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Summary of significant accounting policies - Company Held Significant Investment (Details) | Dec. 31, 2022
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RTS Packaging, LLC |
Noncontrolling Interest [Line Items] |
Ownership percentage by join venture | 35.00%
Cascades Conversion, Inc. |
Noncontrolling Interest [Line Items] |
Ownership percentage by join venture | 50.00%
Cascades Sonoco, Inc. |
Noncontrolling Interest [Line Items] |
Ownership percentage by join venture | 50.00%
Showa Products Company Ltd. |
Noncontrolling Interest [Line Items] |
Ownership percentage by join venture | 22.20%
Papertech Energía, S.L. |
Noncontrolling Interest [Line Items] |
Ownership percentage by join venture | 25.00%
Weidenhammer New Packaging, LLC |
Noncontrolling Interest [Line Items] |
Ownership percentage by join 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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