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Issuance of New Notes Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Payments of Debt Issuance Costs		$ 90.5	$ 0.0
6.25% Notes Due 2025 & 6.50% Notes Due 2027 [Member]
Debt Instrument [Line Items]
Payments of Debt Issuance Costs		$ 36.9
Metaldyne Performance Group, Inc. [Member]
Debt Instrument [Line Items]
Proceeds from Notes Payable	$ 1,200.0
Metaldyne Performance Group, Inc. [Member] | 6.25% Notes due 2025 [Member]
Debt Instrument [Line Items]
Proceeds from Notes Payable	$ 700.0
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Metaldyne Performance Group, Inc. [Member] | 6.50% Notes due 2027 [Member]
Debt Instrument [Line Items]
Proceeds from Notes Payable	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage	6.50%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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