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Quarterly Results of Operations (Unaudited) - Summary of Quarterly Financial Data (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Quarterly Financial Data [Line Items] |  |  |  |
Goodwill impairment charge | $ 0.0 |  |  |
Paper Reporting Unit | Jackson Alabama Mill [Member] |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |
Restructuring charges |  |  | $ 8.8 |
Paper [Member] | Jackson Alabama Mill [Member] |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |
Restructuring charges |  |  |  | $ 9.3
Packaging [Member] |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |
Restructuring charges |  | $ 14.4 |  |

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