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Summary of significant accounting policies - Company Held Significant Investment (Details)	Dec. 31, 2024
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	26.40%
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%

X

- 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

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- Definition

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+ References

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