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Segment Reporting - Segment Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,353,304	$ 1,303,296
Operating profit	120,309	130,103
Restructuring/Asset impairment charges	(6,846)	(12,599)
Other, net	(12,512)	(1,210)
Operating Segments | Consumer Packaging
Segment Reporting Information [Line Items]
Net sales	582,753	540,569
Operating profit	75,610	63,756
Operating Segments | Industrial Paper Packaging
Segment Reporting Information [Line Items]
Net sales	565,397	502,491
Operating profit	50,186	59,601
Operating Segments | All Other
Segment Reporting Information [Line Items]
Net sales	205,154	260,236
Operating profit	13,871	20,555
Intersegment Sales
Segment Reporting Information [Line Items]
Net sales	31,574	28,290
Intersegment Sales | Consumer Packaging
Segment Reporting Information [Line Items]
Net sales	1,653	1,106
Intersegment Sales | Industrial Paper Packaging
Segment Reporting Information [Line Items]
Net sales	26,896	24,502
Intersegment Sales | All Other
Segment Reporting Information [Line Items]
Net sales	$ 3,025	$ 2,682

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