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Leases - Summary of Lease Payments Captured in Lease Receivables (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Leases [Abstract] |  |
Short-Term (12 months or less) | $ 5.6 | $ 5.4
Long-Term | 16.2 | 11.9
Total lease receivables (Sales-type and Operating) | $ 21.8 | $ 17.3

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- Definition Sales-Type Lease, Lease Receivable, Current + References No definition available. + Details
Name: | see_SalesTypeLeaseLeaseReceivableCurrent
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales-type Lease, Lease Receivable, Noncurrent + References No definition available. + Details
Name: | see_SalesTypeLeaseLeaseReceivableNoncurrent
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919379-209981 + Details
Name: | us-gaap_SalesTypeLeaseLeaseReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant