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Commitments and Contingencies (Details)
Apr. 09, 2021
USD ($)
Mar. 31, 2021
USD ($)
Aug. 31, 2018
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2000
assessment
SWM-B Brazilian Mill | Raw Materials Assessment          
Loss Contingencies [Line Items]          
Liability recorded   $ 8,600,000      
SWM-B Brazilian Mill | Raw Materials Assessment | Subsequent event          
Loss Contingencies [Line Items]          
Loss contingency accrual, payments $ 2,600,000        
Reduction of tax liability, percent 70.00%        
Recognized total benefit on settlement $ 6,100,000        
SWM-B Brazilian Mill | Raw Materials Assessment | Subsequent event | Interest expense          
Loss Contingencies [Line Items]          
Recognized total benefit on settlement 4,600,000        
SWM-B Brazilian Mill | Raw Materials Assessment | Subsequent event | Other Expense          
Loss Contingencies [Line Items]          
Recognized total benefit on settlement $ 1,600,000        
Unfavorable Regulatory Action | Raw Materials Assessment          
Loss Contingencies [Line Items]          
Number of assessments from the tax authorities regarding ICMS taxes | assessment         2
Unfavorable Regulatory Action | Electricity Assessment          
Loss Contingencies [Line Items]          
Number of assessments from the tax authorities regarding ICMS taxes | assessment         4
Unfavorable Regulatory Action | Electricity Assessment One          
Loss Contingencies [Line Items]          
Electricity Assessment       $ 3,300,000  
Unfavorable Regulatory Action | Second Electricity Assessment          
Loss Contingencies [Line Items]          
Electricity Assessment       $ 6,300,000  
Unfavorable Regulatory Action | Electricity Assessment Three          
Loss Contingencies [Line Items]          
Electricity Assessment     $ 500,000    
Unfavorable Regulatory Action | Electricity Assessment Four          
Loss Contingencies [Line Items]          
Electricity Assessment     $ 7,000,000.0    
Unfavorable Regulatory Action | Raw Materials Assessment And Remaining Electricity Assessments          
Loss Contingencies [Line Items]          
Liability recorded   $ 0