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Recent Transactions (Details)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2014
USD ($)
Jan. 29, 2015
BERU Diesel Start Systems Pvt. Ltd. [Member]
USD ($)
Jan. 29, 2015
BERU Diesel Start Systems Pvt. Ltd. [Member]
INR
Mar. 31, 2015
BERU Diesel Start Systems Pvt. Ltd. [Member]
USD ($)
Mar. 31, 2014
BERU Diesel Start Systems Pvt. Ltd. [Member]
USD ($)
Feb. 28, 2014
Wahler
USD ($)
Dec. 31, 2014
Wahler
USD ($)
Dec. 31, 2014
Wahler
EUR (€)
Feb. 28, 2014
Wahler
Customer Relationships [Member]
USD ($)
Feb. 28, 2014
Wahler
Know-how [Member]
USD ($)
Feb. 28, 2014
Wahler
Patented technology [Member]
USD ($)
Feb. 28, 2014
Trade Names [Member]
Wahler
USD ($)
Feb. 28, 2014
Minimum [Member]
Wahler
Feb. 28, 2014
Maximum [Member]
Wahler
Business Acquisition [Line Items]                                
Equity interest acquired       51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
    100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Equity interest acquired, step acquisition       100.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
100.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
                     
Liabilities assumed from business acquired $ 0us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 $ 3.2us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1           $ 3.2us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Debt assumed from business acquired 0us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 33.3us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1           40.3us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Aggregated estimated fair value of assets acquired and liabilities assumed                                
Receivables, net               52.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Inventories, net               46.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Property, plant and equipment, net               55.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Goodwill 1,168.6us-gaap_Goodwill   1,205.7us-gaap_Goodwill         74.6us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Other intangible assets, net of tax               42.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
    24.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
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
3.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
   
Other assets and liabilities               (47.4)bwa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsandLiabilities
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Accounts payable and accrued expenses               (70.4)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Total consideration, net of cash acquired               154.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Less: Assumed retirement-related liabilities               3.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Less: Assumed debt               40.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
               
Cash paid, net of cash acquired 12.6us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 106.4us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired   12.6us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
783.1us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
      110.5us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
80.1us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember
           
Gain on previously held equity interest 10.8us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss         10.8us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
                 
Assets acquired       16.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
                       
Definite-lived intangible assets       11.2us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
                       
Assumed liabilities       4.6us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
                       
Weighted average useful life                             5 years 15 years
Nondeductible amount of goodwill       $ 13.9bwa_BusinessAcquisitionGoodwillNondeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= bwa_BERUDieselStartSystemsPvt.Ltd.Member
      $ 56.9bwa_BusinessAcquisitionGoodwillNondeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= bwa_GustavWahlerGmbHu.Co.KGandGeneralPartnerMember