losses	(2.2)	(1.1)	(3.8)	0.1
Total Revenues	1,178.9	1,199.4	3,451.8	3,757.0
Expenses:
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses (Changes in Liability for Future Policyholder Benefits for the Three Months Ended: 2024 - $0.3; 2023 - $6.1 and Nine Months Ended: 2024 - $7.9; 2023 - $8.6)	769.3	975.2	2,269.7	3,011.9
Insurance Expenses	254.3	259.0	739.3	794.4
Interest and Other Expenses	64.6	156.0	173.6	311.7
Goodwill Impairment	0.0	0.0	0.0	49.6
Total Expenses	1,088.2	1,390.2	3,182.6	4,167.6
Income (Loss) before Income Taxes	90.7	(190.8)	269.2	(410.6)
Income Tax (Expense) Benefit	(18.5)	44.4	(52.4)	87.0
Net Income (Loss)	72.2	(146.4)	216.8	(323.6)
Less: Net Loss attributable to Noncontrolling Interest	(1.5)	(0.1)	(3.6)	(0.1)
Net Income (Loss) attributable to Kemper Corporation	$ 73.7	$ (146.3)	$ 220.4	$ (323.5)
Net Income (Loss) attributable to Kemper Corporation per Unrestricted Share:
Basic (in dollars per share)	$ 1.15	$ (2.28)	$ 3.43	$ (5.05)
Diluted (in dollars per share)	$ 1.14	$ (2.28)	$ 3.40	$ (5.05)