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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | 11. EARNINGS PER SHARE Basic earnings per share (“EPS”) is determined by dividing net income attributable to common shareholders by the weighted average number of common shares and DSUs outstanding during the period. Diluted EPS is computed by dividing net income attributable to common shareholders by the weighted average number of common shares and DSUs outstanding during the period, adjusted for the exercise and/or conversion of all po tentially dilutive securities. Such dilutive items include Company contributions to the sen ior management stock option plan, convertible debentures and shares issued under the dividend reinvestment plan.
The following table reconciles the computation of basic and diluted earnings per share:
For the |  | Year ended December 31
millions of Canadian dollars (except per share amounts) |  | 2017 |  | 2016
Numerator |  |  |  |
Net income attributable to common shareholders | $ | 266.1 | $ | 227.2
Convertible Debentures |  | - |  | 0.2
Diluted numerator |  | 266.1 |  | 227.4
Denominator |  |  |  |
Weighted average shares of common stock outstanding |  | 212.3 |  | 170.4
Weighted average deferred share units outstanding |  | 1.1 |  | 1.0
Weighted average shares of common stock outstanding – basic |  | 213.4 |  | 171.4
Stock-based compensation |  | 0.6 |  | 0.6
Convertible Debentures |  | 0.1 |  | 0.2
Weighted average shares of common stock outstanding – diluted |  | 214.1 |  | 172.2
Earnings per common share |  |  |  |
Basic | $ | 1.25 | $ | 1.33
Diluted | $ | 1.24 | $ | 1.32

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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