Earnings Per Share (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 190.2	$ 174.1	$ 349.3	$ 316.1
Weighted average shares of common stock outstanding	227,678	229,496	227,554	229,934
Basic earnings per share of common stock	$ 0.84	$ 0.76	$ 1.54	$ 1.37
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 190.2	$ 174.1	$ 349.3	$ 316.1
Weighted average shares of common stock outstanding	227,678	229,496	227,554	229,934
Effect of stock-based compensation	1,992	2,706	1,945	2,732
Weighted average shares of common stock outstanding including dilutive shares	229,670	232,202	229,499	232,666
Diluted earnings per share of common stock	$ 0.83	$ 0.75	$ 1.52	$ 1.36