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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings per Share reconciliation [Text Block]
 
Year Ended December 31,
(in millions except share and per share amounts)
2018
 
2017
 
2016
Basic earnings per share:
 

 
 

 
 

Net earnings attributable to BorgWarner Inc.
$
930.7

 
$
439.9

 
$
595.0

Weighted average shares of common stock outstanding
208.197

 
210.429

 
214.374

Basic earnings per share of common stock
$
4.47

 
$
2.09

 
$
2.78

 
 
 
 
 
 
Diluted earnings per share:
 
 
 

 
 

Net earnings attributable to BorgWarner Inc.
$
930.7

 
$
439.9

 
$
595.0

 
 
 
 
 
 
Weighted average shares of common stock outstanding
208.197

 
210.429

 
214.374

Effect of stock-based compensation
1.299

 
1.119

 
0.954

Weighted average shares of common stock outstanding including dilutive shares
209.496

 
211.548

 
215.328

Diluted earnings per share of common stock
$
4.44

 
$
2.08

 
$
2.76

 
 
 
 
 
 
Antidilutive stock-based awards excluded from the calculation of diluted earnings per share
0.139

 
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