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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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