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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share Reconciliation |
| 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 Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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