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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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