Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning balance	$ 1,654.3	$ 154.0
Goodwill, Impairment Loss	(485.5)	0.0	$ 0.0
Goodwill, Written off Related to Sale of Business Unit	(15.1)
Goodwill, Translation and Purchase Accounting Adjustments	(14.1)	27.5
Ending balance	1,141.8	1,654.3	154.0
Driveline [Member]
Goodwill [Roll Forward]
Beginning balance	211.1	130.1
Goodwill, Impairment Loss	0.0
Goodwill, Written off Related to Sale of Business Unit	0.0
Goodwill, Translation and Purchase Accounting Adjustments	(0.3)	0.6
Ending balance	212.1	211.1	130.1
Metal Forming [Member]
Goodwill [Roll Forward]
Beginning balance	558.9	23.9
Goodwill, Impairment Loss	0.0
Goodwill, Written off Related to Sale of Business Unit	0.0
Goodwill, Translation and Purchase Accounting Adjustments	(7.4)	19.7
Ending balance	552.4	558.9	23.9
Powertrain [Member]
Goodwill [Roll Forward]
Beginning balance	478.8	0.0
Goodwill, Impairment Loss	(80.0)
Goodwill, Written off Related to Sale of Business Unit	(15.1)
Goodwill, Translation and Purchase Accounting Adjustments	(6.4)	7.2
Ending balance	377.3	478.8	0.0
Casting [Member]
Goodwill [Roll Forward]
Beginning balance	405.5	0.0
Goodwill, Impairment Loss	(405.5)
Goodwill, Written off Related to Sale of Business Unit	0.0
Goodwill, Translation and Purchase Accounting Adjustments	0.0	0.0
Ending balance	0.0	405.5	$ 0.0
Metaldyne Performance Group, Inc. [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.9	1,392.4
Metaldyne Performance Group, Inc. [Member] \| Driveline [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0	0.0
Metaldyne Performance Group, Inc. [Member] \| Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.9	515.3
Metaldyne Performance Group, Inc. [Member] \| Powertrain [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0	471.6
Metaldyne Performance Group, Inc. [Member] \| Casting [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0	405.5
USM Mexico Manufacturing LLC [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	1.3	80.4
USM Mexico Manufacturing LLC [Member] \| Driveline [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	1.3	80.4
USM Mexico Manufacturing LLC [Member] \| Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0	0.0
USM Mexico Manufacturing LLC [Member] \| Powertrain [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0	0.0
USM Mexico Manufacturing LLC [Member] \| Casting [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	$ 0.0	$ 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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