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Segment Information - Analysis of Operations by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |  |
Goodwill impairment charge |  |  | $ 0.0 |  |  |
Charges for disposal of fixed assets |  |  |  | $ (9.1) | $ (15.2) | $ (6.1)
Acquisition and integration related costs | [1] |  |  | 0.0 | 0.0 | 0.6
Gain on Sale of Transportation Assets |  |  |  |  |  | 0.8
Business Combination Acquisition And Integration Related Costs | [1] |  |  | 0.0 | 0.0 | 0.6
Debt Refinancing Cost |  | $ 58.9 |  |  |  |
Advance Packaging Corporation [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 0.4
Acquisition and integration related costs |  |  |  |  | 1.0 | 0.5
Business Combination Acquisition And Integration Related Costs |  |  |  |  | 1.0 | 0.5
Packaging |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 14.4 |  |
Acquisition and integration related costs |  |  |  |  |  | 0.4
Business Combination Acquisition And Integration Related Costs |  |  |  |  |  | 0.4
Corrugated Products Facilities |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 0.7 |
Jackson Alabama Mill [Member] | Corrugated Products Facilities |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Adjustment of asset retirement obligation |  |  |  | $ 11.1 |  | 4.3
Jackson Alabama Mill [Member] | Paper |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 9.3
Adjustment of asset retirement obligation |  |  |  |  | 5.3 |
Jackson Alabama Mill [Member] | Paper Reporting Unit |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ 8.8 |
San Lorenzo, California [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 2.8
[1] | Includes charges related to the December 2021 Advance Packaging Corporation acquisition.

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