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Goodwill and other intangible assets - Changes in Goodwill by Segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Goodwill [Roll Forward]
Balance as of January 1, 2023	$ 1,675,311
Acquisitions	108,361
Divestitures	(6,375)
Measurement period adjustments	15,083
Foreign currency translation	18,274
Balance as of December 31, 2023	1,810,654
All Other
Goodwill [Roll Forward]
Balance as of January 1, 2023	381,860
Acquisitions	0
Divestitures	0
Measurement period adjustments	0
Foreign currency translation	1,951
Balance as of December 31, 2023	383,811
Consumer Packaging | Operating segments
Goodwill [Roll Forward]
Balance as of January 1, 2023	898,625
Acquisitions	15,704
Divestitures	0
Measurement period adjustments	439
Foreign currency translation	5,669
Balance as of December 31, 2023	920,437
Industrial Paper Packaging | Operating segments
Goodwill [Roll Forward]
Balance as of January 1, 2023	394,826
Acquisitions	92,657
Divestitures	(6,375)
Measurement period adjustments	14,644
Foreign currency translation	10,654
Balance as of December 31, 2023	$ 506,406

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