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Commitments and Contingencies (Details)
 1 Months Ended 9 Months Ended
Jun. 04, 2018
USD ($)
Dec. 31, 2018
USD ($)
Aug. 31, 2005
USD ($)
Sep. 30, 2021
USD ($)
enforcementAction
case
defendant
claim
Dec. 31, 2020
USD ($)
Dec. 30, 2020
USD ($)
Jan. 27, 2020
party
Nov. 01, 2019
USD ($)
Nov. 01, 2019
BRL (R$)
Mar. 18, 2019
USD ($)
Mar. 18, 2019
BRL (R$)
Commitments and Contingencies                      
Number Of Potentially Related Parties | party             20        
Reserve for loss contingencies       $ 7,000,000              
Penalties per day               $ 5,000 R$ 25,000 $ 1,000 R$ 5,000
Penalties               2,000,000 10,000,000    
Current Portion of Environmental Liabilities       7,005,000 $ 6,933,000            
Environmental liabilities       28,589,000 29,424,000            
Total environmental liabilities       $ 35,594,000 36,357,000            
Enforcement Actions | enforcementAction       3              
Netherlands                      
Commitments and Contingencies                      
Damages sought - interest, penalties and fees       $ 700,000              
BRAZIL                      
Commitments and Contingencies                      
Loss Contingencies, Unpaid Service Taxes           $ 2,000,000          
Loss Contingencies, Overall Liability       3,300,000              
Brazilian Tax Disputes - Jan 2004 through May 2005 | Sao Paulo State Revenue Authority                      
Commitments and Contingencies                      
Damages sought - interest, penalties and fees       15,800,000              
Damages sought - principal       1,100,000              
Loss contingency, reduced penalty $ 1,100,000                    
Amount of damages sought $ 6,700,000                    
Brazilian Tax Disputes - Jan 2002 through Dec 2003 | Sao Paulo State Revenue Authority                      
Commitments and Contingencies                      
Damages sought - interest, penalties and fees     $ 3,600,000                
Damages sought - principal     1,100,000                
Loss contingency, reduced penalty   $ 800,000                  
Amount of damages sought     $ 4,700,000                
Loss contingency, reduced penalty, including interest   $ 5,200,000                  
Brazilian Labor Claims                      
Commitments and Contingencies                      
Loss contingency reserves       $ 3,500,000 $ 4,300,000            
Other                      
Commitments and Contingencies                      
Approximate number of defendants that includes the company named in legal actions | defendant       90              
Number of pending claims | claim       17,200              
Number of claims dismissed to date by stipulation or summary judgment prior to trial | case       28,350              
Other | Active or In Extremis docket                      
Commitments and Contingencies                      
Number of pending claims | claim       60              
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       16,610              
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       120              
Other | Courts Located In States Other Than New York                      
Commitments and Contingencies                      
Number of pending claims | case       470              
CSN                      
Commitments and Contingencies                      
Penalties per day               $ 18,000 R$ 100,000 $ 4,000 R$ 20,000