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Commitments and Contingencies (Details) | Apr. 09, 2021 USD ($) | Jun. 30, 2021 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2000 assessment
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Raw Materials Assessment | SWM-B Brazilian Mill |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Liability recorded |  | $ 8,600,000 |  |  |
Loss contingency accrual, payments | $ 2,600,000 |  |  |  |
Recognized total benefit on settlement | 6,100,000 |  |  |  |
Raw Materials Assessment | SWM-B Brazilian Mill | Interest expense |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Recognized total benefit on settlement | 4,500,000 |  |  |  |
Raw Materials Assessment | SWM-B Brazilian Mill | Other expense, net |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Recognized total benefit on settlement | $ 1,600,000 |  |  |  |
Raw Materials Assessment | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of assessments from the tax authorities regarding ICMS taxes | assessment |  |  |  |  | 2
Electricity Assessment | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of assessments from the tax authorities regarding ICMS taxes | assessment |  |  |  |  | 4
Electricity Assessment One | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Electricity Assessment |  |  |  | $ 3,700,000 |
Electricity Assessment Two | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Electricity Assessment |  |  |  | $ 7,200,000 |
Electricity Assessment Three | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Electricity Assessment |  |  | $ 600,000 |  |
Electricity Assessment Four | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Electricity Assessment |  |  | $ 8,000,000.0 |  |
Raw Materials Assessment And Remaining Electricity Assessments | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Liability recorded |  | $ 0 |  |  |

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