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Statutory Information and Dividend Limitations - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jul. 01, 2022
Statutory Accounting Practices [Line Items]
Guarantor obligations	$ 40.0
Cash Dividends from Subsidiaries	448.9	$ 213.3	$ 640.9
Dividend payments without regulatory approval	8.6
Kemper Bermuda Ltd
Statutory Accounting Practices [Line Items]
Guarantor obligations				$ 300.0
Dividends paid	55.0	0.0	$ 0.0
Subsidiaries
Statutory Accounting Practices [Line Items]
Amount of restricted net assets for consolidated and unconsolidated subsidiaries	3,500.0	3,200.0
Subsidiaries \| Life and Health Companies
Statutory Accounting Practices [Line Items]
Statutory capital and surplus required	26.4	31.6
Subsidiaries \| Property and Casualty Companies
Statutory Accounting Practices [Line Items]
Statutory capital and surplus required	$ 684.9	$ 574.9