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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share Reconciliation |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions, except per share amounts) | 2018 |  | 2017 |  | 2018 |  | 2017
Basic earnings per share: |  |  |  |  |  |  |
Net earnings attributable to BorgWarner Inc. | $ | 203.8 |  |  | $ | 184.9 |  |  | $ | 700.7 |  |  | $ | 586.1 |
Weighted average shares of common stock outstanding | 207.471 |  |  | 209.803 |  |  | 208.505 |  |  | 210.657 |
Basic earnings per share of common stock | $ | 0.98 |  |  | $ | 0.88 |  |  | $ | 3.36 |  |  | $ | 2.78 |
Diluted earnings per share: |  |  |  |  |  |  |
Net earnings attributable to BorgWarner Inc. | $ | 203.8 |  |  | $ | 184.9 |  |  | $ | 700.7 |  |  | $ | 586.1 |
Weighted average shares of common stock outstanding | 207.471 |  |  | 209.803 |  |  | 208.505 |  |  | 210.657 |
Effect of stock-based compensation | 1.267 |  |  | 1.210 |  |  | 1.282 |  |  | 0.918 |
Weighted average shares of common stock outstanding including dilutive shares | 208.738 |  |  | 211.013 |  |  | 209.787 |  |  | 211.575 |
Diluted earnings per share of common stock | $ | 0.98 |  |  | $ | 0.88 |  |  | $ | 3.34 |  |  | $ | 2.77 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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