Amount of borrowing outstanding under accounts receivable securitization program.

No definition available.

Name:	see_AmountOfBorrowingOutstandingUnderAccountsReceivableSecuritizationProgram
Namespace Prefix:	see_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Level Of Eligible Assets Available Under Accounts Receivable Securitization Program

+ References

No definition available.

+ Details

Name:	see_LevelOfEligibleAssetsAvailableUnderAccountsReceivableSecuritizationProgram
Namespace Prefix:	see_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of banks involved in sale of fraction of accounts receivable.

+ References

No definition available.

+ Details

Name:	see_NumberOfBanksInvolvedInSaleOfFractionOfAccountsReceivable
Namespace Prefix:	see_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Purchase limit for receivable interests under accounts receivable securitization program.

+ References

No definition available.

+ Details

Name:	see_PurchaseLimitForReceivableInterestsUnderAccountsReceivableSecuritizationProgram
Namespace Prefix:	see_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.9)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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_QualitativeAndQuantitativeInformationTransferorsContinuingInvolvementLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719

+ Details

Name:	us-gaap_SecuritizedAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=see_UnitedStatesAccountsReceivableSecuritizationProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=see_EuropeanAccountsReceivableSecuritizationProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=us-gaap_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Accounts Receivable Securitization Programs (Details)	3 Months Ended		6 Months Ended
Accounts Receivable Securitization Programs (Details)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) bank	Jun. 30, 2017 USD ($)	Jun. 30, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Interest paid (less than)	$ 44,500,000	$ 47,700,000	$ 86,500,000	$ 94,300,000
U.S. Accounts Receivable Securitization Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Interest paid (less than)	1,000,000	$ 1,000,000	$ 1,000,000	$ 0
U.S. Accounts Receivable Securitization Program \| U.S. Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Number of banks involved in sale of fractional ownership interest of accounts receivable \| bank			2
Level of eligible assets available under accounts receivable securitization program			$ 60,000,000
Amount available for accounts receivable securitization program	60,000,000		60,000,000
Amount utilized under accounts receivable securitization program	0		0			$ 0
U.S. Accounts Receivable Securitization Program \| Maximum \| U.S. Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Maximum purchase limit for receivable interests under accounts receivable securitization program	60,000,000		60,000,000
European Accounts Receivable Securitization Program \| European Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Amount available for accounts receivable securitization program	86,800,000		86,800,000		€ 75,100,000
Amount utilized under accounts receivable securitization program	62,400,000		62,400,000		54,000,000		€ 0
European Accounts Receivable Securitization Program \| Maximum \| European Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Maximum purchase limit for receivable interests under accounts receivable securitization program	$ 92,600,000		$ 92,600,000		€ 80,000,000