Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2026	Jun. 29, 2025	Jun. 28, 2026	Jun. 29, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 1,885,485	$ 1,910,441	$ 3,561,927	$ 3,619,669
United States
Disaggregation of Revenue [Line Items]
Revenue	877,978	919,703	1,684,041	1,794,801
EMEA
Disaggregation of Revenue [Line Items]
Revenue	815,603	817,709	1,513,677	1,485,315
Canada
Disaggregation of Revenue [Line Items]
Revenue	24,379	27,716	47,079	53,015
APAC
Disaggregation of Revenue [Line Items]
Revenue	70,683	60,602	134,156	121,329
Other
Disaggregation of Revenue [Line Items]
Revenue	96,842	84,711	182,974	165,209
Operating Segments \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	1,241,839	1,227,033	2,338,914	2,293,626
Operating Segments \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	643,646	617,661	1,223,013	1,205,193
Operating Segments \| United States \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	468,040	467,148	909,006	915,182
Operating Segments \| United States \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	409,938	392,259	775,035	769,424
Operating Segments \| EMEA \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	705,379	707,327	1,302,963	1,274,351
Operating Segments \| EMEA \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	110,224	105,276	210,714	200,905
Operating Segments \| Canada \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	1,936	4,404	4,500	8,269
Operating Segments \| Canada \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	22,443	23,312	42,579	44,746
Operating Segments \| APAC \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	32,561	23,675	61,311	48,314
Operating Segments \| APAC \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	38,122	36,582	72,845	72,419
Operating Segments \| Other \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	33,923	24,479	61,134	47,510
Operating Segments \| Other \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	$ 62,919	60,232	$ 121,840	117,699
All Other
Disaggregation of Revenue [Line Items]
Revenue		65,747		120,850
All Other \| United States
Disaggregation of Revenue [Line Items]
Revenue		60,296		110,195
All Other \| EMEA
Disaggregation of Revenue [Line Items]
Revenue		5,106		10,059
All Other \| Canada
Disaggregation of Revenue [Line Items]
Revenue		0		0
All Other \| APAC
Disaggregation of Revenue [Line Items]
Revenue		345		596
All Other \| Other
Disaggregation of Revenue [Line Items]
Revenue		$ 0		$ 0