Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 1,308,850	$ 1,353,931	$ 1,359,721	$ 1,351,705	$ 1,355,616	$ 1,364,762	$ 1,366,373	$ 1,304,187	$ 5,374,207	$ 5,390,938	$ 5,036,650
Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue									2,333,386	2,359,999
Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue									554,125	592,309
Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue									1,974,739	1,910,953
Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue									511,957	527,677
United States
Disaggregation of Revenue [Line Items]
Revenue									3,408,459	3,490,369	3,263,975
United States | Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue									1,659,071	1,676,204
United States | Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue									246,735	290,295
United States | Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue									1,095,437	1,108,735
United States | Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue									407,216	415,135
Europe
Disaggregation of Revenue [Line Items]
Revenue									1,078,766	1,092,654	981,178
Europe | Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue									407,759	418,129
Europe | Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue									301,866	294,156
Europe | Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue									346,102	354,705
Europe | Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue									23,039	25,664
Canada
Disaggregation of Revenue [Line Items]
Revenue									226,049	246,208	$ 245,992
Canada | Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue									108,848	115,183
Canada | Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue									0	0
Canada | Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue									117,201	131,025
Canada | Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue									0	0
Asia
Disaggregation of Revenue [Line Items]
Revenue									350,259	251,299
Asia | Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue									70,504	69,242
Asia | Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue									0	0
Asia | Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue									277,385	178,509
Asia | Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue									2,370	3,548
All other
Disaggregation of Revenue [Line Items]
Revenue									310,674	310,408
All other | Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue									87,204	81,241
All other | Display and Packaging
Disaggregation of Revenue [Line Items]
Revenue									5,524	7,858
All other | Paper and Industrial Converted Products
Disaggregation of Revenue [Line Items]
Revenue									138,614	137,979
All other | Protective Solutions
Disaggregation of Revenue [Line Items]
Revenue									$ 79,332	$ 83,330