Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 1,245,485	$ 1,359,721	$ 2,548,781	$ 2,711,426
United States
Disaggregation of Revenue [Line Items]
Revenue	829,305	871,941	1,679,803	1,723,647
Europe
Disaggregation of Revenue [Line Items]
Revenue	242,516	264,124	500,010	539,151
Canada
Disaggregation of Revenue [Line Items]
Revenue	47,727	58,742	99,149	118,875
Asia
Disaggregation of Revenue [Line Items]
Revenue	70,730	87,549	143,254	173,442
Other
Disaggregation of Revenue [Line Items]
Revenue	55,207	77,365	126,565	156,311
Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	614,621	602,750	1,203,038	1,192,466
Consumer Packaging | United States
Disaggregation of Revenue [Line Items]
Revenue	448,546	436,896	870,025	853,296
Consumer Packaging | Europe
Disaggregation of Revenue [Line Items]
Revenue	102,327	99,007	205,350	207,219
Consumer Packaging | Canada
Disaggregation of Revenue [Line Items]
Revenue	26,732	28,839	52,577	56,139
Consumer Packaging | Asia
Disaggregation of Revenue [Line Items]
Revenue	17,745	17,445	34,283	33,358
Consumer Packaging | Other
Disaggregation of Revenue [Line Items]
Revenue	19,271	20,563	40,803	42,454
Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue	107,303	134,833	228,659	272,387
Display and Packaging | United States
Disaggregation of Revenue [Line Items]
Revenue	47,804	62,097	103,513	127,659
Display and Packaging | Europe
Disaggregation of Revenue [Line Items]
Revenue	59,499	71,564	125,146	141,807
Display and Packaging | Canada
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Display and Packaging | Asia
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Display and Packaging | Other
Disaggregation of Revenue [Line Items]
Revenue	0	1,172	0	2,921
Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue	434,452	491,328	909,422	987,365
Paper and Industrial Converted Products | United States
Disaggregation of Revenue [Line Items]
Revenue	259,178	268,890	536,000	537,456
Paper and Industrial Converted Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	75,279	87,958	158,819	178,663
Paper and Industrial Converted Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	20,995	29,903	46,572	62,736
Paper and Industrial Converted Products | Asia
Disaggregation of Revenue [Line Items]
Revenue	52,799	69,588	108,583	138,648
Paper and Industrial Converted Products | Other
Disaggregation of Revenue [Line Items]
Revenue	26,201	34,989	59,448	69,862
Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue	89,109	130,810	207,662	259,208
Protective Solutions | United States
Disaggregation of Revenue [Line Items]
Revenue	73,777	104,058	170,265	205,236
Protective Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenue	5,411	5,595	10,695	11,462
Protective Solutions | Canada
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Protective Solutions | Asia
Disaggregation of Revenue [Line Items]
Revenue	186	516	388	1,436
Protective Solutions | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 9,735	$ 20,641	$ 26,314	$ 41,074