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Segments - Schedule of Restructuring charges by segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |
Total Company restructuring charges | $ 39.9 | $ 57.8 | $ 15.6
Food |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Company restructuring charges | 25.1 | 31.3 | 8.2
Protective |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Company restructuring charges | $ 14.8 | $ 26.5 | $ 7.4

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- Definition Restructuring and other charges excluding amounts related to foreign subsidiaries. + References No definition available. + Details
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Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=see_FoodSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=see_ProtectiveSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |