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Segment Information - Selected Financial Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | $ 2,075.3 |  | $ 1,952.1 |  | $ 4,054.8 |  | $ 3,928.4 |
Operating Income (Loss) | 276.0 |  | 284.4 |  | 472.0 |  | 555.0 |
Non-operating pension expense | 1.1 |  | (2.0) |  | 2.2 |  | (4.0) |
Interest expense, net | (10.4) |  | (14.6) |  | (19.9) |  | (29.9) |
Income before taxes | 266.7 |  | 267.8 |  | 454.3 |  | 521.1 |
Trade |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 2,075.3 |  | 1,952.1 |  | 4,054.8 |  | 3,928.4 |
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 2,075.3 |  | 1,952.1 |  | 4,054.8 |  | 3,928.4 |
Material Reconciling Items [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | (45.1) |  | (42.0) |  | (89.3) |  | (85.8) |
Intersegment Eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | (45.1) |  | (42.0) |  | (89.3) |  | (85.8) |
Packaging |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 1,908.3 |  | 1,790.3 |  | 3,706.5 |  | 3,598.9 |
Operating Income (Loss) | 279.8 | [1] | 285.8 | [2] | 483.6 | [1] | 553.7 | [2]
Packaging | Trade |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 1,902.0 | [1] | 1,785.7 | [2] | 3,695.4 | [1] | 3,589.1 | [2]
Packaging | Intersegment |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 6.3 | [1] | 4.6 | [2] | 11.1 | [1] | 9.8 | [2]
Packaging | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 1,908.3 | [1] | 1,790.3 | [2] | 3,706.5 | [1] | 3,598.9 | [2]
Paper |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 150.1 |  | 142.8 |  | 313.9 |  | 293.7 |
Operating Income (Loss) | 26.7 | [1] | 29.1 | [2] | 56.4 | [1] | 63.2 | [2]
Paper | Trade |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 150.1 | [1] | 142.8 | [2] | 313.9 | [1] | 293.7 | [2]
Paper | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 150.1 | [1] | 142.8 | [2] | 313.9 | [1] | 293.7 | [2]
Corporate and Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 16.9 |  | 19.0 |  | 34.4 |  | 35.8 |
Operating Income (Loss) | (30.5) |  | (30.5) |  | (68.0) |  | (61.9) |
Corporate and Other | Trade |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 23.2 |  | 23.6 |  | 45.5 |  | 45.6 |
Corporate and Other | Intersegment |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | 38.8 |  | 37.4 |  | 78.2 |  | 76.0 |
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net sales | $ 62.0 |  | $ 61.0 |  | $ 123.7 |  | $ 121.6 |
[1] | The three and six months ended June 30, 2024 include the following: 1. $0.6 million of income and $9.7 million of charges, respectively, 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 charges consisting of closure costs related to corrugated products facilities. For the six months ended June 30, 2024, these charges were completely offset by $0.1 million of income primarily related to a favorable lease buyout for a closed corrugated products facility during the first quarter of 2024.
[2] | The three and six months ended June 30, 2023 include the following: 1. $4.4 million and $5.7 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. $3.9 million and $13.6 million, respectively, of charges consisting of closure costs related to corrugated products facilities and design centers.

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