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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Reconciliation
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in millions, except per share amounts)
2018
 
2017
 
2018
 
2017
Basic earnings per share:
 
 
 
 
 
 
 
Net earnings attributable to BorgWarner Inc.
$
203.8

 
$
184.9

 
$
700.7

 
$
586.1

Weighted average shares of common stock outstanding
207.471

 
209.803

 
208.505

 
210.657

Basic earnings per share of common stock
$
0.98

 
$
0.88

 
$
3.36

 
$
2.78

 
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
Net earnings attributable to BorgWarner Inc.
$
203.8

 
$
184.9

 
$
700.7

 
$
586.1

 
 
 
 
 
 
 
 
Weighted average shares of common stock outstanding
207.471


209.803


208.505


210.657

Effect of stock-based compensation
1.267

 
1.210

 
1.282

 
0.918

Weighted average shares of common stock outstanding including dilutive shares
208.738


211.013


209.787


211.575

Diluted earnings per share of common stock
$
0.98


$
0.88


$
3.34


$
2.77