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Summary of Significant Accounting Policies, Textuals (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Significant accounting policies    
Percentage of Employees Covered by Collective Bargaining Agreements 63.00%  
Percentage of Employees Covered by Collective Bargaining Agreements Expiring Within One Year 0.00%  
Fabricated Products    
Significant accounting policies    
Excess of current cost over the stated LIFO value of inventory $ 10.2 $ 37.6