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Repayment of MPG Indebtedness (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 06, 2017
Debt Instrument [Line Items]
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 199.7	$ 182.7	$ 87.2
Metaldyne Performance Group, Inc. [Member]
Debt Instrument [Line Items]
Debt acquired				$ 1,918.7
Interest Paid, Excluding Capitalized Interest, Operating Activities		24.6
Write off of Deferred Debt Issuance Cost		$ 2.7
Metaldyne Performance Group, Inc. [Member] | Euro Denominated Term Loan [Member]
Debt Instrument [Line Items]
Debt acquired				200.0
Metaldyne Performance Group, Inc. [Member] | U.S. Dollar Denominated Term Loan [Member] [Member]
Debt Instrument [Line Items]
Debt acquired				1,000.0
Metaldyne Performance Group, Inc. [Member] | MPG Bonds [Member]
Debt Instrument [Line Items]
Debt acquired				$ 700.0

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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