Goodwill and other intangible assets - Changes in Goodwill by Segment (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 1,389,255
Acquisitions	6,014
Divestitures	(54,097)
Measurement period adjustments	1,512
Foreign currency translation	(18,183)
Balance as of December 31, 2021	1,324,501
Consumer Packaging
Goodwill [Roll Forward]
Goodwill, Beginning Balance	581,244
Acquisitions	0
Divestitures	(1,058)
Measurement period adjustments	1,512
Foreign currency translation	(9,282)
Balance as of December 31, 2021	572,416
Industrial Paper Packaging
Goodwill [Roll Forward]
Goodwill, Beginning Balance	369,315
Acquisitions	6,014
Divestitures	0
Measurement period adjustments	0
Foreign currency translation	(7,549)
Balance as of December 31, 2021	367,780
All Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	438,696
Acquisitions	0
Divestitures	(53,039)
Measurement period adjustments	0
Foreign currency translation	(1,352)
Balance as of December 31, 2021	$ 384,305

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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