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Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Packaging |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges | $ 3.9 | $ 0.9 | $ 13.6 | $ 0.3
Jackson, Alabama Mill | Corrugated Products Facilities |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjustment of asset retirement obligation | $ 4.4 | $ 3.9 | $ 5.7 | $ 5.4

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