Summary of Significant Accounting Policies - Additional Information (Details)			3 Months Ended	6 Months Ended	12 Months Ended
		May 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) a	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items]
Research and development costs					$ 14,500,000	$ 15,500,000	$ 16,000,000.0
Cash and cash equivalents			$ 618,700,000		618,700,000	974,600,000
Cash equivalents			532,900,000		532,900,000	662,200,000
Other-than-temporary impairment charges on available-for-sale securities					0	0
Allowance for doubtful accounts			4,900,000		$ 4,900,000	3,000,000.0
Customer returns, allowances and earned discounts as a percentage of gross selling price					1.00%
Reserve for customer accounts receivable, percentage					1.00%
Reserve for customer deductions					$ 9,400,000	7,600,000
Interest capitalization, construction in progress					3,800,000	3,700,000	3,400,000
Depreciation expense					376,000,000.0	362,500,000	346,800,000
Incremental depreciation					$ 4,700,000	$ 4,500,000	300,000
Intangible asset, useful life, in years					8 years 6 months	9 years 1 month 6 days
Goodwill			923,500,000		$ 923,500,000	$ 863,500,000	918,700,000
Goodwill and intangible asset impairment					0	0	0
Goodwill impairment			0		0	55,200,000	0
Deferred financing costs			19,500,000		$ 19,500,000	14,300,000
Area leased under timberland cutting rights (acres) | a					65,000
Depletion expense					$ 2,000,000.0	3,100,000	2,700,000
Software amortization expense					1,600,000	1,100,000	900,000
Cloud computing arrangements			2,800,000		2,800,000	4,000,000.0
Total operating lease obligations			246,400,000		$ 246,400,000	242,500,000
Net Sales [Member] | Customer | Customer Concentration Risk [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk, percentage					5.00%
Other long-term assets
Summary of Significant Accounting Policies [Line Items]
Long-term lease costs capitalization (Cutting rights)			21,000,000.0		$ 21,000,000.0	20,300,000
Net capitalized software costs			3,300,000		3,300,000	4,800,000
New Accounting Pronouncements [Member] | Long-term debt
Summary of Significant Accounting Policies [Line Items]
Deferred financing costs			19,500,000		$ 19,500,000	$ 14,300,000
Paper Reporting Unit [Member]
Summary of Significant Accounting Policies [Line Items]
Goodwill impairment		$ 55,200,000		$ 55,200,000
Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	[1],[2]				8 years 6 months	9 years 1 month 6 days
Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	[2]				8 years 4 months 24 days	9 years 3 months 18 days
Paper
Summary of Significant Accounting Policies [Line Items]
Goodwill			0		$ 0	$ 0	$ 55,200,000
Goodwill impairment						55,200,000
Recoverability test results recoverable percentage		100.00%
Minimum
Summary of Significant Accounting Policies [Line Items]
Term of senior credit facilities and notes, in years					10 years
Minimum | Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					10 years
Minimum | Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					5 years
Maximum
Summary of Significant Accounting Policies [Line Items]
Term of senior credit facilities and notes, in years					30 years
Maximum | Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					40 years
Maximum | Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years					20 years
Foreign operations
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents			$ 1,200,000		$ 1,200,000	$ 2,200,000

[1] During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.

[2] In connection with the December 2021 acquisition of Advance Packaging, the Company recorded intangible assets of $47.3 million for customer relationships, $2.8 million for trade names, and $0.1 million for other intangibles.