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Earnings Per Share
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Earnings Per Share EARNINGS PER SHARE
We calculate basic earnings per share (EPS) by dividing net income attributable to Lithia Motors, Inc. by the weighted average number of common shares outstanding for the period, including vested RSU awards. Diluted EPS is calculated by dividing net income attributable to Lithia Motors, Inc. by the weighted average number of shares outstanding, adjusted for the dilutive effect of unvested RSU awards and employee stock purchases.

The following is a reconciliation of net income attributable to Lithia Motors, Inc. and weighted average shares used for our basic EPS and diluted EPS:
Year Ended December 31,
($ in millions, except for per share amounts)
202320222021
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders$1,000.8 $1,251.0 $1,060.1 
Weighted average common shares outstanding – basic27.5 28.2 28.8 
Effect of employee stock purchases and restricted stock units on weighted average common shares0.1 0.1 0.2 
Weighted average common shares outstanding – diluted 27.6 28.3 29.0 
Basic earnings per share attributable to Lithia Motors, Inc.$36.36 $44.38 $36.81 
Diluted earnings per share attributable to Lithia Motors, Inc.$36.29 $44.17 $36.54 

The effects of antidilutive securities on common stock was evaluated for the years ended 2023, 2022, and 2021 and determined to be immaterial.