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Segment Reporting - Schedule of Segment Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Apr. 02, 2023
Segment Reporting Information [Line Items] |  |
Net sales | $ 1,637,543 | $ 1,729,783
Operating profit | 112,453 | 229,648
Restructuring/Asset impairment charges | (31,618) | (28,814)
Amortization of acquisition intangibles | (22,939) | (21,164)
Gains from divestiture of business and other assets | 0 | 72,010
Acquisition, integration and divestiture-related costs | (5,661) | (5,188)
Changes in LIFO inventory reserves | (431) | 5,425
Derivative gains/(losses) | 286 | (6,085)
Other operating (charges)/income, net(3) | (3,180) | 43
Non-operating pension costs | (3,295) | (3,658)
Interest expense | (31,220) | (34,232)
Interest income | 3,558 | 1,562
Income before income taxes | 81,496 | 193,320
Intersegment sales |  |
Segment Reporting Information [Line Items] |  |
Net sales | 33,753 | 43,516
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,503,637 | 1,573,863
Operating profit | 158,871 | 190,861
Operating Segments | Intersegment sales |  |
Segment Reporting Information [Line Items] |  |
Net sales | 31,962 | 40,727
Operating Segments | Consumer Packaging |  |
Segment Reporting Information [Line Items] |  |
Net sales | 910,577 | 958,008
Operating profit | 93,027 | 96,494
Operating Segments | Consumer Packaging | Intersegment sales |  |
Segment Reporting Information [Line Items] |  |
Net sales | 3,545 | 2,007
Operating Segments | Industrial Paper Packaging |  |
Segment Reporting Information [Line Items] |  |
Net sales | 593,060 | 615,855
Operating profit | 65,844 | 94,367
Operating Segments | Industrial Paper Packaging | Intersegment sales |  |
Segment Reporting Information [Line Items] |  |
Net sales | 28,417 | 38,720
All Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 133,906 | 155,920
Operating profit | 17,125 | 22,560
All Other | Intersegment sales |  |
Segment Reporting Information [Line Items] |  |
Net sales | $ 1,791 | $ 2,789

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