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Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning balance		$ 1,141.8	$ 1,654.3
Impairment charge		(440.0)	(485.5)
Sale of business			(15.1)
Foreign currency translation		(2.7)	(14.1)
Reorganization		0.0
Ending balance	$ 699.1	699.1	1,141.8
Goodwill, Impaired, Accumulated Impairment Loss	925.5	925.5
Driveline [Member]
Goodwill [Roll Forward]
Beginning balance		212.1	211.1
Impairment charge		0.0	0.0
Sale of business			0.0
Foreign currency translation		(1.0)	(0.3)
Reorganization		187.2
Ending balance	398.3	398.3	212.1
Metal Forming [Member]
Goodwill [Roll Forward]
Beginning balance		552.4	558.9
Impairment charge	(440.0)	(440.0)	0.0
Sale of business			0.0
Foreign currency translation		(1.7)	(7.4)
Reorganization		190.1
Ending balance	300.8	300.8	552.4
Powertrain [Member]
Goodwill [Roll Forward]
Beginning balance		377.3	478.8
Impairment charge		0.0	(80.0)
Sale of business			(15.1)
Foreign currency translation		0.0	(6.4)
Reorganization		(377.3)
Ending balance	0.0	0.0	377.3
Casting [Member]
Goodwill [Roll Forward]
Beginning balance		0.0	405.5
Impairment charge		0.0	(405.5)
Sale of business			0.0
Foreign currency translation		0.0	0.0
Reorganization		0.0
Ending balance	$ 0.0	$ 0.0	0.0
Metaldyne Performance Group, Inc. [Member]
Goodwill [Roll Forward]
Goodwill acquired			0.9
Metaldyne Performance Group, Inc. [Member] \| Driveline [Member]
Goodwill [Roll Forward]
Goodwill acquired			0.0
Metaldyne Performance Group, Inc. [Member] \| Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill acquired			0.9
Metaldyne Performance Group, Inc. [Member] \| Powertrain [Member]
Goodwill [Roll Forward]
Goodwill acquired			0.0
Metaldyne Performance Group, Inc. [Member] \| Casting [Member]
Goodwill [Roll Forward]
Goodwill acquired			0.0
USM Mexico Manufacturing LLC [Member]
Goodwill [Roll Forward]
Goodwill acquired			1.3
USM Mexico Manufacturing LLC [Member] \| Driveline [Member]
Goodwill [Roll Forward]
Goodwill acquired			1.3
USM Mexico Manufacturing LLC [Member] \| Metal Forming [Member]
Goodwill [Roll Forward]
Goodwill acquired			0.0
USM Mexico Manufacturing LLC [Member] \| Powertrain [Member]
Goodwill [Roll Forward]
Goodwill acquired			0.0
USM Mexico Manufacturing LLC [Member] \| Casting [Member]
Goodwill [Roll Forward]
Goodwill acquired			$ 0.0