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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic earnings per share:        
Net earnings attributable to BorgWarner Inc. $ 164.4 $ 148.1 $ 328.5 $ 327.0
Weighted average shares of common stock outstanding 215,735 225,353 216,562 225,575
Basic earnings per share of common stock $ 0.76 $ 0.66 $ 1.52 $ 1.45
Diluted earnings per share:        
Net earnings attributable to BorgWarner Inc. $ 164.4 $ 148.1 $ 328.5 $ 327.0
Weighted average shares of common stock outstanding 215,735 225,353 216,562 225,575
Effect of stock-based compensation 928 1,262 839 1,277
Weighted average shares of common stock outstanding including dilutive shares 216,663 226,615 217,401 226,852
Diluted earnings per share of common stock $ 0.76 $ 0.65 $ 1.51 $ 1.44