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Environmental and Legal Contingencies (Details 6) - USD ($)
$ in Millions
1 Months Ended
Mar. 31, 2014
Jan. 11, 2016
Dec. 23, 2015
Dec. 16, 2015
Nov. 02, 2015
Antitrust Case [Member]          
Loss Contingencies [Line Items]          
Payments for Legal Settlements $ 5.8        
US Trade Case - CORE [Member] | Countervailing Duty [Member] | Preliminary [Member] | CHINA | Minimum [Member]          
Loss Contingencies [Line Items]          
Duty Rate         26.26%
US Trade Case - CORE [Member] | Countervailing Duty [Member] | Preliminary [Member] | CHINA | Maximum [Member]          
Loss Contingencies [Line Items]          
Duty Rate         235.66%
US Trade Case - CORE [Member] | Countervailing Duty [Member] | Preliminary [Member] | INDIA | Minimum [Member]          
Loss Contingencies [Line Items]          
Duty Rate         2.85%
US Trade Case - CORE [Member] | Countervailing Duty [Member] | Preliminary [Member] | INDIA | Maximum [Member]          
Loss Contingencies [Line Items]          
Duty Rate         7.71%
US Trade Case - CORE [Member] | Countervailing Duty [Member] | Preliminary [Member] | ITALY | Minimum [Member]          
Loss Contingencies [Line Items]          
Duty Rate         0.00%
US Trade Case - CORE [Member] | Countervailing Duty [Member] | Preliminary [Member] | ITALY | Maximum [Member]          
Loss Contingencies [Line Items]          
Duty Rate         38.41%
US Trade Case - CORE [Member] | Countervailing Duty [Member] | Preliminary [Member] | KOREA, REPUBLIC OF | Minimum [Member]          
Loss Contingencies [Line Items]          
Duty Rate         0.00%
US Trade Case - CORE [Member] | Countervailing Duty [Member] | Preliminary [Member] | KOREA, REPUBLIC OF | Maximum [Member]          
Loss Contingencies [Line Items]          
Duty Rate         1.37%
US Trade Case - CORE [Member] | Antidumping Duty [Member] | Preliminary [Member] | CHINA          
Loss Contingencies [Line Items]          
Duty Rate     255.80%    
US Trade Case - CORE [Member] | Antidumping Duty [Member] | Preliminary [Member] | INDIA | Minimum [Member]          
Loss Contingencies [Line Items]          
Duty Rate     6.64%    
US Trade Case - CORE [Member] | Antidumping Duty [Member] | Preliminary [Member] | INDIA | Maximum [Member]          
Loss Contingencies [Line Items]          
Duty Rate     6.92%    
US Trade Case - CORE [Member] | Antidumping Duty [Member] | Preliminary [Member] | ITALY | Minimum [Member]          
Loss Contingencies [Line Items]          
Duty Rate     0.00%    
US Trade Case - CORE [Member] | Antidumping Duty [Member] | Preliminary [Member] | ITALY | Maximum [Member]          
Loss Contingencies [Line Items]          
Duty Rate     3.11%    
US Trade Case - CORE [Member] | Antidumping Duty [Member] | Preliminary [Member] | KOREA, REPUBLIC OF | Minimum [Member]          
Loss Contingencies [Line Items]          
Duty Rate     2.99%    
US Trade Case - CORE [Member] | Antidumping Duty [Member] | Preliminary [Member] | KOREA, REPUBLIC OF | Maximum [Member]          
Loss Contingencies [Line Items]          
Duty Rate     3.51%    
US Trade Case - ColdRolled [Member] | Countervailing Duty [Member] | Preliminary [Member] | CHINA          
Loss Contingencies [Line Items]          
Duty Rate       227.29%  
US Trade Case - ColdRolled [Member] | Countervailing Duty [Member] | Preliminary [Member] | INDIA          
Loss Contingencies [Line Items]          
Duty Rate       4.45%  
US Trade Case - ColdRolled [Member] | Countervailing Duty [Member] | Preliminary [Member] | BRAZIL          
Loss Contingencies [Line Items]          
Duty Rate       7.42%  
US Trade Case - ColdRolled [Member] | Countervailing Duty [Member] | Preliminary [Member] | SOVIET UNION | Minimum [Member]          
Loss Contingencies [Line Items]          
Duty Rate       0.00%  
US Trade Case - ColdRolled [Member] | Countervailing Duty [Member] | Preliminary [Member] | SOVIET UNION | Maximum [Member]          
Loss Contingencies [Line Items]          
Duty Rate       6.33%  
Subsequent Event [Member] | US Trade Case - HotRolled [Member] | Countervailing Duty [Member] | Preliminary [Member] | BRAZIL          
Loss Contingencies [Line Items]          
Duty Rate   7.42%