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Commitments and Contingencies Metaldyne Corporation (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2007 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |
Common Stock Dividends, Shares | 4,825,587 |
Loss Contingency, Estimate of Possible Loss |  | $ 7,600,000
Loss Contingency, Range of Possible Loss, Portion Not Accrued |  | $ 2,400,000
Allocated Share of Liabilities Not Readily Associated with the Business - TriMas |  | 42.01%
Allocated Share of Liabilities Not Readily Associated with the Business - Metaldyne |  | 57.99%
Indemnification Deductible |  | $ 50,000
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss |  | $ 10,000,000

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