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Segment reporting - Restructuring Asset Impairment and Acquisition Related Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Restructuring, asset impairment and acquisition-related costs $ (184,521) $ (348,583) $ (725,765)
Operating segments | Consumer Packaging      
Segment Reporting Information [Line Items]      
Restructuring, asset impairment and acquisition-related costs (56,237) (138,343) (25,983)
Operating segments | Industrial Paper Packaging      
Segment Reporting Information [Line Items]      
Restructuring, asset impairment and acquisition-related costs 17,064 (40,805) (2,570)
All Other      
Segment Reporting Information [Line Items]      
Restructuring, asset impairment and acquisition-related costs (24,486) (18,800) (23,312)
Corporate      
Segment Reporting Information [Line Items]      
Restructuring, asset impairment and acquisition-related costs $ (120,862) $ (150,635) $ (673,900)