Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 1,364,762	$ 1,324,634	$ 4,035,322	$ 3,737,632
Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	600,154		1,786,068
Consumer Packaging | Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	368,709		1,101,125
Consumer Packaging | Products transferred over time
Disaggregation of Revenue [Line Items]
Revenue	231,445		684,943
Consumer Packaging | United States
Disaggregation of Revenue [Line Items]
Revenue	431,216		1,275,775
Consumer Packaging | Europe
Disaggregation of Revenue [Line Items]
Revenue	101,848		310,865
Consumer Packaging | Canada
Disaggregation of Revenue [Line Items]
Revenue	29,427		87,728
Consumer Packaging | Other
Disaggregation of Revenue [Line Items]
Revenue	37,663		111,700
Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue	165,164		451,082
Display and Packaging | Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	124,437		325,313
Display and Packaging | Products transferred over time
Disaggregation of Revenue [Line Items]
Revenue	40,727		125,769
Display and Packaging | United States
Disaggregation of Revenue [Line Items]
Revenue	80,696		223,760
Display and Packaging | Europe
Disaggregation of Revenue [Line Items]
Revenue	82,906		221,228
Display and Packaging | Canada
Disaggregation of Revenue [Line Items]
Revenue	0		0
Display and Packaging | Other
Disaggregation of Revenue [Line Items]
Revenue	1,562		6,094
Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue	463,748		1,398,538
Paper and Industrial Converted Products | Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	438,599		1,332,266
Paper and Industrial Converted Products | Products transferred over time
Disaggregation of Revenue [Line Items]
Revenue	25,149		66,272
Paper and Industrial Converted Products | United States
Disaggregation of Revenue [Line Items]
Revenue	274,966		820,429
Paper and Industrial Converted Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	84,313		267,566
Paper and Industrial Converted Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	33,233		99,868
Paper and Industrial Converted Products | Other
Disaggregation of Revenue [Line Items]
Revenue	71,236		210,675
Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue	135,696		399,634
Protective Solutions | Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	117,608		339,043
Protective Solutions | Products transferred over time
Disaggregation of Revenue [Line Items]
Revenue	18,088		60,591
Protective Solutions | United States
Disaggregation of Revenue [Line Items]
Revenue	91,093		313,341
Protective Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenue	6,721		20,326
Protective Solutions | Canada
Disaggregation of Revenue [Line Items]
Revenue	0		0
Protective Solutions | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 37,882		$ 65,967