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Goodwill Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Goodwill [Roll Forward]
Goodwill		$ 1,654.3
Goodwill, Written off Related to Sale of Business Unit		(15.1)
Goodwill, Foreign Currency Translation Gain (Loss)		(9.7)
Goodwill	$ 1,631.7	1,631.7
Driveline [Member]
Goodwill [Roll Forward]
Goodwill		211.1
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Foreign Currency Translation Gain (Loss)		(0.5)
Goodwill	211.9	211.9
Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill		558.9
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Foreign Currency Translation Gain (Loss)		(4.8)
Goodwill	555.0	555.0
Powertrain [Member]
Goodwill [Roll Forward]
Goodwill		478.8
Goodwill, Written off Related to Sale of Business Unit	(15.1)	(15.1)
Goodwill, Foreign Currency Translation Gain (Loss)		(4.4)
Goodwill	459.3	459.3
Casting [Member]
Goodwill [Roll Forward]
Goodwill		405.5
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Foreign Currency Translation Gain (Loss)		0.0
Goodwill	$ 405.5	405.5
Metaldyne Performance Group, Inc. [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0.9
Metaldyne Performance Group, Inc. [Member] | Driveline [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0.0
Metaldyne Performance Group, Inc. [Member] | Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0.9
Metaldyne Performance Group, Inc. [Member] | Powertrain [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0.0
Metaldyne Performance Group, Inc. [Member] | Casting [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0.0
USM Mexico Manufacturing LLC [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		1.3
USM Mexico Manufacturing LLC [Member] | Driveline [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		1.3
USM Mexico Manufacturing LLC [Member] | Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0.0
USM Mexico Manufacturing LLC [Member] | Powertrain [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0.0
USM Mexico Manufacturing LLC [Member] | Casting [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		$ 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
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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ 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

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Amount of divestiture 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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