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Commitments and Contingencies (Details)		12 Months Ended
	May 24, 2019	Dec. 31, 2020 USD ($) claim	Aug. 31, 2018 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2000 assessment
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]
Settlement period	60 months
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 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
Maximum | Unfavorable Regulatory Action | Raw Materials Assessment 2
Loss Contingencies [Line Items]
Estimate of possible loss		$ 9,500,000
Maximum | Unfavorable Regulatory Action | Electricity Assessment One
Loss Contingencies [Line Items]
Estimate of possible loss				$ 3,600,000
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					$ 500,000
Maximum | Unfavorable Regulatory Action | Electricity Assessment Four
Loss Contingencies [Line Items]
Estimate of possible loss			$ 7,700,000
PdM Subsidiary | Calcium Carbonate
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed		1,300,000
PdM Subsidiary | Calcium Carbonate, Through 2024
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed		5,100,000
LTRI and PdM Subsidiaries | Energy Cogeneration Steam Supply Agreement
Loss Contingencies [Line Items]
Minimum annual commitments		4,200,000
SWM-B Brazilian Mill | Transmission and Distribution of Energy Agreement
Loss Contingencies [Line Items]
Purchase of electrical energy, estimated annual cost		3,800,000
SWM-B Brazilian Mill | Natural Gas
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed		4,300,000
French Mills | Natural Gas
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed		10,600,000
French Mills | Biomass Consumption
Loss Contingencies [Line Items]
Minimum annual commitments		600,000
French Mills | Electricity
Loss Contingencies [Line Items]
Purchase commitment, remaining amount committed		$ 7,500,000

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