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Restructuring and asset impairment - Schedule of Restructuring and Restructuring-Related Asset Impairment Expenses by Type Incurred and by Reportable Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and restructuring-related asset impairment charges | $ 65,370 | $ 47,909 | $ 42,290
Other asset impairments | 0 | 0 | 10,095
Restructuring/Asset impairment charges | 65,370 | 47,909 | 52,385
Operating segments | Consumer Packaging |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and restructuring-related asset impairment charges | 19,259 | 4,111 | 8,207
Operating segments | Industrial Paper Packaging |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and restructuring-related asset impairment charges | 33,923 | 38,754 | 15,598
Total Reportable Segments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and restructuring-related asset impairment charges | 1,434 | 2,547 | (44)
Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and restructuring-related asset impairment charges | 10,754 | 2,497 | 18,529
Severance and Termination Benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and restructuring-related asset impairment charges | 37,307 | 15,543 | 13,808
Restructuring/Asset impairment charges | 37,307 | 15,543 |
Asset Impairment/Disposal of Assets |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and restructuring-related asset impairment charges | 15,719 | 24,415 | 9,182
Restructuring/Asset impairment charges | 15,719 | 24,415 |
Other Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and restructuring-related asset impairment charges | 12,344 | 7,951 | $ 19,300
Restructuring/Asset impairment charges | $ 12,344 | $ 7,951 |

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