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Fair value measurements - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Percentage of postretirement benefit plan assets comprised of pension plan assets (more than) | 96.00%

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- Definition Percentage of postretirement benefit plan assets in company's pension plan assets. + References No definition available. + Details
Name: | son_PercentageOfPostretirementBenefitPlanAssetsInCompanysPensionPlanAssets
Namespace Prefix: | son_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration