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Commitments and Contingencies (Details) - Unfavorable Regulatory Action | May 24, 2019 USD ($) | Sep. 30, 2020 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2000 assessment
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Raw Materials Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of assessments from the tax authorities regarding ICMS taxes | assessment |  |  |  |  | 2
Raw Materials Assessment 2 |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimated possible loss | $ 8,700,000 |  |  |  |
Settlement period | 60 months |  |  |  |
Electricity Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of assessments from the tax authorities regarding ICMS taxes | assessment |  |  |  |  | 4
Electricity Assessment One |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimated possible loss |  |  |  | $ 3,300,000 |
Second Electricity Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimated possible loss |  |  |  | $ 6,300,000 |
Electricity Assessment Three |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimated possible loss |  |  | $ 500,000 |  |
Electricity Assessment Four |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimated possible loss |  |  | $ 7,100,000 |  |
Raw Materials Assessment And Remaining Electricity Assessments |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Liability recorded |  | $ 0 |  |  |

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