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Discontinued operations - Income Statement (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Disposal Group, Including Discontinued Operations [Line Items]
Net income from discontinued operations	$ 13,256	$ 19,817	$ 33,541	$ 29,761	$ 20,724	$ 19,112	$ 30,111	$ 26,310	$ 96,375	$ 96,257	$ 88,570
Net income from discontinued operations attributable to noncontrolling interests									$ (171)	$ (174)	$ (259)
Weighted average common shares outstanding:
Basic (in shares)	98,700	98,683	98,671	98,498	98,349	98,337	98,325	98,167	98,637	98,294	97,991
Diluted (in shares)	98,700	99,267	99,241	99,159	99,164	98,912	98,872	98,615	99,290	98,890	98,732
Net income attributable to discontinued operations:
Basic (usd per share)	$ 0.13	$ 0.20	$ 0.34	$ 0.30	$ 0.21	$ 0.19	$ 0.31	$ 0.27	$ 0.97	$ 0.98	$ 0.90
Diluted (usd per share)	$ 0.13	$ 0.20	$ 0.34	$ 0.30	$ 0.21	$ 0.19	$ 0.30	$ 0.27	$ 0.97	$ 0.97	$ 0.89
Discontinued Operations, Held-for-Sale
Disposal Group, Including Discontinued Operations [Line Items]
Net sales									$ 1,291,461	$ 1,339,866	$ 1,391,225
Cost of sales									1,037,196	1,106,970	1,176,894
Gross profit									254,265	232,896	214,331
Selling, general and administrative expenses									122,488	97,131	97,762
Restructuring/Asset impairment charges									3,740	9,024	4,525
Operating profit									128,037	126,741	112,044
Interest expense									13,396	1,293	790
Interest income									1,668	357	94
Income from discontinued operations before income taxes									116,309	125,805	111,348
Provision for income taxes									19,934	29,548	22,778
Net income from discontinued operations									96,375	96,257	88,570
Net income from discontinued operations attributable to noncontrolling interests									(171)	(174)	(259)
Net income attributable to discontinued operations									$ 96,204	$ 96,083	$ 88,311
Weighted average common shares outstanding:
Basic (in shares)									98,637	98,294	97,991
Diluted (in shares)									99,290	98,890	98,732
Net income attributable to discontinued operations:
Basic (usd per share)									$ 0.97	$ 0.98	$ 0.90
Diluted (usd per share)									$ 0.97	$ 0.97	$ 0.89
Discontinued Operations, Held-for-Sale | Thermoformed and Flexible Packaging business and its Global Trident business
Disposal Group, Including Discontinued Operations [Line Items]
Interest expense									$ 9,528

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