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Summary of significant accounting policies - Company Held Significant Investment (Details) | Dec. 31, 2023
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Cascades Conversion, Inc. |
Noncontrolling Interest [Line Items] |
Ownership percentage by joint venture | 50.00%
Cascades Sonoco, Inc. |
Noncontrolling Interest [Line Items] |
Ownership percentage by joint venture | 50.00%
ISI Robotics, LLC |
Noncontrolling Interest [Line Items] |
Ownership percentage by joint venture | 20.00%
Showa Products Company Ltd. |
Noncontrolling Interest [Line Items] |
Ownership percentage by joint venture | 22.20%
Papertech Energía, S.L. |
Noncontrolling Interest [Line Items] |
Ownership percentage by joint venture | 25.00%
Weidenhammer New Packaging, LLC |
Noncontrolling Interest [Line Items] |
Ownership percentage by joint venture | 40.00%

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
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