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Joint Ventures and Noncontrolling Interests (Details)
12 Months Ended
Dec. 31, 2019
Oct. 22, 2018
Eagle Steel Products, Inc.    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in equity method investment sold 45.00%  
Oregon Feralloy Partners LLC    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in equity method investment 40.00%  
Acero Prime S. de R.L. de C.V.    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in consolidated investments other than equity method investment 100.00% 60.00%
Feralloy Processing Company    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in consolidated investments other than equity method investment 51.00%  
Indiana Pickling & Processing Company    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in consolidated investments other than equity method investment 56.00%  
Valex Corp. | South Korea    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in consolidated investments other than equity method investment 96.00%  
Minimum    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in equity method investment 20.00%  
Percentage of ownership for consolidation of financial statements 50.00%  
Maximum    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in equity method investment 50.00%