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Long-Term Debt Repayment of MPG Indebtedness (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Apr. 06, 2017
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost	$ 2.7
Metaldyne Performance Group, Inc. [Member]
Debt Instrument [Line Items]
Debt acquired		$ 1,918.7
Interest Paid	$ 24.6
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		$ 650.0

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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+ References

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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