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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders $ 214.2 $ 297.2 $ 376.7 $ 525.9
Weighted average common shares outstanding - basic (in shares) 27.2 27.5 27.4 27.5
Effect of employee stock purchases and restricted stock units on weighted average common shares outstanding (in shares) 0.0 0.1 0.0 0.1
Weighted average common shares outstanding – diluted (in shares) 27.2 27.6 27.4 27.6
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 7.88 $ 10.79 $ 13.77 $ 19.11
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 7.87 $ 10.78 $ 13.75 $ 19.08