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NET INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Weighted average common shares outstanding - basic (in shares) 27.5 30.3 28.5 28.4
Weighted average common shares outstanding – diluted (in shares) 27.6 30.5 28.6 28.6
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 11.97 $ 10.18 $ 35.23 $ 27.12
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 11.92 $ 10.11 $ 35.10 $ 26.91
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - basic     $ 1,003.4  
Conversion of Class B common shares into Class A common shares     0.0  
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted $ 329.6 $ 307.9 $ 1,003.4  
Weighted average common shares outstanding - basic (in shares) 27.5 30.3 28.5  
Conversion of Class B common shares into Class A common shares (in shares)     0.0  
Effect of dilutive share-based payment arrangements on weighted average common shares (in shares) 0.1 0.2 0.1  
Weighted average common shares outstanding – diluted (in shares) 27.6 30.5 28.6  
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 11.97 $ 10.18 $ 35.23  
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 11.92 $ 10.11 $ 35.10  
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - basic       $ 768.4
Conversion of Class B common shares into Class A common shares       0.6
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted       $ 769.0
Weighted average common shares outstanding - basic (in shares)       28.4
Conversion of Class B common shares into Class A common shares (in shares)       0.0
Effect of dilutive share-based payment arrangements on weighted average common shares (in shares)       0.2
Weighted average common shares outstanding – diluted (in shares)       28.6
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share)       $ 27.12
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share)       $ 26.91
Class B        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - basic       $ 0.6
Conversion of Class B common shares into Class A common shares       0.0
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted       $ 0.6
Weighted average common shares outstanding - basic (in shares)       0.0
Conversion of Class B common shares into Class A common shares (in shares)       0.0
Effect of dilutive share-based payment arrangements on weighted average common shares (in shares)       0.0
Weighted average common shares outstanding – diluted (in shares)       0.0
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share)       $ 27.12
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share)       $ 26.91