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Commitments and Contingencies (Details)
1 Months Ended 9 Months Ended
Oct. 19, 2018
USD ($)
Jun. 04, 2018
USD ($)
Mar. 24, 2017
USD ($)
Sep. 30, 2019
USD ($)
claim
Aug. 31, 2005
USD ($)
Sep. 30, 2019
USD ($)
claim
defendant
Sep. 30, 2019
BRL (R$)
claim
Jun. 13, 2019
USD ($)
Dec. 31, 2018
USD ($)
Commitments and Contingencies                  
Minority interest       35.00%   35.00% 35.00%    
Reserve for loss contingencies       $ 7,000,000.0   $ 7,000,000.0      
Penalties per day       1,300   1,300 R$ 5,000    
Pennsylvania Department Of Environmental Protection, Processed Slag | Threatened Litigation                  
Commitments and Contingencies                  
Loss contingency reserves               $ 400,000  
Lima Refinery Litigation [Member]                  
Commitments and Contingencies                  
Litigation Settlement, Amount Awarded to Other Party       195,000,000          
Netherlands                  
Commitments and Contingencies                  
Damages sought - interest, penalties and fees $ 500,000                
Allegheny County Health Department [Member]                  
Commitments and Contingencies                  
Damages sought - interest, penalties and fees     $ 100,000            
Brazilian Tax Disputes - Jan 2004 through May 2005 | Sao Paulo State Revenue Authority                  
Commitments and Contingencies                  
Damages sought - interest, penalties and fees           20,000,000      
Damages sought - principal           2,000,000      
Loss contingency, reduced penalty   $ 2,000,000              
Amount of damages sought   $ 9,000,000              
Brazilian Tax Disputes - Jan 2002 through Dec 2003 | Sao Paulo State Revenue Authority                  
Commitments and Contingencies                  
Damages sought - interest, penalties and fees         $ 4,600,000        
Damages sought - principal         1,400,000        
Loss contingency, reduced penalty         1,200,000        
Amount of damages sought         6,000,000.0        
Loss contingency, reduced penalty, including interest         $ 10,000,000        
Brazilian Labor Claims                  
Commitments and Contingencies                  
Loss contingency reserves       $ 5,900,000   $ 5,900,000     $ 7,100,000
Other                  
Commitments and Contingencies                  
Approximate number of defendants that includes the company named in legal actions | defendant           90      
Number of pending claims | claim       17,131   17,131 17,131    
Number of claims dismissed to date by stipulation or summary judgment prior to trial | claim           28,216      
Other | Active or In Extremis docket                  
Commitments and Contingencies                  
Number of pending claims | claim       37   37 37    
Other | Minimum                  
Commitments and Contingencies                  
Amount of damages sought           $ 20,000,000      
Other | Maximum                  
Commitments and Contingencies                  
Amount of damages sought           $ 25,000,000      
Other | New York County as managed by the New York Supreme Court                  
Commitments and Contingencies                  
Number of pending claims | claim       16,587   16,587 16,587    
Other | New York County as managed by the New York Supreme Court | Pending And Future Litigation, Deferred Or Inactive Docket                  
Commitments and Contingencies                  
Number of pending claims | claim       16,550   16,550 16,550    
Other | New York State Supreme Court, Counties Excluding New York County                  
Commitments and Contingencies                  
Number of pending claims | claim       117   117 117    
Other | Courts Located In States Other Than New York                  
Commitments and Contingencies                  
Number of pending claims | claim       427   427 427    
CSN                  
Commitments and Contingencies                  
Penalties per day | R$             R$ 20,000