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Goodwill Rollforward (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 1,141.8
Goodwill, Other Increase (Decrease)	0.0
Goodwill, Foreign Currency Translation Gain (Loss)	(3.5)
Goodwill	1,138.3
Driveline [Member]
Goodwill [Roll Forward]
Goodwill	212.1
Goodwill, Other Increase (Decrease)	187.2
Goodwill, Foreign Currency Translation Gain (Loss)	(0.8)
Goodwill	398.5
Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill	552.4
Goodwill, Other Increase (Decrease)	190.1
Goodwill, Foreign Currency Translation Gain (Loss)	(2.7)
Goodwill	739.8
Powertrain [Member]
Goodwill [Roll Forward]
Goodwill	377.3
Goodwill, Other Increase (Decrease)	(377.3)
Goodwill, Foreign Currency Translation Gain (Loss)	0.0
Goodwill	0.0
Casting [Member]
Goodwill [Roll Forward]
Goodwill	0.0
Goodwill, Other Increase (Decrease)	0.0
Goodwill, Foreign Currency Translation Gain (Loss)	0.0
Goodwill	$ 0.0

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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X

- Definition

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

+ References

No definition available.

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- Definition

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
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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