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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Summary of Significant Accounting Policies  
Schedule of estimated useful lives of property, plant and equipment

Buildings

   311/2 years

Machinery and equipment

   3 - 20 years
Schedule of sales, by products or services
  2013   2012   2011  

Carbon steel

     53 %   51 %   53 %

Aluminum

     15 %   15 %   15 %

Stainless steel

     14 %   15 %   15 %

Alloy steel

     10 %   12 %   10 %

Toll processing

     2 %   2 %   2 %

Other

     6 %   5 %   5 %
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

     100 %   100 %   100 %
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Summary of the Company's operations by geographic location based on where sales originated from
  United States   Foreign
Countries		   Total  
 
   (in millions)
  

Year Ended December 31, 2013

                    

Net sales

   $ 8,682.2   $ 541.6   $ 9,223.8  

Long-lived assets

     4,296.6     305.5     4,602.1  

Year Ended December 31, 2012

                    

Net sales

     7,861.3     581.0     8,442.3  

Long-lived assets

     3,270.9     309.4     3,580.3  

Year Ended December 31, 2011

                    

Net sales

     7,647.4     487.3     8,134.7  

Long-lived assets

     3,035.1     296.1     3,331.2