Goodwill and other intangible assets - Changes in Goodwill by Segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Goodwill [Roll Forward]
Balance as of January 1, 2022	$ 1,324,501
Acquisitions	400,571
Measurement period adjustments	(28,987)
Foreign currency translation	(20,774)
Balance as of December 31, 2022	1,675,311
Consumer Packaging
Goodwill [Roll Forward]
Balance as of January 1, 2022	572,416
Acquisitions	366,098
Measurement period adjustments	(28,987)
Foreign currency translation	(10,902)
Balance as of December 31, 2022	898,625
Industrial Paper Packaging
Goodwill [Roll Forward]
Balance as of January 1, 2022	367,780
Acquisitions	34,473
Measurement period adjustments	0
Foreign currency translation	(7,427)
Balance as of December 31, 2022	394,826
All Other
Goodwill [Roll Forward]
Balance as of January 1, 2022	384,305
Acquisitions	0
Measurement period adjustments	0
Foreign currency translation	(2,445)
Balance as of December 31, 2022	$ 381,860