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Restructuring and asset impairment - Total Restructuring and Asset Impairment Charges Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring and restructuring-related asset impairment charges $ 56,933 $ 46,815 $ 9,176
Other asset impairments 0 10,095 5,034
Restructuring/Asset impairment charges 56,933 56,910 14,210
Consumer Packaging      
Restructuring Cost and Reserve [Line Items]      
Other asset impairments   930  
Operating segments | Consumer Packaging      
Restructuring Cost and Reserve [Line Items]      
Restructuring and restructuring-related asset impairment charges 8,059 12,433 3,427
Operating segments | Industrial Paper Packaging      
Restructuring Cost and Reserve [Line Items]      
Restructuring and restructuring-related asset impairment charges 38,754 16,019 (1,642)
All Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring and restructuring-related asset impairment charges 7,623 (166) 2,969
Other asset impairments   9,165  
Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring and restructuring-related asset impairment charges 2,497 18,529 4,422
Severance and Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring and restructuring-related asset impairment charges 26,631 17,983 13,097
Asset Impairment/Disposal of Assets      
Restructuring Cost and Reserve [Line Items]      
Restructuring and restructuring-related asset impairment charges 19,603 9,442 (9,116)
Other Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and restructuring-related asset impairment charges $ 10,699 $ 19,390 $ 5,195