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Segment Information - Selected Financial Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | $ 2,182.4 |  | $ 1,936.0 |  | $ 6,237.2 |  | $ 5,864.5 |
Operating Income (Loss) | 327.1 |  | 258.6 |  | 799.1 |  | 813.6 |
Non-operating pension expense | 1.2 |  | (1.8) |  | 3.4 |  | (5.8) |
Interest expense, net | (9.7) |  | (12.3) |  | (29.7) |  | (42.2) |
Income before taxes | 318.6 |  | 244.5 |  | 772.8 |  | 765.6 |
Trade |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 2,182.4 |  | 1,936.0 |  | 6,237.2 |  | 5,864.5 |
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 2,182.4 |  | 1,936.0 |  | 6,237.2 |  | 5,864.5 |
Material Reconciling Items [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | (51.2) |  | (45.2) |  | (140.5) |  | (130.9) |
Intersegment Eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | (51.2) |  | (45.2) |  | (140.5) |  | (130.9) |
Packaging |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 2,008.7 |  | 1,759.8 |  | 5,715.3 |  | 5,358.7 |
Operating Income (Loss) | 320.7 | [1] | 256.8 | [2] | 804.3 | [1],[3] | 810.5 | [2]
Packaging | Trade |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 1,998.8 | [1] | 1,755.2 | [2] | 5,694.3 | [1],[3] | 5,344.3 | [2]
Packaging | Intersegment |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 9.9 | [1] | 4.6 | [2] | 21.0 | [1],[3] | 14.4 | [2]
Packaging | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 2,008.7 | [1] | 1,759.8 | [2] | 5,715.3 | [1],[3] | 5,358.7 | [2]
Paper |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 159.3 |  | 157.9 |  | 473.2 |  | 451.6 |
Operating Income (Loss) | 38.5 |  | 27.6 | [2] | 94.9 | [3] | 90.8 | [2]
Paper | Trade |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 159.3 |  | 157.9 | [2] | 473.2 | [3] | 451.6 | [2]
Paper | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 159.3 |  | 157.9 | [2] | 473.2 | [3] | 451.6 | [2]
Corporate and Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 14.4 |  | 18.3 |  | 48.7 |  | 54.2 |
Operating Income (Loss) | (32.1) |  | (25.8) |  | (100.1) |  | (87.7) |
Corporate and Other | Trade |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 24.3 |  | 22.9 |  | 69.7 |  | 68.6 |
Corporate and Other | Intersegment |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 41.3 |  | 40.6 |  | 119.5 |  | 116.5 |
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | $ 65.6 |  | $ 63.5 |  | $ 189.2 |  | $ 185.1 |
[1] | The three and nine months ended September 30, 2024 include $0.9 million and $1.0 million, respectively, of charges consisting of closure costs related to corrugated products facilities. For the nine months ended September 30, 2024, these charges were partially offset by income primarily related to a favorable lease buyout for a closed corrugated products facility during the first quarter of 2024.
[2] | The three and nine months ended September 30, 2023 include the following: 1. $2.6 million and $8.2 million, respectively, 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. $0.1 million of income and $13.5 million of charges, respectively, 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.
[3] | The nine months ended September 30, 2024 include $9.7 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.

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