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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 08, 2017
Schedule Of Commitments And Contingencies [Line Items]
Capital commitments			$ 212,600,000	$ 112,800,000
Purchases during period under purchase agreements			315,000,000.0	341,900,000	$ 339,100,000
Environmental reserve			24,600,000
Environmental liabilities and asset retirement obligations			$ 5,600,000	$ 5,000,000.0
DeRidder, Louisiana
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency, period of occurrence			February 8, 2017
Liability insurance						$ 1,000,000.0
Property damages and business interruption insurance						$ 5,000,000.0
Claim with insurance carrier		$ 17,000,000.0
Insurance proceeds included in net cash provided by operating activities		14,500,000
Insurance proceeds included in net cash provided by investing activities		$ 2,500,000
Payment of penalties	$ 40,000
Asset Retirement Obligation
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve			$ 15,700,000
Environmental Contingencies
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve			8,900,000
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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