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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |  |
Beginning Balance |  |  | $ 863,500,000 | $ 918,700,000 |
Impairment of Paper segment |  | $ 0 | 0 | (55,200,000) | $ 0
Ending Balance |  | 923,500,000 | 923,500,000 | 863,500,000 | 918,700,000
Advance Packaging Corporation [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquisitions | [1] |  | 60,000,000.0 |  |
Ending Balance |  | 60,000,000.0 | 60,000,000.0 |  |
Packaging |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning Balance |  |  | 863,500,000 | 863,500,000 |
Ending Balance |  | 923,500,000 | 923,500,000 | 863,500,000 | 863,500,000
Packaging | Advance Packaging Corporation [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquisitions | [1] |  | 60,000,000.0 |  |
Paper |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning Balance |  |  | 0 | 55,200,000 |
Impairment of Paper segment |  |  |  | (55,200,000) |
Ending Balance |  | $ 0 | 0 | $ 0 | $ 55,200,000
Paper | Advance Packaging Corporation [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquisitions | [1] |  | $ 0 |  |
[1] | In connection with the December 2021 acquisition of Advance Packaging, the Company recorded $60.0 million of goodwill in the Packaging segment.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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