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Acquisitions and Dispositions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 02, 2019
Business Acquisition [Line Items]
Gain on bargain purchase of business	$ 0.0	$ 10.8	$ 0.0
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business, net	0.0	141.2	47.1
Gain (loss) on sale of business	(1.0)	(21.3)	15.5
Sale of U.S. Casting Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business, net		141.2
Impairment of Long-Lived Assets to be Disposed of		225.0
Gain (loss) on sale of business	$ (1.0)	(21.3)
Sale of Powertrain Aftermarket [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of business			15.5
Proceeds from Divestiture of Businesses			$ 50.0
Mitec Automotive AG [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				$ 20.2
Business Combination, Consideration Transferred		9.4
Gain on bargain purchase of business		$ 10.8

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