Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 1,910,441	$ 1,278,801	$ 3,619,669	$ 2,587,437
United States
Disaggregation of Revenue [Line Items]
Revenue	919,703	872,437	1,794,801	1,758,963
Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenue	817,709	212,599	1,485,315	429,825
Canada
Disaggregation of Revenue [Line Items]
Revenue	27,716	30,035	53,015	58,709
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	60,602	77,586	121,329	159,352
Other
Disaggregation of Revenue [Line Items]
Revenue	84,711	86,144	165,209	180,588
Operating Segments \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	1,227,033	583,051	2,293,626	1,164,721
Operating Segments \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	588,239	600,770	1,145,948	1,193,830
Operating Segments \| United States \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	467,148	429,490	915,182	852,082
Operating Segments \| United States \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	373,341	363,215	730,927	717,581
Operating Segments \| Europe, Middle East and Africa (EMEA) \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	707,327	101,543	1,274,351	206,679
Operating Segments \| Europe, Middle East and Africa (EMEA) \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	95,032	96,428	181,141	194,128
Operating Segments \| Canada \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	4,404	4,620	8,269	8,523
Operating Segments \| Canada \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	23,312	25,415	44,746	50,186
Operating Segments \| Asia Pacific \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	23,675	23,290	48,314	47,754
Operating Segments \| Asia Pacific \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	36,582	53,937	72,419	110,886
Operating Segments \| Other \| Consumer Packaging
Disaggregation of Revenue [Line Items]
Revenue	24,479	24,108	47,510	49,683
Operating Segments \| Other \| Industrial Paper Packaging
Disaggregation of Revenue [Line Items]
Revenue	59,972	61,775	116,715	121,049
All Other
Disaggregation of Revenue [Line Items]
Revenue	95,169	94,980	180,095	228,886
All Other \| United States
Disaggregation of Revenue [Line Items]
Revenue	79,214	79,732	148,692	189,300
All Other \| Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenue	15,350	14,628	29,823	29,018
All Other \| Canada
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
All Other \| Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	345	359	596	712
All Other \| Other
Disaggregation of Revenue [Line Items]
Revenue	$ 260	$ 261	$ 984	$ 9,856