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Other Income (Expense), Net - Components of Other Income (Expense), Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Asset disposals and write-offs $ (9.0) $ (7.5) $ (22.2) $ (33.9)
Facilities closure and other income (costs) (a) [1] (0.1) (0.2) 7.0 (0.4)
Jackson mill conversion-related activities (b) [2] 0.0 (2.7) (1.5) (4.8)
Other (1.0) (2.9) (6.4) (6.4)
Total $ (9.9) $ (12.9) $ (37.1) $ (44.7)
[1] For the three and nine months ended September 30, 2023, includes income and charges consisting of closure costs related to the closure of corrugated products facilities and design centers. Included therein are closure costs as well as the gain on sale of a corrugated products facility. For the three months ended September 30, 2022, includes income consisting of a gain on sale of assets related to a corrugated products facility, partially offset by charges consisting of closure costs related to corrugated products facilities. For the nine months ended September 30, 2022, includes income primarily related to insurance proceeds received for a natural disaster at one of the corrugated products facilities and a gain on sale of assets related to a corrugated products facility, partially offset by closure costs related to corrugated products facilities and acquisition and integration costs related to the December 2021 Advance Packaging acquisition.
[2] Includes charges related to the announced discontinuation of production of uncoated freesheet paper grades on the No. 3 machine at the Jackson, Alabama mill associated with the permanent conversion of the machine to produce linerboard and other paper-to-containerboard conversion related activities.