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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.

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