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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Weighted average common shares outstanding - basic (in shares) 30.3 22.9 28.4 23.0
Shares used in diluted per share calculations (in shares) 30.5 23.1 28.6 23.2
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 10.18 $ 6.95 $ 27.12 $ 12.30
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 10.11 $ 6.86 $ 26.91 $ 12.18
Class A 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 $ 307.9 $ 156.0 $ 768.4 $ 276.4
Reallocation of net income due to conversion of Class B to Class A common shares outstanding 0.0 0.2 0.0 0.5
Conversion of Class B common shares into Class A common shares 0.0 2.6 0.6 5.8
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted $ 307.9 $ 158.8 $ 769.0 $ 282.7
Weighted average common shares outstanding - basic (in shares) 30.3 22.5 28.4 22.5
Conversion of Class B common shares into Class A common shares (in shares) 0.0 0.4 0.0 0.5
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares) 0.2 0.2 0.2 0.2
Shares used in diluted per share calculations (in shares) 30.5 23.1 28.6 23.2
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 10.18 $ 6.95 $ 27.12 $ 12.29
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 10.11 $ 6.86 $ 26.91 $ 12.18
Class B 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 $ 0.0 $ 2.8 $ 0.6 $ 6.3
Reallocation of net income due to conversion of Class B to Class A common shares outstanding 0.0 0.0 0.0 0.0
Conversion of Class B common shares into Class A common shares 0.0 0.0 0.0 0.0
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted $ 0.0 $ 2.8 $ 0.6 $ 6.3
Weighted average common shares outstanding - basic (in shares) 0.0 0.4 0.0 0.5
Conversion of Class B common shares into Class A common shares (in shares) 0.0 0.0 0.0 0.0
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares) 0.0 0.0 0.0 0.0
Shares used in diluted per share calculations (in shares) 0.0 0.4 0.0 0.5
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 0 $ 6.95 $ 27.12 $ 12.29
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 0 $ 6.86 $ 26.91 $ 12.18