Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning balance	$ 699.1	$ 1,141.8
Reorganization		0.0
Impairment charge	(510.0)	(440.0)
Foreign currency translation	(3.4)	(2.7)
Ending balance	185.7	699.1	$ 1,141.8
Driveline [Member]
Goodwill [Roll Forward]
Beginning balance	398.3	212.1
Reorganization		187.2
Impairment charge	(210.8)	0.0
Foreign currency translation	(1.8)	(1.0)
Ending balance	185.7	398.3	212.1
Metal Forming [Member]
Goodwill [Roll Forward]
Beginning balance	300.8	552.4
Reorganization		190.1
Impairment charge	(299.2)	(440.0)
Foreign currency translation	(1.6)	(1.7)
Ending balance	0.0	300.8	552.4
Powertrain [Member]
Goodwill [Roll Forward]
Beginning balance	0.0	377.3
Reorganization		(377.3)
Impairment charge	0.0	0.0	(80.0)
Foreign currency translation	0.0	0.0
Ending balance	$ 0.0	$ 0.0	$ 377.3

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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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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.

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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.

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