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Goodwill Rollforward (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 1,654.3
Goodwill, Written off Related to Sale of Business Unit	(15.1)
Goodwill, Foreign Currency Translation Gain (Loss)	(8.4)
Goodwill	1,633.0
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)	(0.3)
Goodwill	212.1
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)	(5.6)
Goodwill	554.2
Powertrain [Member]
Goodwill [Roll Forward]
Goodwill	478.8
Goodwill, Written off Related to Sale of Business Unit	(15.1)
Goodwill, Foreign Currency Translation Gain (Loss)	(2.5)
Goodwill	461.2
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
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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-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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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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-Paragraph 1
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+ 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
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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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