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Summary of significant accounting policies - Company Held Significant Investment (Details)	Dec. 31, 2021
RTS Packaging JVCO
Noncontrolling Interest [Line Items]
Ownership interest (percent)	35.00%
Cascades Conversion, Inc.
Noncontrolling Interest [Line Items]
Ownership interest (percent)	50.00%
Cascades Sonoco, Inc.
Noncontrolling Interest [Line Items]
Ownership interest (percent)	50.00%
Showa Products Company Ltd.
Noncontrolling Interest [Line Items]
Ownership interest (percent)	22.20%
Papertech Energía, S.L.
Noncontrolling Interest [Line Items]
Ownership interest (percent)	25.00%
Weidenhammer New Packaging, LLC
Noncontrolling Interest [Line Items]
Ownership interest (percent)	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://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 http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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