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Goodwill and other intangible assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Goodwill
Changes in the carrying amount of goodwill by segment for the year ended December 31, 2023, are as follows:
Consumer
Packaging
Industrial Paper
Packaging
All Other
Total
Balance as of January 1, 2023$898,625 $394,826 $381,860 $1,675,311 
Acquisitions
15,704 92,657 — 108,361 
    Divestitures— (6,375)— (6,375)
    Measurement period adjustments439 14,644 — 15,083 
    Foreign currency translation5,669 10,654 1,951 18,274 
Balance as of December 31, 2023$920,437 $506,406 $383,811 $1,810,654 
Schedule of other intangible assets
Details at December 31 are as follows:
20232022
Other Intangible Assets, Gross:
Patents$29,304 $29,303 
Customer lists1,282,689 1,092,232 
Trade names41,836 34,220 
Proprietary technology56,857 57,720 
Other6,916 6,721 
Other Intangible Assets, Gross$1,417,602 $1,220,196 
Accumulated Amortization:
Patents$(19,549)$(17,889)
Customer lists(493,778)(417,034)
Trade names(18,845)(15,892)
Proprietary technology(29,013)(25,113)
Other(2,747)(2,670)
Accumulated Amortization$(563,932)$(478,598)
Other Intangible Assets, Net$853,670 $741,598