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Segment Information - Analysis of Operations by Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | $ 7,802.4 |  | $ 8,478.0 |  | $ 7,730.3 |
Operating Income (Loss) |  | 1,075.1 |  | 1,420.7 |  | 1,241.4 |
Non-operating pension income and expense |  | (7.7) |  | 14.5 |  | 19.7 |
Interest expense, net |  | (53.3) |  | (70.4) |  | (152.4) | [1]
Income before taxes |  | 1,014.1 |  | 1,364.8 |  | 1,108.7 |
Depreciation, Amortization, and Depletion |  | 517.7 |  | 456.8 |  | 417.5 |
Capital Expenditures |  | 469.7 |  | 824.2 |  | 605.1 |
Segment, Expenditure, Addition to Long-Lived Assets | [2] | 469.7 |  | 824.2 |  | 605.1 |
Assets |  | 8,681.1 |  | 8,003.8 |  | 7,836.8 |
Trade |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 7,802.4 |  | 8,478.0 |  | 7,730.3 |
Intersegment Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (176.5) |  | (168.2) |  | (152.4) |
Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 7,802.4 |  | 8,478.0 |  | 7,730.3 |
Segment Reconciling Items |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (176.5) |  | (168.2) |  | (152.4) |
Packaging |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 7,135.6 |  | 7,780.7 |  | 7,052.6 |
Operating Income (Loss) |  | 1,074.3 | [3] | 1,423.7 | [4] | 1,306.0 | [5]
Depreciation, Amortization, and Depletion |  | 472.5 |  | 420.2 |  | 381.0 |
Segment, Expenditure, Addition to Long-Lived Assets | [2] | 426.8 |  | 753.5 |  | 562.5 |
Assets |  | 6,903.7 |  | 6,986.5 |  | 6,603.3 |
Packaging | Trade |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 7,116.7 |  | 7,760.7 |  | 7,036.2 |
Packaging | Intersegment Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 18.9 |  | 20.0 |  | 16.4 |
Packaging | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 7,135.6 |  | 7,780.7 |  | 7,052.6 |
Paper |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 595.4 |  | 622.1 |  | 599.7 |
Operating Income (Loss) |  | 118.9 | [6] | 103.0 | [7] | (39.1) | [8]
Depreciation, Amortization, and Depletion |  | 29.6 |  | 26.1 |  | 27.4 |
Segment, Expenditure, Addition to Long-Lived Assets | [2] | 9.7 |  | 14.1 |  | 30.1 |
Assets |  | 384.4 |  | 403.1 |  | 398.9 |
Paper | Trade |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 595.4 |  | 622.1 |  | 599.6 |
Paper | Intersegment Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  |  |  |  |  | 0.1 |
Paper | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 595.4 |  | 622.1 |  | 599.7 |
Corporate and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 71.4 |  | 75.2 |  | 78.0 |
Operating Income (Loss) |  | (118.1) |  | (106.0) |  | (103.7) | [9]
Depreciation, Amortization, and Depletion |  | 15.6 |  | 10.5 |  | 9.1 |
Segment, Expenditure, Addition to Long-Lived Assets | [2] | 33.2 |  | 56.6 |  | 12.5 |
Assets |  | 1,393.0 |  | 614.2 |  | 834.6 |
Corporate and Other | Trade |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 90.3 |  | 95.2 |  | 94.5 |
Corporate and Other | Intersegment Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 157.6 |  | 148.2 |  | 135.9 |
Corporate and Other | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | $ 247.9 |  | $ 243.4 |  | $ 230.4 |
[1] | Includes $58.9 million of costs related to the Company's debt refinancing completed in October 2021, which included a redemption premium and the write-off of the remaining balance of unamortized debt issuance costs.
[2] | Includes “Additions to property, plant, and equipment” and excludes cash used for “Acquisition of business, net of cash acquired” as reported on our Consolidated Statements of Cash Flows.
[3] | Includes $14.4 million of charges related to the closure of corrugated products facilities and design centers, partially offset by a gain on sale of a corrugated products facility.
[4] | Includes the following: • $5.3 million of charges related to the announced discontinuation of production of UFS 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. • $0.7 million of charges consisting of closure costs partially offset by insurance proceeds received for a natural disaster at one of the corrugated products facilities, a gain on sale of assets related to a corrugated products facility, and a favorable lease buyout for a closed corrugated products facility. • $1.0 million of income from a favorable inventory adjustment related to the December 2021 Advance Packaging Corporation acquisition, partially offset by acquisition and integration related costs.
[5] | Includes the following: • $4.3 million of charges related to the announced discontinuation of production of UFS 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. • $2.8 million of income primarily consisting of an adjustment of the required asset retirement obligation related to the 2020 closure of the San Lorenzo, California facility, a gain on sale of corrugated products facilities, and insurance proceeds received for a natural disaster at one of the corrugated products facilities, partially offset by closure costs related to corrugated products facilities. • $0.4 million of charges for acquisition and integration costs related to the December 2021 Advance Packaging Corporation acquisition.
[6] | Includes $11.1 million of charges related to the announced discontinuation of production of UFS 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.
[7] | Includes $8.8 million of charges related to the announced discontinuation of production of UFS 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.
[8] | Includes $9.3 million of charges related to the announced discontinuation of production of UFS 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.
[9] | Includes the following: • $0.8 million of income related to a gain on sale of transportation assets. • $0.5 million of charges for acquisition and integration costs related to the December 2021 Advance Packaging Corporation acquisition. • $0.4 million of charges related to the announced discontinuation of UFS 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.

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