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Segment reporting - Financial Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 29, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Oct. 01, 2023
Jul. 02, 2023
Apr. 02, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]                      
Sales from external customers                 $ 5,001,044 $ 4,952,154 $ 5,384,560
Other sales                 431,107 604,442 620,330
Total sales $ 1,363,276 $ 1,354,652 $ 1,278,801 $ 1,308,636 $ 1,335,735 $ 1,381,130 $ 1,337,589 $ 1,386,972 5,305,365 5,441,426 5,859,327
Cost of sales                 (4,166,132) (4,238,857) (4,634,009)
Segment operating profit                 326,578 589,049 563,355
Other segment disclosures:                      
Equity in earnings of affiliates, net of tax                 9,588 10,347 14,207
Depreciation, depletion and amortization                 374,859 340,988 308,824
Consumer Packaging                      
Segment Reporting Information [Line Items]                      
Sales from external customers                 2,539,874 2,476,219 2,565,783
Industrial Paper Packaging                      
Segment Reporting Information [Line Items]                      
Sales from external customers                 2,461,170 2,475,935 2,818,777
Operating segments                      
Segment Reporting Information [Line Items]                      
Sales from external customers                 4,881,340 4,845,161 5,248,567
Segment operating profit                 566,486 603,679 770,015
Other segment disclosures:                      
Equity in earnings of affiliates, net of tax                 9,588 10,347 14,207
Depreciation, depletion and amortization                 225,504 200,063 175,993
Operating segments | Consumer Packaging                      
Segment Reporting Information [Line Items]                      
Sales from external customers                 2,531,852 2,471,048 2,564,004
Total sales                 2,531,852 2,471,048 2,564,004
Cost of sales                 (2,041,078) (1,999,514) (1,981,621)
Other segment items                 (203,964) (190,943) (142,006)
Segment operating profit                 294,832 285,762 442,156
Other segment disclosures:                      
Equity in earnings of affiliates, net of tax                 365 564 485
Depreciation, depletion and amortization                 109,355 95,340 84,049
Operating segments | Industrial Paper Packaging                      
Segment Reporting Information [Line Items]                      
Sales from external customers                 2,349,488 2,374,113 2,684,563
Total sales                 2,349,488 2,374,113 2,684,563
Cost of sales                 (1,818,324) (1,809,803) (2,109,080)
Other segment items                 (371,192) (348,215) (381,838)
Segment operating profit                 271,654 317,917 327,859
Other segment disclosures:                      
Equity in earnings of affiliates, net of tax                 9,223 9,783 13,722
Depreciation, depletion and amortization                 116,149 104,723 91,944
Intersegment sales                      
Segment Reporting Information [Line Items]                      
Sales from external customers                 119,704 106,993 135,993
Total sales                 (126,786) (115,170) (145,563)
Intersegment sales | Consumer Packaging                      
Segment Reporting Information [Line Items]                      
Sales from external customers                 8,022 5,171 1,779
Intersegment sales | Industrial Paper Packaging                      
Segment Reporting Information [Line Items]                      
Sales from external customers                 $ 111,682 $ 101,822 $ 134,214