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Recent Transactions (Details)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Feb. 28, 2014
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
USD ($)
Dec. 31, 2014
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
USD ($)
Dec. 31, 2014
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
EUR (€)
Dec. 31, 2012
BERU Korea [Member]
USD ($)
Dec. 31, 2012
Spark Plug Business [Member]
USD ($)
Feb. 28, 2014
Know-how [Member]
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
USD ($)
Feb. 28, 2014
Patented Technology [Member]
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
USD ($)
Feb. 28, 2014
Customer Relationships [Member]
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
USD ($)
Feb. 28, 2014
Trade Names [Member]
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
USD ($)
Dec. 31, 2014
Minimum [Member]
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
Dec. 31, 2014
Maximum [Member]
Gustav Wahler GmbH u. Co. KG and General Partner [Member]
Business Acquisition [Line Items]                            
Ownership after transaction 100.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction                          
Business acquisition, percentage of voting interests acquired       100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Payments for businesses acquired, net of cash acquired $ 110.5us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired   $ 110.5us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
€ 80.1us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Liabilities assumed from business acquired 3.2us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 0us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 0us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 3.2us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Debt assumed from business acquired 40.3us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 0us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 0us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 40.3us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables       52.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       46.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment       55.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Goodwill 1,205.7us-gaap_Goodwill 1,197.0us-gaap_Goodwill   76.9us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       42.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
        10.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bwa_KnowhowMember
4.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
24.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
3.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets and Liabilities       (49.7)bwa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsandLiabilities
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable       (70.4)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net       154.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Liabilities assumed from businesses acquired       3.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt       40.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life                         5 years 15 years
Business Acquisition, Goodwill, Nondeductible Amount       56.9bwa_BusinessAcquisitionGoodwillNondeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
                   
Goodwill, Purchase Accounting Adjustments 29.6us-gaap_GoodwillPurchaseAccountingAdjustments                          
Ownership percentage of noncontrolling owners             49.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= bwa_BeruKoreaMember
             
Purchase of noncontrolling interest     15.0us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates       15.0us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_BusinessAcquisitionAxis
= bwa_BeruKoreaMember
             
Purchase of subsidiary shares from noncontrolling interest             7.0us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_BusinessAcquisitionAxis
= bwa_BeruKoreaMember
             
Adjustments to capital in excess of par value             8.0us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
/ us-gaap_BusinessAcquisitionAxis
= bwa_BeruKoreaMember
             
Ownership percentage of parent             100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= bwa_BeruKoreaMember
             
Loss from disposal activities     39.7us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal                      
Proceeds from sale of business               $ 55.2us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
/ us-gaap_BusinessAcquisitionAxis
= bwa_SparkPlugBusinessMember