Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 1,312,314	$ 1,353,931	$ 3,861,095	$ 4,065,357
United States
Disaggregation of Revenue [Line Items]
Revenue	848,582	859,245	2,528,385	2,582,892
Europe
Disaggregation of Revenue [Line Items]
Revenue	275,896	273,041	775,906	812,192
Canada
Disaggregation of Revenue [Line Items]
Revenue	39,881	53,527	139,030	172,402
Asia
Disaggregation of Revenue [Line Items]
Revenue	81,320	89,523	224,574	262,965
Other
Disaggregation of Revenue [Line Items]
Revenue	66,635	78,595	193,200	234,906
Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	583,736	581,368	1,786,774	1,773,834
Consumer Packaging | United States
Disaggregation of Revenue [Line Items]
Revenue	414,070	415,567	1,284,095	1,268,863
Consumer Packaging | Europe
Disaggregation of Revenue [Line Items]
Revenue	107,849	99,276	313,199	306,495
Consumer Packaging | Canada
Disaggregation of Revenue [Line Items]
Revenue	22,131	26,567	74,708	82,706
Consumer Packaging | Asia
Disaggregation of Revenue [Line Items]
Revenue	19,710	17,714	53,993	51,072
Consumer Packaging | Other
Disaggregation of Revenue [Line Items]
Revenue	19,976	22,244	60,779	64,698
Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue	137,610	145,016	366,269	417,403
Display and Packaging | United States
Disaggregation of Revenue [Line Items]
Revenue	53,296	59,688	156,809	187,347
Display and Packaging | Europe
Disaggregation of Revenue [Line Items]
Revenue	84,314	83,888	209,460	225,695
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	1,440	0	4,361
Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue	459,312	495,829	1,368,734	1,483,194
Paper and Industrial Converted Products | United States
Disaggregation of Revenue [Line Items]
Revenue	272,810	279,908	808,810	817,364
Paper and Industrial Converted Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	78,780	83,421	237,599	262,084
Paper and Industrial Converted Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	17,750	26,960	64,322	89,696
Paper and Industrial Converted Products | Asia
Disaggregation of Revenue [Line Items]
Revenue	61,463	71,313	170,046	209,961
Paper and Industrial Converted Products | Other
Disaggregation of Revenue [Line Items]
Revenue	28,509	34,227	87,957	104,089
Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue	131,656	131,718	339,318	390,926
Protective Solutions | United States
Disaggregation of Revenue [Line Items]
Revenue	108,406	104,082	278,671	309,318
Protective Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenue	4,953	6,456	15,648	17,918
Protective Solutions | Canada
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Protective Solutions | Asia
Disaggregation of Revenue [Line Items]
Revenue	147	496	535	1,932
Protective Solutions | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 18,150	$ 20,684	$ 44,464	$ 61,758