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Earnings Per Share | 12 Months Ended
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Dec. 31, 2015
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 and any windfall/(shortfall) tax benefits that would be credited/(debited) to capital in excess of par value when the award generates a tax deduction. Options are only dilutive when the average market price of the underlying common stock exceeds the exercise price of the options. 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) | 2015 |  | 2014 |  | 2013
Basic earnings per share: |  |  |  |  |  |  |  |
Net earnings attributable to BorgWarner Inc. | $ | 609.7 |  |  | $ | 655.8 |  |  | $ | 624.3 |
Weighted average shares of common stock outstanding | 224.414 |  |  | 227.150 |  |  | 228.600 |
Basic earnings per share of common stock | $ | 2.72 |  |  | $ | 2.89 |  |  | $ | 2.73 |
Diluted earnings per share: |  |  |  |  |  |  |
Net earnings attributable to BorgWarner Inc. | $ | 609.7 |  |  | $ | 655.8 |  |  | $ | 624.3 |
Weighted average shares of common stock outstanding | 224.414 |  |  | 227.150 |  |  | 228.600 |
Effect of stock-based compensation | 1.234 |  |  | 1.774 |  |  | 2.737 |
Weighted average shares of common stock outstanding including dilutive shares | 225.648 |  |  | 228.924 |  |  | 231.337 |
Diluted earnings per share of common stock | $ | 2.70 |  |  | $ | 2.86 |  |  | $ | 2.70 |

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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 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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