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Reporting Segments (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 2    
Net Sales by Reporting Segment      
Sales Revenue, Goods, Net $ 2,784.3 $ 2,407.0  
Adjusted earnings before interest, income taxes and noncontrolling interest      
Adjusted EBIT 401.2 350.6  
Restructuring expense 7.5 0.0  
Merger and acquisition expense 2.2 0.0  
Lease termination settlement 0.0 5.3  
Other expense, net (4.8) 0.0  
Other postretirement income (2.6) (1.2)  
Corporate, including equity in affiliates' earnings and stock-based compensation 52.6 44.1  
Interest income (1.5) (1.5)  
Interest expense and finance charges 16.1 18.0  
Earnings before income taxes and noncontrolling interest 331.7 285.9  
Provision for income taxes 94.9 86.3  
Net earnings 236.8 199.6  
Net earnings attributable to the noncontrolling interest, net of tax 11.7 10.4  
Net earnings attributable to BorgWarner Inc. 225.1 189.2  
Segment Reporting Information - Assets      
Total assets 10,034.8   $ 9,789.6
Operating Segments [Member]      
Segment Reporting Information - Assets      
Total assets 8,944.2   8,638.7
Engine [Member]      
Net Sales by Reporting Segment      
Sales Revenue, Goods, Net 1,716.1 1,495.4  
Adjusted earnings before interest, income taxes and noncontrolling interest      
Adjusted EBIT 280.2 246.2  
Segment Reporting Information - Assets      
Total assets 4,919.1   4,733.4
Drivetrain [Member]      
Net Sales by Reporting Segment      
Sales Revenue, Goods, Net 1,082.9 924.9  
Adjusted earnings before interest, income taxes and noncontrolling interest      
Adjusted EBIT 121.0 104.4  
Segment Reporting Information - Assets      
Total assets 4,025.1   3,905.3
Intersegment Eliminations [Member]      
Net Sales by Reporting Segment      
Sales Revenue, Goods, Net (14.7) $ (13.3)  
Corporate, Non-Segment [Member]      
Segment Reporting Information - Assets      
Total assets [1] $ 1,090.6   $ 1,150.9
[1] Corporate assets include investments and other long-term receivables and certain deferred income taxes.