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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended
Jun. 04, 2018
USD ($)
Aug. 31, 2005
USD ($)
Mar. 31, 2020
USD ($)
claim
defendant
case
Apr. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 01, 2019
USD ($)
Nov. 01, 2019
BRL (R$)
Jun. 13, 2019
USD ($)
Mar. 19, 2019
USD ($)
Mar. 19, 2019
BRL (R$)
Commitments and Contingencies                    
Reserve for loss contingencies     $ 7,000,000.0              
Penalties per day           $ 5,000 R$ 25,000   $ 1,000 R$ 5,000
Penalties           1,900,000 10,000,000      
Pennsylvania Department Of Environmental Protection, Processed Slag | Threatened Litigation                    
Commitments and Contingencies                    
Loss contingency reserves               $ 400,000    
Netherlands                    
Commitments and Contingencies                    
Damages sought - interest, penalties and fees     500,000              
Allegheny County Health Department [Member]                    
Commitments and Contingencies                    
Penalties       $ 4,500            
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     16,200,000              
Damages sought - principal     1,200,000              
Loss contingency, reduced penalty $ 1,000,000                  
Amount of damages sought $ 7,000,000                  
Brazilian Tax Disputes - Jan 2002 through Dec 2003 | Sao Paulo State Revenue Authority                    
Commitments and Contingencies                    
Damages sought - interest, penalties and fees   $ 3,700,000                
Damages sought - principal   1,200,000                
Loss contingency, reduced penalty   1,200,000                
Amount of damages sought   4,900,000                
Loss contingency, reduced penalty, including interest   $ 10,000,000                
Brazilian Labor Claims                    
Commitments and Contingencies                    
Loss contingency reserves     $ 5,000,000.0   $ 6,500,000          
Other                    
Commitments and Contingencies                    
Approximate number of defendants that includes the company named in legal actions | defendant     90              
Number of pending claims | claim     17,138              
Number of claims dismissed to date by stipulation or summary judgment prior to trial | case     28,245              
Other | Active or In Extremis docket                    
Commitments and Contingencies                    
Number of pending claims | claim     35              
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 | case     16,585              
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              
Other | New York State Supreme Court, Counties Excluding New York County                    
Commitments and Contingencies                    
Number of pending claims | case     118              
Other | Courts Located In States Other Than New York                    
Commitments and Contingencies                    
Number of pending claims | case     435              
CSN                    
Commitments and Contingencies                    
Penalties per day           $ 19,000 R$ 100,000   $ 4,000 R$ 20,000
Bahrain Operations, Salt Cake Processing Site [Member]                    
Commitments and Contingencies                    
Minority interest     35.00%