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Retirement related obligations

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Segment reporting corporate allocation, including equity in affiliates' arnings and stock-based compensation.

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Tax benefit associated with restructuring

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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- Definition

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The loss recognized on termination of a contract.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reporting Segments and Related Information - Adjusted EBIT (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Adjusted EBIT									$ 1,227.3bwa_AdjustedEbit	$ 1,078.2bwa_AdjustedEbit	$ 995.5bwa_AdjustedEbit
Restructuring expense	17.8us-gaap_RestructuringCharges	9.6us-gaap_RestructuringCharges	13.0us-gaap_RestructuringCharges	38.4us-gaap_RestructuringCharges	35.8us-gaap_RestructuringCharges				90.8us-gaap_RestructuringCharges	39.8us-gaap_RestructuringCharges	27.4us-gaap_RestructuringCharges
Intangible asset impairment					12.5				10.3	12.5
Pension settlement									3.1
Program termination agreement										11.3us-gaap_LossOnContractTermination
Retirement related obligations										5.9bwa_RetirementRelatedObligations	17.3bwa_RetirementRelatedObligations
Loss from disposal activities											39.7
Corporate, including equity in affiliates' earnings and stock-based compensation									112.1bwa_SegmentReportingCorporateAllocation	110.0bwa_SegmentReportingCorporateAllocation	115.4bwa_SegmentReportingCorporateAllocation
Interest income	(1.2)us-gaap_InvestmentIncomeInterest	(1.4)us-gaap_InvestmentIncomeInterest	(1.4)us-gaap_InvestmentIncomeInterest	(1.5)us-gaap_InvestmentIncomeInterest	(1.5)us-gaap_InvestmentIncomeInterest	(1.3)us-gaap_InvestmentIncomeInterest	(1.0)us-gaap_InvestmentIncomeInterest	(1.0)us-gaap_InvestmentIncomeInterest	(5.5)us-gaap_InvestmentIncomeInterest	(4.8)us-gaap_InvestmentIncomeInterest	(4.7)us-gaap_InvestmentIncomeInterest
Interest expense and finance charges	10.2us-gaap_InterestAndDebtExpense	9.0us-gaap_InterestAndDebtExpense	9.0us-gaap_InterestAndDebtExpense	8.2us-gaap_InterestAndDebtExpense	7.6us-gaap_InterestAndDebtExpense	8.1us-gaap_InterestAndDebtExpense	8.8us-gaap_InterestAndDebtExpense	9.7us-gaap_InterestAndDebtExpense	36.4us-gaap_InterestAndDebtExpense	34.2us-gaap_InterestAndDebtExpense	39.4us-gaap_InterestAndDebtExpense
Earnings before income taxes and noncontrolling interest									980.1	869.3	761.0
Provision for income taxes	67.3us-gaap_IncomeTaxExpenseBenefit	71.9us-gaap_IncomeTaxExpenseBenefit	85.3us-gaap_IncomeTaxExpenseBenefit	68.1us-gaap_IncomeTaxExpenseBenefit	44.5us-gaap_IncomeTaxExpenseBenefit	56.3us-gaap_IncomeTaxExpenseBenefit	66.6us-gaap_IncomeTaxExpenseBenefit	50.9us-gaap_IncomeTaxExpenseBenefit	292.6us-gaap_IncomeTaxExpenseBenefit	218.3us-gaap_IncomeTaxExpenseBenefit	238.6us-gaap_IncomeTaxExpenseBenefit
Net earnings	147.4us-gaap_ProfitLoss	173.0us-gaap_ProfitLoss	199.9us-gaap_ProfitLoss	167.2us-gaap_ProfitLoss	149.4us-gaap_ProfitLoss	172.9us-gaap_ProfitLoss	180.1us-gaap_ProfitLoss	148.6us-gaap_ProfitLoss	687.5us-gaap_ProfitLoss	651.0us-gaap_ProfitLoss	522.4us-gaap_ProfitLoss
Net earnings attributable to the noncontrolling interest, net of tax	7.5	6.4	9.7	8.1	8.0	6.1	6.0	6.6	31.7	26.7	21.5
Net earnings attributable to BorgWarner Inc.	139.9us-gaap_NetIncomeLoss	166.6us-gaap_NetIncomeLoss	190.2us-gaap_NetIncomeLoss	159.1us-gaap_NetIncomeLoss	141.4us-gaap_NetIncomeLoss	166.8us-gaap_NetIncomeLoss	174.1us-gaap_NetIncomeLoss	142.0us-gaap_NetIncomeLoss	655.8us-gaap_NetIncomeLoss	624.3us-gaap_NetIncomeLoss	500.9us-gaap_NetIncomeLoss
Tax benefit associated with restructuring	3.4	1.4	1.7	8.8					15.3	5.1	7.7
Pension settlement loss											5.7
Engine [Member]
Segment Reporting Information [Line Items]
Adjusted EBIT									924.0	826.0	786.4
Drivetrain [Member]
Segment Reporting Information [Line Items]
Adjusted EBIT									303.3	252.2	209.1
U.S. Plans:
Segment Reporting Information [Line Items]
Pension settlement											5.7
Pension settlement loss	$ 0.4	$ 2.7							$ 3.1	$ 0	$ 0