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Earnings Per Share	12 Months Ended
Earnings Per Share	Dec. 31, 2022
12. Earnings Per Share
Earnings Per Share	12. EARNINGS PER SHARE Basic earnings per share is determined by dividing net income attributable to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income attributable to common shareholders by the weighted average number of common shares outstanding during the period, adjusted for the exercise and/or conversion of all potentially dilutive securities. Such dilutive items include Company contributions to the senior management stock option plan, convertible debentures and shares issued under the DRIP. The following table reconciles the computation of basic and diluted earnings per share: For the Year ended December 31 millions of dollars (except per share amounts) 2022 2021 Numerator Net income attributable to common shareholders $ 945.1 $ 510.5 Diluted numerator 945.1 510.5 Denominator Weighted average shares of common stock outstanding 265.5 255.9 Weighted average deferred share units outstanding (1) - 1.3 Weighted average shares of common stock outstanding – basic 265.5 257.2 Stock-based compensation 0.4 0.4 Weighted average shares of common stock outstanding – diluted 265.9 257.6 Earnings per common share Basic $ 3.56 $ 1.98 Diluted $ 3.55 $ 1.98 (1) Effective February 10, 2022, deferred share units are no longer able to be settled in shares and are therefore no longer included in the calculation of earnings per common share.