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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings per Share reconciliation [Text Block] |
| 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 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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