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Commitments and Contingencies (Details) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) employee claim | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 EUR (€) employee claim | Dec. 31, 2000 assessment
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |
2019 | $ 5,800,000 |  |  |  |
2020 | 5,000,000 |  |  |  |
2021 | 4,400,000 |  |  |  |
2022 | 3,600,000 |  |  |  |
2023 | 3,000,000 |  |  |  |
Thereafter | 8,100,000 |  |  |  |
Total | 29,900,000 |  |  |  |
Rent expense | 6,700,000 | $ 6,400,000 | $ 6,900,000 |  |
Loss Contingencies [Line Items] |  |  |  |  |
Capital expenditures for environmental matters | 1,000,000 |  |  |  |
Capital expenditures for environmental matters, due in two years (less than) | 1,000,000 |  |  |  |
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
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 |  |  |  |
Unfavorable Regulatory Action | Malaucene Co-Employment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Liability recorded in the consolidated financial statements | $ 0 |  |  |  |
Indemnification Agreement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of pending claims | claim | 0 |  |  | 0 |
LTRI and PdM Subsidiaries | Energy Cogeneration Steam Supply Agreement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Minimum annual commitments | $ 7,500,000 |  |  |  |
SWM-B Brazilian Mill | Transmission and Distribution of Energy Agreement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase of electrical energy, estimated annual cost | 3,100,000 |  |  |  |
French Mills | Electricity |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase commitment, remaining amount committed | 6,400,000 |  |  |  |
Calcium Carbonate | PdM Subsidiary |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase commitment, remaining amount committed | 1,500,000 |  |  |  |
Calcium Carbonate, Through 2024 | PdM Subsidiary |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase commitment, remaining amount committed | 9,100,000 |  |  |  |
Natural Gas | SWM-B Brazilian Mill |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase commitment, remaining amount committed | 7,000,000 |  |  |  |
Maximum | Unfavorable Regulatory Action | Raw Materials Assessment 2 |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | 11,200,000 |  |  |  |
Maximum | Unfavorable Regulatory Action | Electricity Assessment One |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | 4,600,000 |  |  |  |
Maximum | Unfavorable Regulatory Action | Electricity Assessment Two |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | 8,400,000 |  |  |  |
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 | $ 9,200,000 |  |  |  |
Maximum | Unfavorable Regulatory Action | Malaucene Co-Employment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | € |  |  |  | € 1.3 |
Number of pending claims | employee | 18 |  |  | 18 |
Natural Gas | French Mills |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Purchase commitment, remaining amount committed | $ 3,100,000 |  |  |  |
Biomass Consumption | French Mills |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Minimum annual commitments | $ 1,700,000 |  |  |  |

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