Goodwill and Other Intangible Assets - Changes in Goodwill by Segment (Details) $ in Thousands	6 Months Ended
	Jun. 28, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill at December 31, 2019	$ 1,429,346	[1]
2020 Acquisitions	1,050
Foreign currency translation	(10,063)
Measurement period adjustments	3,379
Goodwill at June 28, 2020	1,423,712
Consumer Packaging
Goodwill [Roll Forward]
Goodwill at December 31, 2019	691,243
2020 Acquisitions	0
Foreign currency translation	(6,398)
Measurement period adjustments	2,763
Goodwill at June 28, 2020	687,608
Display and Packaging
Goodwill [Roll Forward]
Goodwill at December 31, 2019	203,414
2020 Acquisitions	0
Foreign currency translation	0
Measurement period adjustments	0
Goodwill at June 28, 2020	203,414
Paper and Industrial Converted Products
Goodwill [Roll Forward]
Goodwill at December 31, 2019	303,041
2020 Acquisitions	1,050
Foreign currency translation	(3,138)
Measurement period adjustments	616
Goodwill at June 28, 2020	301,569
Protective Solutions
Goodwill [Roll Forward]
Goodwill at December 31, 2019	231,648
2020 Acquisitions	0
Foreign currency translation	(527)
Measurement period adjustments	0
Goodwill at June 28, 2020	$ 231,121

[1] The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.