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Goodwill and Intangible Assets -Goodwill - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | May 31, 2020
Goodwill [Line Items] |  |  |  |
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 |
Packaging |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | $ 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 |  |  |

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