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Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit) Attributable to Kemper Corporation	$ (17,700,000)	$ 18,800,000	$ (34,500,000)
Effective Income Tax Rate Reconciliation, Percent	(19.00%)	(16.20%)	(19.00%)	(19.40%)
Income Tax (Expense) Benefit	$ (17,500,000)	$ 18,800,000	$ (33,900,000)	$ 42,600,000
Unrecognized tax benefits	$ 0		0		$ 0
Proceeds from Income Tax Refund, Federal			5,600,000	114,600,000
Income Tax Paid, State and Local, after Refund Received			$ 500,000	$ 100,000

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