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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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