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Commitments and Contingencies Metaldyne Corporation (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2007 | Dec. 31, 2012
Loss Contingencies [Line Items] |  |
Common Stock Dividends, Shares | 4,825,587 |
Loss Contingency, Estimate of Possible Loss |  | $ 6,000,000
Loss Contingency, Range of Possible Loss, Maximum |  | 8,400,000
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

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