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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to Lithia Motors, Inc. $ 217.1 $ 207.3 $ 682.7 $ 584.0
Weighted average common shares outstanding - basic (in shares) 25.2 26.7 25.8 27.2
Effect of employee stock purchases and restricted stock units on weighted average common shares outstanding (in shares) 0.0 0.1 0.0 0.0
Weighted average common shares outstanding – diluted (in shares) 25.2 26.8 25.8 27.2
Basic EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share) $ 8.63 $ 7.75 $ 26.47 $ 21.50
Diluted EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share) $ 8.61 $ 7.73 $ 26.42 $ 21.47