Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 164.1	$ 178.9
Weighted average shares of common stock outstanding	217,388	225,796
Basic earnings per share of common stock	$ 0.75	$ 0.79
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 164.1	$ 178.9
Weighted average shares of common stock outstanding	217,388	225,796
Effect of stock-based compensation	749	1,292
Weighted average shares of common stock outstanding including dilutive shares	218,137	227,088
Diluted earnings per share of common stock	$ 0.75	$ 0.79

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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