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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 08, 2017
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Capital commitments |  | $ 304,200,000 | $ 212,600,000 |  |
Purchases during period under purchase agreements |  | 317,600,000 | 315,000,000.0 | $ 341,900,000 |
Environmental reserve |  | 23,600,000 |  |  |
Environmental liabilities and asset retirement obligations |  | $ 4,600,000 | $ 5,600,000 |  |
DeRidder, Louisiana |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Loss contingency, period of occurrence |  | February 8, 2017 |  |  |
Liability insurance |  |  |  |  | $ 1,000,000.0
Payment of penalties | $ 40,000 |  |  |  |
Asset Retirement Obligation |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  | $ 15,500,000 |  |  |
Environmental Contingencies |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  | 8,100,000 |  |  |
Other Long-Term Liabilities |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  | $ 19,000,000.0 |  |  |
Minimum |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Purchase commitments term, years |  | 1 year |  |  |
Maximum |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Purchase commitments term, years |  | 31 years |  |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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