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Reporting Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
segment
Mar. 31, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Number of reportable segments 2us-gaap_NumberOfReportableSegments    
Net Sales by Reporting Segment      
Segment Reporting, Entity Consolidated Revenue $ 1,984.2us-gaap_Revenues $ 2,084.1us-gaap_Revenues  
Adjusted earnings before interest, income taxes and noncontrolling interest      
Adjusted EBIT 301.4bwa_AdjustedEbit 312.2bwa_AdjustedEbit  
Restructuring expense 12.1us-gaap_RestructuringCharges 39.5us-gaap_RestructuringCharges  
Gain on previously held equity interest (10.8)us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss    
Corporate, including equity in affiliates' earnings and stock-based compensation 32.0bwa_SegmentReportingCorporateAllocation 30.7bwa_SegmentReportingCorporateAllocation  
Interest income (1.7)us-gaap_InvestmentIncomeInterest (1.5)us-gaap_InvestmentIncomeInterest  
Interest expense and finance charges 10.0us-gaap_InterestAndDebtExpense 8.2us-gaap_InterestAndDebtExpense  
Earnings before income taxes and noncontrolling interest 259.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 235.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments  
Provision for income taxes 72.1us-gaap_IncomeTaxExpenseBenefit 68.1us-gaap_IncomeTaxExpenseBenefit  
Net earnings 187.7us-gaap_ProfitLoss 167.2us-gaap_ProfitLoss  
Net earnings attributable to the noncontrolling interest, net of tax 8.8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 8.1us-gaap_NetIncomeLossAttributableToNoncontrollingInterest  
Net earnings attributable to BorgWarner Inc. 178.9us-gaap_NetIncomeLoss 159.1us-gaap_NetIncomeLoss  
Segment Reporting Information - Assets      
Total assets 7,522.6us-gaap_Assets   7,228.0us-gaap_Assets
Operating Segments [Member]      
Segment Reporting Information - Assets      
Total assets 5,765.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		   5,719.7us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
Engine [Member]      
Net Sales by Reporting Segment      
Segment Reporting, Entity Consolidated Revenue 1,380.9us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_EngineMember		 1,412.1us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_EngineMember		  
Adjusted earnings before interest, income taxes and noncontrolling interest      
Adjusted EBIT 230.4bwa_AdjustedEbit
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_EngineMember		 231.7bwa_AdjustedEbit
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_EngineMember		  
Segment Reporting Information - Assets      
Total assets 3,947.7us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_EngineMember		   3,936.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_EngineMember
Drivetrain [Member]      
Net Sales by Reporting Segment      
Segment Reporting, Entity Consolidated Revenue 611.2us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_DrivetrainMember		 680.7us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_DrivetrainMember		  
Adjusted earnings before interest, income taxes and noncontrolling interest      
Adjusted EBIT 71.0bwa_AdjustedEbit
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_DrivetrainMember		 80.5bwa_AdjustedEbit
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_DrivetrainMember		  
Segment Reporting Information - Assets      
Total assets 1,817.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_DrivetrainMember		   1,783.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= bwa_DrivetrainMember
Intersegment Eliminations [Member]      
Net Sales by Reporting Segment      
Segment Reporting, Entity Consolidated Revenue (7.9)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember		 (8.7)us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember		  
Corporate Segment [Member]      
Segment Reporting Information - Assets      
Total assets 1,757.4us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [1]   1,508.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [1]
BERU Diesel Start Systems Pvt. Ltd. [Member]      
Adjusted earnings before interest, income taxes and noncontrolling interest      
Gain on previously held equity interest $ (10.8)us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member		 $ 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member		  
[1] Corporate assets include investments and other long-term receivables and deferred income taxes.