Goodwill Rollforward (Details) $ in Millions	9 Months Ended
Sep. 30, 2019 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 1,141.8
Reorganization	0.0
Foreign currency translation	(14.3)
Goodwill	1,127.5
Driveline [Member]
Goodwill [Roll Forward]
Goodwill	212.1
Reorganization	187.2
Foreign currency translation	(5.4)
Goodwill	393.9
Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill	552.4
Reorganization	190.1
Foreign currency translation	(8.9)
Goodwill	733.6
Powertrain [Member]
Goodwill [Roll Forward]
Goodwill	377.3
Reorganization	(377.3)
Foreign currency translation	0.0
Goodwill	0.0
Casting [Member]
Goodwill [Roll Forward]
Goodwill	0.0
Reorganization	0.0
Foreign currency translation	0.0
Goodwill	$ 0.0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB
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- Definition

Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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