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Arminak & Associates (Details) (Business Acquisition, Arminak & Associates [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Mar. 31, 2013
Feb. 23, 2012
Business Acquisition, Arminak & Associates [Member]
       
Business Acquisition [Line Items]        
Percentage of voting interests acquired       70.00%
Purchase price       $ 67.7
Ownership percentage by noncontrolling owners     30.00%  
Pro forma net sales 305.6      
Pro forma net income attributable to TriMas 14.5      
Acquisition Related Costs $ 1.0 $ 1.3