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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings per share | EARNINGS PER SHARE The Company presents both basic and diluted earnings per share of common stock (“EPS”) amounts. Basic EPS is calculated by dividing net earnings attributable to BorgWarner Inc. by the weighted average shares of common stock outstanding during the reporting period. Diluted EPS is calculated by dividing net earnings attributable to BorgWarner Inc. by the weighted average shares of common stock and common equivalent stock outstanding during the reporting period. The dilutive impact of stock-based compensation is calculated using the treasury stock method. The treasury stock method assumes that the Company uses the assumed proceeds from the exercise of awards to repurchase common stock at the average market price during the period. The assumed proceeds under the treasury stock method include the purchase price that the grantee will pay in the future, compensation cost for future service that the Company has not yet recognized. Options are only dilutive when the average market price of the underlying common stock exceeds the exercise price of the options. The dilutive effects of performance-based stock awards described in the Stock Based Compensation footnote are included in the computation of diluted earnings per share at the level the related performance criteria are met through the respective balance sheet date. The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share of common stock:
| Year Ended December 31,
(in millions except per share amounts) | 2017 |  | 2016 |  | 2015
Basic earnings per share: |  |  |  |  |  |  |  |
Net earnings attributable to BorgWarner Inc. | $ | 439.9 |  |  | $ | 595.0 |  |  | $ | 577.2 |
Weighted average shares of common stock outstanding | 210.429 |  |  | 214.374 |  |  | 224.414 |
Basic earnings per share of common stock | $ | 2.09 |  |  | $ | 2.78 |  |  | $ | 2.57 |
Diluted earnings per share: |  |  |  |  |  |  |
Net earnings attributable to BorgWarner Inc. | $ | 439.9 |  |  | $ | 595.0 |  |  | $ | 577.2 |
Weighted average shares of common stock outstanding | 210.429 |  |  | 214.374 |  |  | 224.414 |
Effect of stock-based compensation | 1.119 |  |  | 0.954 |  |  | 1.234 |
Weighted average shares of common stock outstanding including dilutive shares | 211.548 |  |  | 215.328 |  |  | 225.648 |
Diluted earnings per share of common stock | $ | 2.08 |  |  | $ | 2.76 |  |  | $ | 2.56 |

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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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