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Goodwill and Intangible Assets -Goodwill - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2020 | Dec. 31, 2021 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |  |  |
Goodwill impairment charge |  | $ 0 |  | $ 0 | $ 55,200,000 | $ 0
Discount rate utilized | 0.09 |  |  |  |  |
Goodwill |  | 923,500,000 |  | 923,500,000 | 863,500,000 | 918,700,000
Packaging |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  | 923,500,000 |  | 923,500,000 | 863,500,000 | 863,500,000
Paper |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  | 55,200,000 |
Goodwill |  | $ 0 |  | $ 0 | $ 0 | $ 55,200,000
Recoverability Test Results Recoverable Percentage | 100.00% |  |  |  |  |
Paper Reporting Unit |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill impairment charge | $ 55,200,000 |  | $ 55,200,000 |  |  |

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