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Document and Entity Information Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 15, 2024
Jun. 30, 2023
Dec. 31, 2022
Cover [Abstract]        
Document type 10-K      
Document annual report true      
Document period end date Dec. 31, 2023      
Document transition report false      
Commission file number 001-34568      
Entity registrant name OPENLANE, Inc.      
Entity incorporation state DE      
Entity tax identification number 20-8744739      
Entity address, address line one 11299 N. Illinois Street      
Entity address, city Carmel      
Entity address, state IN      
Entity address, postal zip code 46032      
City area code 800      
Local phone number 923-3725      
Title of 12(b) security Common Stock, par value $0.01 per share      
Trading symbol KAR      
Security exchange name NYSE      
Well-known seasoned issuer Yes      
Entity voluntary filers No      
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      
ICFR auditor attestation flag true      
Entity shell company false      
Entity public float     $ 1,639,190,438  
Entity common stock, shares outstanding   108,045,559    
Common stock, par value (in dollars per share) $ 0.01     $ 0.01
Current fiscal year end date --12-31      
Entity central index key 0001395942      
Document fiscal year focus 2023      
Document fiscal period focus FY      
Amendment flag false      
Document Financial Statement Error Correction [Flag] false