v3.26.1
Cover Page - shares
 6 Months Ended
Jun. 30, 2026
Aug. 03, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-18298  
Entity Registrant Name Kemper Corporation  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 95-4255452  
Entity Address, Address Line One 200 E. Randolph Street  
Entity Address, Address Line Two Suite 3300  
Entity Address, City or Town Chicago  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60601  
City Area Code 312  
Local Phone Number 661-4600  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   58,923,154
Central Index Key 0000860748  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Common Stock, par value $0.10 per share    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.10 per share  
Trading Symbol KMPR  
Security Exchange Name NYSE  
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062    
Document Information [Line Items]    
Title of 12(b) Security 5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062  
Trading Symbol KMPB  
Security Exchange Name NYSE