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Balance Sheet Information - Equity Method Investment (Details) (NSK Warner [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Nov. 30, 2014
Dec. 31, 2013
Nov. 30, 2013
Dec. 31, 2012
Nov. 30, 2012
NSK Warner [Member]
           
Schedule of Equity Method Investments [Line Items]            
Equity investment in NSK Warner, percent 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
         
Joint Venture Partner Interest In Subsidiary 40.00%bwa_JointVenturePartnerInterestInSubsidiary
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
         
Equity Method Investment, Dividends or Distributions $ 45.1us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  $ 31.0us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  $ 28.1us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
 
Equity Method Investment, Summarized Financial Information [Abstract]            
Cash and securities   65.6bwa_EquityMethodInvestmentSummarizedFinancialInformationCashAndSecurities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  118.3bwa_EquityMethodInvestmentSummarizedFinancialInformationCashAndSecurities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
   
Current assets, including cash and securities   237.2us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  313.6us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
   
Non-current assets   144.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  156.1us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
   
Current liabilities   128.1us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  166.8us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
   
Non-current liabilities   37.7us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  40.7us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
   
Total equity   215.7us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  262.2us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
   
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]            
Net sales   546.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  604.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  696.7us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
Gross profit   124.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  126.6us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  138.2us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
Net earnings   80.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  68.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  68.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
Purchases from Equity Method Investee $ 21.3us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  $ 22.8us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember
  $ 22.8us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bwa_NskWarnerMember