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Subsequent Events (Notes)	12 Months Ended
	Dec. 31, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	22. Subsequent Event On January 11, 2018, the U.S. Bankruptcy Court entered a final decree to close all remaining cases and finalize the Metaldyne bankruptcy distribution trust. Any proof of claim filed against any of the Debtors subsequent to the entry of the final decree shall be deemed disallowed and expunged by the U.S. Bankruptcy Court. In consideration of this final decree, the Company expects to make a final assessment of its estimated liability in the first quarter of 2018. See Note 14, "Commitments and Contingencies" for further information.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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