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Goodwill and other intangible assets (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2024, are as follows:
Consumer
Packaging
Industrial Paper
Packaging
All Other
Total
Balance as of January 1, 2024
$543,598 $506,406 $248,007 $1,298,011 
Acquisitions
1,285,518 — — 1,285,518 
    Divestitures— — (16,559)(16,559)
    Foreign currency translation(21,145)(19,770)(398)(41,313)
Balance as of December 31, 2024
$1,807,971 $486,636 $231,050 $2,525,657 
Schedule of Other Intangible Assets
Details at December 31 are as follows:
20242023
Other Intangible Assets, Gross:
Patents$28,941 $23,970 
Customer lists2,679,372 995,077 
Trade names38,623 27,108 
Proprietary technology226,936 48,657 
Other2,339 6,206 
Total Other Intangible Assets, Gross$2,976,211 $1,101,018 
Accumulated Amortization:
Patents$(15,955)$(14,215)
Customer lists(332,680)(328,895)
Trade names(13,239)(8,327)
Proprietary technology(26,203)(20,813)
Other(1,436)(2,211)
Total Accumulated Amortization$(389,513)$(374,461)
Other Intangible Assets, Net$2,586,698 $726,557