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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic earnings per share:    
Net earnings attributable to BorgWarner Inc. $ 225.1 $ 189.2
Weighted average shares of common stock outstanding 209,475,000 211,596,000
Basic earnings per share of common stock $ 1.07 $ 0.89
Diluted earnings per share:    
Net earnings attributable to BorgWarner Inc. $ 225.1 $ 189.2
Weighted average shares of common stock outstanding 209,475,000 211,596,000
Effect of stock-based compensation 1,291,000 640,000
Weighted average shares of common stock outstanding including dilutive shares 210,766,000 212,236,000
Diluted earnings per share of common stock $ 1.07 $ 0.89
Performance Shares [Member]    
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Antidilutive securities excluded from computation of earnings per share amount 174,400