Property, Plant and Equipment, net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Capital Expenditures Incurred but Not yet Paid	$ 38.4		$ 58.4
Capitalized interest costs	3.8us-gaap_InterestCostsCapitalized	3.5us-gaap_InterestCostsCapitalized
Property Plant and Equipment
Total property, plant and equipment, gross	2,969.5us-gaap_PropertyPlantAndEquipmentGross		3,043.9us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation	(1,046.5)		(1,076.8)
Property, plant and equipment, net, excluding tooling	1,923.0		1,967.1
Tooling, net of amortization	126.9bwa_ToolingNetOfAmortization		126.8bwa_ToolingNetOfAmortization
Property, plant and equipment, net	2,049.9us-gaap_PropertyPlantAndEquipmentNet		2,093.9us-gaap_PropertyPlantAndEquipmentNet
Land, land use rights and buildings [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	754.8		784.8
Machinery and equipment [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	1,863.3		1,940.3
Capital leases [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	8.8		8.4
Construction in progress [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	$ 342.6		$ 310.4

Property, plant and equipment - net of accumulated depreciation.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of interest capitalized during the period.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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