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Goodwill and Intangible Assets -Goodwill - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment charge |  | $ 0.0 | $ 0.0 |  |  | $ 0.0 | $ 55.2 |
Discount rate utilized | 0.09 |  |  |  |  |  |  |
Alternative Investment, Valuation Technique [Extensible List] | us-gaap:IncomeApproachValuationTechniqueMember |  |  |  |  |  |  |
Alternative Investment, Measurement Input [Extensible List] | us-gaap:MeasurementInputDiscountRateMember |  |  |  |  |  |  |
Goodwill |  | 863.5 |  |  |  | 863.5 |  | $ 863.5
Packaging |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | $ 863.5 |  |  |  | $ 863.5 |  | $ 863.5
Paper |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Recoverability test results recoverable percentage | 100.00% |  |  |  |  |  |  |
Paper Reporting Unit |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment charge | $ 55.2 |  |  | $ 55.2 | $ 55.2 |  |  |

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