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Earnings Per Share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The Company presents both basic and diluted earnings per share of common stock (“EPS”). 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 and compensation cost for future service that the Company has not yet recognized. 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 total shareholder return performance shares of 174,400 shares granted in 2016 and 174,750 shares granted in 2018 were excluded from the computation of the diluted earnings per share for the three and six months ended June 30, 2018 because the impact of these potential shares would be anti-dilutive to the basic earnings per share. The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share of common stock:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions, except per share amounts) | 2018 |  | 2017 |  | 2018 |  | 2017
Basic earnings per share: |  |  |  |  |  |  |
Net earnings attributable to BorgWarner Inc. | $ | 271.8 |  |  | $ | 212.0 |  |  | $ | 496.9 |  |  | $ | 401.2 |
Weighted average shares of common stock outstanding | 208.570 |  |  | 210.572 |  |  | 209.023 |  |  | 211.084 |
Basic earnings per share of common stock | $ | 1.30 |  |  | $ | 1.01 |  |  | $ | 2.38 |  |  | $ | 1.90 |
Diluted earnings per share: |  |  |  |  |  |  |
Net earnings attributable to BorgWarner Inc. | $ | 271.8 |  |  | $ | 212.0 |  |  | $ | 496.9 |  |  | $ | 401.2 |
Weighted average shares of common stock outstanding | 208.570 |  |  | 210.572 |  |  | 209.023 |  |  | 211.084 |
Effect of stock-based compensation | 1.287 |  |  | 0.906 |  |  | 1.289 |  |  | 0.773 |
Weighted average shares of common stock outstanding including dilutive shares | 209.857 |  |  | 211.478 |  |  | 210.312 |  |  | 211.857 |
Diluted earnings per share of common stock | $ | 1.30 |  |  | $ | 1.00 |  |  | $ | 2.36 |  |  | $ | 1.89 |

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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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