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Segment Reporting - Segment Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,382,754	$ 1,245,485	$ 2,736,058	$ 2,548,781
Operating profit	135,291	103,727	255,600	233,830
Restructuring/Asset impairment income/(charges)	1,445	(22,885)	(5,401)	(35,484)
Other non-base income/(charges), net	5,236	56	(7,276)	(1,154)
Consumer Packaging
Segment Reporting Information [Line Items]
Net sales	597,803	573,166	1,180,556	1,113,735
Industrial Paper Packaging
Segment Reporting Information [Line Items]
Net sales	608,532	455,026	1,173,929	957,517
All Other
Segment Reporting Information [Line Items]
Net sales	176,419	217,293	381,573	477,529
Operating Segments | Consumer Packaging
Segment Reporting Information [Line Items]
Net sales	597,803	573,166	1,180,556	1,113,735
Operating profit	59,813	84,449	135,423	148,205
Operating Segments | Industrial Paper Packaging
Segment Reporting Information [Line Items]
Net sales	608,532	455,026	1,173,929	957,517
Operating profit	57,885	33,235	108,071	92,836
Operating Segments | All Other
Segment Reporting Information [Line Items]
Net sales	176,419	217,293	381,573	477,529
Operating profit	10,912	8,872	24,783	29,427
Intersegment Sales
Segment Reporting Information [Line Items]
Net sales	31,039	27,136	62,613	55,426
Intersegment Sales | Consumer Packaging
Segment Reporting Information [Line Items]
Net sales	1,199	1,154	2,852	2,260
Intersegment Sales | Industrial Paper Packaging
Segment Reporting Information [Line Items]
Net sales	27,700	24,508	54,596	49,010
Intersegment Sales | All Other
Segment Reporting Information [Line Items]
Net sales	$ 2,140	$ 1,474	$ 5,165	$ 4,156

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