Goodwill and Other Intangible Assets - Changes in Goodwill by Segment (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,241,875	[1]
2018 Acquisitions	47,193
Foreign currency translation	(12,208)
Other	8,508
Goodwill, ending balance	1,285,368
Consumer Packaging
Goodwill [Roll Forward]
Goodwill, beginning balance	572,716
2018 Acquisitions	47,193
Foreign currency translation	(7,221)
Other	8,508
Goodwill, ending balance	621,196
Display and Packaging
Goodwill [Roll Forward]
Goodwill, beginning balance	203,414
2018 Acquisitions	0
Foreign currency translation	0
Other	0
Goodwill, ending balance	203,414
Paper and Industrial Converted Products
Goodwill [Roll Forward]
Goodwill, beginning balance	233,778
2018 Acquisitions	0
Foreign currency translation	(4,654)
Other	0
Goodwill, ending balance	229,124
Protective Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	231,967
2018 Acquisitions	0
Foreign currency translation	(333)
Other	0
Goodwill, ending balance	$ 231,634

[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.