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Schedule 2 - Parent Company Financial Statements - Narrative (Details)
$ in Millions
12 Months Ended
Mar. 10, 2022
deferral_period
Feb. 23, 2022
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jul. 01, 2022
USD ($)
Condensed Financial Statements, Captions [Line Items]          
Guarantor obligations     $ 40.0 $ 5.0  
Kemper Bermuda Ltd          
Condensed Financial Statements, Captions [Line Items]          
Guarantor obligations         $ 300.0
5.000% Senior Notes Due September 19, 2022 | Senior Notes          
Condensed Financial Statements, Captions [Line Items]          
Redemption price, percentage   100.00%      
Senior Notes, 5.875 Percent Due March 15, 2062 | Junior Debt          
Condensed Financial Statements, Captions [Line Items]          
Stated interest rate, percentage 5.875%        
Interest deferrals, number of deferral periods | deferral_period 1        
Interest deferrals, period (up to) 5 years        
Senior Notes, 5.875 Percent Due March 15, 2062 | Junior Debt | Five-Year Treasury Rate          
Condensed Financial Statements, Captions [Line Items]          
Debt instrument, basis spread on variable rate 4.14%        
Subsidiary of Common Parent | Non-cash Dividends          
Condensed Financial Statements, Captions [Line Items]          
Related party transaction, amounts of transaction     385.6 300.1  
Parent Company | Non-cash Capital Contributions          
Condensed Financial Statements, Captions [Line Items]          
Related party transaction, amounts of transaction     $ 336.5 $ 156.3