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Segment Information - Selected Financial Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Net sales | $ 1,979.5 | $ 1,976.3
Operating Income (Loss) | 196.0 | 270.7
Non-operating pension expense | 1.1 | (2.0)
Interest expense, net | (9.6) | (15.4)
Income before taxes | 187.5 | 253.3
Trade |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,979.5 | 1,976.3
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,979.5 | 1,976.3
Segment Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Net sales | (44.2) | (43.7)
Intersegment Eliminations |  |
Segment Reporting Information [Line Items] |  |
Net sales | (44.2) | (43.7)
Packaging |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,798.3 | 1,808.6
Operating Income (Loss) | 203.8 | 268.0
Packaging | Trade |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,793.5 | 1,803.5
Packaging | Intersegment |  |
Segment Reporting Information [Line Items] |  |
Net sales | 4.8 | 5.1
Packaging | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,798.3 | 1,808.6
Paper |  |
Segment Reporting Information [Line Items] |  |
Net sales | 163.8 | 150.9
Operating Income (Loss) | 29.7 | 34.1
Paper | Trade |  |
Segment Reporting Information [Line Items] |  |
Net sales | 163.8 | 150.9
Paper | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net sales | 163.8 | 150.9
Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 17.4 | 16.8
Operating Income (Loss) | (37.5) | (31.4)
Corporate and Other | Trade |  |
Segment Reporting Information [Line Items] |  |
Net sales | 22.2 | 21.9
Corporate and Other | Intersegment |  |
Segment Reporting Information [Line Items] |  |
Net sales | 39.4 | 38.6
Corporate and Other | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net sales | $ 61.6 | $ 60.5

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