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Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) claim	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2000 assessment
Loss Contingencies [Line Items]
Capital expenditures for environmental matters	$ 1,200,000
Capital expenditures for environmental matters, due in two years (less than)	$ 1,000,000.0
Raw Materials Assessment
Loss Contingencies [Line Items]
Settlement period	60 months
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 | Raw Materials Assessment 2
Loss Contingencies [Line Items]
Liability recorded in the consolidated financial statements			$ 1,300,000
Unfavorable Regulatory Action | Electricity Assessment
Loss Contingencies [Line Items]
Number of assessments from the tax authorities regarding ICMS taxes | assessment				4
Number of assessments from the tax authorities regarding ICMS taxes granted injunctions from enforcement | assessment				2
Unfavorable Regulatory Action | Electricity Assessment Four
Loss Contingencies [Line Items]
Liability recorded in the consolidated financial statements	$ 0
Indemnification Agreement
Loss Contingencies [Line Items]
Number of pending claims | claim	0
LTRI and PdM Subsidiaries | Energy Cogeneration Steam Supply Agreement
Loss Contingencies [Line Items]
Minimum annual commitments	$ 6,000,000.0
SWM-B Brazilian Mill | Transmission and Distribution of Energy Agreement
Loss Contingencies [Line Items]
Purchase of electrical energy, estimated annual cost	2,400,000
Calcium Carbonate | PdM Subsidiary
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed	1,200,000
Calcium Carbonate, Through 2024 | PdM Subsidiary
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed	7,000,000.0
Natural Gas | SWM-B Brazilian Mill
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed	6,900,000
Maximum | Unfavorable Regulatory Action | Raw Materials Assessment 2
Loss Contingencies [Line Items]
Estimate of possible loss	12,100,000
Maximum | Unfavorable Regulatory Action | Electricity Assessment One
Loss Contingencies [Line Items]
Estimate of possible loss	3,800,000
Maximum | Unfavorable Regulatory Action | Electricity Assessment Two
Loss Contingencies [Line Items]
Estimate of possible loss	6,900,000
Maximum | Unfavorable Regulatory Action | Electricity Assessment Three
Loss Contingencies [Line Items]
Estimate of possible loss	700,000
Maximum | Unfavorable Regulatory Action | Electricity Assessment Four
Loss Contingencies [Line Items]
Estimate of possible loss	9,700,000
Natural Gas | French Mills
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed	2,800,000
Biomass Consumption | French Mills
Loss Contingencies [Line Items]
Minimum annual commitments	600,000
Forecast | French Mills | Electricity
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed		$ 6,100,000
Interest expense | Raw Materials Assessment
Loss Contingencies [Line Items]
Litigation settlement, expense	$ (600,000)

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