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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net income attributable to Lithia Motors, Inc. $ 209.5 $ 162.6
Weighted average common shares outstanding - basic (in shares) 26.3 27.5
Effect of employee stock purchases and restricted stock units on weighted average common shares outstanding (in shares) 0.1 0.1
Weighted average common shares outstanding – diluted (in shares) 26.4 27.6
Basic EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share) $ 7.96 $ 5.90
Diluted EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share) $ 7.94 $ 5.89